58results about How to "Increase water production ratio" patented technology

A seawater desalinating system with solar heat pump is composed of the solar heat collecting and circulating unit consisting of solar heat collector, heat exchanger and circulating pump, the heat pump circulating unit consisting of compressor, condenser, expansion valve and evaporator, the flash evaporator consisting of heat exchanger and condenser, the seawater pipe, vapor pipe and vacuum pipe of flash evaporator are respectively connected via multi-effect distiller to seawater taking pipe, concentrated seawater condensing pipe, fresh water pipe and vacuum pipe, and the seawater condensing pipe and fresh water pipe are connected via evaporator to pump. Its advantages are high fresh water output and high utilization rate of energy.

A heat return type multi-stage flash evaporation apparatus for desalinating seawater is composed of the circulating saline pipeline in heat releasing segment, mutually communicated several flash evaporation chambers in heat-recovering segment and heat-releasing segment respectively, and the circulating saline pipeline with condensing tube and saline heater in the heat-recovering segment. Their connection scheme is also disclosed.

The invention relates to a multi-effect membrane distillation device with efficient internal heat reclamation function and a method. The middle part of a membrane shell is provided with a cavity, two ends of the membrane shell are provided with an inlet and an outlet respectively, hollow fibrous membranes and hollow fiber pipes arranged uniformly are arranged in the cavity of the membrane shell, joints at two ends of the hollow fibrous membranes and the hollow fiber pipes are connected with the inlet and the outlet respectively, the lower end of the membrane shell is provided with a distillate outlet, and an external heat exchanger is connected in series between the inlet and the outlet of the water return end of a membrane assembly. The device has compact structure, simple and mild operating condition, low energy consumption and high water making rate, and can be used for small-scale dispersed implementation and integrated application; the method can be used in the fields of sea water desalinization, bitter water desalinization, concentration treatment of aqueous solution of nonvolatile or semi-volatile solutes, environmental protection and the like; and particularly when the method is used for concentration of aqueous solution of nonvolatile and semi-volatile solutes such as sodium chloride, ammonium sulfate, ammonium nitrate, sodium nitrate, sodium carbonate, sodium hydroxide, sulfuric acid, hydrochloric acid, glucose, xylitol, urea, glycerol, ethylene glycol, lactic acid, glyoxylic acid, dimethyl sulfoxide, sulfolane and the like, normal pressure steam or hot water is used as a heat source, and the highest water making rate can reach 13.7.

The invention discloses a multi-effect membrane distillation-multistage flash evaporation seawater desalination system. The multi-effect membrane distillation-multistage flash evaporation seawater desalination system comprises a steam jetting pump (9), a concentrated water discharge pump (1), a material liquid circulating pump (2), a vacuum pump (3), a product water pump (4), N membrane assemblies, N freshwater flash evaporation tanks, N+1 heat exchange assemblies and N-1 concentrated water flash evaporation tanks, wherein the plurality of membrane assemblies and heat exchange assemblies are connected in series to form 'multi-effect' distillation in the term of the traditional distillation; the plurality of freshwater flash evaporation tanks and the plurality of concentrated water flash evaporation tanks are connected in series to form 'multistage' flash evaporation in the term of traditional distillation; the multi-effect membrane distillation process and the multistage flash evaporation process are coupled, secondary steam generated by membrane distillation is used for heating material liquid seawater, high-temperature concentrated seawater and product water which are discharged by membrane distillation are subjected to flash evaporation stage by stage, and the flash-off steam is used for heating material liquid seawater, so gradient utilization of energy and double concentration of the material liquid are realized, vaporized latent heat is effectively recovered, and heat efficiency, water making ratio and concentration ratio of a system are increased.

The invention relates to a sectional multiple-effect distillation seawater desalination process by supplementing preheated seawater via a water-water heat exchanger, and belongs to the technology field of multiple-effect distillation seawater desalination. The process comprises the steps of dividing an evaporator into a plurality of sections, leading out the final-effect condensed products fresh water and concentrated seawater in a high-temperature section, and supplementing preheated seawater via a water-water heat exchanger to reduce the degree of supercooling of the supplemented water entering into the high-temperature section of the evaporator, so as to solve the key restriction factor troubling the MED system design, and effectively improve the heat economical efficiency of the system. The final-effect secondary steam from the high-temperature section of the evaporator is introduced into an adjacent low temperature section of the evaporator as a heating steam, so as to recycle the latent heat of the steam. Therefore, the inventive process can adopt more effects, larger operating temperature range, and higher water generation ratio.

The invention provides a heat pump-double-effect membrane distillation apparatus and distillation method, belonging to the technical field of membrane distillation. The apparatus comprises a hydrophobic membrane module specially used for membrane distillation, heat preservation cotton arranged out of the membrane module, a water pump used for providing power for circulation of a membrane distillation system, a heat exchanger used for heat exchange between liquid located a cold side of a first-effect membrane module and at a hot side of a second-effect membrane module, an evaporator used for absorbing waste heat of liquid located at a cold side of the second-effect membrane module, a condenser used for heating liquid located a hot side of the first-effect membrane module, a compressor used for converting absorbed low-level heat into high-level heat and a throttle valve exerting throttling and pressure-reducing effect on a circulating working medium and used for adjusting the flow of the circulating working medium entering the evaporator. The whole multiple-effect heat pump-membrane distillation system has the advantages of high heat recovery efficiency, simple equipment, a high integrated level, conservation of energy, convenience in operation, etc.

The invention discloses a solar line focusing-wind energy synergetic ultrasonic sea water desalting device and method. The device comprises an air pressurizing and energy storing device of a wind turbine and a heat storage and assistant heating device. The air pressurizing and energy storing device of the wind turbine and the heat storage and assistant heating device are respectively connected with an atomizing and humidifying device through pipelines. The atomizing and humidifying device is connected with an energy circulating device. The heat storage and assistant heating device is connected with a fixed strip-type mirror solar focuser. By adopting synergetic operation of wind energy and solar energy, a hydrodynamic ultrasonic fog generator accelerates evaporation of sea water in an evaporation chamber. The whole system is almost driven by novel energy sources. The device disclosed by the invention has good water yield and requires very low energy consumption, and can operate independently in seasons with wind but without sunlight and seasons with sunlight but without wind. The device is a good sea water desalting choice for remove areas and has good economic and environmental benefits.

The invention relates to a multi-effect distillation seawater desalinating device of a multi-section type condenser, belonging to the technical field of seawater desalinization. The device comprises an evaporator, a condenser, a working steam inlet (1), a working steam condensate water outlet (2), a concentrated seawater connecting pipe (4), a condensed fresh water connecting pipe (5), a concentrated seawater draining pump (9), a fresh water draining pump (10), a secondary steam inlet condensing pipe (11), a seawater inlet (13), a cooling seawater draining port (14) and a seawater inlet branchpipe (16). The invention is characterized in that the condenser is divided into N sections from section 1 to section N, and seawater enters in the multi-section type condenser from the section N to the section 1 which are connected in series; on the basis of an original M-effect evaporator, an N-1-effect evaporator which corresponds to the N-section condenser is additionally arranged on the evaporator; secondary steam coming out of the original M-effect evaporator is divided into two paths and enters the 1-effect condenser and the M+1-effect evaporator in parallel, and so forth,, the secondary steam coming out of the M+N-1-effect evaporator enters the N-effect condenser finally. On the premise of not increasing the quantity of inlet seawater of unit water making quantity, the invention can increase the total temperature difference of the first evaporator and the last evaporator.

The invention discloses a distillation seawater desalting system using an expander and a compressor. The distillation seawater desalting system comprises a condenser, an expander and a compressor, wherein the condenser is used for performing heat exchange to influent raw seawater and secondary vapour, and then respectively discharging the heat-exchanged pre-heated seawater and condensed water, and discharging the seawater; an evaporator is provided with a primary effect evaporator, a plurality of middle effect evaporators and tail effect evaporators, which are arranged in series in sequence, wherein the tail effect evaporators are connected with the condenser, and the primary effect evaporator is provided with an inlet of mixed vapour; the expander is connected with the primary effect evaporator of the evaporator; and the compressor is respectively connected with the middle effect evaporators or the tail effect evaporators of the evaporator and the expander, respectively. The distillation seawater desalting system can improve the utilization efficiency of the vapour, so that the energy utilization efficiency of the seawater desalting system can be improved to more than 50% from the current about 25%, thus higher water making ratio is acquired and high efficiency utilization of the energy is achieved to achieve the energy-saving and environment-friendly purpose. The distillation seawater desalting system not only can be used for desalting seawater, but also can be used for concentrating feed liquid in the industries such as chemical engineering, food, pharmacy and the like.

The invention provides a multi-energy coupled seawater desalting system. The multi-energy coupled seawater desalting system is characterized by comprising a residual heat extraction device, a capillary stand pipe evaporator, a capillary driving evaporator, a sun focusing device, a solar evaporator, an air compressor, a wind turbine and a steam injector, wherein the residual heat extraction device is connected with a residual heat working medium conveying pipe and is connected with the capillary stand pipe evaporator; the capillary stand pipe evaporator is connected with a primary steam inlet of the capillary driving evaporator; the capillary driving evaporator is provided with the primary steam inlet, a seawater inlet, a seawater outlet, a secondary steam outlet and a fresh waster outlet; the sun focusing device is used for focusing solar to the solar evaporator; seawater is introduced into the solar evaporator through a seawater pipe; the solar evaporator is connected with a steam inlet of the air compressor through a steam pipe; the air compressor is connected with the wind turbine, and a steam outlet of the air compressor is connected with a high-pressure steam inlet of the steam injector; a primary steam outlet of the steam injector is connected with the primary steam inlet of the capillary driving evaporator.

The invention discloses a multi-effect membrane distillation seawater desalination system based on mechanical compression. The multi-effect membrane distillation seawater desalination system based on the mechanical compression comprises a plurality of serially-connected vacuum membrane distillation assemblies and heat exchange assemblies, a plurality of serially-connected concentrated water flash distillation tanks, a plurality of serially-connected fresh water flash distillation tanks, a mechanical steam compressor and a vacuumizing system, wherein the serially-connected vacuum membrane distillation assemblies and the heat exchange assemblies form multi-effect distillation in the conventional distillation sense; the serially-connected concentrated water flash distillation tanks receive concentrated seawater after membrane distillation and perform stage-by-stage flash distillation, and flash distillation steam is used as heating steam corresponding to each-effect material liquids; the serially-connected fresh water flash distillation tanks receive fresh water produced during the membrane distillation and perform stage-by-stage flash distillation, and flash distillation steam is used as heating steam corresponding to each-effect material liquids; the mechanical steam compressor raises the temperature and the pressure of secondary steam produced by the last-effect membrane distillation assembly through consumption of electric energy, and provides heating steam for the first-effect heat exchange assembly. The multi-effect membrane distillation seawater desalination system based on the mechanical compression couples a multi-effect membrane distillation process and a multi-stage flash distillation process, pumps the last-effect secondary steam through the mechanical steam compressor, and recycles the last-effect secondary steam after quality improvement to achieve gradient utilization of energy and two-way concentration of the material liquid, so that consumption of cooling water is not required, the heat efficiency is high, the water making ratio is high, the concentrating ratio is high, and the adaptability is high.

The invention discloses an evaporative seawater desalination system and an evaporative seawater desalination method by using wastewater of a marine engine. The system comprises a cylinder sleeve waterheat exchanger, a first-stage evaporation chamber, a condenser and a first sea water pump, wherein an air inlet and an exhaust outlet are formed in the first-stage evaporation chamber; a sea water spraying device is arranged in the first-stage evaporation chamber; a liquid collecting tank is formed in the bottom of the first-stage evaporation chamber; a draining outlet is formed in the bottom ofthe liquid collecting tank; an air inlet and an exhaust outlet are formed in the condenser; a condensation tube bundle is arranged on the condenser; a liquid collecting tank is arranged at the bottomof the condenser; a fresh water draining outlet is formed in the bottom of the liquid collecting tank. The seawater desalination system and the seawater desalination method disclosed by the inventionhave the characteristics of high water making ratio, simple system structure and method flow, convenience in operation and maintenance, low cost and the like. A humidifying-dehumidifying seawater desalination method is integrated with a circular cooling water system of the marine engine; the cylinder sleeve water heat exchanger is used for recovering sensible heat of circulating cooling water of the marine engine and most heat required by evaporating seawater is obtained, so that utilization efficiency of ship energy is improved, thermal pollution discharged into ocean and atmosphere is reduced, and economic benefits and environment-friendly benefits are remarkable.

The invention belongs to the technical field of seawater desalination, and relates to a utilization device of the steam waste heat of a vacuum device of a low-temperature multi-effect distillation seawater desalination system, a system containing the device, and a utilization method of the steam waste heat. The steam waste heat utilization device comprises one and more steam ejectors and corresponding steam / liquid heat exchangers; by using the steam ejectors and using high-temperature and high-pressure steam as a power, the steam with a low temperature and a low pressure discharged by the vacuum device of the low-temperature multi-effect distillation seawater desalination system is ejected so as to increase the pressure and the temperature of the ejected steam; the steam generated by the steam ejectors enters into the corresponding steam / liquid heat exchangers, and exchanges heat with material water so as to increase the temperature of the charging water in an evaporator and allow the steam to condense into fresh water. The device can effectively utilize low-grade steam, save energy, increase water generation ratio, and has important significance in the improvement of the economy of low-temperature multi-effect distillation seawater desalination systems.

The invention relates to the technical field of seawater desalination, in particular to an automatic backwashing and filtering device and method of a low-temperature multi-effect distillation seawater desalination system, the IPC classification number is C02F, the automatic backwashing and filtering device comprises a shell, an automatic control device, a water inlet pipeline, a water outlet pipe, a blow-off pipe and a filtering device body, the automatic control device is connected to one side of the shell, the water inlet pipeline is arranged at the front end of the shell, and the blow-off pipe is arranged at the rear end of the shell; the two ends of the water inlet pipeline are connected with the upper end and the lower end of the shell respectively, the water outlet pipe and the blow-off pipe are connected to the two sides of the shell respectively, and the filtering device is installed in the shell. A first water chamber and a second water chamber are arranged in the shell. The upper water inlet and distribution device and the lower water inlet and distribution device are used for independently supplying the dual-modular filtering device which is standby for each other, the backwashing effect is remarkably improved by utilizing a combined action mode of overclocking oscillation, cyclone filter screens and aeration disturbance, and the device has the advantages of shortening the shutdown time, being high in automation degree, stable in operation performance, capable of realizing online continuous operation and remarkable in effect.

A seawater desalinating system with solar heat pump is composed of the solar heat collecting and circulating unit consisting of solar heat collector, heat exchanger and circulating pump, the heat pump circulating unit consisting of compressor, condenser, expansion valve and evaporator, the flash evaporator consisting of heat exchanger and condenser, the seawater pipe, vapor pipe and vacuum pipe of flash evaporator are respectively connected via multi-effect distiller to seawater taking pipe, concentrated seawater condensing pipe, fresh water pipe and vacuum pipe, and the seawater condensing pipe and fresh water pipe are connected via evaporator to pump. Its advantages are high fresh water output and high utilization rate of energy.

The invention discloses a high-power concentration distillation desalting system and a high-power concentration distillation desalting method based on an induced crystallization method. The system comprises an evaporator, a condenser, a mother liquid tank, a crystal seed tank, a cyclone, a pump, a valve, and others. When the device is started, an induced crystal seed with the same or approximate scale crystal nucleus is fed in seawater through the crystal seed tank; thus the separated crystal scale formed during the evaporation process is preferentially attached on the surface of the induced crystal seed, thus deposition towards a heat exchange face is blocked; after normal running, mother liquid containing induced crystal grain backflows to a compulsory circular pipeline through the cyclone and the mother liquid tank, and conveys to every efficient evaporator by the compulsory circular pipeline to induce crystal seed; the induced crystal is not required to add. According to the method, the whole flow does not need to add chemical scale inhibitor, the additional influence of chemical scale inhibitor on the environment can be completely removed; meanwhile, the high-power concentration distillation desalting system can realize high power concentration, and greatly reduce raw material seawater intake and reduce the running power consumption on the basis of confirmed water load.

The invention provides a low-temperature multi-effect seawater desalting system and desalting method. Before raw materials enter a low-temperature multi-effect distillation system, when the raw material temperature is lower than the set temperature of materials entering a tail effect group of evaporators, the raw materials are preheated through a concentrated seawater heat exchanger, so that the raw materials reach the preset value when entering the evaporators; different-effect ingredient sections are used for feeding; concentrated water in the later effect group of evaporators is subjected to heat exchange with concentrated water recovered by the first effect group of evaporators through a concentrated water heat exchanger and enters the front effect group of evaporators. The problem of low material sea water recovery rate of the conventional parallel feeding flow process can be solved; the chemical adding and electric consumption cost is reduced; the defects of a conventional process mode are overcome; in addition, the heat efficiency of a low-temperature multi-effect desalting system is further improved; the equipment investment and operation cost is reduced; the technical flow process has the advantages of high water preparation ratio, high material water recovery rate, low electricity consumption, high heat efficiency, low equipment investment, low operation cost and the like.

The invention provides a method for treating the concentrated liquid of landfill leachate by membrane method, which comprises the following steps: pretreating the concentrated liquid by membrane method of landfill leachate to remove calcium ions and suspended matter that are easy to precipitate and scale, and increase the surface tension to more than 40mN / m, preferably to more than 65mN / m; then concentrated through a multi-effect membrane distillation system to obtain concentrated liquid and fresh water respectively; the concentrated liquid is evaporated, concentrated and crystallized, and the obtained solid salt is used as a harmless chemical filling Buried treatment, fresh water can be reused to the whole treatment process of landfill leachate. The method can treat the membrane concentrated solution of landfill leachate in a long-term, stable and effective manner, without changing the original process of the existing membrane concentration, without causing secondary pollution, and the process is simple, with low energy consumption and low operating costs. ; It can be applied to the membrane concentrated liquid treatment of various scales of landfill leachate.

The invention discloses a countercurrent multi-effect evaporation coupling immersion pipe flashing composite distillation seawater desalination device and method. Multi-effect evaporation apparatus each effect unit and immersion pipe flashing composite distillation apparatus each level unit are in alternate distribution in terms of a same number, and are all disposed in front of the corresponding immersion pipe flashing composite distillation apparatus each level unit; a steam-water separator is disposed at the upper part of the immersion pipe flashing composite distillation apparatus each level unit cavity, the bottom of the cavity is equipped with an immersion heating pipeline, except the last level, the other level units' top steam outlets of the immersion pipe flashing composite distillation apparatus are all in connection with multi-effect evaporation apparatus each effect unit's heating steam inlet correspondingly disposed therebehind; and the secondary steam outlets of the multi-effect evaporation apparatus each effect unit are all in connection with the inlets of the immersion heating pipelines correspondingly disposed in the immersion pipe flashing composite distillation apparatus each level unit therebehind. The device and the method provided by the invention realize optimum utilization of heat and wastewater zero discharge technology, are low in energy consumption and have good desalination effect.

The invention discloses a method and a device for desalinating sea water by a jet flow-heating process. The device comprises an evaporator, a condenser, a vapor distribution device, a water inlet system, a jet flow water distribution system, a circulating system, a fresh water system, a vacuum system, a non-condenser treatment system and a pump body system, wherein the evaporator is provided with the jet flow water distribution system and the vapor distribution system; the outlet of a jet flow water distribution device connected with the sea water inlet system is upward to spray sea water upwards; the jet flow water distribution device is provided with a water retaining plate, so that the water outflow of the jet flow water distribution device is distributed uniformly and forms an umbrella-shaped uniform water film layer; sea water is retained by the water retaining plate at the upper part of the jet flow water distribution device to form an umbrella-shaped water film. According to scientific technologies of heat transfer and fluid mechanics, sea water and vapor are in direct contact with each other completely, so that the heat transfer during sea water desalination is enhanced furthest, and therefore, the water production ratio of the system is raised, the energy consumption is lowered, and a high-efficiency energy-saving sea water desalinating technology is achieved.

The invention discloses a multi-effect membrane distillation-multistage flash evaporation seawater desalination system. The multi-effect membrane distillation-multistage flash evaporation seawater desalination system comprises a steam jetting pump (9), a concentrated water discharge pump (1), a material liquid circulating pump (2), a vacuum pump (3), a product water pump (4), N membrane assemblies, N freshwater flash evaporation tanks, N+1 heat exchange assemblies and N-1 concentrated water flash evaporation tanks, wherein the plurality of membrane assemblies and heat exchange assemblies are connected in series to form 'multi-effect' distillation in the term of the traditional distillation; the plurality of freshwater flash evaporation tanks and the plurality of concentrated water flash evaporation tanks are connected in series to form 'multistage' flash evaporation in the term of traditional distillation; the multi-effect membrane distillation process and the multistage flash evaporation process are coupled, secondary steam generated by membrane distillation is used for heating material liquid seawater, high-temperature concentrated seawater and product water which are discharged by membrane distillation are subjected to flash evaporation stage by stage, and the flash-off steam is used for heating material liquid seawater, so gradient utilization of energy and double concentration of the material liquid are realized, vaporized latent heat is effectively recovered, and heat efficiency, water making ratio and concentration ratio of a system are increased.

The invention discloses a parallel type multi-effect vacuum membrane distillation apparatus and method and belongs to the field of membrane distillation. The parallel type multi-effect vacuum membrane distillation apparatus which is low in energy consumption comprises n-stage parallel membrane distillation units; tube passes of a first feed liquid tank, a booster pump, a hollow fiber membrane module form a first closed circulation loop; tube passes of the hollow fiber membrane modules of the second stage to the nth stage, the shell pass of a shell-and-tube heat exchanger of the former stage, the feed liquid tank and the booster pump of the corresponding stage form a second closed circulation loop, a third closed circulation loop..., an nth closed circulation loop. The tube pass of a shell-and-tube heat exchanger of the nth stage is communicated with a cooler. In each stage, the outlet of the shell pass of the hollow fiber membrane module and a finished product collection tank are communicated with the inlet of the tube pass of the corresponding shell-and-tube heat exchanger; a thermometer is arranged on a connection pipeline between the booster pump and the hollow fiber membrane module. Besides, the outlet of the tube pass of the shell-and-tube heat exchanger of the first stage to the outlet of the tube pass of the (n-1)th stage are respectively communicated with the outlet of the shell pass of the hollow fiber membrane module of the next stage and then communicated with the inlet of the tube pass of the shell-and-tube heat exchanger of the next stage, and the outlet of the tube pass of the nth shell-and-tube heat exchanger is communicated with a vacuum pump.

The invention relates to a low-temperature multi-effect seawater desalting multi-stage superposed adjusting raw water supply system which comprises a plurality of evaporators connected in series, adopts a multi-stage water supply mode, and is provided with multi-stage water supply mains, wherein one communication device is arranged between adjacent raw water supply mains to adjust water supply amounts among different raw water supply mains, the raw water supply amount of each stage except for the last stage is the optimal raw water spray amount of each effect, and the total raw water supply amount of the last stage is more than the sum of the required raw water amount of each effect of this stage. When the raw water supply amount of each stage is less than the optimal required raw water amount of all effects of this stage, the raw water supply main of the next stage adjusts the supply to the water supply main of the previous stage. By using the technical scheme of the invention, the ultimate discharge concentration of saline water can be controlled.

The invention provides an energy comprehensive utilization method and system for coupling flue gas white plume elimination with sea water desalination. The system mainly comprises a thermal power plant thermodynamic system, a flue gas white plume elimination and heat removal system and a low-temperature seawater desalination system. The method comprises following steps: flue gas exhausted by a boiler sequentially is introduced into a cooler after passing through a dust remover and a desulfurizing tower, more than 90% of water vapor in the flue gas is condensed and separated out, and then is discharged through a chimney, and flue gas white plume elimination of the desulfurized flue gas is achieved; main steam generated by the boiler is exhausted into the condenser after acting in a steam turbine, in the condenser, seawater is adopted for cooling, most of the seawater is exhausted back to the sea after being heated, and a small part of the seawater is treated and then is conveyed into aseawater desalination preheating system, and finally is introduced into a low-temperature multi-effect evaporation module to generate fresh water; a low-temperature heat source required by the low-temperature multi-effect evaporation is provided by a heat pump in the flue gas white plume elimination and heat removal system, and low-temperature extraction gas of a steam turbine is taken as a heat pump driving heat source. The method is capable of organically combining flue gas white plume elimination water extraction and seawater desalination, ingeniously combining the two processes into a whole, achieving dual benefits of environmental protection and energy conservation, and is promising in application prospect.

The invention discloses a cleaning method of a seawater desalination device. The seawater desalination device comprises an n-effect evaporator, a brine pump and a seawater booster pump, each effect evaporator in the n-effect evaporator is provided with seawater spraying pipelines and a strong brine pipeline communicating with liquid sprayed by the seawater spraying pipelines, The cleaning method comprises the following steps that a pickling solution is injectied into the strong brine pipeline between two adjacent evaporators from the second-effect evaporator to the n-effect evaporator to enable the pickling solution to sequentially flow through the brine pump and the seawater booster pump and then sprayed into the second-effect evaporator to the n-effect evaporator through seawater spraying pipelines, and the pickling solution is in contact with the outer walls of heat exchange pipes in the second-effect evaporator to the n-effect evaporator. According to the cleaning method of the seawater desalination device, water scales on the heat exchange pipe on the brine side of the evaporators in the seawater desalination device, heat exchange pipe plates and the inner walls of the evaporators can be effectively removed, a good cleaning effect is achieved, and the seawater desalination water production ratio is greatly increased.

The invention discloses a distillation seawater desalting system using an expander and a compressor. The distillation seawater desalting system comprises a condenser, an expander and a compressor, wherein the condenser is used for performing heat exchange to influent raw seawater and secondary vapour, and then respectively discharging the heat-exchanged pre-heated seawater and condensed water, and discharging the seawater; an evaporator is provided with a primary effect evaporator, a plurality of middle effect evaporators and tail effect evaporators, which are arranged in series in sequence, wherein the tail effect evaporators are connected with the condenser, and the primary effect evaporator is provided with an inlet of mixed vapour; the expander is connected with the primary effect evaporator of the evaporator; and the compressor is respectively connected with the middle effect evaporators or the tail effect evaporators of the evaporator and the expander, respectively. The distillation seawater desalting system can improve the utilization efficiency of the vapour, so that the energy utilization efficiency of the seawater desalting system can be improved to more than 50% from the current about 25%, thus higher water making ratio is acquired and high efficiency utilization of the energy is achieved to achieve the energy-saving and environment-friendly purpose. The distillation seawater desalting system not only can be used for desalting seawater, but also can be used for concentrating feed liquid in the industries such as chemical engineering, food, pharmacy and the like.

The invention discloses a sea water desalination device, which relates to the technical field of sea water desalination. The interior of a tank is provided with a cavity, the sidewall is provided withone or two openings, and the openings are closed by cover plates; an evaporator is arranged in the cavity and distanced from the wall of the cavity, the evaporator comprises a primary liquid-absorbing layer and pipelines buried in the primary liquid-absorbing layer, and both the inlets and outlets of the pipelines pass through the cover plates to communicate with the outside; at least one layer of secondary evaporation layer is concentrically arranged around the periphery of the evaporator, and is spaced for a predetermined distance, and the secondary evaporation layer consists of a condensing plate and a secondary liquid-absorbing layer which are in tight contact; both the primary liquid-absorbing layer and the secondary liquid-absorbing layer are a porous material, at least the part, which is in contact with the primary liquid-absorbing layer and the secondary liquid-absorbing layer, of one or two cover plates is the porous material, and pores in the primary liquid-absorbing layer,the secondary liquid-absorbing layer and the cover plates communicate with one another. The sea water desalination device can sufficiently recycle residual heat, so that the water production ratio isincreased, and water can still be stably and efficiently produced under a shaking state.

The invention provides a medical injection water preparation system and a control method thereof. The medical injection water preparation system comprises a preparation unit and a control unit, wherein the preparation unit is used for preparing medical injection water; the control unit is arranged in the preparation unit and used for controlling and adjusting the preparation unit in the working process, so that in the medical injection water preparation system, the pressure of a steam generator is kept at 0.4-0.8 MPa, and the liquid level is kept at 5-35 cm; steam ejected from a steam outlet of a steam ejector is maintained to be saturated steam with a temperature of 112-125 DEG C; the temperature drop between two adjacent falling film evaporators is kept at 3-5 DEG C; and the water production ratio of qualified product water of the medical injection water preparation system is not less than 8. The system has the beneficial effects that the overheating phenomenon existing after pure water steam and supplementary steam are mixed is overcome, and the problem that the heat efficiency of the first-effect evaporator is insufficient due to elimination of the steam superheat degree is solved; and possible pipe emptying, pipe submerging and other bad working conditions in the system are eliminated, and high operation stability and ideal water production efficiency of the injection water preparation system are guaranteed.

The invention relates to a seawater multi-effect membrane distillation desalination salinity valve opening flow control device, the structure of which comprises: microporous membrane, seawater desalination device, sea current mixing rod, seawater evaporator, salinity flow control device, microporous membrane Embedded and installed on the upper surface of the seawater desalinator, the sea current mixing rod is installed inside the seawater desalinator, and the seawater evaporator is embedded and installed at the bottom of the seawater desalinator. When the inflow of the seawater desalinator increases, the seawater inside the seawater The salinity becomes thinner under the dilution of excess seawater, and the content of hydrated metal ions in seawater decreases per cubic meter, which reduces the conductivity of the sea salt conductor inside the salinity flow control device, reduces the suction of the water flow control block, and makes the water flow The lowering of the control block reduces the water outlet of the water inlet area, so that the inflow of the seawater desalinator becomes smaller, so as to balance the heat loss of the water vapor passing through the microporous membrane, increase the water production ratio that is reduced due to the increase of the inflow, and increase the seawater desalination The water production rate of the device.