196 results about "Multiple-effect distillation" patented technology

A desalination process is disclosed which combining two or more substantially different water treatment processes in a unique manner to desalinate saline water, especially sea water, to produce a high yield of high quality fresh water, including potable water, at an energy consumption equivalent to or less than much less efficient prior art desalination processes. In this process a nanofiltration step is synergistically combined with at least one of sea water reverse osmosis, multistage flash distillation. multieffect distillation of vapor compression distillation to provide an integrated desalination system by which sea water can be efficiently and economically converted to high quality potable water in yields which are at least 70%-80% greater than the yields available from the prior art processes. Typically a process of this invention using the nanofiltration initial step will produce, with respect to sea water feed properties, calcium, magnesium, sulfate and bicarbonate ion content reductions of 63%-94%, pH decreases of about 0.4-0.5 units and total dissolved solids content reductions of 35%-50%.

An optimal thermal seawater desalination process is disclosed, which combines two or more substantially different water pretreatment processes in a unique manner and in a special configuration, hereto unknown to prior desalination arts, to produce a high yield of high quality fresh water, including potable water. In this process a two stage NF membrane pretreatment unit (NF2) with an energy recovery turbo charger (TC) device in between the stages or equipped with an energy recovery pressure exchanger (PX) is synergistically combined with at least one thermal desalination unit to form a dual hybrid of NF2-Thermal (FIG. 4 ), or alternatively the two stage NF2 unit is synergistically combined with a two stage SWRO unit (SWRO2) with an energy recovery TC in between the stages or combined with one stage SWRO (SWRO1) equipped with an energy recovery TC or PX system and the reject from the SWRO2 or SWRO1 unit is made make-up to a thermal unit to form a tri-hybrid of NF2-SWRO2 reject-Thermal (FIG. 5 ). In both the cases of di- or trihybrids the thermal unit is equivalent to a multistage flash distillation (MSFD) or multieffect distillation (MED) or vapor compression distillation (VCD) or thermal reheat (RH) evaporator. Typically a process of this invention using the two stage NF2 initial pretreatment step will perform a semi-desalination step by reducing feed TDS by about 35 to 50%, but most important, especially to the thermal seawater desalination process, it removes the water recovery limiting, scale forming hardness ions of Ca++ and Mg++ by better than 80% and their covalent anions of sulfate to better than 95% and bicarbonate to about 65%. The removal of scale forming hardness ions, especially SO4=, and bicarbonates allowed for the operation of thermal unit in the above hybrids at top brine temperature (TBT) much greater than its present TBT limit by the singular conventional process of 120° C. for MSFD and operation of MED or VCD or RH unit at TBT much higher than their present TBT limit of 65-70° C., with many advantages gained by this process over prior art sweater desalination processes. The process of this invention exceeds all prior thermal seawater desalination arts in efficiency, including water yield, product water recovery ratio and unit water cost as well as in energy consumption per unit product which is equivalent or less than other efficient prior art seawater thermal desalination processes. By this process, an NF product recovery ratio of 75 and 80% or better is achieved from the high salinity Gulf sea (TDS≈45,000 ppm) and about an equal product recovery ratio is also obtained from the SWRO or thermal unit when it is operated on NF product for a total water recovery ratio in excess of 52% for seawater

The invention discloses a low-temperature multieffect seawater distillation desalting system. The system comprises a plurality of multi-effect evaporator sets; each evaporator set is at least provided with a heater for preheating feeding seawater; an effect intermediate pump is arranged between two adjacent multi-effect evaporators; and one end of a condenser is connected with a raw material water pump, and the other end of the condenser is connected with the last evaporator set of the plurality of the multi-effect evaporator sets. The invention also discloses a process flow for utilizing the low-temperature multieffect seawater distillation desalting system to desalt seawater; the evaporators of the low-temperature multi-effect seawater distillation desalting system are divided into a plurality of sets; each set feeds in parallel; simultaneously, the front of the feeding seawater of the highest-temperature effect evaporator of each set is provided with a heater; residual strong brine of the front evaporator set is collected and beaten to the next evaporator set through the effect intermediate pump, and so on; a product water and strong brine flow in a ladder shape in a series of flash tanks and are gradually subjected to flash evaporation and cooling; steam obtained through flash evaporation enters the evaporator; and finally, the product of the cooled water and the strong brine are pumped out through a corresponding water pump respectively.

The invention discloses a seawater desalting method and a seawater desalting device. Wind power is used as a working power supply in the method; the heated purified water is fed into a heat storage tank, and heat is circularly supplied by two paths; one path of hot water enters a first effect of a multi-effect distilled seawater desalting device and is used as a seawater desalting heat source, and enters the heat storage tank after heat release; the other path of hot water enters a pre-heater of the first effect of the multi-effect distilled seawater desalting device to a pre-heater of the last effect in turn, and flows back to the heat storage tank after pre-heating the seawater; after the seawater in a first effect evaporation chamber is evaporated in a falling film tube, the obtained thick seawater is led out, and the generated steam enters a second effect falling film tube and is used as a seawater evaporation heat source; the seawater flowing out from the next effect evaporation chamber is heated by the previous pre-heater and then enters the previous effect evaporation chamber; and the condensed steam generated by the last effect evaporation chamber is used as produced fresh water for discharge. The device is suitable for the seawater desalting method, and mainly comprises a solar heat collecting system, a seawater pre-heating system, a multi-effect distilled seawater desalting system and a heat pump system.

The invention discloses a desalting method and device. The method is designed to desalt seawater through low heat energy spray vaporization and multiple-effect seawater distillation. The invention pertains to a desalting technical field of seawater or brackish water. The desalting device comprises a spray and vapor room which is provided with a nozzle and a demister. An air inlet is connected with a separator of air and water, a fan and a heater are positioned on a connection pipe. The inlet and outlet of the first effect heating steam of the multiple-effect distillation device are separately communicated with an outlet of wet and heat air of the spray and vapor room and with a middle part port in the vapor and water separator. The second steam of the every effect is used as the heating steam for the next heating steam, but after heated and pressurized of the second steam of the final effect, the second heating steam is interfused into hot and damp air discharged from the spray vapor room. The tops of the multiple-effect distillation device are communicated with the tube pass of a shell and tube heat exchanger, and the bottom of the multiple-effect distillation device is communicated with a heavy salt water tube. The invention takes the advantages of low heat energy as the energy recourse of desalting process to couple spray vapor and multiple-effect distillation technic and realizes comprehensive utilization of the energy and resources.

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 relates to a method for recovering and recycling silicon slice cutting waste mortar. The method is characterized by comprising the following steps of: 1, pre-treating: uniformly stirring raw mortar and water and performing solid-liquid separation by using a plate and frame type filter press; 2, recovering polyethylene glycol (PEG): adding a decoloring agent into filtered liquid, and performing plate and frame filtering; treating obtained filtrate by using ion exchange resin or a multiple-effect distiller; and performing reduced pressure distillation, rectification and fine filtering to obtain a PEG finished product; and 3, recovering silicon carbide: mixing filtered filter cakes and water according to a proportion of 1:(3-4), stirring to form mortar; separating the mortar by using a multi-stage cyclone; performing acid washing; separating by using the cyclone; filtering by using a belt filter; and drying to obtain the silicon carbide finished product. By the method, the separation amount is large, recovery rate is high, recovered PEG and silicon carbide have high quality, and the method saves energy and is environmentally-friendly.

Disclosed is an improved method for remineralizing desalinated water. The desalination system includes, but is not limited to, a conventional reverse osmosis membrane system, forward osmosis membrane system, electro dialysis system, Multi Stage Flash (MSF) system, and Multi Effect Distillation (MED) system.

The invention relates to endophragm anticorrosion dope of carbon steel material vaporizing equipments in seawater desalting craft of low temperature and multiple effect distillation. It mainly comprises basic materials, pigment, padding, auxiliary agent and solvent. The basic materials are one or more than one kind of epoxy resin and painthydroxybenzene modified thermostable resins. The painthydroxybenzene modified thermostable resins are one or more than one kind of painthydroxybenzene silicon resin, painthydroxybenzene furol resin and painthydroxybenzene titanium resin got from chemical modification of painthydroxybenzene distilled from fresh paint; the color padding is one or more than one kind of titanium oxide powder, talcum powder, mica powder, mica ferric oxide, gas phase silicon dioxide, silica flour, porcelain powder and bentonite. The dope is solidified at room temperature. It has excellent permeability resistance of water, seawater and vapor at high temperature and is suitable to anticorrosion of low temperature.

The invention discloses a heat pump distillation and multi-effect distillation integrated device and process for purifying trichlorosilane. The steam at the top of a high-pressure tower which is a high-boiling-fraction removal column is used to heat liquid at the bottom of a low-pressure tower which is a low-boiling-fraction removal column, the steam at the top of the high-boiling-fraction removal column is condensed, and the process is a multi-effect distillation process; meanwhile, the steam at the top of the low-boiling-fraction removal column is subjected to pressure and temperature rise through a compressor and then is used for heating the liquid at the bottom of the high-boiling-fraction removal column, the steam at the top of the low-boiling-fraction removal column is condensed, and the process is a heat pump distillation process; and the integration of the heat pump distillation and multi-effect distillation can be realized in the whole process. In the whole process flow, one compressor is additionally arranged, the heat exchange process inside a rectification system is realized by two heat exchangers and condensers and reboilers are saved simultaneously, that is to say, small amount of electricity consumption of one compressor is added and a large amount of cold energy and heat public works are saved, and thereby the energy consumption for the whole rectification and purification process of the trichlorosilane is greatly reduced.

The combination multi-effect distillation and multi-stage flash evaporation system integrates a multi-stage flash (MSF) evaporation system with a multi-effect distillation (MED) system such that the flashing temperature range of the MSF process is shifted upward on the temperature scale, while the MED distillation process operates in the lower temperature range. The multi-stage flash evaporation system includes a plurality of flash evaporation / condensation stages, such that the multi-stage flash evaporation system receives a volume of seawater or brine from an external source and produces distilled water. The multi-effect distillation system includes a plurality of condensation / evaporation effects, such that the multi-effect distillation system receives concentrated brine from the multi-stage flash desalination system and produces distilled water.

The invention is a double-distillation type multiple effect distilled water machine, belonging to water distillation device. Its features lie in: the evaporator is divided into two segments, the upper one is steam-water separation segment, the lower is evaporating segment, the steam inlet arranged on the evaporating segment of the first effect evaporator is connected to industrial boiler steam source, the water condensing port is connected to preheater, the condensing ports of the following effect evaporator are connected to the condenser, there arranges a material condensed water discharging port on the last effect evaporator, the water pipe is connected to the water inlet of the first evaporator through condenser pipe and preheater. The invention can use the residue heat generated by the device, upgrades the use factor of heat and the reclaiming rate of distilled water, and the structure is compact.

Multi Effect Distiller (MED) with vertical flat-plate, falling-film heat transfer mechanism. A multitude of alternatively arranged or “checkered”, rectangular shaped evaporator and condenser cells form one layer between two vertical flat plate walls. Multitude of layers—each comprised of alternating evaporator and condenser cells—form the block-shaped MED unit. The evaporator and condenser cells are against each other, sharing common vertical heat transfer walls. The simultaneous propagation of multi effect distillation occurs in two dimensions along the longitudinal vertical plane of the heat exchanger. One end of the distiller is heated, while the other end is cooled.

The invention discloses a film-case typed multiple-effect falling-film distilling desalination device of seawater, which is characterized by the following: adopting plastic film to replace traditional metal heat exchange material to make film beam heat-exchange component; welding two films; drawing silk ribbon; supporting keel to form film beam; placing multiple film beams at equal interval; welding film beam and end film to make heat exchange component of film beam; connecting end film and case; insulating seawater from fresh water; placing film beam component in certain container unit of case to constitute evaporator.

A multiple effect distillation chamber includes a plurality of separate distilling chambers and a drain chamber at a downstream end of the distilling chambers. The drain chamber functions to create a vacuum to draw volatile gases and impurities collected at the end of the distilling chambers into the drain chamber. The drain chamber cools the volatile gases via cooling water, whereby the cooling water and volatile gases are not mixed during the cooling process, such that the cooling water may be recycled and reused. The drain chamber may include two heat exchangers, each receiving cooling water from a separate water source. Utilizing separate water sources in conjunction with the dual heat exchangers of the drain chamber enables the flow rates of the cooling water sources to be adjusted to enable the disposal of waste water from the distiller at any desired temperature without affecting other functions of the distillation system.

The solar-energy sea water desalting equipment can heat the heat conducting medium to required high temperature while ensure required heat conducting medium flow rate. The equipment includes a high-temperature heat collector to collect solar energy and heat the heat conducting medium and with heat conducting medium inlet pipe and outlet pipe; a steam boiler to produce high temperature steam usingthe high temperature heat conducting medium; and a multieffect distiller to distill sea water to produce fresh water. It is characterized by the high-temperature heat collector comprising several parallelly connected heat collecting devices connected between the heat conducting medium inlet and outlet pipes, and each heat collecting device comprising several heat collecting units with several high temperature heat collecting pipes serially connected.

The invention discloses a loop heat pipe-type cylindrical solar seawater desalination device. The device comprises a cylindrical multiple-effect distiller, a light collection groove and a loop heat pipe. An evaporating pipe of the loop heat pipe is used as a solar heat collecting pipe and a condenser pipe of the loop heat pipe is used as a distiller heating pipe so that characteristics of good heat transfer performance and high integral efficiency are obtained. A heating pipe, a heat-transfer pipe, a semi-circular groove and a nozzle unit are tightly arranged in a heat-insulation cylinder inner-cavity so that a pre-heating chamber, a distillation chamber, a seawater tank and a fresh water tank are formed and thus the distiller structure is very compact, can be processed easily and is suitable for standard production. The distiller has the characteristics of repeated use of vaporization latent heat, reinforcement of inner heat and mass transfer processes and improvement of an operation temperature. The heat transfer areas of the distillation chamber are increased from inside to outside so that a small heat transfer temperature difference is kept, the whole distiller effective number is improved and a concentration ratio and a water yield are further improved. The loop heat pipe-type cylindrical solar seawater desalination device is suitable for low-cost modularization production and can be widely used in the field of solar energy seawater desalination.

A process and system for producing a H2-containing product gas and purified water from an integrated catalytic steam-hydrocarbon reforming and thermal water purification process. Raw water, such as salt water, is heated by indirect heat transfer with reformate from the catalytic steam reforming process for purifying raw water in one of a multiple effect distillation process and a multi-stage flash process.

The invention discloses a multi-effect distillation device only by using solar energy to desalt sea water or brackish water and the method. The device comprises three parts: a solar energy collector, a multi-effect evaporator and a condenser. The method of the device for desalting the sea water or the brackish water comprises the processes: vacuum of each effect evaporator is regulated; steam generated in each effect evaporator sequentially enters a condensation heat exchange tube in a next effect evaporator through a steam outlet of the effect evaporator; after the condensation, the fresh water is obtained, and energy for vaporizing the sea water or brackish water in the effect evaporator is provided. The invention has the advantages of simple desalting process and device as well as reliable operation and running and no consumption of other energy except that the solar energy supplies heat, which is particularly applied to areas short of the fresh water but rich in the sea water, brackish water and the solar energy.

The invention relates to a saline treatment system and method belonging to the technical field of water treatment. A concentrating type solar heater, a steam generator, a vacuum multi-effect distillation device, a saline pump, a fresh water pump, a saline heater, an oil pool, an oil pump and a gas and water separator are used in the system and method. High-temperature heat conducting oil generated by the concentrating type solar heater is respectively conveyed to the steam generator and the saline heater, saline pumped in the saline heater is heated to high-temperature saline and then conveyed to the vacuum multi-effect distillation device, and fresh water pumped in the steam generator is heated to steam and then conveyed to the vacuum multi-effect distillation device. Strong saline is finally discharged. As the saline is heated by the high-temperature heat conducting oil generated by solar energy so as to generate the high-temperature saline, and the cycling utilization fo the steam is formed by utilizing gas and water separation, the steam quantity required by a heat exchange evaporator of the vacuum multi-effect distillation device can be greatly reduced. Furthermore, the evaporation efficiency of the saline can be greatly increased, and equipment investment can be reduced.

A structure for a multiple-effect still includes a horizontal shell encompassing a plurality of effects and a series of vertical compound baffles fastened to the horizontal shell and dividing it into a series of pressure-tight chambers. Each chamber along with its associated apparatus constitutes an effect. Each compound baffle comprises a fixed baffle and a removable baffle. A heat exchanger is fastened to the removable baffle and includes an evaporation surface, a condensation surface, and a pressure chamber isolated from the pressure-tight chamber in which it is located. A port in the compound baffle allows evaporate to pass between the pressure chamber and the pressure-tight chamber of an adjacent effect. The shell is provided with a removable top plate to provide access to the heat exchanger and allow removal of the heat exchanger and removable baffle.

The invention discloses a device for seawater desalination based on solar energy heat collection. Traditional seawater desalination technology is quite low in efficiency with respect to both energy utilization and water yield per unit area. The device of the invention comprises a solar energy heat collection system, a heat transfer oil heat exchange system, a seawater desalination system and a power supply control system; the solar energy heat collection system adopts solar energy trough-type heat collection equipment; the heat transfer oil heat exchange system and the seawater desalination system convert the heat of the heat transfer oil into direct energy for seawater desalination through a heat exchanger; the separation of saline water from fresh water is completed by multiple-effect distillation; the power supply control system supplies working voltage for the heat collection equipment, heat exchange equipment, seawater desalination equipment, all driving motors and control equipment, and controls through a control line. The invention realizes the integration of solar energy heat collection and seawater desalination, wherein the recycling of the heat transfer oil improves the utilization rate of solar energy, and the water yield per unit time is also increased greatly.

The invention relates to an MED-TVC seawater desalination combination system by means of power station waste heat. Seawater is preprocessed, conveyed to a condenser to be preheated and then further preheated through a first heat exchanger and a second heat exchanger in sequence, and enters N-effect evaporators through pipelines in a shunting mode, wherein a heat source of the first heat exchanger is condensation water of the first-effect evaporator, and a heat source of the second heat exchanger is low-temperature hot flue gas flowing inside the second heat exchanger; meanwhile, low-temperature steam extraction and middle-effect steam of a turbine are introduced to the first-effect evaporator through a steam ejector, a heat source of multi-effect distillation seawater desalination is provided, seawater is distillated on the basis of the MED-TVC technology to obtain desalted water, the condenser condenses steam flowing out of the last-effect evaporator and preheats seawater, and strong brine in the Nth-effect evaporator is conveyed to a salt chemical engineering technological unit. Power station low-temperature flue gas and low-pressure steam extraction waste heat of the turbine are recycled, seawater desalination production is achieved, the seawater desalination cost is effectively lowered, and no secondary pollution is generated.

A system includes an intercooler configured to flow a working fluid and compressed air of a gas turbine engine through the intercooler to exchange heat between the working fluid and the compressed air. The system also includes a multi-effect distillation system configured to flow the working fluid and a mixture to exchange heat between the working fluid and the mixture to enable distillation of the mixture.

The invention discloses a multi-effect distillation and multi-stage flash evaporation solar sea water desalination method. The method comprises the steps of: feeding sea water for desalination into a heat exchanger through a cooling sea water pump and a conveying pipeline for sea water for desalination; after heating the sea water to a saturated temperature by the heat exchanger, feeding the sea water into a tickling pipe in a first-effect distiller and tickling the sea water on a horizontal tube bundle, wherein the first-effect distiller is provided with heat quantity by solar heated hot water; exchanging heat with hot water in the horizontal tube bundle to generate steam as a heat source of a secondary-effect distiller; after saturated sea water from the previous effect distiller and condensed water flow into the next effect distiller for flash evaporation by virtue of a pressure difference between the effects, feeding the steam generated by the last-effect distiller and condensed water in the previous distiller together into a condenser to be condensed by cooled sea water and feeding the mixture into a fresh water tank; and finally, pumping the mixture out by a fresh water pump. As the heat exchanger is arranged in the system, by adopting horizontal tube falling film evaporation with a small temperature difference, heat quantity of concentrated sea water and last-effect steam are repeatedly used, so that the device has a higher energy utilization ratio and a higher water production rate.

The invention relates to a high-temperature gas cooled reactor and low-temperature multiple-effect distillation seawater desalinization coupling device. The coupling device is characterized in that a condensation bypass and a flash vaporization device are additionally arranged on a secondary circuit condensation water or steam pipeline after power generation of a high-temperature gas cooled reactor; the condensation bypass is provided with a heat exchange device, a cooling seawater output pipeline of the heat exchange device is connected with the flash vaporization device, a live steam output pipeline at the top of the flash vaporization device is connected with a multi-effect distillation seawater desalinization device, a heat exchange hot seawater output pipeline at the bottom of the flash vaporization device is combined with the cooling seawater output pipeline and then connected to the heat exchange device of the condensation bypass; the heat exchange hot seawater output pipeline at the bottom of the flash vaporization device is combined with a concentrated seawater output pipeline at the bottom of the multiple-effect distillation seawater desalinization device and then led to the sea. According to the invention, the heat energy of condensation water (steam) after power generation can be comprehensively utilized, so that the energy utilization efficiency of the high-temperature gas cooled reactor is greatly improved, and meanwhile, the fresh water yield is improved. The coupling device realizes hydropower generation of the high-temperature gas cooled reactor.

Present invention is a practical, highly efficient, structurally simple, low production cost, easy to manufacturing, and inexpensive multi-effect distillation device composed of thin-laminated distiller which is tangled into spiral and becomes layers of centric circle; one side of surface of said distiller is condensing surface which is for condensation of vapor of water, condensed distilled water is drained from underneath of said condensing surface, another side of said distiller is attached with a piece of wick which is made of capillary materials, undistilled water enters from above of the wick, than be absorbed and distributed by said wick. Some of the water absorbed on said wick is evaporated into the vapor of water. There is a gap between condensing surface and wick of each adjacent layers. The top and bottom of said gap is sealed to prevent leaking of the vapor of water.

The invention relates to a fresh water collecting and supplying system, comprising a water inlet pipe, a heat energy supply device, a distilling device, a rainwater collector and a fresh water collector, wherein the heat energy supply device is respectively connected with the water inlet pipe and the distilling device, the fresh water collector is connected with the distilling device, seawater from the water inlet pipe is heated by the heat energy supply device and then introduced into the distilling device for multi-effect distilling and condensing, and fresh water converted from the seawater is introduced into the fresh water collector; and the rainwater collector is connected with the fresh water collector and is used for delivering collected rainwater into the fresh water collector. According to the invention, circulating water is heated by using a heat collector in sunny days, the circulating heated water supplies heat for the vertical type multi-effective distilling device to produce fresh water through a circulating pump; and the rainwater is collected by using a reflecting plate arranged below the heat collector in rainy days and is subjected to depth-type filtration and purification to obtain the fresh water, so that the fresh water can be collected both in sunny days and rainy days, the supply level of the fresh water is increased; and the fresh water collecting and supplying system is particularly suitable for districts which are rich in solar energy and lack of fresh water resources.

The invention discloses an air type immersing distillation-multiple-effect evaporation seawater desalting device and method. The device comprises an immersion combustion distillation device, a lithium bromide absorption type heat pump, a low-temperature multiple-effect distillation device, an air blower, a heat pipe heat exchanger, a draught fan, a gas-water separator and a seawater storage pot. An air inlet of the immersion combustion distillation device is connected with an air side of the heat pipe heat exchanger and the air blower; a water steam and wet hot air outlet is connected with an inlet of a shell of a lithium bromide absorption type heat pump evaporator; an outlet of the shell of the lithium bromide absorption type heat pump evaporator is connected with the gas-water separator; a connecting pipeline is provided with the draught fan; a heat exchanging pipeline of a lithium bromide absorption type heat pump generator is connected with a smoke side of the heat pipe heat exchanger; and a cooling pipeline of a lithium bromide absorption type heat pump condenser is used as a heating steam pipeline of a first-effect device of the low-temperature multiple-effect distillation device. The air type immersing distillation-multiple-effect evaporation seawater desalting device and method have the advantages of high smoke residual heat recycling utilization rate, high device heat efficiency, large fresh water output, low fresh water cost and the like, and can be widely applied to a seawater desalting field.