57results about How to "Good temperature matching" patented technology

The invention discloses a heat and humidity segmented treatment air-conditioning device and method combined with radiation cold supply. The device mainly comprises a cold water unit, an air treater, a radiation coil pipe, a water pump, an electromagnetic valve and a pipeline. In a system, chilled water obtained by the cold water unit is used for cooling and dehumidifying air, and is supplied to a ceiling or a floor radiation coil pipe for radiation cold supply to realize segmented treatment of heat and humidity loads in a room. The radiation coil pipe is used for supplying cold and bearing a part of sensible heat load in the room, and dehumidified supply air is used for bearing the other part of sensible heat load in the room and indoor humidity load and preventing a radiation surface from moisture condensation. Chilled water is segmentally applied to dehumidification and radiation cold supply, and the temperature difference between supply water and return water is about 7-10 DEG C. A refrigeration cycle of a water chilling unit is realized with a non-azeotropic refrigerant, and good temperature matching of chilled water and the refrigerant in the heat exchanger is realized by means of the temperature slippage characteristic of the non-azeotropic refrigerant, so that the performance coefficient of the unit is increased.

The invention discloses a gas-liquid countercurrent two-stage hydrocracking method, which comprises the following steps: (1) using a fixed bed reactor, mixing feedstock oil with hydrogen, then firstlyenabling the mixture to enter a hydrofining reactor for carrying out desulfurization, denitrification and an aromatic hydrocarbon saturation reaction, and then enabling effluent to enter a flash tankso as to be subjected to gas-liquid separation; (2) enabling new hydrogen to enter a hydrocracking reactor from the bottom of the hydrocracking reactor, and enabling liquid phase effluent, obtained after separation of the flash tank, to enter the hydrocracking reactor from the top of the hydrocracking reactor so as to be subjected to a hydrocracking reaction, and enabling gas phase, obtained after separation of the flash tank, to separately enter different bed layer inlets of the hydrocracking reactor; (3) enabling effluent of the hydrocracking reactor to enter a separation system so as to besubjected to gas-liquid separation, recycling the separated gas as supplemental hydrogen, enabling the liquid phase product to enter a fractionating tower so as to be separated, carrying out fractionation in a the fractionating tower to obtain naphtha, jet fuel, diesel oil and tail oil. The method can effectively solve the problem of temperature matching of the refining and cracking reactors, reduces the consumption of cold hydrogen at an entrance of the cracking reactor, and increases the yield of the naphtha.

The present invention discloses the composition and preparation process of phase change heat accumulating material. The phase change heat accumulating material consists of crystalline sodium acetate, borax as additive and polyacryamide mainly. The preparation process includes grinding and mixing the said components, heating the mixture to smelting and pouring into packing container; or includes dissolving crystalline sodium acetate, adding borax via stirring, adding polyacryamide via stirring and final pouring into packing container. The phase change heat accumulating material of the present invention has the advantages of great heat accumulating amount, low supercooling degree, proper phase change temperature, no phase separation after long term use, etc.

The invention discloses a method for producing hydrogenated diesel oil with a low freezing point. The method comprises the following steps: mixing a diesel oil raw material with hydrogen, allowing the obtained mixture to sequentially go through at least two serially connected hydrogenation reaction zones, wherein the hydrogenation reaction zones sequentially comprise a pour point reduction modified catalyst composite bed layer filled with a hydrodewaxing catalyst and a hydroupgrading catalyst and a hydrodewaxing catalyst bed layer along a material flow direction; and separating a reaction effluent obtained from the last hydrogenation reaction zone, and fractioning to obtain a diesel oil product with a low freezing point. The method reasonably combines the temperature decrease of the hydrodewaxing process and the temperature rise of the hydroupgrading process, so the diesel oil with a low freezing point is produced, the yield and the cetane value of the diesel oil are improved, the hot spot temperature of a device is reduced, and the running period is prolonged; and the consumption of cold hydrogen or the combustion gas loss of a heating furnace is reduced, so the operating cost is saved.

The invention discloses an ORC system and method for stepwise recycling low-grade heat and belongs to the field of energy saving. The system comprises a first pump (1), a second pump (5), a third pump (9), a first heat exchanger (2), a second heat exchanger (6), a third heat exchanger (10), a first gas-liquid separator (3), a second gas-liquid separator (7), a first expander (4), a second expander (8), a third expander (11), a mixer (12) and a condenser (15). The system belongs to a multistage organic Rankine cycle system and can efficiently and stepwise recycle a variable-temperature heat source; meanwhile, a pressure pump is arranged in front of each heat exchanger, so that better temperature matching in the heat exchange process of working mediums and the variable-temperature heat source is achieved, and available energy losses of the variable-temperature heat source can be effectively decreased. The system is suitable for recycling sunlight heat, geothermal energy, industrial waste heat, medium-low-temperature humid air and other low-grade heat energy.

The invention discloses a thermoelectric supercooling cross-critical CO2 heat pump combined heating system. An outlet of an evaporator is connected with an inlet of a compressor; an outlet of the compressor is connected with an inlet of the working medium side of a gas cooler; an outlet of the working medium side of the gas cooler is connected with an inlet of the cold end of a thermoelectric supercooling device; an outlet of the cold end of the thermoelectric supercooling device is connected with an inlet of a throttling valve; an outlet of the throttling valve is connected with an inlet of the evaporator; a heating water return outlet is connected with an inlet of the thermal end of the thermoelectric supercooling device; an outlet of the thermal end of the thermoelectric supercooling device is connected with an inlet of the heat exchange fluid side of the gas cooler; an outlet of the heat exchange fluid side of the gas cooler is connected with an inlet of a mixing tank; and an outlet of the mixing tank is connected with a heating water return inlet. According to the system, the throttling loss is reduced to a greater extent, the high pressure of CO2 operation is further reduced,the overall system efficiency of a CO2 heat pump is improved, the compression ratio of the compressor is reduced, the isentropic efficiency is improved, and the service life of the compressor is prolonged.

The invention discloses an ORC power generation system based on series connection of multistage evaporators. The system comprises n evaporators , wherein the n evaporators are connected in series sequentially on a heat source side; a heat source fluid enters a first evaporator, is discharged from a last evaporator and is recharged to the underground; a working medium side of each evaporator is connected to n inlets of a steam turbine; an outlet of the steam turbine is sequentially connected with a preheater and a condenser in series; a working medium enters the preheater and the condenser, and then enters the other side of the preheater again and exchanges heat with exhaust steam exhausted by the steam turbine after working; the working medium flowing out of the preheater enters n working medium pumps in a parallel connection manner, and the n working medium pumps are connected to the n evaporators correspondingly, so that the closed cycle of the working medium is formed; a cold source side of the condenser is connected to a cooling water circulation system; a plurality of evaporator heat source sides are in series connection; and the working medium side is directly connected with the steam turbine in parallel, so that the defect that a single evaporator in a conventional ORC system is irreversible and has large loss is overcome, and the utilization efficiency and the technical economy of the system are improved.

The invention discloses a triangular cycle and Rankine cycle combined waste heat recovery system and a method thereof. The waste heat recovery system comprises working medium pumps, evaporators, expansion machines and condensers. In a triangular cycle, a working medium enters the high-temperature cycle evaporator, absorbs heat, always maintains a liquid state, and then, enters the expansion machine to act, and waste steam after acting preheats a low-temperature working medium in a Rankine cycle in the high-temperature cycle condenser; and in the Rankine cycle, the working medium enters the high-temperature cycle condenser, is in heat exchange with waste steam in the triangular cycle, then, enters the low-temperature cycle evaporator, is in counterflow heat exchange with low-temperature tail gas which is already in heat exchange with the high-temperature working medium in the high-temperature cycle, and then, enters the low-temperature cycle expansion machine to act. According to the triangular cycle and Rankine cycle combined waste heat recovery system, the working medium isothermal heat absorption process in the traditional Rankine cycle in the high-temperature cycle evaporator can be eliminated in the triangular cycle, the temperature matching problem between a heat source and the working mediums is solved, energy loss of the system is reduced, and efficient recycling of waste heat of automobile tail gas is facilitated.

The invention discloses a component controllable two-stage condensation Rankine cycle power generation system utilizing LNG cold energy, and belongs to the field of liquefied natural gas cold energy power generation. The system comprises a first sea water pump, a second sea water pump, a first working medium pump, a second working medium pump, a mixer, a working medium evaporator, a membrane separation device, a first expansion machine, a second expansion machine, an LNG pump, a first-stage condenser, a second-stage condenser and a reheater. According to the system, step-by-step utilization ofthe LNG cold energy is realized; and the proportion of mixed working mediums in the two condensers can be regulated and controlled by the additionally arranged membrane separation device, the temperature matching degree in the heat exchange process can be further improved, the irreversible loss in the LNG cold energy recovery process can be reduced, the power generation efficiency is improved, meanwhile, the flexible applicability of the system under different working conditions is also improved, and therefore, the system can be widely applied to the field of LNG cold energy power generation.

The invention discloses an air source transcritical CO2 heat pump and a multi-melting-point phase change heat storage coupling heating system. The multi-melting-point phase change heat storage coupling heating system comprises a CO2 air source heat pump machine set, a first variable frequency pump, a high-melting-point phase change heat storage device, a user, a second variable frequency pump, a low-melting-point phase change heat storage device and a plurality of electromagnetic valves, wherein the secondary heat exchange side of a CO2 transcritical circular heat pump heating system is combined with the multi-melting-point phase change heat storage device; the low-melting-point phase change heat storage device is used for absorbing waste heat of return water, so that the temperature of the return water is reduced, and then the temperature of a working medium before a throttling valve and the throttling loss are reduced, thereby causing the temperature glide in the CO2 exothermic process to be in temperature matching with hot water very well and giving full play to the unique advantages of the CO2 transcritical circular heat pump heating system. In addition, when the peak value of electric power or the heat supply efficiency of the heat pump is relatively low, the system is switched into a heat release mode, and the heat of the phase change device is used for heat supply. The multi-melting-point phase change heat storage coupling heating system provided by the invention has the beneficial effects that the multi-melting-point phase change heat storage coupling heating system can operate and be controlled at different period of time during wave crest and wave trough of electric power, and then the comprehensive utilization performance of the heat pump machine set is improved.

A method of hydrocracking is disclosed. The method does not need any transformation on a hydrocracking device and only utilizes present procedures of the device. Passivation gas containing ammonia gas is injected into a catalyst bed layer through an inlet of a hydrocracking reactor to reduce reaction activity, the reaction temperature of a cracking catalyst is increased under the premise of not greatly changing product distribution, and the temperature of an outlet of a refining reactor and the temperature of an inlet of the cracking reactor are matched reasonably to the utmost. The method improves operation safety, flexibility and emergency incident responding capability of the device, avoids overtemperature, and reduces energy consumption of the device to a certain degree.

The present invention discloses a lubricating oil base oil production method. According to the lubricating oil base oil production method of the present invention, a wax oil raw material and hydrogen gas are mixed and then sequentially pass through at least two hydrogenation reaction zones connected in series, wherein each hydrogenation reaction zone sequentially comprises a composite catalyst bed layer filled with a hydrodewaxing catalyst and a hydrocracking catalyst in a mixed manner and a hydrodewaxing catalyst bed layer according to the material flowing direction, and the reaction effluent obtained from the last hydrogenation reaction zone is subjected to separation and fractionation to obtain the lubricating oil base oil, the white oil and other products. With the method of the present invention, the temperature decrease during the hydrodewaxing process and the temperature increase during the hydrogenation process are subjected to reasonable combination utilization, such that the low freezing point lubricating oil base oil is produced while the viscosity index is increased, the hot spot temperature of the device is reduced, and the operation period is prolonged; and the cold hydrogen consumption or the heating furnace fuel gas loss is reduced, and the operating cost is saved.

The invention discloses a power and cold air combined supply system driven by a medium and low temperature heat source. The power and cold air combined supply system comprises a medium and low temperature heat source circulation system, an LNG cold energy utilization circulation system, a Kalina circulation system, an organic Rankine circulation system, an external ejection type refrigeration circulation system and an internal ejection type refrigeration circulation system; the Kalina circulation system is coupled with the medium and low temperature heat source circulation system through a boiler and a superheater; the organic Rankine circulation system is coupled with the medium and low temperature heat source circulation system through an ORC preheater, and the organic Rankine circulation system is coupled with the Kalina circulation system through an ORC evaporator; an ejection flow of an ejector of the internal ejection type refrigeration circulation system is medium-high pressure ammonia gas led out from a certain position in the middle of a turbine in the Kalina circulation system, and the ejected flow is a two-phase flow of an outlet of a first evaporator; and an ejection flow of an ejector of the external ejection type refrigeration circulation system is ammonia water at an outlet of a condenser in the Kalina circulation system, and an ejected flow is a two-phase mixture at an outlet of an evaporator.

The preparation steps of swelling fire retardant by covering mill run and gangue of bauxite by resin is showed as follows: reacting mill run and gangue of bauxite orderly with phosphorous and nitrogenous materials in milling and thinning process, then drying, calcining and covering a Al-P-N composite on the surface of the mill run and the gangue grain; then covering the covered gangue orderly with resin prepolymer and phosphate to obtain resin covered mill run and gangue of bauxite; mixing and reacting the product with styrene, diethylene phenyl, methanol or butanol, filtering, washing, drying the final product to obtain the swelling fire retardant. The invention accomplishes the utilization of industrial castoff of mill run and gangue of bauxite with simple technics and low cost, which is prone to industrialization. The prepared fire retardant has a swelling property with a thermal decomposition temperature more than or equal to 230 deg C, having greater compatibility with high polymer.The swelling property can be adjusted by controlling the covering times according to application requests.

The invention provides a variable-concentration directly-heated type heat pump water heater with flash evaporators and a working method thereof. The variable-concentration directly-heated type heat pump water heater with the flash evaporators comprises a main circulation loop, an air supplementing branch and a concentration adjusting branch, and the main circulation loop is formed by connecting acompressor, a condenser, a high-pressure liquid storage device, a subcooler, a first expansion valve, the flash evaporator, a first stop valve, a third stop valve, a second expansion valve and an evaporator; the air supplementing branch is provided with the flash evaporator and a second stop valve which are connected in sequence; and the concentration adjusting branch is formed by connecting a working medium supplementing expansion valve, a component separation and working medium storage tank, an air supplementing concentration adjusting valve and a liquid supplementing concentration adjustingvalve. According to the variable-concentration directly-heated type heat pump water heater, based on the principle of advantage complementation, enhanced vapor injection and working medium concentration adjusting technologies are comprehensively applied to the heat pump water heater, the low-temperature performance and annual comprehensive energy efficiency of the heat pump water heater can be remarkably improved, meanwhile, the applicable temperature range of the heat pump water heater is obviously widened, and the heat pump water heater further has the advantages of being simple in rectification structure, high in component separation efficiency, safe, reliable and the like.

The invention provides an absorption, compression and ejection composite cascade supercooling transcritical CO2 combined cooling and heating system. The system is composed of a transcritical CO2 refrigeration cycle, an absorption, compression and ejection composite cascade supercooling cycle and a hot-end heat-supply cycle, the absorption, compression and ejection composite cascade supercooling cycle is subjected to cascade throttling depressurization, therefore, supercooling of two different evaporation pressures is realized, the CO2 fluid at the outlet of a CO2 gas cooler is subjected to twocontinuous cascade supercooling, so that better temperature matching is formed during the heat exchange process, and the heat transfer temperature difference is reduced, the heat exchange irreversible loss in a CO2 subcooling process is significantly reduced, the temperature of the CO2 fluid at the outlet of the gas cooler is reduced, the throttling loss of CO2 is reduced, the compression ratio of a compressor is reduced, the isentropic efficiency is improved, and then the COP of the system is improved. The combined cooling and heating system can be widely applied to various occasions needingrefrigeration or heating, such as refrigeration, medium-high temperature hot water making and heating.

A clothes drying system based on a carbon dioxide transcritical heat pump cycle system comprises a carbon dioxide transcritical heat pump cycle system, an air circulation system, a drying room, a control system and a system shell. A compressor, a gas cooler, a subcooler, a once throttling gear, a precooler, a secondary throttling gear, an evaporator and a liquid-gas separator are sequentially connected to form the heat pump cycle system through pipelines. A circulating fan, a gas cooler air inlet, a drying room air inlet, a filter, a precooler air inlet and an evaporator air outlet are sequentially connected to form the air circulation system through air ducts. The clothes drying system based on a carbon dioxide transcritical heat pump cycle system has the advantages of causing no harm to environment, being capable of providing wide temperature scope, suitable for different fabrics, and capable of reducing throttling loss of the carbon dioxide and improving circulation efficiency of the system.

The invention discloses an ammonia water working medium combined cooling heating and power system utilizing a medium-low temperature heat source and a working method thereof, and belongs to the technical field of medium-low temperature heat source recycling and power engineering. Ammonia water is adopted as a cycle working medium, Kalina cycle, ammonia water absorption refrigeration cycle and ammonia water absorption heat pump cycle are organically integrated to form the novel ammonia water working medium combined cooling heating and power system for the medium-low temperature heat source, andelectric energy, cold energy and heat energy can be provided for users. The system has three operation modes of power generation, cold power and heat power, for example, the power generation mode canbe operated in spring and autumn, the cold power mode can be operated in summer, and the heat power mode can be operated in winter in China. The system meets the requirements of users for different types of energy, gradient utilization of energy is achieved, and the energy utilization efficiency of the medium-low temperature heat source is improved.

The invention provides a direct heating type heat pump water heater with adjustable concentration and a wide temperature zone and a working method thereof. The water heater includes a main circulationloop, an air supplement branch and a concentration adjustment branch. The main circulation loop is provided with a compressor, a condenser, a high-pressure liquid accumulator, a subcooler, an economizer, a first expansion valve and an evaporator which are sequentially connected. The air supplement branch is provided with a second expansion valve, an economizer and a stop valve which are connectedsequentially. The concentration adjustment branch is composed of a working medium supplementary expansion valve, a component separation and working medium storage tank, an air supplement concentration regulating valve and a liquid supplement concentration regulating valve. The air jet enthalpy increase and working medium concentration adjustment technologies are comprehensively adopted, the significant improvement in the low-temperature performance of the heat pump water heater, significant expansion of the applicable temperature zone, and significant improvement in the overall energy efficiency throughout the year are simultaneously achieved. In addition, the water heater further has many advantages of simple distillation structure, high component separation efficiency, simple control, safety and reliability.

The invention provides an adsorption type refrigerating system and method based on cooking fume discharging equipment. The refrigerating system comprises a desorption and adsorption device used for adsorption and desorption of a refrigerant, a heat releasing device and a heat absorbing refrigerating device. The desorption and adsorption device comprises an adsorption bed device and a smoke exhaust hood. The adsorption bed device comprises at least one adsorption bed and is arranged in the smoke exhaust hood, and the desorption and adsorption device is used for refrigerant adsorption and desorption. The heat releasing device is connected with the desorption and adsorption device and used for condensation of the refrigerant desorbed by the desorption and adsorption device. One end of the heat absorbing and refrigerating device is connected with the heat releasing device so as to receive the refrigerant output by the heat releasing device, and the other end of the heat absorbing and refrigerating device is connected with the desorption and adsorption device so as to provide the refrigerant for the desorption and adsorption device. The adsorption bed device of the adsorption type refrigerating system based on the cooking fume discharging equipment is combined with the smoke exhaust hood, heat gathering is achieved through the characteristics that a gas collecting hood (the smoke exhaust hood) is large in area and gets close to a heat source, and the equipment occupied space is saved.

The invention discloses a CO2 transcritical thermodynamic cycle electricity storage system, which comprises a heat pump circulation loop, a heat storage unit and a cold storage unit, wherein the heat storage unit and the cold storage unit are connected to the heat pump circulation loop, the heat pump circulation loop converts a working medium in the heat pump circulation loop into a high-temperature and high-pressure supercritical state and sends the working medium into the heat storage unit, the heat storage unit is internally provided with multiple sections of heat storage media, and a high-temperature and high-pressure supercritical working medium enters the heat storage unit and sequentially exchanges heat with each section of the heat storage media at an approximately constant temperature difference, so that heat energy is stored in the heat storage media. The invention further provides an electricity storage method of the CO2 transcritical thermodynamic cycle electricity storage system. In the heat exchange process of the high-temperature-end cycle working medium and the heat storage medium, good temperature matching in the heat exchange process of the high-temperature-end cycle working medium and the heat storage medium is achieved through the segmented heat exchange technology of mass flow adjustment and phase change heat storage medium conversion, and the heat exchange efficiency and the overall efficiency of the electricity storage system are improved.

The invention discloses a full-heat-regeneration Brayton cycle and absorption type refrigeration integrated electricity and cooling combined supply system. The system comprises a supercritical carbon dioxide Brayton cycle power generation system, a pre-cooling-boiler coupling heat regeneration module and an absorption type electricity and cooling combined supply system. The supercritical carbon dioxide Brayton cycle system is combined with the absorption type electricity-cooling combined supply system, low-pressure high-temperature side outlet carbon dioxide waste heat of a low-temperature heat regenerator outlet is fully utilized, heat is provided for the absorption type electricity-cooling combined supply system in combination with the pre-cooling-boiler coupling heat regeneration system, low-temperature waste heat of the low-temperature heat regenerator outlet can be fully utilized, and the heat utilization rate of the low-temperature heat regenerator outlet is improved. And meanwhile, a large amount of cooling water and a precooler required by the Brayton cycle are omitted, the investment cost of the high-temperature heat regenerator and the low-temperature heat regenerator is reduced, and the power generation efficiency of the Brayton system is improved.

The invention discloses a two-stage transcritical Rankine cycle power generation system using geothermal energy and belongs to the field of geothermal energy power generation. The system comprises a low pressure working medium, a high pressure working medium, a preheater, a low pressure working medium heater, a high pressure working medium heater, a low pressure expander, a high pressure expander, a condenser, a separator and a mixer. The whole power generation process comprises two portions: low pressure transcritical Rankine cycle power generation and high pressure transcritical Rankine cycle power generation, so that the geothermal energy is fully utilized, the irreversible loss of the process is reduced, the exergy efficiency is greatly enhanced, the output power and thermal efficiency are further relatively high, and the system can be widely applied to the field of geothermal energy power generation.

The invention discloses a CO2 refrigerating and heating integrated system capable of performing mechanical assisted super-cooling through a non-azeotropic working medium. Non-azeotropic mixed steam compression cycle is combined with CO2 trans-critical cycle; the non-azeotropic working medium has temperature glide in a phase-change process; one path of return water flows through a condenser which is assisted by the non-azeotropic working medium to circulate, the other path of return water flows through a CO2-cycle gas cooler to heat, temperature difference of inlets and outlets of two paths ofwater is relatively small, and relatively good temperature matching is formed between an assisted-cycle non-azeotropic mixed working medium condensing process and a CO2 fluid cooling process. Very good temperature matching is formed between a non-azeotropic refrigerant evaporating process and a trans-critical CO2 fluid cooling process, heat-exchange irreversible loss in the condenser, a gas coolerand a cooling evaporator can be greatly reduced through a combined heating system, compressor input power can be reduced by recycling expansion work through an expanding machine, and efficient operation of CO2 refrigerating and heating integrated system is guaranteed.

The invention discloses a non-azeotropic working medium dual-stage organic flash evaporation circulation system and a heat energy recovery method thereof, and belongs to the field of energy recovery.A working medium exchanges heat with a waste heat medium in a heat exchanger after being pressurized by a working medium pump, and enters a high-pressure-stage gas-liquid separator after being throttled by a first throttle valve; a saturated steam after high-pressure-stage flash evaporation enters a high-pressure-stage turbine to do work through expansion, and saturated liquid is throttled again through a second throttle valve to change into a gas-liquid mixture; the gas-liquid mixture and exhaust gas are mixed in a high-pressure-stage mixer, and then enter a low-pressure-stage gas-liquid separator together; saturated steam after the low-pressure-stage flash evaporation enters a low-pressure-stage turbine to do work through expansion, saturated liquid is throttled through a third throttledvalve to change to a gas-liquid mixture, and the gas-liquid mixture and the exhaust gas are mixed in a low-pressure-stage mixer; and the gas-liquid mixture and the exhaust gas are jointly cooled in acondenser. The temperature matching between the circulation and a cold source is improved, the exergy loss caused by single-stage OFC direct throttling is reduced, the system efficiency is improved,and the stepwise efficient use of medium and low temperature thermal energy is realized.

The invention discloses a rectifying tower type variable concentration non-azeotropic working medium hot pump system and a running method, and belongs to the technical field of a hot pump air conditioner. The system mainly includes a compressor, a four-way valve, an outdoor heat exchanger, a flow direction switching device, a component regulating device, a stored fluid heat regenerator, a system expanding valve, an indoor heat exchanger, a three-way valve and a corresponding linking pipe. Through arranging the component separating tank, the system storage fluid heat regenerating tank, the corresponding linking pipe and the valve, the quasi-secondary-grade compression, fluid injection, concentration adjustment of system working medium and other functions can be realized. Through the comprehensive application of non-azeotropic working medium, gas supplementation, injection and component concentration adjusting technology, the hot pump system can improve the heating amount and COP of the hot pump under the low temperature condition, increase the seasonal efficiency level of the hot pump device, and effectively control the exhaust temperature of the low-temperature condition of the compressor.

The invention provides an ejector booster two-stage super-cooling trans-critical CO2 dual-temperature system and application. The ejector booster two-stage super-cooling trans-critical CO2 dual-temperature system comprises an ejector, booster, and dual-supercooler series mechanical super-cooling cycline and a trans-critical CO2 dual-temperature-region cycle, which can mutually exchange heat; the trans-critical CO2 dual-temperature-region cycle comprises a CO2 low-temperature-stage evaporator, an outlet of the CO2 low-temperature-stage evaporator sequentially communicates with a CO2 low-pressure-stage compressor, a CO2 medium-pressure-stage compressor, a CO2 high-pressure-stage compressor, a heating medium side of a CO2 gas cooler, a heating medium side of the medium-temperature-stage cooling evaporator, a heating medium side of a low-temperature-stage cooling evaporator, a medium-temperature-stage gas-liquid separator, a low-temperature-stage gas-liquid separator and an inlet of a CO2low-temperature-stage evaporator. The ejector booster two-stage super-cooling trans-critical CO2 dual-temperature system can reduce gas exhaust pressure of the compressor, reduces a pressure ratio ofthe CO2 compressor, improves isentropic efficiency, and prolongs the service life of the compressor.

The invention provides a multifunctional foamed aluminum foaming agent and a method for preparing foamed aluminum using the same. The foaming agent is copper sulfate or copper sulfate related derivatives or a mixture mainly comprising a copper sulfate component. According to the method for preparing the foamed aluminum using the multifunctional foamed aluminum foaming agent, the multifunctional foamed aluminum foaming agent which is 0.5%-20% mass of foamed aluminum material aluminum metal is added in the foamed aluminum preparation process, and the multifunctional foamed aluminum foaming agentcan be applied to a melt foaming method, a powder metallurgy method and a secondary foaming method for preparing the foamed aluminum. The foaming agent has good matching performance with foamed aluminum preparation foaming temperature, long sustained release time, good dispersibility, low cost and convenient use and has the functions of viscosity increasing and strengthening.

The invention discloses an ORC system and method for stepwise recycling low-grade heat and belongs to the field of energy saving. The system comprises a first pump (1), a second pump (5), a third pump (9), a first heat exchanger (2), a second heat exchanger (6), a third heat exchanger (10), a first gas-liquid separator (3), a second gas-liquid separator (7), a first expander (4), a second expander (8), a third expander (11), a mixer (12) and a condenser (15). The system belongs to a multistage organic Rankine cycle system and can efficiently and stepwise recycle a variable-temperature heat source; meanwhile, a pressure pump is arranged in front of each heat exchanger, so that better temperature matching in the heat exchange process of working mediums and the variable-temperature heat source is achieved, and available energy losses of the variable-temperature heat source can be effectively decreased. The system is suitable for recycling sunlight heat, geothermal energy, industrial waste heat, medium-low-temperature humid air and other low-grade heat energy.