25 results about "Transcritical cycle" patented technology

The invention discloses a CO2 transcritical refrigeration system recooling gas-liquid separation device and method, two-stage throttling is adopted, and a recooler and a gas-liquid separator are arranged after first-stage throttling. The recooler takes low-temperature saturated gas shunted from an outlet of the evaporator as a cold source to cool a two-phase mixture subjected to primary throttling; saturated liquid separated by the gas-liquid separator enters the evaporator after being subjected to secondary throttling, and saturated gas flows back to an inlet of the recooler. On the basis of two rigid constraints, namely evaporation pressure reference and charge volume fixation, the equivalent condensation pressure which is physically locked is introduced into the transcritical cycle for the first time, so that the system obtains fixed high-pressure reference. Thermodynamic derivation shows that the recooling ratio is determined by evaporation pressure and uniqueness, and the operation is completely physically adaptive. Simulation results show that the COP under the air conditioner working condition reaches 3.038, is improved by 38.2% compared with that of a basic system and is superior to that of an existing split-flow supercooling technology (17.62%). The compressor only needs to maintain simple frequency modulation of evaporation pressure without a complex algorithm. The device is suitable for CO2 transcritical systems such as air conditioners, heat pumps and freezing and refrigerating.

The application provides a biogas plant internal combustion engine waste heat and LNG cold energy comprehensive utilization power generation system and method, the system comprises a transcritical CO2 cycle device, an LNG heating expansion device and a biogas internal combustion engine device, CO2 generated by combustion of the biogas internal combustion engine device is stored in a CO2 liquefaction storage tank after liquefaction treatment, and biogas generated by the biogas plant is stored in an LNG liquefaction storage tank after treatment; CO2 output by the CO2 liquefaction storage tank is pressurized to supercritical pressure, then heated and expanded in a first turbine expander to generate power, and LNG output by the LNG liquefaction storage tank is pressurized, then heated and expanded in a second turbine expander to generate power, and the heat for heating comes from flue gas generated by the biogas internal combustion engine device. The application effectively utilizes multi-grade energy existing in the biogas plant, improves energy efficiency and power output capacity, increases power production, reduces CO2 emission and has good economic benefits.

The invention relates to the technical field of heat pump systems, and discloses a transcritical cycle-based heat pump waste heat recovery system, which comprises a compression module, a heat exchange scheduling module, a phase state separation module, a flow control module, a heat absorption module and a flow path topology control module, according to exhaust pressure and exhaust temperature parameters of a compression module, rehearsing a candidate communication state to generate a target communication feature set, calculating a configuration transition deviation value of the target communication feature set relative to a current communication feature set, determining a physical switching constraint weight and introducing thermodynamic efficiency evaluation logic, and when an evaluation result meets a migration criterion, determining a physical switching constraint weight; according to the method, the physical deviation cost of flow path configuration transition is quantified, dynamic matching of a refrigerant heat release track and a heat source side temperature gradient field is achieved, the problem of heat transfer temperature difference distortion is solved, and disordered oscillation of a physical flow path is restrained.

The invention belongs to the technical field of ship power and distributed energy, and particularly relates to a marine cogeneration system based on a compact reformer and an application method. The system comprises a combined heat and power supply module and a transcritical CO2 circulation module, the combined heat and power module converts chemical energy of gas fuel into electric energy and generates combustion tail gas. And the transcritical CO2 circulation module recovers and utilizes the waste heat of the combustion tail gas to generate power. Through deep coupling of the heat and power cogeneration module and the transcritical CO2 circulation module, the defects that in the prior art, a pre-reformer and a rear combustor are structurally separated, the system size is large, and the heat and mass transfer path is long are overcome, and the problems that in the prior art, the high-grade waste heat utilization rate is low, and the comprehensive energy efficiency of the system is not high are solved. And collaborative optimization of system miniaturization, multi-stage efficient utilization of energy and extremely low emission is realized.

The invention belongs to the technical field of refrigeration, air conditioners and heat pumps, and particularly relates to an air source CO2 transcritical cycle heat pump unit which comprises a CO2 compressor, an air cooler, a heat pipe type recooler, an integrated evaporator / condenser and a throttling valve. The exhaust end of the CO2 compressor is connected with a first inlet of the air cooler through a pipeline, a first outlet of the air cooler is connected with a first inlet of the heat pipe type recooler through a pipeline, and a first outlet of the heat pipe type recooler is connected with an inlet of the throttling valve through a pipeline. An outlet of the throttling valve is connected with a first inlet of the integrated evaporator / condenser through a pipeline, the heat exchange advantage of a pseudo-critical temperature point in the air cooler is kept, the temperature of transcritical CO2 in front of the throttling valve is reduced through deep cooling of the heat pipe type recooler, and therefore throttling losses are reduced; and meanwhile, heat released by the system is recycled and used for preheating air in front of the evaporator, and the overall efficiency of the system is improved.

The utility model provides a transcritical cycle-based multi-energy combined supply system. The transcritical cycle-based multi-energy combined supply system comprises a clean energy utilization system, an energy storage system, a supercritical medium power generation system, a supercritical medium refrigeration system, a combined heat and power generation system and a control system, the supercritical medium power generation system comprises a first gas-liquid separator, a compressor and a high-pressure turbine; the output end of the heat storage system is connected with the input end of the first gas-liquid separator, the energy storage medium output end of the first gas-liquid separator is connected with the input end of the combined heat and power generation system, the supercritical medium output end of the first gas-liquid separator is connected with the first input end of the compressor, and the first output end of the compressor is connected with the input end of the high-pressure turbine. The second output end of the compressor is connected with the supercritical medium input end of the cold storage system. According to the scheme, through coupling application of a supercritical medium technology and an energy storage medium heat storage technology, a comprehensive energy service system integrating efficient energy conversion, flexible energy storage adjustment and multifunctional cooling, heating and power supply is constructed.

The invention discloses a novel structural form brazed plate heat exchanger for a transcritical CO2 heat pump water heater, which adopts an integrated brazed structure to replace the traditional sealing gasket design aiming at the requirements of high pressure (8-12MPa), supercritical state physical property mutation, pseudo-critical zone specific heat capacity peak value and high flow rate of CO2 transcritical cycle. The heat exchange efficiency of an existing herringbone corrugated plate type heat exchanger is improved by optimizing the corrugated form of the plate sheets and the sectional layout of the flow channels to adapt to the CO2 characteristic. The novel brazed plate type heat exchanger specifically comprises a plate sheet main body, fluid inlet and outlet corner holes and a heat exchange area are formed in the plate sheet main body, and high-pressure corrosion resistant metal plate sheets form a leakage-free plate bundle through braze welding. The surface of the plate sheet is provided with a sectional corrugated structure (the inclination angle of a high-temperature section is 40 degrees, the inclination angle of a medium-temperature section is 50 degrees, the inclination angle of a low-temperature section is 60 degrees, and a hollow turbulent flow column is additionally arranged), and each temperature section is matched with the physical property change in the CO2 supercritical condensation process; the reinforcing ribs and the brazing grooves are arranged on the edges of the sheets, so that the overall compression strength is improved. The structure solves the problems that a traditional heat exchanger is insufficient in pressure resistance, and the heat exchange efficiency is not matched with the CO2 physical property, and is suitable for a transcritical CO2 heat pump system.

According to the photovoltaic panel heat dissipation system and method coupled with the supercritical carbon dioxide heat pump, efficient thermal coupling is carried out on the photovoltaic module back plate and the micro-channel integrated heat exchanger at the evaporation end of the supercritical carbon dioxide heat pump, and a transcritical cycle working medium is utilized; a large amount of waste heat generated during operation of a photovoltaic panel is actively absorbed and transferred, so that the working temperature of the photovoltaic panel is remarkably reduced to 45-55 DEG C so as to improve the power generation efficiency by 10%-15%, meanwhile, the captured low-grade waste heat is upgraded into medium-high-grade heat energy at the temperature of 60-90 DEG C through heat pump circulation to be output and utilized, cooperative operation of photovoltaic power generation and waste heat recovery and quality improvement is achieved, and the power generation efficiency is improved. The comprehensive energy efficiency of the system exceeds 70%, the heating performance coefficient of the heat pump reaches 3.2-3.8, photovoltaic self-power-generation driving is mainly used, and the system has multiple benefits of reducing carbon emission, prolonging the service life of components and adapting to various heat using scenes.

The application belongs to the technical field of ship power and distributed energy, and particularly relates to a marine combined heat and power system based on a compact reformer and an application method. The system comprises a combined heat and power module and a transcritical CO2 cycle module. The combined heat and power module converts the chemical energy of gaseous fuel into electric energy and generates combustion tail gas. The transcritical CO2 cycle module recovers and utilizes the waste heat of the combustion tail gas to generate power. The application overcomes the defects of the separation of the pre-reformer and the after-burner structure, the large system volume and the long heat and mass transfer path in the prior art, solves the problems of low high-grade waste heat utilization rate and low system comprehensive energy efficiency in the prior art, and realizes the collaborative optimization of system miniaturization, multi-stage efficient energy utilization and extremely low emission.

The application discloses a multifunctional carbon dioxide cycle test system, which is composed of a buffer tank, a main compressor, a condenser, a pump, a re-compressor, a low-temperature regenerator, a high-temperature regenerator, an electric heater, a turbine, a pre-cooler and valves. Valves are arranged in front of and behind the main compressor, and valves are arranged in front of the condenser and behind the pump, so that supercritical cycle test and transcritical cycle test can be carried out. The main compressor and the re-compressor are arranged at the same time, the main compressor and the re-compressor can be operated at the same time to carry out combined test, the re-compressor is isolated, and simple regenerative cycle test can be carried out independently. The main compressor loop and the re-compressor loop are arranged, and the main compressor test and the re-compressor test can be carried out independently. The turbine is provided with a bypass pipeline and a valve, and the regenerator test can be carried out independently.

The invention relates to a carbon dioxide refrigeration and heating and negative pressure defrosting water recovery process method for a freeze dryer. According to the process method, a gas cooler, a heating plate group, a heating medium pump and the like of a carbon dioxide heating part are included; the carbon dioxide refrigeration part comprises a low circulation barrel, a refrigerant pump, a cold trap, an air cooler and the like; supercooling the common part and the like; and the negative-pressure defrosting water recovery part comprises a negative-pressure steam generator, a drainage pump, a recovery water tank and the like. The method is characterized in that an environment-friendly working medium is selected, a carbon dioxide transcritical cycle technology is adopted, the excellent low-temperature refrigeration performance and the transcritical temperature slippage heat exchange characteristic of carbon dioxide are fully utilized, the effect that the COP of both refrigeration and heating of a reverse Carnot cycle is larger than 1 is exerted, the freeze-drying refrigeration and heating processes are combined into one, heating equipment with the COP smaller than 1 and power consumption are omitted, and the cost is reduced. Therefore, the super effect that the comprehensive COP is greater than 6 is achieved; the negative pressure defrosting technology is adopted, a low-quality heat source of the system is fully utilized, complete recovery of pure plant raw material water is achieved, and the raw material utilization rate is close to 100%.

The application provides a kind of carbon dioxide new energy vehicle heat pump system based on ejector circuit, relating to new energy automobile air conditioning technical field, including circulation module, for relying on CO2 transcritical cycle characteristics;Power and heat exchange module, for compressing low-temperature and low-pressure carbon dioxide refrigerant into high-temperature and high-pressure state;Loop control and ejection enhancement module, for controlling the flow direction and state of refrigerant;Gas-liquid separation and oil return module, for receiving gas-liquid mixed refrigerant from the ejector through the gas-liquid separator, realizing gas-liquid separation through gravity settling, and realizing oil return through oil return pipeline;State detection and repair module, for real-time acquisition of operating parameters of key nodes of the system, and intelligent repair using fault strategy library.

This application discloses a highly integrated thermal management method using R744 refrigerant, relating to the field of thermal management technology. The method includes the following steps: constructing a transcritical circulation loop based on R744 refrigerant, and sequentially arranging a compressor, gas cooler, gas-liquid separator, and high-pressure plate heat exchanger within the transcritical circulation loop; simultaneously configuring a power battery water circulation loop, an air conditioning water circulation loop, and an electric drive waste heat recovery loop; and forming a multi-loop switchable fluid path structure through a four-way valve, a three-way proportional valve, and multiple water pumps; utilizing the high-pressure plate heat exchanger as a multi-loop heat exchange node. This application achieves priority heat distribution across multiple loops through valve control, ensuring stable heat dissipation of the electric drive system at high temperatures and improving heating capacity and battery performance at low temperatures; simultaneously, it improves structural compactness and reliability through modular water circuit design, and utilizes waste heat to reduce energy consumption and refrigerant usage, thereby improving overall vehicle efficiency and safety.

The application relates to the field of compressor control, in particular to a two-stage air-supply enthalpy-increasing compressor control method based on a carbon dioxide transcritical cycle. The method comprises the following steps: acquiring a set of real-time running state information of a vehicle, based on which, multi-dimensional system state representation and optimal target fusion analysis are carried out to generate a dynamic optimal exhaust pressure target value; based on the dynamic optimal exhaust pressure target value, dynamic coupling and decoupling of a main control channel and an auxiliary control channel and collaborative instruction distribution are carried out to generate a set of collaborative control instruction information of the compressor and an electronic expansion valve; based on the set of collaborative control instruction information, feedforward prediction compensation and timing inertia smoothing management are carried out in combination with measurable disturbance information to generate a set of final actuator driving instruction information after disturbance smoothing; and based on the set of final actuator driving instruction information, safety driving instructions and parameter online fine adjustment learning are carried out to generate a set of two-pole compressor control optimization information. In the compressor control process, the application can maintain the optimal efficiency and pressure stability of the system under transient conditions.

The invention discloses a dehumidification system based on transcritical CO2 circulation and a closed air path and a control method. The dehumidification system comprises a transcritical CO2 heat pump subsystem and a closed regeneration air path subsystem. The transcritical CO2 heat pump subsystem comprises a compressor, an air cooler, an expansion valve and an evaporator which are sequentially connected through pipelines and form a circulation loop. The closed regeneration air path subsystem comprises a dehumidification rotating wheel regeneration area, a regeneration fan and an auxiliary radiator, and the dehumidification rotating wheel regeneration area, the regeneration fan and the auxiliary radiator are connected with the circulation loop. The system has the beneficial effects of high efficiency, energy conservation, great reduction of operation cost, environmental protection, meeting of green development requirements, deep dehumidification, stable operation and reduction of installation and operation and maintenance difficulty.

The invention discloses a distributed gas-liquid separation system which comprises an outdoor unit and at least two tail ends, a distributed gas-liquid separation unit is independently arranged at the front end of each tail end or the front end of each group of tail ends, and each unit comprises a first-stage throttling valve, a recooler, a gas-liquid separator and a second-stage throttling valve. According to the system, the high-pressure side state is independently locked through all the distributed units, and it is ensured that the working medium entering the second-stage throttling valve is saturated liquid. The system is suitable for subcritical and transcritical cycles, and is used for multi-split air conditioners, direct expansion air conditioners, heat pump water heaters, refrigeration equipment, electric automobiles, energy storage temperature control, rail transit, temporarily-built facilities, mobile air conditioners and the like. The distributed configuration solves the problem of unbalanced pressure of long piping and multiple branches, eliminates the most unfavorable end effect, and improves the action range and installation flexibility. And single-machine exclusive configuration, grouping sharing configuration or segmented sharing configuration can be selected, so that optimal balance between performance and cost is realized. The household metering module based on the dryness physical reference can achieve accurate measurement of cold and heat, and the fair charging requirement is met.

The application discloses a multi-domain coupled thermal management system of an electric vehicle based on a transcritical CO2 cycle and relates to the technical field of power battery thermal management. The thermal management system comprises a refrigerant circuit, a battery pack cooling liquid circuit, a motor cooling liquid circuit and an electric control unit, the electric control unit is connected with each circuit respectively, the refrigerant circuit, the battery pack cooling liquid circuit and the motor cooling liquid circuit are connected through the communication position change of a plurality of valves, and a cooling process, a heat supply process and a waste heat utilization process are formed. Through the coupling design of the refrigerant circuit and the battery pack and the motor double cooling liquid circuits, the application realizes the all-domain multi-mode temperature control collaborative management of the passenger compartment, the battery and the motor, can match the extreme working condition requirements from low-temperature cold start to high-temperature fast charging, and further builds a multi-stage waste heat recovery system for improving the comprehensive utilization efficiency of waste heat and further relieving the problem of the endurance attenuation of the electric vehicle in a low-temperature environment.

The application discloses a transcritical CO2 cycle power generation system, which comprises a transcritical CO2 cycle system, a turbine generator, a heat exchange system and a temperature control machine. The transcritical CO2 cycle system comprises a working medium inlet and a working medium outlet. The working medium outlet of the turbine generator is communicated with the working medium inlet. The turbine generator is communicated with an external power grid through a low-voltage power grid. The working medium three-way valve of the heat exchange system is communicated with the working medium outlet. Two outlet ends are respectively communicated with a working medium injection inlet through a heater and a phase change energy storage array. The heat source outlet of the temperature control machine is respectively communicated with the phase change energy storage array and the heat source inlet end of the heater through a heat source three-way valve. The temperature control machine and the heat source three-way valve are respectively configured to adjust the heat source temperature and the heat source flow rate injected into the phase change energy storage array and the heater according to the power demand of the external power grid, so as to adjust the heat source flow rate and the heat source temperature injected into the heater, thereby adjusting the heat absorbed by the CO2 liquid working medium injected into the turbine generator, and adjusting the power generation capacity of the turbine generator, so as to adapt to the change of the power demand of the external power grid.

The invention discloses an industrial steam / cold water combined supply system based on a transcritical CO2 circulation technology and a control method, and belongs to the technical field of industrial high-temperature heat pumps. The system comprises a transcritical CO2 ultra-high temperature heat pump subsystem, a steam generation subsystem and a chilled water generation subsystem. The combined cooling and heating design is adopted, ultrahigh-temperature steam is generated, configured and produced through innovative graded steam, and meanwhile industrial refrigeration is provided; two operation modes with the reheater and without the reheater are designed, and automatic switching can be achieved according to the requirement of a user for the steam quality; the CO2 working medium adopts the arrangement that an expansion machine is connected with an electronic expansion valve in series on the expansion side, and part of expansion work is recycled to improve the system performance coefficient. In addition, through a step-by-step and hierarchical cooperative control method, steam parameters are accurately controlled, and key parameters of system circulation are optimized, so that efficient co-production of ultra-high-temperature steam and industrial cooling capacity is achieved, the energy utilization efficiency is remarkably improved, and important industrial application value is achieved.

The utility model discloses a water quenching heat energy utilization system for lead-zinc volatile kiln slag. The water quenching heat energy utilization system comprises a hot water conveying pipeline, a filter, a CO2 transcritical cycle heat pump, an air conveying pipeline, a cylindrical dryer and a material conveying device, a water inlet of the filter is connected with a water outlet of the water quenching pool through a hot water conveying pipeline, and a water outlet of the filter is connected with a water inlet of the CO2 transcritical cycle heat pump through a pipeline, so that normal-temperature air entering the CO2 transcritical cycle heat pump is heated by utilizing heat energy of hot water discharged from the water quenching pool; an air outlet of the CO2 transcritical cycle heat pump is connected with a feeding port of the cylinder dryer through an air conveying pipeline so that wet zinc leaching residues entering the cylinder dryer can be pre-dried through hot air, a discharging port of the cylinder dryer is connected with the material conveying device, and the material conveying device is connected with a material inlet of the lead-zinc volatilization kiln. The wet zinc leaching residues are preheated and dried through heat energy carried by hot water generated through water quenching, the energy utilization rate is increased, and fossil energy consumption is reduced.

The invention discloses a mixed working medium refrigeration heat pump system and a control method. The heat pump system comprises a transcritical cycle structure and an adsorption and desorption mass transfer process unit. The critical cycle structure comprises a compressor, an oil separator, an oil return valve, a gas cooler, a back pressure valve, a gas-liquid separator, an electronic expansion valve and an evaporator which are connected with one another; the adsorption and desorption mass transfer process unit comprises a first pressure regulating valve, an adsorption and desorption device and a second pressure regulating valve which are connected with one another; a working medium inlet of the gas cooler is connected with a working medium outlet of the gas cooler through a first communicating pipeline, and a first coil pipe wound on the outer surface of the adsorption and desorption device is arranged in the first communicating pipeline; and a working medium inlet of the evaporator is connected with a working medium outlet of the evaporator through a second communicating pipeline, and a second coil pipe wound on the outer surface of the adsorption and desorption device is arranged in the second communicating pipeline. The performance of the refrigeration heat pump system can be remarkably improved through the component proportion in the mixed working medium and the exhaust pressure of the compressor.

The invention discloses a transcritical carbon dioxide coupling circulation system and device and a control method, and relates to the technical field of refrigeration and heat energy. The system comprises a compressor unit for compressing input low-temperature and low-pressure gaseous CO2 into high-temperature and high-pressure transcritical CO2, and a first cooling device for cooling the high-temperature and high-pressure transcritical CO2; the first CO2 heat exchanger group is used for carrying out coupling heat exchange on the low-temperature low-pressure liquid CO2 and the high-temperature high-pressure liquid CO2; and the second CO2 heat exchanger group is used for carrying out coupling heat exchange on the low-temperature low-pressure liquid CO2 and the low-temperature high-pressure liquid CO2. According to the technical scheme, the refrigerating capacity and the refrigerating coefficient of the transcritical COcirculation system can be remarkably increased, the heat energy utilization rate can be increased in the heating aspect, and energy consumption is reduced. Wide application of the transcritical COC cycle technology in the field of refrigeration and heat supply is promoted, and good environmental protection benefits and social benefits are achieved.

The present specification relates to the technical field of industrial heat pump, and particularly relates to a transcritical CO2 cycle system capable of realizing 120 DEG C high-temperature heat tracing of petroleum process and a control method thereof. The cycle system comprises a water pump, a gas cooler, an air source evaporation component, a waste heat superheater and a compressor; the gas cooler, the air source evaporation component, the waste heat superheater and the compressor are sequentially connected, and the water pump is connected with the gas cooler; the water pump is used for providing water to be heated to the gas cooler; the gas cooler is used for heat exchange between supercritical carbon dioxide working medium and the water to be heated; the air source evaporation component is used for heat exchange between an external environment and carbon dioxide working medium output by the gas cooler; the waste heat superheater is used for heat exchange between waste heat resources and carbon dioxide working medium output by the air source evaporation component; and the compressor is used for compressing carbon dioxide working medium output by the waste heat superheater to obtain supercritical carbon dioxide working medium. The embodiment of the present specification can improve the temperature and stability of heat supply.

The invention discloses a parallel compression refrigeration system and method based on carbon dioxide transcritical cycle, and belongs to the technical field of parallel compression refrigeration, the parallel compression refrigeration system comprises a main cycle unit, a separation unit and a refrigeration unit, in the main cycle unit, low-temperature and low-pressure steam from an evaporator is subjected to preheating and low-temperature stage compression, and is mixed with exhaust of a parallel compressor for primary cooling; in the separation unit, CO2 is separated by the flash barrel, saturated liquid at the bottom is throttled by an ejector and returns to an evaporator for refrigeration to form a main refrigeration loop, and flash gas at the top is sucked by a parallel compressor; in the refrigeration unit, the flash gas is sucked by the parallel compressor and compressed to main circulation with the same pressure; according to the transcritical heat pump system, part of originally lost pressure energy is recycled, so that the power consumption of the compressor is reduced, the power capability of fluid is improved, and finally, the refrigeration coefficient of the whole transcritical heat pump cycle is remarkably improved.

The utility model discloses a CO2 transcritical cycle compressor performance test device. A refrigerant outlet of a tested compressor is connected with an inlet of an exhaust throttle valve; an inlet of the oil separator is connected with an outlet of the exhaust throttle valve, a refrigerant outlet is connected with a first inlet of the heat regenerator through the first metering piece, and a refrigeration oil outlet is connected with a refrigerant inlet of the tested compressor sequentially through the second metering piece, the oil cooler and the third valve. A first outlet of the heat regenerator is connected with a condenser inlet, and a second outlet is connected with a heater inlet; an outlet of the condenser sequentially passes through a liquid storage device, a subcooler, a drying filter, a third metering part and a first valve and then is connected with a second inlet of the heat regenerator, so that refrigerants in high-pressure side systems from the exhaust throttle valve to the first valve and from the exhaust throttle valve to the second valve are in a subcritical state; the third metering piece is connected with the heater through the second valve; the heater is connected with a refrigerant inlet of the tested compressor. According to the utility model, the performance test can be carried out according to a subcritical test mode, and the withstand voltage requirement and the manufacturing cost of the device can be reduced.