175 results about "Thermodynamic cycle" patented technology

The embodiment of the invention provides a compressor performance evaluation method and device, electronic equipment and a storage medium, and belongs to the technical field of refrigeration. The method comprises the following steps: constructing a thermodynamic cycle flow of the compressor under each preset condition according to a compression process of the compressor under a plurality of preset conditions; for each preset condition, based on the thermodynamic cycle flow of the compressor under the preset condition, a mathematical model of the compressor under the preset condition is constructed, and the mathematical model comprises a plurality of target performance parameters used for evaluating the performance of the compressor; fitting the mathematical model of the compressor under the preset condition with the thermophysical parameters of the refrigerant of the compressor to obtain the value of each target performance parameter of the compressor under the preset condition; and performing performance comparison evaluation on the values of the multiple target performance parameters of the compressor under each preset condition to obtain an evaluation result. According to the embodiment of the invention, the compressor performance can be quantitatively evaluated.

The invention belongs to the field of aircrafts, relates to an aircraft power system design technology, and provides an aero-engine of a contra-rotating blade configuration and a control method, and the aero-engine comprises a gas turbine engine, contra-rotating blades and a main transmission shaft. The gas turbine engine is located in the main flow channel, the contra-rotating blades are arranged in the additional duct, an inlet adjusting piece is arranged at the inlet position of the additional duct, and an outlet adjusting piece is arranged at the outlet position of the additional duct. One end of the main transmission shaft is selectively connected or disconnected with the gas turbine engine through a clutch, and the other end of the main transmission shaft is connected with the contra-rotating blades through a connecting structure. Through the innovative power architecture design, the core problem that the thermodynamic cycle efficiency and the thrust characteristic of a traditional aero-engine under the complex flight working condition are difficult to dynamically adapt is solved, the bypass ratio is adjusted through the external contra-rotating blades, multi-working-condition self-adaptive optimization is achieved, and the reliability of the aero-engine is improved. Therefore, the aircraft power system can efficiently and reliably operate in a wide-area complex environment.

The invention discloses a coupled thermal power cycle system, which relates to the technical field of energy application, and effectively realizes coupling of an organic Rankine cycle module and a Brayton cycle module in fusion reactor heat source application by inputting an expanded first working medium and a deoxygenated second working medium into a heat exchanger module for heat exchange. On one hand, the temperature of the first working medium can be reduced through heat transfer to reduce the cooling cost of the first working medium, and on the other hand, heat in the Brayton cycle module can be utilized to reduce generation of waste heat. In addition, the organic Rankine cycle module has a reheating stage, and the energy conversion efficiency of the coupled thermal power cycle system can be effectively improved. In addition, the parameters of the coupled thermal power circulation system are set based on the enthalpy value, and the system heat efficiency can be further improved.

The invention provides a heat-electricity coupling driven indirect cooling and heat regeneration mixed exhaust turbofan engine, and belongs to the technical field of aero-engines, the heat-electricity coupling driven indirect cooling and heat regeneration mixed exhaust turbofan engine comprises an engine body, and an indirect cooling and heat regeneration heat exchange system, a transmission system and an electric propulsion system are arranged in the engine body; the electric propulsion system is connected with the transmission system and drives the transmission system to do work, the transmission system and the electric propulsion system are both arranged at the middle section position of the engine body, and the indirect cooling heat regeneration heat exchange system is arranged at the head section position and the tail section position of the engine body. According to the heat-electricity coupling driven intercooling regenerative mixed exhaust turbofan engine, the solid oxide fuel cell is introduced, so that the thermodynamic cycle effective work of the engine is increased, the overall energy utilization rate of a propulsion system is remarkably improved, an optimal power supply degree design value interval is provided, and the power supply degree design value interval is optimized. And a design reference basis is provided for reasonable thermal-electric energy distribution of the corresponding propulsion system configuration in the design stage.

The invention relates to the technical field of automatic control theory application and data center thermal management, and discloses a data center emergency refrigeration control method based on state space model prediction, which comprises the following steps: establishing a thermodynamic cycle state space equation; the refrigeration flow set value change rate and the water return side pressure change amount are obtained, and the dynamic heat exchange sensitivity is determined; monitoring feedback current characteristics of the driving unit, inverting cooling path resistance distribution and updating gain matrix elements; calculating a state prediction information sequence according to the temperature vector prediction deviation, and adjusting a time domain step length; the dynamic heat exchange sensitivity is introduced into prediction logic, controlled variable dynamic pressure retardation is compensated, an emergency refrigeration frequency control instruction is output, fluid fluctuation is converted into sensitivity compensation of a logic level, non-linear dynamic pressure damping of the emergency working condition is effectively impacted, the problems of control overshoot and logic instability caused by physical lag are solved, and the reliability of the system is improved. And the refrigeration response precision at the emergency conversion moment is improved.

Various examples are provided related to airlift pumping of downhole geothermal fluids. In one example, an airlift system includes a compressor; a gas sparger head in a wellbore of a geothermal well, and a pressure head recycle assembly. The sparger head produces artificial lift of the geothermal fluids by injecting a gas resulting in a difference in density downhole. The entrained gas can be extracted by the pressure head recycle assembly, compressed, and reinjected downhole. The geothermal fluid at the well head can be used in direct use applications or in a thermodynamic cycle to make shaft power. The gas sparger head can include a venturi shaped passage extending through the gas sparger head and a bubble orifice including gas orifices radially spaced about a narrow portion of the venturi shaped passage. The gas orifices can have a corresponding resonant chamber through which the gas (e.g., air) is provided.

The invention discloses an independent unit structure of a high-voltage solid heat accumulator and a thermodynamic cycle system of the independent unit structure. An independent unit is composed of the solid heat accumulator, an electric heating body, a series connection conductive band, a parallel connection conductive band, an insulation foundation, a porcelain insulator, an equipment foundation, an upper heat preservation layer, a connection electrode, a null line electrode and an outer sleeve. Insulation porcelain bottles are uniformly arranged on an equipment foundation in an array mode, an insulation foundation is arranged on the upper portions of the insulation porcelain bottles, a solid heat accumulator is installed on the insulation foundation, and an upper heat preservation layer is arranged on the top of the solid heat accumulator. The two ends of the plurality of electric heating bodies are connected with the parallel conductive bands arranged on the vertical surfaces of the solid heat accumulator to form a parallel group, and the parallel group is connected with the series conductive bands arranged on the two corresponding vertical surfaces of the solid heat accumulator; according to an independent unit structure, the electric heating bodies form an angle connection form or a star connection form through a series connection conductive band and a parallel connection conductive band, and the connecting electrodes are externally connected to an A-phase power supply, a B-phase power supply and a C-phase power supply of the power supply switch through an external sleeve.

The invention relates to the technical field of aero-engines, and discloses an efficient thermal protection hybrid thermodynamic cycle combined engine and a control method thereof.The combined engine composed of an external rotary detonation engine and an internal turbine engine is adopted, and modal switching of the combined engine is achieved through an inlet adjusting valve and an adjustable exhaust nozzle; the working upper limit of a turbine engine can be effectively joined, power relay can be completed, so that a thrust gap is spanned, the structural design complexity is relatively low, the system stability is relatively high, and in a stress application rotating detonation mode, the reliability is high. Combustible mixtures sprayed by the rotary detonation engine are guided into the afterburner of the turbine engine through the afterburner diverter valve for detonation combustion, an original cooling device of the afterburner is used for thermal protection, and an outer casing is prevented from being damaged due to high temperature.

The invention belongs to the field of turbine engines, and provides a thermodynamic cycle parameter obtaining method and system for a low-cost configuration turbine engine, and the method comprises the steps: determining an engine configuration through a cost design target of the turbine engine; according to the engine configuration, a thermodynamic cycle parameter feasible region is obtained with overall performance indexes and a fan inlet size threshold value as constraints, and the overall performance indexes comprise a thrust index and an oil consumption rate index; thermodynamic cycle parameters are determined in the feasible region of the thermodynamic cycle parameters through turbine engine performance requirements and turbine engine air inlet distortion resistance. According to the method, the thermodynamic cycle parameters can be rapidly obtained without repeated iteration, and the design period is greatly shortened.

The invention discloses an air cooling machine power enhancement potential quantitative estimation method, and belongs to the technical field of engine power estimation. The air cooling machine power strengthening potential quantitative estimation method comprises the steps that air cooling machine performance parameters, a heat engine state reverse dragging cylinder pressure curve and a heat release rate curve are obtained; a one-dimensional simulation model of the air cooler is established, and thermodynamic cycle gas state parameters of the air cooler are obtained; establishing a three-dimensional combustion simulation model, and calculating the thermodynamic state of gas in a combustion chamber in a compression stage after an intake valve is closed; establishing a three-dimensional structure simulation model of the air cooling machine cylinder part; the three-dimensional combustion simulation model is adopted for oil gas chamber optimization, heat-mechanical load verification is carried out on all parts, and the optimized heat release rate is obtained; and inputting the optimized heat release rate into a one-dimensional simulation model, and quantitatively calculating the power strengthening potential of the air cooling machine. According to the quantitative estimation method for the power strengthening potential of the air cooling machine, the power strengthening potential of the air cooling machine is quantitatively estimated through the digital simulation technology, and the strengthening design efficiency is improved.

The invention discloses a thermal management system part type selection method, which belongs to the technical field of electric automobiles and comprises the following steps: dynamically calculating cooling and heating loads of a thermal management system; refrigerant side thermodynamic cycle parameters are matched; integrating and selecting key components of the thermal management system; constructing a multi-objective optimization function, and realizing parameter matching and capacity checking of a plurality of components; verifying the robustness and economy of a model selection scheme for multi-mode thermal management coupling under typical working conditions; according to the model selection method established based on dynamic coupling analysis, self-adaptive matching of a dynamic load model and refrigerant parameters is considered, and both precision and efficiency are considered; multi-loop coupling analysis is supported, the feasibility of redundant configuration and complex architecture can be quickly evaluated, multi-dimensional collaborative optimization is realized, and the trial and error cost is reduced; the method is suitable for forward design and iterative optimization of the new energy automobile thermal management system, the development cost can be remarkably reduced, and the system energy efficiency can be improved.

The present invention provides a heat engine operating on a novel closed thermodynamic cycle. The primary characteristics of the heat engine comprise a boiler, condenser, liquid pump, and a regenerative expander in which heat is recovered from the expansion / work extraction process to be returned to the sensible heat addition process that occurs between the condenser outlet and the boiler inlet. The regenerative expander may be comprised of a novel turbine design described as part of the present invention. The primary characteristic of the turbine being a rotor consisting of a hub intersected by a plurality of narrow helical channels through which motive fluid is directed by a plurality of nozzles to induce rotation in the same direction as the helical path of the channels. The liquid pump of the heat engine may also be comprised of a novel design based on similar working principles to the above turbine.

A cold energy recovery facility includes a liquid hydrogen tank configured to store liquid hydrogen a first circuit configured to circulate a first working medium, a second circuit configured to circulate a second working medium having a freezing point higher than the first working medium, a first turboexpander provided in the first circuit, the first turboexpander being configured to be driven by the first working medium in a gas state, a second turboexpander provided in the second circuit, the second turboexpander being configured to be driven by the second working medium in a gas state, a first heat exchanger configured to vaporize the liquid hydrogen from the liquid hydrogen tank by heat exchange with the first working medium, a second heat exchanger configured to vaporize the first working medium in a liquid state by heat exchange with the second working medium, and a third heat exchanger configured to vaporize the second working medium in a liquid state by heat exchange with a heat medium, wherein the first circuit and the first turboexpander form a part of a first thermodynamic cycle that uses the liquid hydrogen as a low-temperature heat source in the first heat exchanger, and the second circuit and the second turboexpander form a part of a second thermodynamic cycle that uses the first working medium as a low-temperature heat source in the second heat exchanger.

The invention provides a multi-mode combined cooling and power generation system based on efficient waste heat utilization and an operation method of the multi-mode combined cooling and power generation system. The multi-mode combined cooling and power generation system comprises an organic Rankine cycle and absorption type refrigeration cycle integrated low-grade cold energy production mode and an organic Rankine cycle and vapor compression type refrigeration cycle integrated medium-grade cold energy production mode. A high-grade cold energy production mode integrating organic Rankine cycle, absorption type refrigeration cycle and vapor compression type refrigeration cycle is adopted, in order to achieve gradient utilization of waste heat, the system considers the waste heat utilization sequence of thermodynamic cycle at the same time, and the waste heat is firstly utilized by the absorption type refrigeration cycle and then recovered by the organic Rankine cycle; waste heat is recycled through the organic Rankine cycle and then is utilized by the absorption type refrigeration cycle, and the waste heat is simultaneously recycled by the absorption type refrigeration cycle and the organic Rankine cycle after being shunted. Efficient cogeneration of cold electricity is achieved through gradient utilization of waste heat and heat-work coupling between circulation, multiple possibilities of a waste heat utilization path are considered, and the waste heat recovery rate is increased.

The invention discloses a rapid peak and frequency regulation system and method for a coal-fired unit with a regenerative system coupled with high-temperature working medium for heat storage, and relates to the technical field of conventional heating power and electricity technologies and energy storage, and the rapid peak and frequency regulation system comprises a coal-fired unit thermodynamic cycle system and a high-temperature working medium heat storage system, the high-temperature working medium heat storage system is deeply coupled with a thermodynamic cycle heat regeneration system of the coal-fired unit, and rapid combined peak regulation and frequency modulation of the unit are achieved by reducing the steam extraction amount of each stage of a steam turbine and cooperating with energy supply of the high-temperature working medium heat storage system. Firstly, when the unit needs to rapidly increase the load, rapid increase of the power generation output of the unit is achieved by reducing the steam extraction amount of each stage of a steam turbine, and meanwhile, high-temperature and high-pressure saturated water stored in a high-temperature working medium heat storage tank generates a certain amount of saturated steam through pressure reduction to replace steam extraction of each stage of the steam turbine to heat boiler feed water in a regenerative system; therefore, the water supply temperature of the boiler is kept unchanged or increased, and the variable load response capability of the coal-fired unit is quickly improved.

The invention provides a thermodynamic cycle system applied to a steam turbine. The thermodynamic cycle system comprises a boiler, the steam turbine and a vortex tube. The boiler generates steam with first temperature; the steam turbine discharges a first path of steam with second temperature to the vortex tube, a second path of steam with second temperature is discharged to the liquid inlet of the boiler, the vortex tube separates the first path of steam into hot steam with third temperature and cold steam with fourth temperature, and the hot steam with third temperature is recycled to the steam turbine; the steam turbine drives mechanical equipment through hot steam with the third temperature, cold steam with the fourth temperature is discharged to the liquid inlet of the boiler, the third temperature is higher than the second temperature, and the fourth temperature is lower than the second temperature; wherein the cold steam with the fourth temperature cools the second path of steam to generate cooling liquid, the cooling liquid enters the boiler from a liquid inlet of the boiler, the steam with the first temperature is generated after heating, a vacuum water ring pump and a condenser are omitted, and energy is saved.

The utility model relates to the technical field of hydraulic systems, in particular to a regenerative cooling and heat pump preheating integrated device of a hydraulic system. Comprising a hydraulic oil tank, a thermodynamic cycle subsystem and an air supply subsystem. The thermodynamic cycle subsystem comprises a plate heat exchanger, an expansion and compression all-in-one machine, an electric power generation all-in-one machine, a tube fin type heat exchanger and a spiral tube heat exchanger; the air supply subsystem comprises a fan thermodynamic circulation subsystem which is a working medium circulation loop and is switched between a heat pump preheating mode and a regenerative cooling mode, and preheating and cooling of hydraulic oil are achieved. According to the system, the overall energy utilization rate of the system is comprehensively improved, switching between a regenerative cooling mode and a heat pump preheating mode is achieved by monitoring the oil temperature, and the cooling effect and the energy efficiency of regenerative cooling are improved.

The application relates to the technical field of pipeline fixing, and particularly discloses a boiler steam turbine thermal cycle pipeline fixing device and a working method, which comprises a support rod fixedly installed on a wall top, an auxiliary assembly for adjusting the installation angle of a pipeline is arranged on the outer wall of the support rod, an installation ring is arranged at one end of the auxiliary assembly, a fixing ring is slidably connected to one end of the installation ring, and a fixing assembly for quickly fastening the pipeline is arranged in the fixing ring; the fixing assembly is arranged, the cycle pipeline can be quickly fixed, and the auxiliary assembly is arranged, so that the installation angle of the cycle pipeline can be adjusted.

The invention discloses an anti-scaling efficient evaporative water cooling system, which belongs to the technical field of refrigeration and heat pumps, comprises a compressor, a first heat exchanger, a second heat exchanger, a throttling component and a third heat exchanger which are connected through a four-way reversing valve, and is characterized in that the first heat exchanger and the second heat exchanger are connected in series on a refrigerant loop; and in the refrigeration mode, the refrigerant is pre-cooled by the first heat exchanger and then enters the second heat exchanger. According to the invention, the inlet temperature of the evaporative condenser is reduced from the source, and the generation of scale is effectively inhibited; and meanwhile, through thermodynamic circulation of staged cooling and two-stage evaporation, the energy efficiency and low-temperature adaptability of the system in a refrigerating and heating mode are remarkably improved, and the reliability of the system is enhanced.

Reactive working fluid for cyclic thermodynamic conversion machines, said working fluid, forming a monomer / dimer couple, said working fluid comprising a compound capable of reversibly associating / dissociating, during each thermodynamic cycle, by formation / breakage of Van der Waals bonds.

The present invention relates to the technical field of industrial exhaust VOCs recovery, and specifically to an organic carbon pump system for VOCs recovery, a circulation construction method and an evaluation method thereof. Industrial exhaust VOCs recovery is achieved by a single-stage organic carbon pump or a multi-stage organic carbon pump; the single-stage organic carbon pump includes an adsorption unit, a heating unit and a condensation unit; the multi-stage organic carbon pump is composed of multiple single-stage organic carbon pumps in series; by thermodynamic means, P ‑ q The VOCs adsorption-condensation recovery thermodynamic cycle is constructed in the Figure 1 and the Claperon diagram, and the energy efficiency of the organic carbon pump system is evaluated based on the first and second laws of thermodynamics. This application can flexibly select the appropriate organic carbon pump stage according to the concentration and boiling point of VOCs, improve the adaptability of VOCs recovery, and achieve more precise adsorption and desorption treatment of industrial exhaust VOCs. It can more effectively concentrate and recover low-concentration VOCs step by step, thereby improving the recovery effect.

The utility model discloses a hot spring geothermal turbine sustainable power generation system, which comprises a thermodynamic cycle system and a power generation system, the thermodynamic cycle system comprises a condenser and a flash evaporator, the condenser is communicated with the flash evaporator, the flash evaporator is communicated with the power generation system, and the power generation system is communicated with the power generation system. One end of the flash evaporator is used for being communicated with a hot spring geothermal well, and one end of the condenser is used for being connected with a heat dissipation assembly. And the power generation system is connected between the condenser and the flash evaporator and is communicated with the condenser and the flash evaporator to form a thermodynamic circulation loop. According to the technical scheme provided by the utility model, a sealed thermodynamic cycle loop is formed, no pollution emission is generated in the power generation process, the natural environment is not influenced, the performance is reliable, the efficiency is high, the maintenance is basically not needed, the service life is long, and the problems of low efficiency, low cost and the like of the existing organic Rankine cycle power generation technology are solved. And energy sources such as terrestrial heat and hot spring cannot be utilized more efficiently, and the heat exchange efficiency of the whole power generation system is improved.

The invention discloses a turboshaft engine thermodynamic cycle parameter evaluation method based on cost and task requirements, and the method achieves the evaluation of the thermodynamic cycle parameters of a turboshaft engine on the premise of comprehensively considering the coupling influence of cycle parameters, all parts and air system parameters. According to the method, the relation between the thermodynamic cycle parameters and all parts and the whole machine cost is established, and the distribution condition of the engine cost and the engine and fuel oil weight coefficient about the cycle parameters is obtained by combining the balance between the aircraft task and the weight, so that a reliable and scientific basis is provided for thermodynamic cycle parameter evaluation and further optimization; the method can be used for evaluating the applicability of different thermodynamic cycle parameter combinations to the flight platform, so that the cost of an engine is more advantageous, the minimum residual weight coefficient of the flight platform is still within an acceptable range, and the voyage of the flight platform is further improved.

The invention discloses an energy conversion method and device based on a gravity field gas vertical pressure gradient, and relates to the technical field of gravity field gas thermodynamic cycle and energy conversion. Comprising the steps that a closed circulation channel composed of a gas conveying power unit, a gas conveying expansion unit, an acting output unit and a gas backflow unit is filled with working gas; the working gas at the low position is driven to rise in the vertical direction, adiabatic expansion and acceleration are carried out under the pressure decreasing condition, and gas internal energy and pressure energy are converted into kinetic energy; the high-speed gas is guided into the acting output unit to drive the generator set to generate electricity; and the acting gas naturally settles and is compressed in the backflow channel by virtue of gravity, exchanges heat with the environment in the settling process to recover the initial state, and then enters the power conveying unit again. According to the invention, a closed circulating acting path utilizing the vertical pressure gradient of the gravity field is constructed, and the comprehensive utilization efficiency of low-grade heat energy and gas pressure energy is improved.

The invention belongs to the field of ramjet engines, and particularly relates to a combustion oscillation restraining structure and method and a ramjet engine, and the combustion oscillation restraining structure comprises a combustion oscillation forward sensing assembly, a pressure potential energy flow guiding device and a controller; the combustion oscillation forward sensing assembly comprises two pressure sensors arranged between an inlet of the combustion chamber and the injector; the pressure potential energy flow guide device comprises a flow guide pipe and a valve arranged in the flow guide pipe, an inlet of the flow guide pipe communicates with the inner wall of the combustion chamber and is located between the two pressure sensors, and an outlet of the flow guide pipe communicates with the spray pipe; the controller is used for controlling the opening and closing or the opening degree of the valve according to the combustion oscillation condition obtained by the combustion oscillation forward sensing assembly. According to the combustion oscillation suppression structure, combustion oscillation suppression is conducted on the basis of the internal mechanism of combustion oscillation of the ramjet, the pressure potential energy flow guiding device fully utilizes the pressure difference existing in the reaction flow field to adjust the flow field in a self-adaptive mode, and the thermodynamic cycle efficiency cannot be reduced.

The present invention discloses a carbon dioxide capture system comprising an absorption tower, a desorption tower, and a Rankine cycle system. The desorption tower is equipped with a precipitated gas discharge pipeline, and rich and lean liquid delivery pipelines are provided between the absorption tower and the desorption tower. The Rankine cycle system comprises a turbine generator set, a condenser, a working fluid delivery pump, a heat recovery heat exchanger, and an evaporator. The turbine generator set, condenser, working fluid delivery pump, heat recovery heat exchanger, and evaporator are connected by the working fluid delivery pipeline to form a thermodynamic cycle. The condenser is located in the rich liquid delivery pipeline, the heat recovery heat exchanger is located in the precipitated gas discharge pipeline, and the evaporator is located in the lean liquid delivery pipeline. This scheme uses the working fluid of the Rankine cycle system as the heat medium, transferring heat that cannot be used for power generation to the rich liquid to be heated, thereby recovering most of the low-grade waste heat and achieving cascade energy utilization. By utilizing the Rankine cycle to utilize the residual and waste heat after desorption, low-grade heat is converted into high-grade electricity.

The invention discloses a quick and flexible peak and frequency regulation system and method for a coal-fired unit based on high-temperature working medium energy storage / supply, and relates to the technical field of conventional power generation and energy storage, and the quick and flexible peak and frequency regulation system comprises a coal-fired unit thermodynamic cycle system and a high-temperature furnace water energy storage / supply system, the high-temperature furnace water storage and supply / energy system is deeply coupled with the coal-fired unit thermodynamic cycle system, and the power capability and the power generation load of the coal-fired unit are quickly improved by reducing the steam extraction amount of each stage of a steam turbine in the coal-fired unit thermodynamic cycle system, so that the climbing rate of the coal-fired unit is improved; and meanwhile, through direct cooperative energy supply of the high-temperature boiler water storage / energy supply system, the high-enthalpy-value working medium stored by the high-temperature boiler water storage / energy supply system heats boiler feed water in the regenerative system, the temperature of the boiler feed water is increased, then the boiler steam yield is increased, and the rapid variable load response capacity of the coal-fired unit is improved.

The invention relates to a coaxial heat exchanger (1) for reversible operation with an inner tube (2) on the outside (21) of which ribs (25) with a rib height (H1) are formed, and with an outer tube (3) arranged coaxially to the inner tube (2) on the inside (32) of which projections (35) are formed which extend substantially radially from the tube wall (30) of the outer tube (3) and continuously along the inside (32) of the outer tube (3). The projections (35) of the outer tube (3) form an angle of at least 60° with the ribs (25) on the outside (21) of the inner tube (2) and are connected to them, thereby forming several parallel, flowable channels (4) between the tube wall (30) of the outer tube (3) and the tips (26) of the ribs (25) of the inner tube (2), each having a cross-sectional area (A2) measured transversely to the flow direction and a channel height (H2).Adjacent channels (4) are each separated from one another by a projection (35) of the outer tube (3). The ratio of the cross-sectional area (A1) of the inner tube (2) to the sum of the cross-sectional areas (A2) of all channels (4) is at least 0.5 and at most 5. The invention further relates to a thermodynamic cycle with such a coaxial heat exchanger and a method for operating such a cycle.

The present application relates to the technical field of advanced thermodynamic cycle, in particular to a very low temperature heat energy recycling system and method based on advanced thermodynamic cycle. It comprises: a heat source guide and heat absorption unit for pretreating low temperature heat source and transmitting heat data to mixed working medium through a heat exchange module; a heat energy conversion and working medium compression unit for receiving heat data to convert heat data and compress working medium; a heat recovery and heat release unit for reducing the temperature of working medium through constant pressure heat exchange and transferring heat data to a Rankine cycle to do work; and a working medium expansion and compression energy recycling and refrigeration unit for adiabatic expansion of high pressure and low temperature working medium to further reduce the temperature and pressure of working medium and provide cooling energy to the system. The present application can maximize the recycling and utilization of waste low temperature heat energy by using advanced thermodynamic cycle, especially high efficiency energy conversion mechanism in very low temperature range.

The utility model discloses a coal-fired unit rapid and flexible peak and frequency regulation system based on high-temperature working medium energy storage / supply, which relates to the field of conventional power generation technology and energy storage technology and comprises a coal-fired unit thermodynamic cycle system and a high-temperature furnace water energy storage / supply system, the high-temperature furnace water storage and supply / energy system is deeply coupled with the coal-fired unit thermodynamic cycle system, and the power capability and the power generation load of the coal-fired unit are quickly improved by reducing the steam extraction amount of each stage of a steam turbine in the coal-fired unit thermodynamic cycle system, so that the climbing rate of the coal-fired unit is improved; and meanwhile, through direct cooperative energy supply of the high-temperature boiler water storage / energy supply system, the high-enthalpy-value working medium stored by the high-temperature boiler water storage / energy supply system heats boiler feed water in the regenerative system, the temperature of the boiler feed water is increased, then the boiler steam yield is increased, and the rapid variable load response capacity of the coal-fired unit is improved.