CN-122015341-A - Heat pump waste heat recovery system based on transcritical circulation

CN122015341ACN 122015341 ACN122015341 ACN 122015341ACN-122015341-A

Abstract

The invention relates to the technical field of heat pump systems, and discloses a heat pump waste heat recovery system based on transcritical cycle, which comprises a compression module, a heat exchange scheduling module, a phase separation module, a flow control module, a heat absorption module and a flow path topology control module, wherein the flow path topology control module stores the current communication characteristic set of the heat exchange scheduling module, previews candidate communication states according to the exhaust pressure and the exhaust temperature parameters of the compression module to generate a target communication characteristic set, calculating the configuration transition deviation of a target communication feature set relative to the current communication feature set, determining a physical switching constraint weight, introducing thermodynamic efficiency evaluation logic, and outputting a switching instruction to adjust a controlled valve group to realize state transition when an evaluation result meets a transition criterion.

Inventors

YUAN HAO
WANG BIN

Assignees

洛南县中田永恒供热有限公司

Dates

Publication Date: 20260512
Application Date: 20260414

Claims (10)

1. The heat pump waste heat recovery system based on transcritical cycle is characterized by comprising a compression module, a heat exchange scheduling module, a phase separation module, a flow control module, a heat absorption module and a flow path topology control module: the compression module, the heat exchange scheduling module, the flow control module and the heat absorption module are communicated to form a transcritical circulation loop; The flow path topology control module is connected with the heat exchange scheduling module and is used for storing the current communication characteristic set of the heat exchange scheduling module in the current fluid communication state; The flow path topology control module acquires the exhaust pressure parameter and the exhaust temperature parameter of the compression module, generates a target communication feature set by predicting the candidate communication state of the heat exchange scheduling module, and calculates the configuration transition deviation amount of the target communication feature set relative to the current communication feature set; The flow path topology control module determines physical switching constraint weights according to the configuration transition deviation amount, and introduces the physical switching constraint weights into thermodynamic efficiency evaluation logic to complete state transition evaluation; when the output result of the thermodynamic efficiency evaluation logic meets the migration criterion, the flow path topology control module outputs a switching instruction to the heat exchange scheduling module, and the opening and closing states of the controlled valve groups in the heat exchange scheduling module are regulated so that the heat exchange scheduling module is migrated from the current fluid communication state to the candidate communication state.
2. The transcritical cycle-based heat pump waste heat recovery system according to claim 1 is characterized in that a heat exchange scheduling module internally comprises a plurality of gas cooling units which are arranged in parallel or in series and a controlled electromagnetic valve group on a communicating pipeline, a flow path topology control module takes the gas cooling units as topology nodes, takes a pipeline path controlled by the controlled electromagnetic valve group as a branch edge to construct a topology configuration reflecting the flow direction of fluid, and the values in a current communicating feature set and a target communicating feature set respectively represent the flow direction and the on-off state of the fluid between the gas cooling units.
3. The transcritical cycle based heat pump waste heat recovery system of claim 1, wherein the flow path topology control module obtains an exhaust pressure parameter and an exhaust temperature parameter comprising an exhaust pressure value of the compression module, a fluid temperature value of an outlet of the heat exchange scheduling module, an inlet temperature value of a heat sink side fluid, an outlet temperature value, and a mass flow rate value, and the thermodynamic efficiency evaluation logic takes an overall fire efficiency increment of the system as an input parameter.
4. The transcritical cycle based heat pump waste heat recovery system of claim 1, wherein the flow topology control module calculates the integrated estimate delta value by: Wherein DeltaPhi is the comprehensive evaluation increment value, deltaeta is the thermodynamic efficiency improvement quantity of the system of the candidate communication state relative to the current fluid communication state, lambda is the preset stability balance coefficient, the value range is 0.15 to 0.45, And when the comprehensive evaluation increment value is greater than 0, judging that the migration criterion is met.
5. The transcritical cycle-based heat pump waste heat recovery system according to claim 1, further comprising a gas-supplementing enthalpy-increasing module arranged between the phase separation module and the gas-supplementing port of the compression module, wherein the gas-supplementing enthalpy-increasing module is controlled by the flow path topology control module and adjusts the gas phase flow entering the compression module according to the topology dimension corresponding to the current fluid communication state of the heat exchange scheduling module.
6. The transcritical cycle based heat pump waste heat recovery system of claim 1, wherein the heat exchange scheduling module is driven by a switching command to adjust between downstream, upstream and mixed flow topologies to match a medium heat release profile inside the heat exchange scheduling module with a temperature gradient field on a heat source side.
7. The transcritical cycle based heat pump waste heat recovery system of claim 1, wherein the flow path topology control module, when calculating the configuration transition deviation amount, resets the weight for changing the communication order of the topology nodes to a first value and the weight for changing the on-off state of the fluid to a second value, the first value being higher than the second value.
8. The transcritical cycle based heat pump waste heat recovery system of claim 1, further comprising a pressure prediction module for monitoring an exhaust pressure fluctuation rate of the compression module, wherein the flow path topology control module locks the current set of connected characteristics when the exhaust pressure fluctuation rate exceeds 1.5 bar/s.
9. The transcritical cycle based heat pump waste heat recovery system of claim 1, wherein each gas cooling unit inside the heat exchange scheduling module is arranged in a step shape for heating process water meeting different temperature requirements of a heat sink side, and the non-linear distribution of heat is realized through reconstruction of a target communication characteristic collector to a fluid path.
10. The transcritical cycle based heat pump waste heat recovery system of claim 1, wherein the flow path topology control module is integrated within the industrial control assembly for performing calculation of the physical switching constraint weights to cope with random fluctuations in the exhaust pressure parameter and the exhaust temperature parameter by adjusting the open and closed states of the controlled solenoid valve block.

Description

Heat pump waste heat recovery system based on transcritical circulation Technical Field The invention belongs to the technical field of heat pump systems, and particularly relates to a transcritical cycle-based heat pump waste heat recovery system. Background At present, in industrial high-temperature waste heat recovery, carbon dioxide is adopted as a working medium in transcritical circulation, and the temperature drop characteristic of no phase change of the working medium in a gas cooler is utilized to match heat sink with temperature gradient requirements, so that energy recovery is realized. Because the specific heat capacity of the transcritical fluid near the critical area has severe nonlinear characteristics, when external heat source parameters fluctuate, the heat capacity rates of the working medium side and the heat sink side in the gas cooler are mismatched, so that the heat transfer temperature difference distribution is distorted, a means for simply increasing the heat exchange area or adjusting the frequency of a compressor cannot adjust the mass flow distribution from the level of the internal flow structure of a circulation loop, and the irreversible heat transfer loss generated by physical mutation is difficult to eliminate, for example, the Chinese patent application with the publication number of CN121562106A discloses a heat exchange network transformation method and device, an NSGA-II algorithm is utilized to solve the transformation scheme with the minimum total annual cost as a target, because of anchoring typical working condition steady state optimization, the side heavy structure dimension redundancy configuration or parameter correction is not penetrated to the transient dynamic level caused by the severe physical mutation of the transcritical working medium in the critical area, when the heat source fluctuates randomly, the physical cost quantization constraint of the flow path configuration migration is lacked, the control command is easy to be induced to discrete and jump between different topological states, so that the system operation steady state is difficult to be eliminated, and in a network structure formed by a plurality of heat exchange sub-modules, the dynamic switching of the flow path topology is used for compensating the heat exchange dynamic flow configuration, but the dynamic flow path topology is easy to change, the dynamic flow path configuration is easy to cause the dynamic change, the dynamic flow path has a dynamic state, the dynamic flow configuration is easy to cause the dynamic state, the dynamic flow configuration to change, the dynamic flow physical state has a dynamic state, and the dynamic flow physical state to cause the dynamic state to be stable state, and the dynamic state physical state. Therefore, how to construct a transcritical circulation architecture based on topological structure evolution constraint, to realize the self-adaptive matching of the working medium heat release track and the fluctuation heat source, and to ensure the stability of the physical switching process, becomes the technical problem to be solved by the invention. Disclosure of Invention The invention provides a heat pump waste heat recovery system based on transcritical cycle, which comprises a compression module, a heat exchange scheduling module, a phase separation module, a flow control module, a heat absorption module and a flow path topology control module, wherein the compression module is used for compressing heat of a heat pump, and the heat exchange scheduling module is used for compressing heat of the heat pump: the compression module, the heat exchange scheduling module, the flow control module and the heat absorption module are communicated to form a transcritical circulation loop; The flow path topology control module is connected with the heat exchange scheduling module and is used for storing the current communication characteristic set of the heat exchange scheduling module in the current fluid communication state; The flow path topology control module acquires the exhaust pressure parameter and the exhaust temperature parameter of the compression module, generates a target communication feature set by predicting the candidate communication state of the heat exchange scheduling module, and calculates the configuration transition deviation amount of the target communication feature set relative to the current communication feature set; The flow path topology control module determines physical switching constraint weights according to the configuration transition deviation amount, and introduces the physical switching constraint weights into thermodynamic efficiency evaluation logic to complete state transition evaluation; when the output result of the thermodynamic efficiency evaluation logic meets the migration criterion, the flow path topology control module outputs a switching instruction to the heat exchange scheduling module, and the opening and clo