Method and device for optimizing operation parameters of steam compression type waste heat recovery heat pump system

Abstract

The invention relates to the technical field of waste heat recovery, in particular to a method and device for optimizing operation parameters of a steam compression type waste heat recovery heat pump system. The optimization method comprises the following steps: acquiring a required temperature value of a heat using end and an initial temperature value of a heat taking end; under the condition that the heat storage medium of the heat removal end is known, the optimal end temperature value of the heat removal end is determined; when the heat storage medium at the heat taking end releases heat and is cooled to the optimal final temperature value, the heat pump system conforms to the optimal design rule; and the optimal operation parameters of the heat pump system are calculated based on the required temperature value of the heat using end and the initial temperature value and the optimal end temperature value of the heat taking end, wherein the operation parameters comprise the energy-saving benefit, the power consumption, the heating energy efficiency and the heat supply amount of the heat pump system. According to the method and device provided by the invention, the uncertainty of optimal design working condition selection of the steam compression type waste heat recovery heat pump system is eliminated, the design efficiency of the heat pump system is improved, and the heat pump system has the optimal energy-saving effect.

Description

Technical Field

[0001] This application relates to the technical field of waste heat recovery, and specifically relates to an optimization method for operating parameters of a steam compression waste heat recovery heat pump system and an optimization device for operating parameters of a steam compression waste heat recovery heat pump system. Background Art

[0002] Heat pump technology belongs to the fields of energy utilization and energy conservation, and is a technology for improving the energy grade by using external low-grade heat sources. It has a wide range of applications, including refrigeration, heating, hot water, steam supply, etc. according to the increasing temperature levels of the heat sources used, and is applied in many fields such as industry and civil use.

[0003] Currently, the commonly used heat pump products mainly include air source heat pumps, ground source heat pumps, water source heat pumps, absorption heat pumps, steam compression heat pumps, etc.

[0004] Among them, the steam compression heat pump is a heat pump application with relatively large heat absorption and heat release. Usually, the heat demand of a single device is dozens to hundreds of times that of a civil heat pump. However, at present, the industry of steam compression waste heat recovery heat pump systems still relies on experience in the selection method of designing the best system operating parameters, lacking a clear theoretical basis, with certain uncertainties. Or several different heat extraction conditions are taken for multiple process simulation simulations to compare and determine the best system operating parameters. The rationality of the results depends on the number of simulation simulations, and the efficiency is relatively low. Summary of the Invention

[0005] The purpose of the embodiments of this application is to provide an optimization method for operating parameters of a steam compression waste heat recovery heat pump system, an optimization device for operating parameters of a steam compression waste heat recovery heat pump system, an electronic device, and a machine-readable storage medium.

[0006] To achieve the above purpose, in the first aspect of this application, an optimization method for operating parameters of a steam compression waste heat recovery heat pump system is provided. The heat pump system is used to convert low-grade heat energy absorbed from a heat extraction end into high-grade heat energy that can be used by a heat utilization end and release it at the heat utilization end. Among them, the heat pump system uses a working medium to achieve the heat absorption and heat release processes. The optimization method includes: obtaining the required temperature value of the heat utilization end and the initial temperature value of the heat extraction end; determining the best final temperature value of the heat extraction end under the condition of knowing the heat storage medium of the heat extraction end; when the heat storage medium of the heat extraction end releases heat and cools down to the best final temperature value, the heat pump system conforms to the best design rule; calculating the best operating parameters of the heat pump system based on the required temperature value of the heat utilization end, the initial temperature value, and the best final temperature value of the heat extraction end. The operating parameters include: the energy-saving benefit, power consumption, heating energy efficiency, and heat supply of the heat pump system.

[0007] Based on the first aspect, in some embodiments of the present application, the heat pump system conforming to the optimal design rule means that the heat pump system achieves the maximum energy-saving benefit on the premise that the heating energy efficiency meets the preset requirements.

[0008] Based on the first aspect, in some embodiments of the present application, the calculation formula for the heating energy efficiency COP of the heat pump system is as follows: COP = A × η (1). In formula (1), A < 1 represents a system constant obtained by establishing a simulation model or experiment, and η represents the theoretical heating energy efficiency of the heat pump system, and its calculation formula is: In formula (1-1), t 2 represents the required temperature value at the heat-using end, and t 1 represents the final temperature value at the heat-extracting end.

[0009] Based on the first aspect, in some embodiments of the present application, the power consumption W of the heat pump system can be calculated according to the following calculation formula: In formula (2), ΔH 1 represents the enthalpy change of the heat storage medium at the heat-extracting end, which is a known quantity.

[0010] Based on the first aspect, in some embodiments of the present application, the heat supply ΔQ of the heat pump system 2 has the following calculation formula: ΔQ 2 = ΔQ 1 + W = ΔH 1 + W (3). In formula (3), ΔQ 1 represents the heat absorbed by the heat pump system from the heat-extracting end.

[0011] Based on the first aspect, in some embodiments of the present application, the energy-saving benefit E of the heat pump system has the following calculation formula: E = ΔQ 2 a - Wb (4). In formula (4), a represents the steam price per unit heat release (kW / h), and b represents the electricity price.

[0012] In the second aspect, the present application provides an optimization device for the operating parameters of a vapor compression waste heat recovery heat pump system. The heat pump system is used to convert low-grade heat energy absorbed from the heat-extracting end into high-grade heat energy that can be used at the heat-using end and release it at the heat-using end. Among them, the heat pump system uses a working medium to achieve the heat absorption and heat release processes. The optimization device includes: an acquisition module for acquiring the required temperature value at the heat-using end and the initial temperature value at the heat-extracting end; a determination module for determining the optimal final temperature value at the heat-extracting end under the condition of knowing the heat storage medium at the heat-extracting end; when the heat storage medium at the heat-extracting end releases heat and cools down to the optimal final temperature value, the heat pump system conforms to the optimal design rule; a calculation module for calculating the optimal operating parameters of the heat pump system based on the required temperature value at the heat-using end, the initial temperature value and the optimal final temperature value at the heat-extracting end. The operating parameters include: the energy-saving benefit, power consumption, heating energy efficiency and heat supply of the heat pump system.

[0013] Based on the second aspect, in some embodiments of the present application, the calculation module further includes: a first calculation unit, configured to calculate the heating coefficient of performance COP of the heat pump system through the following calculation formula: COP = A×η (1), in formula (1), A < 1, representing a system constant, and η representing the theoretical heating coefficient of performance of the heat pump system, and its calculation formula is: In formula (1-1), t 2 represents the required temperature value at the heat-using end, and t 1 represents the terminal temperature value at the heat-extracting end; a second calculation unit, configured to calculate the power consumption W of the heat pump system according to the following calculation formula: In formula (2), ΔH 1 represents the enthalpy change of the heat storage medium at the heat-extracting end, which is a known quantity; a third calculation unit, configured to calculate the heat supply ΔQ of the heat pump system according to the following calculation formula 2 : ΔQ 2 = ΔQ 1 + W = ΔH 1 + W (3), in formula (3), ΔQ 1 represents the heat absorbed by the heat pump system from the heat-extracting end; a fourth calculation unit, configured to calculate the energy-saving benefit E of the heat pump system according to the following calculation formula: E = ΔQ 2 a - Wb (4), in formula (4), a represents the steam price per unit heat release (kW / h), and b represents the electricity price.

[0014] In a third aspect, the present application provides an electronic device, including a memory, a processor, and a computer program stored in the memory and executable on the processor. When the processor executes the computer program, the above-mentioned optimization method for the operating parameters of the steam compression waste heat recovery heat pump system is implemented.

[0015] In a fourth aspect, the present application provides a machine-readable storage medium, on which instructions are stored. When the instructions are executed by a processor, the processor is configured to execute the above-mentioned optimization method for the operating parameters of the steam compression waste heat recovery heat pump system.

[0016] In the present application, by studying the principles of the heat engine Carnot cycle and the heat pump reverse Carnot cycle, the relationship between the energy-saving economic benefits of the steam compression waste heat recovery heat pump device and the heat-extracting working conditions is obtained. Furthermore, a general calculation method for calculating the operating parameters of the steam compression heat pump system in the waste heat recovery scenario is explored. The calculation results are reliable, which can provide a theoretical basis for the steam compression waste heat recovery heat pump system, eliminate the uncertainty in the selection of the optimal design working conditions of the steam compression waste heat recovery heat pump system, the calculation process is convenient, and the design process of the waste heat recovery heat pump device can be further optimized, improving the efficiency and the energy-saving effect of the system.

[0017] Other features and advantages of the embodiments of the present application will be described in detail in the subsequent specific implementation section. Description of the Drawings

[0018] The drawings are used to provide a further understanding of the embodiments of the present application, and constitute a part of the specification. Together with the following specific implementation, they are used to explain the embodiments of the present application, but do not constitute a limitation to the embodiments of the present application. In the drawings:

[0019] Figure 1 Schematically shows the schematic diagram of the principle of the vapor compression waste heat recovery heat pump system;

[0020] Figure 2 Schematically shows the application system structure diagram of the vapor compression waste heat recovery heat pump system;

[0021] Figure 3 Schematically shows the relationship curve of the gas phase fraction D - t of the heat source under the first working condition 1 Relationship curve graph;

[0022] Figure 4 Schematically shows the relationship curve of the theoretical efficiency η - t under the first working condition 1 Relationship curve graph;

[0023] Figure 5 Schematically shows the relationship curve of the actual heating energy efficiency COP - t under the first working condition 1 Relationship curve graph;

[0024] Figure 6 Schematically shows the relationship curve of the enthalpy change ΔH of the heat source - t under the first working condition 1 -t 1 Relationship curve graph;

[0025] Figure 7 Schematically shows the relationship curve of the heat extraction amount ΔQ - t under the first working condition 1 -t 1 Relationship curve graph;

[0026] Figure 8 Schematically shows the relationship curve of the power consumption W - t under the first working condition 1 Relationship curve graph;

[0027] Figure 9 Schematically shows the relationship curve of the heat supply amount ΔQ - t under the first working condition 2 -t 1 Relationship curve graph;

[0028] Figure 10 Schematically shows the relationship curve of the annual energy - saving economic benefit E - t under the first working condition 1 Relationship curve graph;

[0029] Figure 11 Schematically shows the relationship curve of the gas phase fraction D - t of the heat source under the second working condition1 Relationship curve graph

[0030] Figure 12 Schematically shows the theoretical efficiency η-t under the second working condition 1 Relationship curve graph

[0031] Figure 13 Schematically shows the actual heating energy efficiency COP-t under the second working condition 1 Relationship curve graph

[0032] Figure 14 Schematically shows the heat source enthalpy change ΔH under the second working condition 1 -t 1 Relationship curve graph

[0033] Figure 15 Schematically shows the heat extraction amount ΔQ under the second working condition 1 -t 1 Relationship curve graph

[0034] Figure 16 Schematically shows the power consumption W-t under the second working condition 1 Relationship curve graph

[0035] Figure 17 Schematically shows the heat supply amount ΔQ under the second working condition 2 -t 1 Relationship curve graph

[0036] Figure 18 Schematically shows the annual energy-saving economic benefit E-t under the second working condition 1 Relationship curve graph Specific implementation manners

[0037] To make the objectives, technical solutions and advantages of the embodiments of the present application clearer, the technical solutions in the embodiments of the present application will be clearly and completely described below in conjunction with the accompanying drawings in the embodiments of the present application. It should be understood that the specific implementation manners described herein are only used to illustrate and explain the embodiments of the present application, and are not used to limit the embodiments of the present application. All other embodiments obtained by those of ordinary skill in the art based on the embodiments in the present application without creative efforts fall within the scope of protection of the present application.

[0038] It should be noted that if there are directional indications (such as up, down, left, right, front, back, etc.) involved in the embodiments of the present application, then the directional indications are only used to explain the relative positional relationship and movement conditions between components in a specific posture (as shown in the drawings). If the specific posture changes, the directional indications will also change accordingly.

[0039] In addition, if there are descriptions involving "first", "second", etc. in the embodiments of the present application, the descriptions of "first", "second", etc. are only used for descriptive purposes and cannot be understood as indicating or suggesting their relative importance or implicitly indicating the number of technical features indicated. Therefore, the features defined as "first" and "second" may explicitly or implicitly include at least one of the features. In addition, the technical solutions between the various embodiments can be combined with each other, but they must be based on the ability of ordinary technicians in the field to implement them. When the combination of technical solutions is contradictory or cannot be implemented, it should be deemed that such combination of technical solutions does not exist and is not within the scope of protection required by this application.

[0040] Example 1

[0041] This embodiment provides a method for optimizing the operating parameters of a steam compression waste heat recovery heat pump system, wherein the heat pump system is used to convert low-grade heat energy absorbed from a heat extraction end into high-grade heat energy that can be used by a heat use end and release it at the heat use end, wherein the heat pump system uses a working fluid to realize a heat absorption and heat release process, and the optimization method includes:

[0042] S1, obtaining the required temperature value of the hot end and the initial temperature value of the hot end;

[0043] S2. Under the condition that the heat storage medium at the heat extraction end is known, the optimal final temperature value of the heat extraction end is determined; when the heat storage medium at the heat extraction end releases heat and cools down to the optimal final temperature value, the heat pump system meets the optimal design rules;

[0044] S3. Calculate the optimal operating parameters of the heat pump system based on the required temperature value of the hot end and the initial temperature value and the optimal final temperature value of the hot end. The operating parameters include: energy saving benefit, power consumption, heating energy efficiency and heating supply of the heat pump system.

[0045] In this application, the principle schematic diagram of the steam compression waste heat recovery heat pump system is as follows Figure 1 As shown in the figure, the basic principle of the steam compression heat pump system is to use the working fluid to absorb heat from the low-temperature heat source at the heat-taking end, release heat at the high-temperature heat-using end, and achieve energy improvement of the low-temperature heat source by circulating the working fluid. Generally speaking, in the application scenario of the steam compression heat pump system, the temperature requirement of the heat-using end is certain, and the heat intake of the steam compression heat pump system is related to the outlet temperature after the heat source at the heat-taking end releases heat (the final temperature value of the heat-taking end) t 1 It is related to the COP (heating efficiency) and ΔQ of the entire system. 2 Parameters such as W (heat supply) and W (power consumption) affect the energy-saving benefits of the entire system.

[0046] For example, the application system structure diagram of the steam compression waste heat recovery heat pump system can be referred to Figure 2, where the red line part is the flow cycle track of the working medium. The low-grade heat energy in the top steam is replaced into the working medium by the No. 1 heat exchanger, and then the working medium is heated and pressurized by the compressor to obtain high-grade heat energy. The No. 2 heat exchanger uses the working medium after heating and pressurization to heat the kettle liquid, and then obtains the kettle steam. Finally, the kettle steam is sent back to the reaction tower. After releasing heat, the working medium exits from the No. 2 heat exchanger and absorbs heat at the No. 1 heat exchanger, thus completing a cycle.

[0047] In this embodiment, by studying the principles of the heat engine Carnot cycle and the heat pump reverse Carnot cycle, the relationship between the energy-saving economic benefits of the steam compression waste heat recovery heat pump device and the heat extraction working conditions is obtained. Furthermore, a general calculation method for calculating the energy-saving benefit curve of the steam compression heat pump device in the waste heat recovery scenario is explored. The calculation results are reliable, which can provide a theoretical basis for the steam compression waste heat recovery heat pump device, eliminate the uncertainty in the selection of the optimal design working conditions of the steam compression waste heat recovery heat pump device, and the calculation process is convenient. It can further optimize the design process of the waste heat recovery heat pump device, improve the efficiency and the energy-saving effect of the system.

[0048] Specifically, in this embodiment, the system operation parameters required for designing the heat pump system include: the energy-saving benefit, power consumption, heating coefficient of performance, and heat supply of the heat pump system. Since the required temperature value at the heat utilization end, the initial temperature value at the heat extraction end, and the working medium are all known, it is only necessary to clarify the final temperature value at the heat extraction end, and the above system operation parameters can be solved. Specifically, the solution processes of each system operation parameter are as follows:

[0049] 1) For the heating coefficient of performance COP of the heat pump system, its calculation idea is as follows:

[0050] The steam compression heat pump system is a reverse Carnot cycle, and the theoretical heating coefficient of performance η is:

[0051]

[0052] where, t 2 represents the required temperature value at the heat utilization end, and t 1 represents the final temperature value at the heat extraction end.

[0053] The actual heating coefficient of performance COP is affected by factors such as the theoretical heating coefficient of performance η, the type of working medium, the mechanical efficiency, adiabatic efficiency, and sealing performance of the heat pump system. The actual COP is:

[0054] COP = A × η (1)

[0055] where, A is a coefficient related to factors such as the type of working medium, the mechanical efficiency, adiabatic efficiency, and sealing performance of the heat pump system, A < 1, and this parameter can be obtained through establishing a simulation model or experiments.

[0056] When the working fluid type is determined, assuming that the system mechanical efficiency, insulation efficiency, sealing performance and other factors are constant, A is a constant, and the actual heating energy efficiency COP is only related to η, and the required temperature value t of the hot end is used. 2 is determined, η and the final temperature value t of the hot end 1 So COP is only related to t 1 In this embodiment, based on a large number of tests and simulations on different heat extracting working fluids, it is creatively concluded that there is a constant A. When the firmware design indicators of the waste heat recovery system, such as the selection of the heat exchanger, the temperature difference between the cold and hot sides, the adiabatic efficiency and mechanical efficiency of the compressor, the pressure drop of each part, etc., remain unchanged, A is only related to the working fluid type. This conclusion is applicable after actual verification. Different working fluids under fixed design conditions have different A values ​​but are all in t 1 It remains basically unchanged during the change process. Thus, the theoretical calculation path from the theoretical reverse Carnot cycle efficiency η to the actual energy efficiency COP is opened up.

[0057] Therefore, if the heat storage medium at the heat extraction end is known, η-t can be plotted based on the above formula (1-1) and formula (1): 1 Relationship curve diagram (such as Figure 4 and Figure 12 ) and COP-t 1 Relationship curve diagram ( Figure 5 and Figure 13 ),in, Figure 4 and Figure 5 The corresponding Figure 3 The heat storage medium shown, Figure 12 and Figure 13 The corresponding Figure 11 The heat storage medium shown. Figure 3 and Figure 11 , respectively represent the remaining gas (steam) ratio Dt 1 Relationship curve diagram, such as Figure 3 The inflection point (131, 0.0) means that when the temperature of the heat-taking end (heat storage medium) drops to 131°C, the heat storage medium has been completely liquefied (all latent heat has been released at this time. If the temperature continues to drop, the heat released is sensible heat. In industrial applications, sensible heat usually only accounts for a small part of the total heat).

[0058] 2) For the power consumption W of the heat pump system, the calculation idea is as follows:

[0059] The definition of heating energy efficiency COP is:

[0060]

[0061] From the first law of thermodynamics:

[0062] ΔQ 2 =ΔQ 1+W (2-2)

[0063] It can be seen from (2-1) and (2-2) that:

[0064]

[0065] In the above equations, ΔQ 1 represents the heat absorbed by the heat pump system from the heat extraction end, and ΔQ 2 represents the heat supply of the heat pump system, and W represents the power consumption of the heat pump system.

[0066] From the definition of enthalpy:

[0067] ΔH = ΔU + ΔPV (2-4)

[0068] It can be known that at the heat extraction end and the heat utilization end:

[0069] |ΔH| = ΔQ (2-5)

[0070] From Equation 2-3 and Equation 2-5, we get:

[0071]

[0072] In the above equations, ΔH represents the enthalpy change, ΔU represents the change in the internal energy of the system, ΔPV represents the mechanical work done by the system on the outside or the mechanical work done on the system by the outside, ΔQ represents the heat absorbed or released by the working fluid, and ΔH 2 represents the enthalpy change of the heat storage medium at the heat utilization end (such as Figure 2 the bottom liquid in), and ΔH 1 represents the enthalpy change of the heat storage medium at the heat extraction end. Among them, the enthalpy change ΔH 1 of the heat storage medium at the heat extraction end can be obtained by using a physical property query tool or calculated according to the substance composition, temperature, and pressure parameters of the heat extraction fluid. Therefore, it is regarded as a known parameter here. Since the waste heat sources of the steam compression waste heat recovery heat pump system are mostly high-temperature gas-phase mixtures, in this embodiment, creatively, starting from the perspective of calculating the change in the enthalpy value of the heat source, the heat extraction amount at different temperatures can be accurately obtained.

[0073] On the premise of calculating the heating efficiency COP and the enthalpy change ΔH 1 of the heat storage medium at the heat extraction end, the value of the power consumption W can be obtained based on Equation (2-6). Furthermore, by methods such as value taking and plotting points, the ΔH 1 -t 1 relationship curve graph (as shown in Figure 6 and Figure 14 ), the ΔQ 1 -t 1 relationship curve graph (as shown in Figure 7 and Figure 15 ), and the ΔQ 2 -t 1 relationship curve graph (as shown inFigure 9 and Figure 17 as shown) and W-t 1 relationship curve (such as Figure 8 and Figure 16 as shown).

[0074] 3) For the heat supply ΔQ of the heat pump system 2 , the calculation idea is as follows:

[0075] From Equation 2-1 and Equation 2-5, we get:

[0076] ΔQ 2 = ΔQ 1 + W = ΔH 1 + W (3)

[0077] On the premise of calculating the power consumption W and the enthalpy change ΔH of the heat storage medium at the heat extraction end 1 , based on Equation (3), the heat supply ΔQ of the heat pump system can be obtained 2 .

[0078] 4) For the energy-saving benefit E of the heat pump system, the calculation idea is as follows:

[0079] E = value of heat provided by the system - value of system power consumption (4-1)

[0080] Specifically, given that the steam price is a and the electricity price is b, the calculation formula for the energy-saving benefit E of the heat pump system can be written as:

[0081] E = ΔQ 2 a - Wb (4)

[0082] In addition, when the energy-saving benefit E = 0, from Equation (2-1) and (4-1), we know that:

[0083] COP min × price of steam per kWh = electricity price (4-2)

[0084] From Equation (1-1), (1) and (4-2), the temperature after heat release at the heat source of the heat extraction end when the energy-saving benefit is 0 is t 1min .

[0085] Therefore, under the given conditions of the heat extraction end and the heat utilization end, using the physical property query tool to obtain the enthalpy change ΔH 1 , the temperature after heat release at the heat source of the heat extraction end of the vapor compression heat pump system can be obtained from t 1min to t 1 COP, heat supply, system power consumption, annual energy-saving benefit and investment return period data at each heat extraction temperature point. Make the obtained data into charts Figures 3 to 10 、 Figures 11 to 18It is a schematic diagram of the energy-saving benefit curve of the vapor compression waste heat recovery heat pump system under two application scenarios, from which the variation rules of each parameter can be intuitively seen to determine the optimal operating point of the device. In this application, the heat pump system conforming to the optimal design rule means that the energy-saving benefit reaches the maximum on the premise that the heating energy efficiency meets the preset requirements. Among them, the heating energy efficiency meeting the preset requirements means that the heating energy efficiency (COP) needs to meet the access requirements of the national standard GB29541-2013 and the Development and Reform Commission's No. 1719 document.

[0086] For example, the heat storage medium at the heat extraction end under the first working condition, (such as Figure 3 ) has an obvious inflection point (131, 0.0) during the heat release process, and the gas proportion can drop from 100% to zero within a short temperature change range. Correspondingly, (such as Figure 10 ) the energy-saving benefit E also reaches the maximum value at this temperature point, (such as Figure 8 ) and the energy-saving benefit COP also meets the access requirements of the national standard GB29541-2013 and the Development and Reform Commission's No. 1719 document. Therefore, under the first working condition, 131°C is the optimal final temperature value, and the system operation parameters corresponding to this temperature value are the optimal operation parameters under the first working condition.

[0087] For the heat storage medium at the heat extraction end under the second working condition, (such as Figure 11 ) there is no obvious inflection point during the heat release process, that is, latent heat is continuously released within a long temperature change range. At this time, the temperature corresponding to the maximum value of the energy-saving benefit E is about 98°C (such as Figure 18 ), but this point is not the optimal final temperature value because the heating energy efficiency at this time does not meet the access requirements of the national standard GB29541-2013 and the Development and Reform Commission's No. 1719 document (five-level energy efficiency). The COP value corresponding to "five-level energy efficiency" under this working condition is 3.6. After calculation, when the final temperature value is 109°C (COP value is 3.63), it just meets the "five-level energy efficiency" requirements. Therefore, under the second working condition, 109°C is the optimal final temperature value, and the system operation parameters corresponding to this temperature value are the optimal operation parameters under the second working condition.

[0088] Example 2

[0089] This embodiment provides an optimization device for the operating parameters of a vapor compression waste heat recovery heat pump system. The heat pump system is used to convert low-grade thermal energy absorbed from a heat extraction end into high-grade thermal energy that can be used by a heat utilization end and release it at the heat utilization end. Among them, the heat pump system uses a working medium to achieve the heat absorption and heat release processes. The optimization device includes: an acquisition module, configured to acquire the required temperature value of the heat utilization end and the initial temperature value of the heat extraction end; a determination module, configured to determine the optimal final temperature value of the heat extraction end under the condition of knowing the heat storage medium of the heat extraction end; when the heat storage medium of the heat extraction end releases heat and cools down to the optimal final temperature value, the heat pump system conforms to the optimal design rule; a calculation module, configured to calculate the optimal operating parameters of the heat pump system based on the required temperature value of the heat utilization end, the initial temperature value of the heat extraction end, and the optimal final temperature value. The operating parameters include: the energy-saving benefit, power consumption, heating energy efficiency, and heat supply of the heat pump system.

[0090] Preferably, in some embodiments of the present application, the calculation module further includes: a first calculation unit, configured to calculate the heating energy efficiency COP of the heat pump system through the following calculation formula: COP = A × η (1). In formula (1), A < 1 represents a system constant, and η represents the theoretical heating energy efficiency of the heat pump system. Its calculation formula is: In formula (1-1), t 2 represents the required temperature value of the heat utilization end, and t 1 represents the final temperature value of the heat extraction end; a second calculation unit, configured to calculate the power consumption W of the heat pump system according to the following calculation formula: In formula (2), ΔH 1 represents the enthalpy change of the heat storage medium of the heat extraction end, which is a known quantity; a third calculation unit, configured to calculate the heat supply ΔQ of the heat pump system according to the following calculation formula 2 : ΔQ 2 = ΔQ 1 + W = ΔH 1 + W (3). In formula (3), ΔQ 1 represents the heat absorbed by the heat pump system from the heat extraction end; a fourth calculation unit, configured to calculate the energy-saving benefit E of the heat pump system according to the following calculation formula: E = ΔQ 2 a - Wb (4). In formula (4), a represents the steam price per unit heat release (kW / h), and b represents the electricity price.

[0091] The modules and devices in this embodiment are used to implement the method in Embodiment 1.

[0092] The optimization device for the operating parameters of the vapor compression waste heat recovery heat pump system further includes a processor and a memory. The above acquisition module, determination module, and calculation module are all stored in the memory as program units, and the corresponding functions are implemented by the processor executing the above program modules stored in the memory.

[0093] The processor contains a kernel, which retrieves the corresponding program units from the memory. One or more kernels can be set, and the operating parameters of the vapor compression waste heat recovery heat pump system can be optimized by adjusting the kernel parameters.

[0094] The memory may include non-permanent memory in the form of computer-readable media, random access memory (RAM) and / or non-volatile memory such as read-only memory (ROM) or flash RAM, and the memory includes at least one memory chip.

[0095] An embodiment of the present application provides a storage medium with a program stored thereon, and when the program is executed by a processor, it implements the above-mentioned method for optimizing the operating parameters of the vapor compression waste heat recovery heat pump system.

[0096] Those skilled in the art should understand that the embodiments of the present application can be provided as a method, a system, or a computer program product. Therefore, the present application can take the form of a complete hardware embodiment, a complete software embodiment, or an embodiment combining software and hardware aspects. Moreover, the present application can take the form of a computer program product implemented on one or more computer-usable storage media (including but not limited to disk storage, CD-ROM, optical storage, etc.) containing computer-usable program code.

[0097] The present application is described with reference to the flowcharts and / or block diagrams of methods, devices (systems), and computer program products according to the embodiments of the present application. It should be understood that each process and / or block in the flowchart and / or block diagram can be implemented by computer program instructions, and the combination of the processes and / or blocks in the flowchart and / or block diagram can also be implemented by computer program instructions. These computer program instructions can be provided to the processor of a general-purpose computer, a special-purpose computer, an embedded processor, or other programmable data processing devices to generate a machine, so that the instructions executed by the processor of the computer or other programmable data processing devices generate a device for implementing the functions specified in Figure 1 one process or multiple processes and / or blocks Figure 1 one block or multiple blocks.

[0098] These computer program instructions can also be stored in a computer-readable memory that can direct a computer or other programmable data processing device to work in a specific manner, so that the instructions stored in the computer-readable memory generate a manufactured article including an instruction device, and the instruction device implements the functions specified in Figure 1 one process or multiple processes and / or blocks Figure 1 one block or multiple blocks.

[0099] These computer program instructions can also be loaded onto a computer or other programmable data processing device, so that a series of operation steps are executed on the computer or other programmable device to generate a computer-implemented process, and thus the instructions executed on the computer or other programmable device provide steps for implementing the functions specified in one process Figure 1 one process or multiple processes and / or blocks Figure 1 steps for the functions specified in one block or multiple blocks.

[0100] In a typical configuration, a computing device includes one or more processors (CPUs), an input / output interface, a network interface, and memory.

[0101] The memory may include non-permanent memory in the form of computer-readable media, random access memory (RAM) and / or non-volatile memory such as read-only memory (ROM) or flash memory (flash RAM). The memory is an example of computer-readable media.

[0102] Computer-readable media includes permanent and non-permanent, removable and non-removable media, and information storage can be implemented by any method or technology. The information can be computer-readable instructions, data structures, program modules, or other data. Examples of computer storage media include, but are not limited to, phase change memory (PRAM), static random access memory (SRAM), dynamic random access memory (DRAM), other types of random access memory (RAM), read-only memory (ROM), electrically erasable programmable read-only memory (EEPROM), flash memory or other memory technologies, compact disc read-only memory (CD-ROM), digital versatile disc (DVD) or other optical storage, magnetic cassette tapes, magnetic tape magnetic disk storage or other magnetic storage devices, or any other non-transmission media that can be used to store information accessible by a computing device. As defined herein, computer-readable media does not include transitory media such as modulated data signals and carrier waves.

[0103] It should also be noted that the term "comprising", "including" or any other variant thereof is intended to cover non-exclusive inclusion, so that a process, method, commodity or device including a series of elements not only includes those elements, but also includes other elements not expressly listed, or also includes elements inherent in such process, method, commodity or device. Without further limitation, an element defined by the statement "including one..." does not exclude the existence of another identical element in the process, method, commodity or device including the element.

[0104] The above are only embodiments of the present application and are not intended to limit the present application. For those skilled in the art, various changes and modifications can be made to the present application. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application shall be included within the scope of the claims of the present application.

Claims

1. An optimization method for operating parameters of a vapor compression waste heat recovery heat pump system, the heat pump system being used to convert low-grade thermal energy absorbed from a heat extraction end into high-grade thermal energy that can be used by a heat utilization end and releasing it at the heat utilization end, wherein, the heat pump system uses a working medium to achieve the heat absorption and heat release processes, and is characterized in that the optimization method includes: Obtaining the required temperature value of the heat utilization end and the initial temperature value of the heat extraction end; Under the condition of knowing the heat storage medium at the heat extraction end, determining the optimal final temperature value of the heat extraction end; when the heat storage medium at the heat extraction end releases heat and cools down to the optimal final temperature value, the heat pump system conforms to the optimal design rule; Calculating the optimal operating parameters of the heat pump system based on the required temperature value of the heat utilization end, the initial temperature value and the optimal final temperature value of the heat extraction end, and the operating parameters include: the energy-saving benefit, power consumption, heating coefficient of performance and heat supply of the heat pump system.

2. The optimization method according to claim 1, characterized in that, the heat pump system conforming to the optimal design rule means that the energy-saving benefit of the heat pump system reaches the maximum on the premise that the heating coefficient of performance meets the preset requirements.

3. The optimization method according to claim 1, characterized in that, the calculation formula of the heating coefficient of performance COP of the heat pump system is as follows: COP = A × η (1) In formula (1), A < 1, representing a system constant, and η represents the theoretical heating coefficient of performance of the heat pump system, and its calculation formula is: In formula (1-1), t 2 represents the required temperature value at the hot end, and t 1 represents the final temperature value at the hot end.

4. The optimization method according to claim 3, characterized in that, the power consumption W of the heat pump system can be calculated according to the following calculation formula: In formula (2), ΔH 1 represents the enthalpy change of the heat storage medium at the heat extraction end and is a known quantity.

5. The optimization method according to claim 4, characterized in that, The heat supply ΔQ of the heat pump system 2 has the following calculation formula: ΔQ 2 = ΔQ 1 + W = ΔH 1 + W (3) In formula (3), ΔQ 1 represents the heat absorbed by the heat pump system from the heat extraction end.

6. The optimization method according to claim 5, characterized in that, the calculation formula of the energy-saving benefit E of the heat pump system is as follows: E = ΔQ 2 a - Wb (4) In formula (4), a represents the steam price, and b represents the electricity price.

7. An optimization device for operating parameters of a vapor compression waste heat recovery heat pump system, the heat pump system being used to convert low-grade thermal energy absorbed from a heat extraction end into high-grade thermal energy that can be used by a heat utilization end and releasing it at the heat utilization end, wherein, the heat pump system uses a working medium to achieve the heat absorption and heat release processes, and is characterized in that the optimization device includes: An acquisition module for acquiring the required temperature value of the heat utilization end and the initial temperature value of the heat extraction end; A determination module for determining the optimal final temperature value of the heat extraction end under the condition of knowing the heat storage medium at the heat extraction end; when the heat storage medium at the heat extraction end releases heat and cools down to the optimal final temperature value, the heat pump system conforms to the optimal design rule; A calculation module for calculating the optimal operating parameters of the heat pump system based on the required temperature value of the heat utilization end, the initial temperature value and the optimal final temperature value of the heat extraction end, and the operating parameters include: the energy-saving benefit, power consumption, heating coefficient of performance and heat supply of the heat pump system.

8. The optimization method according to claim 7, characterized in that, the calculation module further includes: A first calculation unit for calculating the heating coefficient of performance COP of the heat pump system through the following calculation formula: COP = A × η (1), where in formula (1), A < 1 represents a system constant, and η represents the theoretical heating energy efficiency of the heat pump system, and its calculation formula is: In formula (1-1), t 2 represents the required temperature value at the heat-using end, and t 1 represents the final temperature value at the heat-extracting end; A second calculation unit for calculating the power consumption W of the heat pump system according to the following calculation formula: In formula (2), ΔH 1 represents the enthalpy change of the heat storage medium at the heat extraction end and is a known quantity; A third calculation unit, configured to calculate the heat supply ΔQ of the heat pump system according to the following calculation formula 2 :[[]]END]] ΔQ 2 = ΔQ 1 + W = ΔH 1 + W (3), in Equation (3), ΔQ 1 represents the heat absorbed by the heat pump system from the heat extraction end; A fourth calculation unit for calculating the energy-saving benefit E of the heat pump system according to the following calculation formula: E = ΔQ 2 a - Wb (4), where in formula (4), a represents the steam price and b represents the electricity price.

9. An electronic device, comprising a memory, a processor, and a computer program stored in the memory and executable on the processor, wherein, when the processor executes the computer program, it implements the optimization method for the operating parameters of the vapor compression waste heat recovery heat pump system according to any one of claims 1 to 6.

10. A machine-readable storage medium, having instructions stored thereon, wherein, when the instructions are executed by the processor, the processor is configured to execute the optimization method for the operating parameters of the vapor compression waste heat recovery heat pump system according to any one of claims 1 to 6.

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