Heat supply system of energy storage coupling heat pump and demand configuration method and heat supply method of heat supply system

Abstract

The invention provides a heat supply system of an energy storage coupling heat pump and a demand configuration method and a heat supply method of the heat supply system. The method comprises the steps of obtaining steam demand quantity of an application side; configuring equipment characteristic parameters of the energy storage module according to the steam demand quantity, wherein the equipment characteristic parameters comprise fused salt heat storage efficiency and fused salt heat storage lower limit working temperature; the water inlet temperature of the water inlet end of the heat pump device is adjusted according to the heat pump energy efficiency ratio, the fused salt heat storage efficiency and the fused salt heat storage lower limit working temperature, so that the first temperature difference between the second temperature and the water inlet temperature is within the preset temperature difference range; and the upper limit value of the first temperature of the heat storage water heated by the heat pump device is determined according to the fused salt heat storage lower limit working temperature and a set second temperature difference, and the running power of the heat pump device is determined in combination with the steam demand quantity and the valley electricity duration. The heat supply system is ensured to operate efficiently, the operation cost is remarkably reduced, and the advantages of being efficient, flexible and economical are achieved.

Description

Technical Field

[0001] The present application relates to the field of thermal energy utilization and energy storage technology, and specifically to a heating system of an energy storage coupled heat pump and its demand configuration method and heating method, which are suitable for efficient heating and steam supply in industrial and commercial scenarios. Background Art

[0002] In industrial and commercial scenarios, steam, as an important energy medium, is widely used for industrial heating, power drive, hot water supply and other purposes.

[0003] In the prior art, gas boilers or electric boilers are usually used to directly heat and generate steam.

[0004] However, these methods have problems of high energy consumption, high operating costs and large carbon emissions, which are inconsistent with the needs of modern energy optimization and energy conservation and emission reduction. Summary of the invention

[0005] The present application aims to solve the problems of low operating efficiency, high operating cost and insufficient adaptability of heat pump devices and energy storage modules in the prior art, and to provide a heating system of an energy storage coupled heat pump and its demand configuration method and heating method.

[0006] In a first aspect, the present application provides a demand configuration method for a heating system of an energy storage coupled heat pump, wherein the heating system comprises a heat pump device and an energy storage device, wherein a heat exchange medium is sequentially heated by the heat pump device and the energy storage device, and sequentially generates stored hot water having a first temperature and water vapor having a second temperature and used to supply a user end, and the equipment specifications of the heat pump device and the energy storage device are confirmed by the following steps:

[0007] S1: Obtain the steam demand on the application side, including steam supply and required steam temperature;

[0008] S2: configuring the equipment characteristic parameters of the energy storage module according to the steam demand, wherein the equipment characteristic parameters include the molten salt heat storage efficiency and the molten salt heat storage lower limit operating temperature;

[0009] S3: adjusting the water inlet temperature of the water inlet end of the heat pump device according to the heat pump energy efficiency ratio, the molten salt heat storage efficiency and the molten salt heat storage lower limit operating temperature, so that a first temperature difference between the second temperature and the water inlet temperature is within a preset temperature difference range;

[0010] S4: determining an upper limit value of the first temperature of the hot water heated by the heat pump device according to the lower limit operating temperature of the molten salt heat storage and the set second temperature difference, and confirming the operating power of the heat pump device in combination with the steam demand and the valley power duration.

[0011] In some technical solutions, the second temperature difference is set according to the minimum value of the sum of the heat pump power consumption and the molten salt power consumption, wherein;

[0012] The heat pump energy efficiency ratio and the second temperature difference have an approximate linear relationship of COP=κΔT2;

[0013] The power consumption of the heat pump is: E1 = (Q2-Q1) / COP;

[0014] The molten salt power consumption is: E2 = (Q3-Q2) / η = (λΔT2) / η;

[0015] The second temperature difference is set to satisfy the minimum value of E1+E2, i.e., min((Q2-Q1) / κΔT2+λΔT2 / η));

[0016] Wherein: COP is the energy efficiency ratio of the heat pump, ΔT2 is the second temperature difference, Q1 is the heat brought by the heat exchange medium input at the water inlet, Q2 is the hot water heat output by the heat pump device, Q3 is the steam heat output by the energy storage module; η is the molten salt heat storage efficiency, κ and λ are both constants.

[0017] In some technical solutions, the S4 further includes:

[0018] Based on the upper limit value of the first temperature of the stored hot water heated by the heat pump device and the second temperature difference, the lower limit operating temperature of the molten salt heat storage is reversed; based on the lower limit operating temperature of the molten salt heat storage, a molten salt that matches the working requirements of the energy storage module is selected.

[0019] Some technical solutions also include any one of the following conditions:

[0020] ① The water inlet temperature at the water inlet end is not higher than the upper limit value of the first temperature;

[0021] ② The ratio of the first temperature difference to the first temperature is 1 to 2;

[0022] ③ The preset temperature difference range of the first temperature difference is 90℃~290℃;

[0023] ④The preset temperature difference range of the second temperature difference is 10℃~100℃;

[0024] ⑤The setting range of the first temperature is 80℃~150℃, and the setting range of the second temperature is 100℃~300℃.

[0025] In some technical solutions, the heating system also includes a water storage device connected to the heat pump device and used to store the heated water. The pressure adjustment range of the water storage device is 0.1 MPa to 0.5 MPa.

[0026] In a second aspect, the present application further provides a heating system of an energy storage coupled heat pump, which is arranged according to a demand configuration method of a heating system of an energy storage coupled heat pump as described in the first aspect, including:

[0027] A heat pump device, used for heating the heat exchange medium to the first temperature to obtain hot water storage;

[0028] an energy storage device, connected to the heat pump device through a pipeline, and used for heating the stored hot water to water vapor having the second temperature; and

[0029] A control unit, the control unit comprising:

[0030] A first temperature monitoring module connected to the heat pump device, used to control the upper limit temperature of the first temperature to be within a set first threshold range;

[0031] A second temperature monitoring module connected to the energy storage device, used to control the lower limit temperature of the third temperature of the molten salt to be within a set second threshold range;

[0032] The first processing module connected to the first temperature monitoring module and the second temperature monitoring module is used to set the second temperature difference, and judge the stability of the operation of the heating system by comparing the second temperature difference with the calculated difference, and the calculated difference is the difference between the third temperature and the first temperature.

[0033] In some technical solutions, the energy storage device includes a plurality of the energy storage modules, and any two of the energy storage modules are connected in parallel or in series by switching between pipelines;

[0034] In the parallel operation mode, any of the energy storage modules operates independently, and the lower limit temperature of the third temperature is set to 70° C. to 190° C.;

[0035] In the series operation mode, at least two of the energy storage modules are connected in series, and the lower limit temperature setting value of the third temperature of the first energy storage module connected in the series structure is not lower than the melting point temperature of the molten salt.

[0036] Some technical solutions further include a second processing module, which is used to set the first temperature difference:

[0037] In the parallel operation mode, the first temperature difference is set in a range of 90° C. to 290° C.; or / and,

[0038] In the series operation mode, the first temperature difference is set in a range of 120°C to 310°C.

[0039] Some technical solutions further include a water storage device connected to the heat pump device and used to store the stored hot water at the first temperature, the water storage device includes a heat preservation water tank with a pressurization function, and the heat preservation water tank includes:

[0040] A pressure detection component is arranged inside the thermal insulation water tank and is used to monitor the pressure state inside the thermal insulation water tank in real time;

[0041] The pressure regulating component is used to adjust the internal pressure of the thermal insulation water tank according to the pressure state to maintain the liquid storage state of the stored hot water.

[0042] In a third aspect, the present application further provides a heating method of an energy storage coupled heat pump, comprising operating and controlling the heating system described in the second aspect or the device set up based on the configuration method of the first aspect, including the following steps:

[0043] During the off-peak period, the heat exchange medium is heated to a first temperature slightly lower than the saturation temperature by using the heat pump device, and stored in the water storage device;

[0044] During the heating period, the stored hot water at the first temperature is output from the water storage device and heated by the energy storage device to obtain water vapor at the second temperature.

[0045] The energy storage coupled heat pump heating system and its demand configuration method and heating method of the present application realize heat storage during off-peak hours and efficient steam supply during heating hours through efficient cooperation between the heat pump device and the energy storage module, and have significant technical advantages and economic effects, as follows:

[0046] 1. This application is based on the steam demand on the application side, accurately configures the parameters of the energy storage device and the final operation strategy of the heat pump, and realizes intelligent matching of equipment specifications. The inlet water temperature is adjusted by the steam volume and temperature demand, the molten salt heat storage efficiency is optimized, and the heat pump is ensured to operate in the optimal energy efficiency range; at the same time, the heat pump power is determined in combination with the valley power duration, which not only improves energy utilization, but also reduces operating costs, forming a demand-driven, efficient and coordinated heating system to ensure stable and economical steam supply.

[0047] 2. This application realizes efficient thermal energy utilization by synergistically optimizing the heat pump device and the energy storage device, and can dynamically adjust the operation strategy based on user needs, waste heat resources and electricity price differences, so as to make full use of the off-peak period to improve economic efficiency.

[0048] 3. This application uses a heat pump device to heat water to a first temperature slightly lower than the saturation temperature during off-peak hours, and stores the water in a pressurized insulated water tank. This not only makes full use of the low-cost electricity resources during off-peak hours, but also dynamically adjusts the internal pressure of the water storage device to ensure that the stored hot water remains in a liquid state, effectively reducing heat loss and improving the energy efficiency of the system operation. During the heating period, the energy storage device further heats the stored hot water to a second temperature that meets the steam demand, and dynamically adjusts the system operating state to reduce operating costs and improve heating efficiency. This application is suitable for steam supply and hot water heating in industrial and commercial scenarios, and is efficient, flexible, and economical. BRIEF DESCRIPTION OF THE DRAWINGS

[0049] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the following is a brief introduction to the drawings and their marks required for use in the embodiments. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0050] Figure 1 This is a schematic structural diagram of an energy storage coupled heat pump steam generation system according to an embodiment of the present application;

[0051] Figure 2 A schematic flow chart of a method for configuring demand for a heating system of an energy storage coupled heat pump according to an embodiment of the present application;

[0052] Figure 3 This is a flow chart of a heating method of an energy storage coupled heat pump according to an embodiment of the present application:

[0053] The meanings of the symbols in the figure are as follows:

[0054] 10—heat pump device, 20—water storage device, 30—energy storage device. DETAILED DESCRIPTION

[0055] In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the specific implementation methods of the present application will be described below with reference to the accompanying drawings. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings and other implementation methods can be obtained based on these drawings without creative work.

[0056] In order to simplify the drawings, only the parts related to the invention are schematically shown in each figure, and they do not represent the actual structure of the product. In addition, in order to simplify the drawings and facilitate understanding, in some figures, only one of the parts with the same structure or function is schematically drawn or marked. In this article, "one" not only means "only one", but also means "more than one".

[0057] It should be further understood that the term “or / and” used in the specification and appended claims refers to any combination and all possible combinations of one or more of the associated listed items, and includes these combinations.

[0058] In this document, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in this application can be understood according to specific circumstances.

[0059] In addition, in the description of the present application, the terms "first", "second", etc. are only used to distinguish the description and cannot be understood as indicating or implying relative importance.

[0060] In recent years, with the continuous development of heat pump technology, its high-efficiency energy conversion characteristics have gradually increased its application in the field of heating. However, the existing heat pump heating system usually fails to fully combine the energy storage device 30 to achieve efficient operation, for example: 1) The heat pump device 10 operating alone is limited in responding to high-temperature requirements (such as steam generation), and its maximum heating temperature is usually not enough to directly meet the high-temperature steam demand; 2) Although the energy storage device 30 (such as the molten salt energy storage module) can adapt to high-temperature steam generation, its efficient operation needs to be reasonably matched with the low-temperature heat source, and the traditional design lacks dynamic coordination capabilities, resulting in low energy efficiency of the heating system; 3) The existing scheme fails to effectively utilize the valley power period, fails to reduce the operating cost through the coordinated optimization of the heat pump and the energy storage module, and the operation logic of the heating system is single and difficult to adapt to load fluctuations. Therefore, how to make full use of the valley power period to achieve low-cost heating through the coordinated operation of the heat pump device 10 and the energy storage module, and at the same time improve the overall energy efficiency of the heating system through dynamic optimization, has become a technical problem that needs to be solved urgently.

[0061] The following describes the energy storage coupled heat pump heating system and its demand configuration method and heating method of the present application in conjunction with the drawings in the specification to solve the above-mentioned problems.

[0062] Reference Figure 1 and Figure 2 As shown, Figure 1 is a structural schematic diagram of a heating system of an energy storage coupled heat pump provided in an embodiment of the present application, Figure 2 It is a flow chart of a method for configuring the demand of a heating system of an energy storage coupled heat pump provided in an embodiment of the present application. Figure 2 The flowcharts shown in the figures or other figures show a logical order, but in some cases, the steps shown or described may be performed in a different order than shown in the figure. Figure 1 As shown, the heat supply system of the energy storage coupled heat pump includes a heat pump device 10 and an energy storage device 30. The heat exchange medium is sequentially heated by the heat pump device 10 and the energy storage device 30 to generate stored hot water with a first temperature T1 and water vapor with a second temperature T2 for supplying the user end. Figure 2 As shown, the confirmation of the equipment specifications of the heat pump device 10 and the energy storage device 30 is obtained by the following steps:

[0063] S1: Obtain the steam demand on the application side;

[0064] First, by obtaining the steam demand on the application side, the steam demand includes the steam supply and required steam temperature required by the user on the application side, among which the steam demand is positively correlated with the steam supply and the required steam temperature. The greater the steam supply, the greater the steam demand, and the greater the required steam temperature, the greater the steam demand. The steam demand varies according to the specific application scenario (such as industrial production, commercial heating, etc.) and may fluctuate in different time periods or seasons. Detailed data on steam supply and required steam temperature can provide a basis for the configuration of the entire heating system. This data input is the basis for all parameter configuration and adjustment in subsequent steps.

[0065] S2: configuring the equipment characteristic parameters of the energy storage module according to the steam demand, wherein the equipment characteristic parameters include the molten salt heat storage efficiency and the molten salt heat storage lower limit operating temperature;

[0066] Then, the energy storage device 30 is configured according to the steam demand, and the equipment characteristic parameters of the configured energy storage device 30 are obtained. The configuration of the energy storage device 30 depends on many factors, among which the most critical are the molten salt thermal storage efficiency η and the molten salt thermal storage lower limit operating temperature. The molten salt thermal storage efficiency η represents the efficiency of the energy storage module in storing and releasing heat, and the molten salt thermal storage lower limit operating temperature is the lowest temperature at which the molten salt can work effectively, which affects the low-temperature operation capability of the energy storage device 30, thereby determining whether the energy storage module can work stably in a low-temperature environment. These equipment characteristic parameters determine the working state and heat storage capacity of the energy storage device 30. For example, a high molten salt thermal storage efficiency means that heat can be stored more efficiently. According to the characteristics of the energy storage device 30, the heating system design can ensure efficient thermal energy storage and output capabilities under different temperature and load conditions.

[0067] S3: adjusting the water inlet temperature Tj at the water inlet end of the heat pump device 10 according to the heat pump energy efficiency ratio COP, the molten salt heat storage efficiency and the molten salt heat storage lower limit operating temperature, so that a first temperature difference ΔT1 between the second temperature T2 and the water inlet temperature Tj is within a preset temperature difference range;

[0068] Since the regulation of the first temperature difference ΔT1 is crucial, because an excessively large first temperature difference ΔT1 may lead to excessive heat loss, and an excessively small first temperature difference ΔT1 may lead to the device being unable to fully utilize the heat energy input by the heat pump device 10. Therefore, after configuring the device characteristic parameters of the energy storage device 30, the heating system needs to adjust the water inlet temperature Tj at the water inlet end of the heat pump device 10 through the heat pump energy efficiency ratio COP, the molten salt heat storage efficiency and the molten salt heat storage lower limit working temperature, so as to adjust the first temperature difference ΔT1 between the second temperature T2 of the water vapor and the water inlet temperature Tj. Among them, the heat pump energy efficiency ratio COP is a key parameter of the performance of the heat pump device 10, which represents the ratio of the heat pump output heat to the input work, which directly affects the heating efficiency of the heat pump device 10. The heat pump energy efficiency ratio COP is usually related to the heat pump inlet and outlet water temperature difference between the outlet water temperature of the heat pump device 10, that is, the first temperature T1 and the water inlet temperature Tj. Generally speaking, the heat pump energy efficiency ratio COP increases as the heat pump inlet and outlet water temperature difference decreases.

[0069] In this embodiment, the temperature of water vapor required by the user on the application side, i.e., the required steam temperature, is obtained, and the target water inlet temperature Tmj is calculated according to the first temperature difference ΔT1 of any value within the preset temperature difference range and the required steam temperature, i.e., Tmj=T2-ΔT1, and ΔT1∈(ΔT1min, ΔT1max), wherein ΔT1min and ΔT1max are the lower limit and upper limit of the preset temperature difference range, respectively. According to the heat pump energy efficiency ratio COP and the molten salt heat storage efficiency η, the operating parameters (e.g., operating power) of the heat pump device 10 are adjusted so that the water inlet temperature Tj at the water inlet end of the heat pump device 10 can reach the target water inlet temperature Tmj.

[0070] The present application ensures efficient operation of the heat pump device 10 and the energy storage device 30 by precisely adjusting the water inlet temperature Tj at the water inlet end and controlling the first temperature difference ΔT1 between the second temperature T2 and the water inlet temperature Tj within a preset temperature difference range, thereby ensuring maximum heat transfer and improving the energy efficiency of the entire heating system.

[0071] S4: determining the upper limit value of the first temperature T1 of the hot water heated by the heat pump device 10 according to the lower limit operating temperature of the molten salt heat storage and the set second temperature difference ΔT2, and confirming the operating power of the heat pump device 10 in combination with the steam demand and valley power duration.

[0072] In this embodiment, according to the lower limit working temperature T of the molten salt heat storage Ymin and the set second temperature difference ΔT2, further determine the upper limit value of the first temperature T1 of the heat pump device 10 to heat the hot water storage, that is, T1max = ΔT2 + the lower limit working temperature T of the molten salt heat storage Ymin . Through these parameters, the heating system can accurately control the output temperature of the heat pump to ensure that the stability of the heating system will not be affected by excessively high or low temperatures. In addition, the operating power of the heat pump device 10 can be calculated and confirmed in combination with the steam demand and the valley power duration. For example, the heat pump demand power value W1=Q*h / COP required for heating by the heat pump device 10 can be calculated based on the steam demand and the heat pump energy efficiency ratio. Then, the operating power of the heat pump device 10 is calculated by dividing the heat pump demand power value by the valley power duration, where Q is the steam demand and h is the enthalpy value increased by the heating of the heat pump device 10. It can be determined whether to turn on the waste heat source heat pump for heat pump heating based on the available waste heat resources (including valley power periods and heating periods); at the same time, it can be determined whether to turn on the air source heat pump for heat pump heating based on meteorological temperature conditions; h is determined based on the heating conditions of the waste heat source heat pump and the air source heat pump.

[0073] By obtaining the steam demand on the application side, the present application can ensure that the design and operation of the heating system are closely matched with the actual demand, avoid overheating or underheating, and thus improve the economy and reliability of the heating system. In addition, the present application configures the equipment characteristic parameters of the energy storage module according to the steam demand, which can ensure that the energy storage module can operate efficiently under different working conditions, especially to maintain stable operation in a low temperature environment, which helps to improve the energy efficiency and stability of the entire heating system. The present application adjusts the water inlet temperature Tj of the heat pump device 10 and accurately controls the first temperature difference ΔT1 within the preset temperature difference range, which can avoid excessive heat loss or low equipment efficiency. At the same time, adjusting the operating parameters according to the heat pump energy efficiency ratio and the molten salt heat storage efficiency can maximize the output efficiency of the heat pump and reduce energy waste. In addition, the present application combines the valley power duration and the steam demand to dynamically calculate and adjust the operating power of the heat pump, which can make full use of the low-priced electricity during the valley power period, and fully utilize the high-efficiency performance of the heat pump device 10 during the low-valley electricity price period to reduce the power load during the peak period, so as to achieve the effect of energy saving and cost reduction. In summary, through the coordinated optimization of the above steps, the entire heating system can achieve efficient, stable and economical operation, while reducing dependence on traditional energy, improving energy utilization efficiency, and meeting the requirements of sustainable development.

[0074] like Figure 2In order to further optimize the configuration of the energy storage device 30, the demand configuration method of the heating system will also: based on the upper limit value of the first temperature T1 of the hot water heated by the heat pump device 10 and the second temperature difference ΔT2, the lower limit operating temperature of the molten salt heat storage is reversed; based on the lower limit operating temperature of the molten salt heat storage, a molten salt that matches the working requirements of the energy storage module is selected.

[0075] In this embodiment, since the lower limit working temperature of the heat storage of the molten salt directly affects the working efficiency of the energy storage device 30 under different environmental conditions, the reasonable selection and configuration of the type of molten salt is the key to ensure the long-term and efficient operation of the heating system. This application analyzes the heat transfer process between the heat pump device 10 and the energy storage module, and combines the heat storage characteristics of the molten salt to establish a set of equations including the upper limit value of the first temperature T1, the second temperature difference ΔT2 and the lower limit working temperature of the molten salt heat storage. In this way, the lower limit working temperature of the molten salt heat storage can be obtained by reverse calculation of the upper limit value of the first temperature T1 of the hot water storage and the second temperature difference ΔT2, and the lower limit working temperature of the molten salt heat storage obtained by reverse calculation can be regarded as reverse deduction, and the upper limit value of the first temperature T1 of the hot water storage heated by the heat pump device 10 can be determined according to the lower limit working temperature of the molten salt heat storage and the set second temperature difference ΔT2 can be regarded as forward deduction. Through this forward deduction and reverse deduction to form feedback, the heating system can continuously adjust and optimize the parameters of the heat pump device 10 and the energy storage module to ensure that the overall performance of the heating system is optimal. Feedback formed by forward deduction and reverse deduction can ensure that the heat transfer and conversion efficiency between the heat pump device 10 and the energy storage module is optimized. For example, if the reverse deduction finds that the lower limit operating temperature of the molten salt heat storage is not suitable, the operating parameters of the heat pump device 10 (such as the upper limit value of the first temperature T1) can be adjusted to optimize the heat transfer efficiency of the entire heating system and improve the performance of the heating system. Through the feedback mechanism formed by forward deduction and reverse deduction, the heating system can dynamically adjust parameters according to the actual operating conditions, reduce energy waste, reduce operating costs, improve energy utilization efficiency, and reduce excessive load on equipment, extend the service life of equipment, and further reduce the maintenance and replacement costs of the heating system. In actual operation, the operating conditions of the heating system (such as steam demand, valley power duration, etc.) may change. Through the feedback mechanism, the heating system can adjust parameters in real time to adapt to the dynamic changes in operating conditions and ensure the stable operation of the heating system. By reverse deducing the lower limit operating temperature of the molten salt heat storage, the performance of the energy storage module can be avoided from being affected by excessively high or low temperatures, thereby enhancing the stability of the heating system.

[0076] Furthermore, after the lower limit working temperature of the molten salt heat storage is obtained by reverse calculation, the type of molten salt that matches the working requirements of the energy storage device 30 can be selected according to the lower limit working temperature of the molten salt heat storage obtained by reverse calculation. Of course, the cost, service life, decomposition temperature, thermal conductivity, and thermal stability of the molten salt can also be comprehensively considered to select a matching type of molten salt in combination with the lower limit working temperature of the molten salt heat storage. For example, for a heating system with a steam generation operating temperature range of 150°C to 400°C, a molten salt with a melting point temperature of about 100°C and a decomposition temperature of more than 450°C can be selected. In short, the melting point temperature of the selected molten salt type is lower than the lower limit working temperature of the molten salt heat storage. By reasonably selecting the molten salt, the efficient operation and long-term stability of the energy storage module in the heating system can be ensured.

[0077] Since the second temperature difference ΔT2 is directly related to the power consumption of the heat pump device 10 and the energy storage device 30, the setting of the second temperature difference ΔT2 is very important. In order to select a suitable second temperature difference ΔT2, the second temperature difference ΔT2 of the present application is set according to the minimum value of the sum of the heat pump power consumption E1 and the molten salt power consumption E2, wherein;

[0078] The heat pump energy efficiency ratio and the second temperature difference ΔT2 have an approximate linear relationship of COP=κΔT2;

[0079] The heat pump power consumption E1 is: E1 = (Q2-Q1) / COP;

[0080] The molten salt power consumption E2 is: E2 = (Q3-Q2) / η = (λΔT2) / η;

[0081] The second temperature difference ΔT2 is set to satisfy the minimum value of E1+E2, i.e., min((Q2-Q1) / κΔT2+λΔT2 / η));

[0082] Wherein: COP is the energy efficiency ratio of the heat pump, ΔT2 is the second temperature difference ΔT2, Q1 is the heat brought by the heat exchange medium input at the water inlet, Q2 is the hot water heat output by the heat pump device 10, Q3 is the steam heat output by the energy storage module; η is the molten salt heat storage efficiency, κ and λ are both constants.

[0083] In this embodiment, the minimum value of E1+E2 is derived by the above formula, and then the second temperature difference ΔT2 is calculated according to the minimum value of E1+E2. In this way, it can ensure that the entire heating system consumes the least amount of electricity during operation, directly reducing the operating cost of the heating system. Especially when it is running for a long time or applied on a large scale, the energy saving effect is significant and the electricity bill expenditure is greatly reduced, making the heating system more economical in long-term operation, which not only improves the commercial feasibility of the heating system, but also makes it more advantageous in market competition. The heat pump device 10 and the energy storage module heating are the main energy consumption units in the heating system. The second temperature difference ΔT2 calculated according to the minimum value of E1+E2 can balance the energy consumption of the heat pump device 10 and the energy storage module, so that the energy consumption of the two reaches the best balance, avoiding excessive energy consumption of a certain device, and improving the overall energy efficiency of the heating system. Moreover, the reasonable setting of the second temperature difference ΔT2 can ensure the efficient transfer of heat between the heat pump and the energy storage module, reduce heat loss, and further improve the stability and heating quality of the heating system. In addition, since there is a linear relationship between the heat pump energy efficiency ratio COP and the second temperature difference ΔT2, by setting the second temperature difference ΔT2 to meet the minimum value of E1+E2, it can be ensured that the heat pump device 10 always operates at a higher energy efficiency ratio, which means that the heat pump device 10 can output more heat while consuming less electricity, thereby improving the efficiency of the entire heating system. By dynamically adjusting the second temperature difference ΔT2, the heating system can flexibly adapt to various operating conditions according to different parameters such as steam demand, heat pump operating power, and valley power duration, and always maintain the optimal operating state. It can also ensure that the heat pump device 10 and the energy storage module operate within a reasonable temperature range, avoiding equipment failures or inefficient operation due to excessively high or low temperatures, thereby extending the service life of the equipment and improving the stability and reliability of the heating system.

[0084] In the demand configuration of the heating system of the energy storage coupled heat pump, in addition to optimizing the second temperature difference ΔT2, it is also necessary to ensure the reasonable settings of the water inlet temperature Tj, the first temperature difference ΔT1, the second temperature difference ΔT2, and the first temperature T1 and the second temperature T2. In order to ensure that the heating system can operate efficiently and stably, this embodiment also sets several key parameter restriction conditions, which require any one of conditions ① to ⑤:

[0085] ① The water inlet temperature Tj at the water inlet end is not higher than the upper limit value of the first temperature T1. Maintaining the water inlet temperature Tj at the water inlet end within a reasonable range is crucial to improving the energy efficiency of the heating system. Therefore, the water inlet temperature Tj of the heat pump device 10 is set not to be higher than the upper limit value of the first temperature T1 when it is working. This means that the water inlet temperature Tj cannot exceed the upper limit temperature of the hot water storage to avoid excessively high water inlet temperature Tj affecting the heating efficiency of the heat pump device 10 or causing instability in the heating system. Because, if the water inlet temperature Tj is too high, the heat pump device 10 may not be able to effectively utilize the input heat energy for heating, or additional energy may be required to lower the temperature, thereby increasing energy consumption and the complexity of the heating system. Therefore, the present application ensures that the heat pump device 10 operates under efficient and stable conditions by ensuring that the water inlet temperature Tj is not higher than the upper limit value of the first temperature T1, while avoiding heat backflow in the heating system and improving the energy efficiency and reliability of the entire heating system.

[0086] ②The ratio of the size of the first temperature difference ΔT1 to the first temperature T1 is 1 to 2. The ratio of the size of the first temperature difference ΔT1 to the first temperature T1 should be controlled in a reasonable proportion. This means that the size of the first temperature difference ΔT1 should be proportional to the first temperature T1 to ensure that the temperature difference is not too large or too small, so as to ensure the high efficiency of heat transfer and the stability of the equipment. If the temperature difference is too large, it may lead to excessive heat energy loss; while if the temperature difference is too small, effective heat energy conversion may not be achieved. Therefore, when the ratio between the first temperature difference ΔT1 and the first temperature T1 is between 1 and 2, it can ensure that the heat pump device 10 and the energy storage device 30 operate within a reasonable temperature difference range, which can effectively transfer heat and avoid the decrease in heat pump energy efficiency or equipment damage caused by excessive temperature difference, thereby improving the overall efficiency of the heating system. At the same time, this ratio range can optimize the selection and operation parameters of the heat pump device 10, so that it can meet the heating demand while minimizing energy consumption and improving the economy and stability of the heating system.

[0087] ③The preset temperature difference range of the first temperature difference ΔT1 is 90℃~290℃. The temperature difference range of 90℃~290℃ can not only meet the demand for high-temperature hot water or steam in most industrial and civil heating scenarios, but also ensure that the heat pump device 10 operates efficiently within a reasonable temperature difference range. Too large a temperature difference may reduce the energy efficiency of the heat pump device 10 or even exceed its operating range; while too small a temperature difference may not be able to meet the user's heating needs. Therefore, by limiting the first temperature difference ΔT1 to the range of 90℃~290℃, it can ensure that the heating system maintains high energy efficiency and operational stability while meeting user needs, and also helps to extend the service life of the equipment. This range can stably heat the stored hot water and supply heat to the energy storage device 30, ensuring the effective transfer of heat from the heat pump device 10 to the energy storage device 30, while avoiding energy waste or equipment overload caused by excessive temperature differences.

[0088] ④The preset temperature difference range of the second temperature difference ΔT2 is 10℃~100℃. The range setting of the second temperature difference ΔT2 is also to optimize the overall performance of the heating system. By setting the preset temperature difference range of the second temperature difference ΔT2 to 10℃~100℃, it can not only ensure that the energy storage module (such as the molten salt heat storage heating system) can effectively transfer heat to the heat pump device 10, but also avoid heat loss or unstable equipment operation caused by excessive temperature difference. By reasonably controlling the second temperature difference ΔT2, it can ensure that the heat exchange between the heat pump device 10 and the energy storage module is more efficient, and it also helps to reduce the energy consumption and operating costs of the heating system. In addition, the flexibility and adaptability of the heating system can be improved, so that it can better cope with different heating needs and operating conditions, and ensure that the energy storage device 30 can heat the hot water to the required steam temperature.

[0089] ⑤The setting range of the first temperature T1 is 80℃~150℃, and the setting range of the second temperature T2 is 100℃~300℃. The setting range of the first temperature T1 and the second temperature T2 takes into account the actual application requirements of the heating system and the operating characteristics of the equipment. The setting range of the first temperature T1 is 80℃~150℃, which can meet the needs of most industrial and civil scenarios for high-temperature hot water, and is also suitable for the efficient operating range of the heat pump device 10. The setting range of the second temperature T2 is 100℃~300℃, which can meet the user's needs for high-temperature steam and is suitable for various industrial processes and special applications. By reasonably setting these two temperature ranges, it can be ensured that the heating system maintains high energy efficiency and operating stability while meeting user needs, and it also helps to optimize the overall configuration and operating cost of the heating system. By setting these two temperatures, it is ensured that the heating system can provide sufficient hot water and steam under different load conditions, while avoiding the instability of the heating system caused by excessively high or low temperatures.

[0090] In summary, the setting of conditions ① to ⑤ helps to optimize the overall performance of the heating system, improve energy efficiency, reduce costs, and ensure the stability and reliability of the heating system so that it can better meet the needs of users.

[0091] Through the above design steps, the heating system can flexibly adjust key parameters such as the water inlet temperature, temperature difference, and temperature of the hot water storage under different load conditions to ensure that the energy storage coupled heat pump device 10 operates efficiently and stably. In this step, the upper limit setting of the water inlet temperature and the requirement for the ratio of the first temperature difference ΔT1 to the first temperature T1 help control the heat transfer efficiency of the heating system, while avoiding the impact of excessive temperature difference or excessive temperature on the performance of the heating system. These designs further improve the overall energy efficiency and stability of the energy storage coupled heat pump heating system.

[0092] In addition to the optimization of temperature difference and temperature, the heating system further includes a water storage device 20 connected to the heat pump device 10 for storing the stored hot water. The pressure adjustment range of the water storage device 20 is 0.1 MPa to 0.5 MPa.

[0093] By setting a water storage device 20 for storing hot water, a certain pressure can be maintained in the heating system to avoid water supply interruption or instability caused by pressure fluctuations, and the water storage device 20 can provide a stable water inlet condition for the heat pump to ensure that the heat pump works in an efficient operation range. In addition, by setting the pressure adjustment range to 0.1MPa~0.5MPa, the heating system can better cope with instantaneous load changes, ensure the continuity and stability of hot water supply, and ensure that the hot water is stored under appropriate pressure, and effectively avoid energy efficiency loss or equipment failure caused by excessive or insufficient pressure. In addition, by setting the pressure adjustment range to 0.1MPa~0.5MPa, the residual pressure in the heating system can be fully utilized by reasonably adjusting the pressure range, reducing additional pressurization energy consumption, and the heat exchange efficiency of the heat pump is higher, while reducing equipment wear caused by insufficient or excessive pressure. By setting the water storage device 20 and reasonably controlling the pressure range, the stability, energy saving, safety and economy of the heating system can be effectively improved.

[0094] This application can accurately configure the heating system of the energy storage coupled heat pump through the above-mentioned demand configuration method of the heating system of the energy storage coupled heat pump, and ensure stable and efficient heating under different load conditions. By accurately configuring the heat pump device 10 and the energy storage device 30, and performing a series of parameter optimizations, it is ensured that the heating system operates efficiently and stably while meeting the steam demand, so that the heating system can minimize energy consumption while meeting the steam demand, and improve the overall economic benefits and environmental adaptability. The above-mentioned demand configuration method provides an efficient and flexible solution for the energy storage coupled heat pump heating system, which is suitable for a variety of industrial and commercial application scenarios.

[0095] Reference Figure 1 As shown, Figure 1 Schematic diagram of a heating system of an energy storage coupled heat pump provided in an embodiment of the present application. The heating system of an energy storage coupled heat pump is used to efficiently utilize valley electricity resources and meet user steam needs. Figure 1 As shown, the energy storage coupled heat pump heating system includes: a heat pump device 10, an energy storage device 30, a control unit and a matching pipeline heating system. The various components work together to form an efficient and energy-saving heating system.

[0096] The heat pump device 10 is used to heat the heat exchange medium to the first temperature T1 to obtain hot water storage;

[0097] The energy storage device 30 is connected to the heat pump device 10 through a pipeline, and is used to heat the stored hot water to water vapor having the second temperature T2; and

[0098] A control unit, the control unit comprising:

[0099] A first temperature T1 monitoring module connected to the heat pump device 10, used to control the upper limit temperature of the first temperature T1 to be within a set first threshold range;

[0100] A second temperature T2 monitoring module connected to the energy storage device 30, used to control the lower limit temperature of the third temperature T3 of the molten salt to be within a set second threshold range;

[0101] The first processing module connected to the first temperature T1 monitoring module and the second temperature T2 monitoring module is used to set the second temperature difference ΔT2, and judge the stability of the operation of the heating system by comparing the second temperature difference ΔT2 with the calculated difference, and the calculated difference is the difference between the third temperature T3 and the first temperature T1.

[0102] In this embodiment, the heating system includes a heat pump device 10, an energy storage device 30 and a control unit. The control unit is the core part of the heating system and is responsible for real-time monitoring and adjustment of various devices. The control unit includes a first temperature T1 monitoring module, a second temperature T2 monitoring module and a first processing module. The heat pump device 10 is connected to the energy storage device 30 through a pipeline. The first temperature T1 monitoring module of the control unit is connected to the heat pump device 10, the second temperature T2 monitoring module of the control unit is connected to the energy storage device 30, and the first processing module is connected to the first temperature T1 monitoring module and the second temperature T2 monitoring module respectively.

[0103] The heat exchange medium is input from the water inlet end of the heat pump device 10, and the heat exchange medium is heated by the heat pump device 10. The heat pump device 10 is used to operate during the valley electricity period, and the low-priced electricity during the valley electricity period is used to heat the heat exchange medium (such as water) to obtain hot water storage of the first temperature T1. The temperature control of the heat pump device 10 is adjusted by setting the upper limit value of the first temperature T1 to prevent excessively high or low temperatures from affecting the working efficiency of the heat pump device 10. The heat pump device 10 includes a waste heat source heat pump and an air source heat pump to adapt to different operating conditions and heat source conditions. The waste heat source heat pump is used to use the low-level waste heat of the plant area to preliminarily heat the heat exchange medium. When the low-level waste heat of the plant area is insufficient or unavailable, the air source heat pump is operated to provide heat to preliminarily heat the heat exchange medium. Furthermore, the waste heat source heat pump and the air source heat pump are preferably designed with a transcritical carbon dioxide working fluid, and the heat exchange medium is preliminarily heated to the first temperature T1 directly by an open cycle heating method, without the need for an additional circulating pump, thereby obtaining a higher temperature rise capacity and significantly simplifying the device structure. The heat pump device 10 with a transcritical carbon dioxide working fluid can more efficiently utilize waste heat or air heat sources, and achieve efficient operation and cost reduction of the equipment through an optimized cycle design. The flexible design of the heat pump device 10 can not only fully utilize the waste heat resources under factory conditions, but also provide stable storage hot water output under different heat source conditions, thereby improving the efficiency and adaptability of the overall operation of the heating system.

[0104] The energy storage device 30 is connected to the heat pump device 10 through a pipeline, and the stored water obtained by the heat pump device 10 is further heated to the second temperature T2, thereby generating the required water vapor. The function of the energy storage device 30 is to store and regulate heat to ensure the continuity and stability of the steam supply. The energy storage device 30 can not only balance the load fluctuations, but also achieve the best thermal energy storage and utilization effect through intelligent regulation. The energy storage device 30 preferably uses low-melting-point molten salt as the heat storage medium. The melting point of the molten salt is lower than 100°C, and the stored water of the first temperature T1 generated by the heat pump device 10 can be heated by deep heat release to obtain water vapor of the second temperature T2. For example, in a specific embodiment, the second temperature T2 is 180°C, and the energy storage device 30 transfers heat to the stored water through the heat exchange pipeline and converts it into water vapor of the second temperature T2.

[0105] In addition, the first temperature T1 monitoring module controls the upper limit temperature of the first temperature T1 to be within the set first threshold range. The first temperature T1 monitoring module monitors the first temperature T1 of the hot water storage output by the heat pump device 10 in real time, and controls the upper limit temperature of the first temperature T1 by adjusting the operating parameters (such as operating power and water inlet flow) of the heat pump device 10. For example, when the upper limit temperature of the first temperature T1 is close to or exceeds the upper limit value of the first threshold range, the heating speed of the hot water storage is slowed down by reducing the operating power of the heat pump device 10, so as to control the upper limit temperature of the first temperature T1 not to exceed the upper limit value of the first threshold range; conversely, when the upper limit temperature of the first temperature T1 is lower than the lower limit value of the first threshold range, the operating power of the heat pump device 10 is appropriately increased to speed up the heating of the hot water storage, so that its temperature rises to maintain within the first threshold range. The upper limit temperature of the first temperature T1 is controlled within the set first threshold range by the first temperature T1 monitoring module to prevent the first temperature T1 from being too high or too low, and ensure that the heat pump device 10 always operates within the temperature range with the best energy efficiency, thereby improving the overall energy efficiency and extending the service life of the equipment.

[0106] In addition, the second temperature T2 monitoring module controls the lower limit temperature of the third temperature T3 of the molten salt to be within the set second threshold range, and the second temperature T2 monitoring module monitors the third temperature T3 of the molten salt in the energy storage device 30 in real time, and controls the lower limit temperature of the third temperature T3 by adjusting the operating parameters (such as the molten salt flow rate) of the energy storage device 30. For example, when the lower limit temperature of the third temperature T3 is close to or exceeds the upper limit value of the second threshold range, the molten salt flow rate is appropriately reduced to reduce its circulation speed to slow down the heating rate of the molten salt, thereby controlling the lower limit temperature of the third temperature T3 not to exceed the upper limit value of the second threshold range; conversely, when the lower limit temperature of the third temperature T3 is lower than the lower limit value of the second threshold range, the molten salt flow rate is increased to increase the circulation speed of the molten salt in the energy storage device 30, so that the molten salt absorbs the heat transferred by the heat pump device 10 faster, thereby increasing its temperature, and making its temperature rise to remain within the second threshold range. Since the temperature of the molten salt is one of the key parameters for the operation of the energy storage device 30, the lower limit temperature of the third temperature T3 of the molten salt is controlled by the second temperature T2 monitoring module to be within the set second threshold range, thereby ensuring maximum storage of heat during the energy storage process and avoiding a decrease in energy storage efficiency due to excessively low temperature, thereby ensuring that the heating system can operate stably under different load conditions.

[0107] The first processing module is a key component of the control unit of the heating system. The first processing module determines the operating stability of the heating system by setting the second temperature difference ΔT2. Among them, the comparison between the second temperature difference ΔT2 and the calculated difference is an important link in the control and stable operation of the heating system. The calculated difference refers to the difference between the third temperature T3 (molten salt temperature) and the first temperature T1 (hot water storage temperature), which reflects the temperature difference between the molten salt and the hot water storage in the energy storage device 30. By comparing the size of ΔT2 with the calculated difference, it can be determined whether the heating system is in a stable operating state. When ΔT2 is greater than the calculated difference, it indicates that the hot water heat output by the heat pump device 10 is insufficient to meet the demand of the energy storage device 30 to heat the hot water storage into steam, and the heating system may have insufficient heat supply. At this time, the operating power or water inlet temperature Tj of the heat pump device 10 can be adjusted to increase the heat output and ensure the stable operation of the heating system. When ΔT2 is less than the calculated difference, it means that the hot water heat output by the heat pump device 10 exceeds the demand of the energy storage device 30, which may cause the heating system to overheat. At this time, the operating power of the heat pump device 10 can be reduced or other related parameters can be adjusted to prevent excessive temperature from causing damage to the equipment and the heating system. When ΔT2 is equal to the calculated difference, it indicates that the heating system is in a balanced state, the output of the heat pump device 10 matches the demand of the energy storage device 30, and the heating system operates relatively stably.

[0108] Since the second temperature difference ΔT2 is closely related to the difference between the third temperature T3 and the first temperature T1, the present application monitors the first temperature T1 of the stored hot water in real time and controls the upper limit temperature of the first temperature T1 within the set first threshold range, and monitors the third temperature T3 of the molten salt in real time and controls the lower limit temperature of the third temperature T3 of the molten salt within the set second threshold range. The stability of the operation of the heating system is judged based on the size of the second temperature difference ΔT2 and the calculated difference, and the above-mentioned corresponding adjustment measures are taken according to the judgment result. The heating system can ensure the heat transfer and storage efficiency between the heat pump device 10 and the energy storage device 30, achieve dynamic balance, and ensure stable and efficient supply of steam under different working conditions to meet the heating needs of users on the application side.

[0109] In a specific implementation, the energy storage device 30 includes a plurality of the energy storage modules, and any two of the energy storage modules are connected in parallel and in series by switching between pipelines; in the parallel operation mode, any one of the energy storage modules operates independently, and the lower limit temperature of the third temperature T3 is set to 70°C to 190°C; in the series operation mode, at least two of the energy storage modules are connected in series, and the lower limit temperature setting value of the third temperature T3 of the first energy storage module connected in the series structure is not lower than the melting point temperature of the molten salt.

[0110] In the parallel mode of the present application, multiple energy storage devices 30 can operate independently. Such a configuration increases the redundancy of the heating system and avoids the impact of a single energy storage module failure on the overall heating system. Even if one of the energy storage modules fails, the other modules can still operate normally, ensuring the continuity and stability of the heating system. In the parallel mode, the temperature and energy storage capacity of each energy storage module can be adjusted independently to ensure that the heating system can efficiently provide the required heat energy. In addition, in the parallel mode, the lower limit temperature of the third temperature T3 is set to 70°C to 190°C. This temperature range ensures that the energy storage module can work efficiently and does not reduce the energy storage efficiency due to too low a temperature. In the series mode, multiple energy storage modules are connected in series through pipelines. In this way, the heat output by the previous energy storage module will be supplied to the next energy storage module for heating, thereby improving the heat transfer efficiency. The series mode is particularly suitable for application scenarios with large demands and can enhance the heat output capacity of the heating system. In the series mode, the lower limit temperature of the third temperature T3 of the first energy storage module is set to be no lower than the melting point temperature of the molten salt, ensuring that the energy storage device 30 can continuously and efficiently store and release heat.

[0111] By reasonably setting the operating parameters of the energy storage module, thermal energy can be used more efficiently and the energy utilization efficiency of the entire heating system can be improved. The present application can flexibly adjust the working mode of the energy storage module according to different heating needs and operating conditions by switching between parallel and series, so as to better meet the steam demand of the user end. The heating system is made more flexible and diverse in operation mode, and can better adapt to different working conditions and user needs, while improving the reliability and operation efficiency of the heating system, and improving the flexibility and adaptability of the heating system. Moreover, the energy storage device 30 of the present application modularly designs multiple energy storage modules, and realizes parallel connection and series connection by switching between pipelines, so that the maintenance of the heating system is more convenient, and a certain energy storage module can be maintained or replaced separately without affecting the operation of the entire heating system. In addition, by combining multiple energy storage modules in the energy storage device 30, the total heat storage amount of the heating system can be increased to better cope with the peak load demand at the user end.

[0112] In some embodiments, the heating system also includes a second processing module, which is configured to set the first temperature difference ΔT1: in the parallel operation mode, the setting range of the first temperature difference ΔT1 is 90℃~290℃; or / and, in the series operation mode, the setting range of the first temperature difference ΔT1 is 120℃~310℃.

[0113] In this embodiment, the second processing module adjusts the first temperature difference ΔT1 according to the operation mode of the energy storage device 30, that is, the parallel or series connection of multiple energy storage modules. In the parallel mode, each energy storage module operates independently, and the water inlet temperature Tj is relatively uniform. Therefore, the setting range of the first temperature difference ΔT1 in the parallel mode is 90°C to 290°C. By setting a larger first temperature difference ΔT1 (90°C to 290°C), it can be ensured that the heat pump device 10 can efficiently transfer heat to the energy storage module, reduce the operation time of the heat pump, thereby improving the overall operation efficiency of the heating system, and can better utilize the heat pump energy efficiency ratio of the heat pump device 1, reduce energy waste, and ensure that the heating system operates efficiently during the valley power period and optimize energy utilization. When operating in parallel mode, each energy storage module works independently. Even if a certain energy storage module fails, it will not affect the operation of the entire heating system. Therefore, setting a larger first temperature difference ΔT1Δ can better adapt to different operating conditions, improve the flexibility of the heating system, and ensure that each energy storage module can reach the required temperature, thereby providing users with stable hot water and steam and improving the quality of heating.

[0114] In the series mode, multiple energy storage modules are connected in series through pipelines, so that the heat output by the previous energy storage module will be supplied to the next energy storage module for heating, realizing heat transfer step by step. Therefore, the setting range of the first temperature difference ΔT1 in the series mode is 120℃ to 310℃. By setting a larger first temperature difference ΔT1 (120℃~310℃), it can be ensured that each energy storage module can obtain enough heat, avoiding insufficient heat transfer due to too small temperature difference, and ensuring that heat is efficiently transferred between multiple energy storage modules, making full use of the heat storage capacity of molten salt, reducing heat loss, and optimizing energy utilization. In addition, when operating in series mode, by setting a larger first temperature difference ΔT1Δ, it can ensure that the heating system can operate stably under different working conditions, avoiding the instability of the heating system due to too small temperature difference, and ensuring that heat is transferred step by step, ultimately providing users with high-quality steam.

[0115] The present application sets different setting ranges of the first temperature difference ΔT1 through the operating mode of the energy storage device 30, thereby ensuring that under different operating modes, the heating system can effectively adjust the heat transfer efficiency and energy efficiency according to the load demand, avoiding the negative impact of excessive or small temperature difference on the stability of the heating system, and can effectively improve the operating efficiency of the heating system, optimize energy utilization, enhance the flexibility and stability of the heating system, and improve the heating quality.

[0116] This embodiment enables the energy storage coupled heat pump heating system to operate efficiently under various load conditions through precise equipment configuration and optimized working mode. Through the coordinated work of various parts such as the heat pump device 10, the energy storage device 30, the temperature monitoring module, and the temperature difference module, the heating system can adjust the temperature, temperature difference and pressure parameters according to real-time needs, thereby ensuring the continuity and efficiency of steam supply. In addition, flexible parallel and series mode switching, reasonable temperature difference setting, and temperature monitoring and adjustment ensure that the heating system can operate stably and efficiently in various environments. This technical solution has a wide range of applicability in multiple industrial and commercial heating applications, and can achieve energy-saving, stable and efficient heating goals.

[0117] In some embodiments, the heating system further includes a water storage device 20, connected to the heat pump device 10, for storing the stored hot water at the first temperature T1, the water storage device 20 includes a heat preservation water tank with a pressurization function, and the heat preservation water tank includes:

[0118] A pressure detection component is arranged inside the thermal insulation water tank and is used to monitor the pressure state inside the thermal insulation water tank in real time;

[0119] The pressure regulating component is used to adjust the internal pressure of the thermal insulation water tank according to the pressure state to maintain the liquid storage state of the stored hot water.

[0120] In this embodiment, the water storage device 20 includes an insulated water tank with a pressurizing function, which is used to store the hot water stored at the first temperature T1 heated by the heat pump device 10, and dynamically adjusts the internal pressure of the insulated water tank, for example, the pressure adjustment range is 0.1MPa to 0.5MPa, so as to ensure that the hot water stored is kept in a liquid state when it is higher than 100°C. The insulated water tank includes a pressure detection component and a pressure regulating component. The pressure detection component is arranged inside the water storage device 20, and is used to monitor its internal pressure in real time, and feed back the monitoring result to the pressure regulating component. The pressure regulating component adjusts the internal pressure of the water storage device 20 according to the feedback information of the pressure detection component to ensure that it always maintains a liquid storage state. Specifically, the pressure regulating component includes a pressure pump arranged in the water inlet or internal pipeline of the water storage device 20, which is used to actively pressurize the water storage device 20, and automatically adjust the pressure level in the water tank according to the change of the internal pressure. The pressure pump is driven by a control unit, and its operating parameters are set according to the heating temperature of the heat pump device 10 to ensure that the internal pressure of the water tank is always within a safe range for keeping the hot water stored in a liquid storage state.

[0121] For example, when the first temperature T1 is higher than 100°C, the internal pressure of the water storage device 20 is adjusted to 0.2-0.3MPa by the control unit driving the pressure pump, and the specific value of the pressure is associated with the maximum heating temperature of the heat pump device 10 and the set third temperature difference (such as 5°C), thereby preventing the vaporization of the stored hot water, reducing heat loss and optimizing the operating efficiency of the heat pump device 10. In addition, the heat preservation structure of the water storage device 20 further ensures that the stored hot water can be stored efficiently and stably to meet the heating demand by reducing heat loss.

[0122] Reference Figure 3 As shown, Figure 3 Schematic diagram of a flow chart of a heating method of an energy storage coupled heat pump provided in an embodiment of the present application. Figure 3 As shown, the heating method of energy storage coupled heat pump includes the following steps:

[0123] During the off-peak period, the heat exchange medium is heated to a first temperature T1 slightly lower than the saturation temperature by the heat pump device 10, and stored in the water storage device 20;

[0124] During the heating period, the stored warm water at the first temperature T1 is output from the water storage device 20 and heated by the energy storage device 30 to obtain water vapor at the second temperature T2.

[0125] In this embodiment, during the off-peak period, the heating system starts the heat pump device 10, and the heat pump device 10 uses the low-priced electricity resources during the off-peak period to heat the water to a first temperature T1 slightly lower than the saturation temperature, which can reduce the power consumption during the peak period, so that the water storage device 20 can provide hot water storage at the first temperature T1 in time during the heating period. Among them, the saturation temperature is greater than the first temperature T1, and the saturation temperature refers to the temperature when the liquid and the gas are in a dynamic equilibrium state under a certain pressure. The saturation temperature is closely related to the pressure, and the value of the saturation temperature is different under different pressures. For example, for water, its saturation temperature is 100°C under standard atmospheric pressure (1atm). When the pressure increases, the saturation temperature will also increase; when the pressure decreases, the saturation temperature will decrease. In addition, the first set temperature difference (2°C to 10°C) between the first temperature T1 and the corresponding saturation temperature can be flexibly adjusted according to the actual control accuracy, further optimizing the performance coefficient (such as COP) of the heat pump device 10, and significantly reducing the operating energy consumption.

[0126] The heat pump device 10 uses its heat pump energy efficiency ratio COP to heat water to the first temperature T1, and then stores the obtained hot water in the water storage device 20. The heat preservation design of the water storage device 20 ensures that the hot water does not suffer excessive heat loss during the storage process, thereby reducing the energy consumption of the entire heating system.

[0127] During the heating period, the heating system outputs hot water of the first temperature T1 from the water storage device 20, and the hot water will be directly supplied to the energy storage device 30. The energy storage device 30 is based on the characteristics of the heat storage medium (such as molten salt) that can release heat deeply. When the hot water enters the energy storage device 30, the heat storage medium will further heat the hot water to the second temperature T2, which is usually close to or reaches the temperature required for steam generation (for example, 180°C), thereby generating the required water vapor. At this time, the hot water in the water storage device 20 has been heated and stored by the heat pump device 10, ensuring that the heating system can respond quickly to the steam demand and avoiding heating delays caused by waiting for the heating process. During the heating period, the main function of the water storage device 20 is to provide a constant source of hot water storage to ensure that the heating system is supplemented by the backup water storage device 20 when the hot water storage is insufficient, thereby ensuring the continuity and stability of the heating process.

[0128] The selection and design of the energy storage device 30 are crucial to improving the efficiency of the heating system. According to different thermal energy requirements, the heating system can flexibly adjust the operating temperature and heat release capacity of the energy storage device 30 to ensure that sufficient steam can be provided during peak steam demand. In actual applications, the heat release power of the energy storage device 30 and the heating capacity of the heat pump device 10 are adjusted according to real-time needs to ensure that the heating system always operates within the optimal working range. The present application makes full use of the high energy efficiency of the heat pump device 10 and the low-priced electricity during off-peak hours, heats water through a heat pump during off-peak hours, and further heats it to the required steam temperature through the energy storage device 30 during the heating period, thereby achieving efficient use of energy and reducing energy consumption and operating costs.

[0129] In the practical application of this method, the working mode of the heating system can be flexibly switched according to different steam demands. When the steam demand is high, the heating system can operate multiple energy storage devices 30 in parallel mode to ensure rapid steam supply; when the steam demand is low, the heating system switches to series mode to maximize the use of the heat released in the energy storage device 30. Switching between parallel and series modes can improve the adaptability and flexibility of the heating system and ensure efficient operation under different load conditions.

[0130] This embodiment ensures efficient and stable operation of the heating system by using the heat pump device 10 to efficiently heat water during off-peak hours, and further heating it to the required steam temperature through the energy storage device 30 during the heating period. Through precise temperature control, flexible working mode switching and energy efficiency optimization, the present invention provides an economical, efficient, energy-saving and environmentally friendly heating solution, which not only reduces power consumption, but also improves the adaptability and stability of the heating system, providing an ideal technical path for a wide range of industrial and commercial steam heating applications.

[0131] The above-mentioned embodiments only express several implementation methods of the present application, and the descriptions thereof are relatively specific and detailed, but they cannot be understood as limiting the scope of the patent of the present application. It should be pointed out that, for ordinary technicians in this field, several variations and improvements can be made without departing from the concept of the present application, and various implementation steps can be combined, which all belong to the protection scope of the present application; therefore, the protection scope of the present application shall be subject to the attached claims.

Claims

1. A method for configuring demand for a heating system of an energy storage coupled heat pump, characterized in that: The heating system includes a heat pump device and an energy storage device. The heat exchange medium is sequentially heated by the heat pump device and the energy storage device to sequentially generate stored hot water with a first temperature and water vapor with a second temperature for supplying a user end. The equipment specifications of the heat pump device and the energy storage device are confirmed by the following steps: S1: Obtain the steam demand on the application side; S2: configuring the equipment characteristic parameters of the energy storage module according to the steam demand, wherein the equipment characteristic parameters include the molten salt heat storage efficiency and the molten salt heat storage lower limit operating temperature; S3: adjusting the water inlet temperature of the water inlet end of the heat pump device according to the heat pump energy efficiency ratio, the molten salt heat storage efficiency and the molten salt heat storage lower limit operating temperature, so that a first temperature difference between the second temperature and the water inlet temperature is within a preset temperature difference range; S4: determining an upper limit value of the first temperature of the hot water heated by the heat pump device according to the lower limit operating temperature of the molten salt heat storage and the set second temperature difference, and confirming the operating power of the heat pump device in combination with the steam demand and the valley power duration.

2. The method for configuring demand for a heating system of an energy storage coupled heat pump according to claim 1, characterized in that: The second temperature difference is set according to the minimum value of the sum of the heat pump power consumption and the molten salt power consumption, wherein; The heat pump energy efficiency ratio and the second temperature difference have an approximate linear relationship of COP=κΔT2; The power consumption of the heat pump is: E1 = (Q2-Q1) / COP; The molten salt power consumption is: E2 = (Q3-Q2) / η = (λΔT2) / η; The second temperature difference is set to satisfy the minimum value of E1+E2, i.e., min((Q2-Q1) / κΔT2+λΔT2 / η)); Wherein: COP is the energy efficiency ratio of the heat pump, ΔT2 is the second temperature difference, Q1 is the heat brought by the heat exchange medium input at the water inlet, Q2 is the hot water heat output by the heat pump device, Q3 is the steam heat output by the energy storage module; η is the molten salt heat storage efficiency, κ and λ are both constants.

3. The method for configuring demand for a heating system of an energy storage coupled heat pump according to claim 1, characterized in that: The S4 further includes: Based on the upper limit value of the first temperature of the stored hot water heated by the heat pump device and the second temperature difference, the lower limit operating temperature of the molten salt heat storage is reversed; based on the lower limit operating temperature of the molten salt heat storage, a molten salt that matches the working requirements of the energy storage module is selected.

4. The method for configuring demand for a heating system of an energy storage coupled heat pump according to claim 1, characterized in that: Also includes any one of the following conditions: ① The water inlet temperature at the water inlet end is not higher than the upper limit value of the first temperature; ② The ratio of the first temperature difference to the first temperature is 1 to 2; ③ The preset temperature difference range of the first temperature difference is 90℃~290℃; ④The preset temperature difference range of the second temperature difference is 10℃~100℃; ⑤The setting range of the first temperature is 80℃~150℃, and the setting range of the second temperature is 100℃~300℃.

5. The method for configuring demand for a heating system of an energy storage coupled heat pump according to claim 1, characterized in that: The heating system further comprises a water storage device connected to the heat pump device and used for storing the stored hot water. The pressure adjustment range of the water storage device is 0.1 MPa to 0.5 MPa.

6. A heating system of energy storage coupled with a heat pump, characterized in that: A method for configuring demand for a heating system of an energy storage coupled heat pump according to any one of claims 1 to 5 comprises: A heat pump device, used for heating the heat exchange medium to the first temperature to obtain hot water storage; an energy storage device, connected to the heat pump device through a pipeline, and used for heating the stored hot water to water vapor having the second temperature; and A control unit, the control unit comprising: A first temperature monitoring module connected to the heat pump device, used to control the upper limit temperature of the first temperature to be within a set first threshold range; A second temperature monitoring module connected to the energy storage device, used to control the lower limit temperature of the third temperature of the molten salt to be within a set second threshold range; The first processing module connected to the first temperature monitoring module and the second temperature monitoring module is used to set the second temperature difference, and judge the stability of the operation of the heating system by comparing the second temperature difference with the calculated difference, and the calculated difference is the difference between the third temperature and the first temperature.

7. The heating system according to claim 6, characterized in that: The energy storage device comprises a plurality of the energy storage modules, and any two of the energy storage modules are connected in parallel or in series by switching between pipelines; In the parallel operation mode, any of the energy storage modules operates independently, and the lower limit temperature of the third temperature is set to 70° C. to 190° C.; In the series operation mode, at least two of the energy storage modules are connected in series, and the lower limit temperature setting value of the third temperature of the first energy storage module connected in the series structure is not lower than the melting point temperature of the molten salt.

8. The heating system according to claim 7, characterized in that: Also included is a second processing module, used for setting the first temperature difference: In the parallel operation mode, the first temperature difference is set in a range of 90° C. to 290° C.; or / and, In the series operation mode, the first temperature difference is set in a range of 120°C to 310°C.

9. The heating system according to claim 6, characterized in that: It also includes a water storage device, connected to the heat pump device, for storing the stored hot water at the first temperature, the water storage device includes a heat preservation water tank with a pressurizing function, and the heat preservation water tank includes: A pressure detection component is arranged inside the thermal insulation water tank and is used to monitor the pressure state inside the thermal insulation water tank in real time; The pressure regulating component is used to adjust the internal pressure of the thermal insulation water tank according to the pressure state to maintain the liquid storage state of the stored hot water.

10. A heating method of energy storage coupled heat pump, characterized in that: The method comprises operating and controlling the heating system according to any one of claims 6 to 9 or the device for setting the configuration method according to any one of claims 1 to 5, comprising the following steps: During the off-peak period, the heat exchange medium is heated to a first temperature slightly lower than the saturation temperature by using the heat pump device, and stored in the water storage device; During the heating period, the stored hot water at the first temperature is output from the water storage device and heated by the energy storage device to obtain water vapor at the second temperature.

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