Factory energy storage adjustment type electric energy heat pump heating system

Abstract

The application discloses a factory energy storage adjusting type electric energy heat pump heating system, which comprises a heat collecting subsystem, a heat storing subsystem and a heating subsystem, the heat collecting subsystem comprises a heat collecting water tank, a heat collecting facility and a heat collecting circulating pump; the heat storing subsystem comprises an energy storage water tank, an energy storage water pump and an energy storage heat exchanger, the heating subsystem comprises a water source heat pump and a heating circulating water pump, the energy storage heat exchanger is connected in parallel on the water supply pipeline of the heating circulating pipeline through a second heat exchange pipeline, and the energy storage heat exchanger is connected in parallel on the backwater pipeline of the heating circulating pipeline through a third heat exchange pipeline. The application recovers waste heat by the heat collecting subsystem, realizes heating by valley electricity, stores heat in the form of low-temperature hot water in the heat collecting water tank, has a low-temperature heat storage circulating pipeline between the heat collecting water tank and the energy storage water tank, can transmit and store low-temperature heat in the energy storage water tank, realizes low-temperature heat storage, the energy storage heat exchanger is connected in parallel on the heating circulating pipeline, realizes medium-temperature heat storage during a valley electricity period, and the energy storage water tank is used for heating water supply during a peak electricity period.

Description

TECHNICAL FIELD

[0001] The present application relates to a heat pump heating system, in particular to a factory energy storage adjustment type electric energy heat pump heating system. BACKGROUND

[0002] With the rapid growth of renewable energy power generation such as photovoltaic and wind power, the green electricity component of the power grid is increasing year by year, and the electrification of industrial energy has become an important starting point for the green and low-carbon development of factories. Developing efficient electric energy heat pump low-temperature heating (temperature 40~60℃, used for heating, air conditioning, process drying, and domestic hot water scenes), replacing fossil energy heat sources such as gas boiler rooms and municipal central heating, has gradually become a key point for factory technical improvement. Electric energy heat pump efficient heating requires three conditions of low-cost low-temperature heat source, improving heat pump efficiency, and reducing comprehensive electricity price. With the increase of peak-valley electricity price difference of the power grid, the increase of energy storage demand, and the combination of industrial low-temperature waste heat utilization, how to build a relatively general electric energy heat pump efficient heating system has become a technical problem to be solved. SUMMARY

[0003] Therefore, the present application provides a factory energy storage adjustment type electric energy heat pump heating system, which adopts waste heat + air source heat pump valley electricity heating type low-temperature heat source, electric energy water source heat pump + energy storage water tank type energy storage, builds a stable low-cost low-temperature heat source, valley electricity energy storage peak shaving, reduces comprehensive electricity price, and efficiently heats.

[0004] To achieve the above-mentioned purpose, the present application adopts the following technical scheme:

[0005] The factory energy storage adjustment type electric energy heat pump heating system provided by the present application comprises a heat collecting subsystem, a heat storing subsystem and a heat supplying subsystem.

[0006] The heat collecting subsystem comprises a heat collecting circulating pipeline formed by a heat collecting water tank, a heat collecting facility and a heat collecting circulating pump connected in sequence, and the heat collecting water tank is upper inlet and lower outlet during heat collection;

[0007] The heat storing subsystem comprises an energy storage water tank, an energy storage water pump and an energy storage heat exchanger, the energy storage water tank and the heat collecting water tank are connected by a pipeline to form a low-temperature heat storing circulating pipeline, a cooling circulating water pump is arranged on a water supply pipeline of the low-temperature heat storing circulating pipeline, and the energy storage water tank is upper inlet and lower outlet to form a vertical temperature difference of upper heat and lower cold during low-temperature heat storing; the energy storage water tank, the energy storage water pump and the energy storage heat exchanger are sequentially connected in head-tail mode to form a first heat exchanging pipeline;

[0008] The heat supplying subsystem comprises a water source heat pump and a heat supplying circulating pump, and the condenser of the water source heat pump, the heat supplying circulating pump and the user end are connected by a heat supplying circulating pipeline.

[0009] The energy storage heat exchanger is connected in parallel with the second heat exchange pipeline on the water supply pipeline of the heat supply circulation pipeline, and the energy storage heat exchanger is connected in parallel with the third heat exchange pipeline on the return water pipeline of the heat supply circulation pipeline.

[0010] The upper interfaces of the energy storage water tank and the heat collection water tank are connected with the circulating water inlet of the evaporator of the water source heat pump, and the circulating water outlet of the evaporator is divided into two paths, one path enters the heat collection water tank from the lower part of the heat collection water tank, and the other path enters the energy storage water tank from the lower part of the energy storage water tank.

[0011] In the above scheme, the heat collection subsystem recovers waste heat and heats in off-peak electricity, and stores heat in the form of low-temperature hot water in the heat collection water tank. The heat collection water tank and the energy storage water tank have a low-temperature heat storage circulation pipeline, which can transfer and store low-temperature heat in the energy storage water tank, realizing low-temperature heat storage. The energy storage heat exchanger is connected in parallel with the heat supply circulation pipeline, and heat exchange is carried out between the heat supply hot water and the water in the energy storage water tank during the off-peak electricity period, realizing medium-temperature heat storage. During the peak electricity period, the heat of the energy storage water tank is used to heat the water entering the second heat exchange pipeline, and the water flowing through the third heat exchange pipeline can also be heated, realizing medium-temperature heat release. When the water temperature in the energy storage water tank drops to 40 DEG C or below, it can also be used as a low-temperature heat source for the low-temperature side of the water source heat pump, realizing low-temperature heat release.

[0012] Compared with conventional electric energy heat pump heating, the scheme has the advantages of convenient combination of multiple heat sources on the heat source side, flexible adjustment, and strong adaptability. The heat medium side adopts step temperature difference heat transfer off-peak electricity energy storage, which can reduce peak load and cost. Compared with electric heating boiler off-peak electricity energy storage heating, the heat pump energy storage has high efficiency and low cost. Combined with industrial low-temperature waste heat utilization and peak-valley electricity price energy storage demand, it is constructed into an energy storage regulation type electric energy heat pump efficient heating system.

[0013] In actual construction, the heat taking facilities include factory waste heat, such as low-temperature waste heat of cooling circulating water and low-temperature waste heat of exhaust gas and drainage. For factories with insufficient waste heat, the heat taking facilities also include electric air source heat pumps, which can ensure that the water source heat pump provides a low-temperature heat source of 40 DEG C, meeting the operation demand under the condition that the waste heat is insufficient.

[0014] Preferably, the heat collection water tank is divided into an upper tank body and a lower tank body by a heat insulation plate, a first upper flow equalization pipe is horizontally arranged in the upper tank body, and the first upper flow equalization pipe is close to the top wall of the upper tank body; a first lower flow equalization pipe is horizontally arranged in the lower tank body, and the first lower flow equalization pipe is close to the bottom wall of the lower tank body.

[0015] A second upper flow equalization pipe and a second lower flow equalization pipe are horizontally arranged in the energy storage water tank, the second upper flow equalization pipe is close to the top wall of the energy storage water tank, and the second lower flow equalization pipe is close to the bottom wall of the energy storage water tank.

[0016] The beneficial effect is that the upper tank is filled with low-temperature hot water after heat exchange with the heat extraction facility, and the lower tank is filled with low-temperature water (temperature is 25 DEG C or below) for absorbing heat of the heat extraction facility; the uniform flow guide pipe effectively slows down the disturbance of the inlet water and outlet water, so that the heat collection tank and the energy storage tank form a vertical temperature difference of upper hot and lower cold, narrow the high and low temperature boundary of energy storage heat transfer, and improve the energy efficiency of the water source heat pump.

[0017] Preferably, the low-temperature hot water outlet of the heat collection circulating pipeline is provided with a spray head, and the spray head is located in the upper tank. In actual installation, the spray head is located above the first upper uniform flow guide pipe.

[0018] Preferably, the water supply end of the heat supply circulating pipeline is provided with a water mixer, the return water pipeline of the heat supply circulating pipeline is connected with the water mixer through an anti-overheating branch, and an anti-overheating valve is arranged on the anti-overheating branch. When the water temperature of the water supply delivered to the user end is too high, part of the return water and the water supply can be mixed to stabilize the water temperature.

[0019] In the preferred embodiment of the present application, the second heat exchange pipeline and the third heat exchange pipeline are respectively connected with the heat supply circulating pipeline through a reversing disc valve.

[0020] In the preferred embodiment of the present application, the water source heat pump is an electric energy water source heat pump; and the energy storage heat exchanger is a plate heat exchanger.

[0021] Compared with the prior art, the present application adopts waste heat + air source heat pump valley electricity heating, which can not only be used as a low-temperature heat source, but also can realize low-temperature heat storage; the heat medium side of the water source heat pump adopts a variable temperature operation energy storage mode, and in the peak electricity heating period, the energy storage tank can be used for heat release, so as to reduce the heating power consumption of the electric energy water source heat pump and reduce the comprehensive electricity price. The energy storage tank also improves the heat balance regulation capacity of the system. Compared with the existing gas boiler and municipal central heating, the heating cost of the present application can be reduced by more than 50%, the operation cost is low, and energy saving and carbon reduction are achieved. BRIEF DESCRIPTION OF DRAWINGS

[0022] Figure 1 It is a schematic diagram of the heat supply system pipeline of the present application. DETAILED DESCRIPTION

[0023] The embodiments of the present application will be described in detail below with reference to the drawings, and the embodiments are implemented on the premise of the technical scheme of the present application, and detailed implementation manners and specific operation processes are given, but the protection scope of the present application is not limited to the following embodiments.

[0024] In the description of the present application, unless otherwise explicitly specified and limited, the terms "connected", "connected" that may occur should be understood broadly, for example, it can be fixedly connected, or it can be detachably connected, or integrally connected; it can be mechanically connected, or it can be electrically connected; it can be directly connected, or it can be indirectly connected through an intermediate medium, or it can be the communication inside two elements. For those skilled in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances.

[0025] The present application provides a factory energy storage adjustment type electric energy heat pump heating system, comprising three subsystems of heat collection, energy storage and heating. Compared with conventional electric energy heat pump heating, the heat source side of the present application is convenient for the optimal combination of various low-temperature heat sources, has flexible adjustment and strong adaptability; the heat medium side adopts step temperature difference heat transfer valley electricity energy storage to reduce peak and cost. Compared with electric heating boiler valley electricity energy storage heating, the present application has high energy efficiency and low cost.

[0026] The factory energy storage adjustment type electric energy heat pump heating system provided by the present application comprises a heat collection subsystem, a heat storage subsystem and a heating subsystem. The heat collection subsystem can utilize factory low-temperature waste heat and electric energy air heat pump heat to provide low-temperature heat source for water source heat pump and can also be used for low-temperature heat storage; the water source heat pump heat medium side is based on variable temperature operation of inlet and outlet water, constant temperature operation of external heat supply, and intermediate temperature energy storage and intermediate temperature heat release by utilizing temperature difference gradient alternating heat exchange; the water source heat pump heat source side is based on parallel operation and heat release of the heat collection water tank and the energy storage water tank to improve the efficiency of the water source heat pump and reduce energy consumption.

[0027] Specifically, in combination with Figure 1 It can be known that the heating subsystem comprises a water source heat pump 1 (the water source heat pump 1 is an electric energy water source heat pump 1, which has an evaporator 1.1 and a condenser 1.2) and a heating circulation pump P1, and the condenser 1.2 of the water source heat pump 1, the heating circulation pump P1 and the user end are connected through a heating circulation pipeline 10.

[0028] In combination with Figure 1 It can be known that the heat collection subsystem comprises a heat collection water tank 2, a heat collection facility and a heat collection circulation pump P2, and the heat collection water tank 2, the heat collection facility and the heat collection circulation pump P2 are connected in sequence to form a heat collection circulation pipeline;

[0029] In actual installation, the heat collection water tank 2 is a square stainless steel heat preservation water tank, a heat insulation plate 2.1 with holes is arranged in the middle of the heat collection water tank 2, the heat insulation plate 2.1 divides the heat collection water tank 2 into two water tanks of upper heat and lower cold, forming a cooling supply and return water temperature difference; for convenience of distinction, the two water tanks are marked as an upper tank body 2.2 and a lower tank body 2.3, a first upper uniform flow guide pipe 2.4 is arranged horizontally in the upper tank body 2.2, and the first upper uniform flow guide pipe 2.4 is close to the top wall of the upper tank body 2.2; a first lower uniform flow guide pipe 2.5 is arranged horizontally in the lower tank body 2.3, and the first lower uniform flow guide pipe 2.5 is close to the bottom wall of the lower tank body 2.3, and the uniform flow guide pipes have the function of slowing down water disturbance.

[0030] In combination Figure 1 It can be seen that the heat extraction facility includes the low-temperature waste heat of the cooling circulating water and the low-temperature waste heat of the exhaust gas and drainage of the factory. The heat extraction facilities are connected in parallel, and each heat extraction facility corresponds to a heat collection circulating pump P2. When the waste heat is insufficient, the heat extraction facility further includes an electric air source heat pump (valley electricity heating) to ensure that the water source heat pump 1 is provided with a low-temperature heat source of 40 DEG C, and the operation demand under the condition that the waste heat is insufficient is met. Of course, for the working condition that the waste heat is sufficient, the electric air source heat pump can not be installed.

[0031] In work, the heat collection circulating pump P2 pumps the low-temperature water (≤25 DEG C) in the lower box body 2.3 to the heat extraction facility, absorbs the waste heat of the heat extraction facility (which can also be the heat supplied by the electric air source heat pump during the valley electricity period), and then is heated to 40 DEG C. The 40 DEG C low-temperature hot water after heating flows back to the upper box body 2.2, and the process is repeated, so that the water in the upper box body 2.2 is heated to 40 DEG C, and a low-temperature heat source is provided for the water source heat pump 1 and the energy storage subsystem described below.

[0032] In combination Figure 1 It can be seen that the outlet of each backwater branch of the heat collection circulating pipeline is located in the upper part of the inner cavity of the upper box body 2.2 and is provided with a spray head 2.6. That is, the present application adopts a spray form outlet to reduce water flow disturbance.

[0033] In combination Figure 1 It can be seen that the heat storage subsystem includes an energy storage water tank 3, an energy storage water pump P3 (preferably a centrifugal water pump), and an energy storage heat exchanger 4 (preferably a plate heat exchanger). The energy storage water tank 3 is a square stainless steel heat preservation water tank, and a second upper flow guide pipe 3.1 and a second lower flow guide pipe 3.2 are horizontally arranged in the energy storage water tank 3. The second upper flow guide pipe 3.1 is close to the top wall of the energy storage water tank 3, and the second lower flow guide pipe 3.2 is close to the bottom wall of the energy storage water tank 3. The upper and lower flow guide pipes reduce the disturbance of water in and out, and the upper hot and lower cold of the water tank form a vertical temperature difference, narrow the high and low temperature boundaries of energy storage heat transfer, and improve the energy efficiency of the water source heat pump 1.

[0034] The energy storage water tank 3 and the heat collection water tank 2 are connected by a pipeline to form a low-temperature heat storage circulating pipeline 5, and a cooling circulating water pump P4 is further arranged on the water supply pipeline of the low-temperature heat storage circulating pipeline 5. In the low-temperature heat storage, the cooling circulating water pump P4 pressurizes the 40 DEG C hot water in the upper box body 2.2 to be pumped to the heat collection water tank 2, and the low-temperature water (≤25 DEG C) in the lower part of the heat collection water tank 2 flows back to the lower box body 2.3 of the heat collection water tank 2. The process is repeated to heat the water in the energy storage water tank 3 to 40 DEG C, and the low-temperature heat storage is realized. In the low-temperature heat storage process, the heat collection water tank 2 is out of the upper and into the lower, and the energy storage water tank 3 is into the upper and out of the lower.

[0035] In actual installation, the upper interfaces of both the energy storage tank 3 and the hot water collection tank 2 are connected to the circulating water inlet of the evaporator 1.1. The circulating water outlet of the evaporator 1.1 is divided into two paths: one path enters the hot water collection tank 2 from the bottom, and the other path enters the energy storage tank 3 from the bottom. This allows both the hot water collection tank 2 and the energy storage tank 3 to exchange heat with the evaporator 1.1, thus meeting the low-temperature heat source requirements of the water source heat pump 1. During peak electricity hours, if the 40℃ low-temperature hot water in the energy storage tank 3 is available, it can be used preferentially for heat exchange with the evaporator 1.1. During off-peak electricity hours, the low-temperature hot water in the hot water collection tank 2 is used preferentially as a low-temperature heat source for heat exchange, and low-temperature heat storage is also possible. The specific choice can be flexibly made according to the heat consumption of the factory users.

[0036] In actual installation, in order to reduce the number of connecting pipes, the hot water collection tank 2 and the energy storage tank 3 are connected in parallel to provide a low-temperature heat source for the evaporator 1.1, and the water supply of the low-temperature heat release pipe of the hot water collection tank 2 is connected to the inlet side of the cooling circulating water pump P4.

[0037] Combination Figure 1 It can be seen that the energy storage tank 3, the energy storage pump P3, and the energy storage heat exchanger 4 are connected end to end to form the first heat exchange pipeline 6, and the first heat exchange pipeline 6 is equipped with a first directional valve 9.1; the energy storage heat exchanger 4 is connected in parallel to the water supply pipeline of the heating circulation pipeline 10 through the second heat exchange pipeline 7, and the energy storage heat exchanger 4 is connected in parallel to the water return pipeline of the heating circulation pipeline 10 through the third heat exchange pipeline 8; the on / off positions of the second heat exchange pipeline 7 and the energy storage heat exchanger 4, as well as the on / off positions of the third heat exchange pipeline 8 and the energy storage heat exchanger 4, are switched by the second directional valve 9.2. When the second heat exchange pipeline 7 and the energy storage heat exchanger 4 are connected, medium-temperature heat storage during off-peak hours and medium-temperature heat release during peak hours can be realized; when the third heat exchange pipeline 8 is connected to the energy storage heat exchanger 4, the return water in the heating circulation pipeline 10 can be heated.

[0038] Combination Figure 1 It is known that a mixing valve 11 is installed at the water supply end of the heating circulation pipeline 10, and the return water pipeline of the heating circulation pipeline 10 is connected to the mixing valve 11 through an overheat protection branch, and an overheat protection valve 12 is installed on the overheat protection branch. When the water supply temperature at the user end is too high, part of the return water and the supply water are mixed to ensure the water supply temperature.

[0039] During actual installation, water level sensors are installed in both the hot water collection tank 2 and the energy storage tank 3 to achieve return water flow control; electric butterfly valves are installed on the water supply and return water pipelines of the heat collection circulation pipeline, the heating circulation pipeline 10, the second heat exchange pipeline 7, the third heat exchange pipeline 8 and the low temperature heat storage circulation pipeline 5.

[0040] The application can not only realize low-temperature heat storage (i.e. the energy of the energy storage water tank 3 is replaced by the upper tank 2.2, and the low-temperature water in the energy storage water tank 3 is heated to 40 DEG C), but also realize 40-70 DEG C medium-temperature heat storage, 70-40 DEG C medium-temperature heat release and 40-20 DEG C low-temperature heat release. Assuming that the water temperature in the upper tank 2.2 is 40 DEG C, the water temperature in the lower tank 2.3 is 25 DEG C, the user end water temperature is 60 DEG C, and the user end return water temperature is 40 DEG C, the heat collection, low-temperature heat storage, low-temperature heat release, medium-temperature heat storage and medium-temperature heat release processes of the application are described in detail.

[0041] During heat collection, the low-temperature water (assuming 25 DEG C) in the lower tank 2.3 is pressurized and extracted by the heat collection circulating pump P2, and is heat-exchanged with the heat collection facility to absorb the waste heat of the heat collection facility. The heat-exchanged water is sprayed on the upper part of the upper tank 2.2 through the spray head 2.6, and the process is repeated to realize the recycling of waste heat (electricity can be supplemented by an electric air source heat pump during the valley period), so that the water in the upper tank 2.2 is heated to 40 DEG C, and temperature stability is realized.

[0042] The low-temperature heat storage of the application is direct heat exchange between the heat collection water tank 2 and the energy storage water tank 3. Specifically, the 40 DEG C water in the upper tank 2.2 is pressurized by the cooling circulating water pump P4 and then divided into two flows into the second upper uniform flow guide pipe 3.1 in the energy storage water tank 3. The 20 DEG C low-temperature water in the energy storage water tank 3 returns to the lower tank 2.3 through the second lower uniform flow guide pipe 2.5 in the lower part, and the process is repeated for a certain period of time, so that the 20 DEG C water in the energy storage water tank 3 is gradually heated to 40 DEG C, and the low-temperature heat storage is completed. During the low-temperature heat storage process, the water source heat pump 1 only bears the normal external heat supply load, the heat collection water tank 2 releases heat at high load, the low-temperature heat storage is not limited to the valley period, and the waste heat collection amount is greater than the low-temperature heat source heat consumption amount, so that the working conditions can be operated.

[0043] The medium-temperature heat storage of the application is selected to be operated during the valley period, and the valley electricity is used to increase the heat and reduce the comprehensive operation electricity price of the water source heat pump 1. Specifically, the water source heat pump 1 is operated in variable temperature mode, and the water supply temperature is gradually increased from 60 DEG C to 70 DEG C. Part of the flow or the whole flow of the water supply flows through the second heat exchange pipeline 7 and flows through the energy storage heat exchanger 4. The energy storage water pump P3 in the first heat exchange pipeline 6 pressurizes the water in the energy storage water tank 3, and the pressurized water is extracted and heat-exchanged with the water supply, and then enters the second upper uniform flow guide pipe 3.1. The process is repeated for a certain period of time, so that the water in the energy storage water tank 3 is gradually heated from 40 DEG C to 70 DEG C, i.e. the medium-temperature heat storage + external heat supply is completed by using the high load operation of the water source heat pump 1. In addition, during the medium-temperature heat storage process, the 40 DEG C hot water in the heat collection water tank is pressurized by the cooling circulating water pump P4 and then enters the evaporator 1.1. After heat exchange, the water returns to the first lower uniform flow guide pipe 2.5 in the lower tank 2.3, i.e. the heat collection water tank 2 releases heat at high load and low temperature, and provides a low-temperature heat source for the water source heat pump 1.

[0044] The medium-temperature heat release of the application includes two processes of heating the water supply and heating the return water.

[0045] Heating water supply: water source heat pump 1 water temperature operation (from 50 DEG C gradually increased to 60 DEG C), water supply through the second heat exchange pipeline 7 full flow through the energy storage heat exchanger 4, 70 DEG C water in the energy storage water tank 3 through the energy storage heat transfer to the water supply, water absorption heat to 60 DEG C to supply the user end; The water temperature in the energy storage water tank 3 gradually decreases from 70 DEG C to 60 DEG C; Heating return water: return water after heat exchange through the user end through the third heat exchange pipeline 8 full flow through the energy storage heat exchanger 4 heat absorption, so that the return water into the water source heat pump 1 is heated, and the energy storage water tank 3 is gradually reduced from 60 DEG C to 40 DEG C.

[0046] The medium-temperature heat release of the application first heats the water supply with the heat of the energy storage water tank 3, and then releases heat to the return water of the heating subsystem, which can be operated during peak electricity period. The water source heat pump 1 is operated at variable working conditions and low load, reducing the peak electricity consumption of the water source heat pump 1 and lowering the comprehensive electricity price. In addition, during the medium-temperature heat release process, the 40 DEG C in the heat collection source is pressurized by the cooling circulating water pump P4 and enters the evaporator 1.1, and after heat exchange, it returns to the first lower uniform flow guide pipe 2.5 in the lower box 2.3, that is, the heat collection water tank 2 releases heat at low load and low temperature, providing a low-temperature heat source for the water source heat pump 1.

[0047] The low-temperature heat release of the application is achieved by parallel operation of the 40 DEG C in the energy storage water tank 3 and the heat collection water tank 2, which provides a low-temperature heat source for the water source heat pump 1. Specifically, the 40 DEG C hot water in the energy storage water tank 3 and the heat collection water tank 2 is pressurized by the cooling circulating water pump P4 and delivered to the evaporator 1.1 of the water source heat pump 1, and after heat release and temperature reduction to 25 DEG C, it returns to the second lower uniform flow guide pipe 3.2 of the energy storage water tank 3 and the first lower uniform flow guide pipe 2.5 of the lower box 2.3, respectively. When the water temperature in the energy storage water tank 3 decreases to 25 DEG C, the low-temperature heat release period can be appropriately extended to reduce the water temperature in the energy storage water tank 3 to 20 DEG C, so as to improve the energy storage capacity and adjust the system heat balance.

[0048] The low-temperature heat storage and low-temperature heat release of the application can balance the imbalance between low-temperature heat source and heat use, avoid or reduce air source heat pump heating during non-valley electricity period, and reduce low-temperature heat source cost. The medium-temperature heat storage and medium-temperature heat release mainly reduce peak shaving and cost during valley electricity period, and reduce the comprehensive electricity price of the water source heat pump 1. The energy storage and temperature regulation functions of the heat collection water tank 2 and the energy storage water tank 3 improve the stability of the low-temperature heat source and the efficiency of the heat pump, achieving efficient heating of electric energy heat pump from three aspects of constructing low-cost low-temperature heat source, improving heat pump efficiency and reducing comprehensive electricity price.

[0049] The energy saving estimation process of the application is as follows: assuming that the investment and operation and maintenance costs are not considered, the direct cost of low-temperature waste heat is approximately zero, and the main cost is the electricity cost of the heat pump; according to the estimation of 50% air source heat pump valley electricity heating, low-temperature heating (ambient air temperature 0 DEG C, heat pump water supply temperature 40 DEG C), average COP 2.5, valley electricity price 0.25 yuan / kWh, the direct cost of low-temperature heat source is 14 yuan / GJ.

[0050] According to the average COP of 5 of the water source heat pump 14.5, the comprehensive electricity price of 0.5 yuan / kWh, and the comprehensive electricity additional coefficient of 1.2, the direct cost of the water source heat pump 14.5 for heating is estimated to be 34 yuan / GJ; the total direct cost of heating is 48 yuan / GJ (equivalent to 120 yuan / t of steam);

[0051] The gas boiler and the municipal central heating are both calculated at an average heat price of 100 yuan / GJ (equivalent to 250 yuan / t of steam), and the direct cost of heating is reduced by more than 50%, thereby reducing the operation cost and saving energy and reducing emissions.

[0052] Finally, it should be emphasized that the above only describes the preferred embodiments of the present application and is not intended to limit the present application. Although the present application has been described in detail with reference to the foregoing embodiments, those skilled in the art can still make modifications to the technical solutions described in the foregoing embodiments without creative labor, or make equivalent replacements to some technical features. Thus, any modification, equivalent replacement, improvement, etc. made within the spirit and principles of the present application shall be included in the protection scope of the present application.

Claims

1. A factory energy storage and regulation type electric heat pump heating system, characterized in that: It includes a heat collection subsystem, a heat storage subsystem, and a heating supply subsystem. The heat collection subsystem includes a heat collection circulation pipeline consisting of a heat collection tank, heat extraction facilities, and a heat collection circulation pump connected in sequence. During heat collection, the heat collection tank is positioned with the inlet at the top and the outlet at the bottom. The thermal storage subsystem includes an energy storage water tank, an energy storage water pump, and an energy storage heat exchanger. The energy storage water tank and the hot water collection tank are connected by pipelines to form a low-temperature thermal storage circulation pipeline. A cooling circulating water pump is installed on the water supply pipeline of the low-temperature thermal storage circulation pipeline. During low-temperature thermal storage, the energy storage water tank is positioned with the water inlet at the top and the outlet at the bottom, forming a vertical temperature difference with the water hot at the top and the water cold at the bottom. The energy storage water tank, the energy storage water pump, and the energy storage heat exchanger are connected end to end to form the first heat exchange pipeline. The heating subsystem includes a water source heat pump and a heating circulating water pump. The condenser of the water source heat pump, the heating circulating water pump and the user end are connected through a heating circulation pipeline. Among them, the energy storage heat exchanger is connected in parallel to the water supply pipeline of the heating circulation pipeline through the second heat exchange pipeline, and the energy storage heat exchanger is connected in parallel to the water return pipeline of the heating circulation pipeline through the third heat exchange pipeline. The upper interfaces of both the energy storage tank and the hot water collection tank are connected to the circulating water inlet of the evaporator of the water source heat pump. The circulating water outlet of the evaporator is divided into two paths: one path enters the hot water collection tank from the bottom, and the other path enters the energy storage tank from the bottom.

2. The factory energy storage regulating electric heat pump heating system according to claim 1, characterized in that: The heat exchange tank is divided into an upper tank and a lower tank by a heat insulation plate. A first upper flow equalization conduit is horizontally arranged inside the upper tank and is close to the top wall of the upper tank. A first lower flow equalization conduit is horizontally arranged inside the lower tank and is close to the bottom wall of the lower tank. The energy storage tank is equipped with a second upper flow equalization pipe and a second lower flow equalization pipe, which are horizontally arranged inside the tank. The second upper flow equalization pipe is close to the top wall of the energy storage tank, and the second lower flow equalization pipe is close to the bottom wall of the energy storage tank.

3. The factory energy storage regulating electric heat pump heating system according to claim 2, characterized in that: The low-temperature hot water outlet of the heat exchange circulation pipeline is equipped with a spray head, which is located inside the upper tank.

4. The factory energy storage regulating electric heat pump heating system according to claim 2, characterized in that: The supply end of the heating circulation pipeline is equipped with a mixing valve, and the return water pipeline of the heating circulation pipeline is connected to the mixing valve through an overheat protection branch, and an overheat protection valve is installed on the overheat protection branch.

5. The factory energy storage regulating electric heat pump heating system according to claim 1, characterized in that: The second and third heat exchange pipelines are respectively connected to the heating circulation pipeline via steering disc valves.

6. The factory energy storage regulating electric heat pump heating system according to claim 1, characterized in that: The water source heat pump is an electric water source heat pump; the energy storage heat exchanger is a plate heat exchanger.

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