Electrically driven regenerative open heat pump unit and heating system thereof

Abstract

This invention provides an electrically driven open-type heat pump unit and its heating system, comprising an absorption tower, a low-temperature solution storage tank, an evaporator, a heat exchanger, a compressor, an expansion valve, a high-temperature solution storage tank, a condenser, a steam compressor, and a condenser. A dilute solution sequentially enters the high-temperature solution storage tank and the condenser, then enters the condenser for concentration. The concentrated high-temperature solution then enters the high-temperature solution storage tank, the heat exchanger, the low-temperature solution storage tank, and the absorption tower. The heat exchanger provides external heating. The steam generated during concentration enters the steam compressor, where it is pressurized and heated, serving as a heat source for the solution concentration process. Part of the solution in the low-temperature solution storage tank enters the evaporator for heat release and cooling. The refrigerant vapor generated in the evaporator is pressurized by the compressor and enters the condenser to heat the dilute solution. After condensation, the refrigerant vapor returns to the evaporator through the expansion valve, completing the refrigerant cycle. This invention is entirely electrically driven, increasing the external heating temperature and better meeting the heating needs of users. Furthermore, it decouples waste heat recovery, heat supply, and power consumption, making the system more flexible and efficient, and significantly reducing operating costs.

Description

Technical Field

[0001] This invention belongs to the field of energy utilization, and specifically relates to an electrically driven open-type heat pump unit with thermal storage and its heating system. Background Technology

[0002] Under the dual carbon targets, reducing production energy consumption has become a common goal across various industries. Open-loop heat pumps have unique advantages in recovering waste heat from flue gas and have received increasing attention and application.

[0003] Chinese patent application CN112378116A discloses an open-loop heat pump device driven by high-temperature flue gas and its application. It uses high-temperature flue gas as a heat source to drive an open-loop heat pump to recover waste heat from low-temperature flue gas for heating. The return water from the heat user flows sequentially through a first heat exchanger and a second heat exchanger to be heated. However, this open-loop heat pump device cannot operate without high-temperature flue gas. Furthermore, because solutions have lower surface water vapor pressure at the same temperature compared to pure water, the steam generated during the solution concentration process condenses to heat the hot water, resulting in a lower outlet water temperature. Moreover, the device couples the recovery of waste heat with the heat load demand; when these two are mismatched, the device's operating performance is affected.

[0004] Chinese patent application CN115400553A discloses an electrically driven open-loop absorption heat pump system. This system utilizes a steam compressor to pressurize and heat the steam generated during solution concentration, using it as the heat source for the concentration process. Simultaneously, a storage tank is added to the system to store the concentrated solution for energy storage. This allows the system to utilize more low-cost electricity during off-peak hours and consume less electricity during peak hours, reducing operating costs. While the system operates normally without the need for an external heat source, driven by electricity, it aligns with the electrification trend driven by the rapid development of new energy power. However, the system relies solely on a cold source heater for external heating, resulting in a relatively low external heating temperature. Furthermore, its waste heat recovery and heat load requirements are coupled; mismatch between these factors affects system operation. Additionally, during system startup, the steam compressor cannot operate due to the lack of steam generation, requiring an external heat source to heat the solution. Only after the solution is concentrated and steam is generated can the electrically driven steam compressor operate normally.

[0005] It is evident that existing open-loop heat pump systems generally suffer from problems such as low heating temperatures, coupling of waste heat recovery and user load, and the need for an external heat source during startup. Therefore, it is of great significance to propose an open-loop heat pump unit that is fully electrically driven, decouples waste heat recovery from user load, achieves higher external heating temperatures, and makes full use of off-peak electricity. Summary of the Invention

[0006] (I) Purpose of the Invention

[0007] The purpose of this invention is to provide an electrically driven open-type heat pump unit and its heating system, which is entirely powered by electricity to recover waste heat from flue gas and provide external heating. This invention achieves decoupling between waste heat recovery, external heating capacity, and power consumption by setting up low-temperature solution storage tanks and high-temperature solution storage tanks, making full use of inexpensive electricity. Simultaneously, through internal process optimization, it completely eliminates external heat source consumption while increasing the external heating temperature of the heat pump unit, enabling the heat pump unit to meet the needs of heat users and operate continuously and efficiently.

[0008] (II) Technical Solution

[0009] To address the aforementioned problems, the first aspect of this invention provides an electrically driven open-type heat pump unit with thermal storage and its heating system, comprising:

[0010] Absorption tower, low-temperature solution storage tank, evaporator, heat exchanger for heating network, compressor, expansion valve, high-temperature solution storage tank, condenser, steam compressor, condenser.

[0011] The flue gas to be treated enters the absorption tower, where it undergoes heat and mass transfer with the solution before flowing out.

[0012] The dilute solution flowing out of the absorption tower enters the high-temperature solution storage tank, then enters the condenser for preheating, and then enters the concentrating condenser. In the concentrating condenser, the dilute solution is heated and concentrated. The water vapor generated during the concentration process enters the steam compressor, where it is pressurized and heated to serve as a heat source for the solution concentration process. It is then condensed in the concentrating condenser. The heated and concentrated high-temperature solution enters the high-temperature solution storage tank, and then enters the heat exchanger of the heat network to heat the return water of the heat users. The concentrated solution, after releasing heat and cooling down, enters the low-temperature solution storage tank, and then enters the absorption tower to transfer heat and mass with the flue gas.

[0013] Part of the solution in the cryogenic solution storage tank enters the evaporator, where it releases heat and cools down. The cooled cryogenic solution is then returned to the cryogenic solution storage tank.

[0014] The refrigerant vapor that absorbs heat and evaporates in the evaporator enters the compressor. After being pressurized by the compressor, it enters the condenser as a heat source to heat the dilute solution. The refrigerant that releases heat and condenses in the condenser enters the expansion valve for throttling and pressure reduction, and then returns to the evaporator to complete the refrigerant cycle.

[0015] The return water from heat users enters the heating network heater, is heated, and then flows out as supply water to heat users.

[0016] Furthermore, a portion of the dilute solution flowing out of the absorption tower is returned to the absorption tower solution inlet, where it mixes with the concentrated solution flowing out of the low-temperature solution storage tank before entering the absorption tower to transfer heat and mass with the flue gas.

[0017] Furthermore, it also includes a gas-liquid separator. The water vapor generated in the condenser enters the gas-liquid separator for gas-liquid separation. The separated gas enters the steam compressor for pressurization and heating, while the separated solution returns to the condenser.

[0018] Furthermore, some of the waste generated in the absorption tower is discharged through the drain outlet. The discharge reduces the amount of circulating solution in the system, which is replenished through the replenishment port set in the concentrated solution storage tank to maintain a stable amount of circulating solution in the system.

[0019] In another aspect, the present invention provides a heating system for an electrically driven open-type heat pump unit, utilizing any of the electrically driven open-type heat pump units provided in the first aspect of the present invention for the recovery and utilization of waste heat from flue gas. The flue gas to be treated can be boiler flue gas, power plant flue gas, or industrial flue gas; the heat user can be a heating user or a material requiring heating generated during the production process.

[0020] (III) Beneficial Effects

[0021] The above-described technical solution of the present invention has the following beneficial technical effects:

[0022] This invention utilizes a compressor and a steam compressor to achieve fully electric drive without external heat source startup, expanding the application scenarios of open heat pumps. It also increases the external heating temperature, better meeting the heating needs of users. In addition, by using low-temperature solution storage tanks and high-temperature solution storage tanks, it achieves decoupling between waste heat recovery, heat supply, and power consumption, making the system operation more flexible and efficient, and greatly reducing the system's operating costs. Attached Figure Description

[0023] Figure 1 This is a schematic diagram of the device structure of Embodiment 1 of the present invention;

[0024] Figure 2 This is a schematic diagram of the device structure in Embodiment 2 of the present invention;

[0025] Figure 3 This is a schematic diagram of the device structure in Embodiment 3 of the present invention;

[0026] Figure 4 This is a schematic diagram of the device structure of Embodiment 4 of the present invention;

[0027] Figure label:

[0028] 1: Absorption tower; 101: Flue gas inlet; 102: Flue gas outlet; 103: Solution inlet; 104: Solution outlet; 105: Sewage outlet; 2: Cryogenic solution storage tank; 201: Cryogenic solution return port; 202: Cryogenic solution outlet; 203: Solution inlet; 204: Solution outlet; 3: Evaporator; 301: Solution inlet; 302: Solution outlet; 303: Refrigerant inlet; 304: Refrigerant outlet; 4: Heat exchanger; 401: Water inlet; 402: Water outlet; 403: Solution inlet; 404: Solution outlet; 5: Compressor; 501: Refrigerant inlet; 502: Refrigerant outlet; 6: Expansion valve; 601: Refrigerant outlet; 602: Refrigerant inlet; 7: High-temperature solution storage tank; 701: Low-temperature solution inlet; 702: High-temperature solution outlet; 703: High-temperature solution inlet; 704: Low-temperature solution outlet; 705: Liquid replenishment port; 8: Concentrator condenser; 801: Solution inlet; 802: Solution outlet; 803: Heat source inlet; 804: Heat source outlet; 805: Steam outlet; 806: Liquid return port; 9: Steam compressor; 901: Steam inlet; 902: Steam outlet; 10: Condenser; 1001: Refrigerant outlet; 1002: Refrigerant inlet; 1003: Solution inlet; 1004: Solution outlet; 11: Gas-liquid separator; 1101: Inlet; 1102: Gas outlet; 1103: Solution outlet. Detailed Implementation

[0029] To make the objectives, technical solutions, and advantages of this invention clearer, the invention will be further described in detail below with reference to specific embodiments and the accompanying drawings. It should be understood that these descriptions are merely exemplary and not intended to limit the scope of the invention. Furthermore, descriptions of well-known structures and techniques are omitted in the following description to avoid unnecessarily obscuring the concept of the invention.

[0030] The terms "comprising" and "having," and any variations thereof, used in the specification, claims, and accompanying drawings of this invention, are intended to cover non-exclusive inclusion. For example, a process, method, system, product, or apparatus that comprises a series of steps or units is not limited to the steps or units listed, but may optionally include steps or units not listed, or may optionally include other steps or units inherent to such processes, methods, products, or apparatus.

[0031] In this document, the term "embodiment" means that a particular feature, structure, or characteristic described in connection with an embodiment may be included in at least one embodiment of the invention. The appearance of this phrase in various places throughout the specification does not necessarily refer to the same embodiment, nor is it a separate or alternative embodiment mutually exclusive with other embodiments. It will be explicitly and implicitly understood by those skilled in the art that the embodiments described herein can be combined with other embodiments.

[0032] Obviously, the described embodiments are only some, not all, of the embodiments of the present invention. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without inventive effort are within the scope of protection of the present invention. Furthermore, the technical features involved in the different embodiments of the present invention described below can be combined with each other as long as they do not conflict with each other. The present invention will now be described in more detail with reference to the accompanying drawings. In the various drawings, the same elements are represented by similar reference numerals. For clarity, the various parts in the drawings are not drawn to scale.

[0033] Specifically, as described in the following specific embodiments:

[0034] Example 1:

[0035] Figure 1 This is a schematic diagram of the device structure according to Embodiment 1 of the present invention.

[0036] like Figure 1 As shown, in this invention, an electrically driven open-type heat pump unit with thermal storage and its heating system include:

[0037] Absorption tower 1, low temperature solution storage tank 2, evaporator 3, heat exchanger 4, compressor 5, expansion valve 6, high temperature solution storage tank 7, condenser 8, steam compressor 9, condenser 10.

[0038] Absorption tower 1 has a flue gas inlet 101, a flue gas outlet 102, a solution inlet 103, and a solution outlet 104.

[0039] The cryogenic solution storage tank 2 has a cryogenic solution return port 201, a cryogenic solution outlet 202, a solution inlet 203, and a solution outlet 204.

[0040] The high-temperature solution storage tank 7 has a low-temperature solution inlet 701, a high-temperature solution outlet 702, a high-temperature solution inlet 703, and a low-temperature solution outlet 704.

[0041] The condenser 8 includes a solution inlet 801, a solution outlet 802, a heat source inlet 803, a heat source outlet 804, and a steam outlet 805.

[0042] The solution outlet 104 of the absorption tower is connected to the low-temperature solution inlet 701 of the high-temperature solution storage tank 7. The low-temperature solution outlet 704 of the high-temperature solution storage tank 7 is connected to the solution inlet 1003 of the condenser 10. The solution outlet 1004 of the condenser 10 is connected to the solution inlet 801 of the concentrator condenser 8. The solution outlet 802 of the concentrator condenser 8 is connected to the high-temperature solution inlet 703 of the high-temperature solution storage tank 7. The high-temperature solution outlet 702 of the high-temperature solution storage tank 7 is connected to the solution inlet 403 of the heat exchanger 4. The solution outlet 404 of the heat exchanger 4 is connected to the solution inlet 203 of the low-temperature solution storage tank 2. The solution outlet 204 of the low-temperature solution storage tank 2 is connected to the solution inlet 103 of the absorption tower 1.

[0043] The cryogenic solution outlet 202 of the cryogenic solution storage tank 2 is connected to the solution inlet 301 of the evaporator 3, and the solution outlet 302 of the evaporator 3 is connected to the cryogenic solution return port 201 of the cryogenic solution storage tank 2.

[0044] The refrigerant outlet 304 of the evaporator 3 is connected to the refrigerant inlet 501 of the compressor 5, the refrigerant outlet 502 of the compressor 5 is connected to the refrigerant inlet 1002 of the condenser 10, the refrigerant outlet 1001 of the condenser 10 is connected to the refrigerant inlet 602 of the expansion valve 6, and the refrigerant outlet 601 of the expansion valve 6 is connected to the refrigerant inlet 303 of the evaporator 3.

[0045] The steam outlet 805 of the condenser 8 is connected to the steam inlet 901 of the steam compressor 9, and the steam outlet 902 of the steam compressor 9 is connected to the heat source inlet 803 of the condenser 8, serving as a heating source during the concentration process.

[0046] The return water for heat users is connected to the inlet 401 of the heat exchanger 4, and the outlet 402 of the heat exchanger 4 is connected to the supply water for heat users.

[0047] The flue gas to be treated is connected to the flue gas inlet 101 of the absorption tower 1.

[0048] In this embodiment, the system is fully electrically driven by a compressor and a steam compressor, eliminating the need for an external heat source even in the initial operation phase. This expands the application scenarios of open-loop heat pumps and increases the external heating temperature, better meeting the heating needs of users. Furthermore, the use of low-temperature and high-temperature solution storage tanks decouples the recovery of waste heat, the supply of heat, and the power consumption, making the system more flexible and efficient and significantly reducing operating costs.

[0049] The specific operation method of this embodiment is as follows:

[0050] During initial system startup, compressor 5 operates. The solution flowing from the cryogenic solution outlet 202 of cryogenic solution storage tank 2 cools and releases heat in evaporator 3, while the refrigerant absorbs heat and evaporates in evaporator 3. After being pressurized by compressor 5, the solution enters condenser 10 for condensation and cooling, heating the solution. The heated solution then enters condenser 8, where it evaporates to produce water vapor. This water vapor enters steam compressor 9, which then starts, pressurizing and heating the steam. The pressurized and heated steam returns to condenser 8 as a heat source for the concentrated solution. Once steam compressor 9 is operational, it provides continuous driving energy for the system, enabling waste heat recovery and external heating.

[0051] During peak electricity hours when prices are high, compressors 5 and 9 stop operating. The high-temperature concentrated solution stored in high-temperature solution storage tank 7 flows out and enters the heat exchanger 4 to heat the return water for heat users, providing heat load to the outside world. The cooled concentrated solution enters low-temperature solution storage tank 2, and the low-temperature concentrated solution flows out from low-temperature solution storage tank 2 and enters the absorption tower 1 to transfer heat and mass with the flue gas. The diluted solution returns to high-temperature solution storage tank 7, completing the solution cycle. At this time, the high-temperature concentrated solution in high-temperature solution storage tank 7 decreases, the dilute solution increases, and the solution temperature in low-temperature solution storage tank 2 rises.

[0052] During off-peak electricity hours when electricity prices are low, compressors 5 and 9 start operating. The dilute solution stored in high-temperature solution tank 7 flows out, is heated by condenser 10, and then enters concentrator 8 for further heating and concentration. The concentrated solution then returns to high-temperature solution tank 7, where a portion is stored and the remainder flows out to the heating network heater 4 to heat the return water for external heating. The cooled concentrated solution then enters low-temperature solution tank 2. The low-temperature concentrated solution flows out of low-temperature solution tank 2 and enters absorption tower 1 to undergo heat and mass transfer with the flue gas, before returning to high-temperature solution tank 7. Additionally, a portion of the solution in low-temperature solution tank 2 flows out and enters evaporator 3 to release heat and cool down, before returning to the low-temperature solution tank. At this time, the dilute solution in high-temperature solution tank 7 decreases, the high-temperature concentrated solution increases, and the solution temperature in low-temperature solution tank 2 decreases.

[0053] During periods of high heat load and low waste heat, the flow rate of the high-temperature concentrated solution entering the heat exchanger 4 from the high-temperature solution storage tank 7 increases, resulting in increased external heat supply to meet the higher heat load demand. The cooled concentrated solution then enters the low-temperature solution storage tank 2, where a portion is stored, while the other portion enters the absorption tower 1 to transfer heat and mass with the flue gas, recovering waste heat, and then returns to the high-temperature solution storage tank 7. At this time, the solution volume in the high-temperature solution storage tank 7 decreases, while the solution volume in the low-temperature solution storage tank 2 increases.

[0054] During periods of low heat load but high waste heat, the flow rate of the high-temperature concentrated solution entering the heat exchanger 4 from the high-temperature solution storage tank 7 decreases, reducing the external heat supply to meet the lower heat load demand. The cooled concentrated solution then enters the low-temperature solution storage tank 2. The concentrated solution flowing out of the low-temperature solution storage tank 2 enters the absorption tower 1 to transfer heat and mass with the flue gas, recovering waste heat from the flue gas, and then returns to the high-temperature solution storage tank 7. At this time, the flow rate of the solution flowing out of the low-temperature solution storage tank 2 is greater than the flow rate flowing in, to meet the greater waste heat recovery requirements. Therefore, the solution storage volume in the high-temperature solution storage tank 7 increases, while the solution storage volume in the low-temperature solution storage tank 2 decreases.

[0055] Example 2:

[0056] Figure 2 This is a schematic diagram of the device structure in Embodiment 2 of the present invention.

[0057] The difference from Embodiment 1 is that, in this embodiment, the solution outlet 104 of the absorption tower 1 is connected to the solution inlet 103 of the absorption tower 1. A portion of the dilute solution flowing out of the absorption tower 1 returns to the solution inlet 103 of the absorption tower 1, mixes with the concentrated solution from the low-temperature solution storage tank 2, and then enters the absorption tower 1 to undergo heat and mass transfer with the flue gas.

[0058] Compared with Example 1, this example can reduce the required concentration of the solution flow rate, increase the venting range of the solution circulation, and reduce the pump consumption of the system.

[0059] Example 3:

[0060] Figure 3 This is a schematic diagram of the device structure according to Embodiment 3 of the present invention.

[0061] The difference from Embodiment 2 is that this embodiment also includes a gas-liquid separator 11.

[0062] The gas-liquid separator includes an inlet 1101, a gas outlet 1102, and a solution outlet 1103.

[0063] The condenser 8 also has a return port 806.

[0064] The inlet 1101 of the gas-liquid separator 11 is connected to the steam outlet 805 of the condenser 8, the gas outlet 1102 of the gas-liquid separator 11 is connected to the steam inlet 901 of the steam compressor 9, and the solution outlet 1103 of the gas-liquid separator 11 is connected to the return port 806 of the condenser 8.

[0065] Compared with Example 2, this example adds a gas-liquid separator 11 to separate the gas entering the steam compressor 9, thereby ensuring the safe operation of the steam compressor 9 and improving the reliability of the system operation.

[0066] Example 4:

[0067] Figure 4 This is a schematic diagram of the device structure according to Embodiment 4 of the present invention.

[0068] The difference from Example 3 is that in this example, the absorption tower 1 also has a drain outlet 105, and the high-temperature solution storage tank 7 also has a replenishment outlet 705.

[0069] Some of the waste generated in the absorption tower 1 is discharged through the drain outlet 105. The discharge reduces the circulating solution volume of the system. The waste is replenished through the replenishment outlet 705 of the concentrated solution storage tank 7 to maintain a stable circulating solution volume in the system.

[0070] Compared with Example 3, this example adds a drain outlet 105 and a liquid replenishment outlet 705, which can promptly discharge solid waste such as dust washed off from the flue gas, avoiding blockage of pipes and heat exchangers. At the same time, the liquid replenishment outlet 705 can promptly replenish the solution, keeping the solution circulation volume constant, thus ensuring the safe operation and stable performance of the system.

[0071] In the above embodiments, the flue gas to be treated can be boiler flue gas, power plant flue gas, industrial flue gas, etc.; the heat user can be a heating user, or a material that needs to be heated during the process of production, etc.

[0072] The present invention has been described above with reference to embodiments thereof. However, these embodiments are merely illustrative and not intended to limit the scope of the invention. The scope of the invention is defined by the appended claims and their equivalents. Various substitutions and modifications can be made by those skilled in the art without departing from the scope of the invention, and all such substitutions and modifications should fall within the scope of the invention.

Claims

1. An electrically driven, open-type heat pump unit with thermal storage, characterized in that, include: Absorption tower (1), low temperature solution storage tank (2), evaporator (3), heat exchanger (4), compressor (5), expansion valve (6), high temperature solution storage tank (7), condenser (8), steam compressor (9), condenser (10). The absorption tower (1) has a flue gas inlet (101), a flue gas outlet (102), a solution inlet (103), and a solution outlet (104); The cryogenic solution storage tank (2) has a cryogenic solution return port (201), a cryogenic solution outlet (202), a solution inlet (203), and a solution outlet (204); The high-temperature solution storage tank (7) has a low-temperature solution inlet (701), a high-temperature solution outlet (702), a high-temperature solution inlet (703), and a low-temperature solution outlet (704); The condenser (8) includes a solution inlet (801), a solution outlet (802), a heat source inlet (803), a heat source outlet (804), and a steam outlet (805); The solution outlet (104) of the absorption tower (1) is connected to the low-temperature solution inlet (701) of the high-temperature solution storage tank (7), the low-temperature solution outlet (704) of the high-temperature solution storage tank (7) is connected to the solution inlet (1003) of the condenser (10), the solution outlet (1004) of the condenser (10) is connected to the solution inlet (801) of the concentrator (8), and the solution outlet (802) of the concentrator (8) is connected to the solution inlet (701) of the high-temperature solution storage tank (7). The high-temperature solution inlet (703) of the high-temperature solution storage tank (7) is connected to the high-temperature solution outlet (702) of the high-temperature solution storage tank (7) and the solution inlet (403) of the heat exchanger (4). The solution outlet (404) of the heat exchanger (4) is connected to the solution inlet (203) of the low-temperature solution storage tank (2). The solution outlet (204) of the low-temperature solution storage tank (2) is connected to the solution inlet (103) of the absorption tower (1). The low-temperature solution outlet (202) of the low-temperature solution storage tank (2) is connected to the solution inlet (301) of the evaporator (3), and the solution outlet (302) of the evaporator (3) is connected to the low-temperature solution return port (201) of the low-temperature solution storage tank (2). The refrigerant outlet (304) of the evaporator (3) is connected to the refrigerant inlet (501) of the compressor (5), the refrigerant outlet (502) of the compressor (5) is connected to the refrigerant inlet (1002) of the condenser (10), the refrigerant outlet (1001) of the condenser (10) is connected to the refrigerant inlet (602) of the expansion valve (6), and the refrigerant outlet (601) of the expansion valve (6) is connected to the refrigerant inlet (303) of the evaporator (3). The steam outlet (805) of the condenser (8) is connected to the steam inlet (901) of the steam compressor (9), and the steam outlet (902) of the steam compressor (9) is connected to the heat source inlet (803) of the condenser (8). The return water of the heat user is connected to the inlet (401) of the heat exchanger (4), and the outlet (402) of the heat exchanger (4) is connected to the supply water of the heat user. The flue gas to be treated is connected to the flue gas inlet (101) of the absorption tower (1).

2. The electrically driven open-type heat pump unit as described in claim 1, characterized in that: The solution outlet (104) of the absorption tower (1) is connected to the solution inlet (103) of the absorption tower (1).

3. The electrically driven open-type heat pump unit as described in claim 2, characterized in that, Also includes: A gas-liquid separator (11) includes an inlet (1101), a gas outlet (1102), and a solution outlet (1103); The condenser (8) also has a return port (806); The inlet (1101) of the gas-liquid separator (11) is connected to the steam outlet (805) of the condenser (8), the gas outlet (1102) of the gas-liquid separator (11) is connected to the steam inlet (901) of the steam compressor (9), and the solution outlet (1103) of the gas-liquid separator (11) is connected to the liquid return port (806) of the condenser (8).

4. The electrically driven open-type heat pump unit as described in claim 1, characterized in that: The high-temperature solution storage tank (7) also has a replenishment port (705), which is connected to the replenishment solution.

5. The electrically driven open-type heat pump unit as described in claim 1, characterized in that: The absorption tower (1) also has a drain outlet (105), which is connected to the outside.

6. A heating system for an electrically driven, open-loop thermal storage heat pump, characterized in that: A heating system for an electric-driven thermal storage open-type heat pump unit is constructed using any one of claims 1-5. The flue gas mentioned above is boiler flue gas, power plant flue gas, or industrial flue gas; The heat users are either heating users or materials that require heating during the production process.

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