Energy-saving intelligent water supplementing and cooling integrated large-temperature-difference absorption heat pump heat exchange unit

Abstract

The utility model discloses an integrated type big temperature difference absorption type heat pump heat exchange unit of energy -conserving type intelligent water replenishing cooling, related to heat exchange unit technical field, this integrated type big temperature difference absorption type heat pump heat exchange unit of energy -conserving type intelligent water replenishing cooling, including big temperature difference absorption type heat pump unit main part, intelligent water replenishing cooling main part, big temperature difference absorption type heat pump main part includes big temperature difference absorption type heat pump, first plate heat exchanger, high temperature side pipe network, low temperature side pipe network, intelligent water replenishing cooling main part is provided with water replenishing constant pressure pump, second plate heat exchanger, water replenishing tank, water replenishing pipeline and pipeline accessory. The unit under the premise of satisfying big temperature difference absorption type heat pump unit main part heat supply demand, make high temperature side return water temperature further reduce, increase high temperature side pipe network supply return water temperature difference, improve its heat delivery capacity, can also preheat the water replenishing of low temperature side simultaneously, thereby improve the heat exchange efficiency of whole heat exchange system, make whole heat supply system reach the purpose of energy -conserving, reduce consumption, reduce carbon finally.

Description

Technical Field

[0001] This utility model relates to the field of heat exchanger technology, specifically to an energy-saving, intelligent water replenishment and cooling integrated large temperature difference absorption heat pump heat exchanger. Background Technology

[0002] Secondary heat exchange stations are important facilities in centralized heating systems. They are mainly used to convert high-temperature hot water or steam generated by heat sources into low-temperature hot water that meets the needs of users, and then transport it to residential communities or buildings through secondary pipelines.

[0003] Existing makeup water systems in secondary heat exchange stations generally fall into two categories: one monitors the return water pressure on the low-temperature side, and activates a makeup water pump to replenish the water supply if it falls below a set rated pressure. The makeup water is chilled water produced by the softened water system, which is then directly added to the return water supply on the low-temperature side. The other method uses return water from the high-temperature side to replenish the return water on the low-temperature side. A branch line is installed between the high-temperature and low-temperature return water networks, and an electric valve is installed on this branch line. By controlling the opening and closing of the electric valve, the high-temperature side water is replenished to the low-temperature side water.

[0004] However, both methods have significant drawbacks: The first method uses low-temperature cold water, directly lowering the low-temperature return water temperature, but the return water temperature of the high-temperature side network (primary network) remains unchanged. The second method, while using higher-temperature return water, also fails to lower the high-temperature return water temperature. More importantly, neither method utilizes the low-temperature cold source of the replenished water to further reduce the return water temperature of the high-temperature side network. Furthermore, the cold water (or relatively low-temperature water) supplied from the low-temperature side is not preheated, resulting in reduced heat exchange efficiency across the entire heat exchange station system. The temperature difference in the high-temperature side network is not maximized, and the network's heat transfer capacity is not fully utilized.

[0005] Therefore, there is an urgent need for a new type of heat exchanger system capable of simultaneously reducing the high-temperature return water temperature and preheating the low-temperature makeup water. To address this, an energy-saving, intelligent makeup water cooling integrated large-temperature-difference absorption heat pump heat exchanger is proposed to solve the problems existing in current heat exchange systems. Utility Model Content

[0006] The purpose of this invention is to provide an energy-saving, intelligent, integrated large-temperature-difference absorption heat pump heat exchanger unit for water replenishment and cooling, to solve the problem of low water replenishment temperature in existing secondary heat exchange stations mentioned in the background art. Existing water replenishment technologies generally fall into two categories: one involves monitoring the return water pressure on the low-temperature side; if the pressure drops below a set rated pressure, a constant-pressure water replenishment pump is activated to replenish the water, which is chilled water produced by a softened water system, directly adding it to the return water on the low-temperature side. The other method uses high-temperature side return water to replenish low-temperature side return water. A branch line is set between the high-temperature and low-temperature side pipe networks, and an electric valve is installed on this branch line. By controlling the opening and closing of the electric valve, high-temperature side return water is replenished to low-temperature side return water. However, the low-temperature side replenishment uses a low-temperature cold source, and the high-temperature side return water temperature does not decrease synchronously, nor is the low-temperature side replenishment water preheated, resulting in low heat exchange efficiency for the entire heat exchange station system.

[0007] To achieve the above objectives, this utility model provides the following technical solution: an energy-saving intelligent water replenishment and cooling integrated large temperature difference absorption heat pump heat exchanger unit, comprising a large temperature difference absorption heat pump unit body and an intelligent water replenishment system. The large temperature difference absorption heat pump unit body includes a large temperature difference absorption heat pump, a first plate heat exchanger, a high-temperature side pipe network, and a low-temperature side pipe network. A high-temperature side pipe network is provided on one side of the large temperature difference absorption heat pump unit body, and the high-temperature side medium is cooled by the large temperature difference absorption heat pump and the first plate heat exchanger. A low-temperature side pipe network is provided on the other side of the large temperature difference absorption heat pump unit body, and the low-temperature side medium is heated by the absorption heat pump and the first plate heat exchanger. The intelligent water replenishment system includes a water replenishment constant pressure pump, a second plate heat exchanger, a water replenishment tank, water replenishment pipes and pipe fittings, and heat exchange pipes.

[0008] Preferably, the outlet of the water supply tank is connected to the inlet of the water supply pressure pump, and the outlet of the water supply pressure pump is connected to the cold end inlet of the second plate heat exchanger.

[0009] Preferably, the outlet of the water supply tank is connected to the inlet of the water supply pressure pump via the water supply pipe, the outlet of the water supply pressure pump is connected to the cold water inlet of the second plate heat exchanger via the water supply pipe, and the hot end of the second plate heat exchanger is connected to the high-temperature side return water pipe via the heat exchange pipe.

[0010] Preferably, the cold end inlet of the second plate heat exchanger is connected to the outlet of the makeup water constant pressure pump, the cold end outlet of the second plate heat exchanger is connected to the makeup water inlet of the low-temperature side return water pipe, the hot end inlet of the second plate heat exchanger is connected to the first opening of the high-temperature side return water pipe through a heat exchange pipe, and the hot end outlet of the second plate heat exchanger is connected to the second opening of the high-temperature side return water pipe through a heat exchange pipe. High-temperature side electric regulating valves are installed at the first and second openings of the high-temperature side return water pipe.

[0011] Preferably, the high-temperature side pipe network includes a high-temperature side water supply pipe and a high-temperature side water return pipe, and the output end of the high-temperature side water supply pipe is connected to the input end of the large temperature difference absorption heat pump body, and the input end of the high-temperature side water return pipe is connected to the output end of the large temperature difference absorption heat pump body.

[0012] Preferably, the low-temperature side pipeline network includes a low-temperature side water supply pipe and a low-temperature side water return pipe. A low-temperature side circulating water pump is installed between the input end of the low-temperature side water return pipe and the input end of the large temperature difference absorption heat pump body. A low-temperature side electric regulating valve is installed between the input end of the low-temperature side water supply pipe and the output end of the large temperature difference absorption heat pump.

[0013] Preferably, a water supply pipe is provided between the second plate heat exchanger and the low-temperature side return water pipe, and the water in the low-temperature side supply water pipe is transported from the supply water pipe to the low-temperature side return water pipe after exchanging heat with the second plate heat exchanger.

[0014] Preferably, the input end of the high-temperature side water supply pipe and the output end of the high-temperature side water return pipe of the main body of the unit are connected to the output end and input end of the main body at the heat source, respectively.

[0015] Preferably, the output end of the low-temperature side water supply pipe and the input end of the low-temperature side water return pipe of the main body of the unit are connected to the input end and output end of the heat user, respectively.

[0016] Preferably, the water in the water supply tank is either cold water produced by the water softening system or cooling soft water supplied to the water supply tank by the high-temperature side return water; the intelligent electric regulating valve installed on the heat exchange pipe adjusts the flow rate by judging the temperature and flow rate of the soft water in the water supply pipe.

[0017] Compared with the prior art, the beneficial effects of this utility model are:

[0018] (1) This utility model achieves heat exchange through heat exchange components during the operation of the main unit. When in use, the makeup water constant pressure pump is started to transport the softened water in the makeup water tank to the second plate heat exchanger through the low-temperature side makeup water pipe. In the second plate heat exchanger, it indirectly exchanges heat with the return water of the high-temperature side pipe network. The temperature of the makeup water of the low-temperature side pipe network increases, and the heat is supplemented to the low-temperature side return water pipe through the makeup water pipe. Meanwhile, the return water of the high-temperature side pipe network exchanges heat with the makeup water of the low-temperature side pipe network through the heat exchange pipe via the second plate heat exchanger. The water after heat exchange enters the high-temperature side return water pipe and interacts with the absorption heat pump unit. The return water from the high-temperature side return water pipe is mixed, which further reduces the return water temperature of the high-temperature side pipe network of the heat exchange station. Through integrated optimization design of the system process, under the premise of meeting the heating demand and the pressure setting of the low-temperature side pipe network makeup water, the cold source of the low-temperature side pipe network makeup water is fully utilized to reduce the return water temperature of the high-temperature side pipe network, which further reduces the return water temperature of the high-temperature side pipe network. At the same time, the makeup water of the low-temperature side pipe network can be preheated without disrupting the hydraulic balance of the high-temperature side pipe network, thereby improving the heat exchange efficiency of the entire heat exchange station system and enabling the entire heating system to ultimately achieve the goal of energy saving and consumption reduction. Existing makeup water systems in secondary heat exchange stations generally fall into two categories: one involves monitoring the return water pressure on the low-temperature side and activating a makeup water pump when it falls below a set rated pressure. The makeup water is chilled water produced by the softened water system, which is then directly added to the return water on the low-temperature side. The other method involves using return water from the high-temperature side to replenish the return water on the low-temperature side. A branch line is set up between the high-temperature and low-temperature pipe networks, and an electric valve is installed on the branch line. By controlling the opening and closing of the electric valve, the high-temperature side water is replenished to the low-temperature side water. However, the low-temperature side makeup water is replenishing a low-temperature cold source, and the temperature of the high-temperature side return water does not decrease synchronously. The low-temperature side makeup water is also not preheated, resulting in low heat exchange efficiency for the entire heat exchange station system.

[0019] (2) By setting up high-temperature side pipe network and low-temperature side pipe network on both sides of the absorption heat pump unit, the adjustment strategy of the secondary network of the heat exchange station is changed through the high-temperature side pipe network and the low-temperature side pipe network. Combined with the operating characteristics of the large temperature difference absorption heat pump unit, the operating strategy and control logic of the entire low-temperature side circulating water pump are integrated with the operating strategy and control logic of the absorption heat pump unit, thereby reducing the power consumption of the secondary network circulating water pump during the entire heating season. Attached Figure Description

[0020] Figure 1 This is a schematic diagram of the main working process of the unit according to this utility model;

[0021] Figure 2 This is a schematic diagram of the overall workflow of this utility model;

[0022] In the diagram: 1. Main unit; 2. Intelligent water replenishment system; 3. Main unit of large temperature difference absorption heat pump; 4. High-temperature side piping network; 5. Low-temperature side piping network; 6. Heat source; 7. Heat user; 8. Low-temperature side circulating water pump; 9. High-temperature side electric regulating valve; 10. Low-temperature side electric regulating valve; 11. High-temperature side supply water pipe; 12. High-temperature side return water pipe; 13. Low-temperature side return water pipe; 14. Low-temperature side supply water pipe; 15. Water replenishment pressure pump; 16. Second plate heat exchanger; 17. Water replenishment pipe; 18. Low-temperature side soft water pipe; 19. Heat exchange pipe; 20. Water replenishment tank; 21. Intelligent water replenishment electric regulating valve 1; 22. Intelligent water replenishment electric regulating valve 2. Detailed Implementation

[0023] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present utility model. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments.

[0024] Please see Figure 1-2 An embodiment of this utility model is provided: an energy-saving intelligent water replenishment and cooling integrated large temperature difference absorption heat pump heat exchanger unit, including an intelligent water replenishment system 2, including a water replenishment constant pressure pump 15, a second plate heat exchanger 16, a water replenishment tank 20, a water replenishment pipe 17 and pipe accessories, and a heat exchange pipe 19. The water outlet of the water replenishment tank (20) is connected to the suction port of the water replenishment constant pressure pump (15) through the water replenishment pipe (17). The water outlet of the water replenishment constant pressure pump (15) is connected to the cold water inlet of the second plate heat exchanger (16) through the water replenishment pipe (17). The hot end inlet of the second plate heat exchanger 16 is connected to the first opening of the high temperature side return water pipe 12 through the heat exchange pipe 19. The hot end outlet is connected to the second opening of the high temperature side return water pipe 12 through the heat exchange pipe 19. The main body 3 of the large temperature difference absorption heat pump unit includes the absorption heat pump unit 3 and the first plate heat exchanger, the high temperature side pipe 4 and the low temperature side pipe network 5. The low temperature side pipe network 5 includes the low temperature side water supply pipe 13 and the low temperature side water return pipe 14. The low temperature side makeup water exchanges heat with the high temperature side return water through the second plate heat exchanger 16, which plays the role of preheating the low temperature side makeup water.

[0025] The high-temperature side piping network 4 includes a high-temperature side supply water pipe 11 and a high-temperature side return water pipe 12. The output end of the high-temperature side supply water pipe 11 is connected to the input end of the main body 3 of the large temperature difference absorption heat pump unit. A high-temperature side electric regulating valve 9 is installed between the input end of the high-temperature side return water pipe 12 and the output end of the main body 3 of the large temperature difference absorption heat pump unit. The first opening of the high-temperature side return water pipe 12 is connected to the input end of the heat exchange pipe 19. The water flow from the high-temperature side return water pipe 12 enters the second plate heat exchanger 16 through the input end of the heat exchange pipe 19 and then enters the high-temperature side return water pipe 12 from the output end of the heat exchange pipe 19. A low-temperature side circulating water pump 8 is installed between the output end of the low-temperature side return water pipe 13 and the input end of the low-temperature side return water of the main body 3 of the large temperature difference absorption heat pump unit. A low-temperature side electric regulating valve 9 is installed between the input end of the low-temperature side supply water pipe 14 and the output end of the main body 3 of the large temperature difference absorption heat pump unit. A water supply pipe 17 is provided between the valve 10, the second plate heat exchanger 16 and the low-temperature return water pipe 13. The water in the low-temperature soft water pipe 18 is transported from the water supply pipe 17 to the low-temperature return water pipe 13 after heat exchange through the second plate heat exchanger 16. The input and output ends of the high-temperature side of the main body 3 of the large temperature difference absorption heat pump unit are connected to the output ends of the high-temperature side water supply pipe 11 and the high-temperature side return pipe 12, respectively. The output and input ends of the low-temperature side of the main body 3 of the large temperature difference absorption heat pump unit are connected to the input ends of the low-temperature side water supply pipe 13 and the output ends of the low-temperature side return water pipe 14 of the heat user 7, respectively. The water in the water supply tank 20 is either cold water produced by the softened water system or cooling soft water supplemented to the water supply tank by the high-temperature side return water. The intelligent electric regulating valve installed on the heat exchange pipe (19) adjusts the flow rate by judging the temperature and flow rate of the soft water in the water supply pipe (17).

[0026] The makeup water constant pressure pump 15 is started, and the softened water in the makeup water tank 20 is first transported to the second plate heat exchanger 16 through the low-temperature side soft water pipe 18. The low-temperature side pipe network 5 makeup water undergoes indirect heat exchange with the high-temperature side pipe network 4 return water in the second plate heat exchanger 16. The temperature of the makeup water in the low-temperature side pipe network 5 rises, and it is replenished to the low-temperature side return water pipe 13 through the makeup water pipe 17. Meanwhile, the return water of the high-temperature side pipe network 4 passes through the heat exchange pipe 19 and the second plate heat exchanger 16 to exchange with the low-temperature side pipe network 5 makeup water. The water undergoes heat exchange and then enters the high-temperature side return water pipe 12, where it mixes with the return water from the high-temperature side return water pipe 12 of the large temperature difference absorption heat pump unit 3. Through an integrated and optimized system process design, under the premise of meeting heating demand and maintaining constant pressure for water replenishment in the low-temperature side pipe network 5, the cold source of the low-temperature chilled water replenished in the low-temperature side pipe network 5 is fully utilized to reduce the return water temperature of the high-temperature side pipe network 4, thereby further reducing the return water temperature of the high-temperature side pipe network 4. At the same time, the water replenished in the low-temperature side pipe network 5 can also be preheated.

[0027] It will be apparent to those skilled in the art that this invention is not limited to the details of the exemplary embodiments described above, and that it can be implemented in other specific forms without departing from the spirit or essential characteristics of this invention. Therefore, the embodiments should be considered illustrative and non-limiting in all respects, and the scope of this invention is defined by the appended claims rather than the foregoing description. Thus, it is intended that all variations falling within the meaning and scope of equivalents of the claims be included within this invention. No reference numerals in the claims should be construed as limiting the scope of the claims.

Claims

1. An energy-saving, intelligent water replenishment and cooling integrated large temperature difference absorption heat pump heat exchanger unit, comprising a large temperature difference absorption heat pump unit body (3) and an intelligent water replenishment system (2), characterized in that: The main body (3) of the large temperature difference absorption heat pump unit includes a large temperature difference absorption heat pump, a first plate heat exchanger, a high-temperature side pipe network, and a low-temperature side pipe network. A high-temperature side pipe network (4) is provided on one side of the large temperature difference absorption heat pump and the first plate heat exchanger, and a low-temperature side pipe network (5) is provided on the other side of the large temperature difference absorption heat pump and the first plate heat exchanger. The intelligent water replenishment system includes a water replenishment constant pressure pump (15), a second plate heat exchanger (16), a water replenishment tank (20), a water replenishment pipe (17), and pipe fittings. The intelligent water replenishment system is used to use the second plate heat exchanger (16) to exchange heat between the cold water from the water replenishment tank (20) and part of the return water from the high-temperature side pipe network (4) to reduce the return water temperature of the high-temperature side pipe network (4) and preheat the cold water.

2. The integrated large temperature difference absorption heat pump heat exchanger unit for energy-saving intelligent water replenishment and cooling according to claim 1, characterized in that: The outlet of the water supply tank (20) is connected to the inlet of the water supply constant pressure pump (15) through the water supply pipe (17), the outlet of the water supply constant pressure pump (15) is connected to the cold water inlet of the second plate heat exchanger (16) through the water supply pipe (17), and the hot end of the second plate heat exchanger (16) is connected to the high temperature side return water pipe (12) through the heat exchange pipe (19).

3. The integrated large temperature difference absorption heat pump heat exchanger unit for energy-saving intelligent water replenishment and cooling according to claim 2, characterized in that: The high-temperature side pipeline (4) includes a high-temperature side water supply pipe (11) and a high-temperature side return water pipe (12). The output end of the high-temperature side water supply pipe (11) is connected to the input end of the main body of the large temperature difference absorption heat pump unit. A high-temperature side electric regulating valve (9) is provided between the input end of the high-temperature side return water pipe (12) and the output end of the main body (3) of the large temperature difference absorption heat pump unit.

4. The integrated large temperature difference absorption heat pump heat exchanger unit for energy-saving intelligent water replenishment and cooling according to claim 3, characterized in that: The first opening of the high-temperature side return water pipe (12) is connected to the input end of the heat exchange pipe (19), and the water flow of the high-temperature side return water pipe (12) enters the second plate heat exchanger (16) through the input end of the heat exchange pipe (19) for heat exchange, and then enters the second opening of the high-temperature side return water pipe (12) from the output end of the heat exchange pipe (19).

5. The integrated large temperature difference absorption heat pump heat exchanger unit for energy-saving intelligent water replenishment and cooling according to claim 4, characterized in that: The low-temperature side pipeline (5) includes a low-temperature side water supply pipe (14) and a low-temperature side water return pipe (13). A low-temperature side circulating water pump (8) is installed between the output end of the low-temperature side water return pipe (13) and the low-temperature side input end of the main body (3) of the large temperature difference absorption heat pump unit. A low-temperature side electric regulating valve (10) is installed between the input end of the low-temperature side water supply pipe (14) and the output end of the main body (3) of the large temperature difference absorption heat pump unit.

6. The integrated large temperature difference absorption heat pump heat exchanger unit for energy-saving intelligent water replenishment and cooling according to claim 5, characterized in that: A water supply pipe (17) is provided between the second plate heat exchanger (16) and the low-temperature side return water pipe (13), and the cold water in the water supply tank (20) is transported from the water supply pipe (17) to the low-temperature side return water pipe (13) after heat exchange through the second plate heat exchanger (16).

7. The integrated large temperature difference absorption heat pump heat exchanger unit for energy-saving intelligent water replenishment and cooling according to claim 6, characterized in that: The input end of the high-temperature side water supply pipe (11) and the output end of the high-temperature side water return pipe (12) of the main body (3) of the large temperature difference absorption heat pump unit are respectively connected to the output end and input end of the heat source (6).

8. The integrated large temperature difference absorption heat pump heat exchanger unit for energy-saving intelligent water replenishment and cooling according to claim 7, characterized in that: The input end of the low-temperature side return water pipe (13) and the output end of the low-temperature side supply water pipe (14) of the main body (3) of the large temperature difference absorption heat pump unit are respectively connected to the output end and input end of the heat user (7).

9. The integrated large temperature difference absorption heat pump heat exchanger unit for energy-saving intelligent water replenishment and cooling according to claim 8, characterized in that: The water in the water supply tank (20) is the cooling soft water supplied to the water supply tank by the cold water produced by the softened water system or the high temperature side return water. The intelligent electric regulating valve installed on the heat exchange pipe (19) adjusts the flow rate by judging the temperature and flow rate of the soft water in the water supply pipe (17).

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