Heat recovery system and power supply system

Abstract

The present invention discloses a heat recovery system and a power supply system. Among them, the heat recovery system includes a first condenser, a first cooling tower, an absorption heat pump, a first control valve and a second control valve. The first condenser has a first water outlet and a first water return port arranged at intervals. The first condenser is provided with a first pipeline extending from the first water outlet and a second pipeline communicating with the first pipeline. The length of the second pipeline is greater than that of the first pipeline. One end of the first cooling tower is respectively connected to one end of the first pipeline far from the first water outlet and one end of the second pipeline far from the first pipeline. The other end of the first cooling tower is connected to the first water return port. The first control valve is arranged on the first pipeline, and the first control valve is located between the absorption heat pump and the first cooling tower. The second control valve is arranged on the second pipeline. The technical solution of the present invention aims to adjust the water temperature of the surplus hot water entering the absorption heat pump to improve the thermal efficiency of the absorption heat pump.

Description

Technical Field

[0001] The present invention relates to the technical field of power supply equipment, and particularly relates to a heat recovery system and a power supply system. Background Art

[0002] Using absorption heat pump technology to extract heat from circulating water for heating is an important means for thermal power plants to save energy and reduce consumption. The generator set includes a steam turbine, a condenser, an absorption heat pump and a boiler connected in sequence. The condenser condenses the steam discharged from the steam turbine into surplus hot water, and then the surplus hot water enters the absorption heat pump for operation and utilization to heat the boiler feed water in the boiler, thereby reducing the heat for heating the boiler feed water in the boiler and improving the comprehensive efficiency of the generator set. However, this energy-saving method is affected by factors such as temperature changes in the initial cold period, severe cold period and final cold period of heating, and the load of the steam turbine, resulting in large changes in the temperature of the surplus hot water entering the heat pump, thus affecting the thermal efficiency of the absorption heat pump. Summary of the Invention

[0003] The main object of the present invention is to provide a heat recovery system and a power supply system, aiming to adjust the water temperature of the surplus hot water entering the absorption heat pump to improve the thermal efficiency of the absorption heat pump.

[0004] To achieve the above object, a heat recovery system proposed by the present invention includes:

[0005] A first condenser having a first water outlet and a first water return port arranged at intervals. The first condenser is provided with a first pipeline extending from the first water outlet and a second pipeline communicating with the first pipeline, and the length of the second pipeline is greater than the length of the first pipeline;

[0006] A first cooling tower, one end of which is respectively connected to one end of the first pipeline far from the first water outlet and one end of the second pipeline far from the first pipeline; the other end of the first cooling tower is connected to the first water return port;

[0007] An absorption heat pump, both ends of which are respectively connected to the first pipeline and the first cooling tower;

[0008] A first control valve provided in the first pipeline, the first control valve being located between the absorption heat pump and the first cooling tower; and

[0009] A second control valve provided in the second pipeline.

[0010] In one embodiment, the heat recovery system further includes a second condenser, which has a second water outlet and a second water return port arranged at intervals. The second condenser is provided with a third pipeline extending from the second water outlet, and the third pipeline is communicated with the second pipeline. The first cooling tower is communicated with the second water return port.

[0011] In one embodiment, the heat recovery system further includes a second cooling tower connected to the second pipeline and arranged adjacent to the first cooling tower.

[0012] In one embodiment, the heat recovery system further includes a connecting ditch between the first cooling tower and the second cooling tower, and the connecting ditch is used to connect the first cooling tower and the second cooling tower so that the water levels of the first cooling tower and the second cooling tower are equal.

[0013] In one embodiment, the heat recovery system further includes a water level sensor arranged in the connecting ditch, and the water level sensor is used to detect the water level in the connecting ditch.

[0014] In one embodiment, the heat recovery system further includes a fourth pipeline connected to the first pipeline and a third control valve arranged on the fourth pipeline. One end of the fourth pipeline far from the first pipeline is communicated with the absorption heat pump.

[0015] In one embodiment, the first cooling tower includes a first body and a first circulating pump connected to the first body. One end of the first circulating pump far from the first body is communicated with the first water return port, and the first body is communicated with one end of the first pipeline far from the first water outlet.

[0016] In one embodiment, the heat recovery system further includes a first temperature sensor and a main controller arranged on the outer wall of the absorption heat pump. The first temperature sensor is electrically connected to the main controller, and the first temperature sensor is used to detect the ambient temperature so that the main controller controls the opening and closing of the first control valve or the second control valve according to the ambient temperature.

[0017] In one embodiment, the heat recovery system further includes a second temperature sensor arranged at the first water outlet. The second temperature sensor is electrically connected to the main controller, and the second temperature sensor is used to detect the water outlet temperature of the first condenser so that the main controller controls the opening and closing of the first control valve or the second control valve according to the water outlet temperature of the first condenser.

[0018] The present invention further provides a power supply system, which includes a steam turbine, a boiler and the heat recovery system. The steam turbine is connected to the first condenser of the heat recovery system, and the first condenser is used to condense the waste steam discharged by the steam turbine; a part of the absorption heat pump passes through the boiler so that the surplus hot water in the absorption heat pump exchanges heat with the boiler water in the boiler.

[0019] The heat recovery system of the technical solution of the present invention includes a first condenser, a first cooling tower, an absorption heat pump, a first control valve and a second control valve. The first condenser has a first water outlet and a first water return port arranged at intervals. The first condenser is provided with a first pipeline extending from the first water outlet and a second pipeline communicating with the first pipeline. The length of the second pipeline is greater than that of the first pipeline; one end of the first cooling tower is respectively connected to the first pipeline and the second pipeline; the other end of the first cooling tower is connected to the first water return port; both ends of the absorption heat pump are respectively connected to the first pipeline and the first cooling tower; the first control valve is arranged on the first pipeline, and the second control valve is arranged on the second pipeline; with such a setting, by controlling the opening and closing of the first control valve on the first pipeline and the second control valve on the second pipeline, the cooling flow path of the surplus hot water entering the first cooling tower and the water volume of the surplus hot water are controlled, so that the surplus hot water flowing out of the first condenser can be effectively temperature-regulated, and further more adapted to the application of the absorption heat pump in different heating periods, thereby improving the thermal efficiency of the absorption heat pump. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] In order to more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the following will briefly introduce the drawings required for use in the description of the embodiments or the prior art. Obviously, the drawings in the following description are only some embodiments of the present invention. For those of ordinary skill in the art, without creative efforts, other drawings can be obtained based on the structures shown in these drawings.

[0021] Figure 1 It is a schematic structural diagram of the heat recovery system of the present invention at the initial stage of heating;

[0022] Figure 2 It is a schematic structural diagram of the heat recovery system of the present invention at the middle stage of heating;

[0023] Figure 3 It is a schematic structural diagram of the heat recovery system of the present invention at the later stage of heating.

[0024] Explanation of the reference numerals in the drawings:

[0025]

[0026]

[0027] The realization, functional features and advantages of the object of the present invention will be further described with reference to the embodiments and the accompanying drawings. Detailed implementation manners

[0028] The following will clearly and completely describe the technical solutions in the embodiments of the present invention with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without creative efforts shall fall within the protection scope of the present invention.

[0029] It should be noted that all directional indications (such as up, down, left, right, front, back,...) in the embodiments of the present invention are only used to explain the relative positional relationship and movement conditions between components in a specific posture (as shown in the accompanying drawings). If the specific posture changes, the directional indications will also change accordingly.

[0030] In addition, the descriptions involving "first", "second", etc. in the present invention are only for descriptive purposes, and cannot be understood as indicating or implying their relative importance or implicitly indicating the quantity of the indicated technical features. Thus, the features defined with "first" and "second" may explicitly or implicitly include at least one such feature. In addition, the technical solutions between various embodiments can be combined with each other, but it must be based on the fact that those of ordinary skill in the art can implement them. When the combination of technical solutions is contradictory or cannot be implemented, it should be considered that such a combination of technical solutions does not exist and is not within the protection scope required by the present invention.

[0031] The present invention provides a heat recovery system.

[0032] In the embodiments of the present invention, refer to Figures 1 to 3, the heat recovery system includes a first condenser 10, a first cooling tower 20, an absorption heat pump 30, a first control valve 40 and a second control valve 50. The first condenser 10 has a first water outlet 10a and a first water return port 10b arranged at intervals. The first condenser 10 is provided with a first pipeline 11 extending from the first water outlet 10a and a second pipeline 12 communicating with the first pipeline 11. The length of the second pipeline 12 is greater than that of the first pipeline 11. One end of the first cooling tower 20 is communicated with one end of the first pipeline 11 far from the first water outlet 10a, and one end of the first cooling tower 20 is communicated with one end of the second pipeline 12 far from the first pipeline 11. The other end of the first cooling tower 20 is communicated with the first water return port 10b. Both ends of the absorption heat pump 30 are respectively communicated with the first pipeline 11 and the first cooling tower 20. The first control valve 40 is arranged on the first pipeline 11, and the first control valve 40 is located between the absorption heat pump 30 and the first cooling tower 20. The second control valve 50 is arranged on the second pipeline 12.

[0033] In this embodiment, in addition to condensing the exhaust steam of the steam turbine into surplus hot water for the boiler to reuse by the first condenser 10, a vacuum can also be established and maintained at the exhaust of the steam turbine. The functions of the first condenser: Using water or air as the cooling medium, directly or indirectly contacting the steam, condensing the steam into water, establishing and maintaining a certain vacuum at the exhaust port of the steam turbine, enabling the steam entering the steam turbine to expand to the lowest possible cold end pressure, increasing the ideal heat drop in the steam turbine, and improving the cycle thermal efficiency. The structure of the condenser consists of a shell, a water chamber, a tube sheet, cooling tubes, an intermediate tube sheet, a steam baffle and a collector, etc., which is a fully welded structure. The shell and the water chamber are welded into a whole, and the shell is a steel plate welded structure. And the first condenser 10 is provided with condensate pumps at the water inlet and outlet of the cooling tubes respectively, referring to the structure of the first condenser 10 in Figures 1 to 3 .

[0034] The heat recovery system has the initial heating period, the middle heating period and the late heating period. The initial heating period, the middle heating period and the late heating period are distinguished according to the ambient temperature. That is, the ambient temperature in the initial heating period is higher than 0°C, the ambient temperature in the middle heating period is lower than 0°C, and the ambient temperature in the late heating period is lower than -8°C;

[0035] When in the initial stage of heating, the absorption heat pump 30 requires low-temperature surplus hot water; the first control valve 40 of the first pipeline 11 is opened, and the second control valve 50 of the second pipeline 12 is closed. The surplus hot water enters the first pipeline 11 from the first water outlet 10a of the first condenser 10. The surplus hot water in the first pipeline 11 is divided into two parts. One part enters the absorption heat pump 30, and the other part enters the first cooling tower 20. Given that the length of the first pipeline 11 is short, more surplus hot water enters the first cooling tower 20. The first cooling tower 20 cools down a large amount of surplus hot water and re-enters it into the first condenser 10. At this time, the first control valve 40 is also closed, so that the cooled surplus hot water enters the absorption heat pump 30 again. Then, more cooled surplus hot water is mixed with the uncooled surplus hot water to form low-temperature surplus hot water, thus better adapting to the heating temperature of the absorption heat pump 30 in the initial stage of heating;

[0036] When in the middle stage of heating, the absorption heat pump 30 requires moderately-temperatureed surplus hot water; the first control valve 40 of the first pipeline 11 is closed, and the second control valve of the second pipeline 12 is opened. The surplus hot water flows through part of the first pipeline 11 from the first water outlet 10a of the first condenser 10 and then enters the second pipeline 12 and the absorption heat pump 30 respectively. Given that the length of the second pipeline 12 is long, at the same water flow rate, less surplus hot water enters the first cooling tower 20 in the same time. And the surplus hot water will also dissipate heat appropriately when flowing through the longer second pipeline 12. The first cooling tower 20 cools down a medium amount of surplus hot water and re-enters it into the first condenser 10. At this time, the second control valve 50 is also closed, so that the cooled surplus hot water enters the absorption heat pump 30 again. Then, a medium amount of cooled surplus hot water is mixed with the uncooled surplus hot water to form moderately-temperatureed surplus hot water, thus adapting to the heating temperature of the absorption heat pump 30 in the middle stage of heating;

[0037] When in the late stage of heating, the absorption heat pump 30 requires high-temperature surplus hot water; both the first control valve 40 of the first pipeline 11 and the second control valve 50 of the second pipeline 12 are closed. The surplus hot water flows through part of the first pipeline 11 from the first water outlet 10a of the first condenser 10 and then all enters the absorption heat pump 30. The surplus hot water does not pass through the first cooling tower 20 for cooling. And the pipeline between the first water outlet 10a and the absorption heat pump 30 is the shortest, so that the temperature drop of the surplus hot water is the smallest, thus adapting to the heating temperature of the absorption heat pump 30 in the late stage of heating.

[0038] As can be seen from the above statement, by controlling the opening and closing of the first control valve 40 of the first pipeline 11 and the second control valve 50 of the second pipeline 12, the cooling flow path of the surplus hot water entering the first cooling tower 20 and the amount of the surplus hot water are controlled, so that the surplus hot water flowing out of the first condenser 10 can be effectively temperature-regulated, and thus it is more suitable for the application of the absorption heat pump 30 in different heating periods, thereby improving the thermal efficiency of the absorption heat pump 30.

[0039] The heat recovery system of the technical solution of the present invention includes a first condenser 10, a first cooling tower 20, an absorption heat pump 30, a first control valve 40 and a second control valve 50. The first condenser 10 has a first water outlet 10a and a first water return port 10b arranged at intervals. The first condenser 10 is provided with a first pipeline 11 extending from the first water outlet 10a and a second pipeline 12 communicating with the first pipeline 11. The length of the second pipeline 12 is greater than the length of the first pipeline 11. One end of the first cooling tower 20 is respectively communicated with the first pipeline 11 and the second pipeline 12. The other end of the first cooling tower 20 is communicated with the first water return port 10b. Both ends of the absorption heat pump 30 are respectively communicated with the first pipeline 11 and the first cooling tower 20. The first control valve 40 is arranged on the first pipeline 11, and the second control valve 50 is arranged on the second pipeline 12. With such a setting, by controlling the opening and closing of the first control valve 40 of the first pipeline 11 and the second control valve 50 of the second pipeline 12, the cooling flow path of the surplus hot water entering the first cooling tower 20 and the amount of the surplus hot water are controlled, so that the surplus hot water flowing out of the first condenser 10 can be effectively temperature-regulated, and thus it is more suitable for the application of the absorption heat pump 30 in different heating periods, thereby improving the thermal efficiency of the absorption heat pump 30.

[0040] In one embodiment, referring to Figures 1 to 3 , the heat recovery system further includes a second condenser 60. The second condenser 60 has a second water outlet 60a and a second water return port 60b arranged at intervals. The second condenser 60 is provided with a third pipeline 61 extending from the second water outlet 60a. The third pipeline 61 is communicated with the second pipeline 12, and the first cooling tower 20 is communicated with the second water return port 60b.

[0041] In this embodiment, by setting the second condenser 60 and the third pipeline 61, the amount of the surplus hot water entering the second pipeline 12 and the first pipeline 11 can be increased, thereby increasing the heat supply amount of the absorption heat pump 30. And when it is in the later stage or the middle stage of heating, the environmental temperature is very low. The surplus hot water is formed by heat exchange through the first condenser 10 and the second condenser 60 at the same time, thereby increasing the overall temperature of the whole heat recovery system and avoiding the frosting or icing of the first pipeline 11 and the second pipeline 12.

[0042] In one embodiment, referring to Figures 1 to 3, the heat recovery system further includes a second cooling tower 70 connected to the second pipeline 12 and disposed adjacent to the first cooling tower 20.

[0043] In this embodiment, one end of the second cooling tower 70 away from the second pipeline 12 is not connected to the first water return port 10b of the first condenser 10 and the second water return port 60b of the second condenser 60; when the surplus hot water enters the second pipeline 12, part of the surplus hot water enters the second cooling tower 70 for cooling, and the rest of the surplus hot water enters the first cooling tower 20 for cooling, thereby accelerating the cooling rate of the surplus hot water and improving the operating efficiency of the heat recovery system.

[0044] Define the pipeline connecting the second water return port 60b of the second condenser 60 to the first cooling tower 20 as the second water return pipeline, the second water return pipeline is connected to the second pipeline 12, define the pipeline connecting the first water return port 10b of the first condenser 10 as the first water return pipeline, the first water return pipeline is connected to the second pipeline 12; and a first water return connection gate is provided on the second pipeline 12; when in the middle stage of heating, after the surplus hot water enters the first cooling tower 20 from the second pipeline 12, the first water return connection gate is closed at this time, so that the surplus hot water returned from the first cooling tower 20 will not enter the second pipeline 12 again, so that the surplus hot water can orderly return from the first cooling tower 20 to the first condenser 10.

[0045] In one embodiment, refer to Figures 1 to 3 , the heat recovery system further includes a connection ditch 80 between the first cooling tower 20 and the second cooling tower 70, and the connection ditch 80 is used to connect the first cooling tower 20 and the second cooling tower 70 so that the water levels of the first cooling tower 20 and the second cooling tower 70 are equal.

[0046] In this embodiment, the first cooling tower 20 and the second cooling tower 70 form a siphon structure through the connection ditch 80. When the water level of the surplus hot water entering the first cooling tower 20 is relatively high, part of the surplus hot water in the first cooling tower 20 will enter the second cooling tower 70 for cooling, so that the first cooling tower 20 and the second cooling tower 70 cool the same amount of surplus hot water at the same time, thereby accelerating the cooling rate of the surplus hot water.

[0047] When in the middle stage of heating, the first water return connection gate is closed, so that the first water return pipeline and the second water return pipeline form independent pipelines, and the surplus hot water can enter the first cooling tower 20 and the second cooling tower 70 respectively through the second pipeline 12.

[0048] In one embodiment, refer to Figures 1 to 3, the heat recovery system further includes a water level sensor disposed in the connection trench 80 for detecting the water level in the connection trench 80. With this arrangement, when the water level sensor detects the water level of the surplus hot water in the connection trench 80 and sends the water level parameter to the main controller, the main controller can further calculate the amount of surplus hot water cooled by the first cooling tower 20 and the second cooling tower 70 based on the water level parameter, and further control the speed of condensing the surplus hot water in the first condenser 10 and the second condenser 60, so as to effectively control the heat supply of the entire heat recovery system.

[0049] In one embodiment, referring to Figures 1 to 3 , the heat recovery system further includes a fourth pipeline 90 connected to the first pipeline 11 and a third control valve 100 disposed in the fourth pipeline 90. One end of the fourth pipeline 90 far from the first pipeline 11 is communicated with the absorption heat pump 30.

[0050] In this embodiment, when the first water outlet 10a of the first condenser 10 and the second water outlet 60a of the second condenser 60 both stop discharging water, and when the cooled surplus hot water and the uncooled surplus hot water enter the absorption heat pump 30 through the fourth pipeline 90, or when all the uncooled surplus hot water enters the absorption heat pump 30 through the fourth pipeline 90, the third control valve 100 is controlled to close at this time to prevent the surplus hot water from flowing back from the absorption heat pump 30 to the first pipeline 11 through the fourth pipeline 90 and affecting the normal flow direction of the surplus hot water; with this arrangement, the surplus hot water can flow into the first cooling tower 20 from the absorption heat pump 30 and then flow back to the first condenser 10 and the second condenser 60 in an orderly manner.

[0051] In one embodiment, referring to Figures 1 to 3 , the first cooling tower 20 includes a first body 21 and a first circulation pump 22 connected to the first body 21. One end of the first circulation pump 22 far from the first body 21 is communicated with the first water return port 10b, and the first body 21 is communicated with one end of the first pipeline 11 far from the first water outlet 10a.

[0052] In this embodiment, the first circulation pump 22 is used to accelerate the flow rate of the surplus hot water entering the first body 21, thereby increasing the cooling speed of the first cooling tower 20 and the amount of surplus hot water entering the first cooling tower 20; similarly, the second cooling tower 70 includes a second body and a second circulation pump connected to the second body, and the second body is communicated with the second pipeline 12.

[0053] In one embodiment, referring to Figures 1 to 3 , the heat recovery system further includes a first temperature sensor disposed on the outer wall of the absorption heat pump 30 and a main controller. The first temperature sensor is electrically connected to the main controller, and the first temperature sensor is used to detect the ambient temperature so that the main controller can control the opening and closing of the first control valve 40 or the second control valve 50 according to the ambient temperature.

[0054] In this embodiment, the ambient temperature is detected by the first temperature sensor, so that the main controller can control the opening and closing of the first control valve 40 or the second control valve 50 according to more accurate ambient temperature parameters, thereby more effectively controlling the heating capacity of the heat recovery system.

[0055] In one embodiment, referring to Figures 1 to 3 , the heat recovery system further includes a second temperature sensor disposed at the first water outlet 10a. The second temperature sensor is electrically connected to the main controller. The second temperature sensor is used to detect the water outlet temperature of the first condenser 10, so that the main controller controls the opening and closing of the first control valve 40 or the second control valve 50 according to the water outlet temperature of the first condenser 10.

[0056] In this embodiment, the water outlet temperature of the first condenser 10 is detected by the second temperature sensor, so that the main controller can control the opening and closing of the first control valve 40 or the second control valve 50 according to more accurate water outlet temperature parameters, thereby more effectively controlling the heating capacity of the heat recovery system.

[0057] The present invention also proposes a power supply system. Referring to Figures 1 to 3 , the power supply system includes a steam turbine, a boiler and the heat recovery system. The steam turbine is connected to the first condenser 10 of the heat recovery system. The first condenser 10 is used to condense the waste steam discharged by the steam turbine; part of the absorption heat pump 30 is disposed through the boiler, so that the surplus hot water in the absorption heat pump 30 exchanges heat with the boiler water in the boiler. The specific structure of this heat recovery system refers to the above embodiment. Since this power supply system adopts all the technical solutions of the above all embodiments, it at least has all the beneficial effects brought by the technical solutions of the above embodiments, and will not be elaborated here one by one.

[0058] In this embodiment, at different ambient temperatures, the temperature of the boiler water heated by the boiler is also different. In this embodiment, through the cooling of the first cooling tower 20 or the second cooling tower 70 of the heat recovery system, the temperature of the surplus hot water entering the absorption heat pump 30 is adjusted, so as to adjust the heat exchange temperature with the boiler water of the boiler, so that the heat of the surplus hot water of the absorption heat pump 30 can be completely transferred to the boiler water, reducing the heat waste of the surplus hot water and improving the thermal efficiency of the absorption heat pump 30.

[0059] The above are only the preferred embodiments of the present invention, and do not limit the patent scope of the present invention. Any equivalent structural transformation made under the inventive concept of the present invention by using the content of the specification and drawings of the present invention, or directly / indirectly applied in other related technical fields, is included in the patent protection scope of the present invention.

Claims

1. A heat recovery system, characterized in that: The heat recovery system comprises: a first condenser, the first condenser having a first water outlet and a first water return port spaced apart from each other, the first condenser being provided with a first pipeline extending from the first water outlet and a second pipeline connected to the first pipeline, the second pipeline being longer than the first pipeline; a first cooling tower, one end of the first cooling tower being connected to an end of the first pipeline away from the first water outlet and an end of the second pipeline away from the first pipeline; and the other end of the first cooling tower being connected to the first water return port; an absorption heat pump, wherein both ends of the absorption heat pump are respectively connected to the first pipeline and the first cooling tower; a first control valve, provided in the first pipeline, the first control valve being located between the absorption heat pump and the first cooling tower; and The second control valve is provided in the second pipeline.

2. The heat recovery system according to claim 1, wherein: The heat recovery system also includes a second condenser having a second water outlet and a second water return port that are spaced apart. The second condenser is provided with a third pipeline extending from the second water outlet, the third pipeline is connected to the second pipeline, and the first cooling tower is connected to the second water return port.

3. The heat recovery system according to claim 2, wherein: The heat recovery system further includes a second cooling tower connected to the second pipeline, and the second cooling tower is disposed adjacent to the first cooling tower.

4. The heat recovery system according to claim 3, characterized in that The heat recovery system further includes a communication channel between the first cooling tower and the second cooling tower, wherein the communication channel connects the first cooling tower and the second cooling tower so that the water level of the first cooling tower is equal to the water level of the second cooling tower.

5. The heat recovery system according to claim 4, characterized in that The heat recovery system further includes a water level sensor provided in the communication ditch, and the water level sensor is used to detect the water level in the communication ditch.

6. The heat recovery system according to claim 1, wherein: The heat recovery system further includes a fourth pipeline connected to the first pipeline and a third control valve provided on the fourth pipeline. An end of the fourth pipeline away from the first pipeline is in communication with the absorption heat pump.

7. The heat recovery system according to claim 1, wherein: The first cooling tower includes a first body and a first circulation pump connected to the first body. The end of the first circulation pump away from the first body is connected to the first water return port. The first body is connected to the end of the first pipeline away from the first water outlet.

8. The heat recovery system according to any one of claims 1 to 7, characterized in that: The heat recovery system also includes a first temperature sensor and a main controller provided on the outer wall of the absorption heat pump. The first temperature sensor is electrically connected to the main controller. The first temperature sensor is used to detect the ambient temperature so that the main controller controls the opening and closing of the first control valve or the second control valve according to the ambient temperature.

9. The heat recovery system according to claim 8, wherein: The heat recovery system also includes a second temperature sensor provided at the first water outlet, the second temperature sensor being electrically connected to the main controller, and the second temperature sensor being used to detect the outlet water temperature of the first condenser so that the main controller controls the opening and closing of the first control valve or the second control valve according to the outlet water temperature of the first condenser.

10. A power supply system, characterized in that: The power supply system includes a steam turbine, a boiler and a heat recovery system as described in any one of claims 1 to 9, the steam turbine is connected to the first condenser of the heat recovery system, and the first condenser is used to condense the waste steam discharged by the steam turbine; part of the absorption heat pump is installed in the boiler to exchange heat with the waste hot water in the absorption heat pump and the boiler water in the boiler.

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