Waste heat recovery combined heat and power generation system

Abstract

The utility model provides a waste heat recovery combined heat and power generation system, and relates to the technical field of coal-fired power generation. The waste heat recovery combined heat and power generation system comprises a gas supply device used for providing high-temperature steam to a first-order heat exchange device; the first-order heat exchange device is connected with the second-order heat exchange device through a pipeline, a first medium circularly flows in the first-order heat exchange device, the first medium exchanges heat with high-temperature steam to form a first high-temperature medium, and the first high-temperature medium releases heat to heat a second medium flowing in the second-order heat exchange device to form a second high-temperature medium; the first high-temperature medium losing heat becomes a first medium; the second-order heat exchange device is connected with the heat supply network heating system through a pipeline, the second high-temperature medium is heated and boosted through the second-order heat exchange device to become a third high-temperature medium, the third high-temperature medium exchanges heat with heat supply network return water of the heat supply network heating system, and the third high-temperature medium losing heat becomes a second medium. The problem that steam waste heat cannot be effectively utilized in the power generation process of a thermal power generating unit in the prior art is solved.

Description

Technical Field

[0001] The utility model relates to the technical field of coal-fired power generation, and in particular to a waste heat recovery cogeneration system. Background Art

[0002] The cogeneration unit uses the heat-to-electricity method to adjust the electrical load, and has a strong thermal-electric coupling. However, in order to meet the demand for heating, this method requires a relatively high electrical load to be maintained, and the unit's peak-shaving capacity is very limited. How to achieve "thermal-electric decoupling" is a difficult problem that needs to be solved urgently for cogeneration units.

[0003] The loss of cooling source in the condenser is the part with the largest energy loss in coal-fired power plants. The latent heat of vaporization released by the condensation of the exhaust steam from the turbine in the condenser is absorbed by the circulating water from the cooling tower. The heated circulating water is sent to the cooling tower for cooling, and then the cooled circulating water is sent to the condenser again, thus completing a cycle. However, in this process, as the cooling tower has been used for many years, the heat exchange effect of the cooling tower is poor, and the circulating water temperature does not reach the design value, resulting in a high vacuum in the condenser of the unit, which in turn reduces the power generation capacity of the unit and affects the economy of the unit. How to reduce the heat exchange of the cooling tower and recover the heat of the circulating water is the key to improving the energy efficiency of the power plant. Therefore, there is an urgent need for a device that can solve at least one of the above problems. Utility Model Content

[0004] The purpose of the embodiment of the utility model is to provide a waste heat recovery cogeneration system for solving the problem in the prior art that waste steam heat cannot be effectively utilized during the power generation process of thermal power units.

[0005] In order to achieve the above object, the utility model provides a waste heat recovery cogeneration system, the waste heat recovery cogeneration system comprising:

[0006] An air supply device is connected to the first-stage heat exchange device through a pipeline and is used to provide high-temperature steam to the first-stage heat exchange device;

[0007] The first-order heat exchange device is connected to the second-order heat exchange device through a pipeline. A first medium circulates inside the first-order heat exchange device. The first medium exchanges heat with high-temperature steam to become a first high-temperature medium. The first high-temperature medium can heat the second medium flowing in the second-order heat exchange device to become a second high-temperature medium by releasing heat. The first high-temperature medium that loses heat in the first-order heat exchange device becomes the first medium again.

[0008] The second-order heat exchange device is connected to the heat network heating system through a pipeline. A second medium circulates inside the second-order heat exchange device. The second medium absorbs heat released by the first high-temperature medium to become a second high-temperature medium. The second high-temperature medium is heated and pressurized by the second-order heat exchange device to become a third high-temperature medium. The third high-temperature medium exchanges heat with the heat network return water of the heat network heating system in the second-order heat exchange device to heat the heat network return water. The third high-temperature medium that loses heat in the second-order heat exchange device becomes the second medium again.

[0009] Specifically, the waste heat recovery cogeneration system also includes: a heat network heater, which is connected to the gas supply device and the heat network heating system through a pipeline and is used to absorb heat from high-temperature steam to heat the heat network return water of the heat network heating system.

[0010] Specifically, the waste heat recovery cogeneration system also includes: a return water heater, which is connected to the heat network heater, the second-order heat exchange device and the heat network heating system through a pipeline, and is used to heat the heat network return water of the heat network heating system, and secondary heat the heat network return water after being heated by the second-order heat exchange device and the heat network heater.

[0011] Specifically, the first-order heat exchange device includes: a first heat exchanger, a second heat exchanger and a cooling tower;

[0012] The first heat exchanger is connected to the air supply device, the second heat exchanger and the cooling tower through pipelines, the first medium is heat-exchanged with the high-temperature steam in the first heat exchanger to become a first high-temperature medium, and the first high-temperature medium enters the second heat exchanger through the pipeline;

[0013] The second heat exchanger is connected to the cooling tower and the second-stage heat exchange device through a pipeline, the first high-temperature medium releases heat in the second heat exchanger to heat the second medium to become the second high-temperature medium, and the first high-temperature medium that loses heat enters the cooling tower;

[0014] The cooling tower is used to cool the first high-temperature medium that has lost heat to become the first medium, and supply the first medium to the first heat exchanger.

[0015] Specifically, the first-order heat exchange device further includes: a medium pump, which is arranged on a pipeline between the cooling tower and the first heat exchanger and is used to pump the first medium in the cooling tower to the first heat exchanger.

[0016] Specifically, the second-stage heat exchange device includes: a compressor and a third heat exchanger;

[0017] The compressor is connected to the second heat exchanger and the third heat exchanger through pipelines, and is used to compress the second high-temperature medium to increase the pressure and temperature of the second high-temperature medium to become a third high-temperature medium;

[0018] The third heat exchanger is connected to the second heat exchanger, the return water heater and the heating network heating system through a pipeline. The third high-temperature medium and the return water of the heating network heating system are heat-exchanged in the third heater to heat the return water of the heating network. The heated return water of the heating network enters the return water heater, and the third high-temperature medium that loses heat becomes the second medium again and enters the second heat exchanger.

[0019] Specifically, the second-stage heat exchange device further includes: a throttle valve, which is arranged on the pipeline between the third heat exchanger and the second heat exchanger, and is used to adjust the flow rate of the second medium flowing through the pipeline between the third heat exchanger and the second heat exchanger.

[0020] Specifically, the waste heat recovery cogeneration system also includes: a steam control component, which is arranged on the connecting pipe between the heat network heater and the gas supply device, and is used to control the flow rate of high-temperature steam flowing through the connecting pipe between the heat network heater and the gas supply device.

[0021] Specifically, the control component includes: a control valve, a regulator and a detector;

[0022] The detector is arranged on the connecting pipe between the heating network heater and the gas supply device, is connected to the controller signal, and is used to detect the flow rate of high-temperature steam flowing through the connecting pipe between the heating network heater and the gas supply device;

[0023] The regulator is used to send a corresponding control signal according to the flow rate of the high-temperature steam;

[0024] The control valve is arranged on the connecting pipe between the heat network heater and the gas supply device, and is connected to the regulator signal, and is used to adjust the opening of the control valve according to the control signal to control the flow rate of high-temperature steam flowing through the connecting pipe between the heat network heater and the gas supply device.

[0025] Specifically, the second medium is a refrigerant.

[0026] In the waste heat recovery cogeneration system provided by the utility model, the first medium exchanges heat with the high-temperature steam in the first-order heat exchange device, so that the first medium is heated to become the first high-temperature medium, the first high-temperature medium releases heat to heat the second medium in the second-order heat exchange device to become the second high-temperature medium, the first high-temperature medium that has lost heat becomes the first medium again and circulates in the first-order heat exchange device, the second high-temperature medium is compressed in the second-order heat exchange device to increase the temperature and pressure to become the third high-temperature medium, the third high-temperature medium exchanges heat with the heat network return water of the heat network heating system, so that the heat network return water is heated, thereby providing heating for users, and the third high-temperature medium that has lost heat becomes the second medium again and circulates in the second-order heat exchange device. Through the waste heat recovery cogeneration system provided by the utility model, the heat of the high-temperature steam can be fully utilized, solving the problem that the waste heat of steam in the power generation process of the thermal power unit in the prior art cannot be effectively utilized.

[0027] Other features and advantages of the embodiments of the present invention will be described in detail in the subsequent specific implementation section. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] The accompanying drawings are used to provide a further understanding of the embodiments of the present utility model and constitute a part of the specification. Together with the following specific implementations, they are used to explain the embodiments of the present utility model, but do not constitute a limitation on the embodiments of the present utility model. In the accompanying drawings:

[0029] Figure 1 It is a schematic diagram of the layout of the waste heat recovery cogeneration system provided in an embodiment of the utility model.

[0030] Description of Reference Numerals

[0031] 1-air supply device; 2-first-order heat exchange device; 3-second-order heat exchange device; 4-heat network heater; 5-return water heater; 6-steam control component; 7-generator; 21-first heat exchanger; 22-second heat exchanger; 23-cooling tower; 24-medium pump; 31-compressor; 32-third heat exchanger; 33-throttle valve. DETAILED DESCRIPTION

[0032] The specific implementation of the embodiment of the utility model is described in detail below in conjunction with the accompanying drawings. It should be understood that the specific implementation described here is only used to illustrate and explain the embodiment of the utility model, and is not used to limit the embodiment of the utility model.

[0033] Figure 1 This is a schematic diagram of the layout of the waste heat recovery cogeneration system. Figure 1 As shown, the utility model provides a waste heat recovery cogeneration system, the waste heat recovery cogeneration system comprising:

[0034] The gas supply device 1 is connected to the first-stage heat exchange device 2 through a pipeline, and is used to provide high-temperature steam to the first-stage heat exchange device 2;

[0035] The first-order heat exchange device 2 is connected to the second-order heat exchange device 3 through a pipeline. A first medium circulates inside the first-order heat exchange device 2. The first medium exchanges heat with high-temperature steam to become a first high-temperature medium. The first high-temperature medium can heat the second medium flowing in the second-order heat exchange device 3 to become a second high-temperature medium by releasing heat. The first high-temperature medium that loses heat in the first-order heat exchange device 2 becomes the first medium again.

[0036] The second-order heat exchange device 3 is connected to the heat network heating system through a pipeline. A second medium circulates inside the second-order heat exchange device 3. The second medium absorbs the heat released by the first high-temperature medium to become the second high-temperature medium. The second high-temperature medium is heated and pressurized by the second-order heat exchange device 3 to become the third high-temperature medium. The third high-temperature medium exchanges heat with the heat network return water of the heat network heating system in the second-order heat exchange device 3 to heat the heat network return water. The third high-temperature medium that loses heat in the second-order heat exchange device 3 becomes the second medium again.

[0037] The waste heat recovery cogeneration system provided by the utility model provides high-temperature steam to the first-order heat exchange device 2 through an air supply device 1. The air supply device 1 is a steam turbine. The high-temperature steam exchanges heat with the first medium in the first-order heat exchange device 2, so that the first medium absorbs the heat of the high-temperature steam to become the first high-temperature medium. The first high-temperature medium releases heat to heat the second medium in the second-order heat exchange device 3 to become the second high-temperature medium. After being compressed by the second-order heat exchange device 3, the temperature and pressure of the second high-temperature medium are increased again to become the third high-temperature medium. The heat is released by the third high-temperature medium to heat the heat network return water of the heat network heating system, so that the heat of the high-temperature steam provided by the air supply device 1 is fully utilized, which solves the problem that the waste heat of steam in the power generation process of the thermal power unit in the prior art cannot be effectively utilized.

[0038] In order to better utilize the heat of the high-temperature steam of the gas supply device 1, the waste heat recovery cogeneration system also includes: a heat network heater 4, which is connected to the gas supply device 1 and the heat network heating system through a pipeline and is used to absorb the heat in the high-temperature steam to heat the heat network return water in the heat network heating system.

[0039] The waste heat recovery cogeneration system also includes: a return water heater 5, which is connected to the heat network heater 4, the second-order heat exchange device 3 and the heat network heating system through a pipeline, and is used to heat the heat network return water of the heat network heating system, and secondary heat the heat network return water heated by the second-order heat exchange device 3 and the heat network heater 4.

[0040] like Figure 1As shown, a heat network heater 4 is provided to be connected with the gas supply device 1 through a pipeline, and air is extracted from the gas supply device 1 and sent to the heat network heater 4 through the pipeline, and the high-temperature steam exchanges heat with the heat network return water of the heat network heating system entering the heat network heater 4, thereby heating the heat network return water, and the heated heat network return water enters the return water heater 5 and is heated again by the return water heater 5, thereby reducing the energy consumption of the return water heater 5, and the return water heater 5 is connected with the heat network heating system through a pipeline, and can directly heat the heat network return water of the heat network heating system to provide heating for users.

[0041] In one embodiment, Figure 1 As shown, the air supply device 1 is a steam turbine, and the first-stage heat exchange device 2 includes: a first heat exchanger 21, a second heat exchanger 22 and a cooling tower 23;

[0042] The first heat exchanger 21 is connected to the air supply device 1, the second heat exchanger 23 and the cooling tower 23 through pipelines. The first medium is heat-exchanged with the high-temperature steam in the first heat exchanger 21 to become the first high-temperature medium. The first high-temperature medium enters the second heat exchanger 22 through the pipeline.

[0043] The second heat exchanger 22 is connected to the cooling tower 23 and the second-stage heat exchange device 3 through a pipeline. The first high-temperature medium releases heat in the second heat exchanger 22 to heat the second medium to become the second high-temperature medium. The first high-temperature medium that loses heat enters the cooling tower 23.

[0044] The cooling tower 23 is used to cool the first high-temperature medium that has lost heat into a first medium and supply the first medium to the first heat exchanger 21 .

[0045] The first-order heat exchange device 2 further includes: a medium pump 24 , which is disposed on a pipeline between the cooling tower 23 and the first heat exchanger 21 and is used to pump the first medium in the cooling tower 23 to the first heat exchanger 21 .

[0046] The second-stage heat exchange device 3 includes: a compressor 31 and a third heat exchanger 32;

[0047] The compressor 31 is connected to the second heat exchanger 22 and the third heat exchanger 32 through pipelines, and is used to compress the second high-temperature medium to increase the pressure and temperature of the second high-temperature medium to become a third high-temperature medium;

[0048] The third heat exchanger 32 is connected to the second heat exchanger 22, the return water heater 5 and the heating network system through a pipeline. The third high temperature medium and the return water of the heating network system are heat exchanged in the third heater 32 to heat the return water of the heating network. The heated return water of the heating network enters the return water heater 5, and the third high temperature medium that loses heat becomes the second medium again and enters the second heat exchanger 22.

[0049] The second-stage heat exchange device 3 further includes: a throttle valve 33 , which is arranged on the pipeline between the third heat exchanger 32 and the second heat exchanger 22 and is used to adjust the flow rate of the second medium flowing through the pipeline between the third heat exchanger 32 and the second heat exchanger 22 .

[0050] The gas supply device 1 provides steam to the generator 7 for generating electricity. The first heat exchanger 21 is a condenser, and the second heat exchanger 22 is an evaporator. The gas supply device 1 is connected to the first heat exchanger 21 through a pipeline, and the first heat exchanger 21 is connected to the second heat exchanger 22 and the cooling tower 23 through a pipeline. The first medium in the cooling tower 23 is pumped into the first heat exchanger 21 through a medium pump 24 to exchange heat with the high-temperature steam. The first medium is circulating water. After the heat exchange with the high-temperature steam, the temperature of the first medium rises to become the first high-temperature medium. The first high-temperature medium enters the second heat exchanger 22 through a pipeline between the first heat exchanger 21 and the second heat exchanger 22. The first high-temperature medium releases heat in the second heat exchanger 22 to exchange heat with the second medium. The first high-temperature medium that loses heat enters the cooling tower 23 through a pipeline between the second heat exchanger 22 and the cooling tower 23. After being cooled by the cooling tower 23, it becomes the first medium again. In this way, the first medium circulates in the first heat exchanger 21, the second heat exchanger 22 and the cooling tower 23.

[0051] The compressor 31 is connected to the second heat exchanger 22 and the third heat exchanger 32 through a pipeline. The third heat exchanger 32 is connected to the second heat exchanger 22 through a pipeline. The third heat exchanger 32 is a condenser. The second medium is a refrigerant. The refrigerant is preferably R134a and R410a. The second medium flows through the second heat exchanger 22 through the pipeline between the third heat exchanger 32 and the second heat exchanger 22. The second medium flowing through the second heat exchanger 22 exchanges heat with the first high-temperature medium. The second medium absorbs the heat of the first high-temperature medium to become the second high-temperature medium. The refrigerant absorbs the heat of the first high-temperature medium and vaporizes to become the gaseous second high-temperature medium. The second high-temperature medium is then passed through the compressor 31 and the second heat exchanger 22. The second high temperature medium enters the compressor 31 through the pipeline between the compressor 31 and the third heat exchanger 22. After being compressed by the compressor 31, the temperature and pressure of the second high temperature medium are increased again to become the third high temperature medium. The compressor 31 can be powered by the generator 7. The third high temperature medium enters the third heat exchanger 32 through the pipeline between the compressor 31 and the third heat exchanger 32, and exchanges heat with the hot network return water of the hot network heating system that also enters the third heat exchanger 32, thereby heating the hot network return water. The third high temperature medium that loses heat in the third heat exchanger 32 becomes the second medium, and enters the second heat exchanger 22 through the pipeline between the third heat exchanger 32 and the second heat exchanger 22, and continues to exchange heat with the first high temperature medium later.

[0052] In order to accurately control the amount of steam extracted from the gas supply device 1 and avoid excessive steam extraction affecting the power generation of the generator 7, the waste heat recovery cogeneration system also includes: a steam control component 6, which is arranged on the connecting pipe between the heat network heater 4 and the gas supply device 1, and is used to adjust the flow rate of high-temperature steam flowing through the connecting pipe between the heat network heater 4 and the gas supply device 1.

[0053] The regulating component 6 includes: a regulating valve, a regulator and a detector;

[0054] The detector is arranged on the connecting pipe between the heating network heater 4 and the gas supply device 1, and is connected to the controller signal, and is used to detect the flow rate of high-temperature steam flowing through the connecting pipe between the heating network heater 4 and the gas supply device 1;

[0055] The regulator is used to send a corresponding control signal according to the flow rate of the high-temperature steam;

[0056] The control valve is arranged on the connecting pipe between the heat network heater 4 and the gas supply device 1, and is connected to the regulator signal, and is used to adjust the opening of the control valve according to the control signal to adjust the flow rate of high-temperature steam flowing through the connecting pipe between the heat network heater 4 and the gas supply device 1.

[0057] By real-time detection of the flow rate of high-temperature steam in the pipeline between the gas supply device 1 and the heat network heater 4, the regulator generates and sends a corresponding control signal to the control valve according to the flow rate of high-temperature steam. The control valve adjusts the valve core opening according to the control signal to control the flow rate of high-temperature steam and avoid excessive steam extraction from the gas supply device 1.

[0058] In the waste heat recovery cogeneration system provided by the utility model, the first medium exchanges heat with the high-temperature steam in the first-order heat exchange device, so that the first medium is heated to become the first high-temperature medium, the first high-temperature medium releases heat to heat the second medium in the second-order heat exchange device to become the second high-temperature medium, the first high-temperature medium that has lost heat becomes the first medium again and circulates in the first-order heat exchange device, the second high-temperature medium is compressed in the second-order heat exchange device to increase the temperature and pressure to become the third high-temperature medium, the third high-temperature medium exchanges heat with the heat network return water of the heat network heating system, so that the heat network return water is heated, thereby providing heating for users, and the third high-temperature medium that has lost heat becomes the second medium again and circulates in the second-order heat exchange device. Through the waste heat recovery cogeneration system provided by the utility model, the heat of the high-temperature steam can be fully utilized, solving the problem that the waste heat of steam in the power generation process of the thermal power unit in the prior art cannot be effectively utilized.

[0059] The optional implementation modes of the embodiments of the utility model are described in detail above in conjunction with the accompanying drawings. However, the embodiments of the utility model are not limited to the specific details in the above implementation modes. Within the technical concept of the embodiments of the utility model, the technical scheme of the embodiments of the utility model can be subjected to various simple modifications, and these simple modifications all belong to the protection scope of the embodiments of the utility model.

[0060] It should also be noted that the various specific technical features described in the above specific embodiments can be combined in any suitable manner without contradiction. To avoid unnecessary repetition, the embodiments of the utility model will not further describe various possible combinations.

[0061] In addition, various implementations of the embodiments of the present utility model can also be arbitrarily combined, as long as they do not violate the concept of the embodiments of the present utility model, they should also be regarded as the contents disclosed in the embodiments of the present utility model.

Claims

1. A waste heat recovery cogeneration system, characterized in that: The waste heat recovery cogeneration system comprises: The gas supply device (1) is connected to the first-stage heat exchange device (2) through a pipeline and is used to provide high-temperature steam to the first-stage heat exchange device (2); The first-stage heat exchange device (2) is connected to the second-stage heat exchange device (3) through a pipeline. A first medium circulates inside the first-stage heat exchange device (2). The first medium exchanges heat with high-temperature steam to become a first high-temperature medium. The first high-temperature medium can heat a second medium flowing in the second-stage heat exchange device (3) to become a second high-temperature medium by releasing heat. The first high-temperature medium that loses heat in the first-stage heat exchange device (2) becomes the first medium again. The second-order heat exchange device (3) is connected to the heat network heating system through a pipeline. A second medium circulates inside the second-order heat exchange device (3). The second medium absorbs heat released by the first high-temperature medium to become a second high-temperature medium. The second high-temperature medium is heated and pressurized by the second-order heat exchange device (3) to become a third high-temperature medium. The third high-temperature medium exchanges heat with the heat network return water of the heat network heating system in the second-order heat exchange device (3) to heat the heat network return water. The third high-temperature medium that loses heat in the second-order heat exchange device (3) becomes the second medium again.

2. The waste heat recovery cogeneration system according to claim 1, characterized in that: The waste heat recovery cogeneration system also includes: a heat network heater (4), which is connected to the gas supply device (1) and the heat network heating system through a pipeline and is used to absorb heat from high-temperature steam to heat the heat network return water of the heat network heating system.

3. The waste heat recovery cogeneration system according to claim 2, characterized in that: The waste heat recovery cogeneration system further comprises: a return water heater (5), which is connected to the heat network heater (4), the second-stage heat exchange device (3) and the heat network heating system through pipelines, and is used to heat the heat network return water of the heat network heating system, and to secondary heat the heat network return water after being heated by the second-stage heat exchange device (3) and the heat network heater (4).

4. The waste heat recovery cogeneration system according to claim 3 is characterized in that: The first-stage heat exchange device (2) comprises: a first heat exchanger (21), a second heat exchanger (22) and a cooling tower (23); The first heat exchanger (21) is connected to the air supply device (1), the second heat exchanger (22) and the cooling tower (23) through pipelines; the first medium is heat-exchanged with the high-temperature steam in the first heat exchanger (21) to become a first high-temperature medium; and the first high-temperature medium enters the second heat exchanger (22) through the pipeline; The second heat exchanger (22) is connected to the cooling tower (23) and the second-stage heat exchange device (3) through a pipeline, the first high-temperature medium releases heat in the second heat exchanger (22) to heat the second medium to become a second high-temperature medium, and the first high-temperature medium that loses heat enters the cooling tower (23); The cooling tower (23) is used to cool the first high-temperature medium that has lost heat to become the first medium, and supply the first medium to the first heat exchanger (21).

5. The waste heat recovery cogeneration system according to claim 4, characterized in that: The first-stage heat exchange device (2) further comprises: a medium pump (24), which is arranged on a pipeline between the cooling tower (23) and the first heat exchanger (21) and is used to pump the first medium in the cooling tower (23) to the first heat exchanger (21).

6. The waste heat recovery cogeneration system according to claim 4, characterized in that: The second-stage heat exchange device (3) comprises: a compressor (31) and a third heat exchanger (32); The compressor (31) is connected to the second heat exchanger (22) and the third heat exchanger (32) through pipelines, and is used to compress the second high-temperature medium to increase the pressure and temperature of the second high-temperature medium to become a third high-temperature medium; The third heat exchanger (32) is connected to the second heat exchanger (22), the return water heater (5) and the heating network heating system through a pipeline. The third high-temperature medium and the return water of the heating network heating system are heat-exchanged in the third heat exchanger (32) to heat the return water of the heating network. The heated return water of the heating network enters the return water heater (5). The third high-temperature medium that loses heat becomes the second medium again and enters the second heat exchanger (22).

7. The waste heat recovery cogeneration system according to claim 6, characterized in that: The second-stage heat exchange device (3) further comprises: a throttle valve (33) arranged on the pipeline between the third heat exchanger (32) and the second heat exchanger (22), and used for adjusting the flow rate of the second medium flowing through the pipeline between the third heat exchanger (32) and the second heat exchanger (22).

8. The waste heat recovery cogeneration system according to claim 2, characterized in that: The waste heat recovery cogeneration system also includes: a steam control component (6), which is arranged on the connecting pipe between the heat network heater (4) and the gas supply device (1), and is used to control the flow rate of high-temperature steam flowing through the connecting pipe between the heat network heater (4) and the gas supply device (1).

9. The waste heat recovery cogeneration system according to claim 8, characterized in that: The steam control component (6) comprises: a control valve, a controller and a detector; The detector is arranged on the connecting pipe between the heating network heater (4) and the gas supply device (1), is connected to the controller signal, and is used to detect the flow rate of high-temperature steam flowing through the connecting pipe between the heating network heater (4) and the gas supply device (1); The regulator is used to send a corresponding control signal according to the flow rate of the high-temperature steam; The control valve is arranged on the connecting pipe between the heating network heater (4) and the gas supply device (1), and is connected to the regulator signal, and is used to adjust the opening of the control valve according to the control signal to control the flow of high-temperature steam flowing through the connecting pipe between the heating network heater (4) and the gas supply device (1).

10. The waste heat recovery cogeneration system according to claim 1, characterized in that: The second medium is a refrigerant.

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