Flue gas waste heat cogeneration coupled absorption heat pump power supply system

Abstract

The present disclosure provides a flue gas waste heat combined heat and power coupled absorption heat pump energy supply system, which comprises a flue gas waste heat recovery subsystem 101, a waste heat power generation subsystem 102 and an absorption heat pump subsystem 103, wherein the flue gas waste heat recovery subsystem 101 is used for recovering heat energy in flue gas, the waste heat power generation subsystem 102 is used for converting heat energy in flue gas into electric energy, and the absorption heat pump subsystem 103 is used for recovering heat energy in air. Based on the system of the present disclosure, the recovery effect of flue gas waste heat can be effectively improved, and the energy utilization rate can be improved.

Description

Technical Field

[0001] This disclosure relates to the field of clean energy technology, specifically to a flue gas waste heat cogeneration coupled absorption heat pump energy supply system. Background Technology

[0002] Currently, urban heating systems generally use centralized heating methods with coal-fired power plants as the basic heat source. With the advancement and implementation of clean heating plans, some small coal-fired power plants and coal-fired boilers have been gradually shut down. However, due to the influence of coal prices and the flexibility of combined heat and power, large power plants do not have sufficient heating capacity to take on this part of the heating area, resulting in a decline in the heating effect and safety of urban areas.

[0003] As a major category of clean energy, waste heat from flue gas has gradually received widespread attention and development in recent years. In the past, the main methods for recovering and utilizing waste heat from flue gas were for heating. However, since flue gas contains a large amount of sulfur, direct use would cause serious corrosion to equipment and have a severe impact on the environment. Therefore, it is necessary to desulfurize first and then recover the waste heat. However, the temperature of the tail flue gas after desulfurization is too low, and the recovery capacity and quantity are limited.

[0004] Among related technologies, the waste heat recovery effect of flue gas from coal-fired cogeneration units is not good, and the energy utilization efficiency is low. Summary of the Invention

[0005] This disclosure aims to at least partially address one of the technical problems in the related art.

[0006] Therefore, the purpose of this disclosure is to propose a flue gas waste heat cogeneration coupled absorption heat pump energy supply system, which can effectively improve the recovery effect of flue gas waste heat and improve energy utilization.

[0007] To achieve the above objectives, the flue gas waste heat cogeneration coupled absorption heat pump energy supply system proposed in the first aspect of this disclosure includes: a flue gas waste heat recovery subsystem 101, a waste heat power generation system 102, and an absorption heat pump subsystem 103; wherein,

[0008] The flue gas waste heat recovery subsystem 101 is used to recover heat energy from the flue gas;

[0009] The waste heat to electricity system 102 is used to convert the heat energy in the flue gas into electrical energy;

[0010] The absorption heat pump subsystem 103 is used to recover heat energy from the air.

[0011] The flue gas waste heat cogeneration coupled absorption heat pump energy supply system disclosed herein includes: a flue gas waste heat recovery subsystem 101, a waste heat power generation system 102, and an absorption heat pump subsystem 103. The flue gas waste heat recovery subsystem 101 is used to recover heat energy from the flue gas; the waste heat power generation system 102 is used to convert the heat energy from the flue gas into electrical energy; and the absorption heat pump subsystem 103 is used to recover heat energy from the air. Based on the system disclosed herein, the recovery effect of flue gas waste heat can be effectively improved, and the energy utilization rate can be increased.

[0012] Additional aspects and advantages of this disclosure will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of this disclosure. Attached Figure Description

[0013] The above and / or additional aspects and advantages of this disclosure will become apparent and readily understood from the following description of the embodiments taken in conjunction with the accompanying drawings, in which:

[0014] Figure 1 This is a schematic diagram of the structure of a flue gas waste heat cogeneration coupled absorption heat pump energy supply system according to an embodiment of this disclosure;

[0015] Figure 2 This is a schematic diagram of the structure of a flue gas waste heat cogeneration coupled absorption heat pump energy supply system proposed in another embodiment of this disclosure. Detailed Implementation

[0016] Embodiments of this disclosure are described in detail below, examples of which are illustrated in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and are used only to explain this disclosure, and should not be construed as limiting this disclosure. Rather, embodiments of this disclosure include all variations, modifications, and equivalents falling within the spirit and scope of the appended claims.

[0017] Figure 1 This is a schematic diagram of the structure of a flue gas waste heat cogeneration coupled absorption heat pump energy supply system proposed in one embodiment of this disclosure.

[0018] like Figure 1 As shown, the flue gas waste heat cogeneration coupled absorption heat pump energy supply system 10 includes: a flue gas waste heat recovery subsystem 101, a waste heat power generation system 102, and an absorption heat pump subsystem 103; wherein,

[0019] Flue gas waste heat recovery subsystem 101 is used to recover heat energy from flue gas;

[0020] Waste heat generation system 102 is used to convert the heat energy in flue gas into electrical energy;

[0021] Absorption heat pump subsystem 103 is used to recover heat energy from the air.

[0022] It is understandable that a lot of flue gas may be generated during power generation or industrial production, and this flue gas may contain a lot of heat. If this flue gas is discharged directly without treatment, it may have a significant adverse impact on the environment and result in a waste of heat resources.

[0023] In this embodiment of the disclosure, the waste heat recovery subsystem 101 can absorb flue gas from any source (such as a coal-fired boiler or a metallurgical furnace) and absorb and utilize the heat in the flue gas, thereby fully improving the utilization rate of flue gas heat.

[0024] In this embodiment of the disclosure, after the heat energy in the flue gas is recovered based on the flue gas waste heat recovery subsystem 101, since the heat energy is not convenient to store and use, the heat energy in the flue gas can be converted into electrical energy based on the waste heat power generation system 102, thereby improving energy utilization efficiency and facilitating transmission and distribution.

[0025] It is understandable that in personalized application scenarios, in addition to the heat energy in flue gas, the air in the application environment may also have high heat energy due to the influence of the production process. These low-to-medium grade heat energies in the air may also have economic value. Therefore, these low-to-medium grade heat energies can be absorbed and utilized based on the absorption heat pump subsystem 103 in this embodiment of the present disclosure.

[0026] Based on the system disclosed herein, the recovery effect of waste heat from flue gas can be effectively improved, thereby increasing energy utilization.

[0027] In some embodiments of this disclosure, such as Figure 2 As shown, Figure 2 This is a schematic diagram of a flue gas waste heat cogeneration coupled absorption heat pump energy supply system according to another embodiment of this disclosure. The flue gas waste heat recovery subsystem 101 includes: a desulfurization tower 1011, a desulfurization slurry circulation pump 1012, a desulfurization tower nozzle 1013, a spray tower 1014, and a spray water circulation pump 1015. The flue gas waste heat recovery subsystem 101 is also used for:

[0028] In the desulfurization tower 1011, the desulfurization slurry is pumped by the desulfurization slurry circulation pump 1012 to the desulfurization tower nozzle 1013 to spray the flue gas to obtain saturated wet flue gas, and then the saturated wet flue gas is transported to the spray tower 1014.

[0029] The saturated wet flue gas is first sprayed in spray tower 1014 to obtain high-temperature spray water.

[0030] The high-temperature spray water is transported to the waste heat evaporator 1021 by the spray water circulation pump 1015, whereby the high-temperature spray water is converted into low-temperature spray water after passing through the waste heat evaporator 1021.

[0031] The desulfurization slurry refers to the liquid pre-prepared in the desulfurization tower 1011 for desulfurizing flue gas. For example, the desulfurization slurry can be prepared based on quicklime, or it can be prepared based on any other components; there are no restrictions on this.

[0032] It is understood that the flue gas recovered and utilized in this embodiment may contain a large amount of sulfur. If used directly without treatment, it may corrode the equipment and potentially impact the environment. Therefore, the system proposed in this embodiment is equipped with a desulfurization tower 1011 for desulfurizing the flue gas.

[0033] In some embodiments of this disclosure, such as Figure 2 As shown, the flue gas waste heat recovery subsystem 101 also includes: a spray tower nozzle 1016 and a drain valve 1017; wherein, the flue gas waste heat recovery subsystem 101 is also used for:

[0034] Low-temperature spray water is pumped to spray tower nozzle 1016 to spray the saturated wet flue gas a second time to obtain the first condensate.

[0035] The first condensate is transported to the desulfurization tower 1011 via the drain valve 1017.

[0036] It is understandable that saturated wet flue gas has the characteristic that the saturated moisture content will decrease as the temperature decreases. By setting up a spray tower 1014 after the desulfurization tower to further spray and cool the flue gas at the outlet of the desulfurization tower, the water vapor carrying a large amount of latent heat can be condensed, thereby recovering a large amount of low-grade waste heat. At the same time, it can also recover high-purity condensate, reducing the amount of water consumed by the desulfurization tower.

[0037] In some embodiments of this disclosure, such as Figure 2 As shown, the waste heat power generation system 102 includes: a waste heat evaporator 1021, a turbine 1022, and a generator 1023; wherein, the waste heat power generation system 102 is also used for:

[0038] The internal working fluid of the waste heat evaporator 1021 absorbs the heat of the high-temperature spray water and converts it into superheated steam.

[0039] The turbine 1022 is driven by superheated steam to perform work, which in turn drives the generator 1023 to generate electricity.

[0040] In this embodiment of the present disclosure, the internal working fluid of the waste heat evaporator 1021 can be R245fa or R22, which have a lower saturation temperature under the same pressure. Of course, any other possible substance can also be used as the internal working fluid of the waste heat evaporator 1021, and there is no limitation on this.

[0041] Among them, a turbine 1022 refers to a machine that can convert the energy contained in a fluid medium into mechanical energy. For example, compressors, steam turbines, turbines, flue gas turbines, and expanders can all be called turbines.

[0042] In this embodiment of the disclosure, the working fluid of the turbine 1022 can be either gas or liquid. A turbine using water as the working fluid is called a water turbine, one using steam is called a steam turbine, and one using natural gas is called a gas turbine, also known as a gas turbine.

[0043] In other words, the waste heat power generation system 102 proposed in this embodiment can convert the thermal energy in the flue gas into electrical energy based on the waste heat evaporator 1021, the turbine 1022 and the generator 1023.

[0044] In some embodiments of this disclosure, such as Figure 2 As shown, the waste heat generation system 102 also includes: a condenser heat exchanger 1024, a liquid storage tank 1025, and a working fluid circulation pump 1026; wherein, the waste heat generation system 102 is also used for:

[0045] The exhaust steam from the outlet of the turbine 1022 is controlled to enter the condenser heat exchanger 1024 to heat the return water of the heating network;

[0046] The condensing working fluid at the outlet of the condensing heat exchanger 1024 is controlled to enter the liquid storage tank 1025;

[0047] The working fluid circulation pump 1026 is controlled to draw the condensate from the liquid storage tank 1025.

[0048] Among them, the working fluid circulation pump 1026 can provide circulation power and initial pressure for the working fluid.

[0049] In other words, in this embodiment of the present disclosure, the turbine exhaust steam can enter the condenser heat exchanger 1024 to heat the return water of the heating network circulation, and then the condensate enters the storage tank 1025 to ensure the normal circulation balance of the working fluid. Thus, the waste heat to electricity system 102 proposed in this embodiment of the present disclosure can heat the return water of the heating network based on the exhaust steam from the turbine 1022, so as to achieve primary heating of the return water of the heating network, which can greatly improve the energy utilization rate of the system.

[0050] In some embodiments of this disclosure, such as Figure 2 As shown, the waste heat generation electronic system 102 further includes: a throttling bypass; wherein, the waste heat generation electronic system 102 is also used for:

[0051] Obtain information on the differences in user-side thermal and electrical load demand;

[0052] When the difference information meets the preset conditions, the throttling bypass is controlled to be in the open state;

[0053] The condensate extracted from the storage tank 1025 is transported to the generator 1031 via a throttling bypass after being depressurized by superheated steam.

[0054] The condensing working fluid processed by generator 1031 is transported to condensing heat exchanger 1024.

[0055] Among these, the difference information can be used to indicate the differences in user-side thermal and electrical load demand.

[0056] Among these, preset conditions refer to conditions configured in advance based on the differences in user-side heat and electricity load demand. For example, preset conditions could indicate that there are significant differences in user-side heat and electricity load demand.

[0057] In other words, in this embodiment of the present disclosure, the throttling bypass can be opened when the user-side thermoelectric load demand is significantly different, and a portion of the superheated working fluid steam is depressurized and sent to the absorption heat pump generator 1031 as a driving heat source, and then mixed with the working fluid in the main loop and enters the condensing heat exchanger 1024.

[0058] In some embodiments of this disclosure, such as Figure 2 As shown, the throttling bypass includes: a first ball valve 1027, a check valve 1028, a throttling valve 1029, and a second ball valve 10210; wherein,

[0059] The first ball valve 1027, check valve 1028 and throttle valve 1029 are arranged on the working fluid inlet side of the generator 1031;

[0060] The second ball valve 10210 is located on the working fluid outlet side of the generator 1031.

[0061] Therefore, the flue gas waste heat cogeneration coupled absorption heat pump energy supply system proposed in this embodiment can adjust the flow ratio between the steam in the main loop for power generation and the secondary loop for driving the absorption heat pump based on the first ball valve 1027, check valve 1028, throttle valve 1029 and the second ball valve 10210, so as to effectively improve the practicality of the system.

[0062] In some embodiments of this disclosure, such as Figure 2 As shown, the absorption heat pump subsystem 103 includes: a generator 1031 and a condenser 1032; wherein, the absorption heat pump subsystem 103 is further used for:

[0063] The internal circulating working fluid of the control generator 1031 absorbs heat and converts it into first water vapor and first solution;

[0064] The first water vapor is controlled to enter the condenser 1032 and be converted into the second condensate. The condenser 1032 is used to heat the return water of the heating network.

[0065] The internal circulating working fluid of the control generator 1031 can be a lithium bromide solution. The corresponding first solution can be a concentrated lithium bromide solution.

[0066] That is to say, in this embodiment of the present disclosure, the absorption heat pump subsystem 103 can perform secondary heating of the heat network return water based on the generator 1031 and the condenser 1032.

[0067] In some embodiments of this disclosure, such as Figure 2 As shown, the absorption heat pump subsystem 103 further includes: a first expansion valve 1033, an evaporator 1034, an absorber 1035, a solution circulation pump 1036, and a second expansion valve 1037; wherein, the absorption heat pump subsystem 103 is also used for:

[0068] The second condensate is depressurized by the first expansion valve 1033 and then enters the evaporator 1034 to be converted into second water vapor;

[0069] The first solution is depressurized by the second expansion valve 1037 and then enters the absorber 1035, wherein the absorber 1035 is used to heat the return water of the heating network.

[0070] In absorber 1035, the second water vapor is controlled to mix with the first solution to release heat and form a second solution;

[0071] The second solution is pumped to the generator 1031 by the solution circulation pump 1036.

[0072] That is to say, in this embodiment of the present disclosure, the absorption heat pump subsystem 103 can also heat the return water of the heating network based on the first expansion valve 1033, the evaporator 1034, the absorber 1035, the solution circulation pump 1036 and the second expansion valve 1037, and realize the internal circulation of the internal circulating working fluid of the generator 1031.

[0073] In some embodiments of this disclosure, such as Figure 2 As shown, the absorption heat pump subsystem 103 further includes: a solution heat exchanger 1038; wherein, the absorption heat pump subsystem 103 is also used for:

[0074] The solution heat exchanger 1038 controls the heat exchange between the first solution and the second solution.

[0075] The second solution can be a dilute lithium bromide solution.

[0076] Based on the above embodiments, the flue gas waste heat cogeneration coupled absorption heat pump energy supply system proposed in this disclosure consists of three subsystems connected in series: a flue gas waste heat recovery subsystem 101, a waste heat power generation system 102, and an absorption heat pump subsystem 103.

[0077] The flue gas waste heat recovery subsystem 101 consists of a desulfurization tower 1011, a desulfurization slurry circulation pump 1012, desulfurization tower nozzles 1013, a spray tower 1014, a spray water circulation pump 1015, spray tower nozzles 1016, and a drain valve 1017. The flue gas is first sprayed with desulfurization slurry in the desulfurization tower 1011. The desulfurization slurry is then drawn out by the desulfurization slurry circulation pump 1012 and sprayed into the desulfurization tower nozzles 1013. Saturated wet flue gas from the outlet enters the spray tower 1014 and is sprayed and cooled. The spray water is pumped out by the spray water circulation pump 1015 to the waste heat evaporator 1021 to provide waste heat source, and then to the spray tower nozzle 1016 to spray the flue gas a second time. During the spraying process, additional condensate falls to the bottom of the tower. This part of the water can be used as makeup water for the desulfurization tower. The drain valve 1017 is opened to send the recovered water in the spray tower 1014 into the desulfurization tower 1011.

[0078] The waste heat power generation system 102 consists of a waste heat evaporator 1021, a turbine 1022, a generator 1023, a condenser heat exchanger 1024, a liquid storage tank 1025, a working fluid circulation pump 1026, and a throttling bypass. The throttling bypass consists of a first ball valve 1027, a check valve 1028, an electric throttling valve 1029, and a second ball valve 10210. The internal working fluid is evaporated into superheated steam by the waste heat evaporator 1021 and enters the turbine 1022 to expand and do work, driving the generator 1023. 23. The exhaust steam from the outlet enters the condenser heat exchanger 1024 to perform primary heating of the heat network return water. The outlet condensate enters the storage tank 1025. The working fluid circulation pump 1026 extracts the working fluid from the storage tank 1025 to form a circulation. The throttling bypass is opened when there is a large difference in the heat and power load demand on the user side. A portion of the superheated steam of the working fluid is depressurized and sent to the absorption heat pump generator 1031 as a driving heat source. Then it is mixed with the working fluid of the main loop and enters the condenser heat exchanger 1024.

[0079] The absorption heat pump subsystem 103 consists of a generator 1031, a condenser 1032, a first expansion valve 1033, an evaporator 1034, an absorber 1035, a lithium bromide circulating pump (solution circulating pump 1036), a second expansion valve 1037, and a solution heat exchanger 1038. In the generator 1031, a dilute lithium bromide solution is heated and decomposed into water vapor and a concentrated solution. The water vapor enters the condenser 1032 to heat the heating network water. The condensate is depressurized by the first expansion valve 1033 and then enters the evaporator 1034 to evaporate back into water vapor. The concentrated solution is depressurized by the second expansion valve 1037 and then flows back into the evaporator 1038. Heat is transferred to another dilute solution in heat exchanger 1038, and then falls into absorber 1035 to absorb and mix with water vapor from evaporator 1034 to release heat and form a dilute solution. Then it is pumped back to generator 1031 by solution pump 1036. During this process, it absorbs heat from another concentrated solution when passing through solution heat exchanger 1038. The return water of the heating network circulation is powered by the heating network circulation water pump and first enters the condenser heat exchanger 1024 for primary heating. Then it enters the absorber 1035 and condenser 1032 of the absorption heat pump for secondary heating. After meeting the user's water supply temperature requirements, it is used to supply heat to the outside.

[0080] Other embodiments of this disclosure will readily occur to those skilled in the art upon consideration of the specification and practice of the invention disclosed herein. This disclosure is intended to cover any variations, uses, or adaptations of this disclosure that follow the general principles of this disclosure and include common knowledge or customary techniques in the art not disclosed herein. The specification and examples are to be considered exemplary only, and the true scope and spirit of this disclosure are indicated by the following claims.

[0081] Based on the above embodiments, the flue gas waste heat cogeneration coupled absorption heat pump energy supply system proposed in this disclosure has at least the following advantages:

[0082] (1) Spraying saturated wet flue gas with a spray tower can recover the latent heat of water vapor in the flue gas and recover condensate at the same time, thereby improving the energy utilization efficiency of coal-fired thermal power units, reducing the amount of make-up water, and reducing the operating cost of the unit.

[0083] (2) Low-temperature steam generated by flue gas waste heat drives turbine power generation, transforming the recovered waste heat into higher-quality electricity, thus improving the form and level of waste heat utilization.

[0084] (3) The absorption heat pump is driven by low-temperature steam through a throttling bypass to recover low-grade heat energy in the air, improve the adjustability of the system's thermoelectric power output, significantly increase the system's load adaptability range, actively respond to user needs, further improve energy utilization, and reduce energy supply costs and pollutant emissions.

[0085] It is understood that in the operation of the flue gas waste heat cogeneration coupled absorption heat pump energy supply system proposed in this embodiment, the flue gas is first desulfurized by a desulfurization tower to become saturated wet flue gas. Then, the spray tower recovers the latent heat of water vapor contained in the flue gas through secondary cooling. This part of the waste heat is sent to the waste heat evaporator to generate superheated steam. The steam drives the turbine to do work, which drives the generator to generate electricity. The turbine exhaust steam enters the condenser heat exchanger to heat the return water of the heating network. Then, the condensate enters the storage tank to ensure the normal circulation balance of the working fluid. The booster pump is responsible for providing circulation power and initial pressure for the working fluid. The throttling bypass is used to adjust the flow ratio between the steam in the main loop of power generation and the secondary loop of driving the absorption heat pump. The internal circulating working fluid of the absorption heat pump is a lithium bromide solution, which recovers low-grade heat energy from the air to perform secondary heating of the heating network circulating water to meet the supply water temperature before supplying it to the heat users. The above combination can fully recover and utilize the waste heat of flue gas using new energy production technologies, generating electricity while providing heating for users. It improves energy utilization efficiency through combined heat and power, and at the same time, it combines absorption heat pumps to improve the system's heat-to-power ratio and flexibly adjust it to adapt to a wide range of user loads, greatly reducing energy supply costs and carbon emissions.

[0086] It should be understood that this disclosure is not limited to the precise structures described above and shown in the accompanying drawings, and various modifications and changes can be made without departing from its scope. The scope of this disclosure is limited only by the appended claims.

[0087] It should be noted that in the description of this disclosure, the terms "first," "second," etc., are used for descriptive purposes only and should not be construed as indicating or implying relative importance. Furthermore, in the description of this disclosure, unless otherwise stated, "a plurality of" means two or more.

[0088] Any process or method description in the flowchart or otherwise herein can be understood as representing a module, segment, or portion of code comprising one or more executable instructions for implementing a particular logical function or process, and the scope of preferred embodiments of this disclosure includes additional implementations in which functions may be performed not in the order shown or discussed, including substantially simultaneously or in reverse order depending on the function involved, as will be understood by those skilled in the art to which embodiments of this disclosure pertain.

[0089] It should be understood that various parts of this disclosure can be implemented using hardware, software, firmware, or a combination thereof. In the above embodiments, multiple steps or methods can be implemented using software or firmware stored in memory and executed by a suitable instruction execution system. For example, if implemented in hardware, as in another embodiment, it can be implemented using any one or a combination of the following techniques known in the art: discrete logic circuits having logic gates for implementing logical functions on data signals, application-specific integrated circuits (ASICs) having suitable combinational logic gates, programmable gate arrays (PGAs), field-programmable gate arrays (FPGAs), etc.

[0090] Those skilled in the art will understand that all or part of the steps of the methods in the above embodiments can be implemented by a program instructing related hardware. The program can be stored in a computer-readable storage medium, and when executed, the program includes one or a combination of the steps of the method embodiments.

[0091] Furthermore, the functional units in the various embodiments of this disclosure can be integrated into a processing module, or each unit can exist physically separately, or two or more units can be integrated into a module. The integrated module can be implemented in hardware or as a software functional module. If the integrated module is implemented as a software functional module and sold or used as an independent product, it can also be stored in a computer-readable storage medium.

[0092] The storage media mentioned above can be read-only memory, disk, or optical disk, etc.

[0093] In the description of this specification, references to terms such as "one embodiment," "some embodiments," "example," "specific example," or "some examples," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of this disclosure. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples.

[0094] Although embodiments of the present disclosure have been shown and described above, it is to be understood that the above embodiments are exemplary and should not be construed as limiting the present disclosure. Those skilled in the art can make changes, modifications, substitutions and variations to the above embodiments within the scope of the present disclosure.

Claims

1. A flue gas waste heat cogeneration coupled absorption heat pump energy supply system, characterized in that, The system includes: a flue gas waste heat recovery subsystem (101), a waste heat power generation system (102), and an absorption heat pump subsystem (103); wherein, The flue gas waste heat recovery subsystem (101) is used to recover heat energy from the flue gas; The waste heat to electricity system (102) is used to convert the thermal energy in the flue gas into electrical energy; The absorption heat pump subsystem (103) is used to recover heat energy from the air; The flue gas waste heat recovery subsystem (101) includes: a desulfurization tower (1011), a desulfurization slurry circulation pump (1012), a desulfurization tower nozzle (1013), a spray tower (1014), and a spray water circulation pump (1015); wherein, the flue gas waste heat recovery subsystem (101) is further used for: In the desulfurization tower (1011), the desulfurization slurry is pumped to the desulfurization tower nozzle (1013) by the desulfurization slurry circulation pump (1012) to spray the flue gas to obtain saturated wet flue gas, and the saturated wet flue gas is transported to the spray tower (1014). The saturated wet flue gas is sprayed for the first time in the spray tower (1014) to obtain high-temperature spray water; The high-temperature spray water is transported to the waste heat evaporator (1021) by the spray water circulation pump (1015), wherein the high-temperature spray water is converted into low-temperature spray water after passing through the waste heat evaporator (1021); The waste heat power generation system (102) includes: a waste heat evaporator (1021), a turbine (1022), and a generator (1023); the waste heat power generation system (102) is also used for: The internal working fluid of the waste heat evaporator (1021) is controlled to absorb the heat of the high-temperature spray water and convert it into superheated steam; The superheated steam drives the turbine (1022) to do work, thereby driving the generator (1023) to generate electricity; The waste heat generation system (102) further includes: a condenser heat exchanger (1024), a liquid storage tank (1025), and a working fluid circulation pump (1026); the waste heat generation system (102) is also used for: The exhaust steam from the turbine (1022) is controlled to enter the condenser heat exchanger (1024) to heat the return water of the heating network; The condensing working fluid at the outlet of the condensing heat exchanger (1024) is controlled to enter the liquid storage tank (1025). The working fluid circulation pump (1026) is controlled to draw the condensed working fluid from the storage tank (1025); The waste heat generation electronic system (102) further includes a throttling bypass; the waste heat generation electronic system (102) is also used for: Obtain information on the differences in user-side thermal and electrical load demand; When the difference information meets the preset conditions, the throttling bypass is controlled to be in the open state; The condensate drawn from the storage tank (1025) is transported to the generator (1031) via the throttling bypass after being depressurized by superheated steam. The condensate processed by the generator (1031) is transported to the condenser heat exchanger (1024). The absorption heat pump subsystem (103) includes a generator (1031) and a condenser (1032); the absorption heat pump subsystem (103) is also used for: The internal circulating working fluid of the generator (1031) absorbs heat and converts it into first water vapor and first solution; The first water vapor is controlled to enter the condenser (1032) and be converted into second condensate, wherein the condenser (1032) is used to heat the return water of the heating network; The absorption heat pump subsystem (103) further includes: a first expansion valve (1033), an evaporator (1034), an absorber (1035), a solution circulation pump (1036), and a second expansion valve (1037); wherein the absorption heat pump subsystem (103) is also used for: The second condensate is depressurized via the first expansion valve (1033) and then enters the evaporator (1034) to be converted into second water vapor; The first solution is depressurized via the second expansion valve (1037) and then enters the absorber (1035), wherein the absorber (1035) is used to heat the return water of the heating network. In the absorber (1035), the second water vapor is controlled to mix with the first solution to release heat and form a second solution; The second solution is pumped to the generator (1031) by the solution circulation pump (1036).

2. The system as described in claim 1, characterized in that, The flue gas waste heat recovery subsystem (101) further includes: a spray tower nozzle (1016) and a drain valve (1017); wherein, the flue gas waste heat recovery subsystem (101) is also used for: The low-temperature spray water is pumped to the spray tower nozzle (1016) to spray the saturated wet flue gas a second time, and the first condensate is obtained. The first condensate is transported to the desulfurization tower (1011) via the drain valve (1017).

3. The system as described in claim 1, characterized in that, The throttling bypass includes: a first ball valve (1027), a check valve (1028), a throttling valve (1029), and a second ball valve (10210); wherein, The first ball valve (1027), the check valve (1028), and the throttle valve (1029) are disposed on the working fluid inlet side of the generator (1031); The second ball valve (10210) is disposed on the working fluid outlet side of the generator (1031).

4. The system as described in claim 1, characterized in that, The absorption heat pump subsystem (103) further includes: a solution heat exchanger; wherein, the absorption heat pump subsystem (103) is also used for: The solution heat exchanger controls the heat exchange between the first solution and the second solution.

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