Low-nox emission flue gas waste heat multi-cogeneration device and process

Abstract

The application discloses a kind of low NOx emission's flue gas waste heat multi-supply equipment and process in the technical field of environmental protection equipment, comprising: heat pump, denitration device and heat exchanger, the flue gas waste heat multi-supply equipment further includes refrigerating unit, ejector, turbine generator and high-pressure evaporator;The present application is embedded in the existing flue gas waste heat heating system by absorption refrigerating unit, utilizes the waste heat of high-temperature flue gas to drive absorption refrigerating unit, and special working substance is used to absorb and desorb again to pressurize after liquefaction to produce finished product liquid ammonia, compared with pressurization after liquefaction by electric compressor, greatly save electric energy, and it has important strategic significance to realize energy saving and emission reduction.

Description

Technical Field

[0001] This invention relates to the field of environmental protection equipment, specifically to a low-NOx emission flue gas waste heat combined heat and power equipment and process. Background Technology

[0002] Compared to coal combustion, natural gas exhibits virtually zero sulfide pollution and only about 50% of nitrogen oxide levels, around 100 mg / m³. Therefore, using natural gas as an energy source offers unparalleled advantages over other resources. However, from an environmental protection perspective, NOx emissions, a key pollutant controlled after natural gas combustion, still fall short of expectations. Therefore, while researching waste heat recovery and utilization from gas-fired boilers to improve thermal energy efficiency, further reducing NOx levels in flue gas to meet the latest air pollution control emission standards is of paramount importance. For example, publication number CN1065... The publicly disclosed document 68117A, a low-NOx emission flue gas waste heat heating system, outlines a scheme to reduce NOx content in flue gas and improve thermal energy utilization. However, this equipment has certain drawbacks in use. The destination of the ammonia produced by its denitrification unit is problematic. Besides converting the ammonia into other products through downstream processes, the destination of the ammonia itself is also an issue. As the denitrification unit continues to operate, the amount of ammonia produced will increase, and this ammonia is generally in a low-pressure state. The storage and transportation costs of low-pressure ammonia are high. The traditional approach is to liquefy the low-pressure ammonia by pressurizing it with an electric compressor, but the compressor consumes a huge amount of electricity. Summary of the Invention

[0003] The purpose of this invention is to provide a low-NOx emission flue gas waste heat combined heat and power equipment and process, which solves the problems of certain defects in the use of existing equipment.

[0004] The present invention achieves the above objectives through the following technical solution: a low NOx emission flue gas waste heat multi-generation equipment, comprising: a heat pump, a denitrification device and a heat exchanger, wherein the flue gas waste heat multi-generation equipment further comprises a refrigeration unit, an ejector, a turbine generator and a high-pressure evaporator;

[0005] The refrigeration unit is driven by the heat pump and the high-temperature flue gas from the outside to absorb the ammonia gas produced by the denitrification device and produce liquid ammonia after condensation. The high-pressure evaporator uses the heat generated by the heat pump to heat part of the liquid ammonia produced by the refrigeration unit, so that it is vaporized to drive the turbine generator to generate electricity. The ejector is used to use the gaseous ammonia used by the turbine generator as the ejector source to introduce the gaseous ammonia produced by the denitrification device into the refrigeration unit for absorption.

[0006] Preferably, the refrigeration unit includes a generator, a condenser, an evaporator, an absorber, a solution pump, a pressure reducing valve, and an expansion valve.

[0007] Preferably, the ejector is used to use gaseous ammonia from the turbine generator as an ejector source to introduce gaseous ammonia generated by the denitrification unit and the evaporator into the absorber.

[0008] Preferably, the circulating water outlet of the condenser and the circulating water inlet of the absorber are both connected to the circulating water pipeline of the heat exchanger;

[0009] The circulating water outlet of the absorber is connected to the circulating water inlet of the condenser.

[0010] Preferably, the chiller is used instead of the generator, condenser, evaporator and absorber. The chiller and the high-pressure evaporator are both fixed tube sheet heat exchangers whose main structure consists of end caps, tube box sections, tube sheets, heat exchange tubes and shell.

[0011] Preferably, the chiller is provided with a partition, which is used to divide the inner cavity of the chiller into an absorption cavity, an evaporation cavity, a condensation cavity, and a generation cavity.

[0012] Preferably, the high-pressure evaporator is mounted on top of the chiller via a support plate.

[0013] Preferably, the absorption chamber, evaporation chamber, generation chamber and high-pressure evaporator are all equipped with spray components.

[0014] Preferably, a low-NOx emission flue gas waste heat combined heat and power process, utilizing the aforementioned low-NOx emission flue gas waste heat combined heat and power equipment, includes the following steps:

[0015] The high-temperature flue gas generated by the heat pump combustion and the high-temperature flue gas generated by the gas boiler are combined and then enter the denitrification device for treatment. The low-pressure ammonia gas generated enters the absorption chamber through the ejector and is absorbed.

[0016] The high-temperature flue gas, after being treated by the denitrification device, enters the generation chamber, heats the high-pressure rich liquid, and produces high-pressure gaseous ammonia. The high-pressure gaseous ammonia enters the condensation chamber and is cooled by circulating water into high-pressure liquid ammonia. The high-pressure liquid ammonia is divided into three paths: the first path is discharged, the second path enters the evaporation chamber, and the third path enters the high-pressure evaporator.

[0017] The heat generated by the heat pump combustion heats the liquid ammonia in the high-pressure evaporator, causing it to vaporize and enter the turbine generator to generate electricity. The gaseous ammonia after the turbine generator is used enters the absorption chamber through the ejector and is absorbed.

[0018] A low-NOx emission flue gas waste heat combined heat and power process, which also utilizes the aforementioned low-NOx emission flue gas waste heat combined heat and power equipment, includes the following steps:

[0019] The high-temperature flue gas generated by the heat pump combustion and the high-temperature flue gas generated by the gas boiler are combined and then enter the denitrification device for treatment. The low-pressure ammonia gas generated enters the absorber through the ejector and is absorbed.

[0020] The high-temperature flue gas after being treated by the denitrification device enters the generator, heats the high-pressure rich liquid, and produces high-pressure gaseous ammonia. The high-pressure gaseous ammonia enters the condenser and is cooled by circulating water into high-pressure liquid ammonia. The high-pressure liquid ammonia is divided into three paths: the first path is discharged, the second path enters the evaporator, and the third path enters the high-pressure evaporator.

[0021] The heat generated by the heat pump combustion heats the liquid ammonia in the high-pressure evaporator, causing it to vaporize and enter the turbine generator to generate electricity. The gaseous ammonia after use by the turbine generator enters the absorber through the ejector and is absorbed.

[0022] The beneficial effects of this invention are as follows:

[0023] 1. By embedding an absorption chiller unit into the existing flue gas waste heat heating system, the waste heat of the high-temperature flue gas drives the absorption chiller unit. A special working fluid (such as TC working fluid or water) is used to absorb the low-pressure ammonia gas generated in the denitrification unit, and then desorb and pressurize it again to produce finished liquid ammonia. Compared with liquefaction by pressurization using an electric compressor, this method greatly saves electricity and has important strategic significance for achieving energy conservation and emission reduction. In addition, the storage and transportation of liquid ammonia is more convenient than that of gaseous ammonia, saving storage and transportation costs. Furthermore, the liquid ammonia after thermal pressurization and liquefaction can be used for refrigeration and power generation, in addition to selling finished liquid ammonia. This expands the application scenarios of the original system and enables it to have the function of combined cooling, heating and power, maximizing the economic benefits of the system.

[0024] 2. The ejector uses medium-pressure exhaust ammonia from the turbine generator to eject low-pressure ammonia from the evaporator and low-pressure ammonia generated from the denitrification unit, turning them into medium-pressure ammonia that enters the absorber, thereby enhancing the absorber's absorption efficiency and improving the system's working efficiency.

[0025] 3. The circulating water used for cooling the absorber and condenser is introduced into the heat pump as a low-temperature heat source, recovering the low-grade heat of the circulating water in the refrigeration unit, reducing energy consumption and improving COP. Attached Figure Description

[0026] Figure 1 This is a schematic diagram of the flue gas waste heat multi-generation equipment of the present invention;

[0027] Figure 2 This is a schematic diagram of the connection structure between the integrated unit and the denitrification device of the present invention;

[0028] Figure 3 This is a cross-sectional view of the integrated unit of the present invention;

[0029] Figure 4 For the present invention Figure 3 Schematic diagram of EE direction;

[0030] Figure 5 For the present invention Figure 3 Schematic diagram of the CC direction;

[0031] Figure 6 For the present invention Figure 3 Schematic diagram of the DD direction.

[0032] In the diagram: 1. Heat pump; 2. Denitrification device; 3. Heat exchanger; 4. Switch valve; 5. Ejector; 6. Turbine generator; 7. High-pressure evaporator; 8. Generator; 9. Condenser; 10. Evaporator; 11. Absorber; 12. Solution pump; 13. Pressure reducing valve; 14. Expansion valve; 15. Chiller; 151. Absorption chamber; 152. Evaporation chamber; 153. Condensation chamber; 154. Generator chamber; 155. Baffle. Detailed Implementation

[0033] The present application will now be described in further detail with reference to the accompanying drawings. It should be noted that the following specific embodiments are only used to further illustrate the present application and should not be construed as limiting the scope of protection of the present application. Those skilled in the art can make some non-essential improvements and adjustments to the present application based on the above application content.

[0034] Example 1

[0035] Please see Figure 1 A low-NOx emission flue gas waste heat multi-generation equipment includes: a heat pump 1, a denitrification device 2 and a heat exchanger 3. The flue gas waste heat multi-generation equipment also includes a refrigeration unit, an ejector 5, a turbine generator 6 and a high-pressure evaporator 7.

[0036] The refrigeration unit includes a generator 8, a condenser 9, an evaporator 10, an absorber 11, a solution pump 12, a pressure reducing valve 13, and an expansion valve 14.

[0037] Please see Figure 1The high-temperature flue gas outlet of heat pump 1 is connected to the flue gas pipe of the gas boiler, which is connected to the inlet of denitrification device 2. The ammonia outlet of denitrification device 2 is connected to ejector 5. The high-temperature flue gas outlet of denitrification device 2 is connected to the heat source inlet of generator 8. The heat source outlet of generator 8 is connected to heat exchanger 3 (heat exchanger 3 includes a housing, a circulating water pipe connected to the housing, and nozzles installed inside the housing; the nozzles are connected to one end of the circulating water pipe, and the other end of the circulating water pipe is connected to the housing). A section of the circulating water pipe of heat exchanger 3 is located in heat pump 1 (so that the circulating water pipe of heat exchanger 3 exchanges heat with heat pump 1). The circulating water pipe of heat exchanger 3 is connected to the circulating water inlet of absorber 11 and the circulating water outlet of condenser 9, respectively. The heat transfer agent inlet and outlet branches of heat pump 1 are both connected to high-pressure evaporator 7 (so that part of the heat transfer agent discharged from heat pump 1 enters high-pressure evaporator 7, and the heat pump 1's...). A switching valve 4 is provided between the heat transfer fluid outlet and the high-pressure evaporator 7. The outlet of the high-pressure evaporator 7 is connected to the turbine generator 6. The outlet of the turbine generator 6 is connected to the ejector 5. The ejector 5 is connected to the ammonia outlet of the evaporator 10. The outlet of the ejector 5 is connected to the ammonia inlet of the absorber 11. The circulating water outlet of the absorber 11 is connected to the circulating water inlet of the condenser 9. The rich liquid outlet of the absorber 11 is connected to the rich liquid inlet of the generator 8 through the solution pump 12. The lean liquid inlet of the absorber 11 is connected to the lean liquid outlet of the generator 8 through the pressure reducing valve 13. The high-pressure ammonia outlet of the generator 8 is connected to the high-pressure ammonia inlet of the condenser 9. The liquid ammonia of the condenser 9 has three outlets: one outlet is connected to the liquid ammonia inlet of the evaporator 10 through the expansion valve 14, another outlet is connected to the high-pressure evaporator 7, and the last outlet is used to connect to the equipment for collecting liquid ammonia.

[0038] A low-NOx emission flue gas waste heat combined heat and power process includes the following steps:

[0039] Natural gas and other gases enter the generator of heat pump 1 through the inlet pipe and are burned. The high-temperature flue gas generated by combustion enters the flue gas pipe of the gas boiler through the outlet of heat pump 1 and the flue gas pipe. After merging with the flue gas of the gas boiler in the flue gas pipe, it enters the denitrification device 2 for denitrification treatment. The low-pressure ammonia gas generated by denitrification is ejected by ejector 5 and becomes secondary medium-pressure ammonia gas, which then enters the absorber 11 and is absorbed.

[0040] The high-temperature flue gas, after being treated by the denitrification device 2, first enters the generator 8, where it heats the high-pressure rich liquid delivered from the absorber 11 by the solution pump 12. This causes most of the refrigerant (ammonia) in the high-pressure rich liquid to be desorbed, becoming high-pressure gaseous ammonia that enters the condenser 9 and is cooled by circulating water into high-pressure liquid ammonia. The high-pressure liquid ammonia is divided into three paths: one path is sold as finished liquid ammonia; another path is depressurized by the expansion valve 14 into low-pressure liquid ammonia and enters the evaporator 10; and the last path is entered into the high-pressure evaporator 7.

[0041] The high-temperature flue gas from generator 8 enters heat exchanger 3 and exchanges heat with circulating water. The flue gas temperature is reduced to below 30°C and discharged from the exhaust pipe. The circulating water carries the latent heat and sensible heat of water vapor recovered from the flue gas into the evaporator of heat pump 1 as a low-temperature heat source. Together with the high-temperature flue gas generated by the combustion of gas, it heats the heat transfer fluid in the heating pipeline. The heat transfer fluid is divided into two paths: one path supplies heat to the outside, and the other path enters the high-pressure evaporator 7 through the switch valve 4.

[0042] The low-pressure liquid ammonia entering the evaporator 10 absorbs heat from the refrigerant and vaporizes into low-pressure gaseous ammonia. The high-pressure liquid ammonia entering the high-pressure evaporator 7 absorbs heat from the heat pump 1 and vaporizes into high-pressure gaseous ammonia. The high-pressure gaseous ammonia drives the turbine generator 6 to generate electricity, which is converted into medium-pressure exhaust gaseous ammonia. The medium-pressure exhaust gaseous ammonia is used as an ejector source and enters the ejector 5. At the same time, it ejects the low-pressure gaseous ammonia from the evaporator 10 and the low-pressure ammonia generated from the denitrification device 2, which are converted into secondary medium-pressure gaseous ammonia and enter the absorber 11.

[0043] The high-pressure lean liquid remaining in the generator 8 after the generation process is depressurized into a low-pressure lean liquid by the pressure reducing valve 13 and then enters the absorber 11, where it is mixed and absorbed with the secondary medium-pressure ammonia gas coming out of the ejector 5 to become a low-pressure rich liquid. The low-pressure rich liquid is pressurized by the solution pump 12 and then sent back to the generator 8 to continue the cycle.

[0044] It should be noted that the circulating water from heat pump 1 is divided into two paths: one path goes to heat exchanger 3, and the other path enters absorber 11 and condenser 9 in sequence, which are used to cool absorber 11 and condenser 9 respectively. The circulating water from condenser 9 merges with the circulating water from heat exchanger 3 and then returns to the evaporator of heat pump 1 as a low-temperature heat source, where it is absorbed and cooled, and then recycled.

[0045] Example 2

[0046] As a further optimization of Example 1, please refer to Figure 2 , Figure 3 , Figure 4 , Figure 5 and Figure 6 The generator 8, condenser 9, evaporator 10 and absorber 11 are replaced by a chiller 15. Both the chiller 15 and the high-pressure evaporator 7 are fixed tube sheet heat exchangers whose main structure consists of end caps, tube box sections, tube sheets, heat exchange tubes and shell. The chiller 15 has a partition 155 in its inner cavity, which is used to divide the inner cavity of the chiller 15 into an absorption cavity 151, an evaporation cavity 152, a condensation cavity 153 and a generator cavity 154.

[0047] The absorption chamber 151 is equipped with a spray assembly (including a spray pipe and a nozzle) inside its shell. The absorption chamber 151 is equipped with a low-pressure lean liquid inlet, a medium-pressure ammonia gas inlet, and a low-pressure rich liquid outlet. The low-pressure lean liquid inlet is connected to the spray pipe and the pressure reducing valve 13 through a pipe. The low-pressure rich liquid outlet is connected to the solution pump 12 through a pipe. The left and right pipe boxes of the absorption chamber 151 are respectively equipped with a circulating water inlet and outlet.

[0048] The evaporator chamber 152 is equipped with a spray assembly (including a spray pipe and a nozzle) inside its shell. The evaporator chamber 152 is equipped with a low-pressure liquid ammonia inlet and a low-pressure gaseous ammonia outlet. The low-pressure liquid ammonia inlet is connected to the spray pipe and expansion valve 14 through a pipe. The low-pressure gaseous ammonia outlet is connected to the air inlet chamber of ejector 5 through a pipe. The left and right tube boxes of the evaporator chamber 152 are respectively equipped with a refrigerant inlet and outlet.

[0049] The shell of the condensing chamber 153 is provided with a high-pressure liquid ammonia outlet, which is connected to three outlet pipelines. One outlet is the pipeline for selling finished liquid ammonia, another outlet is connected to the expansion valve 14 through a pipeline, and the last outlet is connected to the shell-side inlet of the high-pressure evaporator 7 through a pipeline. The left and right tube boxes of the condensing chamber 153 are respectively provided with circulating water inlet and outlet. The circulating water inlet on the right tube box of the condensing chamber 153 is connected to the circulating water outlet on the right tube box of the absorption chamber 151 through a pipeline.

[0050] The shell of the generating chamber 154 is equipped with a spray assembly (including spray pipes and nozzles). The shell of the generating chamber 154 is equipped with a high-pressure rich liquid inlet and a high-pressure lean liquid outlet. The high-pressure rich liquid inlet is connected to the solution pump through a pipe, and the high-pressure lean liquid outlet is connected to the pressure reducing valve 13 through a pipe. The left and right pipe boxes of the generating chamber 154 are respectively equipped with high-temperature flue gas inlet and outlet, which are respectively connected to the denitrification device 2 and the heat exchanger 3.

[0051] The shell of the high-pressure evaporator 7 is equipped with a spray assembly (including spray pipes and nozzles). The shell is equipped with a high-pressure liquid ammonia inlet and a high-pressure gaseous ammonia outlet. The high-pressure gaseous ammonia outlet is connected to the inlet of the turbine generator 6 through a pipeline. The left and right tube boxes of the high-pressure evaporator 7 are respectively equipped with heat transfer fluid inlet and outlet, which are respectively connected to the heat transfer fluid inlet and outlet of the heat pump 1.

[0052] A through-hole is provided on the partition 155 inside the shell of the condensing chamber 153. The through-hole connects the inner cavity of the condensing chamber 153 with the inner cavity of the generating chamber 154, eliminating the need for pipes and reducing costs. A baffle plate is provided inside the through-hole to prevent liquid from passing through it.

[0053] In this embodiment, as a further optimization, please refer to... Figure 3 and Figure 4The high-pressure evaporator 7 is mounted on top of the chiller 15 via a support plate.

[0054] A low-NOx emission flue gas waste heat combined heat and power process includes the following steps:

[0055] Natural gas and other gases enter the generator of heat pump 1 through the inlet pipe and are burned. The high-temperature flue gas generated by combustion enters the flue gas pipe of the gas boiler through the outlet of heat pump 1 and the flue gas pipe. After merging with the flue gas of the gas boiler in the flue gas pipe, it enters the denitrification device 2 for denitrification treatment. The low-pressure ammonia gas generated by denitrification is ejected by ejector 5 and becomes secondary medium-pressure ammonia gas, which then enters the shell side of the absorption chamber 151.

[0056] The high-temperature flue gas, after being treated by the denitrification device 2, first enters the tube side of the generating chamber 154, where it heats the high-pressure rich liquid delivered from the absorption chamber 151 by the solution pump 12. This causes most of the refrigerant (ammonia) in the high-pressure rich liquid to be desorbed, becoming high-pressure gaseous ammonia. The high-pressure gaseous ammonia enters the shell side of the condensing chamber 153 through the baffle plate, where it is cooled by the circulating water in the tube side into high-pressure liquid ammonia. The high-pressure liquid ammonia is divided into three paths: one path is sold as finished liquid ammonia; another path is depressurized by the expansion valve 14 into low-pressure liquid ammonia and enters the shell side of the evaporation chamber 152; and the last path is entered into the shell side of the high-pressure evaporator 7.

[0057] The high-temperature flue gas from the tube side of the generating chamber 154 enters the heat exchanger 3 and exchanges heat with the circulating water. The flue gas temperature is reduced to below 30°C and discharged from the exhaust pipe. The circulating water carries the latent heat and sensible heat of water vapor recovered from the flue gas and enters the evaporator of the heat pump 1 as a low-temperature heat source. Together with the high-temperature flue gas generated by the combustion of the gas, it heats the heat transfer agent in the heating pipeline. The heat transfer agent is divided into two paths: one path supplies heat to the outside, and the other path enters the high-pressure evaporator 7 through the switch valve 4.

[0058] The low-pressure liquid ammonia entering the evaporation chamber 152 absorbs heat from the refrigerant and vaporizes into low-pressure gaseous ammonia. The high-pressure liquid ammonia entering the shell side of the high-pressure evaporator 7 absorbs heat from the heat pump 1 and vaporizes into high-pressure gaseous ammonia. The high-pressure gaseous ammonia drives the turbine generator 6 to generate electricity, which is converted into medium-pressure exhaust gaseous ammonia. The medium-pressure exhaust gaseous ammonia is used as an ejector source and enters the ejector 5. At the same time, it ejects the low-pressure gaseous ammonia from the evaporation chamber 152 and the low-pressure ammonia generated from the denitrification device 2, which are converted into secondary medium-pressure gaseous ammonia and enter the absorption chamber 151.

[0059] In the shell side of the generating chamber 154, the high-pressure lean liquid remaining after the generating process is depressurized into a low-pressure lean liquid by the pressure reducing valve 13 and then enters the shell side of the absorption chamber 151. It is mixed and absorbed with the secondary medium-pressure ammonia gas coming out from the ejector 5 to become a low-pressure rich liquid. The low-pressure rich liquid is pressurized by the solution pump 12 and then sent back to the shell side of the generating chamber 154 to continue the cycle.

[0060] It should be noted that the circulating water from heat pump 1 is divided into two paths: one path goes to heat exchanger 3, and the other path enters absorption chamber 151 and condensation chamber 153 in sequence, which are used to cool absorption chamber 151 and condensation chamber 153 respectively. The circulating water from the tube side of condensation chamber 153 merges with the circulating water from heat exchanger 3 and then returns to the evaporator of heat pump 1 as a low-temperature heat source, where it is absorbed and cooled, and then recycled.

[0061] It should also be noted that integrating the chiller 15, high-pressure evaporator 7, turbine generator 6, ejector 5, solution pump 12, pressure reducing valve 13 and expansion valve 14 into an integrated unit reduces the cost of equipment and piping, greatly reduces the unit's footprint, and facilitates skid-mounted installation of the unit.

[0062] The embodiments described above are merely examples of several implementations of the present invention, and while the descriptions are relatively specific and detailed, they should not be construed as limiting the scope of the present invention. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of the present invention, and these modifications and improvements all fall within the scope of protection of the present invention.

Claims

1. A low-NOx emission flue gas waste heat combined heat and power system, comprising: The heat pump (1), denitrification device (2) and heat exchanger (3) are characterized in that the flue gas waste heat multi-generation equipment further includes a refrigeration unit, an ejector (5), a turbine generator (6) and a high-pressure evaporator (7). The refrigeration unit is driven by the heat pump (1) and the heat of the high-temperature flue gas in the outside to absorb the ammonia gas produced by the denitrification device (2) and produce liquid ammonia after condensation. The high-pressure evaporator (7) uses the heat generated by the heat pump (1) to heat part of the liquid ammonia produced by the refrigeration unit and vaporize it to drive the turbine generator (6) to generate electricity. The ejector (5) is used to use the gaseous ammonia used by the turbine generator (6) as the ejector source to introduce the gaseous ammonia produced by the denitrification device (2) into the refrigeration unit for absorption. The refrigeration unit includes a generator (8), a condenser (9), an evaporator (10), an absorber (11), a solution pump (12), a pressure reducing valve (13), and an expansion valve (14). The high-temperature flue gas outlet of the heat pump (1) is connected to the flue gas pipe of the gas boiler, which is connected to the inlet of the denitrification device (2). The ammonia outlet of the denitrification device (2) is connected to the ejector (5). The high-temperature flue gas outlet of the denitrification device (2) is connected to the heat source inlet of the generator (8). The heat source outlet of the generator (8) is connected to the heat exchanger (3). A section of the circulating water pipe of the heat exchanger (3) is located in the heat pump (1). The circulating water pipe of the heat exchanger (3) is connected to the circulating water inlet of the absorber (11) and the circulating water outlet of the condenser (9). The heat transfer agent inlet and outlet branches of the heat pump (1) are connected to the high-pressure evaporator (7). The outlet of the high-pressure evaporator (7) is connected to the turbine generator (6). The outlet of the turbine generator (6) is connected to the ejector (5). (5) Connected to the ammonia outlet of the evaporator (10), the outlet of the ejector (5) is connected to the ammonia inlet of the absorber (11), the circulating water outlet of the absorber (11) is connected to the circulating water inlet of the condenser (9), the rich liquid outlet of the absorber (11) is connected to the rich liquid inlet of the generator (8) through the solution pump (12), the lean liquid inlet of the absorber (11) is connected to the lean liquid outlet of the generator (8) through the pressure reducing valve (13), the high pressure ammonia outlet of the generator (8) is connected to the high pressure ammonia inlet of the condenser (9), the liquid ammonia of the condenser (9) has three outlets, one outlet is connected to the liquid ammonia inlet of the evaporator (10) through the expansion valve (14), another outlet is connected to the high pressure evaporator (7), and the last outlet is used to connect to the equipment for collecting liquid ammonia.

2. The low-NOx emission flue gas waste heat combined heat and power equipment according to claim 1, characterized in that, The ejector (5) is used to use the gaseous ammonia used by the turbine generator (6) as an ejector source to introduce the gaseous ammonia generated by the denitrification device (2) and the evaporator (10) into the absorber (11).

3. The low-NOx emission flue gas waste heat combined heat and power equipment according to claim 1, characterized in that, The circulating water outlet of the condenser (9) and the circulating water inlet of the absorber (11) are both connected to the circulating water pipe of the heat exchanger (3). The circulating water outlet of the absorber (11) is connected to the circulating water inlet of the condenser (9).

4. A low-NOx emission flue gas waste heat combined heat and power system according to claim 1, characterized in that, The chiller (15) is used in place of the generator (8), condenser (9), evaporator (10) and absorber (11). The chiller (15) and the high-pressure evaporator (7) are both fixed tube sheet heat exchangers whose main structure consists of a head, tube box section, tube sheet, heat exchange tube and shell.

5. A low-NOx emission flue gas waste heat combined heat and power system according to claim 4, characterized in that, The chiller (15) is provided with a partition (155) for dividing the inner cavity of the chiller (15) into an absorption cavity (151), an evaporation cavity (152), a condensation cavity (153), and a generation cavity (154).

6. A low-NOx emission flue gas waste heat combined heat and power system according to claim 4, characterized in that, The high-pressure evaporator (7) is mounted on top of the chiller (15) via a support plate.

7. A low-NOx emission flue gas waste heat combined heat and power (CHP) device according to claim 5, characterized in that, Spraying components are provided in the absorption chamber (151), evaporation chamber (152), generation chamber (154) and high-pressure evaporator (7).

8. A low-NOx emission flue gas waste heat combined heat and power process, utilizing a low-NOx emission flue gas waste heat combined heat and power equipment as described in any one of claims 2-3, characterized in that, Includes the following steps: The high-temperature flue gas generated by the heat pump (1) and the high-temperature flue gas generated by the gas boiler are combined and then enter the denitrification device (2) for treatment. The low-pressure ammonia gas generated enters the absorber (11) through the ejector (5) and is absorbed. After being treated by the denitrification device (2), the high-temperature flue gas enters the generator (8) to heat the high-pressure rich liquid and produce high-pressure gaseous ammonia. The high-pressure gaseous ammonia enters the condenser (9) and is cooled by circulating water into high-pressure liquid ammonia. The high-pressure liquid ammonia is divided into three paths: the first path is discharged, the second path enters the evaporator (10), and the third path enters the high-pressure evaporator (7). The heat generated by the heat pump (1) heats the liquid ammonia in the high-pressure evaporator (7), causing it to vaporize and enter the turbine generator (6) to generate electricity. The gaseous ammonia after use by the turbine generator (6) enters the absorber (11) through the ejector (5) and is absorbed.

9. A low-NOx emission flue gas waste heat combined heat and power process, utilizing a low-NOx emission flue gas waste heat combined heat and power equipment as described in any one of claims 5-7, characterized in that, Includes the following steps: The high-temperature flue gas generated by the heat pump (1) and the high-temperature flue gas generated by the gas boiler are combined and then enter the denitrification device (2) for treatment. The low-pressure ammonia gas generated enters the absorption chamber (151) through the ejector (5) and is absorbed. The high-temperature flue gas after being treated by the denitrification device (2) enters the generating chamber (154) to heat the high-pressure rich liquid and produce high-pressure gaseous ammonia. The high-pressure gaseous ammonia enters the condensing chamber (153) and is cooled by circulating water into high-pressure liquid ammonia. The high-pressure liquid ammonia is divided into three paths: the first path is discharged, the second path enters the evaporation chamber (152), and the third path enters the high-pressure evaporator (7). The heat generated by the heat pump (1) heats the liquid ammonia in the high-pressure evaporator (7), causing it to vaporize and enter the turbine generator (6) to generate electricity. The gaseous ammonia after being used by the turbine generator (6) enters the absorption chamber (151) through the ejector (5) and is absorbed.

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