A gas generator set tail gas denitrification device

Abstract

The present invention is a tail gas denitration device for a gas generator set, and relates to the technical field of tail gas denitration equipment, including a protection frame, an SCR reactor, a steam generator, an electrostatic precipitator, and an FGD absorber are fixedly installed inside the protection frame, a first steam delivery pipe of the steam generator is connected to the SCR reactor, the first steam delivery pipe is connected to an ammonia delivery pipe, an outlet pipe of the SCR reactor is connected to the electrostatic precipitator, the electrostatic precipitator is connected to the FGD absorber, a second steam delivery pipe and a third steam delivery pipe of the steam generator are respectively connected to the electrostatic precipitator and the FGD absorber, and the FGD absorber is connected to a tail gas outlet pipe. The temperature environment of the tail gas circulating in the present invention is in a high temperature state, so that the tail gas can be in a high conversion efficiency in the overall denitration process, which can not only avoid the generation of a large number of by-products, and ensure that the denitration device can be carried out continuously with high efficiency, but also eliminate safety hazards and ensure the stability of the denitration device.

Description

Technical Field

[0001] The invention relates to the technical field of tail gas denitration equipment, and specifically discloses a mining screw machine drainer. Background Art

[0002] Gas-fired generator sets will produce a large amount of nitrogen oxides during operation. Nitrogen oxides are one of the main pollutants that cause air pollution. Nitrogen oxides can cause environmental problems such as acid rain, greenhouse effect, and ozone layer depletion, posing a serious threat to the human living environment. The concentration of nitrogen oxides produced by gas-fired generator sets during combustion is usually between 400-2000mg / m³. If denitrification treatment is not performed, it is difficult to meet national emission standards; therefore, denitrification treatment of gas-fired generator set exhaust is a relatively important exhaust emission treatment link.

[0003] Commonly used denitrification technologies include selective catalytic reduction and selective non-catalytic reduction. Selective catalytic reduction, also known as SCR technology, is currently the mainstream method for efficiently removing nitrogen oxides from exhaust gas. It reacts ammonia with NOx through a catalyst to generate nitrogen and water. It has the advantages of high denitrification efficiency, stable operation, and strong adaptability. The invention with application announcement number: CN118698324A discloses a new type of π-type boiler SCR denitrification device. This prior art can evenly mix the flue gas and ammonia by setting a guide plate in the flue through which the flue gas flows, thereby improving the denitrification efficiency. The design of the special angle on the guide plate; the invention with application announcement number: CN118634643A discloses a flue gas SCR denitrification device for cement kiln tail system. This prior art can fully mix ammonia water with the flue gas, and facilitate denitrification by increasing the mixing time.

[0004] In the above-disclosed prior art, nitrogen oxides in flue gas are removed by catalytic reduction reaction by mixing ammonia water with flue gas. In the actual production process, the catalytic reduction material needs to be in a relatively high temperature environment to ensure activity, usually between 300-400°C; after the tail gas enters the denitrification device, as the reaction proceeds, the tail gas temperature will gradually decrease, so that the tail gas in the second half of the denitrification device is difficult to achieve the predetermined conversion efficiency, and a large amount of by-product ammonia salts will be produced. The ammonia salts will adhere to the air flow pipe inside the denitrification device, thereby affecting the operation of the entire denitrification device, making it difficult for the denitrification device to maintain high efficiency and high stability for a long time; at the least, it will cause irreversible damage to the denitrification device, and at the worst, the pipeline will be blocked and leaked, bringing immeasurable losses to the enterprise. Summary of the invention

[0005] In view of the problems of poor stability and high potential safety hazards in current denitration devices, the present invention provides a denitration device for exhaust gas of a gas generator set.

[0006] To solve the above problems, the present invention provides the following technical solutions:

[0007] A gas generator set tail gas denitration device, comprising a protection frame, an SCR reactor is fixedly installed inside the protection frame, the top of the SCR reactor is connected to a tail gas inlet pipe for tail gas to enter, a steam generator is arranged on the side of the SCR reactor, a first steam delivery pipe is fixedly connected to the side of the steam generator, the first steam delivery pipe is connected to the SCR reactor, the first steam delivery pipe is connected to an ammonia delivery pipe, and an ammonia delivery valve connected to an ammonia evaporator is installed at the end of the ammonia delivery pipe; an electrostatic dust collector is fixedly installed inside the protection frame The outlet pipe of the SCR reactor is connected with the electrostatic precipitator, the top of the electrostatic precipitator is provided with an FGD absorber connected with the electrostatic precipitator, the top of the steam generator is respectively fixedly connected with a second steam delivery pipe and a third steam delivery pipe, the second steam delivery pipe is connected with the electrostatic precipitator, the third steam delivery pipe is connected with the FGD absorber, the top side of the FGD absorber is connected with an exhaust gas outlet pipe, the exhaust gas outlet pipe is connected with a condenser, and the condenser is provided with an exhaust pipe for exhaust gas discharge and a water outlet pipe for condensed water discharge.

[0008] Preferably, the ammonia delivery pipe is connected to an air inlet pipe, the air inlet pipe is connected to a blower, an air supply fan is rotatably installed on the side of the blower, a plurality of air filter cartridges are installed inside the blower, and the air filter cartridges are all connected to the air inlet pipe.

[0009] Preferably, a grid plate fixedly mounted on the side of the blower is provided on the outside of the air filter cartridge, and every two air filter cartridges are connected by a bend pipe, and the bend pipe is arranged on the outside of the blower, and each bend pipe is connected to a first manifold, and the first manifold is connected to the air inlet pipe.

[0010] Preferably, a mixer is fixedly installed at the confluence of the air inlet pipe and the ammonia delivery pipe, and a pressure buffer tank is provided on the ammonia delivery pipe.

[0011] Preferably, a fourth steam delivery pipe is connected to the top of the steam generator, and the fourth steam delivery pipe is communicated with the first steam delivery pipe.

[0012] Preferably, a first motor for driving is fixedly mounted on the top of the SCR reactor.

[0013] Preferably, a guide valve is installed on the gas outlet pipeline connecting the SCR reactor and the electrostatic precipitator, and a second motor is installed on the outer side of the guide valve.

[0014] Preferably, a third motor for accelerating the steam flow rate is installed on the pipeline of the third steam delivery pipe; a three-way pipe is fixedly installed at the end of the third steam delivery pipe, and the two outlet ends of the three-way pipe are connected to the FGD absorber.

[0015] Preferably, a fifth steam delivery pipe is fixedly connected to the side of the steam generator, the fifth steam delivery pipe is connected to the tail gas outlet pipe through a second manifold, and the second manifold is tightly connected to the inlet end of the condenser.

[0016] Preferably, the exhaust pipe is arranged horizontally, and the inlet end of the exhaust pipe is arranged on the side wall of the condenser; the water outlet pipe is arranged vertically, and the inlet end of the water outlet pipe is arranged on the bottom end surface of the condenser.

[0017] Compared with the prior art, the present invention has the following beneficial effects:

[0018] 1. The first steam delivery pipe in the present invention can make the ammonia gas introduced into the SCR reactor in a high temperature state, and continuously introduce high temperature water vapor into the electrostatic precipitator and the FGD absorber through the second steam delivery pipe and the third steam delivery pipe respectively, so that the exhaust gas circulation path and the reaction equipment are adapted to the high temperature environment of the exhaust gas reaction, and the impurities in the exhaust gas are further filtered through the condenser, so that the exhaust gas discharged by the device meets the emission standards. After the exhaust gas enters the overall device, as the reaction proceeds gradually, the temperature environment of the exhaust gas is in a high temperature state, so that the exhaust gas can be in a high conversion efficiency in the overall denitration process, which can not only avoid the generation of a large number of by-products, but also ensure that the denitration device can continue to operate with high efficiency, and at the same time eliminate safety hazards and ensure the stability of the denitration device;

[0019] 2. The elbow pipe in the present invention connects each air filter cartridge into an integrated structure, so that the air flowing through each air filter cartridge can be continuously converged in the first confluence pipe, thereby sending the air from the air inlet pipe to the ammonia delivery pipe, ensuring that the flow rate of the air inlet pipe meets the established requirements, and by setting the fourth steam delivery pipe, it is ensured that the ammonia temperature entering the SCR reactor meets the established standards. At the same time, by setting a pressure buffer tank, a pressure buffer space is provided for the ammonia delivery pipe, thereby avoiding structural damage to the pipeline caused by sudden pressure changes;

[0020] 3. The present invention can accelerate the circulation rate of exhaust gas and steam in the overall device by installing a third motor for accelerating the steam flow rate on the pipeline of the third steam delivery pipe, thereby improving the denitrification reaction rate of the overall device, and by setting a three-way pipe, the steam input in the FGD absorber is more uniform, avoiding space leakage, thereby improving the reaction rate of the FGD absorber, and therefore has a very broad application prospect. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] In order to more clearly illustrate the technical solution of the present invention, the following briefly introduces the drawings required for the description. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative work.

[0022] Figure 1 It is a schematic diagram of the overall structure of the device of the present invention;

[0023] Figure 2 It is a schematic diagram of the air inlet pipe arrangement structure of the present invention;

[0024] Figure 3 It is a schematic diagram of the structure of the first manifold of the present invention;

[0025] Figure 4 It is a schematic diagram of the structures of the second steam delivery pipe, the third steam delivery pipe and the fourth steam delivery pipe of the present invention;

[0026] Figure 5 It is a schematic diagram of the structure of the fifth steam delivery pipe of the present invention;

[0027] Figure 6 This is a schematic diagram of the installation structure of the diversion valve of the present invention;

[0028] In the figure: 1. protection frame, 2. SCR reactor, 3. tail gas inlet pipe, 4. steam generator, 5. first steam delivery pipe, 6. ammonia delivery pipe, 7. ammonia delivery valve, 8. electrostatic precipitator, 9. FGD absorber, 10. second steam delivery pipe, 11. third steam delivery pipe, 12. tail gas outlet pipe, 13. condenser, 14. exhaust pipe, 15. outlet pipe, 16. air inlet pipe, 17. blower, 18. air supply fan, 19. air filter cartridge, 20. grid plate, 21. elbow, 22. first manifold, 23. mixer, 24. pressure buffer tank, 25. fourth steam delivery pipe, 26. first motor, 27. diversion valve, 28. second motor, 29. third motor, 30. three-way pipe, 31. fifth steam delivery pipe, 32. second manifold. DETAILED DESCRIPTION

[0029] In order to make the purpose, features and advantages of the present invention more obvious and easy to understand, the technical scheme of the present invention will be clearly and completely described below in conjunction with the drawings in this specific embodiment. Obviously, the embodiments described below are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0030] This specific embodiment provides a gas generator set tail gas denitrification device, such as Figure 1-Figure 6 As shown; it includes a protection frame 1, in which an SCR reactor 2, a steam generator 4, an electrostatic precipitator 8, and an FGD absorber 9 are arranged; the protection frame 1 can provide protection and support structure for each of the above-mentioned equipment, thereby improving space utilization and protection safety. The SCR reactor 2 is the core equipment of the overall device. The top of the SCR reactor 2 is connected to a tail gas inlet pipe 3 for the entry of tail gas. The tail gas of the gas generator set can enter the SCR reactor 2 through the tail gas inlet pipe 3. The top of the SCR reactor 2 is also provided with a first motor 26, which is a driving component of the SCR reactor 2, thereby providing a continuous driving force for the SCR reactor 2.

[0031] The steam generator 4 is arranged at the side of the SCR reactor 2. The steam generator 4 can generate high-temperature steam. The steam generator 4 is connected to the SCR reactor 2 through the first steam delivery pipe 5. The high-temperature steam generated by the steam generator 4 can enter the interior of the SCR reactor 2 through the first steam delivery pipe 5. The first steam delivery pipe 5 is connected to an ammonia delivery pipe 6. The end of the ammonia delivery pipe 6 is equipped with an ammonia delivery valve 7 connected to an ammonia evaporator; the ammonia evaporator can generate ammonia gas with a certain temperature from ammonia water, and deliver the ammonia gas to the SCR reactor 2 through the ammonia delivery pipe 6, and make the ammonia gas and the high-temperature steam converge in the first steam delivery pipe 5, thereby increasing the initial temperature of the ammonia gas and the ambient temperature.

[0032] The ammonia delivery pipe 6 is connected to an air inlet pipe 16, and the air inlet pipe 16 is connected to a blower 17. An air supply fan 18 is rotatably installed on the inner side of the blower 17. The air supply fan 18 can blow external air into the inside of the blower 17. A plurality of air filter cartridges 19 are installed inside the blower 17. The surface of the air filter cartridge 19 is provided with holes for air entry. The inside of the air filter cartridge 19 is provided with a filter element for purifying air. The air filter cartridge 19 can purify the air flowing through the inside thereof; the outside of the air filter cartridge 19 is provided with a grid plate 20 fixedly installed on the side of the blower 17, and the grid plate 20 is arranged obliquely to prevent the air from flowing out of the air filter cartridge 19. Every two air filter cartridges 19 are connected by an elbow 21, and the elbow 21 is arranged on the outside of the blower 17. The elbow 21 connects each air filter cartridge 19 into an integrated structure. Each elbow 21 is connected to the first confluence pipe 22. The air flowing through each air filter cartridge 19 can be confluenced in the first confluence pipe 22. The first confluence pipe 22 is connected to the air inlet pipe 16, so that the air is sent from the air inlet pipe 16 to the ammonia delivery pipe 6. In addition, a fourth steam delivery pipe 25 is connected to the top of the steam generator 4, and the fourth steam delivery pipe 25 is connected to the first steam delivery pipe 5, so as to ensure that the ammonia temperature in the first steam delivery pipe 5 meets the established standard.

[0033] Wherein, a mixer 23 is fixedly installed at the confluence of the air inlet pipe 16 and the ammonia delivery pipe 6. The mixer 23 can be used to mix ammonia and air, which can increase the air flow velocity in the ammonia delivery pipe 6 on the one hand, and make the ammonia concentration in the ammonia delivery pipe 6 reach the standard value required by the SCR reactor 2 on the other hand. In addition, a pressure buffer tank 24 is arranged on the ammonia delivery pipe 6; the pressure buffer tank 24 can provide a pressure buffer space for the ammonia delivery pipe 6, thereby avoiding structural damage to the pipeline due to sudden pressure changes.

[0034] An electrostatic precipitator 8 is also fixedly installed in the protection frame 1. The electrostatic precipitator 8 is arranged below the SCR reactor 2. The outlet pipe of the SCR reactor 2 is connected to the electrostatic precipitator 8. The tail gas after passing through the SCR reactor 2 can enter the electrostatic precipitator 8 to ionize the tail gas and reduce the dust content in the tail gas. Among them, a diversion valve 27 is installed on the outlet pipe connecting the SCR reactor 2 and the electrostatic precipitator 8, and a second motor 28 is installed on the outside of the diversion valve 27; by setting the diversion valve 27, the flow direction of the tail gas can be unidirectional to prevent the tail gas from flowing back into the SCR reactor 2.

[0035] The top of the electrostatic precipitator 8 is provided with an FGD absorber 9 connected to the electrostatic precipitator 8, and the FGD absorber 9 can process sulfur dioxide in the tail gas and convert sulfur dioxide into sulfate. The top of the steam generator 4 is respectively fixedly connected with a second steam delivery pipe 10 and a third steam delivery pipe 11, wherein the second steam delivery pipe 10 is connected to the electrostatic precipitator 8, and the third steam delivery pipe 11 is connected to the FGD absorber 9; by providing the second steam delivery pipe 10 and the third steam delivery pipe 11, high-temperature steam can be continuously introduced into the electrostatic precipitator 8 and the FGD absorber 9, so that each structure through which the tail gas flows is in a high-temperature state adapted to the device. Among them, a third motor 29 for accelerating the steam flow rate is installed on the pipeline of the third steam delivery pipe 11; by providing the third motor 29, the flow rate of the tail gas and steam in the overall device can be accelerated, thereby improving the denitration reaction rate of the overall device. A three-way pipe 30 is fixedly installed at the end of the third steam delivery pipe 11, and the two outlet ends of the three-way pipe 30 are connected to the FGD absorber 9, so that the steam input in the FGD absorber 9 is more uniform and space leakage is avoided.

[0036] The top side of the FGD absorber 9 is connected with a tail gas outlet pipe 12, and the tail gas outlet pipe 12 is connected with a condenser 13. The side of the steam generator 4 is fixedly connected with a fifth steam delivery pipe 31, and the fifth steam delivery pipe 31 is connected with the tail gas outlet pipe 12 through a second manifold 32, and the second manifold 32 is tightly connected with the inlet end of the condenser 13. By sending steam into the tail gas outlet pipe 12, the impurity content in the tail gas can be further reduced, so that the condensed water in the condenser 13 adsorbs small particles of impurities in the tail gas, and further ensures the cleanliness of the tail gas. The condenser 13 is provided with an exhaust pipe 14 for exhaust gas discharge, the exhaust pipe 14 is arranged horizontally, and the inlet end of the exhaust pipe 14 is arranged on the side wall of the condenser 13; the condenser 13 is provided with a water outlet pipe 15 for condensed water discharge, the water outlet pipe 15 is arranged vertically, and the inlet end of the water outlet pipe 15 is arranged on the bottom end surface of the condenser 13. By arranging the water outlet pipe 15 and the exhaust pipe 14 with openings at different heights, the exhaust gas can be separated from the condensed water, and the condensed water can flow out of the condenser 13 directly.

[0037] The working principle of the present invention is:

[0038] The blower 17 can deliver air to the air inlet pipe 16, and the ammonia delivery valve 7 can deliver ammonia to the ammonia delivery pipe 6, and mix them in the mixer 23, so that they are merged into the first steam delivery pipe 5 through the ammonia delivery pipe 6, and the ammonia mixed with air and high-temperature water vapor can be delivered to the SCR reactor 2 through the first steam delivery pipe 5; the exhaust gas of the gas generator set can enter the SCR reactor 2 through the exhaust gas inlet pipe 3, and the SCR reactor 2 can fully mix the exhaust gas and ammonia, and catalytic reduction reaction occurs, so that the ammonia reacts with the nitrogen oxides in the exhaust gas to generate nitrogen and water; then the exhaust gas passes through the electrostatic precipitator 8 to remove large particles of impurities in the exhaust gas. The exhaust gas flows through the electrostatic precipitator 8 and enters the FGD absorber 9, which processes the sulfur dioxide in the exhaust gas and converts the sulfur dioxide into sulfate. The exhaust gas flows through the FGD absorber 9 and continues to flow through the fifth steam delivery pipe 31. The fifth steam delivery pipe 31 continues to introduce high-temperature water vapor, so that the condenser 13 further absorbs impurities in the exhaust gas, and the exhaust gas is discharged through the exhaust pipe 14.

[0039] The above description of the disclosed embodiments enables one skilled in the art to implement or use the present invention. Various modifications to these embodiments will be apparent to one skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the present invention. Therefore, the present invention will not be limited to the embodiments shown herein, but rather to the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A gas generator set tail gas denitration device, comprising a protection frame (1), characterized in that: An SCR reactor (2) is fixedly installed inside the protection frame (1), and a tail gas inlet pipe (3) for tail gas to enter is connected to the top of the SCR reactor (2). A steam generator (4) is arranged on the side of the SCR reactor (2), and a first steam delivery pipe (5) is fixedly connected to the side of the steam generator (4), and the first steam delivery pipe (5) is connected to the SCR reactor (2). The first steam delivery pipe (5) is connected to an ammonia delivery pipe (6), and an ammonia delivery valve (7) connected to an ammonia evaporator is installed at the end of the ammonia delivery pipe (6); an electrostatic precipitator (8) is fixedly installed inside the protection frame (1), and the outlet pipe of the SCR reactor (2) is connected to the electrostatic precipitator (8). The electrostatic precipitator (8) is connected to a condenser (13); a FGD absorber (9) connected to the electrostatic precipitator (8) is arranged on the top of the electrostatic precipitator (8); a second steam delivery pipe (10) and a third steam delivery pipe (11) are fixedly connected to the top of the steam generator (4), respectively; the second steam delivery pipe (10) is connected to the electrostatic precipitator (8); the third steam delivery pipe (11) is connected to the FGD absorber (9); a tail gas outlet pipe (12) is connected to the top side of the FGD absorber (9); the tail gas outlet pipe (12) is connected to a condenser (13); the condenser (13) is provided with an exhaust pipe (14) for exhaust gas discharge and a water outlet pipe (15) for condensed water discharge.

2. A gas generator set tail gas denitration device according to claim 1, characterized in that: The ammonia delivery pipe (6) is connected to an air inlet pipe (16), the air inlet pipe (16) is connected to a blower (17), an air supply fan (18) is rotatably mounted on the side of the blower (17), a plurality of air filter cartridges (19) are mounted inside the blower (17), and the air filter cartridges (19) are all connected to the air inlet pipe (16).

3. A gas generator set tail gas denitration device according to claim 2, characterized in that: A grid plate (20) fixedly mounted on the side of the air blower (17) is arranged on the outside of the air filter cartridge (19), and every two air filter cartridges (19) are connected to each other via a bend pipe (21). The bend pipe (21) is arranged on the outside of the air blower (17), and each bend pipe (21) is connected to a first manifold (22), and the first manifold (22) is connected to the air inlet pipe (16).

4. A gas generator set tail gas denitration device according to claim 2, characterized in that: A mixer (23) is fixedly installed at the confluence of the air inlet pipe (16) and the ammonia delivery pipe (6), and a pressure buffer tank (24) is provided on the ammonia delivery pipe (6).

5. The exhaust denitration device for a gas-fired generator set according to claim 1, characterized in that: A fourth steam delivery pipe (25) is connected to the top of the steam generator (4), and the fourth steam delivery pipe (25) is in communication with the first steam delivery pipe (5).

6. The exhaust denitration device for a gas-fired generator set according to claim 1, characterized in that: A first motor (26) for driving is fixedly mounted on the top of the SCR reactor (2).

7. The exhaust denitration device for a gas-fired generator set according to claim 1, characterized in that: A guide valve (27) is installed on the gas outlet pipeline connecting the SCR reactor (2) and the electrostatic precipitator (8), and a second motor (28) is installed outside the guide valve (27).

8. The exhaust denitration device for a gas-fired generator set according to claim 1, characterized in that: A third motor (29) for accelerating the flow rate of steam is installed on the pipeline of the third steam delivery pipe (11); a three-way pipe (30) is fixedly installed at the end of the third steam delivery pipe (11), and two outlet ends of the three-way pipe (30) are connected to the FGD absorber (9).

9. The exhaust denitration device for a gas-fired generator set according to claim 1, characterized in that: A fifth steam delivery pipe (31) is fixedly connected to the side of the steam generator (4); the fifth steam delivery pipe (31) is connected to the tail gas outlet pipe (12) via a second manifold (32); and the second manifold (32) is fixedly connected to the inlet end of the condenser (13).

10. The exhaust denitration device of a gas-fired generator set according to claim 1, characterized in that: The exhaust pipe (14) is arranged horizontally, and the inlet end of the exhaust pipe (14) is arranged on the side wall of the condenser (13); the water outlet pipe (15) is arranged vertically, and the inlet end of the water outlet pipe (15) is arranged on the bottom end surface of the condenser (13).

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