Ammonia spraying uniform distribution device for SCR (selective catalytic reduction) denitration system of thermal power plant

Abstract

The utility model discloses a thermal power plant SCR (Selective Catalytic Reduction) denitration system ammonia spraying uniform distribution device, which relates to the technical field of flue gas denitration and comprises a uniform distribution reaction kettle, an ammonia gas mixing kettle, an ammonia gas mixing component, a gas flow control valve, a smoke suction pump and an ammonia gas sensor, during use, firstly, an operator respectively introduces air and ammonia gas into the ammonia gas mixing kettle through an air input pipe and an ammonia gas input pipe, then, the operator sequentially starts a mixing motor, a start-stop motor and a driving motor of a smoke suction pump through a controller, and the mixing motor drives a mixing driving shaft to rotate and simultaneously drives the mixing shaft to rotate at a high speed; ammonia gas and air can be rapidly and efficiently mixed, the ball bearing is installed on the surface of the inner wall of the middle penetrating position of the top end of the ammonia gas mixing kettle, the friction force of the mixing drive shaft can be effectively reduced, and the first sealing piece is responsible for sealing and evenly distributing the joint of the reaction kettle and the ammonia gas conveying pipe to prevent leakage of the air and the ammonia gas.

Description

Technical Field

[0001] The utility model relates to the technical field of flue gas denitration, in particular to an ammonia injection uniform distribution device for an SCR denitration system in a thermal power plant. Background Technique

[0002] SCR (Selective Catalytic Reduction) technology is a mature technology for flue gas denitration in thermal power plants. It promotes the reaction of ammonia with nitrogen oxides (NOx) at a lower temperature by using a catalyst, converting them into nitrogen gas (N2) and water vapor (H2O), thereby reducing NOx emissions in the flue gas. The SCR system is usually installed between the economizer outlet and the air preheater inlet of the boiler to ensure that the denitration reaction occurs within the optimal temperature range. However, when the existing flue gas in thermal power plants undergoes ammonia denitration, it takes time to mix ammonia with air, and there will be errors and risks during manual detection, reducing the accuracy and reliability of detection.

[0003] Therefore, those skilled in the art have provided an ammonia injection uniform distribution device for an SCR denitration system in a thermal power plant to solve the problems raised in the above background technique. Content of the Utility Model

[0004] The purpose of the utility model is to provide an ammonia injection uniform distribution device for an SCR denitration system in a thermal power plant to solve the problems raised in the above background technique.

[0005] To achieve the above purpose, the utility model provides the following technical solution:

[0006] An ammonia injection uniform distribution device for an SCR denitration system in a thermal power plant includes a uniform distribution reaction kettle, an ammonia mixing kettle, an ammonia mixing component, a gas control valve, a smoking pump, and an ammonia sensor. The left side of the top of the uniform distribution reaction kettle is movably connected to an ammonia delivery pipe through a penetration. The middle of the top of the ammonia delivery pipe is movably connected to the ammonia mixing kettle. The upper side of the left end of the ammonia mixing kettle is movably connected to an air input pipe through a penetration. The lower side of the left end of the ammonia mixing kettle is movably connected to an ammonia input pipe through a penetration. The middle of the top of the ammonia mixing kettle is movably connected to the ammonia mixing component through a penetration. The middle of the top of the ammonia mixing component is movably connected to a mixing motor through a penetration. The inner wall surface of the mixing motor is rotatably connected to a mixing drive shaft. Both the left and right ends of the mixing drive shaft are fixedly connected to mixing shafts at a position slightly below the middle. The inner wall surface of the middle of the top of the ammonia mixing kettle is movably connected to a ball bearing through a penetration. The upper side of the outer wall surface of the ammonia delivery pipe is movably connected to a control valve through a penetration. The lower side of the outer wall surface of the ammonia delivery pipe is movably connected to a first seal. The lower side of the inner wall surface of the ammonia delivery pipe is movably connected to a spray pipe. The middle of the bottom end of the spray pipe is movably connected to a nozzle.

[0007] As a further solution of the utility model: A gas flow control valve is movably connected to the penetrating part on the outer wall surface of the right side of the air inlet pipe and the ammonia inlet pipe, and a motor fixing part is movably connected to the penetrating part in the middle of the top end of the gas flow control valve.

[0008] As a further solution of the utility model: An opening and closing motor is movably connected to the penetrating part in the middle of the top end of the motor fixing part, and an opening and closing drive shaft is rotatably connected to the inner wall surface of the opening and closing motor.

[0009] As a further solution of the utility model: An opening and closing valve is movably connected to the middle part of the outer wall surface of the opening and closing drive shaft, and a protective bearing is movably connected to the outer surface of the other end of the opening and closing drive shaft.

[0010] As a further solution of the utility model: A smoking pump is movably connected to the upper right side of the top end of the uniformly distributed reaction kettle, and a smoking pipe is movably connected to the penetrating part on the lower right side of the right end of the smoking pump.

[0011] As a further solution of the utility model: An exhaust pipe is movably connected to the penetrating part on the upper left side of the smoking pump, and a second seal is movably connected to the penetrating part on the lower side of the outer wall surface of the exhaust pipe.

[0012] As a further solution of the utility model: An ammonia sensor is provided on the upper front side of the ammonia mixing kettle, and a display is provided on the upper front side of the ammonia sensor.

[0013] As a further solution of the utility model: A sensing line is movably connected to the lower rear side of the ammonia sensor, and a sensor probe is movably connected to the middle part of the other end of the sensing line.

[0014] Compared with the prior art, the beneficial effects of the utility model are:

[0015] 1. During use, first, the operator introduces air and ammonia into the ammonia mixing kettle through the air input pipe and the ammonia input pipe respectively, and then, the operator turns on the mixing motor, the opening and closing motor and the driving motor of the smoke pump in sequence through the controller, and the mixing motor drives the mixing driving shaft to rotate, and at the same time drives the mixing shaft to rotate at a high speed, so that it can quickly and efficiently mix the ammonia and air, and the ball bearing is installed on the inner wall surface of the middle penetration at the top of the ammonia mixing kettle, which can effectively reduce the friction of the mixing driving shaft, and the first seal is responsible for sealing the connection between the uniform reactor and the ammonia delivery pipe to prevent air and ammonia leakage; after the ammonia and air are mixed, the driving motor of the smoke pump provides power for the smoke pump, sucks the smoke from the smoke pipe to the smoke pump, and discharges the smoke into the uniform reactor through the smoke exhaust pipe; after that, the operator opens the control valve, and the mixed ammonia is introduced into the nozzle from the nozzle, and the mixed ammonia is sprayed out through the nozzle, and the ammonia and smoke are fully mixed. contact, thereby improving the efficiency of the denitrification reaction; in addition, the ammonia sensor is responsible for real-time monitoring of the ammonia concentration in the ammonia mixing kettle, the sensing route is responsible for transmitting the detection signal of the sensor probe to the ammonia sensor, the display is responsible for displaying the ammonia concentration detected by the ammonia sensor, and the on-off motor drives the on-off drive shaft to flip, thereby driving the on-off valve to open and close, which can control the delivery speed of the mixed gas. The on-off valve adopts an electric actuator, which can automatically adjust the opening of the on-off valve to achieve precise control of the delivery volume, so as to accurately control the concentration of ammonia; the delivery volume of ammonia and air is precisely adjusted by the control valve to ensure that the concentration and flow rate of the mixed gas meet the requirements of the denitrification reaction, and the nozzle is used for high-speed, atomized spraying to increase the contact area between the mixed gas and the flue gas, thereby improving the efficiency of the denitrification reaction, and the ammonia sensor is used to monitor the ammonia concentration in real time, thereby avoiding the errors and dangers of manual detection and improving the accuracy and reliability of detection. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 This is a structural schematic diagram of an ammonia spray distribution device for an SCR denitrification system in a thermal power plant.

[0017] Figure 2 This is a schematic diagram of the structure of an ammonia mixing kettle in an ammonia distribution device of an SCR denitrification system in a thermal power plant.

[0018] Figure 3 It is a plan view of a flow control valve in an ammonia distribution device of an SCR denitrification system in a thermal power plant.

[0019] Figure 4 This is a schematic diagram of the structure of an ammonia sensor in an ammonia distribution device of an SCR denitrification system in a thermal power plant.

[0020] Figure 5 It is a plan schematic diagram of an ammonia mixing component in an ammonia distribution device of an SCR denitrification system in a thermal power plant.

[0021] Figure 6 It is a structural schematic diagram of a flue gas extraction pump in an ammonia injection uniform distribution device for an SCR denitration system in a thermal power plant.

[0022] In the figure: 1-uniform reaction kettle, 2-ammonia delivery pipe, 3-ammonia mixing kettle, 4-air input pipe, 5-ammonia input pipe, 6-ammonia mixing assembly, 7-mixing motor, 8-mixing drive shaft, 9-mixing shaft, 10-ball bearing, 11-control valve, 12-first seal, 13-spray pipe, 14-nozzle, 15-gas flow control valve, 16-motor fixing part, 17-opening and closing motor, 18-opening and closing drive shaft, 19-opening and closing valve, 20-protective bearing, 21-smoking pump, 22-smoking pipe, 23-exhaust pipe, 24-first seal, 25-ammonia sensor, 26-display, 27-sensing line, 28-sensor probe. Specific implementation manners

[0023] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention.

[0024] Embodiment 1

[0025] Refer to Figures 1-6, this embodiment provides an ammonia injection distribution device for an SCR denitration system in a thermal power plant, including a distribution reaction kettle 1, an ammonia delivery pipe 2, an ammonia mixing kettle 3, an air input pipe 4, an ammonia input pipe 5, an ammonia mixing component 6, a mixing motor 7, a mixing drive shaft 8, a mixing shaft 9, a ball bearing 10, a control valve 11, a first seal 12, a spray pipe 13, a nozzle 14, a gas flow control valve 15, a motor fixing piece 16, an opening and closing motor 17, an opening and closing drive shaft 18, an opening and closing valve 19, a protection bearing 20, a smoking pump 21, a smoking pipe 22, a smoke exhaust pipe 23, a second seal 24, an ammonia sensor 25, a display 26, a sensing line 27, and a sensor probe 28. The left side of the top of the distribution reaction kettle 1 is movably connected to the ammonia delivery pipe 2 through a through hole. The middle of the top of the ammonia delivery pipe 2 is movably connected to the ammonia mixing kettle 3. The upper side of the left end of the ammonia mixing kettle 3 is movably connected to the air input pipe 4 through a through hole. The lower side of the left end of the ammonia mixing kettle 3 is movably connected to the ammonia input pipe 5 through a through hole. The middle of the top of the ammonia mixing kettle 3 is movably connected to the ammonia mixing component 6 through a through hole. The middle of the top of the ammonia mixing component 6 is movably connected to the mixing motor 7 through a through hole. The inner wall surface of the mixing motor 7 is rotatably connected to the mixing drive shaft 8. The lower sides of the left and right ends of the mixing drive shaft 8 are fixedly connected to the mixing shaft 9. The inner wall surface of the through hole in the middle of the top of the ammonia mixing kettle 3 is movably connected to the ball bearing 10. The upper side of the outer wall surface of the ammonia delivery pipe 2 is movably connected to the control valve 11 through a through hole. The lower side of the outer wall surface of the ammonia delivery pipe 2 is movably connected to the first seal 12. The lower side of the inner wall surface of the ammonia delivery pipe 2 is movably connected to the spray pipe 13. The middle of the bottom end of the spray pipe 13 is movably connected to the nozzle 14. The right outer wall surfaces of the air input pipe 4 and the ammonia input pipe 5 are movably connected to the gas flow control valve 15 through through holes. The middle of the top of the gas flow control valve 15 is movably connected to the motor fixing piece 16 through a through hole. The middle of the top of the motor fixing piece 16 is movably connected to the opening and closing motor 17 through a through hole. The inner wall surface of the opening and closing motor 17 is rotatably connected to the opening and closing drive shaft 18. The middle of the outer wall surface of the opening and closing drive shaft 18 is movably connected to the opening and closing valve 19. The outer surface of the other end of the opening and closing drive shaft 18 is movably connected to the protection bearing 20. The right side of the top of the distribution reaction kettle 1 is movably connected to the smoking pump 21. The lower right side of the smoking pump 21 is movably connected to the smoking pipe 22 through a through hole. The upper left side of the smoking pump 21 is movably connected to the smoke exhaust pipe 23 through a through hole. The lower side of the outer wall surface of the smoke exhaust pipe 23 is movably connected to the second seal 24 through a through hole. The upper front side of the ammonia mixing kettle 3 is provided with the ammonia sensor 25. The upper front side of the ammonia sensor 25 is provided with the display 26. The lower back side of the ammonia sensor 25 is movably connected to the sensing line 27. The middle of the other end of the sensing line 27 is movably connected to the sensor probe 28;In use, first, the operator introduces air and ammonia into the ammonia mixing kettle 3 through the air inlet pipe 4 and the ammonia inlet pipe 5 respectively. Then, the operator sequentially turns on the drive motors of the mixing motor 7, the opening and closing motor 17, and the smoking pump 21 through the controller. The mixing motor 7 drives the mixing drive shaft 8 to rotate, and at the same time drives the mixing shaft 9 to rotate at a high speed, enabling it to quickly and efficiently mix ammonia and air. The ball bearing 10 is installed on the inner wall surface of the middle through part at the top of the ammonia mixing kettle 3, which can effectively reduce the friction of the mixing drive shaft 8. The first seal 12 is responsible for sealing the connection between the uniform reaction kettle 1 and the ammonia delivery pipe 2 to prevent air and ammonia from leaking. After the ammonia and air are mixed, the drive motor of the smoking pump 21 provides power for the smoking pump 21, sucks the flue gas from the smoking pipe 22 into the smoking pump 21, and discharges the flue gas into the uniform reaction kettle 1 through the exhaust pipe 23. Then, the operator opens the control valve 11, and the mixed ammonia is introduced into the nozzle 14 from the spray pipe 13, and the mixed ammonia is sprayed out through the nozzle 14, and the ammonia is in full contact with the flue gas, improving the efficiency of the denitration reaction. In addition, the ammonia sensor 25 is responsible for real-time monitoring of the ammonia concentration in the ammonia mixing kettle 1. The sensing line 27 is responsible for transmitting the detection signal of the sensor probe 28 to the ammonia sensor 25. The display 26 is responsible for displaying the ammonia concentration detected by the ammonia sensor 25. By driving the opening and closing drive shaft 18 to flip through the opening and closing motor 17, the opening and closing valve 19 is driven to perform opening and closing operations, so as to control the conveying speed of the mixed gas. The opening and closing valve 19 adopts an electric actuator, which can automatically adjust the opening of the opening and closing valve 19 to achieve precise control of the conveying volume, and accurately control the ammonia concentration.

[0026] For those skilled in the art, it is obvious that the present utility model is not limited to the details of the above exemplary embodiments, and can be implemented in other specific forms without departing from the spirit or basic characteristics of the present utility model. Therefore, from any point of view, the embodiments should be regarded as exemplary and non-limiting. The scope of the present utility model is defined by the appended claims rather than the above description. Therefore, all changes falling within the meaning and scope of the equivalent elements of the claims are intended to be included in the present utility model. Any reference signs in the claims should not be regarded as limiting the claimed rights.

[0027] In addition, it should be understood that although this specification is described according to the embodiments, not every embodiment only contains an independent technical solution. This narrative way of the specification is only for clarity. Those skilled in the art should regard the specification as a whole, and the technical solutions in each embodiment can also be appropriately combined to form other embodiments that can be understood by those skilled in the art.

Claims

1. A flue gas ammonia injection distribution device for SCR denitration system in thermal power plants, comprising a distribution reactor (1), an ammonia mixing kettle (3), an ammonia mixing assembly (6), a gas flow control valve (15), a smoking pump (21) and an ammonia sensor (25), characterized in that, The left side of the top of the uniform reaction kettle (1) is movably connected to the ammonia delivery pipe (2) through a penetration. The middle of the top of the ammonia delivery pipe (2) is movably connected to the ammonia mixing kettle (3). The upper side of the left end of the ammonia mixing kettle (3) is movably connected to the air input pipe (4) through a penetration. The lower side of the left end of the ammonia mixing kettle (3) is movably connected to the ammonia input pipe (5) through a penetration. The middle of the top of the ammonia mixing kettle (3) is movably connected to the ammonia mixing assembly (6) through a penetration. The middle of the top of the ammonia mixing assembly (6) is movably connected to the mixing motor (7). The inner wall surface of the mixing motor (7) is rotatably connected to the mixing drive shaft (8). The lower sides of the left and right ends of the mixing drive shaft (8) are fixedly connected to the mixing shafts (9). The inner wall surface of the penetration in the middle of the top of the ammonia mixing kettle (3) is movably connected to the ball bearing (10). The upper side of the outer wall surface of the ammonia delivery pipe (2) is movably connected to the control valve (11) through a penetration. The lower side of the outer wall surface of the ammonia delivery pipe (2) is movably connected to the first seal (12). The lower side of the inner wall surface of the ammonia delivery pipe (2) is movably connected to the spray pipe (13). The middle of the bottom end of the spray pipe (13) is movably connected to the nozzle (14).

2. The ammonia injection uniform distribution device for the SCR denitration system of a thermal power plant according to claim 1, characterized in that, The right side of the outer wall surface of the air input pipe (4) and the ammonia input pipe (5) is movably connected to the gas flow control valve (15) through a penetration. The middle of the top of the gas flow control valve (15) is movably connected to the motor fixing part (16) through a penetration.

3. The ammonia injection uniform distribution device for the SCR denitration system of a thermal power plant according to claim 2, wherein, The middle of the top of the motor fixing part (16) is movably connected to the opening and closing motor (17) through a penetration. The inner wall surface of the opening and closing motor (17) is rotatably connected to the opening and closing drive shaft (18).

4. The ammonia injection uniform distribution device for the SCR denitration system of a thermal power plant according to claim 3, wherein, The middle of the outer wall surface of the opening and closing drive shaft (18) is movably connected to the opening and closing valve (19). The outer surface of the other end of the opening and closing drive shaft (18) is movably connected to the protective bearing (20).

5. A flue gas ammonia injection uniform distribution device for SCR denitration system in thermal power plant according to claim 1, characterized in that, The right side of the top of the uniform reaction kettle (1) is movably connected to the smoking pump (21). The lower side of the right end of the smoking pump (21) is movably connected to the smoking pipe (22) through a penetration.

6. The ammonia injection uniform distribution device for the SCR denitration system of a thermal power plant according to claim 5, characterized in that, The upper side of the left end of the smoking pump (21) is movably connected to the exhaust pipe (23) through a penetration. The lower side of the outer wall surface of the exhaust pipe (23) is movably connected to the second seal (24) through a penetration.

7. The ammonia injection uniform distribution device for the SCR denitration system of a thermal power plant according to claim 1, characterized in that, The upper front side of the ammonia mixing kettle (3) is provided with an ammonia sensor (25). The upper front side of the ammonia sensor (25) is provided with a display (26).

8. The ammonia injection uniform distribution device for the SCR denitration system of a thermal power plant according to claim 7, characterized in that, The lower back side of the ammonia sensor (25) is movably connected to the sensing line (27). The middle of the other end of the sensing line (27) is movably connected to the sensor probe (28).

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