Tail gas denitration device of gas generator set

Abstract

The utility model discloses a gas generator set tail gas denitration device which comprises a denitration shell arranged in the transverse direction, a tail gas inlet and a tail gas outlet are formed in the two ends of the denitration shell in the transverse direction, a flow guide cylinder is installed in the middle of an inner cavity of the denitration shell, and a mixing cavity, a throat part and a diffusion cavity are sequentially arranged in the flow guide cylinder in the tail gas flowing direction. A catalyst module is installed at the end, away from the throat, of the diffusion cavity and located on the inner side of the tail gas outlet. A hollow motor is fixedly installed between the outer wall of the guide cylinder and the inner wall of the denitration shell, a motor shaft pipe is arranged in the hollow motor, the motor shaft pipe penetrates through the cylinder wall of the guide cylinder in the vertical direction and then extends into the throat part, and the bottom end of the motor shaft pipe is connected with an injection head through a 90-degree bent pipe. According to the tail gas denitration device provided by the utility model, particulate matters attached to the surface of a catalyst can be removed in time, so that the activity and the reaction efficiency of the catalyst are ensured, and the denitration effect on tail gas is ensured.

Description

TECHNICAL FIELD

[0001] The utility model relates to a kind of gas generator set tail gas denitration device, belong to gas generator set tail gas processing technical field. BACKGROUND

[0002] The principle of gas generator set tail gas denitration is mainly based on selective catalytic reduction (SCR) technology. This technology uses reducing agent (such as urea solution) to convert NOx in the tail gas into harmless nitrogen and water under the action of catalyst.

[0003] During gas generator set tail gas treatment, denitration treatment should be performed first to remove Nox in the tail gas, and then adsorption treatment of particulate matter is performed to reduce the emission concentration of particulate matter. This processing sequence can ensure that various pollutants in the tail gas are effectively controlled to meet environmental protection requirements.

[0004] However, during denitration treatment, particulate matter in the tail gas will inevitably adhere to the surface of the catalyst, covering the surface of the catalyst or blocking its pore structure. This covering effect reduces the activity of the catalyst, affects the catalytic reaction, reduces the denitration effect of the tail gas, and affects the service life and stability of the catalyst.

[0005] As can be seen from the above, the prior art has obvious inconvenience and defects in actual use, and therefore needs to be improved. CONTENT OF THE UTILITY MODEL

[0006] The utility model provides a kind of gas generator set tail gas denitration device for the deficiency in the background art, can remove the particulate matter adhered to the surface of catalyst in time, to ensure the activity and reaction efficiency of catalyst, ensure the denitration effect of tail gas.

[0007] To solve the above technical problems, the utility model adopts the following technical solutions:

[0008] The gas generator set tail gas denitration device includes a denitration shell arranged in the transverse direction, and the denitration shell is provided with a tail gas inlet and a tail gas outlet at both ends in the transverse direction. A flow guide cylinder is installed in the inner cavity of the denitration shell. The flow guide cylinder is provided with a mixing chamber, a throat, and a diffusion chamber in sequence along the flow direction of the tail gas. A catalyst module is installed at the end of the diffusion chamber away from the throat. The catalyst module is located inside the tail gas outlet.

[0009] A hollow motor is fixedly installed between the outer wall of the flow guide cylinder and the inner wall of the denitration shell. The hollow motor is provided with a motor shaft tube. The motor shaft tube extends to the throat after passing through the cylinder wall of the flow guide cylinder in the vertical direction. A spray head is connected to the bottom end of the motor shaft tube through a 90° elbow pipe.

[0010] Further, a gas distribution plate is fixedly installed inside the tail gas inlet. A gradually expanding chamber is provided between the gas distribution plate and the tail gas inlet.

[0011] Further, the two ends of the flow guide cylinder are fixedly connected with the inner wall of the denitration shell.

[0012] Further, the center line of the spray head is arranged in line with the center line of the throat and the denitration shell.

[0013] Further, a rotating sealing element is arranged at the connection between the motor shaft pipe and the wall of the flow guide cylinder.

[0014] Further, the top of the motor shaft pipe is connected with the bottom port of the electric three-way valve through a rotary joint.

[0015] Further, the electric three-way valve is fixedly arranged on the outer wall of the denitration shell.

[0016] Further, the left port of the electric three-way valve is connected with a urea solution inlet pipe, and the right port of the electric three-way valve is connected with a detergent solution inlet pipe.

[0017] Compared with the prior art, the above technical scheme has the following advantages:

[0018] After the catalyst module works for a period of time, the hollow motor drives the spray head to rotate by 180° through the motor shaft pipe, so that the spray head is arranged towards the diffusion chamber; the electric three-way valve communicates the detergent solution inlet pipe with the motor shaft pipe, and the detergent sequentially enters the motor shaft pipe and the spray head, the spray head sprays the detergent to the surface of the catalyst module, and the particulate matters and deposits on the surface of the catalyst module are removed through chemical reaction, so as to reduce the influence of the particulate matters on the catalyst and ensure the denitration effect on the tail gas.

[0019] The urea solution and the detergent in the utility model share one set of spray system, and the structure is compact and reasonable.

[0020] The utility model will be described in detail below in combination with the drawings and examples. DRAWINGS

[0021] Fig. 1 is the structure schematic diagram of the utility model;

[0022] Fig. 2 is the internal structure schematic diagram of the utility model;

[0023] Fig. 3 is the installation schematic diagram of the hollow shaft.

[0024] In the figure, 1 is a denitration shell, 2 is a tail gas inlet, 3 is a tail gas outlet, 4 is a gas distribution plate, 5 is a gradually expanding chamber, 6 is a flow guide cylinder, 7 is a mixing chamber, 8 is a throat, 9 is a diffusion chamber, 10 is a catalyst module, 11 is a hollow motor, 12 is a motor shaft pipe, 13 is a jet head, 14 is a rotary joint, 15 is an electric three-way valve, 16 is a urea solution inlet pipe, and 17 is a detergent solution inlet pipe. DETAILED DESCRIPTION

[0025] In order to have a clearer understanding of the technical features, objectives and effects of the utility model, the specific implementation mode of the utility model will be described with reference to the drawings.

[0026] As Figs. 1-3 As shown in the drawings, the utility model provides a tail gas denitration device of gas generating set, including the denitration shell 1 who sets along the transverse, denitration shell 1 is equipped with tail gas inlet 2 and tail gas outlet 3 at both ends along the transverse, the inner side of tail gas inlet 2 is fixedly installed with gas distribution plate 4, and gradually expanding chamber 5 is equipped between gas distribution plate 4 and tail gas inlet 2, and gas distribution plate 4 is used to distribute and diffuse evenly the tail gas.

[0027] The flow guide cylinder 6 is installed in the middle part of the inner cavity of the denitration shell 1, both ends of the flow guide cylinder 6 are fixedly connected with the inner wall of the denitration shell 1, the mixing chamber 7, the throat 8 and the diffusion chamber 9 are sequentially arranged in the flow guide cylinder 6 along the tail gas flow direction, the catalyst module 10 is installed at one end of the diffusion chamber 9 away from the throat 8, and the catalyst module 10 is located on the inner side of the tail gas outlet 3.

[0028] The hollow motor 11 is fixedly installed between the outer wall of the flow guide cylinder 6 and the inner wall of the denitration shell 1, the motor shaft pipe 12 is arranged in the hollow motor 11, the motor shaft pipe 12 extends to the throat 8 after penetrating the cylinder wall of the flow guide cylinder 6 along the vertical direction, the jet head 13 is connected to the bottom end of the motor shaft pipe 12 through a 90° elbow pipe, and the center line of the jet head 13 is arranged in line with the center lines of the throat 8 and the denitration shell 1.

[0029] A rotating sealing piece is installed at the connection between the motor shaft pipe 12 and the cylinder wall of the flow guide cylinder 6 to prevent the tail gas in the throat 8 from leaking outward.

[0030] The hollow motor 11 is a stepping motor, the hollow motor 11 provides power for switching the direction of the jet head 13, so that the jet head 13 is arranged towards the mixing chamber 7 or the diffusion chamber 9.

[0031] The top of the motor shaft pipe 12 is connected to the bottom port of the electric three-way valve 15 through the rotary joint 14, and the motor shaft pipe 12 can rotate at the rotary joint 14.

[0032] The electric three-way valve 15 is fixedly installed on the outer wall of the denitration shell 1, the left side port of the electric three-way valve 15 is connected with the urea solution inlet pipe 16, and the right side port of the electric three-way valve 15 is connected with the detergent solution inlet pipe 17.

[0033] The specific working principle of the utility model is as follows:

[0034] The tail gas enters the gradually expanding chamber 5, is uniformly distributed under the action of the gas distribution plate 4, and then diffuses into the mixing chamber 7, at the same time, the electric three-way valve 15 communicates the urea solution inlet pipe 16 with the motor shaft pipe 12, the reducing agent urea solution sequentially enters the motor shaft pipe 12 and the injection head 13 from the urea solution inlet pipe 16, the injection head 13 sprays the urea solution into the tail gas, the tail gas and the urea solution are fully mixed when passing through the throat part 8 and the diffusion chamber 9, and after mixing, enter the catalyst module 10, convert the NOX in the tail gas into harmless nitrogen and water, and then are discharged from the tail gas outlet 3.

[0035] After the catalyst module 10 works for a period of time, the hollow motor 11 drives the injection head 13 to rotate 180 degrees through the motor shaft pipe 12, so that the injection head 13 is arranged towards the diffusion chamber 9; the electric three-way valve 15 communicates the detergent solution inlet pipe 17 with the motor shaft pipe 12, the detergent sequentially enters the motor shaft pipe 12 and the injection head 13, and the injection head 13 sprays the detergent to the surface of the catalyst module 10, removes the particulate matter and deposits on the surface of the catalyst module 10 through chemical reaction, so as to reduce the influence of the particulate matter on the catalyst.

[0036] The above is the example of the best implementation mode of the utility model, wherein the parts not described in detail are the common knowledge of the ordinary skilled in the art. The protection scope of the utility model is subject to the content of the claims, and any equivalent transformation based on the technical inspiration of the utility model is also within the protection scope of the utility model.

Claims

1. A device for denitration of exhaust gas of a gas generator set, characterized in that: The device comprises a denitration shell (1) arranged in the transverse direction, the denitration shell (1) being provided with a tail gas inlet (2) and a tail gas outlet (3) at both ends in the transverse direction; a flow guide cylinder (6) is mounted in the middle of the inner cavity of the denitration shell (1), the flow guide cylinder (6) is provided with a mixing chamber (7), a throat (8) and a diffusion chamber (9) in sequence inside the flow guide cylinder (6) along the tail gas flow direction, a catalyst module (10) is mounted at the end of the diffusion chamber (9) away from the throat (8), and the catalyst module (10) is located on the inner side of the tail gas outlet (3); A hollow motor (11) is fixedly mounted between the outer wall of the flow guide cylinder (6) and the inner wall of the denitration shell (1), the hollow motor (11) is provided with a motor shaft pipe (12) inside, the motor shaft pipe (12) extends to the inside of the throat (8) after penetrating the cylinder wall of the flow guide cylinder (6) in the vertical direction, and the bottom end of the motor shaft pipe (12) is connected with a spray head (13) through a 90° elbow pipe.

2. The device for denitration of exhaust gas of a gas generating set according to claim 1, characterized in that: The inner side of the tail gas inlet (2) is fixedly mounted with a gas distribution plate (4), and the gas distribution plate (4) is provided with a gradually expanding chamber (5) between the tail gas inlet (2).

3. The device for removing NOx from exhaust gas of a gas-powered genset according to claim 1, characterized in that: Both ends of the flow guide cylinder (6) are fixedly connected with the inner wall of the denitration shell (1).

4. The device for removing NOx from exhaust gas of a gas-powered genset according to claim 1, characterized in that: The center line of the spray head (13) is arranged in a collinear manner with the center line of the throat (8) and the denitration shell (1).

5. The device for denitration of exhaust gas of a gas generating set according to claim 1, characterized in that: A rotary sealing element is mounted at the connection between the motor shaft pipe (12) and the cylinder wall of the flow guide cylinder (6).

6. The device for removing NOx from exhaust gas of a gas-powered genset according to claim 1, characterized in that: The top of the motor shaft pipe (12) is connected with the bottom port of an electric three-way valve (15) through a rotary joint (14).

7. The device for removing NOx from exhaust gas of a gas-powered generating set according to claim 6, characterized in that: The electric three-way valve (15) is fixedly mounted on the outer wall of the denitration shell (1).

8. The exhaust gas denitration apparatus for a gas-powered generator set according to claim 7, characterized by: The left port of the electric three-way valve (15) is connected with a urea solution inlet pipe (16), and the right port of the electric three-way valve (15) is connected with a detergent solution inlet pipe (17).

Images