Cement kiln tail gas denitration device

Abstract

This utility model relates to the field of denitrification technology, and in particular to a denitrification device for cement kiln tail gas. It includes a housing, with a main pipe connected to the top of the housing. An air inlet pipe is installed through the inner cavity of the main pipe. A discharge mechanism is located on the left side of the housing. A spray frame is horizontally fixedly installed inside the housing, and an atomizing spray plate is also fixedly installed inside the housing. This utility model recovers heat from the tail gas. During use, the air inlet pipe works with metal heat-conducting fins to transfer heat to the water in the main pipe, enabling heat recovery from the tail gas. The spray frame performs a first denitrification treatment on the tail gas, followed by a second denitrification treatment via a pump and the atomizing spray plate. The tail gas is then guided into lime water through a guide hood for a third treatment. During discharge, an activated carbon filter further adsorbs the tail gas.

Description

Technical Field

[0001] This utility model relates to the field of denitrification technology, specifically a denitrification device for cement kiln tail gas. Background Technology

[0002] Denitrification refers to the process of removing nitrogen oxides from industrial waste gases, such as flue gas emitted from coal-fired power plants, steel plants, cement plants, or other pollution sources, through physical, chemical, or biological methods, in order to reduce their harm to the environment and human health. It is the process of removing nitrogen oxides from combustion flue gas and is of great importance in preventing environmental pollution.

[0003] A search revealed that the announcement number is CN221492021U, and the name is "A type of waste gas denitrification equipment". The equipment includes a main denitrification device. Through research and analysis, it was found that the equipment expands the spray range by reciprocating rotation of the reducing agent spray nozzles, reduces the number of reducing agent spray nozzles and intermediate connecting pipes, and reduces the obstruction of waste gas by the intermediate connecting pipes and reducing agent spray nozzles. However, it still has the following disadvantages to a certain extent.

[0004] For example, this equipment does not have the function of recovering heat from the exhaust gas during use. When treating the exhaust gas, the exhaust gas carries a lot of heat. If it is not recovered, it is equivalent to wasting the energy that could be recovered and reused. In addition, it only treats the exhaust gas through a relatively simple structure, which reduces the efficiency of exhaust gas treatment. At the same time, the simple structure is also difficult to remove multiple pollutants efficiently at the same time. In order to solve the above technical problems, we have designed a cement kiln exhaust gas denitrification device. Utility Model Content

[0005] The purpose of this utility model is to provide a cement kiln tail gas denitrification device, which has the advantages of being able to recover waste heat from the tail gas and effectively treat the tail gas. It solves the problem that the device does not have the function of recovering heat from the tail gas, which would waste the originally recyclable energy if it is not recovered, and the tail gas is only treated through a relatively simple structure, which would reduce the tail gas treatment efficiency.

[0006] To achieve the above objectives, this utility model provides the following technical solution: a cement kiln tail gas denitrification device, comprising a housing, a main pipe connected to the top of the housing, an air inlet pipe installed through the inner cavity of the main pipe, an exhaust mechanism on the left side of the housing, a spray frame fixedly installed laterally in the inner cavity of the housing, an atomizing spray plate fixedly installed in the inner cavity of the housing, a flow guide hood fixedly installed laterally in the inner cavity of the housing, a drive motor fixedly installed at the bottom of the housing, the output end of the drive motor penetrating into the inner cavity of the housing and fixedly connected to a stirring shaft, a conveying pump fixedly installed at the rear side of the housing, and the exhaust mechanism comprising a connecting pipe connected to the left side of the housing.

[0007] Preferably, an activated carbon filter screen is installed through the front side of the connecting pipe, a connecting plate is fixedly installed on the front side of the activated carbon filter screen, an installation groove is opened in the inner cavity of the connecting pipe, and installation sliders are fixedly installed on both the upper and lower sides of the activated carbon filter screen.

[0008] Preferably, connecting blocks are fixedly installed on both the upper and lower sides of the connecting pipe, the left end of the connecting pipe is connected to a discharge pipe, a flow fan is fixedly installed horizontally in the inner cavity of the discharge pipe, and a limit rod is installed through the left side of the connecting block.

[0009] Preferably, a water temperature sensor is installed through the front side of the main pipe, and a drain valve is connected to the rear side of the main pipe.

[0010] Preferably, a metal temperature-conducting fin is fixedly installed on the surface of the air intake pipe, and the bottom of the air intake pipe extends into the inner cavity of the housing and is connected to an air outlet hood.

[0011] Preferably, a delivery pump is fixedly installed on the rear side of the housing, and the liquid outlet of the delivery pump is connected to a connecting valve. The front side of the connecting valve extends into the inner cavity of the housing and is connected to the atomizing spray plate.

[0012] Preferably, a drain valve is connected to the rear side of the housing, a liquid level sensor is installed through the right side of the housing, a water injection valve is connected to the rear side of the main pipeline, a water filling valve is connected to the rear side of the housing, and an infusion valve is installed on the right side of the spray frame.

[0013] Compared with the prior art, the beneficial effects of this utility model are as follows:

[0014] This utility model, through the cooperation of a spray frame, atomizing spray plate, drive motor, stirring shaft, liquid level sensor, delivery pump, water temperature sensor, metal temperature conductive plate, exhaust hood, diversion fan, mounting slide, connecting plate, activated carbon filter, mounting slider, and limit rod, can recover heat from exhaust gas. In use, the intake pipe cooperates with the metal temperature conductive plate to conduct heat to the water in the main pipe, enabling the recovery of heat from the exhaust gas. Furthermore, during use, the spray frame performs the first denitrification treatment on the exhaust gas, and then the delivery pump performs a second denitrification treatment on the exhaust gas through the atomizing spray plate. Subsequently, the exhaust gas is guided into lime water through the diversion hood, allowing the lime water to perform a third treatment on the exhaust gas. During discharge, the activated carbon filter also adsorbs the exhaust gas. Attached Figure Description

[0015] Figure 1 This is a three-dimensional cross-sectional view of the structure of this utility model;

[0016] Figure 2This is a rear perspective view of the structure of this utility model;

[0017] Figure 3 This is a three-dimensional sectional view of the main pipeline of this utility model.

[0018] Figure 4 This is an exploded perspective view of the partial structure of the emission mechanism of this utility model.

[0019] In the diagram: 1. Box body; 2. Main pipe; 3. Air inlet pipe; 4. Spray frame; 5. Infusion valve; 6. Atomizing spray plate; 7. Flow guide hood; 8. Drive motor; 9. Agitator shaft; 10. Liquid level sensor; 11. Discharge mechanism; 12. Discharge valve; 13. Transfer pump; 14. Connecting valve; 15. Drain valve; 16. Water temperature sensor; 17. Metal temperature conductive plate; 18. Air outlet hood; 19. Connecting pipe; 20. Discharge pipe; 21. Drainage fan; 22. Mounting slide; 23. Connecting plate; 24. Activated carbon filter; 25. Mounting slider; 26. Limiting rod; 27. Connecting block. Detailed Implementation

[0020] Please see Figures 1-4 A denitrification device for cement kiln exhaust gas includes a housing 1. A main pipe 2 is connected to the top of the housing 1, and an air inlet pipe 3 is installed through the inner cavity of the main pipe 2. An exhaust mechanism 11 is provided on the left side of the housing 1. A spray frame 4 is fixedly installed horizontally in the inner cavity of the housing 1. An atomizing spray plate 6 is fixedly installed in the inner cavity of the housing 1. A guide hood 7 is fixedly installed horizontally in the inner cavity of the housing 1. A drive motor 8 is fixedly installed at the bottom of the housing 1. The output end of the drive motor 8 passes through the inner cavity of the housing 1 and is fixedly connected to a stirring shaft 9. A delivery pump 13 is fixedly installed on the rear side of the housing 1. The exhaust mechanism 11 includes a connecting pipe 19, which is connected to the left side of the housing 1. Through the cooperation of the drive motor 8 and the stirring shaft 9, the drive motor 8 can drive the stirring shaft 9 to stir the lime water to prevent the lime water from settling.

[0021] Please see Figure 1 , Figure 2 and Figure 4 An activated carbon filter screen 24 is installed through the front side of the connecting pipe 19. A connecting plate 23 is fixedly installed on the front side of the activated carbon filter screen 24. An installation groove 22 is opened in the inner cavity of the connecting pipe 19. Installation sliders 25 are fixedly installed on both the upper and lower sides of the activated carbon filter screen 24. The connecting plate 23 facilitates the installation of the activated carbon filter screen 24. The cooperation of the installation groove 22 and the installation slider 25 can guide and position the activated carbon filter screen 24 to prevent it from moving.

[0022] Please see Figure 1 , Figure 2 and Figure 4Connecting blocks 27 are fixedly installed on both the upper and lower sides of the connecting pipe 19. The left end of the connecting pipe 19 is connected to the discharge pipe 20. The inner cavity of the discharge pipe 20 is horizontally fixedly installed with a flow fan 21. A limiting rod 26 is installed through the left side of the connecting block 27. Through the cooperation of the connecting block 27 and the limiting rod 26, the connecting plate 23 can be limited and fixed to prevent the activated carbon filter screen 24 from falling out of the connecting pipe 19.

[0023] Please see Figure 2 and Figure 3 A water temperature sensor 16 is installed through the front of the main pipe 2, and a drain valve 12 is connected to the rear of the main pipe 2. By setting the water temperature sensor 16, the temperature of the water in the main pipe 2 can be monitored in real time.

[0024] Please see Figure 1 and Figure 3 A metal heat-conducting plate 17 is fixedly installed on the surface of the air intake pipe 3. The bottom of the air intake pipe 3 extends into the inner cavity of the box 1 and is connected to the air outlet hood 18. By setting the metal heat-conducting plate 17, it can cooperate with the air intake pipe 3 to conduct heat.

[0025] Please see Figure 2 A delivery pump 13 is fixedly installed on the rear side of the housing 1. The outlet end of the delivery pump 13 is connected to a connecting valve 14. The front side of the connecting valve 14 extends into the inner cavity of the housing 1 and is connected to the atomizing spray plate 6. By setting the delivery pump 13, lime water can be delivered so that it can be recycled.

[0026] Please see Figure 2 A drain valve 15 is connected to the rear side of the tank 1, and a liquid level sensor 10 is installed through the right side of the tank 1. A water injection valve is connected to the rear side of the main pipe 2, and a water filling valve is connected to the rear side of the tank 1. A liquid delivery valve 5 is installed on the right side of the spray frame 4. By setting the drain valve 15, it is easy to drain the high-temperature liquid and replace the liquid. By setting the liquid level sensor 10, the liquid level of lime water in the tank 1 can be monitored to prevent the liquid level from being too low.

[0027] In operation, the user first injects water into the main pipe 2 through the water injection valve, and then injects lime water into the bottom of the tank 1 for storage through the water injection valve. Simultaneously, the user uses a conveying device to guide the exhaust gas into the intake pipe 3, allowing the intake pipe 3 to guide the exhaust gas into the tank 1. When the exhaust gas enters the intake pipe 3, it works with the metal heat-conducting plate 17 to transfer the heat from the exhaust gas into the water in the main pipe 2, enabling waste heat recovery. When the exhaust gas enters the tank 1, an external liquid delivery device injects reducing agent into the spray frame 4 through the liquid delivery valve 5, allowing the spray frame 4 to perform spray denitrification treatment on the exhaust gas. During the process, the user can also start the delivery pump 13, which can deliver lime water to the atomizing spray plate 6 through the connecting valve 14, so that the atomizing spray plate 6 can cooperate with the spray frame 4 to carry out denitrification treatment. At the same time, the guide hood 7 will also deliver the falling water and exhaust gas to the lime water at the bottom of the main pipe 2 for reaction, so that the lime water can perform secondary treatment on the exhaust gas. After treatment, the residual exhaust gas will float upwards, and then the user can start the drainage fan 21 to allow the floating exhaust gas to enter the connecting pipe 19. Then the activated carbon filter 24 will filter and adsorb the exhaust gas, thereby increasing the effect of exhaust gas treatment.

[0028] In summary, this cement kiln exhaust gas denitrification device, through the cooperation of housing 1, main pipeline 2, air inlet pipeline 3, spray frame 4, liquid delivery valve 5, atomizing spray plate 6, guide hood 7, drive motor 8, stirring shaft 9, and liquid level sensor 10, solves the problem of not having the function of recovering heat from the exhaust gas. Without recovery, the energy that could have been recovered would be wasted, and the exhaust gas is treated with a relatively simple structure, which would reduce the efficiency of exhaust gas treatment.

Claims

1. A cement kiln tail gas denitration device, comprising a box body (1), characterized in that: The top of the box (1) is connected to a main pipe (2), and an air inlet pipe (3) is installed through the inner cavity of the main pipe (2). An exhaust mechanism (11) is provided on the left side of the box (1). A spray frame (4) is fixedly installed horizontally in the inner cavity of the box (1). An atomizing spray plate (6) is fixedly installed in the inner cavity of the box (1). A flow guide (7) is fixedly installed horizontally in the inner cavity of the box (1). A drive motor (8) is fixedly installed at the bottom of the box (1). The output end of the drive motor (8) extends through the inner cavity of the box (1) and is fixedly connected to an agitator shaft (9). A delivery pump (13) is fixedly installed on the rear side of the box (1). The exhaust mechanism (11) includes a connecting pipe (19), which is connected to the left side of the box (1).

2. The device for denitration of cement kiln tail gas according to claim 1, characterized in that: An activated carbon filter screen (24) is installed through the front side of the connecting pipe (19), and a connecting plate (23) is fixedly installed on the front side of the activated carbon filter screen (24). An installation groove (22) is opened in the inner cavity of the connecting pipe (19), and installation sliders (25) are fixedly installed on both the upper and lower sides of the activated carbon filter screen (24).

3. The cement kiln tail gas denitrification device according to claim 2, characterized in that: Connecting blocks (27) are fixedly installed on both the upper and lower sides of the connecting pipe (19). The left end of the connecting pipe (19) is connected to the discharge pipe (20). A flow fan (21) is fixedly installed horizontally in the inner cavity of the discharge pipe (20). A limit plug (26) is installed through the left side of the connecting block (27).

4. The device for denitration of cement kiln tail gas according to claim 1, characterized in that: A water temperature sensor (16) is installed through the front side of the main pipe (2), and a drain valve (12) is connected to the rear side of the main pipe (2).

5. The device for denitration of cement kiln tail gas according to claim 1, characterized in that: The surface of the air intake pipe (3) is fixedly installed with a metal temperature conducting sheet (17), and the bottom of the air intake pipe (3) extends through the inner cavity of the box (1) and is connected to the air outlet hood (18).

6. The device for denitration of cement kiln tail gas according to claim 1, characterized in that: A delivery pump (13) is fixedly installed on the rear side of the housing (1). The liquid outlet of the delivery pump (13) is connected to a connecting valve (14). The front side of the connecting valve (14) extends into the inner cavity of the housing (1) and is connected to the atomizing spray plate (6).

7. The device for denitration of cement kiln tail gas according to claim 1, characterized in that: The rear side of the box (1) is connected to a drain valve (15), the right side of the box (1) is connected to a liquid level sensor (10), the rear side of the main pipe (2) is connected to a water injection valve, the rear side of the box (1) is connected to a water filling valve, and the right side of the spray frame (4) is connected to an infusion valve (5).

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