Cement kiln flue gas denitration device

Abstract

The utility model discloses a cement kiln flue gas denitration device, which relates to the technical field of flue gas denitration and comprises a gas inlet pipe, one end of the gas inlet pipe is communicated with a flue gas outlet of a cement kiln, the other end of the gas inlet pipe is communicated with a separating box, a fan is arranged between the separating box and the gas inlet pipe, a collecting box is arranged at the bottom of the separating box, and a gas outlet of the collecting box is communicated with the gas inlet pipe. A baffle plate is fixedly arranged on the inner wall, close to the gas inlet pipe, of the separation box, the baffle plate is downwards and obliquely arranged in the direction far away from the gas inlet pipe, and the upper end of the separation box is fixedly communicated with a denitration pipeline. The baffle arranged in the separation box can prevent smoke dust collected in the collection box from rising continuously due to airflow caused by the draught fan, light smoke dust in smoke can be screened through the arranged screen, and the screen can be easily replaced through the arranged replacement mechanism.

Description

Technical Field

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

[0002] Traditional cement kilns produce harmful gases during production. These gases, when directly released into the air, cause severe air pollution. Traditional methods simply involve installing gas treatment devices at the top of the kiln to treat these gases. However, this method is not entirely effective. Because there are gaps between the device and the kiln wall, gases produced in the kiln can still escape directly into the air, continuing to affect air quality. Furthermore, traditional denitrification methods for harmful gases mostly use reducing agents, which become less effective over time.

[0003] According to Chinese patent document CN212692555U, a denitrification device for cement kiln flue gas is disclosed. This denitrification device has a simple structure and can achieve more efficient denitrification after treating the dust inside the exhaust gas.

[0004] However, the aforementioned devices can only collect the heavier dust particles in the flue gas into the dust collection box during use, while the lighter dust particles still enter the main filter channel with the flue gas. Furthermore, because the fan operates continuously, the airflow it generates causes the collected dust particles in the dust collection box to rise continuously, affecting the dust collection efficiency. Therefore, a denitrification device for cement kiln flue gas is proposed. Utility Model Content

[0005] The purpose of this invention is to provide a denitrification device for cement kiln flue gas to solve the problems mentioned in the background art.

[0006] To achieve the above objectives, this utility model provides the following technical solution: a denitrification device for cement kiln flue gas, comprising an inlet pipe, one end of which is connected to the flue gas outlet of the cement kiln, and the other end of which is connected to a separation box. A fan is provided between the separation box and the inlet pipe. A collection box is provided at the bottom of the separation box. A baffle is fixedly installed on the inner wall of the separation box near the inlet pipe. The baffle is inclined downwards in the direction away from the inlet pipe. A denitrification pipe is fixedly connected to the upper end of the separation box. A screen is provided at the junction of the denitrification pipe and the separation box. A replacement mechanism for the screen is provided on the outer wall of the denitrification pipe. Multiple filter frames are also provided inside the denitrification pipe above the screen. SNCR denitrification catalyst is placed in each filter frame. A detection and reflux mechanism for the flue gas is provided at the top of the denitrification pipe.

[0007] As a further preferred embodiment of this technical solution, a fixing frame is fitted on the outer wall of the separation box and the fixing frame is fixedly connected.

[0008] As a further preferred embodiment of this technical solution, a connecting sleeve is fixedly installed at the bottom opening of the separation box, and the inner wall of the collection box and the outer wall of the connecting sleeve are connected by a threaded connection.

[0009] As a further preferred embodiment of this technical solution, the replacement mechanism includes two winding shafts symmetrically distributed on both sides of the denitrification pipe. Each end of the winding shaft is rotatably connected to a fixing plate, which is fixedly connected to the outer wall of the denitrification pipe. The two ends of the screen penetrate through slots opened on the two side walls of the denitrification pipe, and the two ends of the screen are wound around the two winding shafts.

[0010] As a further preferred embodiment of this technical solution, elastic sealing strips are fixedly installed on the upper and lower inner walls of the through groove, respectively.

[0011] As a further preferred embodiment of this technical solution, the inner wall of the denitrification pipe is provided with a groove that slides and fits with the filter frame, one end of the filter frame slides through the side wall of the denitrification pipe, and the extended end of the filter frame is fixedly connected with a handle.

[0012] As a further preferred embodiment of this technical solution, a sealing sleeve is fitted onto the outer wall of the extended end of the filter frame.

[0013] As a further preferred embodiment of this technical solution, the detection reflux mechanism consists of a gas detector, a three-way valve, an exhaust pipe, and a return pipe. The gas detector is fixedly installed on the upper side of the denitrification pipeline. The inlet of the gas detector is in communication with the interior of the denitrification pipeline. The upper end of the denitrification pipeline is fixedly connected to a three-way valve. The first outlet of the three-way valve is fixedly connected to an exhaust pipe. The second outlet of the three-way valve is fixedly connected to a return pipe. The other end of the return pipe is in communication with the side wall of the inlet pipe.

[0014] This utility model provides a denitrification device for flue gas from a cement kiln, which has the following beneficial effects:

[0015] This invention uses a fan and a separation box to separate heavier dust particles from flue gas. The baffle inside the separation box prevents the dust particles collected in the collection box from being continuously stirred up by the airflow caused by the fan. The screen can be used to separate lighter dust particles from the flue gas, and the screen can be easily replaced by the replacement mechanism. Attached Figure Description

[0016] Figure 1 This is a schematic diagram of the overall structure of the present invention;

[0017] Figure 2 This is a cross-sectional schematic diagram of the overall structure of this utility model;

[0018] Figure 3 This is a schematic diagram of a portion of the structure of this utility model;

[0019] Figure 4 This utility model Figure 3 A schematic diagram of the structure of A in the middle;

[0020] In the diagram: 1. Inlet pipe; 2. Separation box; 3. Fan; 4. Fixing frame; 5. Collection box; 6. Denitrification pipe; 7. Gas detector; 8. Three-way valve; 9. Exhaust pipe; 10. Return pipe; 11. Baffle; 12. Rewinding shaft; 13. Screen; 14. Through groove; 15. Elastic sealing strip; 16. Filter frame; 17. Handle; 18. Sealing sleeve; 19. Connecting sleeve. Detailed Implementation

[0021] The technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present invention.

[0022] This utility model provides a technical solution: such as Figures 1 to 4 As shown in this embodiment, a denitrification device for cement kiln flue gas includes an inlet pipe 1. One end of the inlet pipe 1 is connected to the flue gas outlet of the cement kiln, and the other end of the inlet pipe 1 is connected to a separation box 2. A fan 3 is provided between the separation box 2 and the inlet pipe 1. A collection box 5 is provided at the bottom of the separation box 2. A baffle 11 is fixedly installed on the inner wall of the separation box 2 near the inlet pipe 1. The baffle 11 is inclined downwards in the direction away from the inlet pipe 1. A denitrification pipe 6 is fixedly connected to the upper end of the separation box 2. A screen 13 is provided at the junction of the denitrification pipe 6 and the separation box 2. A replacement mechanism for the screen 13 is provided on the outer wall of the denitrification pipe 6. Multiple filter frames 16 are also provided inside the denitrification pipe 6 above the screen 13. SNCR denitrification catalyst is placed in the filter frames 16. A detection and reflux mechanism for the flue gas is provided at the top of the denitrification pipe 6.

[0023] Among them, a fixing frame 4 is fitted on the outer wall of the separation box 2 and the fixing frame 4 is fixedly connected.

[0024] The fixed frame 4 can support the separation box 2.

[0025] The bottom opening of the separation box 2 is fixedly installed with a connecting sleeve 19, and the inner wall of the collection box 5 is connected to the outer wall of the connecting sleeve 19 by a threaded connection.

[0026] This design allows for easy disassembly and assembly of collection box 5, making it convenient for staff to clean the smoke and dust inside.

[0027] The replacement mechanism includes two take-up shafts 12, which are symmetrically distributed on both sides of the denitrification pipe 6. Each end of the take-up shaft 12 is rotatably connected to a fixing plate, which is fixedly connected to the outer wall of the denitrification pipe 6. The two ends of the screen 13 pass through the through slots 14 opened on the two side walls of the denitrification pipe 6, and the two ends of the screen 13 are wound around the two take-up shafts 12.

[0028] In use, the unused portion of the screen 13 is wound onto one take-up shaft 12, and the used portion of the screen 13 is wound onto another take-up shaft 12. When the screen 13 laid in the denitrification pipe 6 begins to become clogged, the take-up shaft 12 with the used screen 13 wound on it is rotated to bring the screen 13 out of the denitrification pipe 6 and lay the new screen 13 back into the denitrification pipe 6, thus completing the replacement of the screen 13.

[0029] Elastic sealing strips 15 are fixedly installed on the upper and lower inner walls of the through groove 14, respectively.

[0030] The elastic sealing strip 15 can seal the through groove 14, and the elastic sealing strip 15 has a certain elasticity, which can ensure the free entry and exit of the screen 13.

[0031] The inner wall of the denitrification pipe 6 is provided with a groove that slides and fits with the filter frame 16. One end of the filter frame 16 slides through the side wall of the denitrification pipe 6, and a handle 17 is fixedly connected to the extended end of the filter frame 16.

[0032] By setting grooves on the inner wall of the denitrification pipe 6, the filter frame 16 can be slidably connected to the denitrification pipe 6.

[0033] A sealing sleeve 18 is fitted on the outer wall of the extended end of the filter frame 16.

[0034] The sealing sleeve 18 can block the gap between the filter frame 16 and the denitrification pipe 6, preventing flue gas leakage.

[0035] The detection and return mechanism consists of a gas detector 7, a three-way valve 8, an exhaust pipe 9, and a return pipe 10. The gas detector 7 is fixedly installed on the upper side of the side wall of the denitrification pipeline 6. The inlet of the gas detector 7 is in communication with the interior of the denitrification pipeline 6. The upper end of the denitrification pipeline 6 is fixedly connected to the three-way valve 8. The first outlet of the three-way valve 8 is fixedly connected to the exhaust pipe 9. The second outlet of the three-way valve 8 is fixedly connected to the return pipe 10. The other end of the return pipe 10 is in communication with the side wall of the inlet pipe 1.

[0036] During use, the flue gas after denitrification is detected by gas detector 7. If the detection result is qualified, turn the three-way valve 8 to discharge the flue gas from the exhaust pipe 9. If the detection result is unqualified, turn the three-way valve 8 to allow the flue gas to flow back to the intake pipe 1 through the return pipe 10 and perform denitrification again. If the gas detector 7 shows unqualified for a long time, the SNCR denitrification catalyst in the filter frame 16 needs to be replaced.

[0037] This utility model provides a denitrification device for cement kiln flue gas, the specific working principle of which is as follows:

[0038] During operation, the flue gas from the cement kiln enters the separation box 2 through the inlet pipe 1. Driven by the fan 3, the flue gas accelerates and flows to the inner wall of the separation box 2. Heavier dust particles fall into the collection box 5, while lighter dust particles enter the denitrification pipe 6 with the flue gas. The baffle 11 inside the separation box 2 partially blocks the opening of the collection box 5, preventing the collected dust particles from continuously rising due to the airflow caused by the fan 3. The baffle 11 is tilted to facilitate the downward sliding of dust particles that fall onto it. The lighter dust particles, after entering the denitrification pipe 6, are then... The flue gas is sieved through screen 13 in channel 6, which removes most of the dust. The flue gas then passes through the SNCR denitrification catalyst in filter frame 16, which removes the nitrate. The denitrified flue gas is then detected by gas detector 7. If the test result is qualified, the three-way valve 8 is turned to allow the flue gas to be discharged from exhaust pipe 9. If the test result is unqualified, the three-way valve 8 is turned to allow the flue gas to flow back to intake pipe 1 through return pipe 10 and undergo denitrification again. If gas detector 7 shows unqualified for a long time, the SNCR denitrification catalyst in filter frame 16 needs to be replaced.

[0039] Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A denitrification device for cement kiln flue gas, comprising an air inlet pipe (1), characterized in that: One end of the air inlet pipe (1) is connected to the smoke outlet of the cement kiln, and the other end of the air inlet pipe (1) is connected to the separation box (2). A fan (3) is provided between the separation box (2) and the air inlet pipe (1). A collection box (5) is provided at the bottom of the separation box (2). A baffle (11) is fixedly installed on the inner wall of the separation box (2) near the air inlet pipe (1). The baffle (11) is inclined downward in the direction away from the air inlet pipe (1). The upper end of the separation box (2) is fixed A denitrification pipe (6) is connected to the denitrification pipe (6). A screen (13) is provided at the junction of the denitrification pipe (6) and the separation box (2). A replacement mechanism for the screen (13) is provided on the outer wall of the denitrification pipe (6). Multiple filter frames (16) are also provided above the screen (13) inside the denitrification pipe (6). SNCR denitrification catalyst is placed in the filter frames (16). A detection and reflux mechanism for flue gas is provided at the top of the denitrification pipe (6).

2. The denitrification device for cement kiln flue gas according to claim 1, characterized in that: The outer wall of the separation box (2) is fitted with a fixing frame (4) and the fixing frame (4) is fixedly connected.

3. The denitrification device for cement kiln flue gas according to claim 1, characterized in that: A connecting sleeve (19) is fixedly installed at the bottom opening of the separation box (2), and the inner wall of the collection box (5) and the outer wall of the connecting sleeve (19) are connected by a threaded fit.

4. The denitrification device for cement kiln flue gas according to claim 1, characterized in that: The replacement mechanism includes two take-up shafts (12), which are symmetrically distributed on both sides of the denitrification pipe (6). Each end of the take-up shaft (12) is rotatably connected to a fixing plate, which is fixedly connected to the outer wall of the denitrification pipe (6). The two ends of the screen (13) pass through the through slots (14) opened on the two side walls of the denitrification pipe (6), and the two ends of the screen (13) are wound around the two take-up shafts (12).

5. The denitrification device for cement kiln flue gas according to claim 4, characterized in that: Elastic sealing strips (15) are fixedly installed on the upper and lower inner walls of the through groove (14).

6. The denitrification device for cement kiln flue gas according to claim 1, characterized in that: The inner wall of the denitrification pipe (6) is provided with a groove that slides and fits with the filter frame (16). One end of the filter frame (16) slides through the side wall of the denitrification pipe (6), and the extended end of the filter frame (16) is fixedly connected with a handle (17).

7. The denitrification device for cement kiln flue gas according to claim 1, characterized in that: A sealing sleeve (18) is fitted on the outer wall of the extended end of the filter frame (16).

8. The denitrification device for cement kiln flue gas according to claim 1, characterized in that: The detection and return mechanism consists of a gas detector (7), a three-way valve (8), an exhaust pipe (9), and a return pipe (10). The gas detector (7) is fixedly installed on the upper side of the side wall of the denitrification pipe (6). The inlet of the gas detector (7) is in communication with the interior of the denitrification pipe (6). The upper end of the denitrification pipe (6) is fixedly connected to the three-way valve (8). The first outlet of the three-way valve (8) is fixedly connected to the exhaust pipe (9). The second outlet of the three-way valve (8) is fixedly connected to the return pipe (10). The other end of the return pipe (10) is in communication with the side wall of the inlet pipe (1).

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