A safety device for preventing flash explosion of a low-nitrogen combustion machine

Abstract

The utility model discloses a prevent low nitrogen combustion machine from happening flash -explosion's safety device, including the pipeline of taking combustion air pipe, gas pipe and ignition gas pipe, pipeline output end axial sliding connection shower nozzle, and connect the blow -off pipe of nitrogen gas pipeline and steam pipeline, pipeline output end both sides are equipped with flame detector, bottom is connected with the blowback pipe of inclined table and blow -off pipe, and the top of pipeline is equipped with thruster, and the guide structure of annular guide plate and cage -like guide frame is equipped between shower nozzle and pipeline, through double blow -off and clear up residual combustible gas, cooperate flame detection and avoid blind ignition, adjustable shower nozzle optimization ratio, reduce the flash -explosion risk from the source, adapt to yellow phosphorus tail gas combustion working condition, and the safety and adaptability are strong.

Description

Technical Field

[0001] This utility model relates to the technical field of yellow phosphorus tail gas safety treatment equipment, and in particular to a safety device for preventing flash explosions in low-NOx burners. Background Technology

[0002] After three-stage water washing, yellow phosphorus tail gas can be used in boilers or gas evaporators. To reduce nitrogen oxide emissions, many boilers or gas evaporators use low-NOx burners. During ignition, improper oxygen-air ratios or ignition gun malfunctions can prevent normal ignition. If ignition is attempted recklessly under these circumstances, a flash explosion is highly likely, posing a significant hazard to equipment and personnel. Summary of the Invention

[0003] The technical problem this invention aims to solve is that low-NOx burners are prone to flash explosions during secondary ignition, which can cause damage to equipment and people.

[0004] To solve the above-mentioned technical problems, the technical solution adopted by this utility model is: a safety device to prevent flash explosion of a low-NOx burner, including a combustion air pipe and a gas pipe connected to the pipeline, and an ignition gas pipe connected to the output end of the pipeline. A nozzle is axially slidably connected to the output end of the pipeline, and a purging pipe is also connected to the output end of the pipeline. A nitrogen pipeline and a steam pipeline are connected to the purging pipe.

[0005] Preferably, the nitrogen pipeline and the steam pipeline are connected to the purging pipe via a tee structure, and both the nitrogen pipeline and the steam pipeline are equipped with electrically controlled valves.

[0006] Preferably, a flame detector and an observation tube are connected to the output end of the pipeline, with the flame detector distributed on both sides of the pipeline.

[0007] Preferably, a thruster is connected to the top of the pipeline, the output end of the thruster is fixedly connected to the movable end of the nozzle, and a guide structure is provided between the nozzle and the pipeline.

[0008] Preferably, the guide structure includes an annular guide plate coaxially fixed to the end of the pipeline and a guide frame coaxially fixed to the outer wall of the nozzle. The guide plates are arranged in pairs, the guide frame is in the shape of a circular cage, and the edge ribs are axially slidably connected to the guide plates.

[0009] Preferably, a drain pipe is fixedly connected to the bottom of the outlet end of the pipeline, and an inclined platform is provided at the bottom inside the pipeline, with the top of the drain pipe connected to the bottom of the inclined platform.

[0010] Preferably, a backflush pipe is connected to the sewage pipe, and a valve is installed on the backflush pipe.

[0011] Preferably, an arc-shaped drain trough is fixedly connected to the top of the drain pipe, the top notch of the drain trough abuts against the bottom of the pipe, the drain trough is located between the two guide plates, and the opposite sidewalls of the drain trough are respectively fixedly connected to the two guide plates.

[0012] This invention provides a device to prevent flash explosions in low-NOx burners, which has the following beneficial effects.

[0013] 1. By installing a purging pipe connecting the nitrogen and steam lines at the pipeline output end, a dual safety purging mechanism is formed. When the low-NOx burner fails to ignite on the first attempt, the nitrogen or steam line can be opened via an electronically controlled valve to introduce inert gas or steam into the pipeline and combustion zone, quickly replacing the residual yellow phosphorus tail gas combustible medium and thoroughly removing the combustible gas mixture accumulated after ignition failure. Compared to traditional burners without a purging mechanism, this design eliminates the flash explosion triggering conditions of combustible gas encountering an ignition source during secondary ignition, significantly improving the safety of equipment ignition and operation, effectively protecting the equipment from damage, and ensuring the personal safety of operators.

[0014] 2. Flame detectors arranged on both sides of the pipeline output end can monitor the ignition status in real time and quickly provide feedback on whether the ignition is successful or not, providing accurate basis for starting the purging process and avoiding blind secondary ignition; at the same time, the propeller at the top of the pipeline, together with the guide structure between the nozzle and the pipeline, can realize flexible sliding adjustment of the nozzle along the axis. It can accurately adjust the nozzle spray position and flame coverage according to the flow rate, pressure characteristics and combustion requirements of the yellow phosphorus exhaust gas, optimize the mixing ratio of oxygen and fuel gas, reduce ignition failure caused by improper mixing, further reduce the risk of flash explosion, and adapt to the combustion requirements under different working conditions. Attached Figure Description

[0015] The present invention will be further described below with reference to the accompanying drawings and embodiments: Figure 1 This is a top view of an embodiment of the present utility model.

[0016] Figure 2 This is a front view of an embodiment of the present utility model.

[0017] Figure 3 This is a schematic diagram of the internal structure of the nozzle in an embodiment of this utility model.

[0018] Figure 4 This is a front view of the structure of the sewage tank in an embodiment of this utility model.

[0019] In the diagram: 1. Pipeline; 2. Combustion air duct; 3. Gas pipe; 4. Ignition gas pipe; 5. Nozzle; 6. Propeller; 7. Guide frame; 8. Guide plate; 9. Flame detector; 10. Observation tube; 11. Drainage trough; 12. Drainage pipe; 13. Sweeping pipe. Detailed Implementation

[0020] like Figure 1-4 As shown, this utility model provides a safety device to prevent flash explosion of a low-NOx burner, including a combustion air pipe 2 and a gas pipe 3 connected to a pipeline 1, and an ignition gas pipe 4 connected to the output end of the pipeline 1. A nozzle 5 is axially slidably connected to the output end of the pipeline 1, and a purging pipe 13 is also connected to the output end of the pipeline 1. A nitrogen pipeline and a steam pipeline are connected to the purging pipe 13.

[0021] A φ25 steel pipe is installed at the top of the existing low-NOx burner head in pipeline 1 as a purging pipe 13. Before igniting or re-igniting pipeline 1, nitrogen is connected to the purging pipe 13 to purge the gas inside the low-NOx burner head of pipeline 1 with nitrogen to reduce the gas concentration and prevent "flash explosion". When the nitrogen supply is insufficient, steam is used for operation.

[0022] In a preferred embodiment of this utility model, to facilitate the purging of gas inside pipeline 1, the nitrogen pipeline and the steam pipeline are connected to the purging pipe 13 via a tee structure, and both the nitrogen pipeline and the steam pipeline are equipped with electrically controlled valves. Operators can remotely control the opening of the electrically controlled valves on the nitrogen pipeline or the steam pipeline to purge the gas inside pipeline 1.

[0023] like Figure 1 and Figure 2 As shown. A flame detector 9 and an observation tube 10 are connected to the output end of the pipeline 1. The flame detector 9 is distributed on both sides of the pipeline 1. The flame detector 9 is used to detect the combustion status of the low-NOx burner inside the pipeline 1. A camera is connected to the observation tube 10 to capture images of the inside of the pipeline 1 and feed the information back to the remote control system, so that staff can obtain information about the inside of the pipeline 1.

[0024] like Figure 1 and Figure 2 As shown. A thruster 6 is connected to the top of the pipeline 1. The output end of the thruster 6 is fixedly connected to the movable end of the nozzle 5. A guide structure is provided between the nozzle 5 and the pipeline 1. The extension length of the nozzle 5 is controlled by the thruster 6, and the nozzle 5 moves axially along the pipeline 1. Operators adjust the position of the nozzle 5 according to the flow rate, pressure characteristics, and combustion requirements of the yellow phosphorus exhaust gas, ensuring that the nozzle spray position and flame coverage meet combustion requirements.

[0025] like Figure 1 and Figure 2As shown. The guiding structure includes an annular guide plate 8 coaxially fixed to the end of the pipeline 1 and a guide frame 7 coaxially fixed to the outer wall of the nozzle 5. The guide plates 8 are arranged in pairs, and the guide frame 7 is in the shape of a circular cage, with the edge ribs axially slidably connected to the guide plate 8. The guide frame 7 has annular plates at both ends, with ribs connecting the two annular plates. The ribs are distributed around the axis of the annular plates and are perpendicular to the annular plates. One end of the annular plate is fixedly connected to the nozzle 5, and the ribs pass through the guide plate 8. The guide plate 8 guides the movement of the guide frame 7 and the nozzle 5.

[0026] like Figure 2 and Figure 3 As shown. A drain pipe 12 is fixedly connected to the bottom of the output end of the pipe 1. An inclined platform is provided at the bottom of the inside of the pipe 1, and the top of the drain pipe 12 is connected to the bottom of the inclined platform. An arc-shaped inclined platform is provided at the bottom of the inside of the pipe 1. The end of the inclined platform near the port of the pipe 1 is lower than the other end, which guides the residual waste residue and condensate from combustion to flow to the bottom of the inclined platform. The drain pipe connected to the bottom of the inclined platform can discharge impurities.

[0027] As a preferred embodiment of this utility model, a backflush pipe is connected to the sewage pipe 12, and a valve is installed on the backflush pipe. An elbow is added to the sewage discharge section of the sewage pipe 12, and a backflush pipe is installed on the elbow. The backflush pipe is connected to the top section of the sewage pipe 12 and is used to sweep and blow the sewage pipe 12 to prevent the sewage pipe 12 from becoming blocked.

[0028] like Figure 3 and Figure 4 As shown. An arc-shaped drain trough 11 is fixedly connected to the top of the drain pipe 12. The top notch of the drain trough 11 abuts against the bottom of the pipeline 1. The drain trough 11 is located between two guide plates 8, and the opposite sidewalls of the drain trough 11 are respectively fixedly connected to the two guide plates 8. The paired guide plates 8 not only improve the stability of the guide frame 7 installation but also ensure the stability of the drain trough 11 installation. The top of the arc-shaped drain trough 11 can fit with the bottom of the pipeline 1, ensuring the bottom of the pipeline 1 is sealed while facilitating the flow of impurities into the drain trough 11. The stiffening plates in the guide frame 7 are distributed on both sides and the top of the guide plates 8. The stiffening plates do not penetrate the drain trough 11, ensuring the sealing of the drain trough 11 structure.

Claims

1. A safety device for preventing flash explosion in a low-NOx burner, characterized in that: It includes a combustion air pipe (2) and a gas pipe (3) connected to the pipeline (1) and an ignition gas pipe (4) connected to the output end of the pipeline (1). A nozzle (5) is axially slidably connected to the output end of the pipeline (1). A purging pipe (13) is also connected to the output end of the pipeline (1). A nitrogen pipeline and a steam pipeline are connected to the purging pipe (13).

2. The safety device for preventing flash explosion in a low-NOx burner as described in claim 1, characterized in that: The nitrogen pipeline and the steam pipeline are connected to the purging pipe (13) via a tee structure, and both the nitrogen pipeline and the steam pipeline are equipped with electrically controlled valves.

3. The safety device for preventing flash explosion in a low-NOx burner as described in claim 1, characterized in that: A flame detector (9) and an observation tube (10) are connected at the output end of the pipeline (1), with the flame detector (9) distributed on both sides of the pipeline (1).

4. The safety device for preventing flash explosion in a low-NOx burner as described in claim 1, characterized in that: The top of the pipeline (1) is connected to a thruster (6), the output end of the thruster (6) is fixedly connected to the movable end of the nozzle (5), and a guide structure is provided between the nozzle (5) and the pipeline (1).

5. The safety device for preventing flash explosion in a low-NOx burner as described in claim 4, characterized in that: The guide structure includes an annular guide plate (8) coaxially fixed to the end of the pipeline (1) and a guide frame (7) coaxially fixed to the outer wall of the nozzle (5). The guide plates (8) are arranged in pairs, the guide frame (7) is in the shape of a circular cage, and the ribs on the edge are axially slidably connected to the guide plate (8).

6. The safety device for preventing flash explosion in a low-NOx burner as described in claim 5, characterized in that: A drain pipe (12) is fixedly connected to the bottom of the output end of the pipe (1). An inclined platform is provided at the bottom of the inside of the pipe (1), and the top of the drain pipe (12) is connected to the bottom of the inclined platform.

7. The safety device for preventing flash explosion in a low-NOx burner as described in claim 6, characterized in that: A backflush pipe is connected to the sewage pipe (12), and a valve is installed on the backflush pipe.

8. The safety device for preventing flash explosion in a low-NOx burner as described in claim 6, characterized in that: The top end of the drain pipe (12) is fixedly connected to an arc-shaped drain trough (11). The top notch of the drain trough (11) abuts against the bottom of the pipe (1). The drain trough (11) is located between the two guide plates (8), and the opposite side walls of the drain trough (11) are fixedly connected to the two guide plates (8).

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