A boiler tube explosion detection alarm device

Abstract

The utility model belongs to boiler burst pipe detection technical field especially, it is a kind of detection alarm device of boiler burst pipe, including waste heat boiler, the bottom outer wall of waste heat boiler is provided with circulating gas pipeline, and the outer wall of circulating gas pipeline is provided with humidity detection subassembly, the outer wall of circulating gas pipeline top is located the one side of humidity detection subassembly and is provided with air duct, and the bottom of air duct outer wall is connected with gas plugging component. The utility model realizes real-time monitoring to the circulating gas humidity by humidity detection subassembly, can quickly capture the sharp rise of moisture after burst pipe, cooperate alarm and send alarm signal in time, solve the problem of traditional detection response lag, cylinder drive sealing gate open, and air draught fan starts and extracts leakage gas, nitrogen valve opens simultaneously, fills in inert nitrogen by nitrogen pipe, dilutes hydrogen and carbon monoxide concentration, helps to eliminate explosion hidden danger, convenient operation, effectively reduces the equipment damage after burst pipe.

Description

Technical Field

[0001] This utility model relates to the field of boiler tube rupture detection technology, and in particular to a boiler tube rupture detection alarm device. Background Technology

[0002] Dry quenching is a key process in the coking industry. It involves exchanging heat between inert gas and red-hot coke to quench the coke. This process recovers the sensible heat of the red-hot coke for power generation, reducing energy consumption, and also improves coke quality, reducing environmental pollutant emissions. It is widely used in steel and coking enterprises. In this process, the heated inert circulating gas enters a waste heat boiler, where it exchanges heat with boiler water to generate superheated steam, providing power for subsequent power generation. The stable operation of the entire system directly affects production efficiency and safety.

[0003] However, in actual operation, waste heat boilers face multiple risks of tube rupture, and existing technologies lack efficient detection and emergency response mechanisms. On the one hand, substandard feedwater quality leads to scaling and corrosion inside the tubes, and particulate matter in the circulating gas wears down the tube walls. Combined with the thermal stress under high temperature and pressure, this easily triggers boiler tube rupture. On the other hand, after a tube rupture, the circulating gas system will produce a large amount of hydrogen and carbon monoxide due to the water-gas reaction, posing an explosion hazard. Furthermore, the high temperature and pressure will exacerbate the damage to the boiler tubes. If the furnace cover is opened at this time, it will also cause equipment burnout, leading to a prolonged shutdown of the production line. Existing detection methods are slow to respond and cannot quickly locate tube rupture faults. Emergency response requires manual operation, which is inefficient and makes it difficult to prevent the danger from escalating. Utility Model Content

[0004] To address the shortcomings of existing technologies, this utility model provides a detection and alarm device for boiler tube rupture, which overcomes the deficiencies of existing technologies and effectively solves the problems of slow detection response, lack of automatic emergency handling mechanism, and easy explosion, equipment damage and production line shutdown after tube rupture.

[0005] To achieve the above objectives, the present invention adopts the following technical solution: A detection and alarm device for boiler tube rupture includes a waste heat boiler. A circulating gas pipeline is provided on the bottom outer wall of the waste heat boiler, and a humidity detection component is provided on the outer wall of the circulating gas pipeline. An induced draft pipe is provided on the top outer wall of the circulating gas pipeline to one side of the humidity detection component. A gas sealing component is connected to the bottom of the outer wall of the induced draft pipe. An induced draft fan is connected to the outer wall of the induced draft pipe above the gas sealing component. A nitrogen pipe is connected to the top of the outer wall of the induced draft pipe, and a nitrogen valve is installed on the outer wall of the nitrogen pipe.

[0006] Preferably, the humidity detection assembly includes an observation tube, an observation window, and a humidity detector. The observation tube is welded to the outer wall of one side of the circulating gas pipeline, the observation window is fixedly connected to the outer wall of one end of the observation tube via a flange, and the humidity detector with an alarm is inserted into the top outer wall of the observation tube.

[0007] Preferably, the gas sealing assembly includes a vent hood, a rectangular frame, a cylinder, and a sealing gate. The vent hood is connected to the outer wall of the exhaust pipe via a flange. The rectangular frame is disposed on one side of the vent hood. The cylinder is fixedly connected to the outer wall of one side of the rectangular frame by screws. The sealing gate is fixedly connected to the piston rod of the cylinder.

[0008] Preferably, the sealing gate is slidably engaged with the inner wall of the vent and the rectangular frame.

[0009] Preferably, an air inlet is provided at the top of one side of the outer wall of the waste heat boiler.

[0010] Preferably, a mounting frame is provided on one side of the waste heat boiler, and adjacent crossbeams are welded on the inner wall of the mounting frame. A clamp is fixedly connected to the top outer wall of the crossbeam, and the clamp is installed through the outside of the circulating gas pipeline.

[0011] Preferably, a PLC controller is placed on the top outer wall of the mounting bracket, and the PLC controller is connected to the humidity detector, cylinder, induced draft fan and nitrogen valve via signal lines.

[0012] The beneficial effects of this utility model are as follows: 1. The boiler tube rupture detection and alarm device designed in this paper realizes real-time monitoring of the humidity of circulating gas through a humidity detection component. It can quickly capture the sharp rise in moisture after tube rupture and issue an alarm signal in time in conjunction with the alarm, which solves the problem of delayed response of traditional detection. The observation tube is directly welded to the circulating gas pipeline to ensure that the detected gas is consistent with the gas in the pipeline. The observation window allows the staff to directly observe the situation inside the pipeline. This double guarantee ensures the accuracy of detection and avoids misjudgment and missed judgment. 2. When a boiler tube rupture detection and alarm device of this design occurs, the cylinder drives the sealing gate to open, the induced draft fan starts to extract the leaked gas, and at the same time the nitrogen valve opens, inert nitrogen is introduced through the nitrogen pipe to dilute the concentration of hydrogen and carbon monoxide, which helps to eliminate the explosion hazard. The device is easy to operate, effectively reduces equipment damage after a tube rupture, and shortens the downtime of the production line. Attached Figure Description

[0013] Figure 1 This is a schematic diagram of the overall structure of a boiler tube rupture detection and alarm device proposed in this utility model. Figure 2 for Figure 1 Enlarged schematic diagram of part A of the structure; Figure 3 This is a schematic diagram of the gas sealing component structure of a boiler tube rupture detection and alarm device proposed in this utility model; Figure 4 This invention relates to a detection and alarm device for boiler tube rupture, which illustrates the flow direction of boiler outlet gas after the circulating fan stops during dry quenching tube rupture.

[0014] In the diagram: 1. Waste heat boiler; 2. Circulating gas pipeline; 3. Humidity detection component; 31. Observation tube; 32. Observation window; 33. Humidity detector; 4. Exhaust duct; 5. Gas sealing component; 51. Vent hood; 52. Rectangular frame; 53. Cylinder; 54. Sealing gate; 6. Exhaust fan; 7. Nitrogen pipe; 8. Nitrogen valve; 9. Air inlet; 10. Mounting bracket; 11. Crossbeam; 12. Clamp; 13. PLC controller. Detailed Implementation

[0015] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present utility model. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments.

[0016] Reference Figures 1-4 Example 1: A detection and alarm device for boiler tube rupture includes a waste heat boiler 1. A circulating gas pipeline 2 is provided on the outer wall of the bottom of the waste heat boiler 1, and a humidity detection component 3 is provided on the outer wall of the circulating gas pipeline 2. The humidity detection component 3 includes an observation tube 31, an observation window 32, and a humidity detector 33. The observation tube 31 is welded to one side of the outer wall of the circulating gas pipeline 2, the observation window 32 is fixedly connected to one end of the outer wall of the observation tube 31 by a flange, and the humidity detector 33 with an alarm is inserted into the top outer wall of the observation tube 31.

[0017] In this embodiment, the observation tube 31 is made of 304 stainless steel with a diameter of DN50. Argon arc welding is used at the weld point with the circulating gas pipeline 2 to ensure a leak-free seal, allowing the humidity detector 33 to directly contact the circulating gas inside the pipeline. The detection probe of the humidity detector 33 extends to the center of the observation tube 31, with a detection range of 0-100%RH and an accuracy of ±2%RH. When the detected humidity exceeds a preset threshold (e.g., 50%RH), the built-in audible and visual alarm immediately activates, emitting a red warning light and an alarm sound of over 80dB. The flange of the observation window 32 is fixed to the observation tube 31 with bolts. Personnel can use the observation window 32 to check for abnormalities such as water droplets or mist inside the pipeline, aiding in the determination of whether a pipe burst has occurred.

[0018] In Example 2, an exhaust pipe 4 is provided on the top outer wall of the circulating gas pipeline 2, located on one side of the humidity detection component 3. A gas sealing component 5 is connected to the bottom of the outer wall of the exhaust pipe 4. An exhaust fan 6 is connected to the outer wall of the exhaust pipe 4 above the gas sealing component 5. A nitrogen pipe 7 is connected to the top of the outer wall of the exhaust pipe 4, and a nitrogen valve 8 is installed on the outer wall of the nitrogen pipe 7. The gas sealing component 5 includes a ventilation hood 51, a rectangular frame 52, a cylinder 53, and a sealing gate 54. The ventilation hood 51 is connected to the outer wall of the exhaust pipe 4 via a flange. The rectangular frame 52 is located on one side of the ventilation hood 51. The cylinder 53 is fixedly connected to the outer wall of one side of the rectangular frame 52 by screws. The sealing gate 54 is fixedly connected to the piston rod of the cylinder 53. The sealing gate 54 slides in cooperation with the inner walls of the ventilation hood 51 and the rectangular frame 52.

[0019] In this embodiment, the exhaust duct 4 is made of DN100 seamless steel pipe, with one end welded to the circulating gas pipeline 2 and the other end extending to the safe discharge area. The flange connecting it to the vent hood 51 has a pressure rating of PN1.6MPa to ensure reliable sealing under high pressure. In the gas sealing assembly 5, the inner wall of the vent hood 51 is provided with a guide groove, and the sealing gate 54 is made of wear-resistant cast iron with a polytetrafluoroethylene coating on the surface. It slides with the guide groove, providing excellent sealing performance. The cylinder 53 adopts a double-acting structure with a working pressure of 0.4-0.6MPa. After receiving the command from the PLC controller 13, the piston rod drives the sealing gate 54 to move rapidly, with an opening time of ≤2s. The exhaust fan 6 has a power of 3kW and a speed of 2900r / min. After starting, it can generate a negative pressure of 1500Pa to quickly extract the leaked gas in the circulating gas pipeline 2. Nitrogen valve 8 is a pneumatically controlled ball valve with a response time of ≤1s. Nitrogen pipe 7 is filled with nitrogen gas of ≥99.9% purity at a nitrogen filling pressure of 0.3-0.5MPa to dilute the concentration of hazardous gases.

[0020] An air inlet 9 is provided at the top of one side of the outer wall of the waste heat boiler 1.

[0021] According to the above scheme, after the circulating gas enters the waste heat boiler 1 through the gas inlet 9, it exchanges heat with the furnace tubes in the boiler to heat the boiler water into superheated steam, thereby realizing heat energy recovery. Then, it returns to the dry quenching furnace through the circulating gas pipeline 2 to complete the cycle.

[0022] A mounting bracket 10 is provided on one side of the waste heat boiler 1, and adjacent crossbeams 11 are welded to the inner wall of the mounting bracket 10. A clamp 12 is fixedly connected to the top outer wall of the crossbeam 11, and the clamp 12 passes through the outside of the circulating gas pipeline 2. A PLC controller 13 is placed on the top outer wall of the mounting bracket 10, and the PLC controller 13 is connected to the humidity detector 33, cylinder 53, induced draft fan 6 and nitrogen valve 8 through signal lines.

[0023] With the above-described scheme, the crossarm 11 is welded to the column of the mounting frame 10, firmly fixing the circulating gas pipeline 2 to the crossarm 11 to prevent the pipeline from shifting due to gas flow or equipment vibration. The PLC controller 13 adopts the S7-200 SMART model and is installed in a control box with an IP54 protection rating. It is connected to each device through shielded signal lines, and can receive the detection data from the humidity detector 33 in real time, and send control commands to the cylinder 53, the induced draft fan 6 and the nitrogen valve 8 according to the preset program.

[0024] Working Principle: This device is installed between the outlet of the waste heat boiler 1 and the secondary dust removal equipment. Its core function is to achieve rapid detection and risk control of boiler tube rupture through humidity monitoring and automatic emergency response linkage. During normal dry quenching production, the PLC controller 13 controls the cylinder 53 of the gas sealing component 5 to be in a contracted state. The sealing gate 54 tightly adheres to the inner wall of the ventilation hood 51 and the rectangular frame 52, sealing the inlet of the induced draft pipe 4. At this time, the induced draft fan 6 is not started, the nitrogen valve 8 on the nitrogen pipe 7 remains closed, and the circulating gas circulates normally through the circulating gas pipeline 2. The humidity detector 33 of the humidity detection component 3 continuously monitors the humidity of the circulating gas, and personnel can observe the condition inside the circulating gas pipeline 2 in real time through the observation window 32.

[0025] When a boiler tube ruptures, moisture leaks into the circulating gas, causing the humidity of the circulating gas to rise rapidly in a short period of time. When the humidity detector 33 detects that the humidity value exceeds the preset threshold, it immediately sends a signal to the PLC controller 13 and simultaneously activates its own alarm. After receiving the signal, the PLC controller 13 quickly determines that a tube rupture has occurred and immediately initiates the emergency procedure: the cylinder 53 extends its piston rod, causing the sealing gate 54 to slide open the inlet of the induced draft pipe 4; the induced draft fan 6 is started to extract the circulating gas containing a large amount of moisture and dangerous gases from the circulating gas pipeline 2 through the induced draft pipe 4 and guide it to a safe area; simultaneously, the nitrogen valve 8 is opened, and inert nitrogen is introduced into the induced draft pipe 4 and the circulating gas pipeline 2 through the nitrogen pipe 7 to dilute the concentration of hydrogen and carbon monoxide and eliminate the risk of explosion.

[0026] The above description is only a preferred embodiment of the present utility model, but the protection scope of the present utility model is not limited thereto. Any equivalent substitutions or changes made by those skilled in the art within the technical scope disclosed in the present utility model, based on the technical solution and the inventive concept of the present utility model, should be included within the protection scope of the present utility model.

Claims

1. A detection and alarm device for boiler tube rupture, comprising a waste heat boiler (1), characterized in that, The waste heat boiler (1) is provided with a circulating gas pipeline (2) on the bottom outer wall, and a humidity detection component (3) is provided on the outer wall of the circulating gas pipeline (2). An induced draft pipe (4) is provided on the top outer wall of the circulating gas pipeline (2) on one side of the humidity detection component (3). A gas sealing component (5) is connected to the bottom of the outer wall of the induced draft pipe (4). An induced draft fan (6) is connected to the outer wall of the induced draft pipe (4) above the gas sealing component (5). A nitrogen pipe (7) is connected to the top of the outer wall of the induced draft pipe (4), and a nitrogen valve (8) is installed on the outer wall of the nitrogen pipe (7).

2. The boiler tube rupture detection and alarm device according to claim 1, characterized in that, The humidity detection component (3) includes an observation tube (31), an observation window (32), and a humidity detector (33). The observation tube (31) is welded to the outer wall of one side of the circulating gas pipeline (2), the observation window (32) is fixedly connected to the outer wall of one end of the observation tube (31) by a flange, and the humidity detector (33) with an alarm is inserted into the top outer wall of the observation tube (31).

3. The boiler tube rupture detection and alarm device according to claim 1, characterized in that, The gas plugging assembly (5) includes a vent hood (51), a rectangular frame (52), a cylinder (53), and a sealing gate (54). The vent hood (51) is connected to the outer wall of the air duct (4) via a flange. The rectangular frame (52) is located on one side of the vent hood (51). The cylinder (53) is fixedly connected to the outer wall of one side of the rectangular frame (52) by screws. The sealing gate (54) is fixedly connected to the piston rod of the cylinder (53).

4. The boiler tube rupture detection and alarm device according to claim 3, characterized in that, The sealing gate (54) slides in contact with the inner wall of the ventilation hood (51) and the rectangular frame (52).

5. The boiler tube rupture detection and alarm device according to claim 1, characterized in that, An air inlet (9) is provided at the top of one side of the outer wall of the waste heat boiler (1).

6. The boiler tube rupture detection and alarm device according to claim 1, characterized in that, The waste heat boiler (1) is provided with a mounting frame (10) on one side, and adjacent crossbeams (11) are welded on the inner wall of the mounting frame (10). A clamp (12) is fixedly connected to the top outer wall of the crossbeam (11), and the clamp (12) is installed through the outside of the circulating gas pipeline (2).

7. The boiler tube rupture detection and alarm device according to claim 6, characterized in that, The mounting bracket (10) has a PLC controller (13) placed on its top outer wall, and the PLC controller (13) is connected to the humidity detector (33), cylinder (53), induced draft fan (6) and nitrogen valve (8) via signal lines.

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