Integrated ignition gun of ammoxidation furnace

Abstract

The utility model discloses an ammoxidation furnace integrated burning torch, including ignition element, hydrogen pipe and junction box, ignition element includes current-conducting rod, insulating tube and support tube from inside to outside in proper order, the front end of current-conducting rod is connected with spark plug, the rear end is connected with spark plug joint, the front end of ignition element is fixed with support piece, the rear end of ignition element is fixed with the support piece. A supporting hole is formed in the supporting piece, the front end of the spark plug penetrates out of the supporting hole, a protection plate is arranged at the front end of the ignition element, a gap is formed between the protection plate and the front end of the spark plug, and a connecting plate is connected to the bottom of the protection plate and fixedly connected to the bottom of the supporting pipe. The end of the hydrogen pipe is provided with a nozzle arranged obliquely downwards, the nozzle faces the protection plate and the front end of the spark plug, and the lowest end of the nozzle exceeds the upper end of the protection plate. The hydrogen pipe and the igniter body are integrated together, and the nozzle obliquely faces the front end of the spark plug downwards, so that successful and rapid ignition is facilitated.

Description

Technical Field

[0001] The utility model relates to an integrated ignition gun for an ammonia oxidation furnace, specifically an ignition device for an ammonia oxidation furnace in the production process of nitric acid, belonging to the technical field of ammonia oxidation furnace ignition. Background Technique

[0002] In the process of producing nitric acid using an ammonia oxidation furnace, the ignition gun plays a crucial role during the furnace startup. Before starting the ammonia oxidation furnace, it is necessary to first use the ignition gun to ignite a small fire, and then use the small fire to ignite the large hydrogen pipe fire to activate the platinum mesh.

[0003] An ignition gun is arranged at the upper part of the ammonia oxidation furnace body, and the ignition gun is adjacent to the large hydrogen pipe, but a certain ignition distance needs to be ensured. The ignition gun is inserted obliquely into the ammonia oxidation furnace wall for a long time, with the ignition end of the ignition gun placed inside the ammonia oxidation furnace and the power connection end placed outside the ammonia oxidation furnace. The ignition gun of the existing ammonia oxidation furnace has a relatively complex transmission mechanism, which not only has a high cost, but also has the following problems:

[0004] Due to factors such as the insertion depth of the ignition gun, the ignition position, and space limitations, all will affect the ignition effect. The distance between the ignition end of the ignition gun and the large hydrogen pipe is very important. Currently, this distance is usually determined by the nitric acid process package provider. If the distance is too close, during the operation of the ammonia oxidation furnace, the ignition gun is affected by the high-temperature flue gas and undergoes thermal expansion, thus colliding with the large hydrogen pipe. Long-term collisions cause the large hydrogen pipe to deform, and it is easy to burn out the platinum mesh. If the distance is too far, the sparks at the ignition end of the ignition gun cannot ignite the large hydrogen pipe.

[0005] Since there are some impurities in the ammonia-air mixture, some viscous substances will accumulate on the ignition gun head and cannot be carried away. Over time, it will cause the small hydrogen pipe on the ignition gun to be blocked, resulting in the ignition gun being unable to work properly.

[0006] In a double-pressure or medium-pressure nitric acid system, during the operation of the ammonia oxidation furnace, since the flue gas pressure in the furnace is about 4 barg, due to the poor sealing between the ignition gun and the furnace wall surface, ammonia gas will leak through the connection between the ignition gun and the furnace body. The leaked ammonia gas will turn into nitric acid when it encounters a low-temperature environment, thus causing corrosion of the copper core of the cable at the power connection end of the ignition gun. Content of the Utility Model

[0007] The purpose of the utility model is to provide an integrated ignition gun for an ammonia oxidation furnace that is convenient to operate, ignites quickly and reliably, so as to solve the technical problems that the ignition device in the existing ammonia oxidation furnace has a relatively complex transmission mechanism, high cost, long ignition time, and is prone to accidents of burning out the platinum mesh.

[0008] The utility model adopts the following technical solution: an integrated ignition gun for an ammonia oxidation furnace, which comprises an ignition element, a hydrogen pipe and a junction box. The ignition element comprises a conductive rod, an insulating pipe and a support pipe which are arranged in sequence from inside to outside. The front end of the conductive rod is connected with a spark plug, and the rear end is connected with a spark plug connector. A support member is fixed at the front end of the ignition element. The front ends of the insulating pipe and the support pipe are both hermetically connected with the support member. The support member has a support hole inside, and the front end of the spark plug passes through the support hole. A protection plate is arranged at the front end of the ignition element, and there is a gap between the protection plate and the front end of the spark plug. The bottom of the protection plate is connected with a connecting plate, and the connecting plate is fixedly connected to the bottom of the support pipe. The hydrogen pipe is fixed on the upper part of the ignition element, and the end of the hydrogen pipe has a nozzle arranged obliquely downward, and the nozzle faces the protection plate and the front end of the spark plug, and the lowermost end of the nozzle exceeds the upper end of the protection plate.

[0009] The nozzle is an elbow pipe. After the elbow pipe deviates from the top of the ignition element, the end of the nozzle faces the front end of the spark plug.

[0010] The included angle between the end of the nozzle and the end face of the ignition element is 30°-45°; the included angle between the end of the nozzle and the vertical section of the ignition element is 45°.

[0011] The main body of the hydrogen pipe is spot-welded and fixed to fit on the upper surface of the support pipe; the hydrogen pipe and the support pipe are provided with a housing that surrounds the hydrogen pipe and the support pipe, and the housing is hermetically fitted with the wall surface of the ammonia oxidation furnace.

[0012] The distance between the lowermost end of the nozzle and the axis of the ignition element is 10-15 mm.

[0013] The distance between the lowermost end of the nozzle and the axis of the ignition element is 12 mm.

[0014] An insulating layer is arranged on the outer surface of the conductive rod, and the insulating layer is attached to the outer surface of the conductive rod.

[0015] Both the insulating layer and the insulating pipe are made of ceramics; the support pipe is a stainless steel pipe; the conductive rod is a round steel. The spark plug is threadedly connected to the front end of the conductive rod, and the spark plug connector is threadedly connected to the rear end of the conductive rod.

[0016] A sealing member is arranged at the rear end of the support pipe, and the conductive rod passes through the rear end of the sealing member in a sealed manner and is connected with the spark plug connector.

[0017] The sealing member comprises a sealing gasket and a sealing cover. The sealing cover is connected to the rear end of the support pipe. The inner side of the sealing cover has an annular boss. The two sides of the annular boss are respectively and hermetically fitted with the inner wall of the support pipe and the outer wall of the insulating pipe. The sealing gasket is located between the rear end face of the insulating pipe and the inner side of the sealing cover, and the outer peripheral surface of the sealing gasket is hermetically fitted with the inner peripheral surface inside the annular boss.

[0018] The beneficial effects of the present utility model are as follows: The present utility model integrates the hydrogen gas pipe and the ignition device body, which can make the ignition operation more convenient. A protective plate is provided at the front end of the ignition device body, and the nozzle is located between the protective plate and the spark plug. The protective plate not only protects the ignition, avoiding damage to components such as the large hydrogen gas pipe and the platinum mesh, but also can limit the distance between the nozzle and the spark plug. The nozzle is inclined downward towards the front end of the spark plug, so that a proper distance and angle are maintained between the nozzle and the spark plug, which is conducive to successful and rapid ignition. Moreover, the nozzle is inclined downward, avoiding the accumulation of impurities in the ammonia-air mixture and preventing the nozzle from being blocked. The present utility model integrates the small hydrogen gas pipe on the ignition device body, saving space, being convenient to operate, having rapid and reliable ignition, and solving the technical problems of the ignition device in the existing ammonia oxidation furnace, such as having a relatively complex transmission mechanism, high cost, long ignition time, and being prone to accidents of burning out the platinum mesh.

[0019] In the preferred solution, since the direction and position of the nozzle are obtained through design and usage experience, it is of great significance for successful ignition.

[0020] In the preferred solution, by sealing the outer shell with the wall surface of the ammonia oxidation furnace, ammonia leakage can be prevented, avoiding the influence on components such as cables.

[0021] In the preferred solution, the spark plug is threadedly connected to the conductive rod, and the spark plug can be replaced with a special tool, which is more economical for the vulnerable part, the spark plug. Description of the Drawings

[0022] Figure 1 is a schematic structural diagram of an integrated ignition gun for an ammonia oxidation furnace according to an embodiment of the present utility model;

[0023] Figure 2 is Figure 1 the view in the B direction in

[0024] Figure 3 is Figure 1 the usage state diagram of the integrated ignition gun for the ammonia oxidation furnace of

[0025] In the figure: 1 - ignition element, 1.1 - conductive rod, 1.2 - insulating tube, 1.3 - support tube, 1.4 - spark plug, 1.5 - spark plug joint, 1.6 - support member, 1.7 - sealing cover, 1.8 - sealing gasket, 1.9 - insulating layer, 2 - hydrogen gas pipe, 2.1 - nozzle, 2.2 - union joint, 3 - junction box, 3.1 - cable, 3.2 - cable gland, 4 - protective plate, 4.1 - connecting plate, 5 - outer shell. Detailed Embodiments

[0026] The present utility model will be described in detail below with reference to the drawings and specific embodiments.

[0027] The structure of an integrated ignition gun for an ammonia oxidation furnace according to an embodiment of the present utility model is as follows Figures 1 to 2 As shown, the integrated ignition gun for the ammonia oxidation furnace in this embodiment includes an ignition element 1, a hydrogen gas pipe 2, and a junction box 3. The ignition element 1 includes a conductive rod 1.1, an insulating pipe 1.2, and a support pipe 1.3 arranged in sequence from the inside to the outside. The front end of the conductive rod 1.1 is connected to a spark plug 1.4, and the rear end is connected to a spark plug connector 1.5. A cable gland 3.2 is provided on the junction box 3, and a cable 3.1 is provided inside the junction box 3. The two ends of the cable 3.1 are respectively connected to the spark plug connector 1.5 and the cable gland 3.2.

[0028] A support member 1.6 is fixed at the front end of the ignition element 1. The front ends of the insulating pipe 1.2 and the support pipe 1.3 are both hermetically connected to the support member 1.6. The support member 1.6 has a support hole inside, and the front end of the spark plug 1.4 passes through the support hole. A protective plate 4.1 is provided at the front end of the ignition element 1. There is a gap between the protective plate 4.1 and the front end of the spark plug 1.4. The bottom of the protective plate 4.1 is connected to a connecting plate 4.2, and the connecting plate 4.2 is fixedly connected to the bottom of the support pipe 1.3. The hydrogen gas pipe 2 is fixed above the ignition element 1. In this embodiment, the main body of the hydrogen gas pipe 2 is spot-welded and fixed to fit on the upper surface of the support pipe 1.3. The end of the hydrogen gas pipe 2 has a nozzle 2.1 arranged obliquely downward, and the nozzle 2.1 faces the protective plate 4 and the front end of the spark plug 1.4. The lowest end of the nozzle 2.1 exceeds the upper end of the protective plate 4. The distance between the lowest end of the nozzle 2.1 and the axis of the ignition element is 10 - 15 mm. In a preferred solution, the distance between the lowest end of the nozzle 2.1 and the axis of the ignition element 1 is 12 mm.

[0029] The nozzle 2.1 is an elbow pipe. After the elbow pipe 2.1 deviates from the top of the ignition element 1, the end of the nozzle 2.1 faces the front end of the spark plug 1.4. The angle between the end of the nozzle 2.1 and the end face of the ignition element 1 is 30° - 45°; the angle between the end of the nozzle 2.1 and the vertical cross-section of the ignition element 1 is 45°.

[0030] An insulating layer 1.9 is provided on the outer surface of the conductive rod 1.1, and the insulating layer 1.9 fits on the outer surface of the conductive rod 1.1. Both the insulating layer 1.9 and the insulating pipe 1.2 are made of ceramics; the support pipe 1.3 is a stainless steel pipe. The conductive rod 1.1 is a round steel. The spark plug 1.4 is threadedly connected to the front end of the conductive rod 1.1, and the spark plug connector 1.5 is threadedly connected to the rear end of the conductive rod 1.1. The main body of the hydrogen gas pipe 2 is spot-welded and fixed to fit on the upper surface of the support pipe. An outer shell 5 that surrounds the hydrogen gas pipe and the support pipe is provided outside the hydrogen gas pipe 2 and the support pipe 1.3, and the outer shell 5 is hermetically fitted with the wall surface of the ammonia oxidation furnace.

[0031] A seal is provided at the rear end of the support tube 1.3. The conductive rod 1.1 passes through the rear end of the seal in a sealed manner and is connected to the spark plug connector 1.5. The seal includes a gasket 1.8 and a seal cover 1.7. The seal cover 1.7 is connected to the rear end of the support tube 1.3. The inner side of the seal cover 1.7 has an annular boss. The two sides of the annular boss are respectively in sealed cooperation with the inner wall of the support tube 1.3 and the outer wall of the insulating tube 1.2. The gasket 1.8 is located between the rear end face of the insulating tube 1.2 and the inner side of the seal cover 1.7, and the outer peripheral surface of the gasket 1.8 is in sealed cooperation with the inner peripheral surface inside the annular boss.

[0032] The integrated ignition gun of the present utility model has a compact structure. The front end of the spark plug is fixed by a support. The conductive rod is a round steel. The rear part of the conductive rod passes through the seal and is connected to the spark plug connector by a thread. The outer side of the conductive rod is insulated by two ceramic layers. The outermost support tube is a stainless steel tube, which plays a reinforcing role. The front end of the hydrogen tube is provided with a nozzle, and the rear end is connected with a union joint.

[0033] As Figure 3 shown, the ignition element is obliquely inserted into the burner head of the ammonia oxidation furnace. One end of the ignition gun located inside the ammonia oxidation furnace is the ignition side, and the end located outside the ammonia oxidation furnace is the power connection side. The hydrogen tube is spot-welded to the ignition element. The axial distance between the nozzle of the hydrogen tube and the end of the spark plug is 12 mm, and a certain hydrogen injection angle is formed. The power connection side of the ignition element and the spark plug connector are both located inside the junction box.

[0034] The use process of the present utility model is as follows: 1. Connect the power supply of the electronic igniter, open the valve on the hydrogen tube, and hydrogen enters at a pressure greater than the internal operating pressure of the ammonia oxidation furnace by 0.05 MPa. The DC electrode of the electronic igniter discharges to generate a spark to ignite the hydrogen, and then disconnect the power supply of the electronic igniter.

[0035] 2. Before each ignition, first tighten the spark plug of the ignition gun, and the nozzle needs to be designed as a long round hole.

[0036] 3. Since the insertion depth of the ignition gun, the ignition position and space limitations, and the direction of spark splashing may all affect the ignition effect, therefore, after multiple horizontal, vertical, and rotational adjustments and angle changes, mark the positions where ignition is successful multiple times as the reference points for future ignition operations.

[0037] During each maintenance, synchronously maintain all quick cut-off valves and regulating valves. Blow the pipeline before starting and stopping the furnace each time. Before each ignition, individually confirm the action sensitivity and opening and closing degrees of all three-valve groups for each single valve, and then conduct a linkage confirmation. Through the above three links, ensure that each valve is convenient, flexible, correctly linked, and executed in place during ignition.

[0038] Since the ignition effect may be affected by the insertion depth of the ignition gun, the ignition position and space limitations, as well as the direction of spark splashing, in the present utility model, the relative positions of the ignition gun and the large hydrogen pipe are determined based on years of design and use experience, which is of great significance for successful ignition.

Claims

1. An integrated ignition gun for an ammonia oxidation furnace, which comprises an ignition element, a hydrogen gas pipe and a junction box. The ignition element includes a conductive rod, an insulating tube and a support tube which are arranged in sequence from the inside to the outside. The front end of the conductive rod is connected with a spark plug, and the rear end is connected with a spark plug connector. It is characterized in that: A support is fixed to the front end of the ignition element. The front ends of the insulating tube and the support tube are both hermetically connected to the support. There is a support hole inside the support, and the front end of the spark plug passes through the support hole. A protective plate is provided at the front end of the ignition element, and there is a gap between the protective plate and the front end of the spark plug. The bottom of the protective plate is connected to a connecting plate, and the connecting plate is fixedly connected to the bottom of the support tube. The hydrogen gas tube is fixed to the upper part of the ignition element, and the end of the hydrogen gas tube has a nozzle arranged obliquely downward, and the nozzle faces the protective plate and the front end of the spark plug, and the lowermost end of the nozzle exceeds the upper end of the protective plate.

2. The integrated ignition gun for ammonia oxidation furnace according to claim 1, wherein: The nozzle is an elbow tube. After the elbow tube deviates from the top of the ignition element, the end of the nozzle faces the front end of the spark plug.

3. The integrated igniter for ammonia oxidation furnace according to claim 1, characterized in that: The included angle between the end of the nozzle and the end face of the ignition element is 30°-45°; the included angle between the end of the nozzle and the vertical section of the ignition element is 45°.

4. The integrated ignition gun for ammonia oxidation furnace according to claim 1, wherein: The main body of the hydrogen gas tube is spot-welded and fixed to fit on the upper surface of the support tube; the hydrogen gas tube and the support tube are provided with a housing that surrounds the hydrogen gas tube and the support tube, and the housing is hermetically fitted with the wall surface of the ammonia oxidation furnace.

5. The integrated ignition gun for ammonia oxidation furnace according to claim 1, characterized in that: The distance between the lowermost end of the nozzle and the axis of the ignition element is 10-15 mm.

6. The integrated ignition gun for ammonia oxidation furnace according to claim 5, characterized in that: The distance between the lowermost end of the nozzle and the axis of the ignition element is 12 mm.

7. The integrated ignition gun for ammonia oxidation furnace according to claim 1, characterized in that: An insulating layer is provided on the outer surface of the conductive rod, and the insulating layer fits on the outer surface of the conductive rod.

8. The integrated ignition gun for ammonia oxidation furnace according to claim 7, characterized in that: Both the insulating layer and the insulating tube are made of ceramic; the support tube is a stainless steel tube; the conductive rod is a round steel, the spark plug is threadedly connected to the front end of the conductive rod, and the spark plug connector is threadedly connected to the rear end of the conductive rod.

9. The integrated igniter for ammonia oxidation furnace according to claim 1, characterized in that: A seal is provided at the rear end of the support tube, and the conductive rod passes through the rear end of the seal hermetically and is connected to the spark plug connector.

10. The integrated igniter for ammonia oxidation furnace according to claim 9, characterized in that: The seal includes a gasket and a seal cover. The seal cover is connected to the rear end of the support tube. There is an annular boss inside the seal cover. The two sides of the annular boss are hermetically fitted with the inner wall of the support tube and the outer wall of the insulating tube respectively. The gasket is located between the rear end face of the insulating tube and the inside of the seal cover, and the outer peripheral surface of the gasket is hermetically fitted with the inner peripheral surface inside the annular boss.

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