Rapid hydrogen igniter device of dilute nitric acid oxidizing furnace

Abstract

The utility model relates to the technical field of dilute nitric acid production, in particular to a fast hydrogen igniter device of a dilute nitric acid oxidation furnace, which comprises an explosion-proof junction box, a special ignition cable and an igniter, the bottom of the explosion-proof junction box is fixedly connected with the special ignition cable, and the other end of the special ignition cable is fixedly connected with the igniter. A power line is fixedly connected to one side of the bottom of the igniter; one side of the explosion-proof junction box is fixedly connected with a pipeline, one end of the pipeline is fixedly connected with flange plates, and the flange plates are connected through screws. An ignition rod and a hydrogen pipeline which are distributed up and down are arranged in the pipeline, and a hydrogen valve is mounted on the outer side of the hydrogen pipeline; according to the utility model, the igniter is started, the ignition rod is used for ignition, the hydrogen valve is opened, the hydrogen is discharged, and ignition can be carried out in time, so that the hydrogen ignition speed is higher, the oxidation furnace can be ignited more quickly, the gas emptying time is short, and the environmental pollution is smaller.

Description

Technical Field

[0001] This utility model relates to the field of dilute nitric acid production technology, specifically to a rapid hydrogen igniter device for a dilute nitric acid oxidation furnace. Background Technology

[0002] Currently, most domestic dilute nitric acid production enterprises adopt a dual-pressure process, where gaseous ammonia reacts with oxygen in the air under low pressure to produce nitrogen oxides (using a platinum-rhodium-palladium ternary platinum mesh catalyst). These nitrogen oxides are then absorbed under pressure to form dilute nitric acid. During the start-up phase of the dilute nitric acid plant, the ternary platinum mesh in the oxidizer needs to be heated to a certain temperature using hydrogen ignition before the gaseous ammonia can complete the oxidation reaction with oxygen. However, existing hydrogen ignition methods are slow, resulting in a prolonged ignition time in the oxidizer. The release of large amounts of unreacted gas causes environmental pollution. Therefore, to address these issues, a rapid hydrogen igniter device for dilute nitric acid oxidizers is proposed. Utility Model Content

[0003] The purpose of this invention is to provide a rapid hydrogen igniter device for a dilute nitric acid oxidation furnace to solve the problems mentioned in the background art.

[0004] To achieve the above objectives, this utility model provides the following technical solution:

[0005] As an optional embodiment of the rapid hydrogen igniter device for a dilute nitric acid oxidation furnace described in this utility model, the device includes an explosion-proof junction box, a dedicated ignition cable, and an igniter.

[0006] The bottom of the explosion-proof junction box is fixedly connected to an ignition cable, and the other end of the ignition cable is fixedly connected to an igniter. A power cord is fixedly connected to one side of the bottom of the igniter.

[0007] A pipe is fixedly connected to one side of the explosion-proof junction box, and a flange is fixedly connected to one end of the pipe. The flanges are connected to each other by screws.

[0008] The pipeline is equipped with an ignition rod and a hydrogen pipeline arranged vertically inside, and a hydrogen valve is installed on the outside of the hydrogen pipeline.

[0009] Currently, most domestic dilute nitric acid production enterprises adopt a double-pressurization process, where gaseous ammonia reacts with oxygen in the air under low pressure to produce nitrogen oxides, which are then absorbed under pressure to form dilute nitric acid. During the start-up phase of the dilute nitric acid plant, the ternary platinum mesh in the oxidizer needs to be heated to a certain temperature using hydrogen ignition before the gaseous ammonia can complete its oxidation reaction with oxygen. However, existing hydrogen ignition methods are slow, resulting in a prolonged ignition time in the oxidizer and significant venting of unreacted gases, causing environmental pollution. This new design uses an external power supply and is started via an igniter. The ignition rod initiates the ignition action, at which point the hydrogen valve opens, releasing hydrogen for immediate ignition. This setup results in a faster hydrogen ignition time, allowing the oxidizer to ignite more quickly, with a shorter gas venting time, thus reducing environmental pollution.

[0010] As an optional embodiment of the rapid hydrogen igniter device for a dilute nitric acid oxidation furnace described in this utility model, wherein the ignition rod and the hydrogen pipeline are arranged in parallel.

[0011] This setup ensures that the hydrogen pipeline is horizontal, making the hydrogen flow smoother and ensuring the stability of the flow, which is essential for subsequent ignition.

[0012] As an optional embodiment of the rapid hydrogen igniter device for a dilute nitric acid oxidation furnace described in this utility model, a baffle is fixedly connected to the outer side of the other end of the ignition rod and the hydrogen pipeline, and the outer side of the baffle is fixedly connected to the inner wall of the pipeline.

[0013] As an optional embodiment of the rapid hydrogen igniter device for a dilute nitric acid oxidation furnace described in this utility model, the baffle is arranged in the form of a disc.

[0014] Baffles are installed inside the pipeline to prevent hydrogen from flowing back after it is discharged, which would affect the normal operation of downstream equipment.

[0015] As an optional embodiment of the rapid hydrogen igniter device for a dilute nitric acid oxidation furnace described in this utility model, the output end of the ignition rod is bent, and the output port of the ignition rod faces the output end of the hydrogen pipeline.

[0016] As an optional embodiment of the rapid hydrogen igniter device for a dilute nitric acid oxidation furnace described in this utility model, the ignition rod has a temperature resistance range of -60℃ to 1300℃.

[0017] As an optional embodiment of the rapid hydrogen igniter device for a dilute nitric acid oxidation furnace described in this utility model, the hydrogen pressure inside the hydrogen pipeline is between 0.4 MPa and 0.8 MPa.

[0018] This setup ensures that the flame faces the output end of the hydrogen pipeline, guaranteeing hydrogen ignition. The ignition rod is designed for a wide temperature range, making it less prone to damage. Furthermore, the high hydrogen pressure inside the pipeline ensures smooth hydrogen discharge and ignition.

[0019] Compared with the prior art, the beneficial effects of this utility model are:

[0020] This invention provides a rapid hydrogen igniter device for a dilute nitric acid oxidation furnace. When the igniter is activated, the ignition rod performs the ignition action. At this time, the hydrogen valve opens, hydrogen is released, and it can be ignited in time. This setting results in faster hydrogen ignition time, allowing the oxidation furnace to ignite more quickly. The gas venting time is short, thus reducing environmental pollution. Attached Figure Description

[0021] Figure 1 This is a schematic diagram of the overall structure of this utility model.

[0022] In the diagram: 1. Explosion-proof junction box; 2. Ignition cable; 3. Ignition device; 4. Power cord; 5. Hydrogen valve; 6. Pipeline; 7. Flange; 8. Ignition rod; 9. Hydrogen pipeline; 10. Baffle. Detailed Implementation

[0023] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0024] Example 1

[0025] Please see Figure 1 This utility model provides a technical solution:

[0026] A rapid hydrogen igniter device for a dilute nitric acid oxidation furnace includes an explosion-proof junction box 1, a dedicated ignition cable 2, and an igniter 3.

[0027] The bottom of the explosion-proof junction box 1 is fixedly connected to an ignition cable 2, and the other end of the ignition cable 2 is fixedly connected to an igniter 3. A power cord 4 is fixedly connected to one side of the bottom of the igniter 3.

[0028] A pipe 6 is fixedly connected to one side of the explosion-proof junction box 1, and a flange 7 is fixedly connected to one end of the pipe 6. The flanges 7 are connected to each other by screws.

[0029] The aforementioned pipe 6 is equipped with an ignition rod 8 and a hydrogen pipe 9 arranged vertically inside, and a hydrogen valve 5 is installed on the outside of the hydrogen pipe 9.

[0030] Currently, most domestic dilute nitric acid production enterprises adopt a double-pressure process, in which gaseous ammonia reacts with oxygen in the air under low pressure to produce nitrogen oxides. Using a platinum-rhodium-palladium ternary platinum mesh catalyst, the nitrogen oxides are then absorbed under pressure to form dilute nitric acid. During the start-up phase of the dilute nitric acid plant, the ternary platinum mesh in the oxidation furnace needs to be heated to a certain temperature by hydrogen ignition before the gaseous ammonia can complete the oxidation reaction with oxygen. However, the existing hydrogen ignition speed is slow, resulting in a long ignition time in the oxidation furnace. The large amount of unreacted gas released causes environmental pollution. This invention connects one end of the power cord 4 to an external power source and starts the process through the igniter 3. The ignition rod 8 performs the ignition action, at which time the hydrogen valve 5 opens, releasing hydrogen for immediate ignition. This setup results in a faster hydrogen ignition speed, allowing the oxidation furnace to ignite more quickly, with a shorter gas release time, thus reducing environmental pollution. The igniter uses an explosion-proof high-energy igniter, and the explosion-proof junction box 1 is made of stainless steel, providing excellent explosion-proof quality.

[0031] Example 2

[0032] This embodiment is an improvement upon embodiment 1. Please refer to [link / reference]. Figure 1 Specifically, the horizontal part of the ignition rod 8 and the hydrogen pipeline 9 are arranged in parallel.

[0033] This setup ensures that the hydrogen pipeline 9 is horizontal, making the hydrogen flow more stable, ensuring the stability of the flow, and ensuring the subsequent ignition work.

[0034] Example 3

[0035] This embodiment is an improvement upon embodiment 2. Please refer to [link / reference]. Figure 1 Specifically, a baffle 10 is fixedly connected to the outer side of the other end of the ignition rod 8 and the hydrogen pipeline 9, and the outer side of the baffle 10 is fixedly connected to the inner wall of the pipeline 6.

[0036] The aforementioned baffle 10 is arranged in the shape of a disc.

[0037] A baffle 10 is installed inside the pipeline 6 to prevent hydrogen from flowing back after being discharged and affecting the normal use of downstream equipment.

[0038] Example 4

[0039] This embodiment is an improvement upon embodiment 3. Please refer to [link / reference]. Figure 1 Specifically, the output end of the ignition rod 8 is bent, and the output port of the ignition rod 8 faces the output end of the hydrogen pipeline 9.

[0040] The temperature resistance range of the aforementioned ignition rod 8 is between -60℃ and 1300℃.

[0041] The internal hydrogen pressure of the aforementioned hydrogen pipeline 9 is between 0.4 MPa and 0.8 MPa.

[0042] This setup ensures that the flame faces the output end of the hydrogen pipeline 9, guaranteeing hydrogen ignition. At the same time, the ignition rod 8 has a wide temperature resistance range, making it less prone to damage. Furthermore, the high hydrogen pressure inside the hydrogen pipeline 9 ensures that the hydrogen can be smoothly discharged and ignited.

[0043] It should be noted that, in this document, relational terms such as "first" and "second" are used only to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such process, method, article, or apparatus.

[0044] 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 kind of dilute nitric acid oxidation furnace quick hydrogen igniter device, it is characterized by: Including explosion-proof terminal box (1), special cable line (2) and igniter (3), The bottom of the explosion-proof terminal box (1) is fixedly connected with the special cable line (2), and the other end of the special cable line (2) is fixedly connected with the igniter (3), and the bottom of the igniter (3) is fixedly connected with the power cord (4) on one side; One side of the explosion-proof terminal box (1) is fixedly connected with the pipeline (6), and one end of the pipeline (6) is fixedly connected with the flange (7), and the flange (7) is connected by screw; The inside of the pipeline (6) is provided with ignition rod (8) and hydrogen pipeline (9) in up and down distribution, and the outside of hydrogen pipeline (9) is installed with hydrogen valve (5).

2. A rapid hydrogen igniter device for a dilute nitric acid oxidation furnace according to claim 1, characterized in that: The horizontal part of the ignition rod (8) and the hydrogen pipeline (9) are arranged in parallel.

3. A rapid hydrogen igniter device for dilute nitric acid oxidation furnaces according to claim 1, characterized in that: The other end of the ignition rod (8) and the hydrogen pipeline (9) is fixedly connected with the baffle (10) outside, and the outer side of the baffle (10) is fixedly connected with the inner wall of the pipeline (6).

4. A rapid hydrogen igniter device for a dilute nitric acid oxidation furnace according to claim 3, characterized in that: The baffle (10) is disc-shaped.

5. A rapid hydrogen igniter device for dilute nitric acid oxidation furnaces according to claim 1, characterized in that: The output end of the ignition rod (8) is curved, and the output port of the ignition rod (8) faces the output end of the hydrogen pipeline (9).

6. A rapid hydrogen igniter device for dilute nitric acid oxidation furnaces according to claim 1, characterized in that: The temperature resistance range of the ignition rod (8) is between-60 ℃-1300 ℃.

7. A rapid hydrogen igniter device for dilute nitric acid oxidation furnaces according to claim 1 characterized in that: The hydrogen pressure range inside the hydrogen pipeline (9) is between 0.4MPa-0.8Mpa.

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