A gas nitriding device for deep-hole parts made of low-carbon steel

Abstract

This utility model belongs to the technical field of nitriding furnaces, specifically relating to a gas nitriding device for deep-hole parts made of low-carbon steel. It includes a cyclone separator and a tail gas treatment component for the nitriding device. This utility model first separates large particles from the nitrided tail gas using a cyclone separator. This ensures that the tail gas entering the reaction chamber may contain small amounts of oil or metal dust, which must be removed by "cyclone separation + filtration" to prevent clogging of the adsorbent, contamination of the absorbent liquid, or poisoning of the catalyst. Furthermore, through a reaction with oxygen and the catalyst at a certain temperature, the tail gas can be treated more thoroughly.

Description

Technical Field

[0001] This utility model belongs to the field of nitriding furnace technology, specifically relating to a gas nitriding device for deep-hole parts made of low-carbon steel. Background Technology

[0002] Gas nitriding involves placing parts in a sealed nitriding furnace and introducing nitrogen-containing media such as ammonia (NH3) at a high temperature of 500-580℃ (below the Ac1 phase transformation point of low-carbon steel, belonging to "low-temperature chemical heat treatment"). The ammonia decomposes upon heating, producing active nitrogen atoms. These nitrogen atoms penetrate the surface of the parts and combine with alloying elements in the steel (such as Cr, Mo, Al, etc., or with Fe if none are present) to form nitrides (such as Fe4N, Fe2N), thus forming a "nitrided layer" on the surface of the parts (composed of an outer compound layer and an inner diffusion layer), achieving the effect of "surface strengthening while maintaining the original properties of the core."

[0003] Publication (Announcement) No.: CN223324298U. This utility model relates to the field of exhaust gas treatment technology, specifically a gas nitriding furnace exhaust gas treatment device. It includes a shell, with two partitions fixedly connected inside the shell. These partitions divide the interior of the shell into a water chamber, a filter chamber, and a heating chamber arranged sequentially from bottom to top. The water chamber contains purified water, and a horizontally arranged air inlet pipe is fixedly connected to the inner wall of the water chamber. This gas nitriding furnace exhaust gas treatment device, by setting up the water chamber, filter chamber, and heating chamber, allows the gas to be fully mixed with the purified water, ensuring that ammonia gas fully contacts the water source, achieving a good purification effect. Furthermore, the filter plates can effectively filter carbon dioxide, ammonia, and sulfur dioxide in the gas, improving the filtration effect. The ammonia gas contained in the exhaust gas emitted by the gas nitriding furnace decomposes into hydrogen and nitrogen upon heating, which are then ignited at the exhaust pipe by an ignition device or manually, thereby purifying the exhaust gas emitted by the gas nitriding furnace and helping to reduce environmental pollution.

[0004] Analysis revealed that the proposed solution lacks a pretreatment process for the nitriding gas. The nitriding exhaust gas may contain small amounts of oil and metal dust (from the surface of parts), which need to be removed by certain methods to avoid clogging the adsorbent, contaminating the absorbent liquid, or poisoning the catalyst. To address these issues, the proposed solution needs to be optimized and improved. Utility Model Content

[0005] To address the problems existing in the background technology, this utility model provides a gas nitriding device for deep-hole parts made of low-carbon steel; it performs pretreatment by cyclone separation and makes the gas treatment more thorough by high-temperature reaction with oxygen.

[0006] This utility model provides a gas nitriding device for deep-hole parts made of low-carbon steel, including a cyclone separator and a tail gas treatment component for the nitriding device. The tail gas treatment component includes a support, on which a reaction frame is fixedly installed. A filter screen is inserted into the reaction frame. Purification liquid is provided inside the reaction frame and below the filter screen. Several positioning columns are uniformly fixedly installed inside the reaction frame and above the filter screen. Several ventilation holes are uniformly provided on the positioning columns. An opening and closing plate is provided on the reaction frame corresponding to the positioning columns. A catalytic column is inserted into the opening and closing plate. The catalytic column and the positioning column are fitted with a clearance. An oxygen pipe and an exhaust pipe are connected to the reaction frame. A reliable air inlet pipe is connected between the reaction frame and the cyclone separator. A spark plug is provided inside the reaction frame.

[0007] Furthermore, the reliable air intake pipe includes a main pipe that is interconnected with the reaction frame and the cyclone separator. A branch pipe is connected to the main pipe. A filter frame is provided between the main pipe and the branch pipe. A filter plate is inserted into the filter frame. A rising stem gate valve is symmetrically provided between the main pipe and the branch pipe with respect to the filter frame.

[0008] Furthermore, both the main pipeline and the oxygen pipeline are equipped with check valves.

[0009] Furthermore, a working platform is fixedly installed on the support corresponding to the reaction frame, a protective support is fixedly installed on the working platform, and a step is fixedly installed on one side of the working platform.

[0010] Furthermore, the catalyst column is specifically made of Co3O4-MnO2.

[0011] Furthermore, a control gripper is fixedly installed at one end of the catalytic column located on the opening and closing plate.

[0012] The beneficial effects of this utility model are: This invention first separates large particles from the nitrided exhaust gas using a cyclone separator. This prevents the nitrided exhaust gas from carrying small amounts of oil or metal dust (from the surface of parts) into the reaction chamber. These impurities are removed by "cyclone separation + filtration" to avoid clogging the adsorbent, contaminating the absorbent liquid, or poisoning the catalyst. Furthermore, the exhaust gas is treated more thoroughly through a reaction with oxygen and the catalyst at a certain temperature. Attached Figure Description

[0013] Figure 1 This is a left view of a gas nitriding device for a low-carbon steel deep-hole part according to the present invention.

[0014] Figure 2 This is a right view of a gas nitriding device for low-carbon steel deep-hole parts according to the present invention.

[0015] Figure 3 This is a schematic diagram of the reaction frame of a gas nitriding device for low-carbon steel deep-hole parts according to this utility model.

[0016] Figure 4 This is a schematic diagram of area A of a gas nitriding device for a low-carbon steel deep-hole part according to the present invention.

[0017] As shown in the figure: 1. Cyclone separator; 2. Support frame; 3. Reaction frame; 4. Filter screen; 5. Positioning column; 6. Vent hole; 7. Opening and closing plate; 8. Catalytic column; 9. Oxygen pipe; 10. Exhaust pipe; 11. Spark plug; 12. Main pipe; 13. Branch pipe; 14. Filter frame; 15. Filter plate; 16. Rising stem gate valve; 17. Check valve; 18. Working platform; 19. Protective support; 20. Step; 21. Control gripper. Detailed Implementation

[0018] 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.

[0019] In the description of this utility model, it should be noted that, unless otherwise explicitly specified and limited, the terms "installed," "equipped with," and "connected," etc., should be interpreted broadly. For example, "connected" can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium; it can be a connection within two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.

[0020] Please refer to the accompanying diagrams for all instruction manuals: A gas nitriding device for deep-hole parts made of low-carbon steel includes a cyclone separator 1 and a tail gas treatment component for the nitriding device. The tail gas treatment component for the nitriding device includes a support 2, a reaction frame 3 fixedly installed on the support 2, a filter screen 4 inserted into the reaction frame 3, a purification liquid located inside the reaction frame 3 and below the filter screen 4, a plurality of positioning columns 5 uniformly fixedly installed inside the reaction frame 3 and above the filter screen 4, a plurality of ventilation holes 6 uniformly provided on the positioning columns 5, an opening and closing plate 7 corresponding to the positioning columns 5 on the reaction frame 3, a catalytic column 8 inserted into the opening and closing plate 7, a clearance fit between the catalytic column 8 and the positioning column 5, an oxygen pipe 9 and an exhaust pipe 10 connected to the reaction frame 3, a reliable air inlet pipe connecting the reaction frame 3 and the cyclone separator 1, and a spark plug 11 located inside the reaction frame 3. As described above, the nitrided exhaust gas first enters the cyclone separator 1. After separation by the cyclone separator 1, it enters the reliable intake pipe. After filtration by the reliable intake pipe, it enters the reaction frame 3. After filtration by the purified liquid, it enters the combustion chamber containing the catalytic column 8. Oxygen is introduced into the combustion chamber through the oxygen pipe 9 and ignites the spark plug 11, causing combustion inside. The main reactions are... Ammonia: 4NH3 + 3O2 → (catalyst / heating) 2N2 + 6H2O Cyanide (HCN): 4HCN + 5O2 → (catalyst / heat) 4CO2 + 2N2 + 2H2O Catalysts (such as platinum, palladium, and copper oxide) are used to lower the combustion temperature of ammonia and cyanide, enabling them to decompose efficiently into harmless N2 and H2O at 200-400℃. At the same time, the heat of combustion of combustibles (such as H2) in the exhaust gas is used to maintain the reaction, resulting in low energy consumption. Finally, the treated exhaust gas is discharged through exhaust pipe 10.

[0021] As a technical optimization of this utility model, the reliable air intake pipe includes a main pipe 12 that is interconnected with the reaction frame 3 and the cyclone separator 1. A branch pipe 13 is connected to the main pipe 12. A filter frame 14 is provided between the main pipe 12 and the branch pipe 13. A filter plate 15 is inserted and connected in the filter frame 14. A rising stem gate valve 16 is symmetrically provided between the main pipe 12 and the branch pipe 13 with respect to the filter frame 14. As can be seen from the above description, the reliable intake pipe can ensure that after the filter plate 15 on one side of the pipe loses its effective filtering function, the corresponding rising stem gate valve 16 can be closed to quickly replace the filter plate 15 without affecting the operation of the cyclone separator 1.

[0022] As a technical optimization of this utility model, both the main pipeline 12 and the oxygen pipeline 9 are equipped with check valves 17; As can be seen from the above description, check valve 17 can effectively prevent gas backflow.

[0023] As a technical optimization of this utility model, a working platform 18 is fixedly installed on the support 2 corresponding to the reaction frame 3, a protective support 19 is fixedly installed on the working platform 18, and a step 20 is fixedly installed on one side of the working platform 18. As can be seen from the above description, the work platform 18 and the steps 20 facilitate workers to go up and down to work, and the protective bracket 19 provides a safe working environment.

[0024] As a technical optimization of this utility model, the catalyst column 8 is specifically made of Co3O4-MnO2; As can be seen from the above description, Co3O4-MnO2 is a spinel-type composite oxide with a stable crystal structure (spinel structure AB2O4), high temperature resistance to sintering, and uniform dispersion of active components. It is mainly used for the treatment of high-temperature industrial waste gas (such as tail gas from steel plants and power plants).

[0025] As a technical optimization of this utility model, a control gripper 21 is fixedly installed on one end of the catalytic column 8 at the opening and closing plate 7; As can be seen from the above description, the design of the control gripper 21 makes it convenient for staff to regularly maintain and service the catalyst column 8, remove the poisoned and deactivated catalyst column 8 from the reaction frame 3, and replace it with a new catalyst column 8.

[0026] The present invention and its embodiments have been described above. This description is not restrictive, and the specific embodiments shown are only one of the embodiments of the present invention. The actual structure is not limited to this. In short, if a person skilled in the art is inspired by this description and designs a similar structure and embodiment without departing from the inventive spirit of the present invention, such design should fall within the protection scope of the present invention.

Claims

1. A gas nitriding device for deep-hole parts made of low-carbon steel, comprising a cyclone separator and a tail gas treatment assembly for the nitriding device, characterized in that: The exhaust gas treatment component of the nitriding unit includes a support frame, on which a reaction frame is fixedly mounted. A filter screen is inserted into the reaction frame. Purification liquid is disposed inside the reaction frame and below the filter screen. Several positioning columns are uniformly fixedly mounted inside the reaction frame and above the filter screen. Several ventilation holes are uniformly disposed on the positioning columns. An opening and closing plate is disposed on the reaction frame corresponding to the positioning columns. A catalytic column is inserted into the opening and closing plate. The catalytic column and the positioning column are fitted with a clearance. An oxygen pipe and an exhaust pipe are connected to the reaction frame. A reliable air inlet pipe is connected between the reaction frame and the cyclone separator. A spark plug is disposed inside the reaction frame.

2. The gas nitriding device for low-carbon steel deep-hole parts according to claim 1, characterized in that: The reliable air intake pipe includes a main pipe that connects to the reaction frame and the cyclone separator. A branch pipe is connected to the main pipe. A filter frame is provided between the main pipe and the branch pipe. A filter plate is inserted into the filter frame. A rising stem gate valve is symmetrically provided between the main pipe and the branch pipe with respect to the filter frame.

3. The gas nitriding device for low-carbon steel deep-hole parts according to claim 2, characterized in that: Both the main pipeline and the oxygen pipeline are equipped with check valves.

4. The gas nitriding device for low-carbon steel deep-hole parts according to claim 1, characterized in that: A working platform is fixedly installed on the support corresponding to the reaction frame, a protective support is fixedly installed on the working platform, and a step is fixedly installed on one side of the working platform.

5. The gas nitriding device for low-carbon steel deep-hole parts according to claim 1, characterized in that: The catalyst column is specifically made of Co3O4-MnO2.

6. The gas nitriding device for low-carbon steel deep-hole parts according to claim 1, characterized in that: The catalytic column is fixedly installed with a control gripper at one end of the opening and closing plate.

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