A waste gas treatment device for a gas nitriding furnace

Abstract

This utility model discloses a waste gas treatment device for a gas nitriding furnace, including a support leg, a spray tank fixedly connected to the support leg, a combustion chamber fixedly connected to one side of the support leg, a burner fixedly connected to the combustion chamber, an ignition burner fixedly connected to the combustion chamber, a connecting pipe 1 connecting to the waste gas outlet of the deep nitriding furnace, a three-way valve connected to the connecting pipe 1, a connecting pipe 2 connecting the three-way valve to the burner, a connecting pipe 3 connecting the three-way valve, a gas distribution plate fixedly connected to the spray tank, a connecting pipe 3 connecting to the gas distribution plate, and a water inlet pipe and a spray plate fixedly connected to the spray tank. Through the coordinated operation of the three-way valve and the pressure stabilizing valve, the treatment path is intelligently switched according to the ammonia concentration of the waste gas: at low concentrations, the waste gas enters the spray tower for neutralization; at high concentrations and when ignitable, it switches to the combustion chamber for complete decomposition. This design eliminates the risk of ammonia leakage due to ignition failure in the initial stage or during concentration fluctuations.

Description

Technical Field

[0001] This utility model relates to the field of waste gas treatment technology for gas nitriding furnaces, and more specifically, it relates to a waste gas treatment device for gas nitriding furnaces. Background Technology

[0002] Nitriding is a key heat treatment process for improving the surface properties of workpieces. It is achieved by infiltrating nitrogen atoms into the surface layer of the workpiece at a specific temperature. Nitrided workpieces possess excellent wear resistance, fatigue resistance, corrosion resistance, and high-temperature resistance. This process typically involves introducing ammonia gas into a nitriding furnace, using heating to promote its decomposition and complete the infiltration of nitrogen.

[0003] Currently, the common method for treating exhaust gases is by igniting them; however, this method has the following problems: 1. When ammonia is first introduced, the decomposition rate is low. On the one hand, the amount of combustion-supporting gas decomposed is less than that of hydrogen and more than that of inert gas. On the other hand, the pressure of the natural gas supporting ammonia combustion is low. As a result, during the initial introduction of ammonia, the automatic ignition device cannot ignite the ammonia and other waste gases discharged from the exhaust port. The waste gases cannot be discharged after combustion, and the ammonia gas leaks directly into the plant, ultimately causing the ammonia concentration in the plant to rise instantaneously.

[0004] 2. In the waste gas scrubbing purification process, the actual effective contact time between the waste gas and the treatment liquid is too short. This results in ammonia molecules in the waste gas not fully dissolving or reacting completely with the treatment liquid before being discharged. Therefore, a high concentration of ammonia pollutants remains in the purified waste gas, failing to meet the established environmental emission standards.

[0005] 3. Existing spray towers use a bottom-up flow pattern for waste gas, while the treatment liquid is typically sprayed from top to bottom. This co-current or non-ideal counter-current design weakens the heat exchange intensity between the gas and liquid. The waste gas cannot be effectively cooled by the treatment liquid in a timely manner, resulting in a higher waste gas temperature. High temperature not only reduces the solubility of ammonia in the treatment liquid but also slows down the chemical reaction rate, ultimately significantly weakening the overall ammonia removal effect of the spray system.

[0006] Therefore, there is an urgent need for a waste gas treatment device for gas nitriding furnaces. Utility Model Content

[0007] (a) Technical problems to be solved In view of the problems existing in the prior art, the present invention provides a waste gas treatment device for a gas nitriding furnace to solve the technical problems mentioned in the background art.

[0008] (II) Technical Solution To achieve the above objectives, this utility model provides the following technical solution: a waste gas treatment device for a gas nitriding furnace, comprising a support leg, a spray vessel fixedly connected to the support leg, a combustion chamber fixedly connected to one side of the support leg, a burner fixedly connected to the combustion chamber, an ignition burner fixedly connected to the combustion chamber, a connecting pipe one connecting to the waste gas outlet of the deep nitriding furnace, a three-way valve connected to the connecting pipe one, a connecting pipe two connecting between the three-way valve and the burner, a pressure stabilizing and maintaining valve fixedly connected to the connecting pipe two, a connecting pipe three connecting to the three-way valve, a gas distribution plate fixedly connected to the spray vessel, a water inlet pipe and a spray plate fixedly connected to the spray vessel, the water inlet pipe connecting to the spray plate, and a drain pipe and a gas outlet pipe fixedly connected to both the upper and lower sides of the spray vessel.

[0009] The present invention is further configured such that a fixing plate is fixedly connected to the inner wall of the spraying vessel, the fixing plate is embedded with fixing tubes distributed at equal intervals in the circumferential direction, a fixing member is fixedly connected inside the fixing tube, the fixing member is slidably connected to a sliding rod, and the sliding rod is fixedly connected to a liquid-blocking cap.

[0010] The present invention is further configured such that a gap is provided between the liquid-blocking cap and the adjacent fixed tube, and the lowest side of the liquid-blocking cap is lower than the upper side of the fixed tube.

[0011] The present invention is further configured such that a spring is fixedly connected between the sliding rod and the fixing member.

[0012] The present invention is further configured such that a motor is fixedly connected to the bottom of the spraying vessel, the output of the motor passes through the fixed plate, and a stirring element is fixedly connected to the output end of the motor.

[0013] The present invention is further configured such that a support mesh is fixedly connected to the inner wall of the spraying vessel, two sponge blocks are provided on the support mesh, a fixed column is embedded in the middle of the support mesh, a rotating rod is rotatably connected to the fixed column, and the rotating rod is provided with a spline.

[0014] The present invention is further configured such that the rotating rod is splinedly connected to a splined cylinder, the splined cylinder is rotatably connected to two extrusion rollers, and an elastic element is fixedly connected between the fixed column and the splined cylinder, which is part of the spraying kettle.

[0015] The present invention is further configured such that a second motor is fixedly connected to the top of the spraying vessel, the output shaft of the second motor is fixedly connected to the rotating rod, and two support blocks are fixedly connected between the two sponge blocks.

[0016] (III) Beneficial Effects Compared with the prior art, this utility model provides a waste gas treatment device for a gas nitriding furnace, which has the following beneficial effects: 1. This utility model utilizes a three-way valve and a pressure-stabilizing valve in synergy to intelligently switch the treatment path based on the ammonia concentration in the waste gas: when the concentration is low, the waste gas enters the spray tower for neutralization; when the concentration is high and flammable, it switches to the combustion chamber for complete decomposition. This design eliminates the risk of ammonia leakage due to ignition failure in the initial stage or during concentration fluctuations, ensuring safety and environmental compliance.

[0017] 2. This invention employs a fixed plate liquid film layer, a liquid-blocking cap gap that can adaptively adjust its opening according to air pressure, a stirring component to maintain liquid film activity, and a sponge block for secondary adsorption. The waste gas is forced to contact the treated liquid multiple times and for extended periods, greatly improving ammonia neutralization efficiency and waste gas temperature reduction.

[0018] 3. This invention periodically rolls and squeezes the saturated treatment liquid sponge block to discharge the waste liquid and restore its porous liquid absorption structure. This design ensures that the sponge block always has efficient gas-liquid dispersion and reaction capabilities, avoiding the clogging or failure problems of traditional fillers and ensuring the long-term stable operation of the spray system. Attached Figure Description

[0019] Figure 1 This is a front structural schematic diagram of a waste gas treatment device for a gas nitriding furnace according to the present invention. Figure 2 This is a schematic diagram of the structure of the burner and ignition burner in this utility model; Figure 3 This is a cross-sectional view of the spraying vessel in this utility model; Figure 4 This is a schematic diagram of the structure of the fixing plate and the stirring component in this utility model; Figure 5 This is a cross-sectional view of the fixing tube and the liquid-blocking cap in this utility model; Figure 6 This is a schematic diagram of the structure of the sponge block and splined cylinder in this utility model; Figure 7 This is a schematic diagram of the extrusion roller and support block in this utility model.

[0020] In the diagram: 1. Support leg; 2. Spraying vessel; 3. Combustion chamber; 4. Burner nozzle; 5. Ignition burner; 6. Connecting pipe one; 7. Three-way valve; 8. Connecting pipe two; 9. Pressure stabilizing and maintaining valve; 10. Connecting pipe three; 11. Gas distribution plate; 12. Spraying plate; 13. Water inlet pipe; 14. Drain pipe; 15. Gas outlet pipe; 16. Fixing plate; 17. Fixing pipe; 18. Fixing component; 19. Sliding rod; 20. Liquid baffle cap; 21. Spring; 22. Motor one; 23. Stirring component; 24. Support net; 25. Sponge block; 26. Fixing column; 27. Rotating rod; 28. Splined cylinder; 29. ​​Extrusion roller; 30. Elastic component; 31. Motor two; 32. Support block. Detailed Implementation

[0021] It should be noted that, unless otherwise specified, the embodiments and features described in this application can be combined with each other. The present invention will now be described in detail with reference to the accompanying drawings and embodiments.

[0022] It should be noted that, unless otherwise specified, all technical and scientific terms used in this application have the same meaning as commonly understood by one of ordinary skill in the art to which this application pertains.

[0023] In this utility model, unless otherwise stated, the orientations used, such as "up" and "down", usually refer to the direction shown in the accompanying drawings, or to the vertical, perpendicular, or gravitational direction; similarly, for ease of understanding and description, "left" and "right" usually refer to the left and right shown in the accompanying drawings; "inner" and "outer" refer to the inner and outer contours of each component itself, but the above directional terms are not used to limit this utility model.

[0024] Please see Figures 1-7 A waste gas treatment device for a gas nitriding furnace includes a support leg 1, a spray vessel 2 fixedly connected to the support leg 1, a combustion chamber 3 fixedly connected to one side of the support leg 1, a burner 4 fixedly connected inside the combustion chamber 3, an ignition burner 5 fixedly connected to the combustion chamber 3, a connecting pipe 6 connected to the waste gas outlet of the deep nitriding furnace, a three-way valve 7 connected to the connecting pipe 6, a connecting pipe 8 connected between the three-way valve 7 and the burner 4, a pressure stabilizing and maintaining valve 9 fixedly connected to the connecting pipe 8, a connecting pipe 10 connected to the three-way valve 7, a gas distribution plate 11 fixedly connected to the spray vessel 2, a water inlet pipe 13 and a spray plate 12 fixedly connected to the spray vessel 2, the water inlet pipe 13 and the spray plate 12 connected, and a drain pipe 14 and a gas outlet pipe 15 fixedly connected to both the upper and lower sides of the spray vessel 2.

[0025] Please see Figures 3-5 A fixing plate 16 is fixedly connected to the inner wall of the spray vessel 2. The fixing plate 16 is embedded with fixing pipes 17 that are evenly distributed around the circumference. A fixing member 18 is fixedly connected inside the fixing pipe 17. A sliding rod 19 is slidably connected to the fixing member 18. A liquid-blocking cap 20 is fixedly connected to the sliding rod 19. A gap is provided between the liquid-blocking cap 20 and the adjacent fixing pipe 17, and the lowest side of the liquid-blocking cap 20 is lower than the upper side of the fixing pipe 17. A spring 21 is fixedly connected between the sliding rod 19 and the fixing member 18. A motor 22 is fixedly connected to the bottom of the spray vessel 2. The output of the motor 22 passes through the fixing plate 16. A stirring member 23 is fixedly connected to the output end of the motor 22.

[0026] Please see Figure 3 , Figure 6 and Figure 7A support mesh 24 is fixed to the inner wall of the spraying vessel 2. Two sponge blocks 25 are set on the support mesh 24. A fixed column 26 is embedded in the middle of the support mesh 24. A rotating rod 27 is rotatably connected to the fixed column 26. The rotating rod 27 is provided with a spline. A spline cylinder 28 is splined to the rotating rod 27. Two extrusion rollers 29 are rotatably connected to the spline cylinder 28. An elastic element 30 is fixed between the fixed column 26 and the spline cylinder 28. A motor 31 is fixed to the top of the spraying vessel 2. The output shaft of the motor 31 is fixed to the rotating rod 27. Two support blocks 32 are fixed between the two sponge blocks 25.

[0027] The working principle of this utility model is as follows: When the concentration of ammonia in the exhaust gas is too low to be ignited, the working state of the three-way valve 7 is adjusted so that the exhaust gas in the connecting pipe 6 can enter the connecting pipe 10 through the three-way valve 7. Then, the treatment liquid is pumped into the water inlet pipe 13. The treatment liquid is sprayed out from the spray plate 12 in the form of atomization. The exhaust gas moves upward from the air distribution plate 11. After the exhaust gas comes into contact with the treatment liquid, the treatment liquid neutralizes the ammonia in the exhaust gas. The treated exhaust gas is discharged from the outlet pipe 15 for further treatment.

[0028] After a period of time, when the ammonia concentration in the exhaust gas reaches a level sufficient to be ignited, the pumping of treatment liquid into the inlet pipe 13 is stopped, and the three-way valve 7 is controlled to allow the exhaust gas to flow along the connecting pipe 2 8. The exhaust gas enters the burner 4 through the pressure stabilizing and pressure-maintaining valve 9, and then is ignited by the ignition burner 5. The exhaust gas is ignited at the burner 4, reducing the direct emission of exhaust gas into the atmosphere.

[0029] During the process of the exhaust gas passing through the spray tower, the treatment liquid forms a liquid film on the fixed plate 16. The exhaust gas passes through the liquid film, reducing its temperature. The upward-flowing exhaust gas passes through the gap between the fixed pipe and the liquid-blocking cap 20 and passes through the liquid surface on the fixed plate 16, thereby improving the treatment effect of the cleaning liquid on the exhaust gas. The increased exhaust gas pressure on the lower side of the fixed plate 16 causes the exhaust gas to push the liquid-blocking cap 20 upward, causing the sliding rod 19 to move upward. At the same time, the spring 21 is compressed, thus preventing excessive pressure on the lower side of the fixed plate 16 from affecting the exhaust gas treatment effect. The motor 22 is started, and the motor 22 drives the agitator 23 to rotate circumferentially. The agitator 23 slowly stirs the liquid film on the fixed plate 16, thereby keeping the treatment liquid on the fixed plate 16 in a flowing state. The treatment liquid flows downward through the gap between the fixed pipe 17 and the liquid-blocking cap 20 and is discharged from the drain pipe 14.

[0030] The treatment liquid sprayed downwards from the spray plate 12 is absorbed by the sponge block 25. After absorbing the treatment liquid, the sponge block 25 forms a porous liquid film. As the exhaust gas passes through the sponge block 25 containing the treatment liquid, the exhaust gas is dispersed in the sponge block 25 and neutralized by the treatment liquid, thereby improving the treatment effect of the exhaust gas.

[0031] After a period of time, motor 21 is started, which drives the rotating rod 27 to rotate. The rotating rod 27 drives the spline cylinder 28 to rotate through the spline. The spline cylinder 28 drives the two extrusion rollers 29 to rotate. After the pressure roller loses contact with the support block 32, under the tension of the elastic element 30, the spline cylinder 28 moves downward along the fixed column 26. The two extrusion rollers 29 move the sponge block 25 downward and roll along the sponge block 25, thereby squeezing the treatment liquid adsorbed in the sponge. After the sponge block 25 is squeezed, the treatment liquid in the sponge block 25 flows downward, allowing the sponge block 25 to absorb the new treatment liquid sprayed down. When the extrusion roller 29 contacts the support block 32 again, the extrusion roller 29 loses contact with the sponge block 25, and motor 21 is turned off.

[0032] Of all the solutions mentioned above, those involving the connection between two components can be selected according to the actual situation, such as welding, bolt and nut connection, bolt or screw connection, or other known connection methods, which will not be elaborated here. For all the fixed connections mentioned above, welding is preferred. Although embodiments of this utility model have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and variations can be made to these embodiments without departing from the principles and spirit of this utility model. The scope of this utility model is defined by the appended claims and their equivalents.

Claims

1. An exhaust gas treatment device for a gas nitriding furnace comprising a leg (1), characterised in that: The support leg (1) is fixedly connected to a spray vessel (2). A combustion chamber (3) is fixedly connected to one side of the support leg (1). A burner (4) is fixedly connected inside the combustion chamber (3). An ignition burner (5) is fixedly connected to the combustion chamber (3). A connecting pipe (6) is connected to the exhaust gas outlet of the deep nitrogen furnace. A three-way valve (7) is connected to the connecting pipe (6). A connecting pipe (8) is connected between the three-way valve (7) and the burner (4). The connecting pipe (8) is fixedly connected to... There is a pressure stabilizing valve (9), the three-way valve (7) is connected to the connecting pipe three (10), the spray tank (2) is fixedly connected to the air distribution plate (11), the connecting pipe three (10) is connected to the air distribution plate (11), the spray tank (2) is fixedly connected to the water inlet pipe (13) and the spray plate (12), the water inlet pipe (13) is connected to the spray plate (12), and the spray tank (2) is fixedly connected to the lower and upper sides of the drain pipe (14) and the air outlet pipe (15).

2. A waste gas treatment device for a gas nitriding furnace according to claim 1, characterized in that: The inner wall of the spraying vessel (2) is fixedly connected to a fixing plate (16), the fixing plate (16) is embedded with fixing tubes (17) distributed circumferentially at equal intervals, the fixing tubes (17) are fixedly connected to a fixing member (18), the fixing member (18) is slidably connected to a sliding rod (19), and the sliding rod (19) is fixedly connected to a liquid-blocking cap (20).

3. A waste gas treatment device for a gas nitriding furnace according to claim 2, characterized in that: A gap is provided between the liquid-blocking cap (20) and the adjacent fixed tube (17), and the lowermost side of the liquid-blocking cap (20) is lower than the upper side of the fixed tube (17).

4. A waste gas treatment device for a gas nitriding furnace according to claim 3, characterized in that: A spring (21) is fixed between the sliding rod (19) and the fixing member (18).

5. A waste gas treatment device for a gas nitriding furnace according to claim 4, characterized in that: The bottom of the spraying vessel (2) is fixedly connected to a motor (22), the output of the motor (22) passes through the fixed plate (16), and the output end of the motor (22) is fixedly connected to a stirring element (23).

6. A waste gas treatment device for a gas nitriding furnace according to claim 1, characterized in that: The inner wall of the spraying vessel (2) is fixed with a support net (24), and two sponge blocks (25) are provided on the support net (24). A fixing column (26) is embedded in the middle of the support net (24), and a rotating rod (27) is rotatably connected to the fixing column (26). The rotating rod (27) is provided with a spline.

7. A waste gas treatment device for a gas nitriding furnace according to claim 6, characterized in that: The rotating rod (27) is splinedly connected to a splined cylinder (28), and the splined cylinder (28) is rotatably connected to two extrusion rollers (29). An elastic element (30) is fixed between the fixed column (26) and the splined cylinder (28), which is part of the spraying kettle (2).

8. A waste gas treatment device for a gas nitriding furnace according to claim 7, characterized in that: The top of the spraying vessel (2) is fixedly connected to a motor (31), the output shaft of the motor (31) is fixedly connected to the rotating rod (27), and two support blocks (32) are fixedly connected between the two sponge blocks (25).

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