Condensation recovery device of nitriding furnace distillation retort

Abstract

The utility model relates to the technical field of condensation recovery, and discloses a condensation recovery device of a nitriding furnace distillation retort, which comprises a reaction furnace with an open bottom and fixed in the air, a sealing bottom cover arranged right below the reaction furnace, a lifting module arranged below the sealing bottom cover, and a uniform air supply structure arranged in the reaction furnace, ammonia gas, hydrogen and other gases are respectively fed into the reaction furnace through the uniform air supply structure; the condensation shunting structure comprises a condensation chamber, is arranged above the reaction furnace and is connected with the reaction furnace through an exhaust pipe, waste gas is converted into hydrogen and ammonia water through the condensation shunting structure, and the hydrogen is recycled; the decomposition and diversion structure comprises a decomposition chamber arranged on one side of the reaction furnace, the top of the decomposition chamber is connected with the condensation chamber through a flow guide pipe, ammonia water is decomposed into ammonia gas and water in the decomposition chamber, and the ammonia gas is recycled. Compared with the prior art, the device disclosed by the utility model has the advantages that the condensation shunting structure is arranged, so that waste gas can be condensed, ammonia water is prevented from flowing back, and hydrogen and ammonia gas are recycled.

Description

Technical Field

[0001] This utility model relates to the field of condensation recovery technology, specifically to a condensation recovery device for a nitriding furnace distillation still. Background Technology

[0002] Nitriding is a chemical heat treatment process in which nitrogen atoms diffuse into the surface layer of a workpiece at a specific temperature and in a specific medium. Common types include liquid nitriding, gas nitriding, and ion nitriding. Traditional gas nitriding involves placing the workpiece in a sealed container, passing flowing ammonia gas through it, and heating it. After holding it at this temperature for a relatively long time, the ammonia gas thermally decomposes to produce active nitrogen atoms, which are continuously adsorbed onto the workpiece surface and diffuse into the surface layer, thereby changing the chemical composition and structure of the surface layer and obtaining excellent surface properties.

[0003] However, existing gas nitriding furnaces require the introduction of hydrogen to maintain the flow of ammonia and control the gas pressure inside the furnace during nitriding, while also preventing oxidation reactions. As a result, the exhaust gas contains hydrogen and water vapor produced by hydrogen oxidation. During the emission process, the water vapor condenses, and the residual ammonia in the exhaust gas dissolves into the water, forming corrosive ammonia water. This water flows back along the exhaust pipe, causing pollution and damage to the inside of the nitriding furnace. In addition, the hydrogen and ammonia in the exhaust gas can be recycled to reduce resource waste. Utility Model Content

[0004] The technical problem to be solved by this utility model is to overcome the above-mentioned technical difficulties and provide a condensation and recovery device for a nitriding furnace distillation still, which separates hydrogen and ammonia water in the waste gas through condensation, prevents ammonia water backflow, recovers hydrogen, and recovers ammonia gas after ammonia water decomposes.

[0005] To solve the above-mentioned technical problems, the technical solution provided by this utility model is as follows:

[0006] A condensation recovery device for a nitriding furnace distillation still includes:

[0007] The reactor has an open bottom that is fixed in the air, with a sealed bottom cover directly below it. A lifting module is installed under the sealed bottom cover. The reactor is equipped with a uniform air supply structure, through which ammonia and hydrogen are fed into the reactor respectively.

[0008] The condensation and diversion structure includes a condensation chamber, which is located above the reactor and connected to the reactor through an exhaust pipe. The waste gas is converted into hydrogen and ammonia water through the condensation and diversion structure, and the hydrogen is recovered.

[0009] The decomposition and diversion structure includes a decomposition chamber located on one side of the reactor, and its top is connected to the condensation chamber via a guide pipe. Ammonia water is decomposed into ammonia gas and water in the decomposition chamber, and the ammonia gas is recovered.

[0010] As an improvement, the condensation diversion structure also includes a condenser tube; an annular condensation tank is provided in the condensation chamber, the top of the annular condensation tank is open, and an annular water tank is provided above it. The annular water tank is filled with cold water. The condenser tube is arranged in a spiral shape on the inner side wall of the annular water tank, and its upper end is connected to the exhaust pipe, and its lower end is connected to the bottom of the annular water tank. A hydrogen recovery pipe is provided at the top of the condensation chamber, and a fan and a filter are provided inside the hydrogen recovery pipe.

[0011] As an improvement, the decomposition and diversion structure also includes an ammonia recovery pipe installed at the top of the decomposition chamber and a sewage discharge pipe installed at the bottom of the decomposition chamber, with a fan installed in the ammonia recovery pipe and a valve installed in the sewage discharge pipe.

[0012] As an improvement, the uniform air supply structure includes an air supply pipe, a guide plate, a flow equalization sieve plate, and a flow guiding air supply plate. An annular air supply chamber is provided on the side wall of the reactor, and an air outlet is provided at the bottom of the inner side wall of the air supply chamber. Multiple air supply pipes are uniformly arranged circumferentially at the top of the reactor. Spiral guide plates are arranged corresponding to the air supply pipes and are spirally arranged within the air supply chamber. Multiple flow equalization sieve plates are horizontally arranged in the air supply chamber below the guide plates, and are arranged vertically. Multiple flow guiding air supply plates are uniformly arranged circumferentially in the air supply chamber below the flow equalization sieve plates and are spirally arranged, with their bottoms corresponding to the air outlets of the air supply chamber. Ammonia and hydrogen gases enter the air supply chamber through the air supply pipes, form a circulating flow through the guide plates, and are mixed through the flow equalization sieve plate before forming a circulating cyclone through the flow guiding air supply plates and entering the reactor.

[0013] The advantages of this utility model compared with the prior art are as follows:

[0014] 1. This utility model is equipped with a condensation and diversion structure, which can condense the waste gas, dissolve the residual ammonia in the waste gas into the condensate water, and store and transfer the ammonia water, preventing the ammonia water from flowing back and causing pollution and damage to the inside of the nitriding furnace, making it safer to use.

[0015] 2. This utility model is equipped with a condensation diversion structure and a decomposition diversion structure, which can separate waste gas into ammonia water and hydrogen gas, and recover the hydrogen gas, decompose the ammonia water, and recover the ammonia gas, thus making resource utilization more efficient and more environmentally friendly. Attached Figure Description

[0016] Figure 1 This is a schematic diagram of the structure of this utility model.

[0017] Figure 2 This is a partial structural schematic diagram of the present invention.

[0018] Figure 3 This is a cross-sectional schematic diagram of the present invention.

[0019] Figure 4This is a schematic diagram of the uniform air delivery structure of this utility model.

[0020] Figure 5 This is a cross-sectional schematic diagram of the condensation and diversion structure of this utility model.

[0021] As shown in the figure: 1. Reactor; 2. Sealed bottom cover; 3. Bracket; 4. Condensation chamber; 5. Decomposition chamber; 6. Air supply chamber; 7. Gas supply pipe; 8. Baffle plate; 9. Flow equalization sieve plate; 10. Flow guide air supply plate; 11. Annular water tank; 12. Annular condensation tank; 13. Hydrogen recovery pipe; 14. Exhaust pipe; 15. Condensation pipe; 16. Filter; 17. Baffle pipe; 18. Ammonia recovery pipe; 19. Sewage pipe; 20. Chemical dosing pipe; 21. Lifting module; 22. Lifting well. Detailed Implementation

[0022] In the description of this utility model, it should be understood that the terms "center," "lateral," "upper," "lower," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," and "outer," etc., indicating orientation or positional relationships based on the orientation or positional relationships shown in the accompanying drawings, are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this utility model. Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this utility model, unless otherwise stated, "a plurality of" means two or more. Additionally, the term "comprising" and any variations thereof are intended to cover non-exclusive inclusion.

[0023] The present invention will now be described in further detail with reference to the accompanying drawings.

[0024] A condensation recovery device for a nitriding furnace distillation still, such as Figure 1 , Figure 2 As shown, the reactor includes a reactor 1, which is open at the bottom and fixed in the air. A lifting shaft 22 is located directly below it, and a lifting module 21 (i.e., a hydraulic telescopic rod) is installed inside the lifting shaft 22. A sealing bottom cover 2 is installed on the top of the lifting module 21 (i.e., the hydraulic telescopic rod) corresponding to the reactor 1. The sealing bottom cover 2 rises via the lifting module 21 and closes to the bottom of the reactor 1, sealing the reactor 1. A condensation diversion structure is installed on the top of the reactor 1 and is connected to the condensation diversion structure via an exhaust pipe 14. A decomposition diversion structure is installed on one side of the reactor 1, and the condensation diversion structure is connected to the decomposition diversion structure via a guide pipe 17. Specifically:

[0025] Reactor 1, such as Figure 3 , Figure 4 As shown, reactor 1 is an air nitriding furnace, with a ring-shaped air supply chamber 6 arranged circumferentially on its inner side wall. An air outlet is located at the bottom of the inner side wall of the air supply chamber 6. The air supply chamber 6 is equipped with a uniform air supply structure, such as... Figure 3 , Figure 4 As shown, the uniform air supply structure includes an air supply pipe 7, a guide plate 8, a flow equalization screen plate 9, and a flow guiding air supply plate 10. Four air supply pipes 7 are uniformly arranged circumferentially on the top of the reactor 1, and are respectively connected to storage tanks for ammonia, nitrogen, hydrogen, and clean air (filtered air). Each air supply pipe 7 is equipped with a valve, a pressure sensor, and a flow meter. The guide plate 8, the flow equalization screen plate 9, and the flow guiding air supply plate 10 are arranged in the air supply chamber 6, and are arranged sequentially from top to bottom. There are four guide plates 8 corresponding to the air supply pipes 7, and they are arranged in a spiral shape. There are three layers of flow equalization screen plates 9 arranged horizontally from top to bottom. There are eight flow guiding air supply plates 10 uniformly arranged circumferentially in the air supply chamber 6, and they are arranged in a spiral shape. Their bottoms are arranged facing inwards to the air outlet of the air supply chamber 6, and their tops are arranged upwards. A heating module is provided on the inner wall of the air supply chamber 6 of the reactor 1, and an exhaust pipe 14 is provided on the top.

[0026] As described above, the gas enters the air supply chamber 6 through the gas supply pipe 7, forms a circulation within the air supply chamber 6 through the guide plate 8, and is decelerated and mixed between the flow equalization sieve plates 9. After being mixed evenly, it passes through the guide air supply plate 10 under the action of the air pressure difference, and after leaving the guide air supply plate 10, it forms an airflow in the tangential direction along the inner wall of the air supply chamber 6. Under the action of the evenly distributed circumference, a stable circulation is formed. At the same time, the gas pressure inside the reactor 1 is maintained by exhaust, ensuring the stability of gas flow and gas pressure inside the reactor 1, so that the nitriding effect is more uniform and effective.

[0027] Condensation split structure, such as Figure 3 , Figure 5As shown, the reactor includes a condenser chamber 4, a hydrogen recovery pipe 13, and a condenser pipe 15. The condenser chamber 4 is fixed above the reactor 1, and an annular condenser trough 12 and an annular water tank 11 are provided inside the condenser chamber 4. The annular condenser trough 12 is located at the bottom of the condenser chamber 4, and a dilution water pipe is provided on its side wall. A guide pipe 17 is provided at the bottom, and a valve is provided on the guide pipe 17. The annular water tank 11 is fitted and fixed inside the condenser chamber 4 above the annular condenser trough 12. It contains cold water and is equipped with a water supply pipe and a water drain pipe. The condenser pipe 15 is arranged in a spiral shape in the annular condenser chamber 4. The exhaust pipe 14 is installed on the inner wall of the annular water tank 11, and after being immersed in water, the lower end is facing down and passes through the bottom wall of the annular water tank 11. One end of the exhaust pipe 14 passes through the bottom wall of the condensing chamber 4 and is connected to the upper end of the condensing pipe 15. The exhaust pipe 14 is arranged in the center of the annular condensing tank 12. After the exhaust gas in the condensing pipe 15 is condensed, the condensate flows into the annular condensing tank 12. The hydrogen recovery pipe 13 is set at the top of the condensing chamber 4, and a fan and a filter 16 (the filter 16 is an activated carbon filter, which adsorbs and filters some harmful gases) are installed in the hydrogen recovery pipe 13.

[0028] Decompose the flow distribution structure, such as Figure 3 , Figure 5 As shown, it includes a decomposition chamber 5, an ammonia recovery pipe 18, and a drain pipe 19. The decomposition chamber 5 is fixed to one side of the reactor 1 and located below the condensation chamber 4. One side of its top is connected to the guide pipe 17, and the other side is provided with a dosing pipe 20. The ammonia recovery pipe 18 is located at the top of the decomposition chamber 5 and is equipped with a fan. The drain pipe 19 is located at the bottom of the decomposition chamber 5 and is equipped with a valve. The inner wall of the decomposition chamber 5 is equipped with a heating module.

[0029] Various sensors are installed in reactor 1, condensation chamber 4, and decomposition chamber 5 to detect temperature, gas pressure, gas content, etc.

[0030] In the specific implementation of this embodiment:

[0031] Metal parts are placed on the bracket 3. The lifting module 21 is extended to raise the sealing bottom cover 2 and close it to the bottom of the reactor 1, sealing the metal parts inside the reactor 1. The heating module of the reactor 1 is started, and the processing gas is supplied through the gas supply pipe 7. Ammonia is used for nitriding, hydrogen is used to maintain the gas pressure inside the furnace, keep the flow, and prevent oxidation, and clean air is used for cooling. The exhaust gas after nitriding mainly consists of hydrogen, water vapor, and ammonia. All gases enter the air supply chamber 6 through the gas supply pipe 7. The airflow is formed in the air supply chamber 6 by the guide plate 8, and is decelerated and mixed between the flow equalization sieve plates 9. After being mixed evenly, it passes through the guide air supply plate 10 under the action of air pressure difference. After leaving the guide air supply plate 10, it forms an airflow in the tangential direction along the inner wall of the air supply chamber 6. Under the action of uniform circumferential arrangement, a stable circulation is formed. At the same time, the gas pressure in the reactor 1 is maintained by exhaust, ensuring the stability of gas flow and gas pressure in the reactor 1, and nitriding the surface of the metal parts on the bracket 3 to improve the performance of the metal parts.

[0032] Turn on the fan inside the hydrogen recovery pipe 13 to create negative pressure inside the hydrogen recovery pipe 13 and form a pressure difference with the reactor 1. The waste gas in the reactor 1 enters the condenser pipe 15 through the exhaust pipe 14. After being cooled by the cold water in the annular water tank 11, the water vapor in the waste gas condenses into condensate and flows into the annular condensation tank 12 along the condenser pipe 15. During the process, the ammonia in the waste gas dissolves in the condensate to form ammonia water. The remaining waste gas is mainly hydrogen. After leaving the condenser pipe 15, it passes through the filter 16 to adsorb and filter harmful substances before being recovered through the hydrogen recovery pipe 13 (nitrogen and hydrogen can be separated and screened by membrane separation).

[0033] Open the guide pipe 17 to allow ammonia water in the annular condensation tank 12 to flow into the decomposition chamber 5. Add sodium hydroxide solvent (catalyst) into the decomposition chamber 5 through the dosing pipe 20. After contacting the ammonia water, it releases heat and promotes the decomposition of ammonia water. Alternatively, open the heating module of the decomposition chamber 5 to heat the ammonia water, causing it to decompose into ammonia gas and water. Open the ammonia gas recovery pipe 18 to recover the ammonia gas. If there is a lot of wastewater in the decomposition chamber 5, open the drain pipe 19 to discharge the wastewater to the wastewater treatment pond for treatment. If the ammonia water concentration in the annular condensation tank 12 is high, add water through the dilution water pipe to dilute it and prevent crystallization in the annular condensation tank 12.

[0034] The present invention and its embodiments have been described above. This description is not restrictive, and the accompanying drawings are only one embodiment of the present invention; the actual structure is not limited thereto. In conclusion, if those skilled in the art are inspired by this description and design similar structures and embodiments without departing from the inventive spirit of the present invention, such designs should fall within the protection scope of the present invention.

Claims

1. A condensation and recovery device for a nitriding furnace distillation still, characterized in that, include: The reactor (1) is open at the bottom and fixed in the air. A sealed bottom cover (2) is set directly below it. A lifting module (21) is set under the sealed bottom cover (2). A uniform air supply structure is set inside the reactor (1). Ammonia and hydrogen are respectively sent into the reactor (1) through the uniform air supply structure. The condensation and diversion structure includes a condensation chamber (4), which is located above the reactor (1) and connected to the reactor (1) through an exhaust pipe (14). The waste gas is converted into hydrogen and ammonia water through the condensation and diversion structure, and the hydrogen is recovered. The decomposition and diversion structure includes a decomposition chamber (5), which is located on one side of the reactor (1) and connected to the condensation chamber (4) at the top through a guide pipe (17). Ammonia water is decomposed into ammonia gas and water in the decomposition chamber (5), and the ammonia gas is recovered.

2. The condensation and recovery device for a nitriding furnace distillation still according to claim 1, characterized in that: The condensation diversion structure also includes a condenser tube (15); an annular condensation tank (12) is provided in the condensation chamber (4), the top of the annular condensation tank (12) is open, and an annular water tank (11) is provided above it. Cold water is provided in the annular water tank (11), and the condenser tube (15) is arranged in a spiral shape on the inner side wall of the annular water tank (11), with the upper end connected to the exhaust pipe (14) and the lower end connected to the bottom of the annular water tank (11).

3. The condensation and recovery device for a nitriding furnace distillation still according to claim 2, characterized in that: The condensation diversion structure also includes a hydrogen recovery pipe (13) installed at the top of the condensation chamber (4), and a fan and a filter (16) are installed inside the hydrogen recovery pipe (13).

4. The condensation and recovery device for a nitriding furnace distillation still according to claim 1, characterized in that: The decomposition and diversion structure also includes an ammonia recovery pipe (18) set at the top of the decomposition chamber (5) and a sewage pipe (19) set at the bottom of the decomposition chamber (5), and a fan is installed in the ammonia recovery pipe (18) and a valve is installed in the sewage pipe (19).

5. The condensation and recovery device for a nitriding furnace distillation still according to claim 1, characterized in that: The uniform air supply structure includes an air supply pipe (7), a guide plate (8), a flow equalization sieve plate (9), and a flow guide air supply plate (10). The side wall of the reactor (1) is provided with an annular air supply chamber (6), and an air outlet is provided at the bottom of the inner side wall of the air supply chamber (6). Multiple air supply pipes (7) are uniformly arranged around the top of the reactor (1). Spiral guide plates (8) are arranged corresponding to the air supply pipes (7) and are arranged in a spiral shape in the air supply chamber (6). Flow equalization sieve plates (9) are arranged horizontally in the air supply chamber (6) below the guide plate (8) and are arranged in multiple ways along the top and bottom. Multiple flow guide air supply plates (10) are uniformly arranged around the air supply chamber (6) below the flow equalization sieve plate (9) and are arranged in a spiral shape. At the same time, the bottom is provided corresponding to the air outlet of the air supply chamber (6).

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