A tempering furnace for heat treatment process

Abstract

The present invention belongs to the technical field of tempering furnaces, and specifically relates to a tempering furnace for a heat treatment process, comprising a tempering furnace main body, a tempering chamber is provided in the tempering furnace main body, a base is provided in the tempering chamber, the tempering furnace main body comprises: a smoke exhaust pipe, one end of the smoke exhaust pipe penetrates the tempering furnace main body and is connected to the tempering chamber, and is used to discharge the smoke in the tempering chamber; the tempering furnace main body also comprises: a reaction unit, the reaction unit is connected to the other end of the smoke exhaust pipe, and receives the smoke discharged by the smoke exhaust pipe; a pressurizing unit, the pressurizing unit is located below the reaction unit, is connected to the reaction unit, and is connected to the tempering chamber to pressurize the tempering furnace; the problem that a workpiece shrinks due to the elimination of tensile stress and expands due to the elimination of compressive stress caused by tempering is solved, and most tempering furnaces do not have pressurizing equipment, which will cause the pressure in the furnace to fail to meet the requirements during the tempering process, resulting in tempering deformation of the workpiece.

Description

Technical Field

[0001] The invention belongs to the technical field of tempering furnaces, and in particular relates to a tempering furnace for a heat treatment process. Background Art

[0002] With the development of science and technology and the continuous improvement of production equipment, people have higher and higher requirements for heat treatment processes, and thus higher and higher requirements for heat treatment equipment. Tempering, as a heat treatment process, needs to be tempered in a tempering furnace. The tempering furnace is used for tempering of general metal parts in the air and quenching, annealing and aging heat treatment of light alloy parts such as aluminum alloy die castings, pistons, and aluminum plates. It can be divided into high temperature tempering, medium temperature tempering and low temperature tempering;

[0003] At present, during the medium-temperature tempering process, the workpiece shrinks due to the elimination of tensile stress and expands due to the elimination of compressive stress. In the early stage of tempering, carbides will precipitate from the workpiece, which will cause some shrinkage, and the austenite will shrink a lot during the condensation process. The residual austenite will expand when it transforms into loose iron, and the residual austenite will expand when it transforms into tough iron. Most tempering furnaces do not have pressurizing equipment, which will cause the pressure in the furnace to fail to meet the requirements during the tempering process, resulting in tempering deformation of the workpiece.

[0004] In view of this, a tempering furnace for heat treatment process is proposed to solve the above problems. Summary of the invention

[0005] The technical problem to be solved by the present invention is: during the medium-temperature tempering process, the workpiece shrinks due to the elimination of tensile stress and expands due to the elimination of compressive stress caused by tempering, including the precipitation of e carbides in the workpiece in the initial stage of tempering, which will cause some shrinkage, a large amount of shrinkage during the condensation process of snow-carbon iron, expansion of residual austenite transformed into loose iron, and expansion of residual austenite transformed into ductile iron, etc. However, most tempering furnaces do not have pressurizing equipment, which will cause the pressure in the furnace to fail to meet the requirements during the tempering process, resulting in the problem of tempering deformation of the workpiece.

[0006] To achieve the above object, the present invention provides the following technical solutions:

[0007] The present invention provides a tempering furnace for heat treatment process, comprising a tempering furnace body, a tempering chamber is provided in the tempering furnace body, a base is provided in the tempering chamber, the tempering furnace body comprises: a smoke exhaust pipe, one end of the smoke exhaust pipe passes through the tempering furnace body and is connected to the tempering chamber, and is used to discharge the smoke in the tempering chamber;

[0008] It is characterized in that the tempering furnace body also includes:

[0009] A reaction unit, the reaction unit is connected to the other end of the smoke exhaust pipe and receives the smoke exhausted from the smoke exhaust pipe;

[0010] The pressurizing unit is located below the reaction unit, is connected and matched with the reaction unit, and is connected with the tempering chamber to pressurize the tempering furnace.

[0011] Preferably, the reaction unit comprises:

[0012] A reaction chamber, the reaction chamber is connected to one end of the smoke exhaust pipe and is fixedly and sealedly connected at the connection point;

[0013] A feed pipe, one end of which is connected to the reaction chamber and is fixedly sealed at the connection point to provide reaction material into the reaction chamber;

[0014] An exhaust pipe, one end of which is connected to the reaction chamber and is fixedly sealed at the connection point, and exhausts the gas to the outside after the reaction in the reaction chamber is completed.

[0015] An electrically controlled valve is electrically connected to a concentration sensor. The smoke exhaust pipe, the feed pipe, the exhaust pipe and the reaction chamber are connected with an electrically controlled valve and a concentration sensor.

[0016] Preferably, the pressurizing unit comprises:

[0017] A pressure pipe, one end of which is connected to the reaction chamber, and the other end of which passes through the tempering furnace body and is connected to the tempering chamber. The two ends are fixedly sealed and connected at the connecting points. A one-way valve is provided at the connecting port between the pressure pipe and the tempering chamber;

[0018] A fixing rod, the fixing rod being fixedly connected to the inner wall of one end of the pressurized tube close to the tube opening;

[0019] A tension spring, the upper end of which is fixedly connected to the fixing rod;

[0020] A piston, wherein the upper end surface of the piston is fixedly connected to the lower end of the tension spring, and the piston is slidably and sealingly connected to the inner wall of the pressurized tube;

[0021] The air intake pipe is located below the piston, is connected to the pressure pipe, and is fixedly sealed at the connection point. A one-way valve is provided at the connection port between the air intake pipe and the pressure pipe.

[0022] Preferably, the fixing rod and the tension spring are made of high temperature resistant materials.

[0023] Preferably, the high temperature resistant elastic material may be heat resistant steel.

[0024] Preferably, the tempering chamber further includes an impeller, the impeller is rotatably connected to the base, and the top position of the impeller corresponds to the connecting port between the pressurizing pipe and the tempering chamber.

[0025] Preferably, a sliding seat is rotatably connected to the upper surface of the base, and the sliding seat is fixedly connected to the impeller shaft.

[0026] Preferably, the upper surface of the sliding seat is provided with grooves, and the grooves are evenly distributed around the impeller shaft.

[0027] Preferably, the highest point of the sliding seat is lower than the lowest point of the impeller.

[0028] Preferably, the tempering furnace body is coated with a heat-insulating layer.

[0029] Compared with the prior art, the present invention has the following beneficial effects:

[0030] 1. The present invention provides a tempering furnace for heat treatment process, which is provided with a reaction unit. After the flue gas enters the reaction unit, a large amount of heat is generated by the reaction to drive the pressurizing unit to move, thereby pressurizing the tempering chamber through the pressurizing unit;

[0031] 2. At the same time, since the temperature required for the reaction in the reaction unit is within the medium-temperature tempering range, and the temperature of the flue gas discharged by tempering is almost the same as the tempering temperature, there is no need to add an additional heat source when the reaction occurs in the reaction unit, and the heat generated by the tempering furnace is reused to reduce energy consumption; and the flue gas generated by tempering reacts in the reaction chamber in the reaction unit, so that harmful substances in the flue gas, such as nitrogen oxides, are converted into harmless gases, and then discharged through the exhaust pipe, reducing the harm caused by the flue gas. BRIEF DESCRIPTION OF THE DRAWINGS

[0032] Figure 1 It is a schematic diagram of the overall structure of the present invention;

[0033] Figure 2 For the present invention Figure 1 center right view;

[0034] Figure 3 It is a schematic diagram of the cross-sectional structure of the present invention;

[0035] Figure 4 For the present invention Figure 1 Center left view partial schematic diagram;

[0036] Figure 5 For the present invention Figure 3 Schematic diagram of the structure of the middle base viewed from above.

[0037] In the figure: base 1, smoke exhaust pipe 2, reaction unit 3, reaction chamber 31, feed pipe 32, exhaust pipe 33, electric control valve 34, pressurizing unit 4, pressurizing pipe 41, fixing rod 42, tension spring 43, piston 44, air inlet pipe 45, impeller 5, sliding seat 6, groove 7. DETAILED DESCRIPTION

[0038] The technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all the embodiments; based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of the present invention.

[0039] The defect of the tempering furnace used in the heat treatment process in the prior art is that during the medium-temperature tempering process, the furnace shrinks due to the elimination of tensile stress and expands due to the elimination of compressive stress, including some shrinkage of e carbides precipitated in the early stage of tempering, a large amount of shrinkage during the condensation process of snow-carbon iron, expansion of residual austenite transformed into loose iron, and expansion of residual austenite transformed into ductile iron, etc., which leads to the problem of tempering deformation.

[0040] In order to solve the above problems, the main concept adopted in this embodiment is: the high-temperature flue gas generated by tempering enters the reaction unit through the exhaust pipe, and reacts in the reaction unit to generate a large amount of heat, causing the gas to expand, thereby pushing the pressurizing unit to move, so that the pressurizing unit pressurizes the tempering chamber, avoiding the phenomenon that the tensile stress of the workpiece is eliminated and the workpiece shrinks, and the compressive stress is eliminated and the workpiece expands during the tempering process, thereby preventing tempering deformation.

[0041] In order to better understand the above technical solution, Figure 1-5 And specific implementation methods are used to describe the above technical solutions in detail:

[0042] The present invention provides a tempering furnace for heat treatment process, including a tempering furnace body, a tempering chamber is opened in the tempering furnace body, a base 1 is arranged in the tempering chamber, the tempering furnace body includes: a smoke exhaust pipe 2, one end of the smoke exhaust pipe 2 passes through the tempering furnace body and is connected to the tempering chamber, and is used to discharge the smoke in the tempering chamber.

[0043] It is characterized in that the tempering furnace body also includes:

[0044] A reaction unit 3, wherein the reaction unit 3 is connected to the other end of the smoke exhaust pipe 2 and receives the smoke exhausted from the smoke exhaust pipe 2;

[0045] The pressurizing unit 4 is located below the reaction unit 3, cooperates with the reaction unit 3, and is connected with the tempering chamber to pressurize the tempering furnace.

[0046] After the workpiece is quenched by quenching oil, it needs to be tempered in the tempering furnace. During the tempering process, a large amount of smoke will continue to be generated. The generated smoke enters the reaction unit 3 through the smoke exhaust pipe 2. A catalytic reduction reaction occurs in the reaction unit 3. A large amount of heat will be generated during the reaction process, causing the air pressure to rise, thereby pushing the pressurizing unit 4 to move. The pressurizing unit 4 presses air into the tempering chamber, causing the air pressure in the tempering chamber to increase, thereby avoiding the phenomenon that the tensile stress of the workpiece is eliminated and the workpiece expands due to the elimination of the compressive stress during the tempering process, and preventing the workpiece from being deformed by tempering due to the reduction of pressure;

[0047] Compared with the prior art, the temperature required for the reaction in the reaction unit 3 of the present invention is within the medium-temperature tempering range, and the temperature of the flue gas discharged by the tempering is almost the same as the tempering temperature. Therefore, there is no need to add an additional heat source when the reaction occurs in the reaction unit 3, and the heat generated by the tempering furnace is reused, which reduces energy consumption and has a simple structure.

[0048] As an embodiment of the present invention, the reaction unit 3 comprises:

[0049] A reaction chamber 31, wherein the reaction chamber 31 is connected to one end of the smoke exhaust pipe 2 and is fixedly and sealedly connected at the connection point;

[0050] A feed pipe 32, one end of which is connected to the reaction chamber 31 and is fixedly sealed at the connection point to provide reaction materials into the reaction chamber 31;

[0051] The exhaust pipe 33 has one end connected to the reaction chamber 31 and is fixedly sealed at the connection point, and exhausts the gas to the outside after the reaction in the reaction chamber 31 is completed.

[0052] An electrically controlled valve 34, wherein the electrically controlled valve 34 is electrically connected to a concentration sensor, and the electrically controlled valve 34 and the concentration sensor are disposed at the connection ports of the exhaust pipe 2, the feed pipe 32, the exhaust pipe 33 and the reaction chamber 31;

[0053] The pressurizing unit 4 comprises:

[0054] A pressure pipe 41, one end of which is connected to the reaction chamber 31, and the other end of which passes through the tempering furnace body and is connected to the tempering chamber. The two ends are fixedly sealed and connected at the connecting points. A one-way valve is provided at the connecting port of the pressure pipe 41 and the tempering chamber;

[0055] A fixing rod 42, wherein the fixing rod 42 is fixedly connected to the inner wall of one end of the pressurizing tube 41 close to the tube opening;

[0056] A tension spring 43, the upper end of which is fixedly connected to the fixing rod 42;

[0057] A piston 44, wherein the upper end surface of the piston 44 is fixedly connected to the lower end of the tension spring 43, and the piston 44 is slidably and sealingly connected to the inner wall of the pressure tube 41;

[0058] The air intake pipe 45 is located below the piston 44 and is connected to the pressurizing pipe 41 . The air intake pipe 45 is fixedly sealed at the connection point. A one-way valve is provided at the connection point between the air intake pipe 45 and the pressurizing pipe 41 .

[0059] When the flue gas enters the reaction chamber 31, the electric control valve 34 at the exhaust pipe 33 is in a closed state, and the ammonia-oxygen mixture at room temperature is injected into the reaction chamber 31 through the feed pipe 32. When the flue gas concentration and the ammonia concentration in the reaction chamber 31 are higher than the preset values ​​of the concentration sensors at the exhaust pipe 2 and the feed pipe 32, the electric control valves 34 in the two pipes are closed, and the flue gas and the ammonia-oxygen mixture are stopped from being introduced into the reaction chamber 31. According to the chemical equation of the catalytic reduction reaction:

[0060] 4NO+4NH3+O2→4N2+6H2O;

[0061] 6NO+4NH3→5N2+6H2O;

[0062] 6NO2+8NH3→7N2+12H2O;

[0063] 2NO2+4NH3+O2→3N2+6H2O;

[0064] It can be seen that the nitrogen oxides in the flue gas react with the ammonia-oxygen mixture and generate a lot of heat, causing the gas to expand and the gas pressure to increase;

[0065] When the nitrogen oxides in the flue gas in the reaction chamber 31 undergo a catalytic reduction reaction to generate a large amount of heat, the air pressure increases. Since the pressurizing pipe 41 is connected to the reaction chamber 31, the piston 44 in the pressurizing pipe 41 moves downward under the pressure, so that the gas below the piston 44 in the pressurizing pipe 41 enters the tempering chamber through the one-way valve under the air pressure, so that the pressure in the tempering chamber increases, thereby pressurizing the tempering chamber and solving the problem of tempering deformation.

[0066] As the reaction proceeds, nitrogen oxides in the flue gas are consumed. When the nitrogen oxide concentration is lower than the preset value of the concentration sensor at the outlet of the exhaust pipe 33, the electric control valve 34 at the outlet of the exhaust pipe 33 opens, and the flue gas after the reaction is discharged. When the exhaust pipe 33 exhausts to the outside, the piston 44 in the pressurizing pipe 41 is no longer under pressure. Since the upper end of the tension spring 43 is fixedly connected to the fixing rod 42, the piston 44 moves upward under the elastic force of the tension spring 43. Moreover, since the piston 44 is slidably and sealedly connected to the inner wall of the pressurizing pipe 41, when the piston 44 moves upward, external air can enter the pressurizing pipe 41 through the one-way valve in the air inlet pipe 45, thereby preventing negative pressure from being generated in the pressurizing pipe below the piston.

[0067] When the smoke concentration in the reaction chamber is lower than the preset values ​​of the concentration sensors at the smoke exhaust pipe port 2 and the feed pipe port 32, the smoke exhaust pipe port 2 is opened, and smoke is re-injected into the reaction chamber 31. At this time, the air pressure in the reaction chamber 31 is greater than the air pressure in the reaction chamber 31 last time, and the electric control valve at the smoke exhaust pipe port 2 is closed. As the electric control valve 34 at the feed pipe port 32 is opened, an ammonia-oxygen mixture is added to pressurize. After the reaction is pressurized again, the pressure of the gas added to the tempering chamber is greater than the pressure of the gas added last time, so that the pressure in the tempering chamber rises again, and the above process is repeated;

[0068] Compared with igniting flue gas to allow it to fully burn and generate heat, thereby pressurizing the tempering chamber, the present invention generates heat through a catalytic reduction reaction between nitrogen oxides in the flue gas and ammonia, thereby avoiding the potential explosion risk caused by directly igniting the flue gas and being safer. At the same time, as the nitrogen oxides in the flue gas undergo a catalytic reduction reaction with ammonia, the nitrogen oxides are reduced to non-toxic gases and discharged, thereby reducing the pollution problem after the flue gas is discharged.

[0069] As an embodiment of the present invention, the fixing rod 42 and the tension spring 43 are made of high temperature resistant materials, such as heat resistant steel.

[0070] Since the reaction in the reaction chamber 31 generates a lot of heat, in order to ensure that the tension spring 43 and the fixing rod 42 have a high strength in a high temperature environment, the fixing rod 42 and the tension spring 43 are made of high temperature resistant materials, such as heat-resistant steel.

[0071] As an embodiment of the present invention, the tempering chamber further includes an impeller 5, the impeller 5 is rotatably connected to the base 1, and the top position of the impeller 5 corresponds to the communication port between the pressurizing pipe 41 and the tempering chamber.

[0072] By arranging the impeller 5, and the top position of the impeller 5 corresponds to the connecting port between the pressure pipe 41 and the tempering chamber, when the pressure pipe 41 pressurizes the gas into the tempering chamber, the impeller 5 is driven to rotate, so that the gas in the tempering chamber can circulate better, thereby enhancing the tempering performance and better blowing the smoke into the exhaust pipe 2.

[0073] As an embodiment of the present invention, a sliding seat 6 is rotatably connected to the upper surface of the base 1 , and the sliding seat 6 is fixedly connected to the rotating shaft of the impeller 5 .

[0074] Since the sliding seat 6 is fixedly connected to the rotating shaft of the impeller 5, when the impeller 5 rotates, the sliding seat 6 is also driven to rotate, so the workpiece placed on the sliding seat 6 can be better exposed to heat, thereby enhancing the tempering effect.

[0075] As an implementation mode of the present invention, the upper surface of the sliding seat 6 is provided with grooves 7 , and the grooves 7 are evenly distributed around the rotating shaft of the impeller 5 .

[0076] By opening grooves 7 on the upper surface of the sliding seat 6 and the grooves 7 being evenly distributed around the rotating shaft of the impeller 5 , a workpiece can be placed in the grooves 7 to prevent the workpiece from falling off when the sliding seat 6 rotates.

[0077] As an implementation mode of the present invention, the highest point of the sliding seat 6 is lower than the lowest point of the impeller 5 .

[0078] In order to prevent the sliding seat 6 from being too high and affecting the rotation of the impeller 5 , which may also affect the tempering effect of the workpiece, the highest point of the sliding seat 6 is set to be lower than the lowest point of the impeller 5 .

[0079] As an embodiment of the present invention, the tempering furnace body is outer-coated with a heat-insulating layer 8 .

[0080] When the tempering furnace body is covered with a heat-insulating layer 8, the tempering furnace body can be better insulated to prevent heat dissipation, thereby further enhancing the tempering effect.

[0081] Working principle: When the flue gas enters the reaction chamber 31, the electric control valve 34 at the exhaust pipe 33 is in a closed state, and the ammonia-oxygen mixture at room temperature is injected into the reaction chamber 31 through the feed pipe 32. When the flue gas concentration and ammonia concentration in the reaction chamber 31 are higher than the preset values ​​of the concentration sensors at the exhaust pipe 2 and the feed pipe 32, the electric control valves 34 in the two pipes are closed, and the flue gas and ammonia-oxygen mixture are stopped from being introduced into the reaction chamber 31. The chemical equation of the catalytic reduction reaction is:

[0082] 4NO+4NH3+O2→4N2+6H2O;

[0083] 6NO+4NH3→5N2+6H2O;

[0084] 6NO2+8NH3→7N2+12H2O;

[0085] 2NO2+4NH3+O2→3N2+6H2O;

[0086] It can be seen that the nitrogen oxides in the flue gas react with the ammonia-oxygen mixture and generate a lot of heat, causing the gas to expand and the gas pressure to increase;

[0087] When the nitrogen oxides in the flue gas in the reaction chamber 31 undergo a catalytic reduction reaction to generate a large amount of heat, the air pressure increases. Since the pressurizing pipe 41 is connected to the reaction chamber 31, the piston 44 in the pressurizing pipe 41 moves downward under the pressure, so that the gas below the piston 44 in the pressurizing pipe 41 enters the tempering chamber through the one-way valve under the air pressure, so that the pressure in the tempering chamber increases, thereby pressurizing the tempering chamber and solving the problem of tempering deformation.

[0088] As the reaction proceeds, nitrogen oxides in the flue gas are consumed. When the nitrogen oxide concentration is lower than the preset value of the concentration sensor at the outlet of the exhaust pipe 33, the electric control valve 34 at the outlet of the exhaust pipe 33 opens, and the flue gas after the reaction is discharged. When the exhaust pipe 33 exhausts to the outside, the piston 44 in the pressurizing pipe 41 is no longer under pressure. Since the upper end of the tension spring 43 is fixedly connected to the fixing rod 42, the piston 44 moves upward under the elastic force of the tension spring 43. Moreover, since the piston 44 is slidably and sealedly connected to the inner wall of the pressurizing pipe 41, when the piston 44 moves upward, external air can enter the pressurizing pipe 41 through the one-way valve in the air inlet pipe 45, thereby preventing negative pressure from being generated in the pressurizing pipe below the piston.

[0089] When the smoke concentration in the reaction chamber is lower than the preset values ​​of the concentration sensors at the smoke exhaust pipe port 2 and the feed pipe port 32, the smoke exhaust pipe port 2 is opened, and smoke is re-injected into the reaction chamber 31. At this time, the air pressure in the reaction chamber 31 is greater than the air pressure in the reaction chamber 31 last time, and the electric control valve at the smoke exhaust pipe port 2 is closed. As the electric control valve 34 at the feed pipe port 32 is opened, an ammonia-oxygen mixture is added to pressurize. After the reaction is pressurized again, the pressure of the gas added to the tempering chamber is greater than the pressure of the gas added last time, so that the pressure in the tempering chamber rises again, and the above process is repeated;

[0090] Compared with igniting flue gas to allow it to fully burn and generate heat, thereby pressurizing the tempering chamber, the present invention generates heat through a catalytic reduction reaction between nitrogen oxides in the flue gas and ammonia, thereby avoiding the potential explosion risk caused by directly igniting the flue gas and being safer. At the same time, as the nitrogen oxides in the flue gas undergo a catalytic reduction reaction with ammonia, the nitrogen oxides are reduced to non-toxic gases and discharged, thereby reducing the pollution problem after the flue gas is discharged.

[0091] The technical features of the above-mentioned embodiments can be combined arbitrarily. In order to make the description concise, not all possible combinations of the technical features in the above-mentioned embodiments are described. However, as long as the combination of these technical features does not exist, the above-mentioned embodiments only express several implementation methods of the present invention. The description is relatively specific and detailed, but it cannot be understood as a limitation on the scope of the invention patent. It should be pointed out that for ordinary technicians in this field, several variations and improvements can be made without departing from the concept of the present invention, which all belong to the protection scope of the present invention. Therefore, the protection scope of the patent of the present invention shall be based on the attached claims.

Claims

1. A tempering furnace for heat treatment process, comprising a tempering furnace body, a tempering chamber is provided in the tempering furnace body, a base (1) is provided in the tempering chamber, and the tempering furnace body comprises: A smoke exhaust pipe (2), one end of which passes through the tempering furnace body and is connected to the tempering chamber, and is used to exhaust smoke in the tempering chamber; It is characterized in that the tempering furnace body also includes: A reaction unit (3), wherein the reaction unit (3) is connected to the other end of the smoke exhaust pipe (2) and receives smoke exhausted from the smoke exhaust pipe (2); A pressurizing unit (4), the pressurizing unit (4) being located below the reaction unit (3), cooperating with the reaction unit (3), and being connected to the tempering chamber to pressurize the tempering furnace; The reaction unit (3) comprises: A reaction chamber (31), the reaction chamber (31) being connected to one end of the smoke exhaust pipe (2) and being fixedly sealed at the connection point; A feed pipe (32), one end of which is connected to the reaction chamber (31) and is fixedly sealed at the connection point, and provides reactants to the reaction chamber (31). A mixture of ammonia and oxygen at room temperature is injected into the reaction chamber (31) through the feed pipe (32) to perform a catalytic reduction reaction, the chemical equation of which is: 4NO + 4NH3 + O2 → 4N2 + 6H2O; 6NO+4NH3 →5N2 +6H2O; 6NO2 + 8NH3 → 7N2 + 12H2O; 2NO2 + 4NH3 + O2 → 3N2 + 6H2O; An exhaust pipe (33), one end of which is in communication with the reaction chamber (31) and is fixedly sealed at the communication point, and exhausts gas to the outside after the reaction in the reaction chamber (31) is completed; An electrically controlled valve (34), wherein the electrically controlled valve (34) is electrically connected to a concentration sensor, and the electrically controlled valve (34) and the concentration sensor are arranged at the communication ports between the smoke exhaust pipe (2), the feed pipe (32) and the exhaust pipe (33) and the reaction chamber (31); The pressurizing unit (4) comprises: A pressurizing pipe (41), one end of which is in communication with the reaction chamber (31), and the other end of which passes through the tempering furnace body and is in communication with the tempering chamber. The two ends are fixedly sealed at the connection points, and a one-way valve is provided at the communication port between the pressurizing pipe (41) and the tempering chamber; A fixing rod (42), the fixing rod (42) being fixedly connected to the inner wall of one end of the pressure tube (41) close to the tube opening; A tension spring (43), wherein the upper end of the tension spring (43) is fixedly connected to the fixing rod (42); A piston (44), wherein the upper end surface of the piston (44) is fixedly connected to the lower end of the tension spring (43), and the piston (44) is slidably and sealingly connected to the inner wall of the pressure tube (41); An air intake pipe (45), the air intake pipe (45) is located below the piston (44), is connected to the pressurizing pipe (41), and is fixedly sealed and connected at the connecting point; a one-way valve is provided at the connecting port between the air intake pipe (45) and the pressurizing pipe (41); The fixing rod (42) and the tension spring (43) are made of high temperature resistant materials; The high temperature resistant elastic material may be heat resistant steel; The tempering chamber also includes an impeller (5), the impeller (5) is rotatably connected to the base (1), and the top position of the impeller (5) corresponds to the communication port between the pressure pipe (41) and the tempering chamber; The upper surface of the base (1) is rotatably connected to a sliding seat (6), and the sliding seat (6) is fixedly connected to the rotating shaft of the impeller (5); The upper surface of the sliding seat (6) is provided with grooves (7), and the grooves (7) are evenly distributed around the rotating shaft of the impeller (5); The highest point of the sliding seat (6) is lower than the lowest point of the impeller (5).

2. The tempering furnace for heat treatment process according to claim 1, characterized in that: The tempering furnace body is outer-coated with a heat-insulating layer (8).

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