Catalytic apparatus for nitric acid production exhaust gas

Abstract

The present application relates to the field of waste gas treatment, especially to a kind of catalytic equipment of nitric acid generation exhaust gas.The present application provides a kind of catalytic equipment of nitric acid generation exhaust gas, which can prevent nitric acid exhaust gas from leaking out during catalysis, and can be heated twice.The present application provides such a kind of catalytic equipment of nitric acid generation exhaust gas, including support seat, catalytic tank, gas inlet pipe, heater and gas outlet pipe, etc.;support seat is connected with catalytic tank, one side of catalytic tank is communicated with gas inlet pipe, gas inlet pipe penetrates support seat, heater is installed in catalytic tank, the other side of catalytic tank is communicated with gas outlet pipe for discharging the gas after catalysis.By staff screwing sealing cap to make that placing box opens and closes, under the action of sealing cap, nitric acid exhaust gas can be prevented from leaking out, then heating tube and heater operate to heat nitric acid exhaust gas, nitric acid exhaust gas is then floated into catalytic tank and reacts with catalyst, so as to achieve the purpose of accelerating the purification of nitric acid exhaust gas.

Description

Technical Field

[0001] This invention relates to the field of waste gas treatment, and more particularly to a catalytic device for generating nitric acid waste gas. Background Technology

[0002] Nitric acid is a monoprotic inorganic strong acid with strong oxidizing and corrosive properties. It is one of the six major inorganic strong acids and an important chemical raw material. Its aqueous solution is commonly known as nitric acid solution or ammonia nitrogen solution. The main components of nitric acid waste gas are nitrogen oxides, including nitric oxide, nitrogen dioxide, dinitrogen trioxide, and dinitrogen tetroxide. Direct discharge of nitric acid waste gas will cause significant environmental pollution.

[0003] Currently, existing catalytic technologies for nitric acid waste gas generally use catalysts to treat the waste gas. During the catalyst addition process, workers need to open the catalytic tank to add the catalyst, which may cause nitric acid waste gas to leak out, resulting in environmental pollution. In addition, the nitric acid waste gas needs to be heated during the catalytic process, but it is usually only heated once, resulting in poor catalytic effect and reduced catalytic efficiency.

[0004] To achieve the above objectives, there is an urgent need to design a catalytic device that can prevent the leakage of nitric acid waste gas during the catalytic process and can perform secondary heating of the nitric acid generation waste gas. Summary of the Invention

[0005] The purpose of this invention is to overcome the shortcomings of existing technologies, such as the potential leakage of waste gas when adding catalysts and the fact that heating is usually only performed once, resulting in poor catalytic effect. The technical problem to be solved is to provide a catalytic device for generating nitric acid waste gas that can prevent leakage of nitric acid waste gas during the catalytic process and can perform secondary heating.

[0006] The technical solution of the present invention is as follows: a catalytic device for generating nitric acid waste gas, comprising a support base, a catalytic tank, an inlet pipe, a heater, an outlet pipe, a feed pipe, a connecting pipe, a placement plate, a blocking mechanism, and a heating mechanism. The catalytic tank is connected to the support base, and an inlet pipe is connected to one side of the catalytic tank, passing through the support base. A heater is installed inside the catalytic tank, and an outlet pipe for discharging the catalytically produced gas is connected to the other side of the catalytic tank. A feed pipe for feeding the catalyst is connected to the side of the catalytic tank near the outlet pipe. The feed pipe is funnel-shaped, wider at the top and narrower at the bottom, and a connecting pipe is connected to the feed pipe. A placement plate is placed inside the catalytic tank, and the connecting pipe is located above the placement plate. A blocking mechanism for controlling the feeding is provided on the feed pipe, and a heating mechanism for heating the waste gas is provided on the inlet pipe.

[0007] In one embodiment, the blocking mechanism includes a placement box and a sealing cover. The placement box is rotatably connected to the feeding pipe, and the sealing cover is rotatably connected to the placement box. The bottom of the placement box has a discharge hole, and the top of the feeding pipe has a feeding hole. The discharge hole rotates to communicate with the feeding hole.

[0008] In one embodiment, the heating mechanism includes a protective shell, retaining rings, screws, and a heating tube. The protective shell is connected to the air inlet pipe, and retaining rings are symmetrically connected to the protective shell. The two retaining rings are connected by screws. A heating tube for heating the exhaust gas is installed on the air inlet pipe, and the heating tube is located inside the protective shell.

[0009] In one embodiment, a control mechanism for controlling the entry and exit of gas is also included. The control mechanism includes a servo motor, a rotating shaft, a transmission assembly, a crank, and a baffle. The servo motor is mounted on one side of the support base. The rotating shaft is connected to the output shaft of the servo motor. Cranks are rotatably connected to both the intake pipe and the exhaust pipe. Baffles for controlling the entry and exit of gas are connected to the cranks. The baffles are located inside the intake pipe and the exhaust pipe, respectively. A transmission assembly is symmetrically connected between the rotating shaft and the crank. The transmission assembly consists of two pulleys and a flat belt. Pulleys are connected to both the crank and the rotating shaft. A flat belt is wound around the two pulleys.

[0010] In one embodiment, a feeding mechanism for assisting catalyst feeding is also included. The feeding mechanism includes a first guide rail, a sliding plate, a slide rod, a first elastic element, a connecting rod, a second elastic element, a third elastic element, and a second guide rail. The top of the catalyst tank is connected to the first guide rail. A sliding plate is slidably connected inside the first guide rail. A slide rod for assisting catalyst feeding is slidably connected to the sliding plate. The upper crank rotates and contacts the slide rod. A first elastic element is connected between the slide rod and the sliding plate. The first elastic element is sleeved on the slide rod. A second guide rail is connected to the placement box. A connecting rod is slidably connected to the second guide rail. The connecting rod is fixedly connected to the slide rod. A second elastic element is connected between the connecting rod and the placement box. A third elastic element is connected between the sliding plate and the first guide rail.

[0011] In one embodiment, a cooling mechanism for cooling the catalytically catalyzed gas is also included. The cooling mechanism includes an exhaust fan and a cooler. An exhaust fan is installed inside the gas outlet pipe, and coolers for cooling the catalytically catalyzed gas are symmetrically installed on the gas outlet pipe.

[0012] In one embodiment, a metering mechanism is further included for controlling the amount of catalyst fed. The metering mechanism includes a wedge rod, a guide frame, a wedge block, and a fourth elastic element. The wedge rod is slidably connected to the feed pipe, and the guide frame is connected inside the feed pipe. The wedge block for controlling the amount of catalyst fed is slidably connected to the guide frame. The wedge rod moves to contact the wedge block. A stop block is connected to the bottom of the wedge block and contacts the feed pipe. The fourth elastic element is connected between the wedge block and the guide frame.

[0013] In one embodiment, the stop is conical.

[0014] The beneficial effects are as follows: 1. The staff can open and close the placement box by turning the sealing cover. Under the action of the sealing cover, the leakage of nitric acid waste gas can be prevented. Then, the heating tube and heater operate to heat the nitric acid waste gas. The nitric acid waste gas then floats into the catalytic tank and reacts with the catalyst, thereby achieving the purpose of accelerating the purification of nitric acid waste gas.

[0015] 2. The output shaft of the servo motor rotates, causing the upper crank to rotate and contact the slide rod, pushing it to slide backward, thereby connecting the discharge port and the feed port. The catalyst then falls into the placement tray. When the upper crank continues to rotate and disengages from the slide rod, the slide rod returns to its original position, thus deconnecting the discharge port and the feed port. This reciprocating motion achieves the purpose of quantitatively feeding the catalyst.

[0016] 3. By operating the exhaust fan and cooler, the nitric acid waste gas can be quickly discharged after cooling, thus achieving rapid discharge of the nitric acid waste gas. Attached Figure Description

[0017] Figure 1 This is a three-dimensional structural diagram of the present invention.

[0018] Figure 2 This is a schematic diagram of a partial three-dimensional cross-sectional structure of the present invention.

[0019] Figure 3 This is a schematic diagram of a second partial three-dimensional cross-sectional structure of the present invention.

[0020] Figure 4 This is a three-dimensional cross-sectional view of the blocking mechanism of the present invention.

[0021] Figure 5 This is a three-dimensional cross-sectional view of the heating mechanism of the present invention.

[0022] Figure 6 This is a three-dimensional structural diagram of the control mechanism of the present invention.

[0023] Figure 7 This is a three-dimensional structural diagram of the feeding mechanism of the present invention.

[0024] Figure 8 An enlarged structural schematic diagram of part A of this invention.

[0025] Figure 9 This is a three-dimensional cross-sectional view of the cooling mechanism of the present invention.

[0026] Figure 10 This is a three-dimensional cross-sectional view of the measurement control mechanism of the present invention.

[0027] The components in the diagram are labeled as follows: 1-Support base, 2-Catalyst tank, 3-Inlet pipe, 4-Heater, 5-Outlet pipe, 6-Feed pipe, 601-Connecting pipe, 602-Placement tray, 7-Blocking mechanism, 701-Placement box, 702-Sealing cover, 703-Discharge hole, 704-Inlet hole, 8-Heating mechanism, 801-Protective shell, 802-Fixing ring, 803-Screw, 804-Heating tube, 9-Control mechanism, 901-Servo motor, 902-Shaft, 903-Transmission assembly, 904-Crank. 905-Baffle, 10-Feeding mechanism, 1001-First guide rail, 1002-Sliding plate, 1003-Slide rod, 1004-First elastic element, 1005-Connecting rod, 1006-Second elastic element, 1007-Third elastic element, 1008-Second guide rail, 11-Cooling mechanism, 1101-Exhaust fan, 1102-Cooler, 12-Measurement control mechanism, 1201-Wedge rod, 1202-Guide frame, 1203-Wedge block, 1204-Stop block, 1205-Fourth elastic element. Detailed Implementation

[0028] The present invention will be further described below with reference to the embodiments shown in the accompanying drawings.

[0029] Example 1

[0030] A catalytic device for generating nitric acid waste gas, see reference. Figures 1-3 As shown, the system includes a support base 1, a catalytic converter 2, an inlet pipe 3, a heater 4, an outlet pipe 5, a feed pipe 6, a connecting pipe 601, a placement tray 602, a blocking mechanism 7, and a heating mechanism 8. The catalytic converter 2 is bolted to the support base 1. The inlet pipe 3 is connected to one side of the catalytic converter 2 and passes through the support base 1. The heater 4 is bolted to the inside of the catalytic converter 2. The outlet pipe 5 is connected to the other side of the catalytic converter 2 and is used to discharge the catalytically catalyzed gas. The feed pipe 6 is connected to the side of the catalytic converter 2 near the outlet pipe 5 and is used to feed the catalyst. The feed pipe 6 is funnel-shaped, wider at the top and narrower at the bottom. The connecting pipe 601 is connected to the feed pipe 6. The placement tray 602 is placed inside the catalytic converter 2, and the connecting pipe 601 is located above the placement tray 602. The feed pipe 6 is equipped with a blocking mechanism 7, which is used to control the feeding. The inlet pipe 3 is equipped with a heating mechanism 8, which is used to heat the exhaust gas.

[0031] See Figure 1 and Figure 4 As shown, the blocking mechanism 7 includes a placement box 701 and a sealing cover 702. The placement box 701 is rotatably connected to the feeding pipe 6, and the sealing cover 702 is rotatably connected to the placement box 701. The bottom of the placement box 701 has a discharge hole 703, and the top of the feeding pipe 6 has a feeding hole 704. The discharge hole 703 is rotatably connected to the feeding hole 704.

[0032] See Figure 1 and Figure 5 As shown, the heating mechanism 8 includes a protective shell 801, a fixing ring 802, a screw 803, and a heating tube 804. The protective shell 801 is fixed to the air inlet pipe 3 by bolts. The fixing rings 802 are symmetrically connected to the protective shell 801. The two fixing rings 802 are connected by screws 803. The heating tube 804 is connected to the air inlet pipe 3 by bolts. The heating tube 804 is used to heat the exhaust gas and is located inside the protective shell 801.

[0033] Initially, the outlet pipe 5 is closed. When catalytic treatment of the nitric acid waste gas is required, the operator removes the screw 803 from the fixing ring 802, then inserts the nitric acid waste gas pipe into the fixing ring 802. The operator then reinserts the screw 803 into the fixing ring 802, and then unscrews the sealing cap 702, opening the placement box 701. The operator then pours the catalyst into the placement box 701. The operator reverses the rotation of the sealing cap 702, closing the placement box 701. The operator then rotates the placement box 701 to connect the outlet port 703 with the inlet port 704, allowing the catalyst to fall through the outlet port 703 into the feed pipe 6. The catalyst then falls through the connecting pipe 601 into the placement tray 602. The operator reverses the rotation of the placement box 701 to open the outlet port 704. 03 is no longer connected to the feed port 704. At this time, the staff opens the switch of the external pipeline, and the nitric acid waste gas floats into the catalytic tank 2 to react with the catalyst, thereby achieving the purpose of purifying the nitric acid waste gas. At the same time, the staff starts the heating pipe 804 and the heater 4. While the nitric acid waste gas floats into the catalytic tank 2 through the air inlet pipe 3, the heating pipe 804 and the heater 4 operate to heat the nitric acid waste gas, thereby achieving the purpose of accelerating the catalysis of the nitric acid waste gas. The staff opens the air outlet pipe 5, and the catalyzed nitric acid waste gas is discharged through the air outlet pipe 5. After the catalysis of the nitric acid waste gas is completed, the staff closes the heating pipe 804 and the heater 4 to stop the operation. Then the staff removes the screw 803 from the fixing ring 802, and then removes the nitric acid waste gas pipeline from the fixing ring 802.

[0034] Example 2

[0035] Based on Example 1, see [link to Example 1] Figure 1 and Figure 6 As shown, it also includes a control mechanism 9, which is used to control the gas inlet and outlet. The control mechanism 9 includes a servo motor 901, a rotating shaft 902, a transmission assembly 903, a crank 904, and a baffle 905. The servo motor 901 is bolted to one side of the support base 1. The rotating shaft 902 is connected to the output shaft of the servo motor 901 via a coupling. The crank 904 is rotatably connected to both the intake pipe 3 and the outlet pipe 5. The baffle 905 is welded to the crank 904. The baffle 905 is used to control the gas inlet and outlet. The baffle 905 is located in the intake pipe 3 and the outlet pipe 5, respectively. The transmission assembly 903 is symmetrically connected between the rotating shaft 902 and the crank 904. The transmission assembly 903 consists of two pulleys and a flat belt. The crank 904 and the rotating shaft 902 are both connected to pulleys, and the flat belt is wound around the two pulleys.

[0036] See Figure 1 , Figure 7 and Figure 8 As shown, it also includes a feeding mechanism 10, which is used to assist in the feeding of catalyst. The feeding mechanism 10 includes a first guide rail 1001, a sliding plate 1002, a sliding rod 1003, a first elastic element 1004, a connecting rod 1005, a second elastic element 1006, a third elastic element 1007, and a second guide rail 1008. The top of the catalyst tank 2 is bolted to the first guide rail 1001. The sliding plate 1002 is slidably connected inside the first guide rail 1001. The sliding rod 1003 is slidably connected on the sliding plate 1002. The sliding rod 1003 is used to assist in the feeding of catalyst. The upper crank 904 rotates and contacts the slide rod 1003. A first elastic element 1004 is connected between the slide rod 1003 and the sliding plate 1002. The first elastic element 1004 is sleeved on the slide rod 1003. A second guide rail 1008 is connected to the placement box 701. A connecting rod 1005 is slidably connected to the second guide rail 1008. The connecting rod 1005 is fixedly connected to the slide rod 1003. A second elastic element 1006 is connected between the connecting rod 1005 and the placement box 701. A third elastic element 1007 is connected between the sliding plate 1002 and the first guide rail 1001.

[0037] When nitric acid waste gas catalysis is required, the operator starts the servo motor 901. The output shaft of the servo motor 901 rotates, driving the rotating shaft 902 to rotate. The rotating shaft 902 then drives the transmission assembly 903 to rotate, which in turn causes the crank 904 to rotate. The crank 904 rotates, causing the baffle 905 to rotate, thereby simultaneously opening the inlet pipe 3 and the outlet pipe 5. The nitric acid waste gas then flows into the catalytic tank 2 through the inlet pipe 3. The upper crank 904 rotates and contacts the slide rod 1003, pushing the slide rod 1003 backward. The first elastic element 1004 is compressed, and the slide rod 1003 moves backward. The sliding motion causes the connecting rod 1005 to slide backward, pushing the second guide rail 1008 to move. The second elastic element 1006 deforms, and the movement of the second guide rail 1008 causes the placement box 701 to rotate, connecting the discharge port 703 with the inlet port 704. The catalyst then falls into the placement tray 602. Because the rotation angle of the placement box 701 is small at this time, the amount of catalyst falling is relatively small. If more catalyst is needed, the operator can push the sliding plate 1002 left or right, causing the third elastic element 1007 to deform. The operator then uses tools to fix the sliding plate 1002 in place. This increases the rotation angle of the placement box 701, resulting in a greater amount of catalyst falling. As the upper crank 904 continues to rotate, it drives the baffle 905 to rotate, thus closing the inlet pipe 3 and outlet pipe 5. Simultaneously, the upper crank 904 disengages from the slide rod 1003, causing the first elastic element 1004 to reset, which in turn resets the slide rod 1003. The second elastic element 1006 also resets, causing the connecting rod 1005 to reset. The reset of the connecting rod 1005 resets the second guide rail 1008, which in turn drives the placement box 701 to rotate, opening the discharge port 703. The feed port 704 is no longer connected, and the process repeats, thus achieving the purpose of quantitative feeding of the catalyst. When the crank 904 rotates and the baffle 905 opens again, the catalyzed nitric acid waste gas is discharged through the outlet pipe 5, while the uncatalyzed nitric acid waste gas also drifts into the catalytic tank 2 through the inlet pipe 3. This cycle repeats, thereby achieving rapid catalysis of the nitric acid waste gas. After the catalysis of the nitric acid waste gas is completed, the operator turns off the servo motor 901 to stop the operation. Then the operator removes the tool from the sliding plate 1002, and the third elastic element 1007 resets, causing the sliding plate 1002 to reset as well.

[0038] Example 3

[0039] Based on Example 2, see [link / reference] Figure 1 and Figure 9As shown, it also includes a cooling mechanism 11, which is used to cool the catalytic gas. The cooling mechanism 11 includes an exhaust fan 1101 and a cooler 1102. The exhaust fan 1101 is bolted to the inside of the gas outlet pipe 5, and two coolers 1102 are bolted to the gas outlet pipe 5. The coolers 1102 are used to cool the catalytic gas.

[0040] When it is necessary to discharge the catalytically treated nitric acid waste gas, the staff starts the exhaust fan 1101 and the cooler 1102. The operation of the exhaust fan 1101 causes the nitric acid waste gas to be discharged quickly through the exhaust pipe 5. When the nitric acid waste gas is discharged, it passes through the cooler 1102, which cools the nitric acid waste gas. After all the nitric acid waste gas has been discharged, the staff turns off the exhaust fan 1101 and the cooler 1102 to stop the operation.

[0041] See Figure 1 and Figure 10 As shown, it also includes a quantity control mechanism 12, which is used to control the amount of catalyst fed. The quantity control mechanism 12 includes a wedge rod 1201, a guide frame 1202, a wedge block 1203, and a fourth elastic element 1205. The wedge rod 1201 is slidably connected to the feed pipe 6. The guide frame 1202 is welded inside the feed pipe 6. The wedge block 1203 is slidably connected to the guide frame 1202. The wedge block 1203 is used to control the amount of catalyst fed. The wedge rod 1201 moves to contact the wedge block 1203. A stop block 1204 is welded to the bottom of the wedge block 1203. The stop block 1204 is conical and contacts the feed pipe 6. The fourth elastic element 1205 connects the wedge block 1203 and the guide frame 1202.

[0042] Initially, the wedge rod 1201 is in contact with the wedge block 1203, and the wedge rod 1201 is fixed by the tool. The fourth elastic element 1205 is in a deformed state. When it is necessary to add the catalyst to the catalyst tank 2, the operator removes the tool from the wedge rod 1201. The fourth elastic element 1205 then resets, causing the wedge block 1203 to move upward. The upward movement of the wedge block 1203 pushes the wedge rod 1201 backward to reset. At the same time, the reset of the wedge block 1203 also resets the stop block 1204. The stop block 1204 no longer engages with the feed pipe 6, and the catalyst then flows out of the feed pipe. 6 falls into the placement tray 602. The worker pushes the wedge rod 1201 forward and uses a tool to fix it. The wedge rod 1201 slides forward and contacts the wedge block 1203. Then the wedge rod 1201 pushes the wedge block 1203 to move downward. The fourth elastic element 1205 deforms. The wedge block 1203 moves downward and drives the stop block 1204 to move downward. At this time, the feed pipe 6 is blocked by the stop block 1204, and the catalyst no longer falls from the feed pipe 6. Since the stop block 1204 is conical, it can better cooperate with the feed pipe 6, thereby enhancing the sealing of the feed pipe 6.

[0043] The above description is merely a specific embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any variations or substitutions that can be easily conceived by those skilled in the art within the technical scope disclosed in the present invention should be included within the scope of protection of the present invention. Therefore, the scope of protection of the present invention should be determined by the scope of the claims.

Claims

1. A catalytic device for generating nitric acid waste gas, characterized in that, The system includes a support base (1), a catalytic converter (2), an inlet pipe (3), a heater (4), an outlet pipe (5), a discharge pipe (6), a connecting pipe (601), a placement tray (602), a blocking mechanism (7), and a heating mechanism (8). The catalytic converter (2) is connected to the support base (1). One side of the catalytic converter (2) is connected to the inlet pipe (3), which passes through the support base (1). The heater (4) is installed inside the catalytic converter (2). The other side of the catalytic converter (2) is connected to a device for discharging the catalytically catalyzed gas. The gas outlet pipe (5) is connected to the side of the catalytic tank (2) near the gas outlet pipe (5) via a feeding pipe (6) for feeding the catalyst. The feeding pipe (6) is funnel-shaped with a wider top and a narrower bottom. A connecting pipe (601) is connected to the feeding pipe (6). A placement plate (602) is placed inside the catalytic tank (2). The connecting pipe (601) is located above the placement plate (602). A blocking mechanism (7) for controlling the feeding is provided on the feeding pipe (6). A heating mechanism (8) for heating the exhaust gas is provided on the gas inlet pipe (3). The blocking mechanism (7) includes a placement box (701) and a sealing cover (702). The placement box (701) is rotatably connected to the feeding pipe (6). The sealing cover (702) is rotatably connected to the placement box (701). The bottom of the placement box (701) has a discharge hole (703). The top of the feeding pipe (6) has a feed hole (704). The discharge hole (703) rotates to communicate with the feed hole (704). It also includes a control mechanism (9) for controlling the entry and exit of gas. The control mechanism (9) includes a servo motor (901), a rotating shaft (902), a transmission assembly (903), a crank (904), and a baffle (905). The servo motor (901) is installed on one side of the support base (1). The rotating shaft (902) is connected to the output shaft of the servo motor (901). The crank (904) is rotatably connected to the inlet pipe (3) and the outlet pipe (5). The baffle (905) for controlling the entry and exit of gas is connected to the crank (904). The baffle (905) is located in the inlet pipe (3) and the outlet pipe (5) respectively. The transmission assembly (903) is symmetrically connected between the rotating shaft (902) and the crank (904). The transmission assembly (903) consists of two pulleys and a flat belt. The crank (904) and the rotating shaft (902) are both connected to pulleys. The flat belt is wound around the two pulleys. It also includes a feeding mechanism (10) for assisting catalyst feeding. The feeding mechanism (10) includes a first guide rail (1001), a sliding plate (1002), a slide rod (1003), a first elastic element (1004), a connecting rod (1005), a second elastic element (1006), a third elastic element (1007), and a second guide rail (1008). The top of the catalyst tank (2) is connected to the first guide rail (1001). The sliding plate (1002) is slidably connected inside the first guide rail (1001). The slide rod (1003) for assisting catalyst feeding is slidably connected on the sliding plate (1002). The upper crank (904) rotates... The sliding plate (1002) is connected to the sliding rod (1003). A first elastic element (1004) is connected between the sliding rod (1003) and the sliding plate (1002). The first elastic element (1004) is sleeved on the sliding rod (1003). A second guide rail (1008) is connected to the placement box (701). A connecting rod (1005) is slidably connected to the second guide rail (1008). The connecting rod (1005) is fixedly connected to the sliding rod (1003). A second elastic element (1006) is connected between the connecting rod (1005) and the placement box (701). A third elastic element (1007) is connected between the sliding plate (1002) and the first guide rail (1001).

2. The catalytic device for generating nitric acid waste gas as described in claim 1, characterized in that, The heating mechanism (8) includes a protective shell (801), a fixing ring (802), a screw (803) and a heating tube (804). The protective shell (801) is connected to the air inlet pipe (3). The fixing rings (802) are symmetrically connected to the protective shell (801). The two fixing rings (802) are connected by screws (803). The heating tube (804) for heating the exhaust gas is installed on the air inlet pipe (3). The heating tube (804) is located inside the protective shell (801).

3. The catalytic device for generating nitric acid waste gas as described in claim 2, characterized in that, It also includes a cooling mechanism (11) for cooling the catalytic gas. The cooling mechanism (11) includes an exhaust fan (1101) and a cooler (1102). An exhaust fan (1101) is installed inside the gas outlet pipe (5), and a cooler (1102) for cooling the catalytic gas is symmetrically installed on the gas outlet pipe (5).

4. The catalytic device for generating nitric acid waste gas as described in claim 3, characterized in that, It also includes a quantity control mechanism (12) for controlling the amount of catalyst fed. The quantity control mechanism (12) includes a wedge rod (1201), a guide frame (1202), a wedge block (1203) and a fourth elastic element (1205). The wedge rod (1201) is slidably connected to the feed pipe (6). The guide frame (1202) is connected inside the feed pipe (6). The wedge block (1203) for controlling the amount of catalyst fed is slidably connected to the guide frame (1202). The wedge rod (1201) moves to contact the wedge block (1203). A stop block (1204) is connected to the bottom of the wedge block (1203). The stop block (1204) contacts the feed pipe (6). The fourth elastic element (1205) is connected between the wedge block (1203) and the guide frame (1202).

5. The catalytic device for generating nitric acid waste gas as described in claim 4, characterized in that, The stop block (1204) is conical.

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