A detection method of tail gas of nitric acid production

Abstract

The application discloses a kind of detection methods of tail gas of nitric acid production, the top of the base is rotatably provided with rotary drum, the surface of the rotary drum is fixedly connected with ring frame, and the application relates to tail gas detection technical field.The detection method of tail gas of nitric acid production is provided with continuous rotation detection mechanism, dehydration regeneration mechanism and container acceleration replacement mechanism on the top of the base, so that the device can be automatically switched by the cooperation of continuous rotation detection mechanism, dehydration regeneration mechanism and container acceleration replacement mechanism, and the detection cylinder can be continuously switched, and the gas sample can be continuously detected, and the desiccant particles in the filler net frame are dried and regenerated simultaneously during the detection process, to ensure that the desiccant particles can maintain good dehumidification performance during continuous use, and the used detection cylinder is replaced quickly during the detection period, so that it can be used continuously in the subsequent automatic detection process on the basis of ensuring cleanliness.

Description

Technical Field

[0001] This invention relates to the field of exhaust gas detection technology, specifically a method for detecting exhaust gas from nitric acid production. Background Technology

[0002] Nitric acid production exhaust gas contains a certain concentration of nitrogen oxides, which pollute the atmosphere. To prevent nitrogen oxide emissions from exceeding standards, the gas is sampled and tested regularly. However, this requires the use of detection devices. Traditional detection devices can only test one gas sample at a time, and each test requires a long period of replacement before they can be put back into use. This makes it inconvenient for the device to continuously and efficiently test gas samples. Therefore, a detection method for nitric acid production exhaust gas is proposed to solve the existing problems. Summary of the Invention

[0003] To address the shortcomings of existing technologies, this invention provides a method for detecting tail gas from nitric acid production, solving the problem that the equipment is inconvenient for continuous and efficient detection of gas samples.

[0004] To achieve the above objectives, the present invention provides the following technical solution: a method for detecting nitric acid production tail gas, specifically comprising the following steps:

[0005] Step 1, Pre-drying test: The gas to be tested, which is connected to the inlet pipe joint, is dried and dehumidified by the dehumidification cylinder, packing mesh frame and dehumidification particles inside the packing mesh frame in the dehydration and regeneration mechanism. The dehumidified gas is then passed into the inside of the test cylinder for testing.

[0006] Step 2, Continuous Rotation Testing: Through the intermittent operation of the continuous rotation testing mechanism at the top of the base, several testing cylinders are rotated to ensure that a clean testing cylinder can be used as the testing container for each test.

[0007] Step 3, Dehydration and Regeneration: The continuous rotating testing mechanism operates intermittently to connect the used dehumidifier cylinder to the ventilation chamber, and during the testing process, the dehumidifier particles that have adsorbed moisture inside the packing mesh frame in the standby state are dried and regenerated.

[0008] Step 4, Container Accelerated Replacement: The intermittent operation of the continuous rotation detection mechanism synchronously controls the connection between the used detection cylinder and the telescopic tube in the container accelerated replacement mechanism. This allows the standby detection cylinder to be actively replaced with air during gas detection, preventing residue inside the detection cylinder from affecting subsequent continuous detection.

[0009] Preferably, a rotating cylinder is rotatably mounted on the top of the base, and a ring frame is fixedly connected to the surface of the rotating cylinder. Several detection cylinders are slidably connected to the outer surface of the ring frame through a T-shaped groove. An oxygen detection probe and a nitrogen dioxide detection probe are respectively installed on the top and bottom of the surface of the detection cylinder. A continuous rotation detection mechanism is provided on the top of the base. A dehydration and regeneration mechanism that is used in conjunction with the continuous rotation detection mechanism is provided on the top of the base. A container accelerated replacement mechanism is provided on the top of the base.

[0010] Preferably, the continuous rotation detection mechanism includes a misalignment guide frame, which is fixedly installed on the top of the base. The surface of the detection cylinder is rotatably provided with guide rollers that slide and adapt to the misalignment guide frame. An electric telescopic rod is fixedly connected to the top of the base. Several arc-shaped guide grooves are equidistantly opened around the inner wall of the rotating cylinder. A storage cylinder is fixedly connected to the surface of the extension end of the electric telescopic rod. A sliding block is slidably connected inside the storage cylinder. A third return spring is fixedly connected between the sliding block and the storage cylinder. An extrusion column that matches the arc-shaped guide grooves is rotatably provided on the surface of the sliding block. An inclined groove is opened between two adjacent arc-shaped guide grooves.

[0011] Preferably, the dehydration and regeneration mechanism includes a hot air blower, which is fixedly mounted on the top of the base by a bracket. The outlet end of the hot air blower is connected to a ventilation chamber. A column is fixedly connected to the top of the extension end of the electric telescopic rod. A perforated cross plate is rotatably provided on the surface of the column. Several dehumidification cylinders are fixedly connected to the surface of the perforated cross plate. A packing mesh frame is installed inside the dehumidification cylinder. Several limiting columns that slide and adapt to the perforated cross plate are fixedly connected at equal intervals around the top of the ring frame.

[0012] Preferably, the container acceleration replacement mechanism includes a fan, which is fixedly mounted on the top of the base. The outlet end of the fan is connected to an air outlet pipe. A telescopic tube for use with the detection cylinder is slidably mounted on the surface of the air outlet pipe. A vertical plate is fixedly connected to the top of the base. A toothed frame is slidably mounted on one side of the vertical plate. A gear that meshes with the toothed frame is rotatably mounted on one side of the vertical plate. A toothed plate that meshes with the gear is fixedly connected to the front side of the telescopic tube. A lower pressure plate for use with the toothed frame is fixedly connected to the surface of the dehumidification cylinder.

[0013] Preferably, the top of the rotating cylinder is equipped with several control buttons via a recessed column, the surface of the column is fixedly connected with a stop plate, and the surface of the detection cylinder is provided with an audible and visual indicator that is compatible with the control buttons.

[0014] Preferably, a limiting slide rod is fixedly connected to one side of the telescopic tube, and a limiting slide seat that slides and adapts to the limiting slide rod is fixedly connected to the surface of the air outlet tube.

[0015] Preferably, a limiting groove is provided on one side of the vertical plate, a limiting slide is slidably connected inside the limiting groove, and a first return spring is fixedly connected between the limiting slide and the limiting groove, and the top of the limiting slide is fixedly connected to the surface of the tooth frame.

[0016] Preferably, a ratchet is fixedly connected to the surface of the rotating drum, a slide frame is fixedly connected to the top of the base, a pawl that matches the ratchet is slidably connected inside the slide frame, and a second return spring is provided between the slide frame and the pawl.

[0017] Preferably, the top of the dehumidifier cylinder is threaded with an air inlet pipe connector.

[0018] This invention provides a method for detecting tail gas from nitric acid production. Compared with existing technologies, it has the following advantages:

[0019] (1) The method for detecting the tail gas of nitric acid production is to set a continuous switching detection mechanism, a dehydration and regeneration mechanism and a container acceleration replacement mechanism on the top of the base. This allows the device to automatically and continuously switch detection cylinders through the coordinated operation of the continuous switching detection mechanism, the dehydration and regeneration mechanism and the container acceleration replacement mechanism, so as to continuously detect the gas sample. In addition, the dehumidifying particles in the packing mesh frame are dried and regenerated during the detection process to ensure that the dehumidifying particles can maintain good dehumidification performance during continuous use. In addition, the detection cylinders that have been used are quickly replaced during the detection period, so that they can be conveniently and continuously put into subsequent automatic detection processes while ensuring cleanliness.

[0020] (2) The method for detecting the tail gas of nitric acid production is to install control buttons, stop pressure plates and sound and light prompts between the rotating drum, column and detection drum, so that the assembly of the dehumidification drum with the detection drum and ventilation chamber can be completed by the above-mentioned cooperation.

[0021] (3) The method for detecting the tail gas of nitric acid production is to connect the inlet pipe joint to the dehumidifier cylinder by thread, so that the packing mesh frame can be easily removed from the dehumidifier cylinder to replace the dehumidifier particles that have reached the end of their service life.

[0022] (4) The method for detecting the tail gas of nitric acid production involves rotating a guide roller on the surface of the detection cylinder, which reduces the sliding friction resistance with the misaligned guide frame by rotating the guide roller. Attached Figure Description

[0023] Figure 1 This is a schematic diagram of the process of the present invention;

[0024] Figure 2 This is a schematic diagram of the external structure of the present invention;

[0025] Figure 3 This is a schematic diagram of the internal structure of the rotating drum of the present invention;

[0026] Figure 4 For the present invention Figure 3 A magnified view of a section at point A in the middle;

[0027] Figure 5 This is a schematic diagram of the arc-shaped guide groove structure of the present invention;

[0028] Figure 6 For the present invention Figure 3 A magnified view of a section at point B in the middle;

[0029] Figure 7 This is a schematic diagram of the internal structure of the rotating drum of the present invention from another perspective;

[0030] Figure 8 This is a demonstration diagram showing the upward movement of the perforated cross plate structure of the present invention;

[0031] Figure 9 This is a schematic diagram of the internal structure of the vertical plate of the present invention;

[0032] Figure 10 This is a schematic diagram of the internal structure of the air outlet duct of the present invention;

[0033] Figure 11 This is an unfolded view of the internal structure of the dehumidifier cylinder of the present invention;

[0034] Figure 12 This is a schematic diagram of the internal structure of the sliding frame of the present invention.

[0035] In the diagram: 1. Base; 2. Rotating drum; 3. Ring frame; 4. Detection cylinder; 5. Oxygen detection probe; 6. Nitrogen dioxide detection probe; 7. Continuous alternating detection mechanism; 701. Misaligned guide frame; 702. Guide roller; 703. Electric telescopic rod; 704. Arc-shaped guide groove; 705. Storage cylinder; 706. Sliding block; 707. Third return spring; 708. Extrusion column; 709. Inclined groove; 8. Dehydration and regeneration mechanism; 801. Hot air blower; 802. Ventilation chamber; 803. Column; 804. Perforated cross plate; 805. Dehumidifier cylinder; 806. Filler 807. Material mesh frame; 9. Limiting column; 10. Container acceleration and replacement mechanism; 11. Fan; 12. Air outlet pipe; 13. Telescopic pipe; 14. Vertical plate; 15. Toothed frame; 16. Gear; 17. Toothed plate; 18. Lower pressure plate; 19. Control button; 20. Stop pressure plate; 21. Audible and visual indicator; 22. Limiting slide bar; 33. Limiting slide seat; 44. Limiting slide groove; 55. Limiting slide frame; 66. First return spring; 77. Ratchet; 88. Slide frame; 99. Pawl; 10. Second return spring; 11. Air inlet pipe connector. Detailed Implementation

[0036] The technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention.

[0037] Please see Figures 1-12 This invention provides a technical solution: a method for detecting tail gas from nitric acid production, specifically including the following steps:

[0038] Step 1, Pre-drying test: The gas to be tested, which is connected to the air inlet pipe joint 22, is dried and dehumidified by the dehumidification cylinder 805, the packing mesh frame 806 and the dehumidification particles inside the packing mesh frame 806 in the dehydration and regeneration mechanism 8, and the dehumidified gas is then passed into the interior of the test cylinder 4 for testing.

[0039] The specific steps are as follows:

[0040] The detection gas is introduced through the inlet pipe connector 22. The gas enters the dehumidification cylinder 805 through the inlet pipe connector 22. When the gas passes through the dehumidification cylinder 805, it is dehumidified by the anhydrous calcium chloride particles in the packing mesh frame 806. The dehumidified gas enters the detection cylinder 4 and is finally detected by the oxygen detection probe 5 and the nitrogen dioxide detection probe 6.

[0041] Step 2, Continuous Rotation Testing: Through the intermittent operation of the continuous rotation testing mechanism 7 at the top of the base 1, several testing cylinders 4 are rotated to ensure that a clean testing cylinder 4 can be used as the testing container for each test.

[0042] The specific steps are as follows:

[0043] If, after testing a gas with detector cylinder 4, another clean detector cylinder 4 is needed to test another gas, taking the left detector cylinder 4 as an example: the operator starts the electric telescopic rod 703. The extended end of the electric telescopic rod 703 drives the extrusion column 708 to move inside the arc-shaped guide groove 704 through the storage cylinder 705. During the upward movement of the extrusion column 708, it will enter the spiral groove section along the vertical groove section of the arc-shaped guide groove 704. While the extrusion column 708 is moving in the vertical groove of the arc-shaped guide groove 704, the extended end of the electric telescopic rod 703 simultaneously drives the column 803 and the perforated cross plate 804 to rise. The perforated cross plate 804 rises, causing the dehumidifying cylinder 805 to disengage from the detection cylinder 4. Then, through the extrusion of the extrusion column 708 and the spiral groove, the rotating cylinder 2 causes the ring frame 3 to rotate at equal intervals. Correspondingly, the rear detection cylinder 4 moves circumferentially to the left side, and the left detection cylinder 4 moves to the front side. Then, the extension end of the electric telescopic rod 703 is reset, causing the column 803 to drive the dehumidifying cylinder 805 to reassemble with the detection cylinder 4 through the perforated cross plate 804. During the rotation of the ring frame 3, the ring frame 3 simultaneously controls the perforated cross plate 804 and the dehumidifying cylinder 805 to rotate circumferentially through the limiting column 807.

[0044] During the reset of the electric telescopic rod 703, the electric telescopic rod 703 successively controls the extrusion column 708 to descend. The descending extrusion column 708 will enter the interior of another arc-shaped guide groove 704 along the inclined groove 709, making preparations for the next equidistant rotation.

[0045] Step 3, Dehydration and Regeneration: The continuous rotation testing mechanism 7 operates intermittently to connect the used dehumidifier cylinder 805 with the ventilation chamber 802, and during the testing process, the dehumidifier particles that have adsorbed moisture inside the standby packing mesh frame 806 are dried and regenerated.

[0046] The specific steps are as follows:

[0047] When the dehumidifier cylinder 805, after being used on the left side, rotates to the front, its bottom interface aligns with the top interface of the ventilation chamber 802. During the process of the electric telescopic rod 703 extending to lower and reset, carrying the column 803, the perforated cross plate 804, and the dehumidifier cylinder 805, the dehumidifier cylinder 805 rotated to the front is assembled with the ventilation chamber 802. During this period, the hot air blower 801 is activated, which provides hot air to the ventilation chamber 802 and the interior of the dehumidifier cylinder 805, thereby drying and regenerating the anhydrous calcium chloride particles in the packing mesh frame 806, ensuring that its dehumidification performance can be guaranteed during repeated use.

[0048] Step 4, Container Accelerated Replacement: The continuous rotation detection mechanism 7 operates intermittently to synchronously control the detection cylinder 4 after use to connect with the telescopic tube 903 in the container accelerated replacement mechanism 9, so that the standby detection cylinder 4 can be actively replaced with air during gas detection, avoiding the presence of residue inside the detection cylinder 4 that would affect subsequent continuous detection.

[0049] The specific steps are as follows:

[0050] When the detection cylinder 4, after being used on the left, rotates to the front, its bottom interface will be aligned with the telescopic tube 903. During the process of the electric telescopic rod 703 extending to the end and carrying the column 803, the perforated cross plate 804, and the dehumidification cylinder 805 to descend and reset, the dehumidification cylinder 805 will cause the lower pressure plate 908 to press the toothed frame 905. The toothed frame 905 will descend under force and engage with the gear 906 and the toothed plate 907. After the dehumidification cylinder 805 reaches its lower limit position, the toothed plate 907 will engage and drive the telescopic tube 903 to assemble with the bottom interface of the detection cylinder 4. During this period, the fan 901 will be started, causing the fan 901 to accelerate the airflow to the air outlet 902, the telescopic tube 903, and the detection cylinder 4, quickly replacing the inside of the detection cylinder 4.

[0051] A rotating cylinder 2 is rotatably mounted on the top of the base 1. A ring frame 3 is fixedly connected to the surface of the rotating cylinder 2. Several detection cylinders 4 are slidably connected to the outer surface of the ring frame 3 through a T-shaped sliding groove. An oxygen detection probe 5 and a nitrogen dioxide detection probe 6 are respectively installed on the top and bottom of the surface of the detection cylinder 4. A ratchet 18 is fixedly connected to the surface of the rotating cylinder 2. A sliding frame 19 is fixedly connected to the top of the base 1. A pawl 20, which is used in conjunction with the ratchet 18, is slidably connected inside the sliding frame 19. A second return spring 21 is provided between the sliding frame 19 and the pawl 20. As explained in detail: the openings at the top and bottom of the detection cylinder 4 are both convex stepped, and the inner wall of the convex stepped opening at the bottom of the detection cylinder 4 is provided with a threaded part for connection with the exhaust pipe.

[0052] In a preferred embodiment, to facilitate continuous and efficient detection of gas samples, a continuous rotation detection mechanism 7 is provided on the top of the base 1. The continuous rotation detection mechanism 7 includes a misaligned guide frame 701, which is fixedly installed on the top of the base 1. A guide roller 702, which is rotatably adapted to the misaligned guide frame 701, is rotatably provided on the surface of the detection cylinder 4. An electric telescopic rod 703 is fixedly connected to the top of the base 1. Several arc-shaped guide grooves 704 are equidistantly opened around the inner wall of the rotating cylinder 2. As explained in detail, the arc-shaped guide grooves 704 are composed of vertical grooves and spiral grooves. A receiving cylinder 705 is fixedly connected to the surface of the extended end of the electric telescopic rod 703. A sliding block 706 is slidably connected inside the receiving cylinder 705. A third return spring 707 is fixedly connected between the sliding block 706 and the receiving cylinder 705. An extrusion column 708, which is used in conjunction with the arc-shaped guide grooves 704, is rotatably provided on the surface of the sliding block 706. An inclined groove 709 is opened between two adjacent arc-shaped guide grooves 704.

[0053] In a preferred embodiment, to facilitate the drying and regeneration of the dehumidifying particles inside the packing mesh frame 806 and ensure that its adsorption performance remains at a good level during repeated use, a dehydration and regeneration mechanism 8 is provided on the top of the base 1 to be used in conjunction with the continuous rotation detection mechanism 7. The dehydration and regeneration mechanism 8 includes a hot air blower 801, which is fixedly mounted on the top of the base 1 by a bracket. The outlet end of the hot air blower 801 is connected to a ventilation chamber 802. As explained in detail, the top interface of the ventilation chamber 802 is convex and stepped. A column 803 is fixedly connected to the top of the extension end of the electric telescopic rod 703. A perforated cross plate 804 is rotatably provided on the surface of the column 803. Several dehumidifying cylinders 805 are fixedly connected to the surface of the perforated cross plate 804. For detailed explanation: The bottom opening of the dehumidifier cylinder 805 is concave and stepped. A packing mesh frame 806 is installed inside the dehumidifier cylinder 805. For detailed explanation: The packing mesh frame 806 is filled with anhydrous calcium chloride particles to adsorb moisture in the gas sample. The packing mesh frame 806 consists of a top cover and a frame body, which are fixedly connected by bolts. Several limiting columns 807 that slide and adapt to the perforated cross plate 804 are fixedly connected at equal intervals around the top of the ring frame 3. Several control buttons 10 are installed on the top of the rotating cylinder 2 through the concave columns. A stop pressure plate 11 is fixedly connected to the surface of the column 803. The surface of the detection cylinder 4 is provided with an audible and visual indicator 12 that matches the control buttons 10. An air inlet pipe connector 22 is threadedly connected to the top of the dehumidifier cylinder 805.

[0054] In a preferred embodiment, to facilitate rapid replacement of the rotating front-side detection cylinder 4 and ensure that the detection cylinder 4 in the standby state can be quickly replaced to accelerate the reuse process, a container acceleration replacement mechanism 9 is provided on the top of the base 1. The container acceleration replacement mechanism 9 includes a fan 901, which is fixedly installed on the top of the base 1. The outlet end of the fan 901 is connected to an air outlet pipe 902. A telescopic pipe 903, which is used in conjunction with the detection cylinder 4, is slidably installed on the surface of the air outlet pipe 902. As explained in detail, the top end of the telescopic pipe 903 is concave and stepped. A vertical plate 904 is fixedly connected to the top of the base 1. A toothed bracket 905 is slidably installed on one side of the vertical plate 904. One side of the vertical plate 904 rotates... The device is equipped with a gear 906 that meshes with the toothed frame 905. The front side of the telescopic tube 903 is fixedly connected to a toothed plate 907 that meshes with the gear 906. The surface of the dehumidifying cylinder 805 is fixedly connected to a lower pressure plate 908 that is used in conjunction with the toothed frame 905. A limiting slide rod 13 is fixedly connected to one side of the telescopic tube 903. A limiting slide seat 14 that slides and adapts to the limiting slide rod 13 is fixedly connected to the surface of the air outlet 902. A limiting slide groove 15 is opened on one side of the vertical plate 904. A limiting slide bracket 16 is slidably connected inside the limiting slide groove 15. A first return spring 17 is fixedly connected between the limiting slide bracket 16 and the limiting slide groove 15. The top of the limiting slide bracket 16 is fixedly connected to the surface of the toothed frame 905.

Claims

1. A detection device for nitric acid production tail gas, characterized in that: A rotating cylinder (2) is rotatably mounted on the top of the base (1). A ring frame (3) is fixedly connected to the surface of the rotating cylinder (2). Several detection cylinders (4) are slidably connected to the outer surface of the ring frame (3) through a T-shaped groove. An oxygen detection probe (5) and a nitrogen dioxide detection probe (6) are respectively installed on the top and bottom of the surface of the detection cylinder (4). A continuous rotation detection mechanism (7) is provided on the top of the base (1). A dehydration and regeneration mechanism (8) is provided on the top of the base (1) in conjunction with the continuous rotation detection mechanism (7). A container acceleration replacement mechanism (9) is provided on the top of the base (1). The continuous rotation detection mechanism (7) includes a misaligned guide frame (701), which is fixedly installed on the top of the base (1). The surface of the detection cylinder (4) is rotatably provided with a guide roller (702) that slides and adapts to the misaligned guide frame (701). The top of the base (1) is fixedly connected with an electric telescopic rod (703). The inner wall of the rotating cylinder (2) is provided with several arc-shaped guide grooves (704) at equal intervals. The surface of the extended end of the electric telescopic rod (703) is fixedly connected with a storage cylinder (705). The inside of the storage cylinder (705) is slidably connected with a sliding block (706). A third reset spring (707) is fixedly connected between the sliding block (706) and the storage cylinder (705). The surface of the sliding block (706) is rotatably provided with an extrusion column (708) that matches the arc-shaped guide groove (704). An inclined groove (709) is provided between two adjacent arc-shaped guide grooves (704). The dehydration and regeneration mechanism (8) includes a hot air blower (801), which is fixedly mounted on the top of the base (1) by a bracket. The outlet end of the hot air blower (801) is connected to a ventilation chamber (802). The top of the extension end of the electric telescopic rod (703) is fixedly connected to a column (803). A perforated cross plate (804) is rotatably mounted on the surface of the column (803). Several dehumidifying cylinders (805) are fixedly connected to the surface of the perforated cross plate (804). A packing mesh frame (806) is installed inside the dehumidifying cylinder (805). Several limiting columns (807) that slide and adapt to the perforated cross plate (804) are fixedly connected at equal intervals around the top of the ring frame (3). The container acceleration replacement mechanism (9) includes a fan (901), which is fixedly installed on the top of the base (1). The outlet end of the fan (901) is connected to an air outlet pipe (902). A telescopic pipe (903) matching the detection cylinder (4) is slidably installed on the surface of the air outlet pipe (902). A vertical plate (904) is fixedly connected to the top of the base (1). A toothed frame (905) is slidably installed on one side of the vertical plate (904). A gear (906) meshing with the toothed frame (905) is rotatably installed on one side of the vertical plate (904). A toothed plate (907) meshing with the gear (906) is fixedly connected to the front side of the telescopic pipe (903). A lower pressure plate (908) matching the toothed frame (905) is fixedly connected to the surface of the dehumidification cylinder (805).

2. The detection device for nitric acid production tail gas according to claim 1, characterized in that: The top of the rotating cylinder (2) is equipped with several control buttons (10) through a concave column. The surface of the column (803) is fixedly connected with a stop pressure plate (11). The surface of the detection cylinder (4) is provided with an audio-visual prompter (12) that is used in conjunction with the control buttons (10).

3. The detection device for nitric acid production tail gas according to claim 2, characterized in that: One side of the telescopic tube (903) is fixedly connected to a limiting slide rod (13), and the surface of the air outlet tube (902) is fixedly connected to a limiting slide seat (14) that slides and adapts to the limiting slide rod (13).

4. The detection device for nitric acid production tail gas according to claim 3, characterized in that: A limiting groove (15) is provided on one side of the vertical plate (904). A limiting slide (16) is slidably connected inside the limiting groove (15), and a first return spring (17) is fixedly connected between the limiting slide (16) and the limiting groove (15). The top of the limiting slide (16) is fixedly connected to the surface of the tooth frame (905).

5. The detection device for nitric acid production tail gas according to claim 4, characterized in that: A ratchet (18) is fixedly connected to the surface of the rotating drum (2), and a slide frame (19) is fixedly connected to the top of the base (1). A pawl (20) that is matched with the ratchet (18) is slidably connected inside the slide frame (19), and a second return spring (21) is provided between the slide frame (19) and the pawl (20).

6. The detection device for nitric acid production tail gas according to claim 5, characterized in that: The top of the dehumidifier cylinder (805) is threaded with an air inlet pipe connector (22).

7. A method for detecting tail gas from nitric acid production, characterized in that: The detection device for nitric acid production tail gas as described in claim 6 includes the following steps: Step 1, Pre-drying test: The gas to be tested connected to the inlet pipe joint (22) is dried and dehumidified by the dehumidification cylinder (805), the packing mesh frame (806) and the dehumidification particles inside the packing mesh frame (806) in the dehydration and regeneration mechanism (8), and the dehumidified gas is then passed into the inside of the test cylinder (4) for testing; Step 2, Continuous Rotation Testing: Through the intermittent operation of the continuous rotation testing mechanism (7) at the top of the base (1), several testing cylinders (4) are rotated to ensure that a clean testing cylinder (4) can be used as the testing container for each test. Step 3, Dehydration and Regeneration: The continuous rotation testing mechanism (7) operates intermittently to connect the used dehumidifier cylinder (805) with the ventilation chamber (802), and during the testing process, the dehumidifier particles that adsorb moisture inside the standby packing mesh frame (806) are dried and regenerated. Step 4, Container Accelerated Replacement: The continuous rotation detection mechanism (7) operates intermittently to synchronously control the detection cylinder (4) after use to connect with the telescopic tube (903) in the container accelerated replacement mechanism (9), so that the standby detection cylinder (4) can be actively replaced with air during gas detection, so as to avoid the presence of residue inside the detection cylinder (4) that would affect subsequent continuous detection.

Images