Azotometer digestion tube tail gas absorption device

Abstract

The utility model discloses a tail gas absorption device for a digestion pipe of an azotometer, which relates to the technical field of azotometer auxiliary equipment and comprises a gas inlet pipe, the gas inlet pipe is connected with a gas outlet connector of the azotometer, a gas outlet end of the gas inlet pipe is connected with a main absorption box, and a gas outlet of the main absorption box is connected with an auxiliary absorption box through a gas guide pipe. The upper half portion of the main absorption box is of an arc surface structure, and the gas inlet pipe and the gas guide pipe are connected to the position, close to the upper portion, of the center of the main absorption box. The contact area and the adsorption efficiency of the tail gas and the activated carbon are optimized, the activated carbon absorption block can rotate into the solution cavity to be in contact with the chemical solution after adsorbing harmful substances in the tail gas, and when the activated carbon absorption block passes through the chemical solution, the harmful substances can be automatically desorbed after chemical reaction; and automatic regeneration and maintenance of the adsorption function of the adsorption material are realized.

Description

Technical Field

[0001] The utility model belongs to the technical field of auxiliary equipment of nitrogen determination instruments, and in particular relates to a tail gas absorption device for a digestion and boiling pipe of a nitrogen determination instrument. Background Art

[0002] A nitrogen analyzer is a laboratory instrument used to determine the total nitrogen content in a substance. It is commonly used in fields such as food, feed, soil, plant and water quality analysis. The working principle of a nitrogen analyzer is usually based on the Kjeldahl method, which digests the sample, converts the organic nitrogen in the sample into ammonia, then releases the ammonia by distillation, and uses acid titration to determine the ammonia content, thereby calculating the total nitrogen content. In the process of using the nitrogen analyzer, some exhaust gas will be generated, mainly including: ammonia, sulfur dioxide, nitrogen oxides, water vapor and some other volatile organic compounds. The direct emission of the exhaust gas of the nitrogen analyzer will cause harm to the environment and experimenters, so it is very important to treat the exhaust gas generated by the nitrogen analyzer to ensure the safety of laboratory personnel and environmental protection.

[0003] After searching, the patent authorization number is CN 215692952 U, which discloses a nitrogen analyzer digestion tube tail gas absorption device, which absorbs and treats the nitrogen analyzer digestion tail gas through two spherical activated carbon adsorption structures. Although the basic absorption work of the tail gas can be completed, the method of using only activated carbon adsorption will cause a large filtering and adsorption pressure on the activated carbon. The activated carbon needs to be replaced frequently to ensure that the tail gas of the nitrogen analyzer can be cleaned in time. Moreover, the method of using only activated carbon to absorb the tail gas is relatively single, and it cannot ensure that the harmful gases in the tail gas are completely adsorbed and removed. Utility Model Content

[0004] In view of the problems existing in the prior art, the utility model provides a tail gas absorption device for the digestion tube of a nitrogen analyzer, which provides an efficient, environmentally friendly and safe tail gas treatment solution, helps to improve the efficiency and quality of tail gas treatment, and reduces maintenance costs and environmental pollution risks.

[0005] The utility model solves the technical problem by adopting the following scheme: a tail gas absorption device for a nitrogen analyzer digestion tube, comprising an air inlet pipe, the air inlet pipe is connected to the air outlet joint of the nitrogen analyzer, a main absorption box is connected to the air outlet end of the air inlet pipe, the exhaust port of the main absorption box is connected to the auxiliary absorption box through an air guide pipe, the upper half of the main absorption box is an arc surface structure, the air inlet pipe and the air guide pipe are connected at a position close to the center of the main absorption box, the exhaust port of the auxiliary absorption box is connected to the exhaust pipe; a tail gas absorption unit is arranged in the main absorption box, the tail gas absorption unit is connected to the exhaust port of the auxiliary absorption box, and the tail gas absorption unit is connected to the exhaust port of the auxiliary absorption box. The gas absorption unit includes a central shaft which is laterally rotatably mounted on the axis of the main absorption box, and a motor for controlling the rotation of the central shaft is arranged on the outside of the main absorption box. A plurality of fan-shaped activated carbon absorption blocks are circumferentially arranged on the central shaft, and adjacent activated carbon absorption blocks are closely arranged to form a cylindrical activated carbon group which matches the arc surface above the main absorption box. The bottom of the main absorption box is arranged as a solution cavity, and the activated carbon absorption blocks located below the central shaft can be immersed in the solution in the solution cavity; an activated carbon absorption plate is mounted in the auxiliary absorption box.

[0006] Furthermore, a water-absorbing sponge is placed in the air intake pipe.

[0007] Furthermore, the air inlet pipe, the main absorption box, the air guide pipe, the auxiliary absorption box and the exhaust pipe are connected in sequence through threads.

[0008] Furthermore, a sealing sleeve is movably mounted on the air inlet of the air inlet pipe, and the sealing sleeve can be moved to the connection between the outlet joint of the nitrogen analyzer and the air inlet pipe to seal the connection gap between the two.

[0009] Compared with the prior art, the beneficial effects of the utility model are:

[0010] The utility model optimizes the contact area and adsorption efficiency between the exhaust gas and the activated carbon by arranging a main absorption box, a tail gas absorption unit and an auxiliary absorption box, the arc surface structure of the main absorption box and the cylindrical design of the activated carbon group, and the activated carbon absorption block can rotate into the solution cavity to contact with the chemical solution after adsorbing harmful substances in the exhaust gas, and when the activated carbon absorption block passes through the chemical solution, the harmful substances can be automatically desorbed after chemical reaction, thereby realizing the automatic regeneration and maintenance of the adsorption function of the adsorption material, reducing the replacement frequency of the activated carbon, and reducing the operation and maintenance costs of the equipment; and part of the chemical solvent will remain in the pores of the activated carbon absorption block after regeneration, and when the exhaust gas contacts the activated carbon absorption block, it can directly react with the residual chemical solvent to realize chemical adsorption, and through the mutual cooperation of the activated carbon absorption block and the chemical solvent, the two methods of physical adsorption and chemical adsorption can be combined to improve the efficiency and thoroughness of the exhaust gas treatment. BRIEF DESCRIPTION OF THE DRAWINGS

[0011] Figure 1 It is a three-dimensional structural schematic diagram of the utility model;

[0012] Figure 2 This is a schematic diagram of the internal structure of the main absorption box of the utility model;

[0013] Figure 3 It is a front view cross-sectional structural schematic diagram of the utility model.

[0014] In the figure: 1. nitrogen analyzer outlet connector; 2. air inlet pipe; 3. main absorption box; 4. air guide pipe; 5. auxiliary absorption box; 6. exhaust pipe; 7. tail gas absorption unit; 71. central shaft; 72. activated carbon absorption block; 73. motor; 74. transmission gear; 75. solution chamber; 8. activated carbon absorption plate; 9. sealing sleeve; 10. absorbent sponge. DETAILED DESCRIPTION

[0015] The utility model is further described below in conjunction with the accompanying drawings and embodiments.

[0016] See also Figure 1-3 The utility model provides a technical solution for the tail gas absorption device of the nitrogen determination instrument digestion tube: Example

[0017] according to Figure 1 As shown, a tail gas absorption device for a nitrogen analyzer digestion tube comprises an air inlet pipe 2, a main absorption box 3, an air guide pipe 4, an auxiliary absorption box 5 and an exhaust pipe 6 which are connected in sequence, the air inlet pipe 2 is connected to the air outlet joint 1 of the nitrogen analyzer, the main absorption box 3 is connected to the air outlet end of the air inlet pipe 2, the upper half of the main absorption box 3 is an arc surface structure, the air inlet pipe 2 and the air guide pipe 4 are connected at a position close to the center of the main absorption box 3, and the exhaust port of the main absorption box 3 is connected to the auxiliary absorption box 5 through the air guide pipe 4, and the exhaust port of the auxiliary absorption box 5 is connected to the exhaust pipe 6.

[0018] according to Figure 2 and Figure 3As shown, the main absorption box 3 is provided with an exhaust gas absorption unit 7, and the exhaust gas absorption unit 7 includes a central shaft 71 which is laterally rotatably mounted on the axis of the main absorption box 3. A motor 73 is mounted on the outside of the main absorption box 3 through a motor 73 seat. The output end of the motor 73 and the outer end of the shaft are fixedly mounted with a mutually meshing transmission gear 74. A plurality of fan-shaped activated carbon absorption blocks 72 are circumferentially arranged on the central shaft 71. Adjacent activated carbon absorption blocks 72 are closely arranged to form a cylindrical activated carbon group matching the arc surface above the main absorption box 3. When the motor 73 controls the rotation of the central shaft 71, it can drive the activated carbon group to rotate circumferentially above the main absorption box 3. The bottom of the main absorption box 3 is configured as a solution cavity 75, and a liquid inlet and a liquid discharge port are provided at the position of the solution cavity. An acidic solution is provided in the solution cavity 75. With the central rotating shaft 71 as the dividing line, the upper activated carbon absorption block 72 can rotate in accordance with the arc surface structure above the main absorption box 3, and the air outlet of the air inlet pipe 2 corresponds to the activated carbon absorption block 72 located above, and the activated carbon absorption block 72 located below the central rotating shaft 71 can be immersed in the chemical substances in the solution cavity 75, and the chemical substances can be acid solutions or alkaline solutions. As the central rotating shaft 71 drives the activated carbon group to rotate, each activated carbon adsorption block can pass through the solution cavity 75 and contact with the acidic solution. In the process of absorbing the exhaust gas, the exhaust gas first contacts the upper activated carbon absorption block 72 through the intake pipe 2, and the upper activated carbon absorption block 72 absorbs harmful substances in the exhaust gas. As the activated carbon group rotates in the main absorption box 3, the activated carbon absorption block 72 will rotate to the chemical substance to react after the exhaust gas adsorption. The acid solution or the alkaline solution can react with the adsorbed substance to desorb it from the activated carbon, and the chemical substance is used to desorb the pollutants adsorbed on the activated carbon, so as to realize the automatic regeneration of the adsorption capacity of the activated carbon. Then, the regenerated activated carbon absorption block 72 rotates to the position of the air outlet, so that the activated carbon absorption block 72 corresponding to the air outlet always has a high adsorption capacity, and there is no need to frequently replace the activated carbon, thereby improving the convenience of use; and after the activated carbon absorption block 72 passes through the solution cavity 75, part of the acid solution or the alkaline solution will remain in the pores of the activated carbon absorption block 72. When the harmful substances in the exhaust gas pass through the activated carbon absorption block 72, they can directly react chemically with the small amount of solution remaining in the pores, so as to realize the combination of physical adsorption and chemical adsorption of the exhaust gas, thereby improving the absorption efficiency of the exhaust gas.

[0019] The auxiliary absorption box 5 is provided with an activated carbon absorption plate 8. The exhaust gas treated by the absorption and purification unit can be adsorbed and filtered again by the activated carbon absorption plate 8 before being discharged, so that the small amount of harmful substances remaining in the exhaust gas can be thoroughly adsorbed, thereby improving the effect of exhaust gas treatment.

[0020] A water-absorbing sponge 10 is placed inside the intake pipe 2. The exhaust gas needs to pass through the water-absorbing sponge 10 before entering the main absorption box 3. The water vapor carried in the exhaust gas can be absorbed by the water-absorbing sponge 10, and the water molecules in the exhaust gas can be preliminarily adsorbed. The water-absorbing sponge 10 can be taken out from the intake pipe 2 and replaced.

[0021] Furthermore, the air intake pipe 2, the main absorption box 3, the air guide pipe 4, the auxiliary absorption box 5 and the exhaust pipe 6 are connected in sequence through threads. When the absorbent sponge 10, the activated carbon adsorption block or the activated carbon adsorption plate needs to be replaced or cleaned after long-term use, the corresponding components can be removed through the connection between the pipe bodies to replace the internal adsorption parts.

[0022] When used specifically, the utility model is a nitrogen analyzer digestion tube tail gas absorption device. First, the air inlet pipe 2 is connected to the nitrogen analyzer outlet joint 1, and the motor 73 is controlled to operate. The meshing force of the transmission gear 74 controls the central rotating shaft 71 to drive the activated carbon group to rotate slowly in the main absorption box 3. The harmful tail gas generated by the nitrogen analyzer enters the main absorption box 3 through the air inlet pipe 2 and contacts with the activated carbon absorption block 72 located above. The harmful substances in the tail gas are absorbed by the activated carbon absorption block 72 above, and then the activated carbon absorption block above that absorbs the harmful substances gradually rotates to The activated carbon absorption block 72 is placed below the exhaust gas chamber 2 and immersed in the chemical solution in the solution chamber 75 to react with the chemical solution. The harmful substances adsorbed on the activated carbon absorption block 72 can be desorbed by the chemical solution and desorbed from the activated carbon absorption block 72, so that the activated carbon absorption block 72 can restore its efficient adsorption capacity and rotate to the position of the intake pipe 2 again to adsorb the harmful substances in the exhaust gas. The activated carbon group is driven to rotate continuously by the central rotating shaft 71, so as to achieve efficient absorption of the exhaust gas. The exhaust gas purified and absorbed by the main absorption box 3 enters the auxiliary absorption box 5 through the air guide pipe 4 for secondary adsorption, and is finally discharged from the exhaust pipe 6. Example

[0023] Based on the first embodiment, the same points as the first embodiment will not be repeated here, and the differences are as follows: Figure 1 and Figure 3 As shown, a sealing sleeve 9 is movably mounted at the air inlet of the air inlet pipe 2. After the air inlet pipe 2 is connected to the outlet connector 1 of the nitrogen analyzer, the experimenter can manually push the sealing sleeve 9 to move the sealing sleeve 9 to the connection between the outlet connector 1 of the nitrogen analyzer and the air inlet pipe 2 to seal the connection gap between the two to prevent exhaust gas from leaking from the connection.

[0024] The above description is only a preferred embodiment of the present invention and does not limit the present invention. Any modifications, equivalent substitutions and improvements made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims

1. A nitrogen analyzer digestion pipe tail gas absorption device, comprising an air inlet pipe (2), the air inlet pipe (2) being connected to a nitrogen analyzer outlet joint (1), characterized in that: A main absorption box (3) is connected to the air outlet of the air inlet pipe (2); the exhaust port of the main absorption box (3) is connected to the auxiliary absorption box (5) via an air guide pipe (4); the upper half of the main absorption box (3) is an arc surface structure; the air inlet pipe (2) and the air guide pipe (4) are connected at a position close to the center of the main absorption box (3); the exhaust port of the auxiliary absorption box (5) is connected to an exhaust pipe (6); an exhaust gas absorption unit (7) is arranged in the main absorption box (3); the exhaust gas absorption unit (7) comprises a central rotating shaft (71) which is laterally rotatably sleeved on the axis of the main absorption box (3); A motor (73) for controlling the rotation of a central rotating shaft (71) is arranged outside the main absorption box (3); a plurality of fan-shaped activated carbon absorption blocks (72) are arranged circumferentially on the central rotating shaft (71); adjacent activated carbon absorption blocks (72) are closely arranged to form a cylindrical activated carbon group matching the arc surface above the main absorption box (3); the bottom of the main absorption box (3) is arranged to form a solution cavity (75); the activated carbon absorption blocks (72) located below the central rotating shaft (71) can be immersed in the solution in the solution cavity (75); and an activated carbon absorption plate (8) is mounted inside the auxiliary absorption box (5).

2. The tail gas absorption device for the nitrogen analyzer digestion tube according to claim 1 is characterized in that: A water-absorbing sponge (10) is placed in the air inlet pipe (2).

3. The tail gas absorption device for the digestion tube of a nitrogen analyzer according to claim 1 is characterized in that: The air intake pipe (2), the main absorption box (3), the air guide pipe (4), the auxiliary absorption box (5) and the exhaust pipe (6) are connected in sequence through threads.

4. The tail gas absorption device for the nitrogen analyzer digestion tube according to claim 1 is characterized in that: A sealing sleeve (9) is movably mounted on the air inlet of the air inlet pipe (2), and the sealing sleeve (9) can be moved to the connection between the nitrogen analyzer outlet connector (1) and the air inlet pipe (2) to seal the connection gap between the two.

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