A chloromethane tail gas recovery device

Abstract

The utility model provides a kind of methyl chloride tail gas recovery device, methyl chloride tail gas recovery device includes spray tower, falling film absorption tower, analytical column and methyl chloride storage tank connected in turn by conveying assembly, still be equipped with spherical pressure buffer tank between analytical column and methyl chloride storage tank, the end of import pipeline of spherical pressure buffer tank is obliquely fixed with weir plate, and the oblique angle of weir plate is 45 degrees, etc., the methyl chloride tail gas recovery device provided by the utility model, spherical pressure buffer tank is additionally arranged between analytical column and methyl chloride storage tank, and the end of import pipeline is obliquely fixed with weir plate of 45 degrees angle, when gas enters spherical pressure buffer tank, weir plate can change the flow direction and speed of gas, so that gas is evenly dispersed into spherical pressure buffer tank, avoid gas concentrated impact, effectively reduce the direct impact force of gas to tank body, to some extent, prolong the service life of equipment.

Description

Technical Field

[0001] This utility model relates to the field of chloromethane tail gas recovery, and in particular to a chloromethane tail gas recovery device. Background Technology

[0002] Chloromethane, as an important chemical raw material, has wide applications in many industrial production processes. However, chloromethane tail gas is inevitably generated during its production and use. If this tail gas is directly released into the atmosphere, it will not only waste resources but also cause serious environmental pollution. Therefore, the research and application of chloromethane tail gas recovery devices are of great significance.

[0003] Currently, common chloromethane tail gas recovery devices mainly consist of a spray tower, a falling film absorption tower, a desorption tower, and a chloromethane storage tank, which are connected in sequence via a conveying assembly. The spray tower and falling film absorption tower are mainly used to absorb chloromethane in the tail gas, while the desorption tower is responsible for desorbing the solution that has absorbed chloromethane, separating the chloromethane from the solution, and finally conveying it to the chloromethane storage tank for storage. For example, the existing publication number CN218166485U discloses a chloromethane tail gas treatment and recovery device, including a spray tower, a falling film absorption tower, and a desorption tower. The gas outlet at the top of the spray tower is connected to the gas inlet at the bottom of the falling film absorption tower through a first pipeline, and the liquid outlet at the bottom of the falling film absorption tower is connected to the desorption tower through a second pipeline. The liquid inlet at the middle of the stripping tower and the gas outlet at the top of the stripping tower are connected to a chloromethane storage tank. The liquid outlet at the bottom of the stripping tower is connected to the liquid inlet at the top of the falling film absorption tower via a third pipeline. Multi-stage spray absorption is adopted, which improves the absorption efficiency of substances such as pyridine, methanol, and ammonia. The low-temperature falling film absorption tower is used to absorb chloromethane, which not only has high chloromethane absorption efficiency, but also allows the absorbent to be recycled. This equipment effectively solves the problem of strong odor in the workshop and realizes the resource utilization of chloromethane, enabling chloromethane to meet emission standards, which is environmentally friendly and efficient.

[0004] However, in actual use, the gas flow rate at the outlet of the stripping tower is easily affected by the upstream process. The upstream process is the process link in the chloromethane production process before the recovery unit, including the chloromethane synthesis reaction, raw material pretreatment, and reaction condition control. For example, changes in the load of the upstream reactor or temperature fluctuations—that is, changes in the amount of raw materials input or the reaction intensity participating in the chloromethane synthesis reaction in the reactor, or temperature fluctuations—will cause a sudden change in the gas flow rate at the outlet of the stripping tower. When the discharge valve on the surface of the stripping tower suddenly opens, a large amount of gas rushes out instantly. If it directly rushes into the downstream chloromethane storage tank, the pressure inside the storage tank will drop sharply. A sudden increase in pressure can easily trigger the safety valve of the storage tank, or even cause deformation of the tank equipment, posing a serious safety hazard to production. At the same time, fluctuations in tank pressure will have a reverse effect on the desorption tower. Changes in tank pressure will alter the pressure conditions at the top of the desorption tower, thereby disrupting the originally stable gas-liquid balance within the tower. Once the gas-liquid balance is broken, the mass and heat transfer efficiency within the desorption tower will decrease significantly, causing the desorption process to fail. The desorption efficiency of chloromethane will be significantly reduced, which not only affects the amount of chloromethane recovered and increases production costs, but also negatively impacts the stability and reliability of the entire recovery unit, causing inconvenience in actual use.

[0005] Therefore, it is necessary to provide a new chloromethane tail gas recovery device to solve the above-mentioned technical problems. Utility Model Content

[0006] To solve the above-mentioned technical problems, this utility model provides a chloromethane tail gas recovery device.

[0007] The chloromethane tail gas recovery device provided by this utility model includes: a spray tower, a falling film absorption tower, a desorption tower, and a chloromethane storage tank connected in sequence by a conveying component. A spherical pressure buffer tank is also provided between the desorption tower and the chloromethane storage tank. A weir plate is fixed at the end of the inlet pipeline of the spherical pressure buffer tank at an inclination angle of 45 degrees. A first partition, a second partition, and a third partition are fixed in sequence on the inner side wall of the spherical pressure buffer tank. A front chamber, a middle chamber, and a rear chamber are formed in sequence between the first partition, the second partition, the third partition and the spherical pressure buffer tank. The bottom of the first partition, the second partition, and the third partition all have arc-shaped ends.

[0008] Preferably, the two ends of the spherical pressure buffer tank are fixedly connected to the gas outlet at the top of the analytical tower and the gas inlet at the top of the chloromethane storage tank respectively via connecting pipes. The surface of the spherical pressure buffer tank is also provided with a safety valve and a pressure gauge, with the pressure gauge located on one side of the safety valve.

[0009] Preferably, the conveying assembly includes a first pipeline, a second pipeline, and a third pipeline. The gas outlet at the top of the spray tower is connected to the gas inlet at the bottom of the falling film absorber via the first pipeline. The liquid outlet at the bottom of the falling film absorber is connected to the liquid inlet at the middle of the desorption tower via the second pipeline. A second pump is installed on the second pipeline. The gas outlet at the top of the desorption tower is connected to the inlet pipeline of the spherical pressure buffer tank. The liquid outlet at the bottom of the desorption tower is connected to the liquid inlet at the top of the falling film absorber via the third pipeline. A third pump is installed on the third pipeline. A reboiler is connected to the bottom of the desorption tower.

[0010] Preferably, a spraying assembly is fixed to the surface of the spray tower;

[0011] The spray assembly includes a main spray pipe, a first spray branch pipe, and a second spray branch pipe. The main spray pipe is fixed to the outside of the spray tower, and a first pump body is fixed to the surface of the main spray pipe. One end of each of the first and second spray branch pipes passes through the surface of the spray tower and is fixedly connected to the surface of the spray tower. Multiple first spiral nozzles and multiple second spiral nozzles are respectively installed on the surface of the first and second spray branch pipes. A first packing layer and a second packing layer are provided on the spray tower. The first packing layer is located below the first spray branch pipe and above the second spray branch pipe, and the second packing layer is located below the second spray branch pipe. An exhaust gas inlet is provided at the bottom of the spray tower, and a gas distributor is also provided at the bottom of the spray tower.

[0012] Preferably, the inner wall of the falling film absorption tower is covered with an electric heating cable.

[0013] Preferably, a wire mesh demister is fixed to the top wall of the analytical tower, a partition plate is vertically arranged on the inner side wall of the analytical tower, and multiple tower plates are inclinedly fixed on both sides of the partition plate. One end of the multiple tower plates is fixed at equal intervals from top to bottom on the inner side wall of the analytical tower. The surfaces of the multiple tower plates are corrugated, and multiple inclined holes are opened on the surfaces of the multiple tower plates.

[0014] Preferably, the gas outlet at the top of the falling film absorber is connected to a chimney.

[0015] Compared with related technologies, the chloromethane tail gas recovery device provided by this utility model has the following beneficial effects:

[0016] 1. In the chloromethane tail gas recovery unit, the gas flow rate at the outlet of the stripping tower is easily affected by the upstream process and may change abruptly. When the discharge valve of the stripping tower suddenly opens and a large amount of gas rushes out instantly, in traditional units, the gas directly rushes into the chloromethane storage tank, causing the pressure inside the storage tank to rise sharply. This can easily trigger the safety valve to trip or even cause deformation of the storage tank equipment, posing a serious safety hazard to production. This unit adds a spherical pressure buffer tank between the stripping tower and the chloromethane storage tank, and the inlet pipeline is fixed with a weir plate at a 45-degree angle. When the gas enters the spherical pressure buffer tank, the weir plate can change the flow direction and speed of the gas, so that the gas enters the spherical pressure buffer tank evenly and disperses, avoiding concentrated gas impact and effectively reducing the direct impact force of the gas on the tank. At the same time, the spherical structure of the buffer tank has high strength and stability and can withstand certain pressure changes, further ensuring the safe operation of the equipment when pressure fluctuates, reducing equipment damage and safety accidents caused by sudden pressure changes, and extending the service life of the equipment.

[0017] 2. The pressure buffer tank of this device is spherical, and a first baffle, a second baffle, and a third baffle are fixed sequentially on its inner wall, dividing the interior of the buffer tank into a front compartment, a middle compartment, and a rear compartment. This multi-compartment design allows gas to enter from the front compartment and pass through the middle and rear compartments before entering the chloromethane storage tank. In each compartment, the gas pressure and flow rate are adjusted and buffered to a certain extent. The arc-shaped design at the bottom of the first, second, and third baffles not only reduces resistance to gas flow but also guides the gas to form a relatively stable flow at the bottom of the compartment, avoiding eddies and turbulence. This further optimizes the gas flow state, making the pressure buffering effect more significant and effectively stabilizing the pressure inside the storage tank. To a certain extent, this ensures that the device operates in a stable gas pressure environment. Furthermore, the spherical shape of the pressure buffer tank reduces pressure fluctuations in the storage tank, solving the problem that pressure fluctuations in the storage tank can negatively impact the desorption tower, leading to a significant reduction in the desorption efficiency of chloromethane. Attached Figure Description

[0018] Figure 1 A schematic diagram of the chloromethane tail gas recovery device provided by this utility model;

[0019] Figure 2 This is a schematic diagram of the structure of the spray tower of this utility model;

[0020] Figure 3 This is a schematic diagram of the falling film absorption tower of this utility model;

[0021] Figure 4 This is a schematic diagram of the analytical tower of this utility model;

[0022] Figure 5This is a schematic diagram of the structure of the buffer tank of this utility model.

[0023] Numbered in the diagram: 1. Spray tower; 11. Spray main pipe; 12. First pump body; 121. First pipeline; 13. First spray branch pipe; 131. First spiral nozzle; 14. First packing layer; 15. Second packing layer; 16. Second spray branch pipe; 161. Second spiral nozzle; 17. Gas distributor; 2. Falling film absorption tower; 21. Electric heating tape; 22. Second pipeline; 23. Second pump body; 3. Chimney; 4. 41. Desorption tower; 42. Wire mesh demister; 43. Divider plate; 44. Tray; 5. Slanted hole; 6. Spherical pressure buffer tank; 7. Safety valve; 8. Pressure gauge; 9. Weir plate; 10. First partition plate; 11. Second partition plate; 12. Third partition plate; 13. Arc-shaped end; 14. Front compartment; 15. Middle compartment; 16. Rear compartment; 17. Chloromethane storage tank; 28. Reboiler; 39. Third pipeline; 20. Third pump body. Detailed Implementation

[0024] The present invention will be further described below with reference to the accompanying drawings and embodiments.

[0025] Please refer to the following: Figures 1 to 5 ,in, Figure 1 A schematic diagram of the chloromethane tail gas recovery device provided by this utility model; Figure 2 This is a schematic diagram of the structure of the spray tower of this utility model; Figure 3 This is a schematic diagram of the falling film absorption tower of this utility model; Figure 4 This is a schematic diagram of the analytical tower of this utility model; Figure 5 This is a schematic diagram of the structure of the buffer tank of this utility model.

[0026] In some embodiments, such as Figures 1 to 5 As shown, the system includes a spray tower 1, a falling film absorption tower 2, a desorption tower 4, and a chloromethane storage tank 6, which are connected in sequence via a conveying assembly. A spherical pressure buffer tank 5 is also provided between the desorption tower 4 and the chloromethane storage tank 6. A weir plate 53 is fixed at an inclined angle at the end of the inlet pipeline of the spherical pressure buffer tank 5. The weir plate 53 has an inclination angle of 45 degrees. A first partition plate 54, a second partition plate 55, and a third partition plate 56 are fixed in sequence on the inner side wall of the spherical pressure buffer tank 5. A front chamber 58, a middle chamber 581, and a rear chamber 582 are formed between the first partition plate 54, the second partition plate 55, the third partition plate 56 and the spherical pressure buffer tank 5. An arc-shaped end 57 is formed at the bottom of the first partition plate 54, the second partition plate 55, and the third partition plate 56.

[0027] Specifically, in the chloromethane tail gas recovery unit, the gas flow rate at the outlet of the stripping tower 4 is easily affected by the upstream process and can change abruptly. When the discharge valve of the stripping tower 4 suddenly opens and a large amount of gas rushes out instantly, in traditional units, the gas directly rushes into the chloromethane storage tank 6, causing a sharp rise in pressure inside the tank. This can easily trigger the safety valve to trip or even cause deformation of the storage tank, posing a serious safety hazard to production. This unit adds a spherical pressure buffer tank 5 between the stripping tower 4 and the chloromethane storage tank 6, and the inlet pipeline is fixed with a weir plate 53 at a 45-degree angle. When the gas enters the spherical pressure buffer tank 5, the weir plate 53 can change the flow direction and speed of the gas, allowing the gas to enter the spherical pressure buffer tank 5 evenly and dispersedly. The weir plate 53 with an angled angle allows the fluid to change its flow direction at a relatively gentle angle, rather than directly impacting the bottom or interior of the tank vertically. According to the principles of fluid mechanics, oblique impact produces less impact force than vertical impact. This helps reduce wear and damage to the inner wall and internal components of the spherical pressure buffer tank 5, extends the service life of the equipment, and avoids concentrated gas impact, effectively reducing the direct impact force of gas on the spherical pressure buffer tank 5. At the same time, the spherical structure of the buffer tank has high strength and stability, and can withstand certain pressure changes, further ensuring the safe operation of the equipment during pressure fluctuations, reducing equipment damage and safety accidents caused by sudden pressure changes, and extending the service life of the equipment.

[0028] Furthermore, the pressure buffer tank of this device is spherical, and a first baffle 54, a second baffle 55, and a third baffle 56 are fixed sequentially on its inner wall. The interior of the spherical buffer tank 5 is sequentially divided into a front compartment 58, a middle compartment 581, and a rear compartment 582. This multi-compartment structure design allows gas to enter from the front compartment 58 and pass through the middle compartment 581 and the rear compartment 582 before entering the chloromethane storage tank 6. In each compartment, the gas pressure and flow rate are adjusted and buffered to a certain extent. The arc-shaped ends 57 at the bottom of the first baffle 54, the second baffle 55, and the third baffle 56 not only reduce the resistance to gas flow but also guide the gas to form a relatively stable flow at the bottom of the compartment, avoiding eddies and turbulence at the bottom. This further optimizes the gas flow state, making the pressure buffering effect more significant and more effectively stabilizing the pressure inside the spherical pressure buffer tank. To a certain extent, this ensures that the device operates in a stable gas pressure environment. At the same time, the spherical shape of the pressure buffer tank 5 also reduces the pressure fluctuation of the storage tank to a certain extent.

[0029] In some embodiments, reference is made to Figure 1 , Figure 3 , Figure 4 as well as Figure 5As shown, the two ends of the spherical pressure buffer tank 5 are fixedly connected to the gas outlet at the top of the analytical tower 4 and the gas inlet at the top of the chloromethane storage tank 6 respectively through connecting pipes. The surface of the spherical pressure buffer tank 5 is also equipped with a safety valve 51 and a pressure gauge 52, with the pressure gauge 52 located on one side of the safety valve 51.

[0030] Among them, pressure gauge 52 is used to monitor the pressure value inside spherical pressure buffer tank 5 in real time, providing operators with intuitive pressure data;

[0031] Safety valve 51 serves as a safety protection device. When the pressure inside the spherical pressure buffer tank 5 exceeds the set safety value, it automatically opens to release pressure, preventing the spherical pressure buffer tank 5 from becoming dangerous due to excessive pressure.

[0032] The conveying assembly includes a first pipeline 121, a second pipeline 22, and a third pipeline 8. The gas outlet at the top of the spray tower 1 is connected to the gas inlet at the bottom of the falling film absorption tower 2 through the first pipeline 121, realizing the conveying of tail gas from the spray tower 1 to the falling film absorption tower 2. The liquid outlet at the bottom of the falling film absorption tower 2 is connected to the liquid inlet at the middle of the desorption tower 4 through the second pipeline 22. A second pump body 23 is installed on the second pipeline 22, which provides power for liquid conveying, ensuring that the solution that has absorbed chloromethane can smoothly enter the desorption tower 4 for desorption. The gas outlet at the top of the desorption tower 4 is connected to the inlet pipeline of the spherical pressure buffer tank 5. The liquid outlet at the bottom of the desorption tower 4 is connected to the liquid inlet at the top of the falling film absorption tower 2 through the third pipeline 8. A third pump body 81 is installed on the third pipeline 8, which conveys the desorbed solution at the bottom of the desorption tower 4 back to the falling film absorption tower 2, realizing the recycling of the solution.

[0033] The gas outlet at the top of the falling film absorption tower 2 is connected to a chimney 3, which is used to discharge a small amount of tail gas that still does not meet the recovery standards after absorption and treatment, ensuring that the tail gas meets the emission standards and reducing environmental pollution.

[0034] The bottom of the stripping column 4 is connected to a reboiler 7, which provides heat to the stripping column 4, allowing the solution that has absorbed chloromethane to be stripped under heating conditions, thus separating the chloromethane from the solution.

[0035] Specifically, the chloromethane tail gas first enters spray tower 1. Inside spray tower 1, the chloromethane tail gas comes into contact with the spray liquid, and some of the chloromethane and other impurities are absorbed by the spray liquid. The preliminarily purified gas enters falling film absorption tower 2 from the gas outlet at the top of the spray tower through the first pipeline 121. In falling film absorption tower 2, the gas descends along the tower wall in a film-like manner, flowing counter-currently with the absorbent sprayed down from the top of the tower, further absorbing the chloromethane in the gas. The solution that has absorbed the chloromethane exits from the liquid outlet at the bottom of the falling film absorption tower through the second pipeline 22 and the second pump. The solution 23 is transported to the liquid inlet at the middle of the stripping tower 4. Under the heat provided by the reboiler 7, chloromethane is stripped from the solution and discharged as gas from the gas outlet at the top of the stripping tower 4. After being buffered and stabilized by the spherical pressure buffer tank 5, it enters the chloromethane storage tank 6 for storage. The solution stripped at the bottom of the stripping tower 4 is transported back to the liquid inlet at the top of the falling film absorption tower 2 through the third pipeline 8 and the third pump 81, realizing the recycling of the solution. After being treated by the spray tower 1 and the falling film absorption tower 2, the gas is discharged into the atmosphere through the chimney 3.

[0036] In some embodiments, reference is made to Figure 1 as well as Figure 2 As shown, a spraying assembly is fixed to the surface of the spray tower 1;

[0037] The spray assembly includes a main spray pipe 11, a first spray branch pipe 13, and a second spray branch pipe 16. The main spray pipe 11 is fixed to the outside of the spray tower 1, and a first pump body 12 is fixed to the surface of the main spray pipe 11. One end of the first spray branch pipe 13 and the second spray branch pipe 16 passes through the surface of the spray tower 1 and is fixedly connected to the surface of the spray tower 1. Multiple first spiral nozzles 131 and multiple second spiral nozzles 161 are respectively installed on the surface of the first spray branch pipe 13 and the second spray branch pipe 16. A first packing layer 14 and a second packing layer 15 are provided on the spray tower 1. The first packing layer 14 is located below the first spray branch pipe 13 and above the second spray branch pipe 16. The second packing layer 15 is located below the second spray branch pipe 16. A tail gas inlet is provided at the bottom of the spray tower 1. A gas distributor 17 is also provided at the bottom of the spray tower 1.

[0038] Specifically, the chloromethane tail gas enters from the tail gas inlet at the bottom of the spray tower 1. After being evenly distributed by the gas distributor 17, it flows upward with a relatively uniform flow rate and distribution. The first pump body 12 delivers the spray liquid to the spray main pipe 11, and then enters the first spray branch pipe 13 and the second spray branch pipe 16 respectively. The first spiral nozzle 131 on the first spray branch pipe 13 sprays the spray liquid into fine droplets, which make initial contact and absorption with the upward flowing tail gas above the first packing layer 14. Some of the chloromethane and other impurities in the tail gas are absorbed by the spray liquid. The absorbed tail gas continues to flow upward, and the second spiral nozzle 161 on the second spray branch pipe 16 sprays the spray liquid into droplets again, which make secondary contact and absorption with the tail gas after the first-stage spray absorption above the second packing layer 15. After two stages of spray absorption, chloromethane and other impurities in the exhaust gas are further removed. The purified gas is discharged from the top of the spray tower and enters the subsequent treatment stage. The spray liquid that has absorbed chloromethane and other impurities is collected at the bottom of spray tower 1 and can be further treated or recycled according to the actual situation to reduce production costs and reduce resource waste.

[0039] Furthermore, the design employs a two-stage spray system and a double-layer packing layer, which increases the number of contacts and the contact area between the exhaust gas and the spray liquid. The fine droplets formed by the spiral nozzle can mix more thoroughly with the exhaust gas, making it easier for chloromethane and other impurities to be absorbed by the spray liquid. This significantly improves the absorption efficiency of chloromethane in the exhaust gas and reduces the emission loss of chloromethane.

[0040] In some embodiments, reference is made to Figure 1 as well as Figure 3 As shown, the inner wall of the falling film absorption tower 2 is covered with an electric heating cable 21.

[0041] Specifically, after the electric heating tape 21 is powered on, its internal heating element generates heat. This heat is transferred from the electric heating tape 4 to the inner wall of the falling film absorption tower 2, which is in contact with it, through heat conduction. After absorbing the heat, the inner wall of the tower rises in temperature, and then transfers the heat to the liquid and gas medium inside the tower. During the operation of the falling film absorption tower 2, the absorption process needs to be carried out under certain temperature conditions to obtain a better absorption effect. The function of the electric heating tape 21 is to maintain the temperature of the inner wall of the tower and the medium inside the tower within a set suitable range. For example, when the ambient temperature is low, the viscosity of the liquid inside the tower will increase due to the temperature drop, affecting the formation of a uniform liquid film on the inner wall of the tower, thereby reducing the absorption efficiency. At the same time, low temperature will also cause the rate of some absorption reactions to slow down. The electric heating tape 21 prevents this from happening by continuously supplying heat, ensuring that the absorption process can proceed in an orderly manner. In some absorption processes, the materials being processed are prone to crystallization or solidification at low temperatures. If these materials crystallize or solidify inside the falling film absorption tower 2, it will not only block the channels inside the tower and affect the normal flow of materials, but also damage the internal components of the tower and shorten the service life of the equipment. The heat provided by the electric heating tape 4 can effectively prevent the material from crystallizing or solidifying due to excessively low temperature, ensuring the fluidity of the material and maintaining the normal operation of the system.

[0042] In some embodiments, reference is made to Figure 1 as well as Figure 4 As shown, a wire mesh demister 41 is fixed to the top wall of the analytical tower 4, and a partition plate 42 is vertically arranged on the inner side wall of the analytical tower 4. Multiple trays 43 are fixed at an incline on both sides of the partition plate 42. One end of the multiple trays 43 is fixed at equal intervals from top to bottom on the inner side wall of the analytical tower 4. The surfaces of the multiple trays 43 are corrugated, and multiple inclined holes 44 are opened on the surfaces of the multiple trays 43.

[0043] Among them, a partition plate 42 is vertically arranged on the inner wall of the analytical tower 4. The partition plate 42 divides the internal space of the analytical tower 4 to a certain extent, affecting the gas-liquid flow path.

[0044] Among them, the preferred model of the wire mesh demister 41 is YX2205;

[0045] Specifically, the design of the multi-stage inclined tray 43 increases the gas-liquid contact area and contact time. Combined with the corrugated surface and inclined holes 44, the gas-liquid mass transfer process is more complete, which can more effectively realize the separation of substances and improve the purity and recovery rate of the product.

[0046] Furthermore, the wire mesh demister 41 at the top wall of the analytical tower 4 can effectively remove mist droplets entrained in the gas, reduce liquid phase entrainment in the gas, and make the discharged gas drier and purer, meeting the gas quality requirements of subsequent processes, while also reducing material loss.

[0047] The circuits and controls involved in this utility model are all existing technologies, and will not be described in detail here.

[0048] All standard parts used in this utility model can be purchased from the market, and irregular parts can be customized according to the description and drawings. The specific connection methods of each part adopt conventional methods such as bolts, rivets, and welding that are mature in the prior art. The machinery, parts and equipment adopt conventional models in the prior art. In addition, the circuit connection adopts conventional connection methods in the prior art, which will not be described in detail here. The contents not described in detail in this specification belong to the prior art known to those skilled in the art.

[0049] The above description is merely an embodiment of this utility model and does not limit the patent scope of this utility model. Any equivalent structural or procedural transformations made based on the content of this utility model specification and drawings, or direct or indirect applications in other related technical fields, are similarly included within the patent protection scope of this utility model.

Claims

1. A chloromethane tail gas recovery device, comprising a spray tower (1), a falling film absorption tower (2), a stripping tower (4), and a chloromethane storage tank (6) connected in sequence via a conveying assembly, characterized in that, A spherical pressure buffer tank (5) is also provided between the analytical tower (4) and the chloromethane storage tank (6). A weir plate (53) is fixed at the end of the inlet pipeline of the spherical pressure buffer tank (5) at an inclination angle of 45 degrees. A first partition plate (54), a second partition plate (55), and a third partition plate (56) are fixed sequentially on the inner side wall of the spherical pressure buffer tank (5). A front compartment (58), a middle compartment (581), and a rear compartment (582) are formed sequentially between the first partition plate (54), the second partition plate (55), the third partition plate (56), and the spherical pressure buffer tank (5). An arc-shaped end (57) is formed at the bottom of the first partition plate (54), the second partition plate (55), and the third partition plate (56).

2. The chloromethane tail gas recovery device according to claim 1, characterized in that, The two ends of the spherical pressure buffer tank (5) are fixedly connected to the gas outlet at the top of the analytical tower (4) and the gas inlet at the top of the chloromethane storage tank (6) respectively through connecting pipes. The surface of the spherical pressure buffer tank (5) is also provided with a safety valve (51) and a pressure gauge (52), with the pressure gauge (52) located on one side of the safety valve (51).

3. The chloromethane tail gas recovery device according to claim 2, characterized in that, The conveying assembly includes a first pipeline (121), a second pipeline (22), and a third pipeline (8). The gas outlet at the top of the spray tower (1) is connected to the gas inlet at the bottom of the falling film absorption tower (2) through the first pipeline (121). The liquid outlet at the bottom of the falling film absorption tower (2) is connected to the liquid inlet at the middle of the desorption tower (4) through the second pipeline (22). A second pump body (23) is installed on the second pipeline (22). The gas outlet at the top of the desorption tower (4) is connected to the inlet pipeline of the spherical pressure buffer tank (5). The liquid outlet at the bottom of the desorption tower (4) is connected to the liquid inlet at the top of the falling film absorption tower (2) through the third pipeline (8). A third pump body (81) is installed on the third pipeline (8).

4. The chloromethane tail gas recovery device according to claim 3, characterized in that, The surface of the spray tower (1) is fixed with spray components; The spray assembly includes a main spray pipe (11), a first spray branch pipe (13), and a second spray branch pipe (16). The main spray pipe (11) is fixed to the outside of the spray tower (1), and a first pump body (12) is fixed to the surface of the main spray pipe (11). One end of the first spray branch pipe (13) and the second spray branch pipe (16) both pass through the surface of the spray tower (1) and are fixedly connected to the surface of the spray tower (1). A plurality of first screws are respectively installed on the surface of the first spray branch pipe (13) and the second spray branch pipe (16). The spray tower (1) is provided with a swirl nozzle (131) and a plurality of second spiral nozzles (161). A first packing layer (14) and a second packing layer (15) are provided on the spray tower (1). The first packing layer (14) is located below the first spray branch pipe (13) and above the second spray branch pipe (16). The second packing layer (15) is located below the second spray branch pipe (16). The bottom of the spray tower (1) is provided with a tail gas inlet. The bottom of the spray tower (1) is also provided with a gas distributor (17).

5. The chloromethane tail gas recovery device according to claim 4, characterized in that, The inner wall of the falling film absorption tower (2) is covered with an electric heating cable (21).

6. The chloromethane tail gas recovery device according to claim 5, characterized in that, The top wall of the analysis tower (4) is fixed with a wire mesh demister (41). A partition plate (42) is vertically arranged on the inner side wall of the analysis tower (4). Multiple tower plates (43) are fixed at an incline on both sides of the partition plate (42). One end of the multiple tower plates (43) is fixed at equal intervals from top to bottom on the inner side wall of the analysis tower (4). The surfaces of the multiple tower plates (43) are corrugated, and multiple inclined holes (44) are opened on the surfaces of the multiple tower plates (43).

7. The chloromethane tail gas recovery device according to claim 6, characterized in that, The gas outlet at the top of the falling film absorption tower (2) is connected to a chimney (3).

8. The chloromethane tail gas recovery device according to claim 7, characterized in that, The bottom of the analytical column (4) is connected to a reboiler (7).

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