A combined tail gas purification device in a sulfonation production process

Abstract

The utility model relates to tail gas purification technical field especially relates to a kind of combined tail gas purification device in sulfonated production process, comprising: sulfonated reaction mechanism, including to carry out sulfonated reaction to export reaction product and initial tail gas respectively with sulfonated reactor, with the gas-liquid separator that the reaction product and initial tail gas are separated to the sulfonated reactor connection;Tail gas treatment purification mechanism, including with the gas-liquid separator connection to collect liquid particulate matter and solid particulate in initial tail gas to export first tail gas with the sedimentation separator that the initial tail gas is connected with the gas-liquid separator, to the sulfurized gas in first tail gas is absorbed to export secondary tail gas with the concentrated sulfuric acid absorption tower that first conveying pipeline is connected with the sedimentation separator and with the concentrated sulfuric acid absorption tower connection to carry out calcium-based sulfur fixation to export target tail gas with the calcium absorption tower of second conveying pipeline to the secondary tail gas;The utility model improves the effectiveness of tail gas treatment.

Description

Technical Field

[0001] This utility model relates to the field of exhaust gas purification technology, and in particular to a combined exhaust gas purification device in the sulfonation production process. Background Technology

[0002] With the development of daily chemical products and tertiary oil recovery technology, the use of high-molecular-weight substances with molecular weights of 280-550, such as heavy alkylbenzenes, petroleum distillates, and high-carbon-chain α-olefins, as sulfonation raw materials is increasing. Due to their high molecular weight and viscosity, these high-molecular-weight raw materials often involve an excess of sulfur trioxide during the sulfonation process. The gas-liquid molar ratio between gaseous sulfur trioxide and liquid raw materials is generally between 1.05:1 and 2.5:1. Excess sulfur trioxide from the sulfonation reaction enters the tail gas treatment system along with the sulfonated exhaust gas. The excessive sulfur trioxide in the exhaust gas increases the load on the electrostatic precipitator and alkaline scrubbing tower, easily causing the electrostatic precipitator to overload and automatically shut down, preventing the tail gas treatment system from operating normally. This results in exhaust gas emissions exceeding emission standards. Furthermore, even when the electrostatic precipitator and alkaline scrubbing tower are operating normally, the purification of the sulfonated exhaust gas is incomplete, leaving residual acidic gases containing sulfur trioxide, which pollute the surrounding environment.

[0003] Chinese Patent Publication No. CN117861321A discloses a tail gas purification system and process based on the reuse of sulfonation tail gas. The system includes a sulfonator, a gas-liquid separator, a cyclone separator, an electrostatic demister, a sulfonation process fan, a settling separator, a sulfur combustion furnace, a conversion tower, an SO3 cooler, and an SO3 filter, all connected by pipelines. The outlet of the electrostatic demister is connected to the inlet of the sulfonation process fan, which is also connected to an oxygen supply port and a purification liquid inlet. The SO3 filter is connected to the sulfonator. Therefore, the tail gas purification system and process based on the reuse of sulfonation tail gas have several drawbacks. The distance between the settling separator and the settling filter may cause particulate matter to enter other pipelines, potentially causing blockages. Furthermore, the tail gas in the calcium absorption tower may carry away the resulting mist as it passes through the spray area, leading to subsequent pollution. Utility Model Content

[0004] Therefore, this utility model provides a combined tail gas purification device in the sulfonation production process to overcome the problems in the prior art where the distance between the settling separator and the collection filter may cause particulate matter to enter other pipelines and cause blockages, and the tail gas in the calcium absorption tower may easily carry the mist formed when passing through the spray area, thus causing subsequent pollution.

[0005] To achieve the above objectives, this utility model provides a combined tail gas purification device for the sulfonation production process, comprising: The sulfonation reaction apparatus includes a sulfonation reactor for carrying out a sulfonation reaction to output reaction products and initial tail gas respectively, and a gas-liquid separator connected to the sulfonation reactor for separating the reaction products and initial tail gas. The exhaust gas treatment and purification mechanism, connected to the sulfonation reaction mechanism, includes a settling separator connected to the gas-liquid separator for collecting liquid and solid particles in the initial exhaust gas to output the first exhaust gas; a concentrated sulfuric acid absorption tower connected to the settling separator via a first conveying pipe for absorbing sulfided gases in the first exhaust gas to output the second-stage exhaust gas; and a calcium absorption tower connected to the concentrated sulfuric acid absorption tower via a second conveying pipe for calcium-based sulfur fixation of the second-stage exhaust gas to output the target exhaust gas; wherein... The sedimentation separator includes a trapping filter and a cleaning spray head disposed above the trapping filter for cleaning the trapping filter; the calcium absorption tower is equipped with a spray assembly for spraying calcium absorption liquid onto the secondary exhaust gas.

[0006] Furthermore, the sulfonation reaction mechanism also includes a sulfur trioxide delivery pipe connected to the sulfonation reactor for delivering gaseous sulfur trioxide into the sulfonation reactor.

[0007] Furthermore, the vertical distance between the cleaning spray head and the trapping filter is greater than the maximum vertical movement distance of the cleaning liquid when it is atomized into a preset particle size range.

[0008] Furthermore, the upper outlet and lower inlet of the trapping filter are respectively equipped with a first pressure sensor for detecting the first gas pressure of the first exhaust gas after passing through the trapping filter and a second pressure sensor for detecting the second gas pressure of the sedimentation separator space below the trapping filter, wherein, The cleaning spray head responds when the difference between the first air pressure and the second air pressure is greater than a preset difference.

[0009] Furthermore, a third conveying pipeline for conveying gaseous sulfur trioxide to the concentrated sulfuric acid absorption tower and a control valve for controlling the gas flow rate of gaseous sulfur trioxide in the third conveying pipeline are provided between the concentrated sulfuric acid absorption tower and the sulfur trioxide conveying pipeline.

[0010] Furthermore, the spray assembly includes a spray group arranged from top to bottom inside the calcium absorption tower for spraying calcium-based hand sanitizer onto the secondary exhaust gas, wherein, A single spray unit includes a mounting rod and several absorbent spray heads evenly spaced on the mounting rod.

[0011] Furthermore, the calcium absorption tower is also equipped with a recovery tank for storing diluted calcium absorption solution.

[0012] Furthermore, the closest straight-line distance between the lowest spray group and the recovery tank is less than the straight-line distance between the uppermost spray group and the tail gas outlet of the calcium absorption tower.

[0013] Furthermore, the lowest spray group is located above the air inlet of the calcium absorption tower.

[0014] Furthermore, a circulation pump for circulating the calcium absorption solution is provided between the recycling tank and the spray assembly.

[0015] Compared with the prior art, the beneficial effects of this utility model are as follows: By setting a settling separator, a concentrated sulfuric acid absorption tower, and a calcium absorption tower after the gas-liquid separator, and by using a trapping filter in the settling separator, the impact of liquid and solid particles carried in the initial tail gas on the conveying efficiency of the subsequent conveying pipeline is reduced. Furthermore, by using a spray assembly in the calcium absorption tower, several spray groups in the spray assembly perform calcium-based sulfur fixation on the secondary tail gas, resulting in more thorough contact between the calcium absorption liquid and the secondary tail gas, thereby improving the accuracy of calcium absorption.

[0016] Furthermore, by setting the vertical distance between the cleaning spray head and the trapping filter to be greater than the maximum vertical movement distance of the cleaning liquid when it is atomized to a preset particle size range, this invention reduces the effective contact area and contact amount between the cleaning liquid and the polymer material attached to the surface of the filter port in the trapping filter due to changes in the spray position of the cleaning liquid caused by the cleaning spray head being too close to the trapping filter or wear and tear of the cleaning liquid spray head, thereby improving the accuracy of particle capture.

[0017] Furthermore, this invention addresses the issue by ensuring that the shortest straight-line distance between the lowest spray group and the recovery tank is less than the straight-line distance between the uppermost spray group and the tail gas outlet of the calcium absorption tower. When the droplets generated by the lower spray layer are too small, or the tail gas flow rate is too fast, some fine droplets may be carried out of the calcium absorption tower by the airflow, forming a mist. These mists may contain incompletely reacted calcium absorbent or some reaction products. Therefore, by ensuring that the shortest straight-line distance between the lowest spray group and the recovery tank is less than the straight-line distance between the uppermost spray group and the tail gas outlet of the calcium absorption tower, the space between the spray layer and the liquid surface of the recovery tank is reduced. This allows the airflow to impact the liquid surface of the recovery tank before accelerating these droplets to their maximum speed, thus actively removing the mist. Attached Figure Description

[0018] Figure 1 This is a schematic diagram of the overall structure of the combined tail gas purification device in the sulfonation production process according to an embodiment of the present utility model. Figure descriptions: 1-Gas-liquid separator, 2-Sulfonation reactor, 3-Cleaning spray head, 4-Sulfur trioxide conveying pipeline, 5-First conveying pipeline, 6-Concentrated sulfuric acid absorption tower, 7-Calcium absorption tower, 8-Absorbent spray head, 9-Circulating pump, 10-Recovery tank, 11-Second conveying pipeline, 12-Collection filter, 13-Sedimentation separator, 14-Control valve, 15-Third conveying pipeline. Detailed Implementation

[0019] To make the objectives and advantages of this utility model clearer, the utility model will be further described below with reference to the embodiments; it should be understood that the specific embodiments described herein are only for explaining this utility model and are not intended to limit this utility model.

[0020] Preferred embodiments of the present invention will now be described with reference to the accompanying drawings. Those skilled in the art should understand that these embodiments are merely illustrative of the technical principles of the present invention and are not intended to limit the scope of protection of the present invention.

[0021] It should be noted that in the description of this utility model, the terms "upper", "lower", "left", "right", "inner", "outer", etc., indicating the direction or positional relationship are based on the direction or positional relationship shown in the drawings. This is only for the convenience of description and does not indicate or imply that the device or element must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, it should not be construed as a limitation of this utility model.

[0022] Furthermore, it should be noted that, in the description of this utility model, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "joining" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model according to the specific circumstances.

[0023] Please see Figure 1 The diagram shown is an overall structural schematic of the combined tail gas purification device in the sulfonation production process according to an embodiment of this utility model; the combined tail gas purification device in the sulfonation production process of this utility model includes: The sulfonation reaction apparatus includes a sulfonation reactor 2 for carrying out a sulfonation reaction to output reaction products and initial tail gas respectively, and a gas-liquid separator 1 connected to the sulfonation reactor 2 for separating the reaction products and initial tail gas. The exhaust gas treatment and purification mechanism, connected to the sulfonation reaction mechanism, includes a settling separator 13 connected to the gas-liquid separator 1 for collecting liquid and solid particles in the initial exhaust gas to output the first exhaust gas; a concentrated sulfuric acid absorption tower 6 connected to the settling separator 13 via a first conveying pipe 5 for absorbing the sulfided gas in the first exhaust gas to output the second-stage exhaust gas; and a calcium absorption tower 7 connected to the concentrated sulfuric acid absorption tower 6 via a second conveying pipe 11 for calcium-based sulfur fixation of the second-stage exhaust gas to output the target exhaust gas; wherein... The sedimentation separator 13 includes a collection filter 12 and a cleaning spray head 3 disposed above the collection filter 12 for cleaning the collection filter 12; the calcium absorption tower 7 is provided with a spray assembly for spraying calcium absorption liquid onto the secondary tail gas.

[0024] In practice, this invention incorporates a settling separator 13, a concentrated sulfuric acid absorption tower 6, and a calcium absorption tower 7 downstream of the gas-liquid separator 1. The settling separator 13 uses a trapping filter 12 to reduce the impact of liquid and solid particles carried in the initial tail gas on the transport efficiency of subsequent pipelines during the removal of liquid or solid particles. The calcium absorption tower 7 uses a spray assembly with multiple spray groups to perform calcium-based sulfur fixation on the secondary tail gas, resulting in more thorough contact between the calcium absorption liquid and the secondary tail gas, thereby improving the accuracy of calcium absorption.

[0025] Specifically, the sulfonation reaction mechanism also includes a sulfur trioxide delivery pipe 4 connected to the sulfonation reactor 2 for delivering gaseous sulfur trioxide into the sulfonation reactor 2.

[0026] Specifically, the vertical distance between the cleaning spray head 3 and the trapping filter 12 is greater than the maximum vertical movement distance of the cleaning liquid when it is atomized into a preset particle size range.

[0027] Specifically, the preset particle size range is determined according to production requirements, and this embodiment does not limit the preset particle size range.

[0028] In practice, this invention reduces the effective contact area and contact amount between the cleaning spray head 3 and the trapping filter 12 by setting the vertical distance between them to be greater than the maximum vertical movement distance of the cleaning liquid when it is atomized to a preset particle size range. This is because the spraying position of the cleaning liquid changes due to the cleaning spray head 3 being too close to the trapping filter 12 or the wear or tear of the cleaning liquid spray head, which in turn reduces the effective contact area and contact amount between the cleaning liquid and the polymer material attached to the surface of the filter port in the trapping filter 12. This improves the accuracy of particle capture.

[0029] Specifically, the upper outlet and lower inlet of the trapping filter 12 are respectively equipped with a first pressure sensor for detecting the first pressure of the first exhaust gas after passing through the trapping filter 12 and a second pressure sensor for detecting the second pressure of the space in the settling separator 13 below the trapping filter 12, wherein, The cleaning spray head 3 responds when the difference between the first air pressure and the second air pressure is greater than a preset difference.

[0030] Optionally, the preset difference can be selected within the range of [0.01 kPa, 0.03 kPa].

[0031] Preferably, the preferred embodiment of the preset difference is 0.02 kPa.

[0032] Specifically, a third conveying pipeline 15 for conveying gaseous sulfur trioxide to the concentrated sulfuric acid absorption tower 6 and a control valve 14 for controlling the gas flow rate of gaseous sulfur trioxide in the third conveying pipeline 15 are provided between the concentrated sulfuric acid absorption tower 6 and the sulfur trioxide conveying pipeline 4.

[0033] Specifically, the spray assembly includes a spray group arranged from top to bottom inside the calcium absorption tower 7 for spraying calcium-based hand sanitizer onto the secondary exhaust gas. A single spray assembly includes a mounting rod and several absorbent spray heads 8 evenly spaced on the mounting rod.

[0034] Specifically, the calcium absorption tower 7 is also equipped with a recovery tank 10 for storing diluted calcium absorption liquid.

[0035] Specifically, the closest straight-line distance between the lowermost spray group and the recovery tank 10 is less than the straight-line distance between the uppermost spray group and the tail gas outlet of the calcium absorption tower 7.

[0036] In implementation, this invention ensures that the shortest straight-line distance between the lowest spray group and the recovery tank 10 is less than the straight-line distance between the uppermost spray group and the exhaust gas outlet of the calcium absorption tower 7. When the droplets generated by the lower spray layer are too small, or the exhaust gas velocity is too fast, some fine droplets will be carried out of the calcium absorption tower 7 by the airflow, thus forming a mist. These mists may contain unreacted calcium absorbent or some reaction products. Therefore, by making the shortest straight-line distance between the lowest spray group and the recovery tank 10 less than the straight-line distance between the uppermost spray group and the exhaust gas outlet of the calcium absorption tower 7, the space between the spray layer and the liquid surface of the recovery tank 10 is reduced. This allows the airflow to impact the liquid surface of the recovery tank 10 before accelerating these droplets to their maximum speed, thus actively removing the mist.

[0037] Specifically, the lowest spray group is located above the air inlet of the calcium absorption tower 7.

[0038] Specifically, a circulation pump 9 for circulating calcium absorption liquid is also provided between the recycling tank 10 and the spray assembly.

[0039] The technical solution of this utility model has been described above with reference to the preferred embodiments shown in the accompanying drawings. However, it will be readily understood by those skilled in the art that the protection scope of this utility model is obviously not limited to these specific embodiments. Without departing from the principle of this utility model, those skilled in the art can make equivalent changes or substitutions to the relevant technical features, and the technical solutions after these changes or substitutions will all fall within the protection scope of this utility model.

Claims

1. A combined tail gas purification device in a sulfonation production process, characterized in that, include: The sulfonation reaction apparatus includes a sulfonation reactor for carrying out a sulfonation reaction to output reaction products and initial tail gas respectively, and a gas-liquid separator connected to the sulfonation reactor for separating the reaction products and initial tail gas. The exhaust gas treatment and purification mechanism, connected to the sulfonation reaction mechanism, includes a settling separator connected to the gas-liquid separator for collecting liquid and solid particles in the initial exhaust gas to output the first exhaust gas; a concentrated sulfuric acid absorption tower connected to the settling separator via a first conveying pipe for absorbing sulfided gases in the first exhaust gas to output the second-stage exhaust gas; and a calcium absorption tower connected to the concentrated sulfuric acid absorption tower via a second conveying pipe for calcium-based sulfur fixation of the second-stage exhaust gas to output the target exhaust gas; wherein... The sedimentation separator includes a trapping filter and a cleaning spray head disposed above the trapping filter for cleaning the trapping filter; the calcium absorption tower is equipped with a spray assembly for spraying calcium absorption liquid onto the secondary exhaust gas.

2. The combined tail gas purification device in the sulfonation production process according to claim 1, characterized in that, The sulfonation reaction apparatus also includes a sulfur trioxide delivery pipeline connected to the sulfonation reactor for delivering gaseous sulfur trioxide into the sulfonation reactor.

3. The combined tail gas purification device in the sulfonation production process according to claim 2, characterized in that, The vertical distance between the cleaning spray head and the trapping filter is greater than the maximum vertical movement distance of the cleaning liquid when it is atomized into a preset particle size range.

4. The combined tail gas purification device in the sulfonation production process according to claim 3, characterized in that, The upper outlet and lower inlet of the trapping filter are respectively equipped with a first pressure sensor for detecting the first gas pressure of the first exhaust gas after passing through the trapping filter and a second pressure sensor for detecting the second gas pressure of the sedimentation separator space below the trapping filter. The cleaning spray head responds when the difference between the first air pressure and the second air pressure is greater than a preset difference.

5. The combined tail gas purification device in the sulfonation production process according to claim 4, characterized in that, A third conveying pipeline for conveying gaseous sulfur trioxide to the concentrated sulfuric acid absorption tower and a control valve for controlling the gas flow rate of gaseous sulfur trioxide in the third conveying pipeline are provided between the concentrated sulfuric acid absorption tower and the sulfur trioxide conveying pipeline.

6. The combined tail gas purification device in the sulfonation production process according to claim 5, characterized in that, The spray assembly includes spray groups arranged from top to bottom inside the calcium absorption tower for spraying calcium-based hand sanitizer onto the secondary exhaust gas. A single spray assembly includes a mounting rod and several absorbent spray heads evenly spaced on the mounting rod.

7. The combined tail gas purification device in the sulfonation production process according to claim 6, characterized in that, The calcium absorption tower is also equipped with a recovery tank for storing diluted calcium absorption solution.

8. The combined tail gas purification device in the sulfonation production process according to claim 7, characterized in that, The shortest straight-line distance between the bottommost spray group and the recovery tank is less than the straight-line distance between the topmost spray group and the tail gas outlet of the calcium absorption tower.

9. The combined tail gas purification device in the sulfonation production process according to claim 8, characterized in that, The lowest spray group is located above the air inlet of the calcium absorption tower.

10. The combined tail gas purification device in the sulfonation production process according to claim 9, characterized in that, A circulation pump for circulating calcium absorption solution is also provided between the recycling tank and the spray assembly.

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