Sulfur dioxide gas removal device in sulfur trioxide preparation process
By using hydrogen peroxide to react with sulfur dioxide gas to generate sulfuric acid liquid during the sulfur trioxide preparation process, and combining this with a spray head system and flue gas analyzer control, the problem of reduced product quality caused by the mixing of sulfur dioxide gas and sulfur trioxide liquid was solved, thus achieving improved quality of sulfur trioxide product and stable operation of the equipment.
Patent Information
- Application Number
- CN202423284873.8
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-12-31
- Publication Date
- 2026-02-13
- Estimated Expiration
- 2034-12-31
AI Technical Summary
During the preparation of sulfur trioxide, the mixing of sulfur dioxide gas and sulfur trioxide liquid leads to a decrease in the quality of the finished product, which is difficult to remove effectively.
The process involves reacting hydrogen peroxide with sulfur dioxide gas to generate sulfuric acid liquid. Sulfur dioxide gas is then removed from gaseous sulfur trioxide through a metering pump, delivery pipe, and spray head system. The hydrogen peroxide flow is controlled by the interval setting of the spray heads and atomized spray head technology, combined with a flue gas analyzer, to avoid localized high-temperature corrosion.
It effectively removes sulfur dioxide gas, improves the quality of sulfur trioxide products, avoids localized high-temperature corrosion, and ensures the stable operation of the equipment.
Smart Images
Figure CN223901558U_ABST
Abstract
Description
TECHNICAL FIELD
[0001] The utility model relates to sulfur trioxide preparation device field especially is sulfur trioxide preparation process in two sulfur dioxide gas removal device. BACKGROUND
[0002] The company's current liquid sulfur trioxide is prepared by heating fuming sulfuric acid, and the problem is that the sulfur trioxide gas prepared by the fuming sulfuric acid contains a small amount of sulfur dioxide. These sulfur dioxide will vaporize and evaporate with the sulfur trioxide because of the low boiling point. The sulfur dioxide gas condenses into liquid sulfur dioxide in the later stage and mixes with the sulfur trioxide liquid, resulting in a decrease in the quality of the sulfur trioxide liquid product caused by the presence of a small amount of liquid sulfur dioxide. However, liquid sulfur dioxide is relatively stable and unreactive. Therefore, it is difficult to remove liquid sulfur dioxide from the sulfur trioxide liquid in the subsequent process. In order to improve the quality of the company's sulfur trioxide product, a sulfur dioxide gas removal device for sulfur trioxide preparation is provided. SUMMARY
[0003] The purpose of the utility model is to provide a sulfur dioxide gas removal device for sulfur trioxide preparation in the case of gaseous sulfur trioxide, which removes most of the sulfur dioxide gas by using hydrogen peroxide, thereby improving the quality of the sulfur trioxide product.
[0004] The technical solution of the utility model is:
[0005] A sulfur dioxide gas removal device for sulfur trioxide preparation, comprising a hydrogen peroxide storage tank, a metering pump, a liquid delivery pipe, and multiple branch pipes. The hydrogen peroxide storage tank contains hydrogen peroxide. The inlet of the metering pump is connected to the hydrogen peroxide storage tank through a pipeline. The outlet of the metering pump is connected to a "7" shaped liquid delivery pipe. The top ends of the multiple branch pipes are connected to the liquid delivery pipe. The bottom ends of the multiple branch pipes are inserted into a gas delivery pipe and connected to spray heads. The gas delivery pipe contains sulfur trioxide gas prepared by fuming sulfuric acid, and the sulfur trioxide gas contains a small amount of sulfur dioxide gas. The gas delivery pipe contains sulfur trioxide gas and sulfur dioxide gas. The spray heads are arranged alternately above and below and spaced apart. The distance between the spray heads and the inner wall of the gas delivery pipe is greater than or equal to 3 mm. Electromagnetic valves are arranged on the branch pipes.
[0006] Further, the minimum horizontal distance between the spray heads is 5 mm. When the distance between the spray heads is less than 10 cm, the spray heads are arranged alternately above and below, and the distance between the upper and lower spray heads is greater than 3 cm.
[0007] The spray heads are atomizing spray heads, specifically pressure atomizing spray heads.
[0008] Further, the inner diameter of the branch pipe is between 4mm and 12mm, preferably 5mm;
[0009] The diameter of the gas conveying pipe is between 20cm and 40cm, preferably 25cm;
[0010] Further, the gas conveying pipe is provided with a flue gas analyzer near the gas inlet end, the flue gas analyzer, the electromagnetic valve and the metering pump are electrically connected to the terminal controller, the terminal controller strictly controls the liquid delivery amount of the metering pump according to the sulfur dioxide gas content analyzed by the flue gas analyzer;
[0011] Further, the gas conveying pipe is inclined upward from the gas inlet end to the gas outlet end, the gas conveying pipe is provided with a recovery port at the gas inlet end, the top end of the recovery pipe is communicated with the gas conveying pipe through the recovery port, and the bottom end of the recovery pipe is communicated with the collection tank;
[0012] Further, the hydrogen peroxide storage tank is provided with a polytetrafluoroethylene layer, the polytetrafluoroethylene layer is in contact with the hydrogen peroxide, and the liquid delivery pipe and the branch pipe are made of polytetrafluoroethylene material;
[0013] The utility model has the advantages and positive effects that:
[0014] The sulfur trioxide gas prepared by fuming sulfuric acid contains a small amount of sulfur dioxide gas, most of which is removed before the sulfur dioxide gas is cooled and liquefied, and the hydrogen peroxide is added into the above-mentioned gas through the metering pump, the liquid delivery pipe and the branch pipe, at this time, the hydrogen peroxide reacts with the sulfur dioxide gas, the reaction formula is: SO2+H2O2=H2SO4, and sulfuric acid liquid is generated, so that most of the sulfur dioxide gas can be removed, and the quality of the sulfur trioxide product is further improved.
[0015] A large amount of heat is released during the reaction of hydrogen peroxide and sulfur dioxide gas, and if the heat is released locally, the pipe will be damaged and broken in a short time, a plurality of spray heads are arranged at intervals, and the plurality of spray heads are arranged in an upper and lower staggered manner, so that the hydrogen peroxide and the sulfur dioxide gas are added in a small amount and dispersed, which can ensure that the amount of hydrogen peroxide added is sufficient for the reaction of hydrogen peroxide and sulfur dioxide gas, and can avoid the problem of local high temperature corrosion of the gas conveying pipe.
[0016] Since the spray head is a purchased atomizing spray head, the reaction effect with the sulfur dioxide gas is better, and the removal effect of the sulfur dioxide gas is better.
[0017] The gas inlet end of the gas conveying pipe is provided with a flue gas analyzer, the sulfur dioxide gas content is analyzed by the flue gas analyzer, and the terminal controller strictly controls the liquid delivery amount of the metering pump according to the sulfur dioxide gas content, so that the removal effect of the sulfur dioxide gas is ensured.
[0018] Because the gas pipeline slopes upwards from the inlet to the outlet, the generated sulfuric acid falls onto the pipeline due to gravity and flows downwards along the slope. Since sulfur trioxide gas does not react with hydrogen peroxide, it enters the next stage through the outlet. Because the top of the recovery pipe is connected to the gas pipeline through the recovery port, sulfuric acid and scum are collected through the recovery pipe and collection tank, further improving the quality of the sulfur trioxide product.
[0019] Because the hydrogen peroxide storage tank has a polytetrafluoroethylene (PTFE) layer inside, and the PTFE layer is in contact with the hydrogen peroxide, the delivery pipe and branch pipes are also made of PTFE material, thus avoiding the impact of metal residue in the metal storage tank and pipes on the quality of sulfur trioxide. Attached Figure Description
[0020] Figure 1 This is a schematic diagram of the sulfur dioxide gas removal device in the sulfur trioxide preparation process of this utility model.
[0021] Figure 2 This is a schematic diagram of the sulfur dioxide gas removal device in the sulfur trioxide preparation process of this invention, when the gas pipeline slopes upwards from the inlet to the outlet.
[0022] In the diagram: 1. Hydrogen peroxide storage tank; 2. Metering pump; 3. Liquid delivery pipe; 4. Branch pipe; 5. Spray head; 6. Solenoid valve; 7. Flue gas analyzer; 8. Recovery pipe; 9. Collection tank; 10. Gas transmission pipe. Detailed Implementation
[0023] Example 1:
[0024] like Figure 1 As shown, a sulfur dioxide gas removal device in the sulfur trioxide preparation process includes a hydrogen peroxide storage tank 1, a metering pump 2, a liquid delivery pipe 3, and three branch pipes 54. The hydrogen peroxide storage tank 1 has a polytetrafluoroethylene (PTFE) layer inside. The liquid delivery pipe 3 and branch pipes 54 are also made of PTFE, and hydrogen peroxide is stored within the PTFE layer. The inlet of the metering pump 2 is connected to the hydrogen peroxide storage tank 1 via a pipe. The outlet of the metering pump 2 is connected to the "7"-shaped liquid delivery pipe 3. The top ends of the three branch pipes 54 are respectively connected to the liquid delivery pipe 3. The inner diameter of each of the three branch pipes 54 is 5mm, and each branch pipe 54 is equipped with a solenoid valve 6. The bottom ends of each of the three branch pipes 54 are inserted into a 26cm inner diameter gas delivery pipe 10 and then connected to a purchased atomizing spray head. The atomizing spray head is very small, about the size of a fingernail. The three spray heads extend from the inlet to the outlet... Figure 1 The spray nozzles are arranged alternately from left to right, top to bottom and top, and the distance between each spray nozzle and the inner wall of the gas supply pipe 10 is 5mm. The horizontal distance between the three spray nozzles is 10cm and the vertical distance is 6cm.
[0025] The gas inlet end of the gas pipe 10 is provided with a flue gas analyzer 7 near the gas inlet, and the flue gas analyzer 7, the electromagnetic valve 6, and the metering pump 2 are electrically connected to a terminal controller.
[0026] In operation, sulfur trioxide gas prepared from fuming sulfuric acid is introduced into the gas pipe 10 from the gas inlet end, and the sulfur trioxide gas contains a small amount of sulfur dioxide gas, that is, the sulfur trioxide gas containing sulfur dioxide gas is introduced into the gas pipe 10, at which time the flue gas analyzer 7 measures the content of sulfur dioxide and transmits it to the terminal controller, which strictly controls the liquid delivery amount of the metering pump 2 according to the content of sulfur dioxide gas. Since a relatively thin pipe is used in cooperation with the on-off state of the electromagnetic valve 6, the amount of addition can be accurately controlled. When the content of sulfur dioxide is low, the first left atomizing type spray head and the third left atomizing type spray head can be sprayed for a very short time and then stopped, and the middle atomizing type spray head is sprayed. In this process, a large amount of heat is released during the reaction of hydrogen peroxide and sulfur dioxide gas, and if the heat is released locally, the pipe will be damaged and a hole will be formed in a very short time. By spacing multiple spray heads and staggering the multiple spray heads above and below, a small amount of hydrogen peroxide is added, which can ensure that the amount of hydrogen peroxide added is sufficient for the reaction with sulfur dioxide gas and can also avoid the problem of local high-temperature corrosion of the gas pipe 10.
[0027] When the content of sulfur dioxide becomes high, the three spray heads can work at the same time. Since there is a spacing between the three spray heads above and below and left and right, the problem of local high-temperature corrosion of the gas pipe 10 can also be avoided.
[0028] Through the device, most of the sulfur dioxide gas is removed before it is cooled and liquefied. Specifically, hydrogen peroxide is added to the above-mentioned gas through the metering pump 2, the liquid delivery pipe 3, and the branch pipe 54, at which time the hydrogen peroxide reacts with the sulfur dioxide gas, the reaction formula is: SO2+H2O2=H2SO4, and sulfuric acid liquid is generated, so that part of the sulfur dioxide gas is removed, thereby improving the quality of the sulfur trioxide product.
[0029] Example 2:
[0030] The utility model provides a kind of sulfur trioxide preparation process in sulfur dioxide gas removal device, including hydrogen peroxide storage tank 1, metering pump 2, liquid sending pipe 3 and 3 branch pipes 54, the polytetrafluoroethylene layer is equipped in the hydrogen peroxide storage tank 1, the liquid sending pipe 3, branch pipe 54 all use polytetrafluoroethylene material, the polytetrafluoroethylene layer is equipped with hydrogen peroxide, the liquid inlet of metering pump 2 is connected hydrogen peroxide storage tank 1 by pipeline, the liquid outlet of metering pump 2 is connected with the liquid sending pipe 3 of ''7'' shape, the top of 3 branch pipes 54 is communicated with liquid sending pipe 3 respectively, the inner diameter of 3 branch pipes 54 currently used is all 4mm, 3 spray heads are distributed in the gas inlet end, middle, gas outlet end of gas conveying pipe 10, and electromagnetic valve 6 is equipped on branch pipe 54 respectively, the bottom of 3 branch pipes 54 is inserted into the gas conveying pipe 10 of 25cm inner diameter and then connected with the atomizing type spray head purchased, the volume of atomizing type spray head is very small, about the size of nail cover, 3 spray heads are arranged from left to right on, below, upper staggered and spaced from gas inlet end to gas outlet end (in Figure 1 The utility model discloses a kind of sulfur trioxide preparation process in sulfur dioxide gas removal device, including hydrogen peroxide storage tank 1, metering pump 2, liquid sending pipe 3 and 3 branch pipes 54, the polytetrafluoroethylene layer is equipped in the hydrogen peroxide storage tank 1, the liquid sending pipe 3, branch pipe 54 all use polytetrafluoroethylene material, the polytetrafluoroethylene layer is equipped with hydrogen peroxide, the liquid inlet of metering pump 2 is connected hydrogen peroxide storage tank 1 by pipeline, the liquid outlet of metering pump 2 is connected with the liquid sending pipe 3 of ''7'' shape, the top of 3 branch pipes 54 is communicated with liquid sending pipe 3 respectively, the inner diameter of 3 branch pipes 54 currently used is all 4mm, 3 spray heads are distributed in the gas inlet end, middle, gas outlet end of gas conveying pipe 10, and electromagnetic valve 6 is equipped on branch pipe 54 respectively, the bottom of 3 branch pipes 54 is inserted into the gas conveying pipe 10 of 25cm inner diameter and then connected with the atomizing type spray head purchased, the volume of atomizing type spray head is very small, about the size of nail cover, 3 spray heads are arranged from left to right on, below, upper staggered and spaced from gas inlet end to gas outlet end (in
[0031] When working, sulfur trioxide gas prepared from smoking sulfuric acid is introduced into the gas conveying pipe 10 from the gas inlet end, and the sulfur trioxide gas contains a small amount of sulfur dioxide gas, that is, the sulfur trioxide gas containing sulfur dioxide gas is introduced into the gas conveying pipe 10, at this time, the flue gas analyzer 7 measures the content of sulfur dioxide and transmits it to the terminal controller, the terminal controller strictly controls the liquid sending amount of the metering pump 2 according to the content of sulfur dioxide gas, hydrogen peroxide reacts with sulfur dioxide gas, the reaction formula is: SO2+H2O2=H2SO4, sulfuric acid liquid is generated, so that most of the sulfur dioxide gas can be removed, thereby improving the quality of sulfur trioxide product.
[0032] Example 3:
[0033] On the basis of example 2, as Figure 2As shown, the gas conveying pipe 10 is inclined upward from the gas inlet end to the gas outlet end, the gas conveying pipe 10 is provided with a recovery port at the gas inlet end, the top end of the recovery pipe 8 is communicated with the gas conveying pipe 10 through the recovery port, and the bottom end of the recovery pipe 8 is communicated with the collecting tank 9; since the gas conveying pipe 10 is inclined upward from the gas inlet end to the gas outlet end, the generated sulfuric acid falls into the gas conveying pipe 10 due to gravity and flows downward along the downward inclination, since the sulfur trioxide gas does not react with the hydrogen peroxide, the sulfur trioxide gas will enter the next link through the gas outlet end; since the top end of the recovery pipe 8 is communicated with the gas conveying pipe 10 through the recovery port, the sulfuric acid and the floating foam are collected through the recovery pipe 8 and the collecting tank 9, and the quality of the sulfur trioxide product is further improved.
[0034] In the description of the present application, it should be understood that the terms "upper", "lower", "front", "back", "left", "right", "top", "bottom", "inner", "outer" and the like indicate the orientation or positional relationship based on the drawings of the present application, and are only for convenience of describing the present application and simplifying the description, and are not intended to indicate or imply that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as limiting the present application. Figure 1 The orientation or positional relationship shown is only for the convenience of describing the present application and simplifying the description, and is not intended to indicate or imply that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as limiting the present application.
[0035] The above describes one embodiment of the present application in detail, but the content described is only a preferred embodiment of the present application, and cannot be considered as limiting the implementation range of the present application. Any equivalent changes and improvements made within the scope of the present application should still belong to the patent coverage range of the present application.
Claims
1. A sulfur dioxide gas removal device in the sulfur trioxide preparation process, characterized in that: The device includes a hydrogen peroxide storage tank, a metering pump, a delivery pipe, and multiple branch pipes. The hydrogen peroxide storage tank contains hydrogen peroxide. The inlet of the metering pump is connected to the hydrogen peroxide storage tank via a pipe. The outlet of the metering pump is connected to a "7"-shaped delivery pipe. The top ends of the multiple branch pipes are connected to the delivery pipe, and the bottom ends of the multiple branch pipes are inserted into a gas transmission pipe and connected to spray heads. Sulfur trioxide gas containing sulfur dioxide gas is introduced into the gas transmission pipe. The multiple spray heads are staggered and spaced apart, and the distance between the multiple spray heads and the inner wall of the gas transmission pipe is ≥3mm. Each of the multiple branch pipes is equipped with a solenoid valve.
2. The sulfur dioxide gas removal device in the sulfur trioxide preparation process according to claim 1, characterized in that: The minimum lateral distance between the spray heads is 5mm, and the spray heads are atomizing spray heads.
3. The sulfur dioxide gas removal device in the sulfur trioxide preparation process according to claim 2, characterized in that: When the distance between the spray heads is less than 10cm, multiple spray heads are arranged alternately, one above the other or one below the other, with a vertical distance greater than 3cm.
4. A sulfur dioxide gas removal device in the sulfur trioxide preparation process according to any one of claims 1-3, characterized in that: The inner diameter of the branch pipe is between 4mm and 12mm.
5. The sulfur dioxide gas removal device in the sulfur trioxide preparation process according to claim 4, characterized in that: The diameter of the gas pipeline is between 20cm and 40cm.
6. A sulfur dioxide gas removal device in the sulfur trioxide preparation process according to claim 1, 2, 3, or 5, characterized in that: A flue gas analyzer is installed near the inlet of the gas pipeline. The flue gas analyzer, solenoid valve, and metering pump are electrically connected to the terminal controller.
7. The sulfur dioxide gas removal device in the sulfur trioxide preparation process according to claim 6, characterized in that: The gas pipeline slopes upwards from the inlet to the outlet.
8. The sulfur dioxide gas removal device in the sulfur trioxide preparation process according to claim 7, characterized in that: The gas supply pipe at the air inlet is provided with a recovery port. The top end of the recovery pipe is connected to the gas supply pipe through the recovery port, and the bottom end of the recovery pipe is connected to the collection tank.
9. The sulfur dioxide gas removal device in the sulfur trioxide preparation process according to claim 8, characterized in that: The hydrogen peroxide storage tank is equipped with a polytetrafluoroethylene (PTFE) layer, which is in contact with the hydrogen peroxide. The delivery pipe and branch pipe are both made of PTFE.