CN211435657U - Sulfur trioxide emergency closed absorption device - Google Patents
Sulfur trioxide emergency closed absorption device Download PDFInfo
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- CN211435657U CN211435657U CN201922012805.9U CN201922012805U CN211435657U CN 211435657 U CN211435657 U CN 211435657U CN 201922012805 U CN201922012805 U CN 201922012805U CN 211435657 U CN211435657 U CN 211435657U
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Abstract
The utility model discloses an emergent absorptive device that seals of sulfur trioxide: emergent absorbing hood and alkaline washing tower intercommunication, the alkaline washing tower top is connected with the washing tower bottom, and the washing tower top is connected to the tail gas fan, and the tail gas fan is connected with the electrostatic precipitator. The middle part of the alkaline tower is provided with an absorption liquid feeding pipeline; the bottom of the alkaline washing tower is connected with the circulating absorption pump 1 through a pipeline and then connected with the top of the alkaline washing tower, and a tail acid extraction pipeline is arranged at the outlet of the circulating absorption pump 1; the bottom of the washing tower is connected with the circulating absorption pump 2 through a pipeline and then connected with the top of the washing tower. In the technical process that adopts the device to go on, the sulfur trioxide or sulfur trioxide tank car blowdown gas that leaks get into the alkaline tower through emergent absorption cover under the effect of tail gas fan, get into the scrubbing tower after reacting with the absorption liquid, make the sulfur trioxide gas that sulfur trioxide is unreacted absorb water and become acid mist, get into the static defroster at last, get rid of after the acid mist, tail gas discharge to reach standard, the dilute sulphuric acid recovery reuse that the alkaline tower produced.
Description
Technical Field
The utility model relates to a vulcanize worker's technique and safety ring protects the field, in particular to sulfur trioxide emergency seal absorbing device and method.
Background
The sulfur trioxide is a colorless easily sublimable solid and has three forms, namely alpha-SO 3 filamentous fiber and needle, and the melting point is 62.3 ℃; beta-SO 3 asbestos fiber, melting point 62.4 deg.C, sublimable at 50 deg.C; gamma-SO 3 is glassy, has a melting point of 16.8 ℃ and a boiling point of 44.8 ℃. In the production, the common sulfur trioxide is gamma-SO 3 and exists in a liquid state, the sulfur trioxide is dissolved in water and reacts with the water to generate sulfuric acid and release a large amount of heat, the dehydration effect of the sulfur trioxide is stronger than that of sulfuric acid and fuming sulfuric acid, and the sulfur trioxide has strong oxidizing property and corrosive property. The sulfur trioxide can rapidly absorb moisture in the air after leakage to form acid mist, so that not only is the environment pollution caused and the personnel health is endangered, but also the produced acid mist can corrode production equipment, instruments and lines and is extremely harmful.
The electronic-grade sulfuric acid production adopts a sulfur trioxide absorption method for production, the sulfur trioxide as a raw material is transported by a tank car, the discharged materials of the tank car are discharged by high-purity air in a counter-pressure manner, and a small amount of acid mist is formed in the gas part in the tank car after discharging, so that the acid mist is difficult to treat.
No matter the flue gas after sulfur trioxide leakage and the sulfur trioxide tank car discharge gas have a commonality, acid mist is generated, once the single absorption method (acid absorption and alkali absorption) of the acid mist is formed, the acid mist cannot be processed, and a small amount of sulfur dioxide in the sulfur trioxide is difficult to process. The method comprises the steps of carrying out alkali liquor, physical interception, water washing oxidation of sulfur dioxide and electrostatic demisting on the sulfur trioxide tail gas mixed with acid mist, removing the acid mist step by step, washing partial sulfur trioxide in the tail gas with water, converting the sulfur trioxide into sulfuric acid mist, finally treating the sulfuric acid mist by the electrostatic demister to reach the standard and discharging, wherein the generated tail acid can be recycled.
Disclosure of Invention
The utility model aims at solving the problem existing in the sulfur trioxide tail gas absorption prior art that contains the sulfuric acid mist, improving the validity and the reliability of the emergent absorption system of sulfur trioxide, simple process, maneuverability is strong.
The utility model provides a sulfur trioxide emergency closed absorption device, which comprises an emergency absorption cover, a tail gas hose, an alkaline washing tower, a circulating absorption pump 1, a water washing tower, a circulating absorption pump 2, a tail gas fan and an electrostatic demister, wherein the emergency absorption cover is communicated with the alkaline washing tower; the top of the alkaline washing tower is connected with the bottom of the water washing tower; the top of the washing tower is connected to a tail gas fan; the tail gas fan is connected with the electrostatic demister; the bottom of the electrostatic demister is connected to a dilute acid tank; and a tail gas emptying pipe is arranged at the top of the demister.
In the scheme, the middle part of the alkaline tower is provided with an absorption liquid feeding pipeline; the bottom of the alkaline washing tower is connected with the circulating absorption pump 1 through a pipeline and then connected with the top of the alkaline washing tower, and a tail acid extraction pipeline is arranged at the outlet of the circulating absorption pump 1.
In the above scheme, the bottom of the washing tower is connected with the top of the washing tower after being connected with the circulating absorption pump 2 through a pipeline, and the middle part of the washing tower is provided with an ultrapure water supplementing pipeline.
In the scheme, the top of the alkaline washing tower and the top of the water washing tower are both provided with one-level wire mesh packing made of PP, PE or PTFE material wire meshes, and the purpose is to prevent absorption liquid sprayed on the top of the alkaline washing tower and ultrapure water sprayed on the water washing tower from being respectively pumped to the water washing tower and a tail gas fan by tail gas negative pressure and simultaneously intercept part of formed acid mist.
In the scheme, the alkaline washing tower is provided with three stages of packing, the water washing tower is provided with two stages of packing, the liquid collecting and distributing device is arranged below the upper tray, the wall flow effect of the absorption tower can be effectively eliminated, the absorption efficiency is improved, and the packing is pall rings or Raschig rings.
Adopt the emergent absorbing method of sealing of above-mentioned utility model going on sulfur trioxide, choose foretell sulfur trioxide emergent closed absorption device for use, including following step:
(1) sulfur trioxide or sulfur trioxide tank car discharge gas overflowing the production system enters an alkaline tower through an emergency absorption cover under the action of a tail gas fan, reacts with alkali liquor in the alkaline tower, and absorbs and intercepts part of sulfur trioxide and acid mist;
(2) the tail gas after the alkali washing enters a water washing tower, the residual sulfur trioxide absorbs water to form acid mist, a small amount of sulfur dioxide in the tail gas is oxidized by hydrogen peroxide in absorption liquid, the tail gas forms acid mist through water absorption, a part of silk screen is intercepted and then enters an electrostatic demister to remove the acid mist, the tail gas is discharged up to the standard, and acid liquor formed at the bottom of the demister enters a dilute acid tank to be recycled.
In the method, the concentration of the alkali liquor is controlled to be 10-20%, the liquid level of the tower bottom is controlled to be 30-60%, and sulfate crystals are easily formed due to overhigh concentration of the alkali liquor to block the filler.
In the method, the water washing liquid comprises the following components in percentage by mass: 5-20% of hydrogen peroxide, 0.01-10% of inorganic acid and the balance of water, and a small amount of sulfuric acid is added to ensure that the water washing liquid is acidic, so that the hydrogen peroxide is more stable and the loss of the hydrogen peroxide is reduced.
In the method, the liquid level of the washing tower is controlled to be 30-60%, and the tail gas air volume is controlled to be 3000-5000 m3/h。
The method comprises the steps of carrying out alkali liquor, physical interception, water washing oxidation of sulfur dioxide and electrostatic demisting on the sulfur trioxide tail gas mixed with acid mist, removing the acid mist step by step, washing partial sulfur trioxide in the tail gas with water, converting the sulfur trioxide into sulfuric acid mist, finally treating the sulfuric acid mist by the electrostatic demister to reach the standard and discharging, wherein the generated tail acid can be recycled.
The innovation points of the invention are as follows 4 points:
(1) in the technical process of the device, the alkali liquor reacts and absorbs the acid mist formed in the sulfur trioxide tail gas, part of the acid mist is intercepted, the sulfur trioxide gas in the sulfur trioxide tail gas is converted into the acid mist through water washing, the acid mist is discharged after being treated by the electrostatic demister, and the problem that the sulfur trioxide tail gas containing sulfuric acid mist is difficult to absorb due to absorption can be completely solved after the step treatment;
(2) in the process of the device, primary silk screen packing is arranged at the top of each of the alkaline washing tower and the water washing tower, and the sprayers are arranged below the silk screen packing, so that sprayed liquid can be intercepted to enter next equipment, and partial sulfuric acid mist can be intercepted;
(3) in the process of the device, a liquid collecting and distributing device is arranged below tower trays of the alkaline washing tower and the water washing tower, so that the wall flow effect can be effectively eliminated, and the absorption efficiency is improved;
(4) adopt the utility model discloses an in the process that the device goes on, contain hydrogen peroxide solution in the washing liquid of adding in the scrubbing tower, a small amount of sulfur dioxide in the oxidizable tail gas, and add a small amount of sulphuric acid and maintain the washing liquid acidic condition, be favorable to hydrogen peroxide solution stable, reduce hydrogen peroxide solution consumption.
Drawings
FIG. 1 is a diagram of an apparatus for emergency closed absorption of sulfur trioxide. The system comprises an emergency absorption cover 1, a tail gas hose 2, an alkaline washing tower 3, a wire mesh packing 4, a water washing tower packing 5, a distributor 6, a sprayer 7, a circulating absorption pump 8, a water washing tower 9, a circulating absorption pump 2, a tail gas fan 11 and an electrostatic demister 12.
Detailed Description
The present invention is further illustrated by the following examples, but it should not be construed that the scope of the above-described subject matter is limited to the following examples. Various substitutions and alterations can be made without departing from the technical idea of the invention and the scope of the invention is covered by the present invention according to the common technical knowledge and the conventional means in the field.
Example 1
A sulfur trioxide emergency closed absorption device comprises: emergent absorbing hood 1 communicates with alkaline tower 3 through tail gas hose 2, and 3 tops of alkaline tower are connected with 9 bottoms of scrubbing tower, and 9 tops of scrubbing tower are connected to tail gas fan 11, and tail gas fan 11 is connected with electrostatic precipitator 12, and electrostatic precipitator 12 bottom is connected to the dilute acid groove. The middle part of the alkaline tower 3 is provided with an absorption liquid feeding pipeline; the bottom of the alkaline tower 3 is connected with a circulating absorption pump 18 through a pipeline and then connected with the top of the alkaline tower 3, and a tail acid extraction pipeline is arranged at the outlet of the circulating absorption pump 18; the bottom of the water washing tower 9 is connected with the top of the water washing tower 9 after being connected with the circulating absorption pump 210 through a pipeline, and the middle part of the water washing tower 9 is provided with an ultrapure water replenishing pipeline.
Example 2
The production method of the electronic-grade sulfuric acid comprises the following steps: leaking sulfur trioxide or sulfur trioxide tank car blowdown gas enters an alkaline tower through an emergency absorption cover under the action of a tail gas fan, enters a water scrubber after reacting with absorption liquid, so that unreacted sulfur trioxide gas absorbs water to become acid mist, finally enters an electrostatic demister, and after the acid mist is removed, tail gas is discharged up to the standard, and dilute sulfuric acid generated by the alkaline tower is recycled.
An absorption liquid feeding pipeline is arranged in the middle of the alkaline washing tower; the bottom of the alkaline washing tower is connected with the circulating absorption pump 1 through a pipeline and then connected with the top of the alkaline washing tower, and a tail acid extraction pipeline is arranged at the outlet of the circulating absorption pump 1;
the bottom of the washing tower is connected with the top of the washing tower after being connected with the circulating absorption pump 2 through a pipeline, and the middle part of the washing tower is provided with an ultrapure water supplementing pipeline.
The alkaline washing tower top all is equipped with one-level silk screen packing with the washing tower top, and the material is PP, PE or PTFE material silk screen, and its aim at avoids the absorption liquid that the alkaline washing tower top sprayed and the ultrapure water that the washing tower sprayed to be taken out respectively washing tower and tail gas fan by the tail gas negative pressure, intercepts the acid mist that the part has formed simultaneously.
The alkaline washing tower is provided with three-stage packing, the water washing tower is provided with two-stage packing, the liquid collecting and distributing device is arranged below the upper tray, the wall flow effect of the absorption tower can be effectively eliminated, the absorption efficiency is improved, and the packing is pall rings or Raschig rings.
The sulfur trioxide emergency closed absorption method selects the sulfur trioxide emergency closed absorption device and comprises the following steps:
(1) sulfur trioxide or sulfur trioxide tank car discharge gas overflowing the production system enters an alkaline tower through an emergency absorption cover under the action of a tail gas fan, reacts with alkali liquor in the alkaline tower, and absorbs and intercepts part of sulfur trioxide and acid mist;
(2) the tail gas after the alkali washing enters a water washing tower, the residual sulfur trioxide absorbs water to form acid mist, a small amount of sulfur dioxide in the tail gas is oxidized by hydrogen peroxide in absorption liquid, the tail gas forms acid mist through water absorption, a part of silk screen is intercepted and then enters an electrostatic demister to remove the acid mist, the tail gas is discharged up to the standard, and acid liquor formed at the bottom of the demister enters a dilute acid tank to be recycled.
The concentration of the alkali liquor is controlled to be 10-20%, the liquid level of a tower kettle is controlled to be 30-60%, and sulfate crystals are easily formed due to overhigh concentration of the alkali liquor to block fillers;
the washing liquid comprises the following components in percentage by mass: 5-20% of hydrogen peroxide, 0.01-10% of inorganic acid and the balance of water, wherein a small amount of sulfuric acid is added to ensure that the water washing liquid is acidic, so that hydrogen peroxide is more stable and the loss of hydrogen peroxide is reduced;
the liquid level of the washing tower is controlled to be 30-60%, and the air volume of the tail gas is controlled to be 3000-5000 m3/h。
The sulfur trioxide seals emergent absorbing method of this embodiment chooses foretell sulfur trioxide to seal emergent absorbing device for use, with the tail gas and emergent absorption cover, the tail gas hose connection after sulfur trioxide tank wagon is unloaded, includes following steps:
the concentration of the alkali liquor is controlled to be 12 percent, and the liquid level of the tower kettle is controlled to be 45 percent;
the washing liquid comprises the following components in percentage by mass: 8% of hydrogen peroxide, 2% of inorganic acid and the balance of water;
the liquid level of the washing tower is controlled at 50 percent, and the air quantity of the tail gas is controlled at 4000m3/h。
Through detection, the concentration of sulfuric acid in the dilute acid tank is 42.5%, the concentration of metal ions is less than 1ppm, the dilute acid tank can be recycled, sulfur trioxide flue gas is treated, and the gas discharged from the outlet of the electrostatic demister meets the national standard.
Example 3
Referring to fig. 1, the procedure for carrying out example 2 is as follows:
the concentration of the alkali liquor is controlled to be 15 percent, and the liquid level of the tower kettle is controlled to be 45 percent;
the washing liquid comprises the following components in percentage by mass: 8% of hydrogen peroxide, 2% of inorganic acid and the balance of water;
the liquid level of the water washing tower is controlled at 45 percent, and the air volume of the tail gas is controlled at 3500m3/h。
Through detection, the concentration of sulfuric acid in the dilute acid tank is 44.3%, the concentration of metal ions is less than 1ppm, the dilute acid tank can be recycled, sulfur trioxide flue gas is treated, and the gas discharged from the outlet of the electrostatic demister meets the national standard.
Example 4
Referring to fig. 1, the procedure of example 2 is as follows:
the sulfur trioxide seals emergent absorbent method of sulfur trioxide of this embodiment chooses foretell sulfur trioxide to seal emergent absorbing device for use, and production system nicotinic acid groove and emergent absorption cover, tail gas hose are connected, and the nicotinic acid groove can produce a large amount of sulfur trioxide smog when the replacement washs acid, includes following step:
the concentration of the alkali liquor is controlled to be 15 percent, and the liquid level of the tower kettle is controlled to be 45 percent;
the washing liquid comprises the following components in percentage by mass: 8% of hydrogen peroxide, 2% of inorganic acid and the balance of water;
the liquid level of the water washing tower is controlled at 45 percent, and the air volume of the tail gas is controlled at 3500m3/h。
Through detection, the sulfuric acid concentration of the dilute acid tank is 42.5%, the metal ion concentration is less than 1ppm, the dilute acid tank can be recycled, a large amount of sulfur trioxide smoke can be generated when the production system nicotinic acid tank is used for replacing and cleaning acid, the sulfur trioxide smoke is introduced into a sulfur trioxide closed emergency absorption system through an emergency absorption cover, the gas discharged from an outlet of the electrostatic demister meets the national standard after treatment, and the sulfur trioxide smoke in a production site is thoroughly solved.
Claims (5)
1. The utility model provides an emergent absorptive device that seals of sulfur trioxide, its characterized in that, includes emergent absorption hood (1), tail gas hose (2), caustic wash tower (3), cyclic absorption pump 1 (8), water scrubber (9), cyclic absorption pump 2 (10), tail gas fan (11), static defroster (12), emergent absorption hood (1) is through tail gas hose (2) and caustic wash tower (3) intercommunication, and the pipeline is passed through at caustic wash tower (3) top and water scrubber (9) sub-unit connection, and water scrubber (9) top is connected through pipeline and tail gas fan (11), and tail gas fan (11) are connected with static defroster (12), and static defroster (12) bottom is connected to the dilute acid groove, and the defroster top is provided with the tail gas blow-down pipe.
2. The device for the emergency closed absorption of sulfur trioxide according to claim 1, characterized in that the caustic wash tower (3) is provided with a lye feed line in the middle; the bottom of the alkaline tower (3) is connected with the circulating absorption pump 1 (8) through a pipeline and then is connected with the top of the alkaline tower, and a tail acid extraction pipeline is arranged on an outlet pipeline of the circulating absorption pump 1 (8).
3. The device for the emergency closed absorption of sulfur trioxide according to claim 1, characterized in that the bottom of the water scrubber (9) is connected with the circulating absorption pump 2 (10) through a pipeline and then connected with the top of the water scrubber (9), and the middle part of the water scrubber is provided with an ultrapure water replenishing pipeline.
4. The device for the emergency closed absorption of sulfur trioxide according to claim 1, characterized in that the top of the alkaline tower (3) and the top of the water scrubber (9) are both provided with primary wire mesh packing.
5. The apparatus for the emergency close absorption of sulfur trioxide according to claim 1, characterized in that the caustic tower (3) is provided with three stages of packing, the water scrubber (9) is provided with two stages of packing, and a liquid collector and distributor (6) is provided below the upper tray.
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| CN201922012805.9U CN211435657U (en) | 2019-11-20 | 2019-11-20 | Sulfur trioxide emergency closed absorption device |
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| CN201922012805.9U CN211435657U (en) | 2019-11-20 | 2019-11-20 | Sulfur trioxide emergency closed absorption device |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115041013A (en) * | 2022-07-06 | 2022-09-13 | 南京飞锦环保科技有限公司 | Deodorization tower for biological deodorization based on pollution control |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115041013A (en) * | 2022-07-06 | 2022-09-13 | 南京飞锦环保科技有限公司 | Deodorization tower for biological deodorization based on pollution control |
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Address after: 443007 no.66-3, Yiting Avenue, Yiting District, Yichang City, Hubei Province Patentee after: Hubei Xingfu Electronic Materials Co.,Ltd. Address before: 443007 no.66-3, Yiting Avenue, Yiting District, Yichang City, Hubei Province Patentee before: HUBEI SINOPHORUS ELECTRONIC MATERIALS CO.,LTD. |
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