CN102743956A - Process for preparing sulfuric acid by using regenerative gas obtained from active coke desulphurization - Google Patents
Process for preparing sulfuric acid by using regenerative gas obtained from active coke desulphurization Download PDFInfo
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- CN102743956A CN102743956A CN2012102579490A CN201210257949A CN102743956A CN 102743956 A CN102743956 A CN 102743956A CN 2012102579490 A CN2012102579490 A CN 2012102579490A CN 201210257949 A CN201210257949 A CN 201210257949A CN 102743956 A CN102743956 A CN 102743956A
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Abstract
The invention belongs to the technical field of comprehensive utilization of environmental protection, in particular relates to a process for preparing sulfuric acid by using a regenerative gas obtained from active coke desulphurization. The process comprises the following steps that: an SO2 smoke gas emitted from a regeneration draught fan is reduced in temperature to 170-190 DEG C through a heat pipe boiler and then enters a gas purification system; the SO2 smoke gas is reduced in temperature and removed in dust by an inside-spray venturi and a foaming tower and then defogged; the defogged smoke gas is mixed with supplementary air into a gas which is at 36-40 DEG C and contains 8%-9% of SO2, and the gas is dried and then enters a converting system, wherein conversion rate is 96%-97%; the converted gas enters an absorption system through a coal economizer so that a finished sulfuric acid product is produced; and an absorbed tail gas is returned to a main smoke gas desulphurization device for further SO2 removal, wherein the evacuated SO2 is lower than 200 mg/m<3>. The process has the advantages of single-absorption conversion, simple procedure, small investment, little resistance, high heat utilization ratio without outside waste water discharge; according to the process, the absorbed tail gas is far lower than the national standard requirement and can reach 200 mg/m<3>, the varieties of products can be adjusted according to market demands, and other chemical products can be produced through further development.
Description
Technical field
The invention belongs to environmental protection comprehensive utilization technique field, relate to a kind of post-processing approach, particularly active coke desulphurizing regeneration gas process for preparing sulfuric acid of activated coke absorption method desulfurization regeneration gas.
Background technology
All contain SO in power plant, steel plant, the external discharged flue gas in chemical plant at present
2, for eliminating SO
2Pollute, enterprise has adopted different flue gas desulfurization techniques.The activated coke absorption method belongs to the dry flue gas desulphurization technology, and this method discharges 300～350 ℃ through absorption, resolving, contains SO
215%～30%, moisture 30%～35% enriched flue gas.Most enterprises deliver to adjacent sulfuric acid production system with enriched flue gas.Though there is independent acid making system in indivedual enterprises, diluted acid does not fully utilize, and flow process is complicated, and investment is many.
Summary of the invention
The objective of the invention is to the regeneration gas behind external discharged flue gas employing such as power plant, steel plant, the chemical plant active coke desulphurizing, and a kind of active coke desulphurizing regeneration gas process for preparing sulfuric acid that proposes.
Main technical schemes of the present invention: active coke desulphurizing regeneration gas process for preparing sulfuric acid is characterized in that comprising following processing step: from 15%～30% the SO of containing of 300～350 ℃ of seeing off of regeneration blower fan
2Flue gas is cooled to 170～190 ℃ through heat pipe boiler and gets into gas purge system; Get into the two-stage electrostatic precipitator after flue gas process venturi scrubber with internal injection, the foaming tower cooling dedusting and remove acid mist; Flue gas and additional air are mixed into 36～40 ℃ and contain 8%～9%SO after the demist
2Gas gets into drying tower, after 92.5% sulfuric acid drying, boosts to 18～22Kpa by main air blower and gets into conversion system, conversion ratio 96%～97%; Transform back gas and get into absorption system through economizer, sulfuric acid manufactures a finished product; Tail gas is sent flue gas master desulfurizer back to and is further removed SO after absorbing
2, emptying SO
2Be lower than 200mg/m
3
Usually, the diluted acid of cleaning system according to the invention utilizes two diluted acid cooler coolings, and cooled diluted acid recycles.
The diluted acid that comes from the venturi scrubber with internal injection kerve most ofly gets into venturi scrubber with internal injection again after cooling after sedimentation, few partly causing degassing tower deviates from SO in the diluted acid
2After, send into the diluted acid filter, adopt the reverse osmosis membrane filtration technology to carry out pure and impure separation.Clear liquid absorbs the tower acid circulating slot as producing additional water with being pumped to; Turbid liquid add in the lime and after, divide dried uply as water for industrial use, a small amount of waste residue removes the waste residue treatment region; The recyclable fuel of doing of mud that settler is discharged.
Conversion system of the present invention can adopt conventional conversion process of four sections cold shock formulas.
Main technique index of the present invention:
Go into reformed gas:
SO
2：?8％～9％
Acid mist:＜0.005g/m
3
Moisture:＜0.1g/m
3
Dirt:＜0.001g/m
3
Efficient:
Conversion ratio: 96%～97%
Purifying rate:＞99%
Absorptivity:＞99.97%
Emptying tail gas:
SO
2＜200mg/m
3
Technology of the present invention can be produced 20% oleum, 98% acid, 92.5% concentrated sulfuric acid as required, can also further produce 65% oleum, liquid SO as required
3, liquid SO
2Deng product.
Beneficial effect of the present invention:
1) transforming employing one changes a suction, and flow process is simple, reduced investment, and resistance is little.
2) tail gas after the absorption returns flue gas master desulfurizer, adopts active coke desulphurizing, guarantees SO in the emptying tail gas
2,, can reach 200mg/m far below the GB requirement
3(GB is＜400mg/m
3)
3) adopt heat pipe boiler, heat pipe economizer reclaims heat, and heat utilization efficiency is high.
4) produce a large amount of condensed waters in the purification process, after treatment as product supplementing water and water for industrial use, no waste water externally discharges.
5) the activated coke mud that produces in the purification process can return boiler and make fuel, and it is that waste residue is handled that a small amount of neutralization back lime mud is only arranged.
6) product variety can be adjusted according to market demand, also can further develop to produce other chemical products.
Description of drawings
Accompanying drawing 1 is an embodiment of the invention process flow diagram.
Among the figure, the 1-regenerator; The 2-blower fan of regenerating; The 3-heat pipe boiler; The 4-settler; The 5-venturi scrubber with internal injection; 6-Venturi tube kerve; 7-Venturi tube diluted acid circulating slot; 8-Venturi tube diluted acid cooler; 9-foaming tower circulating slot; The 10-foaming tower; 11-foaming tower acid cooler; The 12-electrostatic precipitator; 13-is dry, device is inhaled in a commentaries on classics one; 14-foaming tower diluted acid pump; The 15-degassing tower; 16-diluted acid pump; 17-Venturi tube diluted acid pump; The dirty sour filter of 18-; The clear sour pump of 19-.
The specific embodiment
Below in conjunction with embodiment and accompanying drawing technology of the present invention is described in detail.
Embodiment
In the present embodiment, regeneration tolerance is 10000m per hour behind the active coke desulphurizing
3, SO in its component
217%, CO
210%, H
2O 33%, 300 ℃ of gas temperatures, normal pressure.Can produce 5.8 ten thousand tons in folding 100% sulfuric acid every year.By 450 yuan of sour prices July 98% in 2012, take in 2,600 ten thousand yuan.
Shown in accompanying drawing 1; After regeneration gas boosts to 2KPa by regeneration blower fan 2; Be cooled to 180 ℃ of entering purifiers through heat pipe boiler 3 heat exchange, going out venturi scrubber with internal injection 5 gas temperatures is 75 ℃, goes out foaming tower 10 temperature and is 65 ℃ gas and behind two-stage electrostatic precipitator 12, be mixed into the air of introducing and contain SO
29% 36～40 ℃ gas gets into drying, changes a suction device 13; Be that gas gets into drying tower, dry with 92.5% concentrated sulfuric acid, dry back gas boosts to 20Kpa through main air blower and sends into four sections converters conversions; Transform back gas and send the absorption tower, with 98% sulfuric acid absorption SO
3Generate sulfuric acid; Absorb back tail gas and return the main flue gas desulfurizer, emptying after the desulfurization.SO in the vent gas
2＜200mg/m
3
Said purifier is provided with two platen formula diluted acid coolers; First (joining Venturi tube) Venturi tube diluted acid cooler 8 is cooled to 55～58 ℃ with diluted acid from 82～85 ℃, and second (joining foaming tower) foaming tower acid cooler 11 is cooled to 28～32 ℃ with diluted acid from 55～58 ℃.
After settler 4 sedimentations, most of after cooling off, get into venturi scrubber with internal injection 5 again from the diluted acid of venturi scrubber with internal injection kerve 6, the part diluted acid from venturi scrubber with internal injection diluted acid circulating pump 7 is drawn removes SO in the acid through degassing tower 15
2After, deliver to dirty sour filter 18, behind the employing reverse osmosis membrane filtration technical filter, the turbidity of clear liquid can per hour can be drawn 1.4 tons to absorbing the circulation acid tank as the production supplementing water less than 20mg/l.Turbid liquid adopts the lime neutralization, per hour uses amount of lime 15KG, per hour generates 1.1 tons of water for industrial uses after the neutralization, only has the 24KG waste residue to send factory waste residue to handle.The recyclable fuel of doing of mud that settler 4 is discharged.
In the above-mentioned technology, also comprise and the Venturi tube diluted acid circulating slot 7 of process matching, foaming tower circulating slot 9, foaming tower diluted acid pump 14, diluted acid pump 16, Venturi tube diluted acid pump 17, the clear sour pump of 19-etc.
The main technique index of present embodiment:
Go into reformed gas:
SO
2：?8％～9％
Acid mist:＜0.005g/m
3
Moisture:＜0.1g/m
3
Dirt:＜0.001g/m
3
Efficient:
Conversion ratio: 96%～97%
Purifying rate:＞99%
Absorptivity:＞99.97%
Emptying tail gas:
SO
2＜200mg/m
3?。
Claims (4)
1. active coke desulphurizing regeneration gas process for preparing sulfuric acid is characterized in that comprising following processing step: see off from the regeneration blower fan 300～350 ℃ contain 15%～30% SO
2Flue gas is cooled to 170～190 ℃ through heat pipe boiler and gets into gas purge system; Get into the two-stage electrostatic precipitator after flue gas process venturi scrubber with internal injection, the foaming tower cooling dedusting and remove acid mist; Flue gas and additional air are mixed into 36～40 ℃ and contain 8%～9%SO after the demist
2Gas gets into drying tower, after 92.5% sulfuric acid drying, boosts to 18～22Kpa by main air blower and gets into conversion system, conversion ratio 96%～97%; Transform back gas and get into absorption system through economizer, sulfuric acid manufactures a finished product; Tail gas is sent flue gas master desulfurizer back to and is further removed SO after absorbing
2, emptying SO
2Be lower than 200mg/m
3
2. technology as claimed in claim 1 is characterized in that the diluted acid of cleaning system utilizes two diluted acid cooler coolings, and cooled diluted acid recycles.
3. technology as claimed in claim 1, the diluted acid that it is characterized in that coming from the venturi scrubber with internal injection kerve most ofly get into venturi scrubber with internal injection again after cooling after sedimentation, few partly causing degassing tower deviates from SO in the diluted acid
2After, send into the diluted acid filter, adopt the reverse osmosis membrane filtration technology to carry out pure and impure separation, clear liquid absorbs the tower acid circulating slot as producing additional water with being pumped to; Turbid liquid add in the lime and after, divide dried uply as water for industrial use, a small amount of waste residue removes the waste residue treatment region; The mud that settler is discharged reclaims makes fuel.
4. technology as claimed in claim 1 is characterized in that conversion system adopts conversion process of four sections cold shock formulas.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2012102579490A CN102743956A (en) | 2012-07-25 | 2012-07-25 | Process for preparing sulfuric acid by using regenerative gas obtained from active coke desulphurization |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2012102579490A CN102743956A (en) | 2012-07-25 | 2012-07-25 | Process for preparing sulfuric acid by using regenerative gas obtained from active coke desulphurization |
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|---|---|
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ID=47024659
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104368219A (en) * | 2014-11-07 | 2015-02-25 | 紫金铜业有限公司 | Metallurgical off-gas acid-making tail gas desulfurization and regeneration system |
| CN107469588A (en) * | 2016-06-07 | 2017-12-15 | 上海宝钢化工有限公司 | SO in industrial tail gas can be reduced2The device and its exhaust gas treating method of concentration |
| CN109370622A (en) * | 2018-12-18 | 2019-02-22 | 上海克硫环保科技股份有限公司 | A kind of activated coke dry gas-cleaning system and its technique |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1251965C (en) * | 2002-06-25 | 2006-04-19 | 南化集团研究院 | Preparation of high-concntration surlfuric acid using hydrogen sulfide contained acidic gas |
| CN102350214A (en) * | 2011-06-29 | 2012-02-15 | 山东大学 | Coal-fired power plant coal dust prepared activated coke flue gas comprehensive purification system and technology |
| CN102371108A (en) * | 2010-08-20 | 2012-03-14 | 中国石油化工集团公司 | Method for producing sulfuric acid by oxygen-enriched air incineration of acid gas containing hydrogen sulfide |
-
2012
- 2012-07-25 CN CN2012102579490A patent/CN102743956A/en active Pending
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1251965C (en) * | 2002-06-25 | 2006-04-19 | 南化集团研究院 | Preparation of high-concntration surlfuric acid using hydrogen sulfide contained acidic gas |
| CN102371108A (en) * | 2010-08-20 | 2012-03-14 | 中国石油化工集团公司 | Method for producing sulfuric acid by oxygen-enriched air incineration of acid gas containing hydrogen sulfide |
| CN102350214A (en) * | 2011-06-29 | 2012-02-15 | 山东大学 | Coal-fired power plant coal dust prepared activated coke flue gas comprehensive purification system and technology |
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104368219A (en) * | 2014-11-07 | 2015-02-25 | 紫金铜业有限公司 | Metallurgical off-gas acid-making tail gas desulfurization and regeneration system |
| CN104368219B (en) * | 2014-11-07 | 2016-07-06 | 紫金铜业有限公司 | A kind of metallurgical off-gas acid-making tail gas desulfurization regenerative system |
| CN107469588A (en) * | 2016-06-07 | 2017-12-15 | 上海宝钢化工有限公司 | SO in industrial tail gas can be reduced2The device and its exhaust gas treating method of concentration |
| CN109370622A (en) * | 2018-12-18 | 2019-02-22 | 上海克硫环保科技股份有限公司 | A kind of activated coke dry gas-cleaning system and its technique |
| CN109370622B (en) * | 2018-12-18 | 2023-10-17 | 上海克硫环保科技股份有限公司 | Flue gas purification system and technology by active coke drying method |
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Application publication date: 20121024 |