CN1286148A - Method for cleaning large sulfuric acid storage tank - Google Patents
Method for cleaning large sulfuric acid storage tank Download PDFInfo
- Publication number
- CN1286148A CN1286148A CN 99115546 CN99115546A CN1286148A CN 1286148 A CN1286148 A CN 1286148A CN 99115546 CN99115546 CN 99115546 CN 99115546 A CN99115546 A CN 99115546A CN 1286148 A CN1286148 A CN 1286148A
- Authority
- CN
- China
- Prior art keywords
- storage tank
- sulfuric acid
- coal ash
- acid
- concentration
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
- QAOWNCQODCNURD-UHFFFAOYSA-N Sulfuric acid Chemical compound OS(O)(=O)=O QAOWNCQODCNURD-UHFFFAOYSA-N 0.000 title claims abstract description 64
- 238000004140 cleaning Methods 0.000 title claims abstract description 14
- 238000000034 method Methods 0.000 title claims abstract description 13
- 239000002253 acid Substances 0.000 claims abstract description 18
- 239000010883 coal ash Substances 0.000 claims abstract description 14
- 239000003513 alkali Substances 0.000 claims abstract description 4
- 239000011505 plaster Substances 0.000 claims abstract description 4
- 239000004576 sand Substances 0.000 claims description 9
- 239000002023 wood Substances 0.000 claims description 5
- 239000003518 caustics Substances 0.000 claims description 3
- 238000010790 dilution Methods 0.000 claims description 3
- 239000012895 dilution Substances 0.000 claims description 3
- 239000000243 solution Substances 0.000 claims description 3
- 239000010802 sludge Substances 0.000 abstract 1
- 239000002699 waste material Substances 0.000 abstract 1
- 238000006386 neutralization reaction Methods 0.000 description 7
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 6
- 235000008733 Citrus aurantifolia Nutrition 0.000 description 5
- 235000011941 Tilia x europaea Nutrition 0.000 description 5
- 239000004571 lime Substances 0.000 description 5
- 239000000463 material Substances 0.000 description 5
- 239000007789 gas Substances 0.000 description 4
- 239000003595 mist Substances 0.000 description 3
- 238000002485 combustion reaction Methods 0.000 description 2
- 238000005260 corrosion Methods 0.000 description 2
- 230000007797 corrosion Effects 0.000 description 2
- 239000000203 mixture Substances 0.000 description 2
- 238000011084 recovery Methods 0.000 description 2
- QAOWNCQODCNURD-UHFFFAOYSA-L Sulfate Chemical compound [O-]S([O-])(=O)=O QAOWNCQODCNURD-UHFFFAOYSA-L 0.000 description 1
- 230000002378 acidificating effect Effects 0.000 description 1
- OSGAYBCDTDRGGQ-UHFFFAOYSA-L calcium sulfate Chemical compound [Ca+2].[O-]S([O-])(=O)=O OSGAYBCDTDRGGQ-UHFFFAOYSA-L 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 238000007865 diluting Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000004299 exfoliation Methods 0.000 description 1
- 239000002737 fuel gas Substances 0.000 description 1
- 238000010297 mechanical methods and process Methods 0.000 description 1
- 230000005226 mechanical processes and functions Effects 0.000 description 1
- 230000007935 neutral effect Effects 0.000 description 1
- 238000004064 recycling Methods 0.000 description 1
- 239000002689 soil Substances 0.000 description 1
- 239000002351 wastewater Substances 0.000 description 1
Landscapes
- Cleaning In General (AREA)
- Processing Of Solid Wastes (AREA)
- Cleaning By Liquid Or Steam (AREA)
Abstract
The invention relates to a method for cleaning a large-scale sulfuric acid storage tank, which is characterized in that low-concentration sulfuric acid (relative to the sulfuric acid in the storage tank to be cleaned) is poured into the storage tank and fully mixed to absorb acid gas in the space in the storage tank, then diluted sulfuric acid is emptied, coal ash is poured into the storage tank to solidify the coal ash and acid sludge, after the acid gas in the tank is dissipated and ventilated, plaster is removed, and then waste alkali solution is added for alkali cleaning. The invention is suitable for cleaning small sulfuric acid storage tanks and large sulfuric acid storage tanks.
Description
The present invention relates to the method that a kind of large-scale sulfuric acid storage tank cleans.
The method of neutralization is generally adopted in the cleaning of sulfuric acid storage tank, after storage tank is turned, reclaimed bed material, lime is poured in the storage tank, with acid sulfate soil generation neutralization reaction residual at the bottom of the jar, generates neutral calcium sulfate salt and water.After treating that water vapour and acid mist dissipate, organize the operating personnel to enter in the storage tank removing and mud, clear jar of program routinely carried out again.In N-process, the ratio of sour mud and lime is 1: 1.
In actual mechanical process, it is very dangerous pouring large quantities of lime into storage tank, violent neutralization reaction takes place in the sour mud in lime and the storage tank, and discharge a large amount of heat of neutralization, the water that reaction generates seethes with excitement in storage tank, and carrying acid secretly and drip and to splash, storage tank produces the high vibration and the strong sound, and exfoliation corrosion takes place simultaneously.Entire field is being shrouded by water vapour and acid mist, and rugged environment causes the operating personnel can't carry out the work of next program.The neutralisation treatment process cycle long (the 600M3 storage tank needs 3 time-of-weeks).Also only be adapted to small-sized sulfuric acid storage tank (volume≤1000M
3) cleaning.
Owing to taked method of the present invention, satisfied operating environment requirement and security basically, both adapted to small-sized sulfuric acid storage tank, also be adapted to large-scale sulfuric acid storage tank (＞1000M
3) cleaning.
The method that the object of the present invention is to provide a kind of large-scale sulfuric acid storage tank to clean.
The present invention is achieved in that at sulfuric acid storage tank and turns, after having reclaimed bed material, with low-concentration sulfuric acid (concentration is lower than 5～10% of sulfuric acid concentration in the storage tank to be cleaned, consumption be the storage tank inner acid mud 100%) pour storage tank into and fully mix, to absorb the acid gas in space in the storage tank.Then, with turned letter of the sulfuric acid after the dilution and recovery bed material.Again coal ash (is answered the coal ash of completing combustion, sieved with 3 * 3 sieve apertures, and fully dry.Coal ash: sour mud=0.5: 1) evenly pour in the storage tank, coal ash and sour mud are solidified, after treating that a jar interior acid gas dissipation is ventilated, organize the operating personnel evenly to spill fine sand and wood chip (fine sand should sieve in the shop, and fully dry, fine sand consumption: fine sand: wood chip: sour mud=0.25: 0.25: 1), enter jar interior plaster of removing.Then, add spent caustic solution (concentration is 10～15%) and carry out alkali cleaning.Clear jar of program routinely carried out again.
Good effect of the present invention is in the sulfuric acid storage tank cleaning process, can not cause on-the-spot water vapour and acid mist to shroud, (the 2000M that shortened the cleaning frequency
3Storage tank needs 2 time-of-weeks), can not cause storage tank judder and corrosion; Simultaneously, this method does not need to use the lime neutralization, and acid gas and residual sulfuric acid in the recycling can improve the rate of recovery 30～50% as far as possible, both have been fit to small-sized sulfuric acid storage tank (≤1000M
3), also be adapted to large-scale sulfuric acid storage tank (＞1000M
3) cleaning.
Embodiment 1:
1. turn at sulfuric acid storage tank, after having reclaimed bed material, (concentration is lower than sulfuric acid concentration 10% in the storage tank to be cleaned with low-concentration sulfuric acid, consumption be the storage tank inner acid mud 100%), directly be discharged into storage tank from unloading platform, and fully mix, absorb the acid gas in space in the storage tank, then, the sulfuric acid after will diluting is again turned with feeding engine, reclaims bed material again with interim pump.
2. open all hand-holes of storage tank, coal ash (is answered the coal ash of completing combustion, sieved with 3 * 3 sieve apertures, and fully dry.Coal ash: sour mud=0.5: 1) evenly pour in the storage tank qualified back (O to be analyzed into
2＞18%.SO
2≤ 15mg/M
3, H
2S≤10mg/M
3, fuel gas≤0.2%), organize the operating personnel to remove plaster.When dredging, the people is outside jar, shovel digs near the lot of bottom hand-hole earlier, and then evenly the shop is spilt fine sand and wood chip (fine sand should be sieved, and fully dry consumption: fine sand: wood chip: sour mud=0.25: 0.25: 1), advance jar behind operating personnel's whole body protection again, advance to whole storage tank so one by one, up to sour mud full scale clearance.
3. transport spent caustic solution with tank car, add clear water dilution (concentration is 10%, and consumption is a tank volume 10%).Around reservoir walls, wash from manhole with interim pump and interim pipeline, then, acidic and alkaline waste water is entered neutralization pond.A clear routinely again jar program is carried out.
Claims (2)
1, a kind of method of large-scale sulfuric acid storage tank cleaning, it is characterized in that pouring low-concentration sulfuric acid into storage tank and fully mixing, to absorb the acid gas in space in the storage tank, then, with the turned letter of the sulfuric acid after the dilution, evenly pour into coal ash in the storage tank again, coal ash and sour mud are solidified, after treating that a jar interior acid gas dissipation is ventilated, remove plaster, add spent caustic solution then and carry out alkali cleaning.
2, the method for a kind of large-scale sulfuric acid storage tank cleaning according to claim 1, it is characterized in that absorbing acid gas and should be lower than 5～10% of the interior sulfuric acid concentration of storage tank to be cleaned with low-concentration sulfuric acid concentration, the coal ash that acid mud solidifies usefulness should be the coal ash completely that burns, sieve with 3 * 3 sieve apertures, and fully dry, coal ash: sour mud=fine sand should sieve and fully dry fine sand in 0.5: 1: wood chip: sour mud=0.25: 0.25: 1.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 99115546 CN1286148A (en) | 1999-08-30 | 1999-08-30 | Method for cleaning large sulfuric acid storage tank |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 99115546 CN1286148A (en) | 1999-08-30 | 1999-08-30 | Method for cleaning large sulfuric acid storage tank |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN1286148A true CN1286148A (en) | 2001-03-07 |
Family
ID=5278488
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 99115546 Pending CN1286148A (en) | 1999-08-30 | 1999-08-30 | Method for cleaning large sulfuric acid storage tank |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN1286148A (en) |
-
1999
- 1999-08-30 CN CN 99115546 patent/CN1286148A/en active Pending
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| C06 | Publication | ||
| PB01 | Publication | ||
| ASS | Succession or assignment of patent right |
Owner name: BALIN BRANCH CORP. SINOPEC Free format text: FORMER OWNER: YINGSHAN PETRO-CHEMICAL PLANT, BALING PETRO-CHEMICAL CO. Effective date: 20020622 |
|
| C41 | Transfer of patent application or patent right or utility model | ||
| TA01 | Transfer of patent application right |
Effective date of registration: 20020622 Address after: 414003 No. 1 Dongting Road, Hunan, Yueyang Applicant after: Baling Branch, China Petro-Chemical Co., Ltd. Address before: 414003 Hunan province Yueyang Yingshan Petrochemical Factory Applicant before: Yingshan Petro-Chemical Plant, Baling Petro-chemical Group Co. |
|
| C02 | Deemed withdrawal of patent application after publication (patent law 2001) | ||
| WD01 | Invention patent application deemed withdrawn after publication |