CN1847460A - Scale eliminating method for casing pre-heater - Google Patents
Scale eliminating method for casing pre-heater Download PDFInfo
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- CN1847460A CN1847460A CN 200510200208 CN200510200208A CN1847460A CN 1847460 A CN1847460 A CN 1847460A CN 200510200208 CN200510200208 CN 200510200208 CN 200510200208 A CN200510200208 A CN 200510200208A CN 1847460 A CN1847460 A CN 1847460A
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- cannula
- sleeve pipe
- scabs
- step sleeve
- cleaning
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Abstract
The present invention discloses scale eliminating method for casing pre-heater, and dilute sulfuric acid solution is used in eliminating scale in casing pre-heater. Dilute sulfuric acid solution is injected from the last stage of casings and exhausted from the first stage until eliminating scales in the last stage of casing completely. The present invention makes it possible to increase the number of casing pre-heaters for replacing autoclave, so as to lower the investment.
Description
Technical field:
The present invention relates in a kind of alumina producing, be used for the purging method that the cannula primary heater of raw pulp preheating scabs, belong to the cannula primary heater technical field.
Background technology:
In alumina producing; when adopting high temperature, high pressure stripping, dissolved mineral slurry produces a large amount of secondary steams after multistage flash evaporation is sent out, and this secondary vapour does not efflux; and be used for the preheating of raw pulp, to reach effectively protection environment and the work safety and the health of producing of energy-conservation, consumption reduction.In the prior art, the method that is used for indirect preheating has following two kinds:
Indirect heating autoclave preheating: though this equipment is a kind of advanced person and the highly effective equipment of realizing high pressure stripping indirect heating; But it has from great and have the transmission whipping appts, heating tube bundle and oiling system etc., and promptly system is comparatively complicated; Bring investment big therefrom, operation easier and Maintenance and Repair, the cleaning work amount that scabs are big, and heat transfer coefficient is lower in addition.
Sleeve preheating: the inner and outer pipe of pipeline preheater all adopts weldless steel tube, and interior pipe is the solution runner, and outer tube is the heating steam runner, compares with autoclave, has the heat transfer coefficient height, and construction investment province, Maintenance and Repair, the cleaning amount is little and advantage such as compact construction; But increase (being that duct length increases) along with pipeline preheating progression, propelling along with working time, scabbing of temperature end can constantly thicken, even adopting treatment process of the prior art handles, scabbing of its high temperature section still can't be handled totally, brings the heat-transfer system number significantly to reduce therefrom, and resistance of ducting loss increases, even cause line clogging, force the operation that production can't continous-stable.So in the prior art, the cannula primary heater pipeline of mechanical stirring indirect heating digestion series has only Pyatyi at most.
Summary of the invention:
The objective of the invention is to: the purging method that provides the cannula primary heater that scabs in a kind of better cannula cleaning to scab, to overcome the deficiencies in the prior art.
The present invention constitutes like this: the purging method that a kind of cannula primary heater scabs, it adopts dilute sulphuric acid cannula cleaning preheater to scab, to be used for the dilute sulphuric acid that the cannula cleaning preheater scabs, at first inject, discharge from first step sleeve pipe and clean by the last step sleeve pipe, wash cycles so repeatedly, up to scabbing in the last step sleeve pipe cleaned up, can finish the cleaning that cannula primary heater is scabbed like this; When in the first step sleeve pipe during also residual scabbing, to be used for the dilute sulphuric acid that the cannula cleaning preheater scabs, inject, discharge from first step sleeve pipe from the last step sleeve pipe, wash cycles so repeatedly, residual scabbing cleans up in first step sleeve pipe, can finish the cleaning that cannula primary heater is scabbed; The pH value of the dilute sulphuric acid that the cannula cleaning preheater scabs is: 3～6.
The present invention has the following advantages: 1, cleaning performance is better, and is particularly better to the treatment effect that scabs of high temperature section;
2, can increase the cannula primary heater quantity that has now in the pressure digestion system, replace autoclave to use, replace the preheating of one-level autoclave with the one-level sleeve pipe and can save about 3,000,000 yuan of construction investment;
3, the Pyatyi cannula primary heater is increased to more than six grades, 1 ton of aluminum oxide of every production can be saved about live steam 0.12t, and an alumina producer of producing 800kt per year can be saved live steam 96kt every year, promptly can save production cost about 7,000,000 yuan every year;
4, adopt head and end to advance acid and clean, alleviated the corrosion of dilute sulphuric acid weldless steel tube.
Description of drawings:
Accompanying drawing 1 is a structural representation of the present invention.
Embodiment:
Embodiments of the invention: the present invention can be in existing technical improvement, when scabbing of cannula primary heater needs to handle, is adopting pH value 3? dilute sulphuric acid clean, to be used for the dilute sulphuric acid that the cannula cleaning preheater scabs, at first inject, discharge from first step sleeve pipe and clean by the last step sleeve pipe, clean 1? hour, up to scabbing in the last step sleeve pipe cleaned up; After above-mentioned cleaning is finished, if also residual scabbing in the first step sleeve pipe, to be used for the dilute sulphuric acid that the cannula cleaning preheater scabs, inject, discharge from first step sleeve pipe from the last step sleeve pipe, wash cycles so repeatedly, residual scabbing cleans up in first step sleeve pipe, can finish the cleaning that cannula primary heater is scabbed like this.
Claims (3)
1. purging method that cannula primary heater scabs, it is characterized in that: it adopts dilute sulphuric acid cannula cleaning preheater to scab, to be used for the dilute sulphuric acid that the cannula cleaning preheater scabs, at first inject, discharge from first step sleeve pipe and clean by the last step sleeve pipe, wash cycles so repeatedly, up to scabbing in the last step sleeve pipe cleaned up, can finish the cleaning that cannula primary heater is scabbed like this.
2. the purging method that cannula primary heater according to claim 1 scabs, it is characterized in that: when in the first step sleeve pipe during also residual scabbing, to be used for the dilute sulphuric acid that the cannula cleaning preheater scabs, inject, discharge from first step sleeve pipe from the last step sleeve pipe, wash cycles so repeatedly, residual scabbing cleans up in first step sleeve pipe, can finish the cleaning that cannula primary heater is scabbed.
3. the purging method that cannula primary heater according to claim 1 and 2 scabs is characterized in that: the pH value of the dilute sulphuric acid that the cannula cleaning preheater scabs is: 3～6.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB2005102002089A CN100436647C (en) | 2005-04-05 | 2005-04-05 | Scale eliminating method for casing pre-heater |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB2005102002089A CN100436647C (en) | 2005-04-05 | 2005-04-05 | Scale eliminating method for casing pre-heater |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN1847460A true CN1847460A (en) | 2006-10-18 |
| CN100436647C CN100436647C (en) | 2008-11-26 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNB2005102002089A Expired - Fee Related CN100436647C (en) | 2005-04-05 | 2005-04-05 | Scale eliminating method for casing pre-heater |
Country Status (1)
| Country | Link |
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| CN (1) | CN100436647C (en) |
Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101608312B (en) * | 2008-06-19 | 2011-04-20 | 中国铝业股份有限公司 | Method for descaling evaporator set used in alumina production by pickling |
| CN102350422A (en) * | 2011-06-21 | 2012-02-15 | 中国铝业股份有限公司 | Method for clearing scabs dissolved out of autoclave |
| CN102553864A (en) * | 2010-12-29 | 2012-07-11 | 中国铝业股份有限公司 | Method for cleaning scab of high pressure dissolution system through water dissolution method |
| CN102755974A (en) * | 2011-04-27 | 2012-10-31 | 贵阳铝镁设计研究院有限公司 | Chemical cleaning and heating device and heating method thereof |
| CN104438243A (en) * | 2014-11-12 | 2015-03-25 | 贵州大学 | Method for removing scars in inner pipes of one-pipe piping preheater |
| CN108160625A (en) * | 2018-01-04 | 2018-06-15 | 山东潍焦集团薛城能源有限公司 | A kind of method of cork dry quenching disposable dust remover water cold sleeve on-line cleaning |
| CN112574828A (en) * | 2020-12-11 | 2021-03-30 | 河南丰达智能装备有限公司 | Formula and preparation method of cleaning agent for material scale dissolved out of pipeline in alumina plant |
| CN114210663A (en) * | 2021-11-19 | 2022-03-22 | 中铝中州铝业有限公司 | Method for cleaning bauxite leaching sleeve |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| SU700774A1 (en) * | 1978-02-20 | 1979-11-30 | Предприятие П/Я А-1297 | Method of removing carbonate crust from surface of heat exchange apparatus |
-
2005
- 2005-04-05 CN CNB2005102002089A patent/CN100436647C/en not_active Expired - Fee Related
Cited By (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101608312B (en) * | 2008-06-19 | 2011-04-20 | 中国铝业股份有限公司 | Method for descaling evaporator set used in alumina production by pickling |
| CN102553864A (en) * | 2010-12-29 | 2012-07-11 | 中国铝业股份有限公司 | Method for cleaning scab of high pressure dissolution system through water dissolution method |
| CN102755974A (en) * | 2011-04-27 | 2012-10-31 | 贵阳铝镁设计研究院有限公司 | Chemical cleaning and heating device and heating method thereof |
| CN102350422A (en) * | 2011-06-21 | 2012-02-15 | 中国铝业股份有限公司 | Method for clearing scabs dissolved out of autoclave |
| CN104438243A (en) * | 2014-11-12 | 2015-03-25 | 贵州大学 | Method for removing scars in inner pipes of one-pipe piping preheater |
| CN104438243B (en) * | 2014-11-12 | 2016-08-31 | 贵州大学 | A kind of method for cleaning of single-sleeve preheating device inner tube scab |
| CN108160625A (en) * | 2018-01-04 | 2018-06-15 | 山东潍焦集团薛城能源有限公司 | A kind of method of cork dry quenching disposable dust remover water cold sleeve on-line cleaning |
| CN112574828A (en) * | 2020-12-11 | 2021-03-30 | 河南丰达智能装备有限公司 | Formula and preparation method of cleaning agent for material scale dissolved out of pipeline in alumina plant |
| CN114210663A (en) * | 2021-11-19 | 2022-03-22 | 中铝中州铝业有限公司 | Method for cleaning bauxite leaching sleeve |
Also Published As
| Publication number | Publication date |
|---|---|
| CN100436647C (en) | 2008-11-26 |
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Owner name: GUIYANG ALUMINIUM AND MAGNESIUM DESIGN INSTITUTE C Free format text: FORMER OWNER: GUIYANG ALUMINIUM AND MAGNESIUM DESIGN INST. Effective date: 20110523 |
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Free format text: CORRECT: ADDRESS; FROM: 550004 NO. 208, BEIJING ROAD, GUIYANG CITY, GUIZHOU PROVINCE TO: 550081 NO.2, JINZHU ROAD, JINYANG NEW DISTRICT, GUIYANG CITY, GUIZHOU PROVINCE |
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| TR01 | Transfer of patent right |
Effective date of registration: 20110523 Address after: 550081 Guiyang Province, Jinyang New District, Zhu Zhu Road, No. 2 Patentee after: Guiyang Aluminum & Magnesium Design Institute Co., Ltd. Address before: 550004 No. 208, Beijing Road, Guiyang, Guizhou Patentee before: Guiyang Aluminium and Magnesium Design Inst. |
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| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20081126 Termination date: 20150405 |
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| EXPY | Termination of patent right or utility model |