CN104480483A - Cleaning method for scabs of inner wall of outer pipe of single-casing-pipe preheater - Google Patents
Cleaning method for scabs of inner wall of outer pipe of single-casing-pipe preheater Download PDFInfo
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- CN104480483A CN104480483A CN201410634112.2A CN201410634112A CN104480483A CN 104480483 A CN104480483 A CN 104480483A CN 201410634112 A CN201410634112 A CN 201410634112A CN 104480483 A CN104480483 A CN 104480483A
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- outer tube
- cleaning
- preheating device
- pipe
- outer pipe
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- Cleaning And De-Greasing Of Metallic Materials By Chemical Methods (AREA)
- Cleaning In General (AREA)
- Cleaning By Liquid Or Steam (AREA)
Abstract
The invention discloses a cleaning method for scabs of an inner wall of an outer pipe of a single-casing-pipe preheater; the inner wall of the outer pipe of the single-casing-pipe preheater in an alumina production process is subjected to scab cleaning, a circulation mother liquor with the temperature of not less than 80 DEG C in the alumina production process is used as an alkali liquor and is filled in the outer pipe of the single-casing-pipe preheater, the alkali liquor is allowed to soak the inner wall of the outer pipe for 1-2 hours, then a circulating pump is communicated with the outer pipe of the single-casing-pipe preheater through a pipeline, the circulating pump is started up, the alkali liquor is allowed to circularly flow for 20-30 minutes in the outer pipe, then the circulating pump is stopped, and thus a cleaning process is completed; after the cleaning process is repeated for 2-5 times, the alkali liquor in the outer pipe is totally discharged, and thus the scab cleaning work of the inner wall of the outer pipe of the single-casing-pipe preheater is completed. The method has the advantages of clean scab cleaning and no generation of corrosion or damage to the outer pipe, and also has the advantages of simple operation, convenient use, low use cost and the like.
Description
Technical field
the present invention relates to the method for cleaning that a kind of single-sleeve preheating device outer tube wall scabs, belong to the cleaning technique field of alumina producing single-sleeve preheating device outer tube.
Background technology
single-sleeve preheating-autoclave indirect heating dissolving-out technology belongs to one of modern technique of China's alumina producing industry, and device aluminum oxide production capacity used is large, but in production process, scabbing of producing in pipe in single-sleeve preheating device is inevitable.Due in process of production, single-sleeve preheating device does not have stand-by facilities, all will be arranged in scheduled overhaul process at every turn and clear up.The inner and outer pipe of single-sleeve preheating device all adopts weldless steel tube, and interior pipe is slurry channel, and outer tube is vapour passage.In process of production, the inwall of outer tube often produces the phenomenon that scabs, thus affects the use of whole equipment.Therefore need often to clear up scabbing of producing of its outer tube wall.In the prior art, when cleaning outer tube wall scabs, the acid wash often adopting by reference single sleeve pipe inner tube scab is cleared up.Adopt acid wash to carry out cleaning outer tube, not only also existing scabs can not get the problem of thoroughly cleaning, but also also there is a big difference to there is the single cannula exit temperature distance production requirement after cleaning outer tube, does not reach design requirements and carries the needs of product.Therefore the manner of cleaning up that scabs of existing single-sleeve preheating device outer tube wall or not ideal enough, can not meet the needs of production and application.
Summary of the invention
the object of the invention is to, provide a kind of simple to operate, easy to use, cleaning to scab the method for cleaning that single-sleeve preheating device outer tube wall that is clean and that can not produce corrosion or infringement to outer tube scab, to overcome the deficiencies in the prior art.
technical scheme of the present invention is achieved in that
the method for cleaning that a kind of single-sleeve preheating device outer tube wall of the present invention scabs is, in to aluminum oxide production process the outer tube wall of single-sleeve preheating device scab cleaning time, the circulating mother liquor adopting temperature in aluminum oxide production process to be not less than 80 DEG C fills as alkali lye in the outer tube of single-sleeve preheating device, make this dipping by lye outer tube wall after 1 ~ 2 hour, then recycle pump is communicated with by the outer tube of pipeline with single-sleeve preheating device, start recycle pump, after making alkali lye circulate 20 ~ 30 minutes within the outer tube, stop recycle pump and complete a cleaning process; And then make dipping by lye outer tube wall after 1 ~ 2 hour, restart recycle pump, after making alkali lye circulate 20 ~ 30 minutes within the outer tube, then stop recycle pump and complete another cleaning process; So repeatedly after 2 ~ 5 cleaning processes, after the alkali lye in outer tube is all discharged, can complete and the outer tube wall of single-sleeve preheating device is scabbed cleaning work.
carrying out in cleaning process, when the alkali liquid temperature be circulated throughout by recycle pump is lower than 65 DEG C, after emitting the alkali lye of 1/5 ~ 1/2, then supplementing the circulating mother liquor that new temperature is not less than 80 DEG C and fill in the outer tube of single-sleeve preheating device as alkali lye.
owing to have employed technique scheme, the present invention effectively overcomes the unfavorable factor of existing employing acid washing method cleaning outer tube, the present inventor through observing, research and analysis find, outer tube scabs mainly because flash distillation band material seriously causes, and its main component scabbed is Al
2
o
3
h
2
o, if with reference to the acid wash of single sleeve pipe inner tube scab, can by the control of inhibiter working lipe, its scavenging period is short, and scabbing in outer tube can not get thorough cleaning, and therefore its cleaning effect is very poor, adopt acid wash cleaning outer tube simultaneously, also there is the etching problem of acid to process pipe.And the present invention has abandoned traditional acid wash completely, the circulating mother liquor adopting temperature in production technique to be not less than 80 DEG C is cleared up outer tube as alkali lye, and by the mode of immersion, wash cycles, outer tube wall is cleared up, effectively overcome problem existing in prior art.So the present invention compared with prior art, not only there is the advantage that cleaning scabs totally, can not produce corrosion or infringement to outer tube, but also have the advantages such as simple to operate, easy to use, use cost is low.
Embodiment
below in conjunction with embodiment, the present invention is described in further detail, but not as any limitation of the invention.
embodiments of the invention:
the method for cleaning that a kind of single-sleeve preheating device outer tube wall of the present invention scabs can be directly used in and carry out cleaning enforcement to the outer tube of the single-sleeve preheating device used in existing single-sleeve preheating-autoclave indirect heating dissolving-out process, when clearing up scabbing in single-sleeve preheating device outer tube wall used in aluminum oxide production process, the circulating mother liquor adopting temperature in aluminum oxide production process to be not less than 80 DEG C fills as alkali lye in the outer tube of single-sleeve preheating device, make this dipping by lye outer tube wall after 1 ~ 2 hour, then recycle pump is communicated with by the outer tube of pipeline with single-sleeve preheating device, start recycle pump, after making alkali lye circulate 20 ~ 30 minutes within the outer tube, stop recycle pump and complete a cleaning process, and then make dipping by lye outer tube wall after 1 ~ 2 hour, restart recycle pump, after making alkali lye circulate 20 ~ 30 minutes within the outer tube, then stop recycle pump and complete another cleaning process, carrying out in cleaning process, when the alkali liquid temperature be circulated throughout by recycle pump is lower than 65 DEG C, 1/5 ~ 1/2 can be emitted by the alkali lye that recycle pump is circulated throughout according to the situation of cleaning, and then supplement circulating mother liquor that new temperature is not less than 80 DEG C fills the outer tube bore of single-sleeve preheating device as alkali lye after and carry out cleaning process again, so repeatedly after 2 ~ 5 cleaning processes, after the alkali lye in outer tube is all discharged, can complete and the outer tube wall of single-sleeve preheating device is scabbed cleaning work.
Claims (2)
1. the method for cleaning that scabs of a single-sleeve preheating device outer tube wall, it is characterized in that: in aluminum oxide production process the outer tube wall of single-sleeve preheating device scab cleaning time, the circulating mother liquor adopting temperature in aluminum oxide production process to be not less than 80 DEG C fills as alkali lye in the outer tube of single-sleeve preheating device, make this dipping by lye outer tube wall after 1 ~ 2 hour, then recycle pump is communicated with by the outer tube of pipeline with single-sleeve preheating device, start recycle pump, after making alkali lye circulate 20 ~ 30 minutes within the outer tube, stop recycle pump and complete a cleaning process; And then make dipping by lye outer tube wall after 1 ~ 2 hour, restart recycle pump, after making alkali lye circulate 20 ~ 30 minutes within the outer tube, then stop recycle pump and complete another cleaning process; So repeatedly after 2 ~ 5 cleaning processes, after the alkali lye in outer tube is all discharged, can complete and the outer tube wall of single-sleeve preheating device is scabbed cleaning work.
2. the method for cleaning that scabs of single-sleeve preheating device outer tube wall according to claim 1, it is characterized in that: carrying out in cleaning process, when the alkali liquid temperature be circulated throughout by recycle pump is lower than 65 DEG C, after emitting the alkali lye of 1/5 ~ 1/2, then supplement the circulating mother liquor that new temperature is not less than 80 DEG C and fill in the outer tube of single-sleeve preheating device as alkali lye.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410634112.2A CN104480483A (en) | 2014-11-12 | 2014-11-12 | Cleaning method for scabs of inner wall of outer pipe of single-casing-pipe preheater |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410634112.2A CN104480483A (en) | 2014-11-12 | 2014-11-12 | Cleaning method for scabs of inner wall of outer pipe of single-casing-pipe preheater |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN104480483A true CN104480483A (en) | 2015-04-01 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201410634112.2A Pending CN104480483A (en) | 2014-11-12 | 2014-11-12 | Cleaning method for scabs of inner wall of outer pipe of single-casing-pipe preheater |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN104480483A (en) |
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2014
- 2014-11-12 CN CN201410634112.2A patent/CN104480483A/en active Pending
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| PB01 | Publication | ||
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| RJ01 | Rejection of invention patent application after publication | ||
| RJ01 | Rejection of invention patent application after publication |
Application publication date: 20150401 |