CN106989633A - A kind of cleaning method of raw gas heat exchange heat exchanger used - Google Patents
A kind of cleaning method of raw gas heat exchange heat exchanger used Download PDFInfo
- Publication number
- CN106989633A CN106989633A CN201710376408.2A CN201710376408A CN106989633A CN 106989633 A CN106989633 A CN 106989633A CN 201710376408 A CN201710376408 A CN 201710376408A CN 106989633 A CN106989633 A CN 106989633A
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- Prior art keywords
- heat exchanger
- cleaning
- liquid bath
- soak
- heat exchange
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Classifications
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F28—HEAT EXCHANGE IN GENERAL
- F28G—CLEANING OF INTERNAL OR EXTERNAL SURFACES OF HEAT-EXCHANGE OR HEAT-TRANSFER CONDUITS, e.g. WATER TUBES OR BOILERS
- F28G9/00—Cleaning by flushing or washing, e.g. with chemical solvents
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- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Cleaning By Liquid Or Steam (AREA)
- Cleaning In General (AREA)
Abstract
The invention discloses a kind of cleaning method of raw gas heat exchange heat exchanger used, the cleaning method chemicals is simple and easy to get, and cleaning process is simple to operate, corrosivity is small, heat exchanger surface corrosion and scaling deposit removal efficiency is high, and does not need disassembly, cleaning, suitable for industrial popularization and application.
Description
Technical field
The invention belongs to chemical industry equipment cleaning field, and in particular to a kind of to raw gas made from static bed coal gasification technique
Carry out the cleaning method of heat exchanger used in cooling heat transferring.
Background technology
Static bed coal gasification technique is compared with air flow bed, coal gasification of fluidized bed, due to vapor pressure, temperature（Pressure：
0-4MPa;Temperature：800-1200℃）Relatively low, gas-solid countercurrent flow, coal is long in residing time in furnace, therefore gasification gained rough coal
In gas, containing impurity such as many dust, tar, washing the impurity in these coal gas not only makes its wastewater treatment process complicated, and
And often due to washing is not thorough, a small amount of impurity easily brings follow-up producing process into, and the chemical industry such as follow-up heat exchanger, reactor are given birth to
Production equipment progressively results in blockage, and influences whole chemical plant installations produce load.
Traditional cleaning method to blocking heat exchanger, is by heat exchanger core pulling, first to being attached to heat exchanger tube and shell
Internal dust, tar carry out manual cleaning, and then tube bank and housing are cleaned with giant again.This cleaning method
One is to waste time and energy, and two be not thorough to being attached to interbank tar cleaning.
The content of the invention
To overcome the deficiencies in the prior art, the present invention provides a kind of cleaning method of raw gas heat exchange heat exchanger used, should
Cleaning method does not need disassembly, cleaning, and simple to operate, and scavenging period is short, and cleaning performance is good.
The purpose of the present invention is achieved through the following technical solutions：
A kind of cleaning method of raw gas heat exchange heat exchanger used, is comprised the following steps：
（1）Connection cleaning liquid bath and circulating pump on heat exchanger to be washed are being shut down, the circulation cleaning system of closing is formed；
（2）Soak is added to cleaning liquid bath, open the circulation pump squeezes into soak to heat exchanger, when soak is through heat exchange
Device is simultaneously back to termination of pumping when cleaning liquid bath, carries out static soak 36 hours, then drains soak；The soak be toluene and
The light oil and pump of xylene content >=84%, the light oil and pump press 6:4 mass ratio is prepared；
（3）Corrosion coupon is hung in cleaning liquid bath, is added water into cleaning liquid bath, circulating pump is opened and sets up water circulation, to cleaning fluid
Alkali, bleeding agent, surfactant formation cleaning fluid are added in groove, liquid in liquid bath will be cleaned by being passed through 0.5MPa, 200 DEG C of low-pressure steams
Body is warming up to 85-90 DEG C, and continuous circulation drains cleaning fluid after 8 hours；
（4）Clear water, open cycle pump, through repeatedly changing residual liquid in clear water flushing heat exchanging device, regulation are added in cleaning liquid bath
Then pH value is discharged to neutrality；
（5）End socket on heat exchanger is dismantled, the middle pressure asbestos board that thickness is 3mm is installed additional on its flange, then by heat exchanger
Lower inlet accesses 0.6MPa air with pressure, carries out pressurising, until the asbestos board on heat exchanger top bursts suddenly.
Further, the step step（3）Middle bleeding agent is AEO, and surfactant is dodecane
Base sodium sulfonate.
Further, the corrosion coupon is I type stainless steel test piece.
Further, the step step（3）The concentration of alkali is that 8.0%, osmotic agent concentration is 0.2%, surface in cleaning fluid
Surfactant concentration is 0.1%.
Further, the step step（3）Middle alkali is caustic soda, soda ash, the mixture of tertiary sodium phosphate, wherein in cleaning fluid
In, the concentration of caustic soda is 3%, and the concentration of soda ash is 3%, and the concentration of tertiary sodium phosphate is 2%.
The beneficial effects of the invention are as follows：Being soaked by soak can become dust in heat exchanger, the dirty layer of coal tar formation
Pine, there is slight crack；The grease of remaining can be dissolved by alkali, bleeding agent, surfactant, will be fluffed after immersion, slight crack occur
Dirty layer carries out infiltration stripping；The dirt come off can will be peeled off by water flushing after alkali cleaning all go out equipment；By airblasting,
By the change of air instantaneous pressure, flow velocity, the dirty thing remained on tube wall can be all taken out of heat exchanger, most heat exchanger at last
Thorough cleaning is clean.
The heat exchanger cleaning method of the present invention, chemicals is simple and easy to get, and cleaning process is simple to operate, and corrosivity is small, changes
Hot device surface corrosion, scale deposit removal efficiency are high, and do not need disassembly, cleaning, suitable for industrial popularization and application.
Embodiment
Below in conjunction with embodiments of the invention, the technical scheme in the embodiment of the present invention is clearly and completely retouched
State, it is clear that described embodiment is only a part of embodiment of the invention, rather than whole embodiments.Based on the present invention
In embodiment, the every other implementation that those of ordinary skill in the art are obtained under the premise of creative work is not made
Example, belongs to the scope of protection of the invention.
A kind of cleaning method of raw gas heat exchange heat exchanger used, is comprised the following steps：
（1）Connection cleaning liquid bath and circulating pump on heat exchanger to be washed are being shut down, the circulation cleaning system of closing is formed；
（2）Soak is added to cleaning liquid bath, open the circulation pump squeezes into soak to heat exchanger, when soak is through heat exchange
Device is simultaneously back to termination of pumping when cleaning liquid bath, carries out static soak 36 hours, then drains soak；The soak be toluene and
The light oil and pump of xylene content >=84%, the light oil and pump press 6:4 mass ratio is prepared；
（3）I type corrosion coupon is hung in cleaning liquid bath, is added water into cleaning liquid bath, circulating pump is opened and sets up water circulation, to cleaning
Caustic soda, soda ash, tertiary sodium phosphate, AEO, dodecyl sodium sulfate formation cleaning fluid are added in liquid bath, is passed through
0.5MPa, 200 DEG C of low-pressure steams make liquid in cleaning liquid bath be warming up to 85-90 DEG C, and continuous circulation drains cleaning fluid after 8 hours；
（4）Clear water, open cycle pump, through repeatedly changing residual liquid in clear water flushing heat exchanging device, regulation are added in cleaning liquid bath
Then pH value is discharged to neutrality；
（5）End socket on heat exchanger is dismantled, the middle pressure asbestos board that thickness is 3mm is installed additional on its flange, then by heat exchanger
Lower inlet accesses 0.6MPa air, carries out pressurising, until the asbestos board on heat exchanger top bursts suddenly.
Heat exchanger descaling rate through over cleaning is up to 98%, rate of corrosion 0.1mg/ (㎡ h), much smaller than international Corrosion standards.
The foregoing is only a specific embodiment of the invention, but protection scope of the present invention is not limited thereto, any
The change or replacement expected without creative work, should all be included within the scope of the present invention.
Claims (5)
1. a kind of cleaning method of raw gas heat exchange heat exchanger used, it is characterised in that specifically comprise the following steps：
（1）Connection cleaning liquid bath and circulating pump on heat exchanger to be washed are being shut down, the circulation cleaning system of closing is formed；
（2）Soak is added to cleaning liquid bath, open the circulation pump squeezes into soak to heat exchanger, when soak is through heat exchange
Device is simultaneously back to termination of pumping when cleaning liquid bath, carries out static soak 36 hours, then drains soak；The soak be toluene and
The light oil and pump of xylene content >=84%, the light oil and pump press 6:4 mass ratio is prepared；
（3）Corrosion coupon is hung in cleaning liquid bath, is added water into cleaning liquid bath, circulating pump is opened and sets up water circulation, to cleaning fluid
Alkali, bleeding agent, surfactant formation cleaning fluid are added in groove, liquid in liquid bath will be cleaned by being passed through 0.5MPa, 200 DEG C of low-pressure steams
Body is warming up to 85-90 DEG C, and continuous circulation drains cleaning fluid after 8 hours；
（4）Clear water, open cycle pump, through repeatedly changing residual liquid in clear water flushing heat exchanging device, regulation are added in cleaning liquid bath
Then pH value is discharged to neutrality；
（5）End socket on heat exchanger is dismantled, the middle pressure asbestos board that thickness is 3mm is installed additional on its flange, then by heat exchanger
Lower inlet accesses 0.6MPa air with pressure, carries out pressurising, until the asbestos board on heat exchanger top bursts suddenly.
2. a kind of cleaning method of raw gas heat exchange heat exchanger used according to claim 1, it is characterised in that the step
Rapid step（3）Middle bleeding agent is AEO, and surfactant is dodecyl sodium sulfate.
3. a kind of cleaning method of raw gas heat exchange heat exchanger used according to claim 1, it is characterised in that the step
Rapid step（3）Middle corrosion coupon is I type stainless steel test piece.
4. a kind of cleaning method of raw gas heat exchange heat exchanger used according to claim 1, it is characterised in that the step
Rapid step（3）The concentration of alkali is that 8.0%, osmotic agent concentration is that 0.2%, surfactant concentration is 0.1% in cleaning fluid.
5. a kind of cleaning method of raw gas heat exchange heat exchanger used according to claim 1, it is characterised in that the step
Rapid step（3）Middle alkali is caustic soda, soda ash, the mixture of tertiary sodium phosphate, wherein in cleaning fluid, the concentration of caustic soda is 3%, soda ash
Concentration be 3%, the concentration of tertiary sodium phosphate is 2%.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710376408.2A CN106989633B (en) | 2017-05-25 | 2017-05-25 | Cleaning method of heat exchanger for crude gas heat exchange |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710376408.2A CN106989633B (en) | 2017-05-25 | 2017-05-25 | Cleaning method of heat exchanger for crude gas heat exchange |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN106989633A true CN106989633A (en) | 2017-07-28 |
| CN106989633B CN106989633B (en) | 2021-06-01 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201710376408.2A Active CN106989633B (en) | 2017-05-25 | 2017-05-25 | Cleaning method of heat exchanger for crude gas heat exchange |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113251851A (en) * | 2021-04-06 | 2021-08-13 | 山东中实易通集团有限公司 | Cleaning agent for cleaning blockage (ammonium sulfate) of air preheater of coal-fired power plant and preparation and application thereof |
| CN114433551A (en) * | 2022-02-09 | 2022-05-06 | 广东韶钢松山股份有限公司 | Dirt cleaning method for fan |
Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH07186048A (en) * | 1993-12-28 | 1995-07-25 | Toray Ind Inc | Method and apparatus for washing filament yarn transfer roll |
| CN101555441A (en) * | 2008-04-09 | 2009-10-14 | 中国神华能源股份有限公司 | Cleaning agent and cleaning process of GGH heat exchange component |
| KR20110096603A (en) * | 2010-02-18 | 2011-08-31 | 주식회사 기스코 | The dry cleaning method of heat exchanger by dry ice |
| CN102242028A (en) * | 2011-05-20 | 2011-11-16 | 浙江浙能能源技术有限公司 | Neutral detergent and application of neutral detergent in cleaning hard scale of gas-gas heater (GGH) |
| CN202860937U (en) * | 2012-08-31 | 2013-04-10 | 山东龙力生物科技股份有限公司 | Micro-explosion type water pipeline scaling apparatus |
| CN104233329A (en) * | 2014-09-15 | 2014-12-24 | 河北省科学院能源研究所 | Chemical cleaning method of heat exchanger |
| CN106221965A (en) * | 2016-07-26 | 2016-12-14 | 安阳师范学院 | A kind of for gas/gas heat exchanger of wet desulphurization dirty abluent |
-
2017
- 2017-05-25 CN CN201710376408.2A patent/CN106989633B/en active Active
Patent Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH07186048A (en) * | 1993-12-28 | 1995-07-25 | Toray Ind Inc | Method and apparatus for washing filament yarn transfer roll |
| CN101555441A (en) * | 2008-04-09 | 2009-10-14 | 中国神华能源股份有限公司 | Cleaning agent and cleaning process of GGH heat exchange component |
| KR20110096603A (en) * | 2010-02-18 | 2011-08-31 | 주식회사 기스코 | The dry cleaning method of heat exchanger by dry ice |
| CN102242028A (en) * | 2011-05-20 | 2011-11-16 | 浙江浙能能源技术有限公司 | Neutral detergent and application of neutral detergent in cleaning hard scale of gas-gas heater (GGH) |
| CN202860937U (en) * | 2012-08-31 | 2013-04-10 | 山东龙力生物科技股份有限公司 | Micro-explosion type water pipeline scaling apparatus |
| CN104233329A (en) * | 2014-09-15 | 2014-12-24 | 河北省科学院能源研究所 | Chemical cleaning method of heat exchanger |
| CN106221965A (en) * | 2016-07-26 | 2016-12-14 | 安阳师范学院 | A kind of for gas/gas heat exchanger of wet desulphurization dirty abluent |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113251851A (en) * | 2021-04-06 | 2021-08-13 | 山东中实易通集团有限公司 | Cleaning agent for cleaning blockage (ammonium sulfate) of air preheater of coal-fired power plant and preparation and application thereof |
| CN114433551A (en) * | 2022-02-09 | 2022-05-06 | 广东韶钢松山股份有限公司 | Dirt cleaning method for fan |
Also Published As
| Publication number | Publication date |
|---|---|
| CN106989633B (en) | 2021-06-01 |
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