CN106989633B - Cleaning method of heat exchanger for crude gas heat exchange - Google Patents
Cleaning method of heat exchanger for crude gas heat exchange Download PDFInfo
- Publication number
- CN106989633B CN106989633B CN201710376408.2A CN201710376408A CN106989633B CN 106989633 B CN106989633 B CN 106989633B CN 201710376408 A CN201710376408 A CN 201710376408A CN 106989633 B CN106989633 B CN 106989633B
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- China
- Prior art keywords
- heat exchanger
- cleaning
- cleaning liquid
- concentration
- liquid tank
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- 238000004140 cleaning Methods 0.000 title claims abstract description 61
- 238000000034 method Methods 0.000 title claims abstract description 20
- 230000007797 corrosion Effects 0.000 claims abstract description 9
- 238000005260 corrosion Methods 0.000 claims abstract description 9
- 239000007788 liquid Substances 0.000 claims description 30
- 238000002791 soaking Methods 0.000 claims description 20
- UHOVQNZJYSORNB-UHFFFAOYSA-N Benzene Chemical compound C1=CC=CC=C1 UHOVQNZJYSORNB-UHFFFAOYSA-N 0.000 claims description 18
- HEMHJVSKTPXQMS-UHFFFAOYSA-M Sodium hydroxide Chemical compound [OH-].[Na+] HEMHJVSKTPXQMS-UHFFFAOYSA-M 0.000 claims description 15
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 14
- CDBYLPFSWZWCQE-UHFFFAOYSA-L Sodium Carbonate Chemical compound [Na+].[Na+].[O-]C([O-])=O CDBYLPFSWZWCQE-UHFFFAOYSA-L 0.000 claims description 10
- YXFVVABEGXRONW-UHFFFAOYSA-N Toluene Chemical compound CC1=CC=CC=C1 YXFVVABEGXRONW-UHFFFAOYSA-N 0.000 claims description 9
- 239000003513 alkali Substances 0.000 claims description 7
- 239000004094 surface-active agent Substances 0.000 claims description 7
- 239000010425 asbestos Substances 0.000 claims description 6
- 239000003795 chemical substances by application Substances 0.000 claims description 6
- 230000000149 penetrating effect Effects 0.000 claims description 6
- 229910052895 riebeckite Inorganic materials 0.000 claims description 6
- 235000017550 sodium carbonate Nutrition 0.000 claims description 5
- 229910000029 sodium carbonate Inorganic materials 0.000 claims description 5
- 235000011121 sodium hydroxide Nutrition 0.000 claims description 5
- 239000001488 sodium phosphate Substances 0.000 claims description 5
- RYFMWSXOAZQYPI-UHFFFAOYSA-K trisodium phosphate Chemical compound [Na+].[Na+].[Na+].[O-]P([O-])([O-])=O RYFMWSXOAZQYPI-UHFFFAOYSA-K 0.000 claims description 5
- 229910000406 trisodium phosphate Inorganic materials 0.000 claims description 5
- 235000019801 trisodium phosphate Nutrition 0.000 claims description 5
- CTQNGGLPUBDAKN-UHFFFAOYSA-N O-Xylene Chemical compound CC1=CC=CC=C1C CTQNGGLPUBDAKN-UHFFFAOYSA-N 0.000 claims description 3
- DBMJMQXJHONAFJ-UHFFFAOYSA-M Sodium laurylsulphate Chemical group [Na+].CCCCCCCCCCCCOS([O-])(=O)=O DBMJMQXJHONAFJ-UHFFFAOYSA-M 0.000 claims description 3
- 238000007599 discharging Methods 0.000 claims description 3
- 230000007935 neutral effect Effects 0.000 claims description 3
- 229940051841 polyoxyethylene ether Drugs 0.000 claims description 3
- 229920000056 polyoxyethylene ether Polymers 0.000 claims description 3
- 239000008096 xylene Substances 0.000 claims description 3
- 239000000203 mixture Substances 0.000 claims description 2
- 229910001220 stainless steel Inorganic materials 0.000 claims description 2
- 239000010935 stainless steel Substances 0.000 claims description 2
- 239000000126 substance Substances 0.000 abstract description 3
- 239000003814 drug Substances 0.000 abstract description 2
- 229940079593 drug Drugs 0.000 abstract description 2
- 238000002309 gasification Methods 0.000 description 4
- 239000003245 coal Substances 0.000 description 3
- 239000000428 dust Substances 0.000 description 2
- 239000011269 tar Substances 0.000 description 2
- 238000005406 washing Methods 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000005422 blasting Methods 0.000 description 1
- 239000011280 coal tar Substances 0.000 description 1
- 238000001816 cooling Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
Classifications
-
- 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
Landscapes
- 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 cleaning method of a heat exchanger for crude gas heat exchange, which has the advantages of simple and easily obtained chemical medicines, simple operation of the cleaning process, small corrosivity, high efficiency of removing corrosion and scaling deposits on the surface of the heat exchanger, no need of disassembly for cleaning and suitability for industrial popularization and application.
Description
Technical Field
The invention belongs to the field of cleaning of chemical equipment, and particularly relates to a cleaning method of a heat exchanger used for cooling and heat exchanging crude gas prepared by a fixed bed coal gasification process.
Background
Compared with the entrained-flow bed and fluidized bed coal gasification processes, the fixed bed coal gasification process has the advantages that the gasification pressure and temperature (pressure: 0-4MPa; temperature: 800-.
The traditional cleaning method for the blocked heat exchanger is to loose a core of the heat exchanger, manually clean dust and tar attached to a tube bundle and a shell of the heat exchanger, and then clean the tube bundle and the shell by using a high-pressure water gun. The cleaning method is time-consuming and labor-consuming, and is not thorough in cleaning tar attached between tube bundles.
Disclosure of Invention
In order to overcome the defects of the prior art, the invention provides the cleaning method of the heat exchanger for crude gas heat exchange, which does not need to be disassembled for cleaning, and has the advantages of simple operation, short cleaning time and good cleaning effect.
The purpose of the invention is realized by the following technical scheme:
a cleaning method of a heat exchanger for crude gas heat exchange comprises the following steps:
(1) connecting a cleaning liquid tank and a circulating pump on the heat exchanger to be cleaned during shutdown to form a closed circulating cleaning system;
(2) adding the soaking solution into a cleaning solution tank, starting a circulating pump to pump the soaking solution into a heat exchanger, stopping the pump when the soaking solution flows through the heat exchanger and flows back to the cleaning solution tank, standing and soaking for 36 hours, and then draining the soaking solution; the soaking solution is light oil and benzene with toluene and xylene content more than or equal to 84%, and the light oil and the benzene are prepared according to the mass ratio of 6: 4;
(3) hanging corrosion hanging pieces in a cleaning liquid tank, adding water into the cleaning liquid tank, opening a circulating pump to establish water circulation, adding alkali, a penetrating agent and a surfactant into the cleaning liquid tank to form cleaning liquid, introducing low-pressure steam of 0.5MPa and 200 ℃ to heat the liquid in the cleaning liquid tank to 85-90 ℃, continuously circulating for 8 hours and then draining the cleaning liquid;
(4) adding clear water into a cleaning liquid tank, starting a circulating pump, replacing the clear water for multiple times to flush residual liquid in the heat exchanger, adjusting the pH value to be neutral, and then discharging;
(5) and (3) removing the seal head on the heat exchanger, adding a medium-pressure asbestos plate with the thickness of 3mm on a flange of the heat exchanger, and then introducing 0.6MPa of pressurized air from the inlet at the lower part of the heat exchanger for pressurizing until the asbestos plate at the upper part of the heat exchanger bursts suddenly.
Further, in the step (3), the penetrating agent is fatty alcohol-polyoxyethylene ether, and the surfactant is sodium dodecyl sulfate.
Furthermore, the corrosion hanging piece is an I-shaped stainless steel test piece.
Further, the concentration of the alkali in the cleaning solution in the step (3) is 8.0%, the concentration of the penetrating agent is 0.2%, and the concentration of the surfactant is 0.1%.
Further, in the step (3), the alkali is a mixture of caustic soda, soda ash and trisodium phosphate, wherein in the cleaning solution, the concentration of the caustic soda is 3%, the concentration of the soda ash is 3%, and the concentration of the trisodium phosphate is 2%.
The invention has the beneficial effects that: the scale layer formed by dust and coal tar in the heat exchanger can be loosened and cracked by soaking in the soaking solution; residual oil dirt can be dissolved by alkali, penetrant and surfactant, and a dirt layer which becomes loose and cracks after being soaked is subjected to permeation stripping; the scales stripped and fallen off after alkaline washing can be flushed out of the equipment by water washing; through air blasting, the scale remained on the pipe wall can be completely taken out of the heat exchanger by the change of air instantaneous pressure and flow velocity, and finally the heat exchanger is thoroughly cleaned.
The cleaning method of the heat exchanger has the advantages of simple and easily obtained chemical medicines, simple operation in the cleaning process, small corrosivity, high efficiency in removing corrosion and scaling deposits on the surface of the heat exchanger, no need of disassembly for cleaning, and suitability for industrial popularization and application.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
A cleaning method of a heat exchanger for crude gas heat exchange comprises the following steps:
(1) connecting a cleaning liquid tank and a circulating pump on the heat exchanger to be cleaned during shutdown to form a closed circulating cleaning system;
(2) adding the soaking solution into a cleaning solution tank, starting a circulating pump to pump the soaking solution into a heat exchanger, stopping the pump when the soaking solution flows through the heat exchanger and flows back to the cleaning solution tank, standing and soaking for 36 hours, and then draining the soaking solution; the soaking solution is light oil and benzene with toluene and xylene content more than or equal to 84%, and the light oil and the benzene are prepared according to the mass ratio of 6: 4;
(3) hanging I-type corrosion hanging pieces in a cleaning liquid tank, adding water into the cleaning liquid tank, starting a circulating pump to establish water circulation, adding caustic soda, sodium carbonate, trisodium phosphate, fatty alcohol-polyoxyethylene ether and sodium dodecyl sulfate into the cleaning liquid tank to form cleaning liquid, introducing low-pressure steam of 0.5MPa and 200 ℃ to heat the liquid in the cleaning liquid tank to 85-90 ℃, continuously circulating for 8 hours and draining the cleaning liquid;
(4) adding clear water into a cleaning liquid tank, starting a circulating pump, replacing the clear water for multiple times to flush residual liquid in the heat exchanger, adjusting the pH value to be neutral, and then discharging;
(5) and (3) removing the end socket on the heat exchanger, adding a medium-pressure asbestos plate with the thickness of 3mm on a flange of the heat exchanger, and then introducing 0.6MPa of air from the inlet at the lower part of the heat exchanger for pressurizing until the asbestos plate at the upper part of the heat exchanger bursts suddenly.
The heat exchanger cleaned has a descaling rate of 98 percent and a corrosion rate of 0.1 mg/square meter h which is far less than the international corrosion standard.
The above description is only an embodiment of the present invention, but the scope of the present invention is not limited thereto, and any changes or substitutions that are not thought of through the inventive work should be included in the scope of the present invention.
Claims (5)
1. A cleaning method of a heat exchanger for crude gas heat exchange is characterized by comprising the following steps:
(1) connecting a cleaning liquid tank and a circulating pump on the heat exchanger to be cleaned during shutdown to form a closed circulating cleaning system;
(2) adding the soaking solution into a cleaning solution tank, starting a circulating pump to pump the soaking solution into a heat exchanger, stopping the pump when the soaking solution flows through the heat exchanger and flows back to the cleaning solution tank, standing and soaking for 36 hours, and then draining the soaking solution; the soaking solution is light oil and benzene with toluene and xylene content more than or equal to 84%, and the light oil and the benzene are prepared according to the mass ratio of 6: 4;
(3) hanging corrosion hanging pieces in a cleaning liquid tank, adding water into the cleaning liquid tank, opening a circulating pump to establish water circulation, adding alkali, a penetrating agent and a surfactant into the cleaning liquid tank to form cleaning liquid, introducing low-pressure steam of 0.5MPa and 200 ℃ to heat the liquid in the cleaning liquid tank to 85-90 ℃, continuously circulating for 8 hours and then draining the cleaning liquid;
(4) adding clear water into a cleaning liquid tank, starting a circulating pump, replacing the clear water for multiple times to flush residual liquid in the heat exchanger, adjusting the pH value to be neutral, and then discharging;
(5) and (3) removing the seal head on the heat exchanger, adding a medium-pressure asbestos plate with the thickness of 3mm on a flange of the heat exchanger, and then introducing 0.6MPa of pressurized air from the inlet at the lower part of the heat exchanger for pressurizing until the asbestos plate at the upper part of the heat exchanger bursts suddenly.
2. The method for cleaning the heat exchanger for the crude gas heat exchange as claimed in claim 1, wherein the penetrating agent in the step (3) is fatty alcohol-polyoxyethylene ether, and the surfactant is sodium dodecyl sulfate.
3. The method for cleaning the heat exchanger for the crude gas heat exchange according to claim 1, wherein the corrosion hanging pieces in the step (3) are I-type stainless steel test pieces.
4. The method for cleaning the heat exchanger for the crude gas heat exchange as claimed in claim 1, wherein the concentration of the alkali in the cleaning solution in the step (3) is 8.0%, the concentration of the penetrating agent is 0.2%, and the concentration of the surfactant is 0.1%.
5. The method for cleaning the heat exchanger for the heat exchange of the raw gas as recited in claim 1, wherein the alkali in the step (3) is a mixture of caustic soda, soda ash and trisodium phosphate, and wherein the concentration of the caustic soda is 3%, the concentration of the soda ash is 3% and the concentration of the trisodium phosphate is 2% in the cleaning solution.
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 CN106989633A (en) | 2017-07-28 |
| CN106989633B true CN106989633B (en) | 2021-06-01 |
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Family Applications (1)
| 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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| Country | Link |
|---|---|
| CN (1) | CN106989633B (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US12510313B1 (en) | 2025-07-23 | 2025-12-30 | Kuwait National Petroleum Company | Method of cleaning a cold box |
Families Citing this family (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114433581B (en) * | 2020-10-30 | 2024-10-29 | 中国石油化工股份有限公司 | Cleaning system and cleaning method for ethylene device cold box |
| CN113251851B (en) * | 2021-04-06 | 2023-06-02 | 山东中实易通集团有限公司 | Cleaning agent for cleaning air preheater blockage (ammonium sulfate salt) 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 |
| CN116772648A (en) * | 2023-02-03 | 2023-09-19 | 江苏三美化工有限公司 | A cleaning method for hydrogen fluoride distillation heat exchanger |
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 cleaning yarn transfer rolls |
| 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 | Dry cleaning method of heat exchanger using dry ice |
| CN102242028A (en) * | 2011-05-20 | 2011-11-16 | 浙江浙能能源技术有限公司 | A kind of neutral cleaning agent and its application in GGH hard scale cleaning |
| 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 cleaning yarn transfer rolls |
| 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 | Dry cleaning method of heat exchanger using dry ice |
| CN102242028A (en) * | 2011-05-20 | 2011-11-16 | 浙江浙能能源技术有限公司 | A kind of neutral cleaning agent and its application in GGH hard scale cleaning |
| 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 (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US12510313B1 (en) | 2025-07-23 | 2025-12-30 | Kuwait National Petroleum Company | Method of cleaning a cold box |
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| Publication number | Publication date |
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| CN106989633A (en) | 2017-07-28 |
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