CN110487109A - There is the cleaning method of coking fouling plate heat exchanger - Google Patents
There is the cleaning method of coking fouling plate heat exchanger Download PDFInfo
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- CN110487109A CN110487109A CN201910894380.0A CN201910894380A CN110487109A CN 110487109 A CN110487109 A CN 110487109A CN 201910894380 A CN201910894380 A CN 201910894380A CN 110487109 A CN110487109 A CN 110487109A
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- cleaning
- heat exchanger
- plate heat
- water
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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
- F28G1/00—Non-rotary, e.g. reciprocated, appliances
- F28G1/12—Fluid-propelled scrapers, bullets, or like solid bodies
-
- 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 And De-Greasing Of Metallic Materials By Chemical Methods (AREA)
Abstract
The invention discloses a kind of cleaning methods for having coking fouling plate heat exchanger, using demineralized water, devoke cleaning solution, except iron oxide cleaning solution cleans system, after cleaning, using being dried with nitrogen, the degradable corn ball can all dissolve in the process of cleaning.Heat exchanger clean method of the invention, cleaning process innovation is ingenious, cleaning solution reasonable disposition optimizes, removal, which can be effectively improved, the cleaning efficiency and cleaning effect of plate heat exchanger of fouling coking, it can restore the heat transfer effect of plate heat exchanger, corrosion rate and corrosion total amount are below national standard, are particularly suitable for petrochemical industry large heat exchanger, it is practical, it is worthy to be popularized.
Description
Technical field
The invention belongs to field of heat exchangers more particularly to a kind of cleaning methods for having coking fouling plate heat exchanger.
Background technique
Heat exchanger is the equipment that the partial heat of hot fluid is passed to cold fluid, and heat exchanger is using water as carrier mostly
Heat-exchange system, fouling of heat exchangers is corollary in use, the design feature of heat exchanger itself and specifications and models
Difference, it is also different to will lead to scaling degree, so that inner passage section is become smaller even after fouling of heat exchangers and blocks, causes heat exchanger
Heat exchange efficiency reduces, so that the safety of production being normally carried out with equipment is influenced, therefore heat exchanger needs are periodically cleaned, with
Guarantee the efficient of heat exchanger and operate normally, avoids the generation of equipment breakdown.
The cleaning method of heat exchanger generally has physical cleaning, chemical cleaning and comprehensive cleaning, common physical cleaning to rely on
The flowing of fluid or mechanism are provided to be greater than the power of dirt adhesion strength and dirt is made to fall off from heat exchange surface, such as water spray is clear
It washes, jet cleaning and wire brush cleaning etc., this kind of cleaning is often ineffective, easily damage heat exchanger, and extremely inconvenient, disassembly
Process is time-consuming and laborious.Particularly with the high large size of special construction, the accurate heat exchange efficiency of design, plate heat exchanger, change
In thermal process plate journey and shell side can fouling coking, decline heat transfer effect, cleaning is got up particularly problematic, it is also necessary to very careful
It is careful, therefore special cleaning process need to be used.
Summary of the invention
It is good that technical problem to be solved by the invention is to provide a kind of cleaning effects, and cleaning speed is fast, particularly suitable for having
The cleaning method of coking fouling plate heat exchanger.
The present invention is achieved through the following technical solutions:
There is the cleaning method of coking fouling plate heat exchanger, which is characterized in that using demineralized water, decoking cleaning solution, remove iron oxide
Cleaning solution cleans system, and after cleaning, using being dried with nitrogen, cleaning is comprised the concrete steps that:
(1) water flushing is carried out to plate heat exchanger using the demineralized water of entrainment degradable corn collision ball, until clarification of water out；In
The collision ball constantly rubs with inner wall during water flow flows, and removes the dirt on the inner wall；
(2) at 75 DEG C -78 DEG C, plate heat exchanger is carried out using the decoking cleaning solution of entrainment degradable corn collision ball primary clear
It washes, until the pH value of primary cleaning eluate is 9-11；
(3) the primary cleaning eluate is once replaced using demineralized water, until the pH value of a displacement liquid is 6-8；
(4) at 68 DEG C -70 DEG C, using entrainment degradable corn collision ball except iron oxide cleaning solution is to plate heat exchanger progress two
Secondary cleaning, until Fe2+ and F3+ concentration tends to be balanced in secondary cleaning eluate；
(5) twice replaced to secondary cleaning eluate progress using demineralized water, until the pH value of twice replaced liquid is 6-8；
(6) plate heat exchanger is purged using nitrogen, until anhydrous；
The degradable corn ball can all dissolve in the process of cleaning.
Preferably, decoking cleaning solution devokes activating agent, the bleeding agent of 2.5-2.8wt%, 1 by 0 .6-0.65wt%
.6-1.9wt% the water composition of coke-removing agent and surplus；Except iron oxide cleaning solution is by corrosion inhibiter, the 4-4.5wt% of 0 .4-0 .5wt%
Neutral complexing agent, 1-2wt% except iron oxide activating agent and surplus water composition.
Preferably, the time that the water rinses is 5-7 hours, the time once cleaned is 7--10 hours, described
The time once replaced is 10-12 hours, and the time of the secondary cleaning is 7-10 hours, and the twice replaced time is 8-
10 hours, the time of the purging was 10-12 hours.
Preferably, water flushing is carried out to plate heat exchanger using demineralized water, until the step of water outlet clarification specifically: will
Demineralized water first injects the shell of plate heat exchanger, and the plate Shu Jinhang water for reinjecting plate heat exchanger rinses, until clarification of water out, first
The demineralized water in the plate beam is emptied, then empties the demineralized water in the shell；
Preferably, once being cleaned using decoking cleaning solution to plate heat exchanger, until the pH value of primary cleaning eluate
The step of for 9-11 specifically: cleaning solution will be devoked first inject the shell of plate heat exchanger, reinject the plate beam of plate heat exchanger
It is once cleaned, until the pH value of primary cleaning eluate is 9-11, first empties the decoking cleaning solution in the plate beam, then arrange
Decoking cleaning solution in the empty shell；
Preferably, once being replaced using demineralized water to the primary cleaning eluate, until the pH value of a displacement liquid
The step of for 6-8 specifically: demineralized water is first injected to the shell, the plate Shu Jinhang is reinjected and once replaces, until primary
The pH value of displacement liquid is 6-8, first empties the demineralized water in the plate beam, then empty the demineralized water in the shell；
Preferably, secondary cleaning is carried out to plate heat exchanger using except iron oxide cleaning solution, until in secondary cleaning eluate
The step of Fe2+ and F3+ concentration tends to be balanced specifically: will first inject the shell of plate heat exchanger except iron oxide cleaning solution, then infuse
Enter the plate Shu Jinhang secondary cleaning of plate heat exchanger, until Fe2+ and F3+ concentration tends to be balanced in secondary cleaning eluate, first arranges
Iron oxide cleaning solution is removed in the empty plate beam, then empties in the shell and removes iron oxide cleaning solution.
Preferably, remaining pressure in housing pressure > plate beam in cleaning process, effectively preventing anti-in plate beam
To pressure, equipment is avoided to suffer a loss.
The beneficial effects of the present invention are:
Heat exchanger clean method of the invention, cleaning process innovation is ingenious, and cleaning solution reasonable disposition optimizes, and can effectively improve
Except the cleaning efficiency and cleaning effect of the plate heat exchanger for having fouling coking, the heat transfer effect of plate heat exchanger can be restored, corroded
Rate and corrosion total amount are below national standard, are particularly suitable for petrochemical industry large heat exchanger, practical, are worth
It promotes.
Specific embodiment
There is the cleaning method of coking fouling plate heat exchanger, which is characterized in that using demineralized water, decoking cleaning solution, deoxygenation
Change iron cleaning solution to clean system, after cleaning, using being dried with nitrogen, cleaning is comprised the concrete steps that:
(1) water flushing is carried out to plate heat exchanger using the demineralized water of entrainment degradable corn collision ball, until clarification of water out；In
The collision ball constantly rubs with inner wall during water flow flows, and removes the dirt on the inner wall；
(2) at 75 DEG C -78 DEG C, plate heat exchanger is carried out using the decoking cleaning solution of entrainment degradable corn collision ball primary clear
It washes, until the pH value of primary cleaning eluate is 9-11；
(3) the primary cleaning eluate is once replaced using demineralized water, until the pH value of a displacement liquid is 6-8；
(4) at 68 DEG C -70 DEG C, using entrainment degradable corn collision ball except iron oxide cleaning solution is to plate heat exchanger progress two
Secondary cleaning, until Fe2+ and F3+ concentration tends to be balanced in secondary cleaning eluate；
(5) twice replaced to secondary cleaning eluate progress using demineralized water, until the pH value of twice replaced liquid is 6-8；
(6) plate heat exchanger is purged using nitrogen, until anhydrous；
The degradable corn ball can all dissolve in the process of cleaning.
Cleaning solution is devoked by decoking activating agent, the bleeding agent of 2.5-2.8wt%, 1 .6-1.9wt% of 0 .6-0.65wt%
Coke-removing agent and the water of surplus composition；Except iron oxide cleaning solution is complexed by the corrosion inhibiter of 0 .4-0 .5wt%, the neutral of 4-4.5wt%
Agent, 1-2wt% except iron oxide activating agent and surplus water composition.
The time that the water rinses is 5-7 hours, and the time once cleaned is 7--10 hours, the primary displacement
Time be 10-12 hour, time of the secondary cleaning is 7-10 hours, and the twice replaced time is 8-10 hours,
The time of the purging is 10-12 hours.
Water flushing is carried out to plate heat exchanger using demineralized water, until the step of water outlet clarification specifically: by demineralized water elder generation
The shell for injecting plate heat exchanger, the plate Shu Jinhang water for reinjecting plate heat exchanger rinses, until clarification of water out, first described in emptying
Demineralized water in plate beam, then empty the demineralized water in the shell；
Plate heat exchanger is once cleaned using decoking cleaning solution, until the step that the pH value of primary cleaning eluate is 9-11
Suddenly specifically: decoking cleaning solution is first injected to the shell of plate heat exchanger, the plate Shu Jinhang for reinjecting plate heat exchanger is once clear
It washes, until the pH value of primary cleaning eluate is 9-11, first empties the decoking cleaning solution in the plate beam, then empty the shell
In decoking cleaning solution；
The primary cleaning eluate is once replaced using demineralized water, until the pH value of a displacement liquid is the step of 6-8
Suddenly specifically: demineralized water is first injected to the shell, the plate Shu Jinhang is reinjected and once replaces, until the pH of a displacement liquid
Value is 6-8, first empties the demineralized water in the plate beam, then empty the demineralized water in the shell；
Secondary cleaning is carried out to plate heat exchanger using except iron oxide cleaning solution, until Fe2+ and F3+ in secondary cleaning eluate
The step of concentration tends to be balanced specifically: will first inject the shell of plate heat exchanger except iron oxide cleaning solution, reinject board-like change
The plate Shu Jinhang secondary cleaning of hot device first empties the plate until Fe2+ and F3+ concentration tends to be balanced in secondary cleaning eluate
Iron oxide cleaning solution is removed in beam, then empties in the shell and removes iron oxide cleaning solution.
In cleaning process, remains pressure in housing pressure > plate beam, effectively prevent the buffer brake in plate beam, keep away
Exempt from equipment to suffer a loss.
Heat exchanger clean method of the invention, cleaning process innovation is ingenious, and cleaning solution reasonable disposition optimizes, and can effectively mention
Height removal has the cleaning efficiency and cleaning effect of the plate heat exchanger of fouling coking, can restore the heat transfer effect of plate heat exchanger,
Corrosion rate and corrosion total amount are below national standard, are particularly suitable for petrochemical industry large heat exchanger, practical,
It is worthy to be popularized.
The above description is merely a specific embodiment, but scope of protection of the present invention is not limited thereto, any
The change or replacement expected without creative work, should be covered by the protection scope of the present invention.Therefore, of the invention
Protection scope should be determined by the scope of protection defined in the claims.
Claims (5)
1. there is the cleaning method of coking fouling plate heat exchanger, which is characterized in that using demineralized water, decoking cleaning solution, except oxidation
Iron cleaning solution cleans system, and after cleaning, using being dried with nitrogen, cleaning is comprised the concrete steps that:
(1) water flushing is carried out to plate heat exchanger using the demineralized water of entrainment degradable corn collision ball, until clarification of water out；
(2) at 75 DEG C -78 DEG C, plate heat exchanger is carried out using the decoking cleaning solution of entrainment degradable corn collision ball primary clear
It washes, until the pH value of primary cleaning eluate is 9-11；
(3) the primary cleaning eluate is once replaced using demineralized water, until the pH value of a displacement liquid is 6-8；
(4) at 68 DEG C -70 DEG C, using entrainment degradable corn collision ball except iron oxide cleaning solution is to plate heat exchanger progress two
Secondary cleaning, until Fe2+ and F3+ concentration tends to be balanced in secondary cleaning eluate；
(5) twice replaced to secondary cleaning eluate progress using demineralized water, until the pH value of twice replaced liquid is 6-8；
(6) plate heat exchanger is purged using nitrogen, until anhydrous；
The degradable corn ball can all dissolve in the process of cleaning.
2. the cleaning method according to claim 1 for having coking fouling plate heat exchanger, which is characterized in that decoking cleaning solution
By the water group of the decoking activating agent of 0 .6-0.65wt%, the bleeding agent of 2.5-2.8wt%, the coke-removing agent of 1 .6-1.9wt% and surplus
At；Except iron oxide cleaning solution by the corrosion inhibiter of 0 .4-0 .5wt%, the neutral complexing agent of 4-4.5wt%, 1-2wt% remove iron oxide
Activating agent and the water of surplus composition.
3. the cleaning method according to claim 1 for having coking fouling plate heat exchanger, which is characterized in that the water rinses
Time be 5-7 hour, the time once cleaned be 7--10 hours, the time once replaced be 10-12 hours,
The time of the secondary cleaning is 7-10 hours, and the twice replaced time is 8-10 hours, and the time of the purging is 10-
12 hours.
4. the cleaning method according to claim 1 for having coking fouling plate heat exchanger, which is characterized in that use demineralized water
Water flushing is carried out to plate heat exchanger, until the step of water outlet clarification specifically: demineralized water is first injected to the shell of plate heat exchanger
Body, the plate Shu Jinhang water for reinjecting plate heat exchanger rinses, until clarification of water out, first empties the demineralized water in the plate beam, then
Empty the demineralized water in the shell.
5. the cleaning method according to claim 1 for having coking fouling plate heat exchanger, which is characterized in that cleaning process
In, it remains pressure in housing pressure > plate beam, effectively prevents the buffer brake in plate beam, equipment is avoided to suffer a loss.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910894380.0A CN110487109A (en) | 2019-09-20 | 2019-09-20 | There is the cleaning method of coking fouling plate heat exchanger |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910894380.0A CN110487109A (en) | 2019-09-20 | 2019-09-20 | There is the cleaning method of coking fouling plate heat exchanger |
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| Publication Number | Publication Date |
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| CN110487109A true CN110487109A (en) | 2019-11-22 |
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| CN201910894380.0A Pending CN110487109A (en) | 2019-09-20 | 2019-09-20 | There is the cleaning method of coking fouling plate heat exchanger |
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Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102980435A (en) * | 2012-12-11 | 2013-03-20 | 机械工业第三设计研究院 | On-line cleaning method of inner wall of heat exchanger tube |
| JP2015218981A (en) * | 2014-05-20 | 2015-12-07 | 国立研究開発法人日本原子力研究開発機構 | Method and device for removing deposit in water tube boiler |
| CN105821424A (en) * | 2016-05-30 | 2016-08-03 | 江阴市亚龙换热设备有限公司 | Cleaning method of stainless steel plate heat exchanger |
| CN106011892A (en) * | 2016-08-11 | 2016-10-12 | 岳阳宇翔科技有限公司 | Cleaning compound and method for cleaning all-welded plate heat exchanger by using cleaning compound |
| CN109341408A (en) * | 2018-10-12 | 2019-02-15 | 孙永庆 | Plate heat exchanger Integral cleaning method |
-
2019
- 2019-09-20 CN CN201910894380.0A patent/CN110487109A/en active Pending
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102980435A (en) * | 2012-12-11 | 2013-03-20 | 机械工业第三设计研究院 | On-line cleaning method of inner wall of heat exchanger tube |
| JP2015218981A (en) * | 2014-05-20 | 2015-12-07 | 国立研究開発法人日本原子力研究開発機構 | Method and device for removing deposit in water tube boiler |
| CN105821424A (en) * | 2016-05-30 | 2016-08-03 | 江阴市亚龙换热设备有限公司 | Cleaning method of stainless steel plate heat exchanger |
| CN106011892A (en) * | 2016-08-11 | 2016-10-12 | 岳阳宇翔科技有限公司 | Cleaning compound and method for cleaning all-welded plate heat exchanger by using cleaning compound |
| CN109341408A (en) * | 2018-10-12 | 2019-02-15 | 孙永庆 | Plate heat exchanger Integral cleaning method |
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Application publication date: 20191122 |
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