CN110595260A - On-line cleaning method for dirt of shell-and-tube heat exchanger - Google Patents
On-line cleaning method for dirt of shell-and-tube heat exchanger Download PDFInfo
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- CN110595260A CN110595260A CN201910948125.XA CN201910948125A CN110595260A CN 110595260 A CN110595260 A CN 110595260A CN 201910948125 A CN201910948125 A CN 201910948125A CN 110595260 A CN110595260 A CN 110595260A
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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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Abstract
The invention discloses an online cleaning method for dirt of a shell-and-tube heat exchanger, which is characterized in that a rotary insertion type pipeline is adopted to carry out solid-phase cleaning on the dirt of the shell-and-tube heat exchanger under the action of high-speed fluid, the rotary insertion type pipeline is a double-spiral spring tube, the double-spiral spring tube comprises a liquid-phase jet cleaning pipeline and a gas jet cleaning pipeline, the liquid-phase jet cleaning pipeline is communicated with a liquid cleaning unit through liquid to realize liquid-phase jet cleaning on the dirt, and the gas jet cleaning pipeline is communicated with a gas cleaning unit through gas to carry out gas jet cleaning on the dirt. The method for cleaning dirt of the shell-and-tube heat exchanger on line has the characteristics of convenience in cleaning, good cleaning effect and short cleaning time.
Description
Technical Field
The invention relates to the technical field of heat exchangers, in particular to an online cleaning method for dirt of a shell-and-tube heat exchanger.
Background
During operation of the heat exchanger, fouling of the walls inevitably occurs. Even if the water is cooled by fresh water with good quality, the thickness of dirt after one year can reach 2-3 mm. And the heat conductivity of dirt is poor, and is 1/30-1/50 of steel, which causes waste of a large amount of energy and resources.
In view of the above, the chemical cleaning method or the mechanical physical cleaning method is mainly used to clean the fouling of the shell-and-tube heat exchanger. However, the nature of the fouling varies depending on the type of fouling. Even if the same type of dirt exists, the dirt is different according to different structures, materials and operations of equipment, and the cleaning effect is general.
Disclosure of Invention
The invention aims to provide an online cleaning method for dirt of a shell-and-tube heat exchanger, which combines dressing powder for use and has the characteristics of convenience in cleaning, good cleaning effect and short cleaning time.
The invention can be realized by the following technical scheme:
the invention discloses an online cleaning method for dirt of a shell-and-tube heat exchanger, which is characterized in that a rotary insertion type pipeline is adopted to carry out solid-phase cleaning on the dirt of the shell-and-tube heat exchanger under the action of high-speed fluid, the rotary insertion type pipeline is a double-spiral spring tube, the double-spiral spring tube comprises a liquid-phase jet cleaning pipeline and a gas jet cleaning pipeline, the liquid-phase jet cleaning pipeline is communicated with a liquid cleaning unit through liquid to realize liquid-phase jet cleaning on the dirt, and the gas jet cleaning pipeline is communicated with a gas cleaning unit through gas to carry out gas jet cleaning on the dirt.
From the point of view of fouling formation, fouling in heat exchangers is largely divided into five major categories: scale, crystal deposition, dirt from mechanical or organic decomposition, product decomposition, corrosion and scaling, etc.; factors influencing the fouling mainly comprise fluid properties, a geometric mechanism of a heat exchanger, flow speed, temperature and the like; regarding the main cleaning method at present, the chemical cleaning method depends heavily on the dissolving capacity of the solvent for dirt, the strong corrosive solvent has good cleaning effect and can cause corrosion to the heat exchanger, and the chemical cleaning method is not particularly common in the prior art; the mechanical cleaning method is relatively simple to operate, but is easily influenced by the geometric mechanism of the heat exchanger to influence the cleaning effect; the plug-in mechanical cleaning is the main method for cleaning the heat exchanger on line at present, and is also limited by the method. For a shell-and-tube heat exchanger, baffles are arranged on the geometric mechanism of the shell-and-tube heat exchanger, which can affect the flow velocity, and the flow velocity is reduced nearby, so that the cleaning effect in the area is poor. According to the technical scheme, on the basis of comprehensively considering the factors, the double-spiral spring tube is adopted for solid-phase cleaning, radial and axial vibration is generated under the action of fluid, and the spring tube can rotate integrally to scrub the heat transfer surface at a high flow speed to realize high descaling efficiency due to the fact that the spring tube can rotate integrally to scrub the heat transfer surface; the liquid-phase jet cleaning pipeline can jet high-pressure cleaning liquid to dissolve, acidolyze and impact dirt, effectively solves the problem that the dirt cannot be cleaned due to the fact that the solid-phase cleaning receives the geometric structure of the heat exchanger, quickly removes the dirt and improves the descaling efficiency; the arrangement of the gas-phase jet flushing pipeline enables high-pressure gas to be jetted out, and when bubbles float upwards and move, three-phase fluidization of gas, liquid and solid flows across the flushing pipeline, so that the condition of uneven cleaning caused by the existence of a stagnant area is effectively overcome.
Further, the gas cleaning unit comprises an annular gas flow multiplier, the gas jet cleaning pipeline is provided with an air outlet hole, and the air outlet hole is arranged along the direction of an included angle of 5 degrees above the arc-shaped wing surface of the gas jet cleaning pipeline. The input high-pressure gas can be further pressurized through the annular air multiplier, the high-pressure gas is sprayed out from a 2.5mm crack of the annular air multiplier, the pressure of the high-pressure gas is 15 times of that of sucked air, and the high-pressure gas has strong impact force and effectively promotes the fluidity and the cleaning uniformity of a three-phase interface; the angle setting of the air outlet hole is consistent with the air outlet angle of the annular air multiplier, and the impact force caused by the air jet of the annular air multiplier is effectively guaranteed.
Furthermore, the liquid-phase spraying cleaning unit is of a switchable control structure and comprises an acid liquid subunit, a soaking liquid subunit, a protection liquid subunit and a clear water subunit, different subunits can be flexibly selected according to actual needs, the cleaning requirements of different types of dirt are met, and the liquid-phase spraying cleaning unit has high applicability.
Furthermore, liquid outlet holes are formed in the liquid-phase spraying cleaning pipeline, the opening direction of the liquid outlet holes is perpendicular to the pipe bundle direction of the liquid-phase spraying cleaning pipeline, effective high-pressure liquid-phase spraying is conducted on the inside of the shell-and-tube heat exchanger, no dead angle impact exists, and the cleaning efficiency is improved. .
Further, in a shell-and-tube heat exchanger, the axial flow velocity of fluid is 16-19 m/s, the overall flow velocity in a shell pass is effectively ensured by high-speed fluid, and even if a detention area of a baffle plate forms a certain fluid velocity, dirt is convenient to take away.
Furthermore, the liquid in the acid liquor subunit is oxalic acid, acetic acid, hydrochloric acid, sulfuric acid or sulfamic acid, and can be flexibly selected according to actual needs.
Further, the liquid for soaking the liquid subunits is a mixture of a dispersed chelating agent and a stripping agent; the dispersed chelating agent is one or two of maleic acid-acrylic acid copolymer, hydroxypropyl acrylate, polyacrylic acid and 2-phosphonobutane L, 2, 4-carboxylic acid, and the concentration of the dispersed chelating agent is lOOmg/L-150 mg/L; the stripping agent is one or two of dodecyl dimethyl benzyl ammonium chloride aqueous solution, tetradecyl dimethyl benzyl ammonium chloride, octadecyl dimethyl benzyl ammonium chloride, dodecyl dimethyl benzyl ammonium bromide and hexadecyl dimethyl (2-sulfurous acid) ethyl ammonium, and the concentration of the stripping agent is lOOmg/L-150 mg/L.
Further, the protective liquid subunit is 1wt% sodium nitrite water solution.
The invention discloses an online cleaning method for dirt of a shell-and-tube heat exchanger, which has the following beneficial effects:
the method has the advantages that firstly, the cleaning is convenient, the on-line cleaning of the shell-and-tube heat exchanger is realized, the whole cleaning process does not need to be disassembled, the interior of the heat exchanger is directly cleaned, no pollution is caused, and the cleaning process is simple and convenient;
secondly, the cleaning effect is good, after cleaning, the front-back pressure difference of the heat exchanger is obviously reduced, the temperature of the heat exchange medium required by the heat exchanger is effectively increased to achieve the same heat exchange effect, and the flow rate of the cooling medium of the heat exchanger is reduced from 68% to 53% after cleaning;
and thirdly, the cleaning time is short, the gas phase, the liquid phase and the solid phase are combined in the cleaning process of the high-speed fluid, the cleaning time is effectively shortened, and the cleaning time is shortened to 0.5-1 hour from the original 3-4 hours.
Detailed Description
In order to make the technical solution of the present invention better understood by those skilled in the art, the following provides a detailed description of the product of the present invention with reference to the examples.
The invention discloses an online cleaning method for dirt of a shell-and-tube heat exchanger, which is characterized in that a rotary insertion type pipeline is adopted to carry out solid-phase cleaning on the dirt of the shell-and-tube heat exchanger under the action of high-speed fluid, the rotary insertion type pipeline is a double-spiral spring tube, the double-spiral spring tube comprises a liquid-phase jet cleaning pipeline and a gas jet cleaning pipeline, the liquid-phase jet cleaning pipeline is communicated with a liquid cleaning unit through liquid to realize liquid-phase jet cleaning on the dirt, and the gas jet cleaning pipeline is communicated with a gas cleaning unit through gas to carry out gas jet cleaning on the dirt.
Further, the gas cleaning unit comprises an annular gas flow multiplier, the gas jet cleaning pipeline is provided with an air outlet hole, and the air outlet hole is arranged along the direction of an included angle of 5 degrees above the arc-shaped wing surface of the gas jet cleaning pipeline.
Furthermore, the liquid-phase spraying cleaning unit is of a switchable control structure and comprises an acid liquid subunit, a soaking liquid subunit, a protection liquid subunit and a clear water subunit.
Furthermore, a liquid outlet hole is formed in the liquid-phase jet cleaning pipeline, and the opening direction of the liquid outlet hole is perpendicular to the pipe bundle direction of the liquid-phase jet cleaning pipeline.
Further, in a shell-and-tube heat exchanger, the axial flow velocity of the fluid is 16-19 m/s.
Further, the liquid in the acid liquor subunit is oxalic acid, acetic acid, hydrochloric acid, sulfuric acid or sulfamic acid.
Further, the liquid for soaking the liquid subunits is a mixture of a dispersed chelating agent and a stripping agent; the dispersed chelating agent is one or two of maleic acid-acrylic acid copolymer, hydroxypropyl acrylate, polyacrylic acid and 2-phosphonobutane L, 2, 4-carboxylic acid, and the concentration of the dispersed chelating agent is lOOmg/L-150 mg/L; the stripping agent is one or two of dodecyl dimethyl benzyl ammonium chloride aqueous solution, tetradecyl dimethyl benzyl ammonium chloride, octadecyl dimethyl benzyl ammonium chloride, dodecyl dimethyl benzyl ammonium bromide and hexadecyl dimethyl (2-sulfurous acid) ethyl ammonium, and the concentration of the stripping agent is lOOmg/L-150 mg/L.
Further, the protective liquid subunit is 1wt% sodium nitrite water solution.
Example 1
The invention discloses an online cleaning method for dirt of a shell-and-tube heat exchanger, which is characterized in that a rotary insertion type pipeline is adopted to carry out solid-phase cleaning on the dirt of the shell-and-tube heat exchanger under the action of high-speed fluid, the rotary insertion type pipeline is a double-spiral spring tube, the double-spiral spring tube comprises a liquid-phase jet cleaning pipeline and a gas jet cleaning pipeline, the liquid-phase jet cleaning pipeline is communicated with a liquid cleaning unit through liquid to realize liquid-phase jet cleaning on the dirt, and the gas jet cleaning pipeline is communicated with a gas cleaning unit through gas to carry out gas jet cleaning on the dirt. The gas cleaning unit comprises an annular gas flow multiplier, the gas jet cleaning pipeline is provided with an air outlet, and the air outlet is arranged along the direction of an included angle of 5 degrees above the arc-shaped wing surface of the gas jet cleaning pipeline. Liquid outlet holes are formed in the liquid-phase jet cleaning pipeline, and the opening direction of the liquid outlet holes is perpendicular to the pipe bundle direction of the liquid-phase jet cleaning pipeline. In a shell-and-tube heat exchanger, the axial flow velocity of fluid is 16-19 m/s.
In this embodiment, the liquid phase jet cleaning unit is switched to a clean water sub-unit, and the clean water is used for rinsing.
In this example, as a comparison, the gas phase spray cleaning line was not communicated with the high-pressure gas as comparative example 1, and the cleaning effects of the two were compared. By comparison, under the same fluid speed, the cleaning time of the example 1 is reduced from 3 hours to 1 hour of the comparative example, the flow rate of the generated waste water is reduced 2/3, and the heat exchange efficiency after cleaning is improved from 49 percent to 75 percent of that of the comparative example 1.
Example 2
The invention discloses an online cleaning method for dirt of a shell-and-tube heat exchanger, which is characterized in that a rotary insertion type pipeline is adopted to carry out solid-phase cleaning on the dirt of the shell-and-tube heat exchanger under the action of high-speed fluid, the rotary insertion type pipeline is a double-spiral spring tube, the double-spiral spring tube comprises a liquid-phase jet cleaning pipeline and a gas jet cleaning pipeline, the liquid-phase jet cleaning pipeline is communicated with a liquid cleaning unit through liquid to realize liquid-phase jet cleaning on the dirt, and the gas jet cleaning pipeline is communicated with a gas cleaning unit through gas to carry out gas jet cleaning on the dirt. The gas cleaning unit comprises an annular gas flow multiplier, the gas jet cleaning pipeline is provided with an air outlet, and the air outlet is arranged along the direction of an included angle of 5 degrees above the arc-shaped wing surface of the gas jet cleaning pipeline. Liquid outlet holes are formed in the liquid-phase jet cleaning pipeline, and the opening direction of the liquid outlet holes is perpendicular to the pipe bundle direction of the liquid-phase jet cleaning pipeline. In a shell-and-tube heat exchanger, the axial flow velocity of fluid is 16-19 m/s.
In this embodiment, the liquid-phase spray cleaning unit is switched to an acid liquid subunit and a protection liquid subunit, the acid liquid subunit is used in the early cleaning period, and the protection liquid subunit is used in the later cleaning period. The liquid in the acid liquid subunit is oxalic acid, acetic acid, hydrochloric acid, sulfuric acid or sulfamic acid. The protective liquid subunit is 1wt% sodium nitrite water solution.
In this example, as a comparison, the gas phase spray cleaning line was not communicated with the high-pressure gas as comparative example 2, and the cleaning effects of the two were compared. By comparison, under the same fluid velocity, the cleaning time of the example 2 is reduced from 4 hours to 1.3 hours of the comparative example, the generated waste liquid flow is reduced by 70%, and the heat exchange efficiency after cleaning is improved from 47% to 76% of the comparative example 2.
Example 3
The invention discloses an online cleaning method for dirt of a shell-and-tube heat exchanger, which is characterized in that a rotary insertion type pipeline is adopted to carry out solid-phase cleaning on the dirt of the shell-and-tube heat exchanger under the action of high-speed fluid, the rotary insertion type pipeline is a double-spiral spring tube, the double-spiral spring tube comprises a liquid-phase jet cleaning pipeline and a gas jet cleaning pipeline, the liquid-phase jet cleaning pipeline is communicated with a liquid cleaning unit through liquid to realize liquid-phase jet cleaning on the dirt, and the gas jet cleaning pipeline is communicated with a gas cleaning unit through gas to carry out gas jet cleaning on the dirt. The gas cleaning unit comprises an annular gas flow multiplier, the gas jet cleaning pipeline is provided with an air outlet, and the air outlet is arranged along the direction of an included angle of 5 degrees above the arc-shaped wing surface of the gas jet cleaning pipeline. Liquid outlet holes are formed in the liquid-phase jet cleaning pipeline, and the opening direction of the liquid outlet holes is perpendicular to the pipe bundle direction of the liquid-phase jet cleaning pipeline. In a shell-and-tube heat exchanger, the axial flow velocity of fluid is 16-19 m/s.
In the embodiment, the liquid-phase jet cleaning unit is switched to a soaking liquid subunit, and the liquid of the soaking liquid subunit is a mixture of a dispersed chelating agent and a stripping agent; the dispersed chelating agent is one or two of maleic acid-acrylic acid copolymer, hydroxypropyl acrylate, polyacrylic acid and 2-phosphonobutane L, 2, 4-carboxylic acid, and the concentration of the dispersed chelating agent is lOOmg/L-150 mg/L; the stripping agent is one or two of dodecyl dimethyl benzyl ammonium chloride aqueous solution, tetradecyl dimethyl benzyl ammonium chloride, octadecyl dimethyl benzyl ammonium chloride, dodecyl dimethyl benzyl ammonium bromide and hexadecyl dimethyl (2-sulfurous acid) ethyl ammonium, and the concentration of the stripping agent is lOOmg/L-150 mg/L.
In this example, as a comparison, the gas phase spray cleaning line was not communicated with the high-pressure gas as comparative example 3, and the cleaning effects of the two were compared. By comparison, the cleaning time of example 3 is reduced from 6 hours to 1.6 hours of the comparative example, the flow rate of the generated waste water is reduced by 65%, and the heat exchange efficiency after cleaning is improved from 46% to 78% of the comparative example 3 under the same fluid speed.
The foregoing is merely a preferred embodiment of the invention and is not intended to limit the invention in any manner; as will be readily apparent to those skilled in the art from the disclosure herein, the present invention may be practiced without these specific details; however, those skilled in the art should appreciate that they can readily use the disclosed conception and specific embodiments as a basis for designing or modifying other structures for carrying out the same purposes of the present invention; meanwhile, any changes, modifications, and evolutions of the equivalent changes of the above embodiments according to the actual techniques of the present invention are still within the protection scope of the technical solution of the present invention.
Claims (8)
1. An on-line cleaning method for dirt of a shell-and-tube heat exchanger is characterized in that a rotary insertion type pipeline is adopted to carry out solid-phase cleaning on the dirt of the shell-and-tube heat exchanger under the action of high-speed fluid, and the method comprises the following steps: rotatory bayonet pipeline is double helix formula spring pipe, and double helix formula spring pipe includes that liquid phase sprays to wash pipeline and gas injection and washs the pipeline, liquid phase sprays to wash the pipeline and realizes wasing the liquid phase injection of dirt with liquid cleaning unit liquid intercommunication, gas injection washs pipeline and gas cleaning unit gas intercommunication and washs the gas injection of dirt.
2. A shell and tube heat exchanger foulant on-line cleaning method according to claim 1, characterized in that: the gas cleaning unit comprises an annular airflow multiplier, an air outlet is formed in the gas jet cleaning pipeline, and the air outlet is arranged in the direction of a 5-degree included angle above the arc-shaped wing surface of the gas jet cleaning pipeline.
3. A shell and tube heat exchanger foulant on-line cleaning method according to claim 2, characterized in that: the liquid phase spraying and cleaning unit is of a switchable control structure and comprises an acid liquid subunit, a soaking liquid subunit, a protection liquid subunit and a clear water subunit.
4. A shell and tube heat exchanger fouling on-line cleaning method according to claim 3, characterized in that: the liquid-phase spraying cleaning pipeline is provided with liquid outlet holes, the opening direction of the liquid outlet holes is perpendicular to the tube bundle direction of the liquid-phase spraying cleaning pipeline, and the liquid spraying output speed of the liquid outlet holes is 2.59-5.21 m/s.
5. A shell and tube heat exchanger fouling on-line cleaning method according to claim 4, characterized in that: in a shell-and-tube heat exchanger, the axial flow velocity of fluid is 16-19 m/s.
6. A shell and tube heat exchanger fouling on-line cleaning method according to claim 5, characterized in that: the liquid in the acid liquid subunit is oxalic acid, acetic acid, hydrochloric acid, sulfuric acid or sulfamic acid.
7. A shell and tube heat exchanger fouling on-line cleaning method according to claim 6, characterized in that: the liquid of the soaking liquid subunit is a mixture of a dispersing chelating agent and a stripping agent;
the dispersing chelating agent is one or two of maleic acid-acrylic acid copolymer, hydroxypropyl acrylate, polyacrylic acid and 2-phosphonobutane L, 2, 4-carboxylic acid, and the concentration of the dispersing chelating agent is lOOmg/L-150 mg/L;
the stripping agent is one or two of dodecyl dimethyl benzyl ammonium chloride aqueous solution, tetradecyl dimethyl benzyl ammonium chloride, octadecyl dimethyl benzyl ammonium chloride, dodecyl dimethyl benzyl ammonium bromide and hexadecyl dimethyl (2-sulfurous acid) ethyl ammonium, and the concentration of the stripping agent is lOOmg/L-150 mg/L.
8. A shell and tube heat exchanger fouling on-line cleaning method according to claim 7, characterized in that: the protective liquid subunit is 1wt% sodium nitrite aqueous solution.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910948125.XA CN110595260B (en) | 2019-10-08 | 2019-10-08 | On-line cleaning method for dirt of shell-and-tube heat exchanger |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201910948125.XA CN110595260B (en) | 2019-10-08 | 2019-10-08 | On-line cleaning method for dirt of shell-and-tube heat exchanger |
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| CN110595260A true CN110595260A (en) | 2019-12-20 |
| CN110595260B CN110595260B (en) | 2021-03-23 |
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Cited By (2)
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| CN112451460A (en) * | 2020-12-31 | 2021-03-09 | 广州市医康生物科技有限公司 | Extraction method of crocus sativus extract and stretch mark removing cream containing extract |
| CN112516055A (en) * | 2020-12-31 | 2021-03-19 | 广州市医康生物科技有限公司 | Acne removing gel and preparation method thereof |
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