CN108620383B - Method for improving cleaning effect of color coating unit - Google Patents

Method for improving cleaning effect of color coating unit Download PDF

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Publication number
CN108620383B
CN108620383B CN201810337257.4A CN201810337257A CN108620383B CN 108620383 B CN108620383 B CN 108620383B CN 201810337257 A CN201810337257 A CN 201810337257A CN 108620383 B CN108620383 B CN 108620383B
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tank
cleaning
color coating
coating unit
cleaning solution
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CN108620383A (en
Inventor
周小舟
任玉苓
胡松
蒲卫东
刘星
秦杰
张润桥
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Wuhan Iron and Steel Co Ltd
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Wuhan Iron and Steel Co Ltd
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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B08—CLEANING
    • B08B—CLEANING IN GENERAL; PREVENTION OF FOULING IN GENERAL
    • B08B3/00—Cleaning by methods involving the use or presence of liquid or steam
    • B08B3/04—Cleaning involving contact with liquid
    • B08B3/08—Cleaning involving contact with liquid the liquid having chemical or dissolving effect
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B08—CLEANING
    • B08B—CLEANING IN GENERAL; PREVENTION OF FOULING IN GENERAL
    • B08B3/00—Cleaning by methods involving the use or presence of liquid or steam
    • B08B3/04—Cleaning involving contact with liquid
    • B08B3/10—Cleaning involving contact with liquid with additional treatment of the liquid or of the object being cleaned, e.g. by heat, by electricity or by vibration
    • B08B3/106—Cleaning involving contact with liquid with additional treatment of the liquid or of the object being cleaned, e.g. by heat, by electricity or by vibration by boiling the liquid
    • C—CHEMISTRY; METALLURGY
    • C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
    • C23G—CLEANING OR DE-GREASING OF METALLIC MATERIAL BY CHEMICAL METHODS OTHER THAN ELECTROLYSIS
    • C23G1/00—Cleaning or pickling metallic material with solutions or molten salts
    • C23G1/02—Cleaning or pickling metallic material with solutions or molten salts with acid solutions

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  • Chemical & Material Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • General Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Materials Engineering (AREA)
  • Mechanical Engineering (AREA)
  • Metallurgy (AREA)
  • Organic Chemistry (AREA)
  • Application Of Or Painting With Fluid Materials (AREA)
  • Cleaning By Liquid Or Steam (AREA)
  • Coating Apparatus (AREA)

Abstract

A method for improving the cleaning effect of a color coating unit comprises the following steps: preparing a cleaning solution; placing the prepared cleaning liquid into each tank of a color coating unit; starting a circulating pump and a heater in the unit; cleaning solution circulates in the tank for 2-3 hours and then is discharged; injecting clear water to the normal working liquid level of the tank body, circulating for 30 minutes, emptying the tank liquid, and then washing the tank body by using deionized water; and performing other preparation work before normal operation on the unit until the unit completely meets the normal operation condition. The invention can thoroughly remove a large amount of silt and residue accumulated in a groove and a pipeline in a color coating unit, reduce labor intensity and stabilize the surface quality of a color coated steel plate, the rate of judging the poor performance of the color coated steel plate is about 4 percent before the method is adopted due to poor cleaning effect, and the rate of judging the performance is reduced to be within 1 percent after the method is adopted for cleaning, so that the qualification rate is at least 3 percent higher than the premise.

Description

Method for improving cleaning effect of color coating unit
Technical Field
The invention relates to a cleaning method of a device, and particularly belongs to a method for improving the cleaning effect of a color coating unit.
Background
The color coated steel plate does not need chemical anti-corrosion treatment, spraying and other processes, can completely coat VOC waste gas emission and heavy metal-containing waste water and waste residue emission, is a novel material which is environment-friendly, energy-saving and easy to machine and form, and is widely applied to the fields of buildings, household appliances, decoration and the like.
With the continuous development of the application of the color coated steel plate in the market, the color coated steel plate is directly used in large scale in the aspects of light steel buildings, house structures, high-rise curtain walls and the like. However, these fields of use are also increasingly critical with regard to their product quality, such as their cycle time, surface quality. In the production process of the color-coated sheet, the cleaning effect of the cleaning section on the strip steel directly influences various performance indexes of the product.
In the prior art, color coating units are produced by adopting a conventional two-coating and two-baking process. After the unit is continuously produced for a certain time, a large amount of silt and residues are accumulated in the pretreatment tank and the pipeline, and if the sludge and the residues are not cleaned in time, the concentration of effective free alkali in the alkali washing tank is reduced, so that the capability of removing grease is influenced; the heat exchanger is attached in a heat exchanger pipeline, so that the capacity of the heat exchanger is reduced, and the working temperature of the tank liquor is difficult to reach a set value; and the spray pipe and the spray beam nozzle can be blocked, so that the surface of the strip steel can not be fully washed. And because the residues and the sludge have easy adhesiveness, the cleaning not only causes large labor intensity of cleaning personnel, but also is not easy to clean, and causes pollution to the color-coated steel plate, thereby directly influencing the coating effect of the unit and the comprehensive performance of a final product. And further leads to a reduction in yield. Because the color coating unit is generally a continuous production unit and has short shutdown and fixed repair time, the current cleaning mode is to carry out manual removal of scale substances and flushing and cleaning by using a flexible water pipe by manually carrying out 6-8 hours per week shutdown and fixed repair time, and the decontamination effect is not ideal.
Through search, the technical measure which is not found by the manufacturers in the technical field to solve the problem how to thoroughly remove a large amount of sludge and residues accumulated in the grooves and the pipelines in the color coating unit and the problem that the surface of the color coated steel plate is polluted.
Disclosure of Invention
The invention aims to overcome the defects of the prior art and provides a method for cleaning the color coating unit, which can thoroughly remove a large amount of scales, silt and residues accumulated in a groove and a pipeline in the color coating unit, reduce the labor intensity, improve the working efficiency, stabilize the surface quality of a color coated steel plate and improve the qualified rate of product performance by at least 3 percent compared with the premise.
The measures for realizing the aim are as follows:
a method for improving the cleaning effect of a color coating unit comprises the following steps:
1) preparing a cleaning solution: the cleaning solution comprises the following components in percentage by weight: phosphoric acid: 0.4-0.5% and the balance of deionized water;
2) placing the prepared cleaning liquid into each tank of a color coating unit, wherein the placing amount accounts for 40-60% of the capacity of each tank;
3) starting a circulating pump and a heater in the unit, controlling the temperature of cleaning liquid in each tank to be 40-50 ℃, and controlling the flow rateIn the range of 1.5-2 m3Min; controlling the pH value in the circulating cleaning solution to be 1.8-2.1; disassembling each nozzle, soaking in hydrochloric acid solution for 0.5-1 hr, and cleaning with artificial clear water and dredging;
4) circulating the cleaning solution in the tank for 2-3 hours, and discharging the circulating cleaning solution in each tank and the pipeline connected with each tank in the color coating unit;
5) injecting clear water to the normal working liquid level of the tank body, emptying the tank liquid after circulating for 30 minutes, washing the tank body with deionized water, detecting the washing water, and stopping flushing when the PH value of the washing water is 6-7 and the electric conductivity is less than or equal to 50 mus/cm;
6) and performing other preparation work before normal operation on the unit until the unit completely meets the normal operation condition.
Preferably: the amount of the cleaning liquid in each tank accounts for 42-50% of the capacity of each tank.
Preferably: the temperature of the cleaning liquid in each groove is 44-50 ℃.
Preferably: the content of phosphoric acid in the cleaning solution is 0.43-0.47%.
The function of each main process of the invention
The invention adopts the cleaning solution with the phosphoric acid content of 0.4-0.5 percent and the rest of deionized water, preferably the phosphoric acid content in the cleaning solution is 0.43-0.47 percent, because the phosphoric acid belongs to medium-strong acid and can be subjected to neutralization reaction with alkaline substances in a tank body, the phosphoric acid has weak volatility and causes less pollution to equipment and environment when in use, the phosphate radical ions have strong coordination capacity and can produce soluble complexes with a plurality of metal ions, for example, reactants such as nickel, cobalt and the like in the tank No. 4 can be dissolved in phosphoric acid, but before the invention, the cleaning is carried out by adopting clean water, instead of using phosphoric acid cleaning solution, because the acid is believed to react and corrode the metal tank body and the metal pipeline of the unit tank, however, through verification, the metal tank body and the pipeline react with alkali liquor to form an oxide film, and phosphoric acid with the concentration cannot corrode the metal tank body equipment.
The invention controls the cleaning liquid amount in each tank of the color coating unit to account for 40-60% of the capacity of each tank, preferably the cleaning liquid amount in each tank accounts for 42-50% of the capacity of each tank, because the cleaning liquid with the capacity can fully circulate and clean the tank body and the pipeline, the use amount of phosphoric acid can be reduced, and the cleaning cost is saved.
The temperature of the cleaning liquid in each tank is controlled to be 40-50 ℃, and preferably 44-50 ℃; the flow rate is 1.5-2 m3Min; this is because phosphoric acid has a crystallization point of 21 ℃ below which it will precipitate semi-aqueous crystals and fail, and if the temperature is too high, when it exceeds 50 ℃, the corrosive oxidation of phosphoric acid is greatly enhanced and corrosion of equipment may occur.
Compared with the prior art, the method can thoroughly remove a large amount of silt and residues accumulated in the groove and the pipeline in the color coating unit, reduce the labor intensity and stabilize the surface quality of the color coated steel plate, the improvement rate of poor performance of the color coated steel plate is about 4 percent due to poor cleaning effect before the method is adopted, and the performance improvement rate is reduced to be within 1 percent after the method is adopted for cleaning, so that the qualification rate is at least 3 percent higher than the prior art.
Detailed Description
The present invention is described in detail below:
example 1
A method for improving the cleaning effect of a color coating unit comprises the following steps:
1) preparing a cleaning solution: the cleaning solution comprises the following components in percentage by weight: phosphoric acid: 0.41 percent and the balance of deionized water;
2) placing the prepared cleaning liquid into each tank of a color coating unit, wherein the placing amount accounts for 50% of the capacity of each tank;
3) starting a circulating pump and a heater in the unit, controlling the temperature of the cleaning liquid in each tank at 46 ℃ and the flow rate at 1.7m3Min; controlling the pH value in the circulating cleaning solution to be 1.9; the nozzles are disassembled and then are put into hydrochloric acid solution to be soaked for 0.6 hour, and then the manual clean water is used for cleaning and dredging;
4) when the cleaning solution circulates in the tank for 2 hours, the circulating cleaning solution in each tank and the pipeline connected with each tank in the color coating unit is discharged;
5) injecting clear water to the normal working liquid level of the tank body, emptying the tank liquid after circulating for 30 minutes, then washing the tank body with deionized water, detecting washing water, and stopping flushing when the PH value of the washing water is 7 and the electric conductivity is 32 mus/cm;
6) and performing other preparation work before normal operation on the unit until the unit completely meets the normal operation condition.
Through detection, no sludge and residue remain in each groove and pipeline, only one nozzle is manually disassembled and cleaned, the produced color-coated steel plate is not polluted by the sludge and the residue, and the product performance qualification rate in the monthly production period after the machine is periodically overhauled and started is 99.1 percent.
Example 2
A method for improving the cleaning effect of a color coating unit comprises the following steps:
1) preparing a cleaning solution: the cleaning solution comprises the following components in percentage by weight: phosphoric acid: 0.48 percent, and the balance of deionized water;
2) placing the prepared cleaning liquid into each tank of a color coating unit, wherein the placing amount accounts for 43% of the capacity of each tank;
3) starting a circulating pump and a heater in the unit, controlling the temperature of the cleaning liquid in each tank at 41 ℃ and the flow rate at 1.5m3Min; controlling the pH value in the circulating cleaning solution to be 1.8; the nozzles are disassembled and then are put into hydrochloric acid solution to be soaked for 0.7 hour, and then the manual clean water is used for cleaning and dredging;
4) when the cleaning solution circulates in the tank for 2.5 hours, the circulating cleaning solution in each tank and the pipeline connected with each tank in the color coating unit is discharged;
5) injecting clear water to the normal working liquid level of the tank body, emptying the tank liquid after circulating for 30 minutes, then washing the tank body with deionized water, detecting washing water, and stopping flushing when the PH value of the washing water is 6 and the electric conductivity is 28 mus/cm;
6) and performing other preparation work before normal operation on the unit until the unit completely meets the normal operation condition.
Through detection, no sludge and residue remain in each groove and pipeline, only one nozzle is manually disassembled and cleaned, the produced color-coated steel plate is not polluted by the sludge and the residue, and the product performance qualification rate in the monthly production period after the machine is periodically overhauled and started is 98.8%.
Example 3
A method for improving the cleaning effect of a color coating unit comprises the following steps:
1) preparing a cleaning solution: the cleaning solution comprises the following components in percentage by weight: phosphoric acid: 0.43 percent, and the balance of deionized water;
2) placing the prepared cleaning liquid into each tank of a color coating unit, wherein the placing amount accounts for 45% of the capacity of each tank;
3) starting a circulating pump and a heater in the unit, controlling the temperature of the cleaning liquid in each tank at 43 ℃ and the flow rate at 1.6m3Min; controlling the pH value in the circulating cleaning solution to be 2.0; the nozzles are disassembled and then are put into hydrochloric acid solution to be soaked for 0.75 hour, and then the cleaning and dredging are carried out by artificial clear water;
4) when the cleaning solution circulates in the tank for 2.8 hours, the circulating cleaning solution in each tank and the pipeline connected with each tank in the color coating unit is discharged;
5) injecting clear water to the normal working liquid level of the tank body, emptying the tank liquid after circulating for 30 minutes, then washing the tank body with deionized water, detecting the washing water, and stopping flushing when the PH value of the washing water is 6.5 and the electric conductivity is 16 mus/cm;
6) and performing other preparation work before normal operation on the unit until the unit completely meets the normal operation condition.
Through detection, no sludge and residue remain in each groove and pipeline, only one nozzle is manually disassembled and cleaned, the produced color-coated steel plate is not polluted by the sludge and the residue, and the product performance qualification rate in the monthly production period after the machine is periodically overhauled and started is 99.3%.
Example 4
A method for improving the cleaning effect of a color coating unit comprises the following steps:
1) preparing a cleaning solution: the cleaning solution comprises the following components in percentage by weight: phosphoric acid: 0.49 percent and the balance of deionized water;
2) placing the prepared cleaning liquid into each tank of a color coating unit, wherein the placing amount accounts for 48% of the capacity of each tank;
3) starting a circulating pump and a heater in the unit, controlling the temperature of the cleaning liquid in each tank at 44 ℃ and the flow rate at 1.8m3Min; controlling the pH value in the circulating cleaning solution to be 1.9; disassembling each nozzle, soaking in hydrochloric acid solution for 1 hour, and cleaning with artificial clear water and dredging;
4) when the cleaning solution circulates in the tank for 3 hours, the circulating cleaning solution in each tank and the pipeline connected with each tank in the color coating unit is discharged;
5) injecting clear water to the normal working liquid level of the tank body, emptying the tank liquid after circulating for 30 minutes, then washing the tank body with deionized water, detecting washing water, and stopping flushing when the PH value of the washing water is 7 and the electric conductivity is 19 mus/cm;
6) and performing other preparation work before normal operation on the unit until the unit completely meets the normal operation condition.
Through detection, no sludge and residue remain in each groove and pipeline, only one nozzle is manually disassembled and cleaned, the produced color-coated steel plate is not polluted by the sludge and the residue, and the product performance qualification rate in the monthly production period after the machine is periodically overhauled and started is 99.0 percent.
Example 5
A method for improving the cleaning effect of a color coating unit comprises the following steps:
1) preparing a cleaning solution: the cleaning solution comprises the following components in percentage by weight: phosphoric acid: 0.47 percent and the balance of deionized water;
2) placing the prepared cleaning liquid into each tank of a color coating unit, wherein the placing amount accounts for 53 percent of the capacity of each tank;
3) starting a circulating pump and a heater in the unit, controlling the temperature of the cleaning liquid in each tank at 50 ℃ and the flow rate at 2m3Min; controlling the pH value in the circulating cleaning solution to be 2.1; disassembling each nozzle, soaking in hydrochloric acid solution for 0.55 hr, and cleaning with artificial clear water and dredging;
4) when the cleaning solution circulates in the tank for 2.2 hours, the circulating cleaning solution in each tank and the pipeline connected with each tank in the color coating unit is discharged;
5) injecting clear water to the normal working liquid level of the tank body, emptying the tank liquid after circulating for 30 minutes, then washing the tank body with deionized water, detecting washing water, and stopping flushing when the PH value of the washing water is 7 and the electric conductivity is 16 mus/cm;
6) and performing other preparation work before normal operation on the unit until the unit completely meets the normal operation condition.
Through detection, no sludge and residue remain in each groove and pipeline, only one nozzle is manually disassembled and cleaned, the produced color-coated steel plate is not polluted by the sludge and the residue, and the product performance qualification rate in the monthly production period after the machine is periodically overhauled and started is 99.1 percent.
Example 6
A method for improving the cleaning effect of a color coating unit comprises the following steps:
1) preparing a cleaning solution: the cleaning solution comprises the following components in percentage by weight: phosphoric acid: 0.47 percent and the balance of deionized water;
2) placing the prepared cleaning liquid into each tank of a color coating unit, wherein the placing amount accounts for 59% of the capacity of each tank;
3) starting a circulating pump and a heater in the unit, controlling the temperature of the cleaning liquid in each tank at 44 ℃ and the flow rate at 1.75m3Min; controlling the pH value in the circulating cleaning solution to be 1.9; disassembling each nozzle, soaking in hydrochloric acid solution for 0.9 hr, and cleaning with artificial clear water and dredging;
4) when the cleaning solution circulates in the tank for 2.6 hours, the circulating cleaning solution in each tank and the pipeline connected with each tank in the color coating unit is discharged;
5) injecting clear water to the normal working liquid level of the tank body, emptying the tank liquid after circulating for 30 minutes, then washing the tank body with deionized water, detecting the washing water, and stopping flushing when the PH value of the washing water is 6.5 and the electric conductivity is 36 mus/cm;
6) and performing other preparation work before normal operation on the unit until the unit completely meets the normal operation condition.
Through detection, no sludge and residue remain in each groove and pipeline, only one nozzle is manually disassembled and cleaned, the produced color-coated steel plate is not polluted by the sludge and the residue, and the product performance qualification rate in the monthly production period after the machine is periodically overhauled and started is 98.9%.
The present embodiments are merely preferred examples, and are not intended to limit the scope of the present invention.

Claims (4)

1. A method for improving the cleaning effect of a color coating unit comprises the following steps:
1) preparing a cleaning solution: the cleaning solution comprises the following components in percentage by weight: phosphoric acid: 0.4-0.49%, and the balance of deionized water;
2) placing the prepared cleaning liquid into each tank of a color coating unit, wherein the placing amount accounts for 40-60% of the capacity of each tank;
3) starting a circulating pump and a heater in the unit, controlling the temperature of cleaning liquid in each tank to be 41-50 ℃ and the flow rate to be 1.5-2 m3Min; controlling the pH value in the circulating cleaning solution to be 1.8-2.1; disassembling each nozzle, soaking in hydrochloric acid solution for 0.5-1 hr, and cleaning with artificial clear water and dredging;
4) circulating the cleaning solution in the tank for 2-3 hours, and discharging the circulating cleaning solution in each tank and the pipeline connected with each tank in the color coating unit;
5) injecting clear water to the normal working liquid level of the tank body, emptying the tank liquid after circulating for 30 minutes, then washing the tank body with deionized water, detecting the washing water, and stopping flushing when the PH value of the washing water is 6-7 and the electric conductivity is 16-50 mus/cm;
6) and performing other preparation work before normal operation on the unit until the unit completely meets the normal operation condition.
2. The method for improving the cleaning effect of the color coating unit according to claim 1, wherein the method comprises the following steps: the amount of the cleaning liquid in each tank accounts for 42-50% of the capacity of each tank.
3. The method for improving the cleaning effect of the color coating unit according to claim 1, wherein the method comprises the following steps: the temperature of the cleaning liquid in each groove is 44-50 ℃.
4. The method for improving the cleaning effect of the color coating unit according to claim 1, wherein the method comprises the following steps: the content of phosphoric acid in the cleaning solution is 0.43-0.47%.
CN201810337257.4A 2018-04-16 2018-04-16 Method for improving cleaning effect of color coating unit Active CN108620383B (en)

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CN110158072B (en) * 2019-04-30 2021-02-26 首钢京唐钢铁联合有限责任公司 Passivation region cleaning method

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CN1014909B (en) * 1987-08-28 1991-11-27 北京量具刃具厂 Cleaning technique for steel product before film-plating
US20040147422A1 (en) * 2003-01-23 2004-07-29 Hatch Andrew M. Cleaner composition for formed metal articles
CN105018241A (en) * 2015-08-20 2015-11-04 太仓市金鹿电镀有限公司 Method for cleaning metal ion pollutants on surface of ultrafiltration membrane and preparation method of cleaning solution used thereof
CN205587338U (en) * 2015-12-28 2016-09-21 浙江明泉工业涂装有限公司 Water -saving before painting handles belt cleaning device

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