CN105983556B - Cleaning method of water temperature machine - Google Patents
Cleaning method of water temperature machine Download PDFInfo
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- CN105983556B CN105983556B CN201510087614.2A CN201510087614A CN105983556B CN 105983556 B CN105983556 B CN 105983556B CN 201510087614 A CN201510087614 A CN 201510087614A CN 105983556 B CN105983556 B CN 105983556B
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Abstract
The cleaning method of the water temperature machine comprises the following steps: a water tank cleaning step: adding a corrosion inhibitor with the concentration of 0.3-0.5%, hydrochloric acid with the concentration of less than 5% and sodium fluoride with the concentration of 0.3-0.5% for circularly cleaning for a preset time at 45-55 ℃; a pipeline cleaning step: adding 5-10% by mass of hydrochloric acid, and circularly cleaning for 2-3 hours; adding 1-3% by mass of ammonia water and 0.6-0.7% by mass of ammonium persulfate, and cleaning for 4-6 hours; after the cleaning waste liquid is removed, adding citric acid with the mass fraction of 0.1-0.3% for rinsing for a preset time. The invention can effectively clean the scale in the water tank of the water temperature machine and the scale in the pipeline, thereby improving the heat conduction capability of the water temperature machine and prolonging the service life.
Description
Technical Field
The invention relates to the field of cleaning of water temperature machines, in particular to a water tank for efficiently cleaning a water temperature machine and a cleaning method of a pipeline.
Background
The water temperature machine is a main heating device on a production line, and mainly adopts electric heating to drive the temperature of water in a water tank to rise so as to generate circulation and then carry out centralized heating on equipment needing to be heated. However, due to long-time heating and heat supply, the scaling phenomenon occurs inside the copper pipe, so that the conduction of the water flow speed and the temperature is seriously influenced; moreover, the function of the water temperature machine is reduced, and particularly, the water temperature machine is provided with equipment at the tail end of the water supply, and almost no hot water flows in. However, in the conventional washing, people only concentrate in the water temperature machine, such as a water tank. The inside of the copper pipe is not cleaned, so that the water temperature machine is not cleaned thoroughly, and the problem cannot be solved fundamentally.
Therefore, there is a need for an improved method of cleaning a water chiller to overcome the above drawbacks.
Disclosure of Invention
The invention aims to provide a cleaning method of a water temperature machine, which can effectively clean scale in a water tank of the water temperature machine and scale inside a pipeline, thereby improving the heat conduction capability of the water temperature machine and prolonging the service life of the water temperature machine.
In order to achieve the purpose, the cleaning method of the water temperature machine comprises the following steps:
a water tank cleaning step: adding a corrosion inhibitor with the concentration of 0.3-0.5%, hydrochloric acid with the concentration of less than 5% and sodium fluoride with the concentration of 0.3-0.5% for circularly cleaning for a preset time at 45-55 ℃;
a pipeline cleaning step: adding 5-10% by mass of hydrochloric acid, and circularly cleaning for 2-3 hours; adding 1-3% by mass of ammonia water and 0.6-0.7% by mass of ammonium persulfate, and cleaning for 4-6 hours; after the cleaning waste liquid is removed, adding citric acid with the mass fraction of 0.1-0.3% for rinsing for a preset time.
Compared with the prior art, the cleaning method of the water temperature machine not only can clean the inside of the water tank of the water temperature machine, but also can remove scales in pipelines such as copper wires, thereby improving the heat conduction performance of the water temperature machine, improving the working efficiency and prolonging the service life of equipment.
As a preferred embodiment, the water tank cleaning step specifically includes: adding the corrosion inhibitor and the cosolvent into a cleaning loop filled with water, and circulating for 30-40 minutes; and adding the hydrochloric acid and the sodium fluoride for circularly cleaning for 4-6 hours.
Preferably, before adding the corrosion inhibitor, the method further comprises the following steps: flushing the water tank with demineralized water; and detecting the pressure and temperature within the water tank.
Preferably, after the hydrochloric acid and the sodium fluoride are added for cleaning, the method further comprises the following steps: demineralized water was added to top drain the pickling effluent until the conductivity in the tank was less than 50 uS/CM.
As another embodiment, the pipeline cleaning step specifically includes:
adding hydrochloric acid with the mass fraction of 5-10% for circular cleaning, and adding sodium ascorbate to adjust the concentration of Fe3+ in the solution to be less than 300 mg/L;
washing with demineralized water for 60-80 minutes;
adding the ammonia water and the ammonium persulfate, and cleaning at 30-40 ℃; and
and (3) after the cleaning waste liquid is removed, adding the citric acid, cleaning at 70-80 ℃, adding ammonia water to adjust the pH value to 3.5-4, and rinsing for 4-5 hours.
As another embodiment, the method further comprises after the pipeline cleaning step: and (5) passivating. Preferably, the passivation treatment step includes: adding 1.0-2.0% of sodium nitrite and 0.5-0.8% of passivating agent, and circularly cleaning for 4-6 hours at 50-60 ℃.
Preferably, the method further comprises the step of adding ammonia water to adjust the pH value to 9-10.
Detailed Description
The following examples are provided to further illustrate the cleaning method of the water temperature machine of the present invention, but the present invention is not limited thereto.
One embodiment of the cleaning method of the water temperature machine comprises a water tank cleaning step and a pipeline cleaning step, and specifically comprises the following steps:
a water tank cleaning step: adding a corrosion inhibitor with the concentration of 0.3-0.5%, hydrochloric acid with the concentration of less than 5% and sodium fluoride with the concentration of 0.3-0.5% for circularly cleaning for a preset time at 45-55 ℃;
a pipeline cleaning step: adding 5-10% by mass of hydrochloric acid, and circularly cleaning for 2-3 hours; adding 1-3% by mass of ammonia water and 0.6-0.7% by mass of ammonium persulfate, and cleaning for 4-6 hours; after the cleaning waste liquid is removed, adding citric acid with the mass fraction of 0.1-0.3% for rinsing for a preset time.
By the cleaning method, not only the inside of the water tank of the water temperature machine is cleaned, but also scales in a pipeline such as a copper wire are removed, so that the heat conduction performance of the water temperature machine is improved, and the service life of the equipment is prolonged.
A preferred embodiment of the cleaning method of the water temperature machine of the present invention includes a tank cleaning step, a line cleaning step, and a passivation treatment step. In this embodiment, a cleaning pump having a flow rate of 200 cubic meters per hour and a head of 0.78MPa is used in the tank cleaning step and the line cleaning step, respectively, but not limited thereto. The specific implementation of each step is described in detail below.
The water tank cleaning step comprises the following substeps:
pre-washing: the tank is flushed with demineralized water. Specifically, demineralized water is introduced into a water supply tank, the temperature of the water is 70-80 ℃, and the flow rate is 6-10 tons/hour. When the water is close to neutral and the water quality is clear by visual inspection, the flushing is stopped.
And (3) pressure and temperature detection: after the desalting water is washed, the highest pressure test is carried out on the system for 5 minutes, the temperature rise test is carried out after the water tank is confirmed to be free of leakage, and the temperature is controlled to be not lower than 40 ℃. This detection step is used to detect whether the fouling in the system has caused damage to the fuselage.
Pre-inhibition: adding a corrosion inhibitor with the concentration of 0.3-0.5% and a cosolvent with the concentration of 0.3-0.5% into a cleaning loop filled with water, and circulating for 30-40 minutes. Specifically, when the water in the water pump reaches 50 ℃, adding a corrosion inhibitor and a cosolvent, circulating for 30 minutes, and then adding acid to perform the subsequent acid washing step.
Acid washing: adding hydrochloric acid with the concentration of less than 5% and sodium fluoride with the concentration of 0.3% -0.5%, and circularly cleaning for 4-6 hours at 45-55 ℃. Specifically, it is preferable that the rinsing is carried out for 5 hours. Through this pickling step, the water tank is substantially cleaned of scale.
And 4, top discharging the desalted water. And after the acid washing is finished, discharging the top acid of the system by using desalted water. The spent acid liquid was ejected and the rinse was continued until the conductivity was less than 50 uS/CM. Preferably, if the pH is less than 8, the pH can be adjusted to 8 or above with ammonia. So far, the tank cleaning step is finished.
The pipeline cleaning step comprises the following substeps:
acid washing: adding hydrochloric acid with the mass fraction of 5-10% for circular cleaning, and adding sodium ascorbate to adjust Fe in the solution3+Is less than 300 mg/L. concretely, hydrochloric acid is added and the temperature is kept at about 50 ℃, and the circular cleaning is carried out for 2-3 hours, thereby preventing the serious corrosion caused by the overhigh concentration of the acid inlet and the incomplete cleaning caused by the overlow concentration of the acid at the outlet3+) Content, to a concentration p (Fe3+)<300mg/L。
And (3) regular detection: detecting once every 30 minutes in the pickling process, recording the acid mass fraction and the iron ion concentration, and finishing pickling when the iron ion concentration and the acid mass fraction of the circulating cleaning do not obviously change.
Washing with demineralized water: and flushing the mixture for 60-80 minutes by using desalted water.
Ammonia liquid cleaning: adding 1-3% ammonia water and 0.6-0.7% ammonium persulfate, and cleaning at 30-40 deg.C for 4-6 hr. Specifically, the mass fraction of the ammonia water is preferably 1.5%, the cleaning temperature is controlled to be 30-40 ℃, and the cleaning time is 5 hours.
And rinsing, namely adding 0.1-0.3% by mass of citric acid to clean at 70-80 ℃ after removing cleaning waste liquid, adding ammonia water to adjust the pH value to 3.5-4, and rinsing for 4-5 hours.
Passivating treatment: adding 1.0-2.0% of sodium nitrite and 0.5-0.8% of passivating agent, and circularly cleaning for 4-6 hours at 50-60 ℃. Preferably, ammonia is added in this step to adjust the pH value to 9-10. After the passivation step, a compact passivation protective film is formed on the inner wall of the copper wire, so that the cleaned active metal is prevented from being oxidized again.
In summary, the cleaning method of the water temperature machine of the invention not only cleans the inside of the water tank of the water temperature machine, but also removes the scale in the pipeline such as copper wire, thereby improving the heat conduction performance of the water temperature machine, improving the working efficiency and prolonging the service life of the equipment.
The above disclosure is only for the purpose of illustrating the preferred embodiments of the present invention, and it is therefore to be understood that the invention is not limited by the scope of the appended claims.
Claims (7)
1. A cleaning method of a water temperature machine comprises the following steps:
a water tank cleaning step: adding a cosolvent and a corrosion inhibitor with the concentration of 0.3-0.5% into a cleaning loop filled with water, and circulating for 30-40 minutes; adding hydrochloric acid with the concentration of less than 5% and sodium fluoride with the concentration of 0.3% -0.5% to circularly clean for 4-6 hours at 45-55 ℃;
a pipeline cleaning step: adding 5-10% by mass of hydrochloric acid, and circularly cleaning for 2-3 hours; adding 1-3% by mass of ammonia water and 0.6-0.7% by mass of ammonium persulfate, and cleaning for 4-6 hours; after the cleaning waste liquid is removed, adding citric acid with the mass fraction of 0.1-0.3% for rinsing for a preset time.
2. The method for cleaning a water temperature machine as claimed in claim 1, wherein: before the corrosion inhibitor is added, the method also comprises the following steps:
flushing the water tank with demineralized water; and
and detecting the pressure and the temperature in the water tank.
3. The method for cleaning a water temperature machine as claimed in claim 1, wherein: after the hydrochloric acid and the sodium fluoride are added for cleaning, the method also comprises the following steps: demineralized water was added to top drain the pickling effluent until the conductivity in the tank was less than 50 uS/CM.
4. The method for cleaning a water temperature machine as claimed in claim 1, wherein: the pipeline cleaning step specifically comprises:
adding hydrochloric acid with the mass fraction of 5-10% for circular cleaning, and adding sodium ascorbate to adjust Fe in the solution3+Is less than 300 mg/L;
washing with demineralized water for 60-80 minutes;
adding the ammonia water and the ammonium persulfate, and cleaning at 30-40 ℃; and
and (3) after the cleaning waste liquid is removed, adding the citric acid, cleaning at 70-80 ℃, adding ammonia water to adjust the pH value to 3.5-4, and rinsing for 4-5 hours.
5. The method for cleaning a water temperature machine as claimed in claim 1, wherein: also included after the line cleaning step is: and (5) passivating.
6. The method for cleaning a water temperature machine as claimed in claim 5, wherein: the passivation treatment step comprises: adding 1.0-2.0% of sodium nitrite and 0.5-0.8% of passivating agent, and circularly cleaning for 4-6 hours at 50-60 ℃.
7. The method for cleaning a water temperature machine as claimed in claim 6, wherein: and adding ammonia water to adjust the pH value to 9-10.
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| CN201510087614.2A CN105983556B (en) | 2015-02-25 | 2015-02-25 | Cleaning method of water temperature machine |
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| CN105983556B true CN105983556B (en) | 2020-07-17 |
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| JP2006043695A (en) * | 2004-07-08 | 2006-02-16 | Kao Corp | Cleaning method |
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| CN1152114A (en) * | 1995-12-15 | 1997-06-18 | 万小平 | Chemical cleaning process and special chemical for heating system |
| CN2638864Y (en) * | 2003-07-08 | 2004-09-08 | 张卫平 | Machine for cleaning water tank |
| CN101498004A (en) * | 2008-11-21 | 2009-08-05 | 宁夏电力科技教育工程院 | Chemical scrubbing method for boiler |
| CN102529050B (en) * | 2010-12-31 | 2014-07-30 | 上海富亿德塑胶有限公司 | Heat exchange device for high gloss mold temperature controller |
| CN102303029A (en) * | 2011-07-15 | 2012-01-04 | 浙江开化同力电子科技有限公司 | Method for cleaning cooling water pipeline used for transformer |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| JP2006043695A (en) * | 2004-07-08 | 2006-02-16 | Kao Corp | Cleaning method |
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