Method for cleaning heat exchangers

A technology of heat exchanger and alkali cleaning, which is applied in the direction of chemical instruments and methods, flushing, detergent composition, etc., can solve the problems of untimely dosing, low efficiency, corrosion, etc., and achieve the effect of short cleaning time and good effect

Inactive Publication Date: 2016-10-19
SAE TECH DELEVOPMENT DONGGUAN
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, due to the untimely dosing, insufficient circulation, and even incomplete drainage, the scale and corrosion of the equipment are caused to varying degrees, and regular cleaning is required.
The current cleaning method is difficult to obtain a good cleaning effect, and the efficiency is low

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment Construction

[0018] The cleaning method of the heat exchanger of the present invention will be further described below in conjunction with the examples, but the present invention is not limited thereby.

[0019] The cleaning method of the heat exchanger of the present invention adopts a chemical cleaning method, which adopts two cleaning pumps with a flow rate of 200 cubic meters per hour and a head of 0.78 MPa. But it is not limited to this.

[0020] A preferred embodiment of the cleaning method of the heat exchanger of the present invention will be described in detail below. The method comprises the following steps: alkali washing step, pickling step, rinsing step and passivation step.

[0021] In the alkaline cleaning step, an alkaline degreaser is used as the main chemical for cleaning. Preferably, the alkaline degreasing agent is XDA5. Specifically, dilute the alkaline degreasing agent XDA5 with water to make an alkali washing solution with a mass concentration of 0.5% to 1%, then ...

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PUM

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Abstract

The invention provides a method for cleaning heat exchangers. The method comprises a step of alkali wash: alkaline degreaser and antifoam agent are added and cyclic cleaning is performed for a first preset duration under 40 to 50 DEG C; a step of acid wash: an acid wash solution comprising nitric acid with mass fraction of 2% - 4%, citric acid with mass fraction of 0.5%-1%, glycollic acid with mass fraction of 1%-2.5%, HEDP with mass fraction of 0.5%-1%, sulfated oil with mass fraction of 0.3%-0.5% and balance of water is prepared; the acid wash solution is added after the alkali wash waste solution is discharged and cyclic cleaning is performed for a second preset duration under 50 to 60 DEG C. The provided method has good cleaning effect and short cleaning time.

Description

technical field [0001] The invention relates to a cleaning method for a circulating water cooling system, in particular to a cleaning method for a heat exchanger in the circulating water cooling system. Background technique [0002] The circulating water cooling system is a system for cooling and water quality treatment of the cooling water recycled in the industrial sector. The recycled cooling water is called circulating water. In the process of cooling production equipment or products, the temperature of the cooling water rises. Although its physical properties do not change much, after long-term recycling, some dissolved substances in the water will condense or disappear. The accumulation of dust and the growth of microorganisms will cause scale deposition in equipment and pipelines or corrosion of metal equipment and pipelines. Especially on the surface of the transducer, there will be a large amount of sediment attached, which will greatly reduce the conduction effici...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): F28G9/00C23C22/68C23C22/60C11D7/60C11D7/36
Inventor 金志民
Owner SAE TECH DELEVOPMENT DONGGUAN
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