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Cleaning method for heat exchanger

A heat exchanger and acid technology, applied in chemical instruments and methods, flushing, detergent compositions, etc., can solve the problems of corroding equipment, damage, affecting the heating performance of equipment, etc., to avoid damage and accelerate descaling. Effect

Inactive Publication Date: 2012-06-27
无锡中彩科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The traditional cleaning method of the heater is mostly mechanical and high-pressure water. The defect of this cleaning method is that the equipment will be damaged or corroded during the treatment, which will affect the heating performance of the equipment.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0012] Embodiment one: a cleaning method for a heat exchanger, comprising the following process steps:

[0013] (1) Preparation of acid solution and lye solution: Weigh nitric acid, hydrochloric acid, citric acid and mix them respectively. The mixing temperature is 40°C to obtain acid solution. 5%; Potassium hydroxide and ammonium fluoride were weighed respectively, mixed with water, and the mixing temperature was 50°C to obtain lye, the concentration of potassium hydroxide was 100g / L, and the concentration of ammonium fluoride was 10g / L;

[0014] (2) Cleaning: Put the acid solution into the heater through the circulating pump for full cleaning, the cleaning temperature is 40°C, the cleaning time is 40 minutes, and the acid circulation flow rate is 4m 3 / hour; discharge the acid solution after cleaning; then pump the lye into the heater through the circulating pump, and fully clean it. The cleaning temperature is 50°C, the cleaning time is 2 hours, and the lye circulation flo...

Embodiment 2

[0015] Embodiment two: a cleaning method for a heat exchanger, comprising the following process steps:

[0016] (1) Preparation of acid solution and lye solution: Weigh nitric acid, hydrochloric acid and citric acid respectively and mix them at a temperature of 50°C to obtain acid solution. The concentration of nitric acid is 12%, the concentration of hydrochloric acid is 12%, and the concentration of citric acid 6%; Potassium hydroxide and ammonium fluoride were weighed respectively, mixed with water, and the mixing temperature was 60°C to obtain lye, the concentration of potassium hydroxide was 120g / L, and the concentration of ammonium fluoride was 12g / L;

[0017] (2) Cleaning: Pour the acid solution into the heater through the circulation pump for full cleaning. The cleaning temperature is 50°C, the cleaning time is 30 minutes, and the circulation flow rate of the acid solution is 6m 3 / hour; after cleaning, discharge the acid solution; then put the lye into the heater thr...

Embodiment 3

[0018] Embodiment three: a cleaning method for a heat exchanger, comprising the following process steps:

[0019] (1) Preparation of acid solution and lye solution: Weigh nitric acid, hydrochloric acid, citric acid and mix them respectively, the mixing temperature is 45°C to obtain acid solution, the concentration of nitric acid is 11%, the concentration of hydrochloric acid is 11%, the concentration of citric acid 5.5%; Potassium hydroxide and ammonium fluoride were weighed respectively, mixed with water, and the mixing temperature was 55°C to obtain lye, the concentration of potassium hydroxide was 110g / L, and the concentration of ammonium fluoride was 11g / L;

[0020] (2) Cleaning: Pour the acid solution into the heater through the circulation pump for full cleaning. The cleaning temperature is 45°C, the cleaning time is 35 minutes, and the circulation flow rate of the acid solution is 5m 3 / hour; discharge the acid solution after cleaning; then pump the lye into the heater...

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PUM

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Abstract

The invention relates to a cleaning method for a heat exchanger. The cleaning method includes technological steps of (1), respectively weighing and mixing nitric acid, hydrochloric acid and critic acid to obtain acid liquor, and respectively weighing potassium hydroxide and ammonium fluoride and mixing the potassium hydroxide and the ammonium fluoride with water to obtain alkali liquor; (2), infiltrating the acid liquor into a heater via a circulating pump, sufficiently cleaning the heater for 30 to 40 minutes at the cleaning temperature ranging from 40 DEG C to 50 DEG C, draining the acid liquor after cleaning, then infiltrating the alkali liquor into the heater by the circulating pump, sufficiently cleaning the heater for 1 to 2 hours at the cleaning temperature ranging from 50 DEG C to60 DEG C, and scouring the heater by fresh water after the alkali liquor is drained. The circulation flow of the acid liquor ranges from 4m3 / hour to 6m3 / hour, and circulation flow of the alkali liquor ranges from 4m3 / hour to 6m3 / hour. The cleaning method has the advantages that the nitric acid, the hydrochloric acid and the critic acid with certain proportions can be reacted with scale but cannotbe reacted with the inner wall of the heater due to insufficient acidity, and equipment is prevented from being damaged; and the potassium hydroxide and the alkali liquor can be sufficiently reacted with a part of the scale and further can be reacted with salt generated after the previous acidic reaction, and descaling is accelerated.

Description

technical field [0001] The invention relates to a cleaning method for a heat exchanger, in particular to a cleaning method for a heat exchanger used in polysilicon production. Background technique [0002] In the polysilicon production process, due to various reasons, the dirt generated in the heat exchanger will cause the equipment and pipelines to fail, the production of the device system will decrease, and the energy consumption and material consumption will increase. The process is interrupted, and the device system is forced to stop production, which directly causes various economic losses, and even a vicious production accident may occur. [0003] The traditional cleaning method of the heater is mostly mechanical and high-pressure water. The defect of this cleaning method is that the equipment will be damaged or corroded during the treatment process, which will affect the heating performance of the equipment. Contents of the invention [0004] The purpose of the pre...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): F28G9/00C11D7/10C11D7/26C11D7/60
Inventor 孙建荣顾豪杰张晓春
Owner 无锡中彩科技有限公司
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