Method for cleaning spiral-plate heat exchanger

A heat exchanger and spiral plate technology, applied in the field of cleaning spiral plate heat exchangers, can solve problems such as difficult cleaning and dilute acid circulation, so as to prolong the service life, reduce equipment investment and labor costs, and improve heat exchange effect Effect

Active Publication Date: 2013-10-23
HUBEI SHUANGHUAN SCIENCE AND TECHNOLOGY STOCK CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The spiral plate heat exchanger is limited by the design of the equipment, and it is not easy to circulate dilute acid in the equipment after being dirty and blocked, so it is difficult to clean

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0015] A method for cleaning a spiral plate heat exchanger provided by the present invention comprises the following steps:

[0016] 1. The cooling circulating water of the spiral plate heat exchanger enters from the lower end and exits from the upper end. Firstly, a drain valve is added at the short connection of the inlet port at the lower end;

[0017] 2. Close the inlet valve of the cooling circulating water, open the drain valve, and then open the outlet valve of the cooling circulating water, and use the water pressure of the system to recoil and discharge the calcium and magnesium impurities such as mud that can be discharged from the equipment from the drain outlet;

[0018] 3. Close the cooling circulating water outlet valve and the drain valve, disconnect the short connection between the spiral plate heat exchanger and the outlet valve, and inject 300ml bis-imidazoline quaternary ammonium salt from the outlet end (determined according to the size of the heat exchange ...

Embodiment 2

[0026] A method for cleaning a spiral plate heat exchanger provided by the present invention comprises the following steps:

[0027] 1. The cooling circulating water of the spiral plate heat exchanger enters from the lower end and exits from the upper end. Firstly, a drain valve is added at the short connection of the inlet port at the lower end;

[0028] 2. Close the inlet valve of the cooling circulating water, open the drain valve, and then open the outlet valve of the cooling circulating water, and use the water pressure of the system to recoil and discharge the calcium and magnesium impurities such as mud that can be discharged from the equipment from the drain outlet;

[0029] 3. Close the cooling circulating water outlet valve and the drain valve, disconnect the short connection between the spiral plate heat exchanger and the outlet valve, and inject 400ml of heptadecenyl imidazoline quaternary ammonium salt from the outlet end (according to the size of the heat exchange...

Embodiment 3

[0037] A method for cleaning a spiral plate heat exchanger provided by the present invention comprises the following steps:

[0038] 1. The cooling circulating water of the spiral plate heat exchanger enters from the lower end and exits from the upper end. Firstly, a drain valve is added at the short connection of the inlet port at the lower end;

[0039] 2. Close the inlet valve of the cooling circulating water, open the drain valve, and then open the outlet valve of the cooling circulating water, and use the water pressure of the system to recoil and discharge the calcium and magnesium impurities such as mud that can be discharged from the equipment from the drain outlet;

[0040] 3. Close the cooling circulating water outlet valve and the drain valve, disconnect the short connection between the spiral plate heat exchanger and the outlet valve, and inject 450ml of carboxyethyl amphoteric imidazoline from the outlet end (determined according to the size of the heat exchange ar...

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PUM

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Abstract

The invention discloses a method for cleaning a spiral-plate heat exchanger, which comprises the steps that: firstly, cooling circulating water enters the spiral-plate heat exchanger to be permeated. Secondly, inhibitor is injected, and water is added in the spiral-plate heat exchanger to keep a container in an overflow state and control flow rate of a blowdown valve. Thirdly, acid liquor is lead out to a cooling circulating water outlet of the spiral-plate heat exchanger, and a water pipe is added, thereby controlling quality percentage concentration of the acid liquor on the cooling circulating water outlet. Fourthly, the blowdown valve is opened, the flow rate of the blowdown valve is controlled to lead dilute acid liquor to directly contact with a device body, an acid liquor valve is closed, and a water pipe replacement heat exchanger is turned up until water from the blowdown valve becomes neutral. The method for cleaning the spiral-plate heat exchanger uses permeable reaction and a method of bringing out solution, solves the difficult problem that the spiral-plate heat exchanger is difficult to clean, prolongs life of the spiral-plate heat exchanger, and greatly reduces equipment investment and labor cost brought by replacement of equipment.

Description

technical field [0001] The invention relates to a cleaning method for equipment descaling, in particular to a method for cleaning a spiral plate heat exchanger. Background technique [0002] At present, in the process of using tube-and-tube heat exchangers such as vacuum salt production, since calcium and magnesium impurities adhere to the tube wall during the use of the heat exchanger and affect the heat exchange effect, corrosion inhibitors are mostly used to protect the steel. After making the equipment, use 3-5% hydrochloric acid or sulfuric acid to descale. The cleaning method is to circulate dilute acid solution in the equipment to make calcium and magnesium impurities and dilute acid react into water-soluble calcium chloride, magnesium chloride or Calcium Sulfate Magnesium Sulfate. The spiral plate heat exchanger is limited by the design of the equipment, and the dilute acid is not easy to circulate in the equipment after being dirty and blocked, and it is difficult ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): F28G5/00
Inventor 蒋远华杨晓勤张道红何原武丽华许小三
Owner HUBEI SHUANGHUAN SCIENCE AND TECHNOLOGY STOCK CO LTD
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