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Cleaning agent and cleaning process of GGH heat exchange component

A cleaning agent and process technology, applied in the field of chemical cleaning agents and cleaning processes, can solve the problems of poor descaling effect, high chemical cost, long cleaning time, etc., and achieve the effect of fast cleaning, low cost and effective cleaning

Active Publication Date: 2009-10-14
CHINA SHENHUA ENERGY CO LTD +3
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] In order to at least partially overcome the above-mentioned defects in the prior art such as long cleaning time, high cost of chemicals, and poor descaling effect, and eliminate fouling and clogging of GGH heat exchange elements, the present invention provides a new, fast and effective cleaning agent and cleaning process

Method used

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  • Cleaning agent and cleaning process of GGH heat exchange component

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0032] Use the following cleaning agents:

[0033] Alkaline cleaning solution contains 6%wtNaOH, 1%wtJFC, 1.5%wtHPMA, 0.5%wtl227, 0.5%wtPAA, and the rest of water; acidic cleaning solution contains 4%wtHCl, 0.3%wt XD-16, 1.0%wtJFC, 0.5% wt TH-241, 0.5% wt PASP, and balance water.

[0034] And adopt the following cleaning process:

[0035] High-pressure water washing→alkali washing step→high-pressure water washing→acid washing step.

[0036] The alkali washing step is static soaking at 75°C for 6.5 hours; the pickling step is static soaking at 55°C for 6.5 hours.

[0037] Completely cleared an area of ​​0.1m 2, The GGH heat exchange components with a thickness of 7mm are fouled, and a total of 500mL of alkaline cleaning solution and acid cleaning solution are consumed. The entire cleaning process takes about 13 hours in total.

Embodiment 2

[0039] Use the following cleaning agents:

[0040] Alkaline cleaning solution contains 2%wtNaOH, 1.5%wt fast penetrant T, 1.5%wtEDTA, 0.5%wt 1631, 0.5%wtPASP, and the rest of water; acidic cleaning solution contains 3%wtHCl, 0.3%wtBTA, 1.0% wtJFC, 0.5% wt TH-3100, 0.5% wt PESA, and the balance water.

[0041] And adopt the following cleaning process:

[0042] High-pressure water washing→alkali washing step→high-pressure water washing→acid washing step.

[0043] The alkaline washing step is statically soaked at 70°C for 5 hours; the pickling step is statically soaked at 50°C for 5 hours.

[0044] Completely cleared an area of ​​0.1m 2 , The GGH heat exchange components with a thickness of 6mm are fouled, and a total of 500mL of alkaline cleaning solution and acid cleaning solution are consumed. The entire cleaning process takes about 10 hours in total.

Embodiment 3

[0046] Use the following cleaning agents:

[0047] Alkaline cleaning solution contains 10%wtNaOH, 0.8%wtJFC, 1.5%wtHPMA, 0.5%wtM-9, 0.5%wtPAAS, and the rest of water; acidic cleaning solution contains 5%wtHCl, 0.3%wtMBT, 1.0%wtJFC, 0.5 %wt POCA, 0.5%wt HPAA, and balance water.

[0048] And adopt the following cleaning process:

[0049] High-pressure water washing→alkali washing step→high-pressure water washing→acid washing step.

[0050] The alkali washing step is statically soaked at 80°C for 8 hours; the pickling step is statically soaked at 60°C for 8 hours.

[0051] Completely cleared an area of ​​0.1m 2 , The GGH heat exchange components with a thickness of 7mm are scaled, and a total of 500mL of alkaline cleaning solution and acid cleaning solution are consumed. The entire cleaning process takes about 16 hours in total.

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Abstract

The invention provides a cleaning agent and a cleaning method of a GGH heat exchange component applying the same. The cleaning agent comprises alkaline cleaning solution and acidic cleaning solution, wherein the alkaline cleaning solution contains 1.6 weight percent to 11.0 weight percent (wt, same below) of alkali, 0.7 to 2.4 of penetrating agent, 1.2 to 3.5 of scale dissolver, 0.3 to 1.2 of surfactant, 0.2 to 1.3 of remover b and the balance of water; and the acidic cleaning solution contains 2.6 to 5.5 of strong acid, 0.7 to 2.4 of penetrating agent, 0.3 to 1.2 of latent solvent, 0.2 to 0.6 of inhibitor, 0.2 to 1.3 of remover a, and the balance of water. The washing process comprises an alkaline cleaning step, an acid cleaning step and a high-pressure water flushing step between the alkaline cleaning step and the acid cleaning step. The cleaning process and the cleaning agent of the GHH heat exchange component have the advantages of quick and thorough cleaning, low cost, environmental protection, and the like.

Description

technical field [0001] The invention relates to a chemical cleaning agent and a cleaning process, in particular to a chemical cleaning agent and a cleaning process for heat exchange components of a flue gas-gas heat exchanger (GGH). Background technique [0002] The flue gas in the desulfurization equipment GGH brings a large amount of gypsum slurry or soot from the desulfurization tower or the original flue gas. When encountering a wet rotor with a large amount of deposition on the surface of the heat transfer element, serious ash plugging will occur. In order to ensure normal production, it is necessary to clean the scale on the surface of the GGH heat exchange element and restore the flow channel of the flue gas in the GGH heat exchange element. For this reason, GGH is often equipped with a soot blower for daily purging, and high-pressure water is used as the dredging of the serious blockage of the rotor. However, this kind of high-pressure water washing during operation...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C11D7/36B01D53/50B01D53/80C11D7/06C11D7/08C11D7/32
Inventor 毛迅孙志春王顶辉李建定甘超齐张祥金周洪光龙国军邓宇强刘冰李志刚刘毅曹文荪张千庄文军高小春余鹏安鸿
Owner CHINA SHENHUA ENERGY CO LTD
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