Weak acid cleaner and application thereof to removal of GGH (gas-gas heater) hard scale

A weak acid cleaning agent and cleaning main agent technology, applied in the field of cleaning agents, can solve the problems of low cleaning efficiency and long cleaning cycle, and achieve the effects of high cleaning efficiency, short cleaning cycle and cost reduction

Inactive Publication Date: 2013-12-25
李从波
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  • Summary
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  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] In order to overcome the disadvantages of long cleaning cycle and low cleaning efficiency (scaling removal rate) of existing cle...

Method used

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Embodiment Construction

[0022] The present invention is described in further detail below in conjunction with embodiment.

[0023] A weakly acidic cleaning agent, which is composed of the following raw materials in mass percentage: main cleaning agent 20-30%, leavening agent 0.3-1.0%, builder 1-3%, metal corrosion inhibitor 0.1-1.0%, surface active Agent 0.5 ~ 1.0%, the balance is water.

[0024] In a preferred embodiment of the present invention, the cleaning main agent is one or more inorganic acids (such as dilute hydrochloric acid), and one or more acidic substances mixed with organic acids (such as oxalic acid, citric acid, etc.) The leavening agent is EDTA disodium salt; The builder is sodium nitrate or potassium nitrate; The metal corrosion inhibitor is any one of hexamethylenetetramine, thiourea, and propyl sulfide. A mixture of one or more; the surfactant is any one or more of OP-10, TX-10, fatty alcohol polyoxyethylene ether sodium phosphate monoester.

[0025] The preparation method of a...

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Abstract

The invention relates to a cleaner and discloses a weak acid cleaner. The weak acid cleaner comprises the following raw materials in percentage by mass: 20-30% of a main cleaner, 0.3-1.0% of a sweller, 1-3% of an auxiliary cleaner, 0.1-1.0% of a metal corrosion inhibitor, 0.5-1.0% of a surfactant and the balance of water. The invention further discloses a method for preparing the weak acid cleaner. Meanwhile, the invention discloses a method for removing GGH (gas-gas heater) hard scale by the weak acid cleaner. The weak acid cleaner can be used for thoroughly removing slightly soluble salt deposits such as sulfate and silicate in a GGH, does not corrode enamel, glass or the like, and does not have an adverse reaction when contacted with a human body; waste liquid after scale removal can be directly discharged into a wastewater treatment system of a power plant; the weak acid cleaner only needs to be used for removing the scale at normal temperature without being heated by steam, and is short in cleaning cycle and high in cleaning efficiency; the light transmittance reaches 100% and the scale removal rate is more than 98%; compared with a conventional GGH cleaner, the cost is reduced by more than 50%.

Description

technical field [0001] The invention relates to a cleaning agent, in particular to a weak acid cleaning agent for cleaning a GGH (Gas-Gas Heater, flue gas heat exchanger). Background technique [0002] GGH (Gas-Gas Heater, flue gas heat exchanger) is one of the main devices in the flue gas desulfurization system (FGD) of thermal power plants. Its function is to use the original flue gas to heat the desulfurized clean flue gas, so that the exhaust gas temperature reaches above the acid dew point, reduce the corrosion of the clean flue gas flue and chimney, and increase the diffusion of pollutants; The flue gas temperature of the absorption tower reduces the technological requirements for anti-corrosion in the tower. [0003] As an important device for wet desulfurization in thermal power plants, GGH is prone to scaling and clogging on the surface of its enamel heat transfer elements, resulting in an increase in operating differential pressure and an increase in the current o...

Claims

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Application Information

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IPC IPC(8): C11D1/72C11D1/79C11D3/60C11D3/04C11D3/20C11D3/33C11D3/28C11D3/34F28G9/00
Inventor 李从波
Owner 李从波
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