Low corrosiveness cleaning agent used for boilers

Abstract

The invention discloses a low corrosiveness cleaning agent used for boilers. The low corrosiveness cleaning agent is composed of, by mass, 5 to 12 parts of ethylenediamine tetraacetic acid disodium salt, 0.02 to 0.05 part of polyoxyethylene octylphenol ether, 2 to 3 parts of polyacrylic acid, 5 to 10 parts of citric acid, 0.5 to 1 part of hydrogen peroxide, 0.01 to 0.05 part of ammonium thiocyanate, 0.1 to 0.3 part of urotropin, 0.04 to 0.1 part of thiourea, 0.05 to 0.1 part of benzyldimethylhexadecylammonium chloride, 0.05 to 0.1 part of sodium dodecyl benzene sulfonate, and pure water. The invention also provideds a preparation method of the low corrosiveness cleaning agent used for boilers, according to the preparation method, the low corrosiveness cleaning agent is obtained by putting the above ten ingredients into a stirred vessel at the mass ratio successively for stirring dissolving. The ten ingredients are combined at the mass ratio above, cleaning effect and corrosion inhibition effect on boilers are better than that exclusive use of any one of the ingredients, toxicity is low, environmental harm is less, and the low corrosiveness cleaning agent is capable of according with the requirements of sustainable development. The preparation method is simple; the raw materials are easily available; and operation is convenient.

Description

technical field [0001] The invention relates to a chemical preparation and a method for cleaning a boiler, in particular to a low-corrosion cleaning agent for a boiler and a preparation method thereof. Background technique [0002] In daily industrial production, boiler water is continuously circulated and concentrated during use, and the mineral content in the water will continue to increase, which will cause scaling and oxygen corrosion on the furnace wall and fire tube. Once scale is formed on the fire tube of the furnace wall, the heat exchange efficiency will be greatly reduced, and the boiler will accelerate oxygen corrosion. 3+ , Fe 2+ state, while Fe 3+ , Fe 2+ The electrochemical corrosion between , Fe, OH- ions is more serious. If things go on like this, the service life of the boiler will be shortened and the safe production will be endangered. Therefore, the furnace wall fire tube of the boiler must be treated regularly. Common types of scale include carbona...

AI Technical Summary

Problems solved by technology

The cleaning methods commonly used at present include the use of hydrochloric acid, citric acid, EDTA ammonium salt, hydrofluoric acid, sulfamic acid and sulfuric acid, etc., which need to include two major steps of cleaning, descaling and passivation including pickling, water washing and rinsing. , the cleaning time is long, the cleaning process is complex and consumes a large amount of desalinated water, and the amount of waste liquid is processed, it is difficult to fully meet the environmental protection requirements