A kind of superheater and reheater anti-deposition type composite cleaning agent, device and method

Abstract

The invention discloses a superheater and reheater anti-deposition composite cleaning agent, and a device and a method thereof. The composite cleaning agent comprises phytic acid, citric acid, formicacid, polyacrylic acid, metasilicic acid and an organic corrosion inhibitor. The composite cleaning agent has the following advantages: above reagents are compounded to achieve significant synergisticeffects and a strong cleaning ability, the above cleaning formula has excellent anti-deposition and stable suspension performances, and the composite cleaning agent automatically forms a complete andcompact phytic acid-metal chelate on the inner wall of metal during cleaning, so the interface structure of the above cleaning medium and the inner wall of the metal is improved, and the corrosion rate is greatly reduced; high-content use of a dangerous anode or cathode or compounded corrosion inhibitor is avoided, and the dosage of the corrosion inhibitor is reduced; and the deposition amount issignificantly reduced, air locking and obstruction of superheater and reheater tubes are avoided, the tube explosion probability after cleaning is reduced, and the cleaning quality and the cleaning safety are improved.

Description

technical field [0001] The invention belongs to the technical field of chemical cleaning agents for small-diameter serpentine tube bundles such as superheaters, and in particular relates to a superheater and reheater cleaning agent, device and method. Background technique [0002] Affected by economics and technology, even if the supply water of industrial boilers adopts secondary desalinated water, scaling, corrosion, and salt accumulation in the thermal system still exist. Superheaters and reheaters are important heating surfaces for improving boiler thermal efficiency and reducing flue gas temperature. At that time, it circulates high-temperature and high-pressure water vapor inside, and high-temperature flue gas containing particulate matter and salt outside. According to the dissolution characteristics of soda and water on salt under different parameters, the steam is carried by dissolution or mechanically (steam drum furnace), and the salt in the steam will be in the s...

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Problems solved by technology

The problems existing during or after cleaning the superheater and reheater are highlighted as follows: the cost of chemicals is very high, and the cleaning cost is very high. The cleaning cost of a 350MW parameter boiler superheater reaches 3 to 4 million; the dissolution of the oxide skin by chemicals The ability needs to be improved, and there are still accidents of clogging during cleaning and pipe burst after cleaning; affected by the performance of the agent, the cleaning time is long

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