Boiler decoking agent

Abstract

The invention relates to a boiler decoking agent. The boiler decoking agent is prepared from components in parts by weight as follows: 20-30 parts of aluminium nitrate, 15-25 parts of borax, 20-30 parts of copper nitrate, 10-20 parts of ammonium nitrate, 5-10 parts of ammonium bicarbonate, 6-10 parts of manganese dioxide, 10-15 parts of sodium citrate, 3-5 parts of sodium carbonate and 0.15-1 partof a rare earth additive. The boiler decoking agent has the following beneficial effects: pulverized coal combustion is promoted, and coking is reduced. Copper ions generated in the decoking agent can be subjected to a reaction with coal ash, so that ignition point of carbon deposit can be reduced, and pulverized coal combustion can be promoted; meanwhile, it is unexpectedly found that the reaction process is faster in presence of manganese dioxide, and the decoking effect is better under the synergy of manganese dioxide and copper nitrate. Under synergy of sodium citrate and the other components, exhaust gas can be removed and sulfur dioxide can be absorbed in advance in a hearth when sodium citrate is burnt with coal, besides, an absorption process is enhanced by a buffer action of sodium citrate, waste gas containing 500 ppm-5% of sulfur dioxide can be treated, the desulfurization degree is as high as 80%-90%, and the problem of secondary pollution is solved.

Description

technical field [0001] The invention relates to the field of chemical industry, in particular to a boiler decoking agent. Background technique [0002] Boiler coking is a relatively common problem in operation. Due to the high heat intensity and high combustion temperature of combustion boilers, under the influence of various responsible factors such as unreasonable boiler design or changes in coal quality, it is easy to form serious coking and ash accumulation. Coking is more serious during the high load period. Coking is a more harmful operation defect, which will cause the temperature to rise, make it difficult to operate the slag extractor and slag crusher, and sometimes large pieces of coke will fall from the furnace. The wall of the cold water pipe is smashed and water is sprayed from the pipe, causing hazards such as flameout and shutdown of the furnace. [0003] In particular, the coking of boilers in large-scale power plants is more serious, and manual decoking dur...

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Problems solved by technology

[0002] Boiler coking is a relatively common problem in operation. Due to the high heat intensity and high combustion temperature of combustion boilers, under the influence of various responsible factors such as unreasonable boiler design or changes in coal quality, it is easy to form serious coking and ash accumulation. Coking is more serious during the high load period. Coking is a more harmful operation defect, which will cause the temperature to rise, make it difficult to operate the slag extractor and slag crusher, and sometimes large pieces of coke will fall from the furnace. The wall of the cold water pipe is smashed and water is sprayed from the pipe, causing hazards such as flameout and shutdown

[0003] In particular, the coking of boilers in large-scale power plants is more serious, and manual decoking during operation is often required. If the coking is serious, the boiler will be shut down and manually decoked, which will seriously affect the safe operation of coal-fired power plants, increase the labor intensity of workers, and also affect the decoking. Jiao work has a great security risk

[0004] Existing liquid decoking agents volatilize rapidly under high temperature conditions, are incompatible with water and fire, and are difficult to effectively act on the coke body; while existing solid decoking agents are improperly selected and proportioned, causing damage to the metal pipe wall during use. It is corrosive, and at the same time, it cannot remove large and old coke while inhibiting and preventing the formation of new coke.

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