An additive for preventing high-alkali fuel from fouling and coking, its preparation method and application

Abstract

The invention relates to an additive for preventing high-alkaline fuel from being contaminated and coked and a preparation method and application thereof, and belongs to the technical field of combustion chemistry.The additive is prepared from, by mass, 5%-20% of aluminum compounds, 1%-15% of magnesium hydrate, 1%-5% of titanium dioxide, 0.01%-5% of a surfactant, 0.5%-15% of a dispersing agent and the balance water.When the additive is sprayed into a boiler, the additive can change the chemical components and physical structure of coke residues by participating in combustion, the ash fusion point is increased, contamination, coking and corrosion of the heated face of the boiler can be prevented or relieved, the boiler efficiency is improved, alkali metal steam released in the high-alkaline fuel combustion process can be effectively inhibited, no corrosion is generated to special steel of a supercritical large unit, an ultra-supercritical large unit and the like, the environment is not polluted, and the risks such as SCR catalyst poisoning do not exist.

Description

technical field [0001] The invention belongs to the technical field of combustion chemistry, and in particular relates to an additive for preventing contamination and coking of high-alkali fuel, its preparation method and application. Background technique [0002] Xinjiang has very rich coal resources and is very concentrated, accounting for about 40.5% of China's predicted total coal resources. These coals have the characteristics of high volatile content and low ash content. They seem to be excellent power fuels, but due to problems such as high sodium content , there are serious pollution and coking problems, and it is easy to cause boiler shutdown and coke cleaning accidents during the combustion process, which greatly limits the development of the coal power industry, resulting in a large amount of coal resources not being well and effectively utilized, resulting in a shortage of resources waste. At present, in order to reduce the pollution and coking of high-sodium co...

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Problems solved by technology

[0002] Xinjiang has very rich coal resources and is very concentrated, accounting for about 40.5% of China's predicted total coal resources. These coals have the characteristics of high volatile content and low ash content. They seem to be excellent power fuels, but due to problems such as high sodium content , there are serious pollution and coking problems, and it is easy to cause boiler shutdown and coke cleaning accidents during the combustion process, which greatly limits the development of the coal power industry, resulting in a large amount of coal resources not being well and effectively utilized, resulting in a shortage of resources waste

At present, in order to reduce the pollution and coking of high-sodium coal, people generally use blending to alleviate the problem, but due to the limitation of blending ratio, the fuel cost is greatly increased

However, most of the existing decoking agents on the market are developed for ordinary coal-fired coal, and it is difficult to deal with highly polluting high-alkali coal. The problem of large amount, or containing harmful components such as nickel, copper, chromium, etc., such as a chemical catalytic decoking agent disclosed in the Chinese patent document "Publication No. 102766498A", is not only used for supercritical, ultra-supercritical and other large units The special alloy of the alloy causes unpredictable corrosion, and also causes risks such as SCR catalyst poisoning

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