Coal combustion-supporting hydrogel as well as preparation method and application thereof

Abstract

The invention discloses a coal combustion-supporting hydrogel as well as a preparation method and application thereof. The coal combustion-supporting hydrogel is prepared through the following steps of: (1) uniformly mixing 30-89% of metal nitrate, 5-60% of potassium chlorate, 1-3% of rare-earth elements, 5-30% of alkali metal hydroxide and 0-20% of sodium silicate, so as to obtain a mixture; (2) dissolving 3% of poly (N-isopropylacrylamide) and 30% of oxydol in water, and uniformly stirring, so as to obtain a solvent; and (3), dissolving the mixture in the solvent, so as to obtain the coal combustion-supporting hydrogel. The coal combustion-supporting hydrogel disclosed by the invention is non-corrosiveness, is stable in property, can be easily adsorbed to the surface of coal powder so as to form a loose porous combustion adjuvant layer, can be directly mixed with coal by virtue of a spraying device, and is convenient in use. By utilizing the coal combustion-supporting hydrogel disclosed by the invention, the desulfurization percent reaches 85%, the standard coal saving rate is 14.6%, the boiler thermal efficiency is improved by 10.6%, the carbon content of slags is reduced by 12.7%, and decoking, smoke abatement and corrosion inhibition reach more than 92%, so that the coal combustion-supporting hydrogel can achieve a combined action of saving coal and reducing the pollutant emission.

Description

technical field [0001] The invention relates to a coal combustion-supporting agent, in particular to a coal combustion-supporting hydrogel and its preparation method and application. The coal combustion-supporting hydrogel also has the effects of smoke elimination, dust removal and energy saving while supporting combustion, and is suitable for industrial boilers , Power station furnaces, kiln furnaces, steam furnaces and living briquette furnaces. Background technique [0002] my country is quite rich in coal resources, and the proven reserves rank among the top in the world, but they will be gradually depleted in 100 years. As far as the quality of coal is concerned, the quality of coal is uneven. Medium-high-sulfur coal and high-sulfur coal with a sulfur content of more than 2% in coal account for about 1 / 3 of the total reserves. Because of this factor, during the combustion process of coal, due to its poor quality, the combustion is not sufficient, resulting in low furna...

AI Technical Summary

Problems solved by technology

[0011] (2) Solid particle additives are not conducive to dispersion, and the effective contact area is too low;

[0012] (3) The sulfur-fixed product is simple calcium sulfate, which is not stable enough at high temperature and is easy to decompose again to release pollutants such as sulfur dioxide;

[0013] (4) A large amount of heavy metals and radioactive substances in industrial waste residues and tailings are likely to produce new pollution;

[0015] (6) Coke cleaning and corrosion inhibition effects are not ideal