INFLUENCE OF ELECTRO-CATALYSIS ON EMISSIONS TO THE ENVIRONMENT DURING SOLID FUEL COMBUSTION
DOI:
https://doi.org/10.15421/jchemtech.v32i2.296301Keywords:
electrocatalysis; burning; nitrogen oxides; carbon monoxides;dielectric barrier dischargeAbstract
Nitrogen oxides, carbon oxides, and a large amount of various slags are among the largest emissions into the environment during the burning of solid fuel. Now there are three main sources of nitrogen oxide formation: "thermal", "fast" and "fuel". Each of the sources of formation of nitrogen oxides has its own formation mechanism. Carbon oxides (II) are formed during incomplete oxidation of fuel carbon along with aldehydes, organic acids and other hydrocarbons. One of the options for reducing atmospheric emissions and increasing the degree of solid fuel combustion is the use of electrocatalysis, the essence of which is to intensify the primary endothermic stages of the solid fuel combustion reaction, which are based on the use of directed action of an artificially created low-temperature plasma with an ordered movement of "slow" electrons. A dielectric barrier discharge was used as a source of "slow" electrons. With electro-catalytic combustion, a decrease in the concentration of nitrogen oxide (II) reaches almost 49 %, and carbon monoxide, at the same voltage, almost 33 %. Fuel burn rate increased by 30 %. The decrease in the formation of nitrogen oxides (II) can be explained by the fact that when using electrocatalysis, the formation of "thermal" and “fuel” nitrogen oxides is suppressed due to the fixation of atomic oxygen. Suppression of the formation of fast nitrogen oxides (II) occurs due to an increase in the thermal effect of the ongoing process.
Carbon (II) oxides are also oxidized to carbon (IV) oxide due to better diffusion of oxygen and the flow of "slow" electrons and an increase in the number of radicals HO•.
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