As a novel technology, coal preheating
technology has been proved
to be effective on NO
x
reduction by previous
experiments. However, the role of some components of the fuel is still
not clear in the preheating process and combustion process. To clarify
the effects of volatile and carbon on NO
x
formation and reduction, three fuels with different volatile contents
were used, and the experiments were launched in a bench-scale coal
preheating combustion test apparatus. Results showed that the self-preheating
burner was widely adaptable to the fuels and the fuels could be stably
preheated to be above 860 °C. The coal gas mainly containing
the combustible components of CO, H2, and CH4 was generated in the self-preheating burner, accompanying with the
high-temperature coal char. Due to the high contents of carbon and
volatiles, more combustible components in coal gas could be yielded
by the bituminous coal after being preheated. Most of the volatile
matters and carbon were released into the coal gas, and the volatile-N
was mainly converted into N2. Because of the reduction
of CO and carbon in char, the NO
x
conversion
rates were low enough of the bituminous coal and the semicoke, while
the NO
x
conversion rate of the coal gasification
fly ash was a little high for its low carbon content.
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