Coal is a main energy resource and many households in our country use honeycomb briquettes made of coal for both heating and cooking. But because there is no necessity for heating in summer, a lot of coal is wasted when honeycomb briquettes are used as fuel for cooking.
What is important in making ignition honeycomb briquette as fuel for cooking is to reduce the consumption of ignition energy to the minimum, to shorten ignition time and to raise the combustion rate as high as LPG (Liquefied Petroleum Gas) so that cooking can be finished in a short time. Therefore, many researchers have conducted study on lowering an ignition temperature and raising a combustion rate by lowering combustion activation energy of coal with addition of combustion additive to coal or mixing of coal and biomass.
Kim Mun Hyok, a section head at the Faculty of Mining Engineering, has developed a double layer ignition honeycomb briquette with high combustion rate that can be ignited with only a sheet of paper. For this, he first calculated the minimum mass of a double layer honeycomb briquette for cooking a meal for a household (5 people) with coal and charcoal as main materials and sodium ferrate solution as a combustion additive. Then, he determined the mixing ratio and the crushing size of raw materials of the ignition layer, and the additive amount of combustion additives by the orthogonal experimental method.
The combustion rate of the double layer ignition honeycomb briquette is as high as 84.18% of LPG.
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