Abstract
In order to develop a mechanism of clean and efficient combustion, this study studied the combustion mechanism of stover semi-gasification by a clean stove designed. The experimental material was corn Stover briquettes. Process of semi-gasification combustion can be divided into two parts: gasification stage and combustion stage. First, under the low primary air amount, stover gives off partly combustible gas (Volatile matter). Then, the combustible gas rises and burns in the upper Furnace when it meets higher secondary air amount. At the same time, the residue remained in bottom Furnace keeps on gasifying and burning under high temperature until the fuel is exhausted. In the process, two phases (solid and gas) combustion becomes into one phase (gas) combustion. Due to inadequate primary air and low temperature of semi-gasification chamber (550-750℃), all the ash was loose and no slag was found. Moreover, combustible gas produced was directly completely burned off and no tar appeared in the emissions. According to the result, the combustion thermal efficiency of clean stove (75%) is up to 75% and higher than primary stove (below 12%).
Highlights
Stover is a kind of agricultural residue available in the world, which includes husks, leaves and stalks and so on
Only a little part was utilized by the obsolete stoves, it has been used as fuel for generation in the power plant by direct combustion or gasification combustion
The result is that two phases combustion becomes into one phase combustion, which reduces the emissions of particulates and CO and improves the indoor air quality
Summary
Stover is a kind of agricultural residue available in the world, which includes husks, leaves and stalks and so on. Stover has served as one of the primary energy forms utilized by humans for essential activities aside from nutritional from ancient times to the present. I.e., the carbon emitted during their combustion is taken up in the re-growth of the biomass used to produce them, and has been used as an alternative energy biomass used to produce them. Stover has been used as an alternative energy source to abate the current energy and the greenhouse gas problems (Christiansen, 2009; Foley, 1978; Morey and Thimsen, 1980). The amount of stover is tremendous, about 2.9 billion tons estimated globally every year. In China, stover is abundant, about 0.7 billion tons every year. Direct combustion or gasification related problems have more than occasionally been observed in Stover burners since it Recognizing these, this study initiated to study the combustion mechanism of stover semi-gasification
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