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KMID : 1024519970060030267
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Journal of the Environmental Sciences
1997 Volume.6 No. 3 p.267 ~ p.276
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A Study on the Use of Low-Grade Domestic Anthracite by Anthracite - Bituminous Coal Blend Combustion in a Fluidized Bed Combustor
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Jung Jong-Hyeon
Cho Sang-Won
Son Byung-Hyun
Jeon Young-Hwa
Oh Kwang-Joong
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Abstract
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It has been studded that combustion and the production of air pollution of anthracite - bituminous coal blend In a fluidized bed coal combustor, The objects of thIns study were to investigate mixing characteristics of the particles as well as the combustibility of the low grade domestic anthracite coal and Imported h19h calorific bltununous coal in the fluidized bed coal combustor. They were used as coal samples ; the domestic low grade anthracite coal with heating value of 2,010kca1/kg and the Imported high grade bituminous coal with beating value of 6,520kca1/kg. Also, the effects of air flow rate and anthracite fraction on the reaching time of steady state condition have been studied. The experimental results are presented as follows. The time of reaching to steady state was affected by the temperature variation. The steady state time was about 120 minute at 300sc1h which was the fastest. It has been found that and concentration were reached steady state at about 100 minute. It has been found that concentration decreased and concentration increased as the height of fluidlzed bed Increased. It was found that splash zone was mainly located from 25cm to 35cm above distributor. Also, as anthracite traction Increased, the mass of elutrlatlon particles Increased, and concentration decreased. As gk flow rate Increased, concentration decreased and concentration increased. Regardless of anthracite fraction and flow rate, the uncombustible weight percentage according to average diameter of elutriation particles were approldmately high In the case of One Particles. As anthracite traction and k now rate Increased, elutriation ratio Increased. As anthracite fraction was increased, exit combustible content over feeding combustible content was Increased. Regardless of anthracite fraction, size distribution of Ued material from discharge was almost constant. Over bed temperature 85 and excess air 20% , the difference of combution efficiencies were little. It is estimate that the combustion condition In anthracite-bituminous coal blend combustion is suitable at the velocity 0.3m/s, bed temperature 85, the excess air 20%.
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KEYWORD
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Anthracite, bituminous, bed temperature, coal blend, exsess air, combustion efficiency, elutriation
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