Analysis of coal gasifier performance. Quantitative evaluation of development subjects and the analysis of factors influencing cold gas efficiency.:Quuantitative Evaluation of Development Subjects and the Analysis of Factors Influencing Cold Gas Efflcienc
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Perfomance data obtained from coal gasifiers, which have been so far or which are still being developed, were collected. The obtained data which were revised to meet the consistent material and heat balances were filed in the data base of coal gasiflers. Values of various key factors (heat loss, carbon utilization efficiency, unreacted steam etc.) which control the performance of the gasiflers, were calculated by use of the data base constructed above.<BR>Heat loss from gasifiers was increased with the increased feed rate of coal and the significant effect of scale up on the heat loss was not observed. The cold gas efficiency was increased with the increased operating temperature and pressure. The amount of required oxygen remained constant for each type of oxygen blown gas-solid contactors. However, the amount increased according to the order of fixed beds, fluidized beds and entrained beds. The chemical energy required for the production of oxygen accounted for approximately ten per centof the gross caloric value of coal.<BR>The cold gas efficiency of most fluidized bed gasifiers was increased by improved carbon utilization efficiency until the carbon utilization efficiency remained less than 93%. The cold gas efficiency of entrained bed gasiflers was further increased by the improved carbon efficiency which ranged up to 98%. Since the further increase of carbon utilization efficiency will increase the amount of gas produced, consequently the enthalpy loss of the produced gas, the cold gas efficiency is increased by reduction of heat loss. The reduction of the unreacted steam and the recovery of the enthalpy of the produced gas will result in increase in cold gas efficiency.
- 一般社団法人 日本エネルギー学会の論文
一般社団法人 日本エネルギー学会 | 論文
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