Method and apparatus for controlling temperature in combustion furnace in gasification equipment
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United States of America Patent
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Jan 27, 2015
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N/A
app pub date -
Oct 22, 2010
filing date -
Oct 28, 2009
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Abstract
A char 7 feed rate at a rated point determined from a relationship between a current water vapor 3 flow rate and a current raw material 5 charge rate to a gasification furnace 1 is multiplied by a proper number determined from a relationship between a current gasification furnace 1 temperature and a current bed material 4 circulated rate to calculate an actual char 7 feed rate. A subtraction is performed between a gross heat value of the char 7 flowing into the combustion furnace 2 determined on the basis of the calculated char 7 feed rate and a heat value required for keeping a top of the combustion furnace 2 at a commanded temperature determined from a relationship between the commanded temperature and an air flow rate in the furnace 2 to determine a heat value required for keeping the combustion furnace 2 at the commanded temperature. An auxiliary fuel operation rate is determined from the determined heat value to perform an advanced control for an auxiliary fuel feeder 21 and is regulated such that a difference as a result of subtraction between the commanded and detected temperatures in the top of the furnace 2 becomes zero to perform a feedback control for the feeder 21.
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