| 摘要 |
<p>PURPOSE:To enable a mixed combustion of low calorific value gas of furnace gas and the like to be carried out in a circulation fluidized bed type boiler. CONSTITUTION:Gas of low calorific value is supplied to a bottom part of a combustion chamber, a part of combustion discharged gas is returned to a combustion chamber 8 by a discharged gas recirculating system 18. A flow rate control damper 21 in the discharged gas recirculating system 18 is controlled by a control device 22 in such a manner that when a mixed combustion rate of low calorific value gas is less in its value and a gas flow speed within the combustion chamber is lack, a returning amount of combustion discharged gas is increased and in turn, when a mixed combustion rate of the gas of low calorific value is much in its value, a returning amount of combustion discharged gas is decreased.</p> |
