STEAM TEMPERATURE CONTROLLING METHOD FOR REFUSE INCINERATING POWER PLANT

摘要

PROBLEM TO BE SOLVED: To extremely reduce total sprayed amount used for controlling steam temperature to improve plant thermal efficiency, by controlling a desuperheater of each unit so as to restrain temperature difference of steam generated form plural units which have a refuse incinerator and a waste heat boiler within tolerance. ;SOLUTION: In a plant which has plural units 500, 600... having a refuse incinerator 1 and a waste heat boiler 2 and drives a power generator 13 via a steam turbine 6 using generated steam, a steam temperature controller 2000 includes a boiler outlet steam temperature adjusting means 200 for restraining temperature difference of steam generated form plural units within tolerance. In addition, the controller 2000 includes a main steam temperature adjusting means 300 for controlling main steam temperature to a target value. On the basis of output signals from the adjusting means 200, 300, a sprayed amount controller 400 sets a target spayed amount, controls flow control valves 43-45 according to the set value, and adjusts sprayed amount corresponding to desuperheaters 37-39.;COPYRIGHT: (C)1998,JPO