DRUM TYPE BOILER WATER LEVEL CONTROL DEVICE AND METHOD OF CONTROLLING DRUM TYPE BOILER WATER LEVEL

摘要

PROBLEM TO BE SOLVED: To provide a drum type boiler water level control device capable of stably controlling a water level even in a case when an unexpected scenario such as lowering of a water supply temperature occurs in a drum-type boiler.;SOLUTION: A water level indicator 2 and a drum pressure indicator 3 are disposed on a drum 1 including a water supply pipe 22 and a main steam pipe 41, a water supply pump 24 is disposed on the water supply pipe 22, a flow meter 26 and a thermometer 25 are respectively set at the downstream side of the water supply pump, a pressure indicator 42 is disposed on the main steam pipe 41, and further a water supply energy calculating means 17a, a drum heating calculating means 17b, a main steam energy calculating means 17c, an in-drum input/output energy difference calculating means 17d, and pump control means 102, 104 are disposed as a control circuit.;COPYRIGHT: (C)2011,JPO&INPIT