Method of water supply regulation for waste heat steam generator

摘要

The method involves three-point regulation with a governing level regulator (13) and subordinate throughflow regulator (14) for the water supply, whereby the demand value (Sollein) for the throughflow regulator is shifted wrt. the level regulator so that the level in the drum (6) is always controlled to the demand value independently of noise effects. The throughflow regulator for the water supply is controlled according to the heat quantity in the output gas flow from a gas turbine. The flow regulator output signal is limited, being selected as a function of the heat quantity in the output gas flow between a start-up phase limit value and a normal operation limit value.