An automatic closed-loop control system of boiler load for combined joint and separate combustion of gases

Abstract

A system for automatic closed-loop control of drum boiler heat load for combined joint and separate combustion of blast-furnace, coke, and natural gases under the conditions of randomly changed flow rates of blast-furnace and coke gases is considered. For achieving more efficient operation of the automatic control system, it is proposed to introduce circuits for compensating random disturbances in the flow rates of these gases in addition to the standard automatic control system using the heat signal. The estimated parameters of the control channels transfer functions are presented for different ratios between the flow rates of fired gases and boiler loads. The results obtained from an investigation of the combined system are described, and its effectiveness with the boiler operating in different modes is demonstrated.