APPARATUS FOR CONTROLLING THE DELIVERY OF AIR TO A COAL PULVERIZER

摘要

The flow of preheated and ambient air to a processor, such as a coal pulverizer, are controlled in a manner whereby the preheated air flow will be varied as a function of pulverizer discharge temperature air while "cold" ambient air flow will be varied as a function of pulverizer inlet air mass flow rate. Flow error signals are caused to vary as a function of temperature error to enhance system response to temperature errors, and flow error will be caused to take precedence over temperature error should pulverizer inlet flow fall below a predetermined minimum.