Patent ID: 9217565
Filing Date: 2015-12-22
Classification: F01K,F22B

Abstract:
1. A fuzzifier unit for use in a steam generating boiler system, comprising: a first input to receive a signal indicative of a magnitude of a difference between a saturated steam temperature and a temperature of intermediate steam generated by the steam generating boiler system that is a once-through boiler system providing a continuous flow of steam within the system to drive a turbine, wherein the temperature of the intermediate steam is determined upstream of a location at which a temperature of output steam is determined, the output steam generated by the steam generating boiler system for delivery to drive the turbine; a second input communicatively coupling the fuzzifier unit to a dynamic matrix controller that is feed forward or predictive, the second input of the fuzzifier unit to receive a control signal generated by the dynamic matrix controller, wherein the control signal (i) is generated, by the dynamic matrix controller, based on a signal, received as an input by the dynamic matrix controller, that is indicative of a current rate of change of a disturbance variable used in the steam generating boiler system, and (ii) is generated, by the dynamic matrix controller, not based on any input, to the dynamic matrix controller, that is indicative of the temperature of the intermediate steam; an adjustment routine that adjusts the control signal received at the second input of the fuzzifier unit based on the magnitude of the difference between the saturated steam temperature and the temperature of the intermediate steam; and an output communicatively coupling the fuzzifier unit to a field device, the output of the fuzzifier unit to provide the adjusted control signal to the field device to control the temperature of the intermediate steam.