id	keyword
ap-3908	control
ap-3908	controller
ap-3908	system
ap-3908	coal
ap-3908	gasification
ap-3908	ucg
ap-3908	parameters
ap-3908	process
ap-3908	stabilization
ap-3908	value
ap-3908	temperature
ap-3908	control system
ap-3908	figure
ap-3908	air
ap-3908	flow
ap-3908	pressure
ap-3908	syngas
ap-3908	concentration
ap-3908	model
ap-3908	variable
ap-3908	underground
ap-3908	gas control