Patent ID: 6488740
Filing Date: 2002-12-03
Classification: B03C

Abstract:
An apparatus for decreasing the concentration of contaminants present in a flue gas stream emitted by a fossil-fuel fired boiler, comprising:a wet electrostatic precipitator (ESP) field disposed in a combusted fossil-fuel flue gas stream path downstream of a dry ESP field; at least one cooling nozzle disposed upstream of said wet ESP field in said combusted fossil-fuel flue gas stream path; a temperature sensor disposed in said combusted fossil-fuel flue gas stream path; and a flue gas temperature control valve disposed between a water source and said at least one cooling nozzle, wherein said temperature sensor and said flue gas temperature control valve are configured to control a flow of water through said cooling nozzle to control a temperature of a flue gas stream downstream of said at least one cooling nozzle.