Patent ID: 6530978
Filing Date: 2003-03-11
Classification: C10K

Abstract:
A method for removing particulate and aerosol contaminants from a gas stream originating from a negative or near atmospheric pressure gasifier consisting of the following steps:a. separating ash from a gas stream that originated from a negative or near atmospheric pressure gasifier by passing the gas stream through a high temperature separator to remove ash that was carried over from the gasifier, b. cooling the gas stream to approximately 600 degrees Fahrenheit or below by passing it through an indirect gas cooler, c. liquid scrubbing the gas stream to remove particulate matter from the gas stream, to remove some of the aerosol tars contained in the gas stream, to condense some water vapor, to agglomerate water and particulate matter, and to further cool the gas stream to approximately 100 to 150 degrees Fahrenheit by directly contacting the gas stream with countercurrent flow of liquid hydrocarbon, d. mechanically scrubbing the gas stream to cause the remaining aerosol tars and agglomerated water and particulate matter to coalesce on the inside surface and thereby be removed from the gas stream by using a high speed fan to forcefully direct the gas stream against an inside surface of one or more vortex chambers before the gas stream passes through an induced draft fan, e. cooling the gas stream to condense remaining aerosol tars and water by passing it through a heat exchanger, and f. removing condensed aerosols from the gas stream by passing the gas stream through a demister.