Patent ID: 9631810
Date: 2017-04-25
CPC Classifications: B01D,F23G,F23J,Y02E

Claim:
1. A method of treating an exhaust gas stream from a processing chamber, the method comprising the steps of: conveying the exhaust gas from the processing chamber using a vacuum pumping arrangement or atmospheric line; abating the exhaust gas in an abatement region of an abatement device; injecting a cooling agent downstream of the abatement region to cool the abated gases in a cooling region by phase change of the cooling agent and form a cooled gas mixture including the cooled abated gases and the cooling agent; dry filtering particulates from the cooled gas mixture using a dry filtration apparatus downstream of the cooling region; sensing at least one of the flow rate and temperature of the abated gases of the abated exhaust gas with a sensor; adjusting an amount of the cooling agent injected downstream of the abatement region according to the at least one of the sensed flow rate and temperature of the abated gases to change a phase of substantially all of the cooling agent in the cooling region and result in the cooled gas mixture having a relative humidity of less than 100% to be non-condensing after injecting the cooling agent and through the dry filtration apparatus.