Importance

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Abstract

In an electronically controlled apparatus and method therefore for treatingot, dirty industrial exhaust gases utilizing dry environmental particulate separation, a plenum is constructed surrounding vertical hot gas exhaust duct, in which a concentric inlet connects the exhaust duct to the plenum, forming a bellow-discharge-gas-off-take. The plenum forms a settling chamber for coarse particles and housed within the settling chamber is a built in battery of high efficiency, high temperature cyclones, to separate the fine particles from the hot exhaust gases before the gases go through a gas-to-air-heat-exchanger, to transfer the sensible heat of the hot clean gases to the combustion air which in turn saves fuel. The apparatus has a servo-valve through which the cooled clean gases from the heat exchanger pass, and are taken in by a first suction fan. Bag filters contained in a baghouse, for further separation of the ultra fine particles is provided to obtain substantially particle-free cooled gases, which are discharged into the atmosphere. The suction from the fan is regulated by the servo-valve, which is controlled by an electronic controller. The controller is capable of maintaining a non-flow condition in the upward exhaust duct, and concurrently, full flow of the exhaust gases through the servo-valve and the suction fan by adjusting a calibration set point. This would subsequently prevent exhaust gases from escaping to the atmosphere and prevent air infiltration into the exhaust gases. In the alternative, the reverse can be obtained, if desired.

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First Claim