Importance

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Abstract

Disclosed is an improved system for treating boiler flue gas to improve the removal of particulate matter contained therein by electrostatic precipitation. The improved system includes a source of liquid sulfuric acid, a source of water, a mixer for mixing the sulfuric acid and the water to form a dilute sulfuric acid, a first pipe for conveying the sulfuric acid from the acid source to the mixer, a first meter for controlling the amount of liquid sulfuric acid conveyed to the mixer through the first pipe, a second pipe for conveying the water from the water source to the mixer, a second meter for controlling the amount of water conveyed to the mixer through the second pipe, an injector for injecting the mixture of sulfuric acid and water from the mixer into the flue gas conduit before the particulate removing device in droplets small enough that the heat of the heated flue gas will cause the droplets to evaporate, and a third pipe for conveying the mixture of sulfuric acid and water from the mixer to the injector. The disclosed invention allows for the conditioning of flue gases by a system which is simple and inexpensive to install, maintain and operate, which requires no additional heat to vaporize the dilute sulfuric acid prior to injection, and which requires very little power, especially when compared to a conventional SO.sub.3 system.

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First Claim