CONTROL OF MERCURY EMISSIONS

摘要

Herein is provided a process wherein a mercury sorbent is subjected to an environment wherein thermal degradation and deactivation of the sorbent is expected but wherein the mercury capture is enhanced. In one embodiment, a process includes injecting a phyllosilicate mercury sorbent into the gas outlet between the furnace and the air heater; forming a mercury sorbed phyllosilicate by reacting the phyllosilicate mercury sorbent with mercury carried in the flue gas; and removing the mercury sorbed phyllosilicate from the flue gas with the particulate collection device. In another embodiment, an apparatus includes a particulate injection device adapted to provide a phyllosilicate mercury sorbent to flue gas carried in the gas outlet, the particulate injection device positioned to provide the phyllosilicate mercury sorbent at a location wherein the phyllosilicate mercury sorbent has a residence time in the flue gas of less than 1 second prior to entering the air heater.