Method and system for controlling mercury emissions from coal-fired thermal processes

摘要

The present disclosure is directed to the use of elemental or speciated iodine and bromine to control total mercury emissions.

主权项

1. A method, comprising:
combusting, in a thermal unit, a halogen-containing and mercury-containing carbonaceous feed material to form a mercury-containing gas stream, the mercury-containing gas stream also comprising a halogen and particulates from the carbonaceous feed material; separating, in at least one of an electrostatic precipitator and baghouse, at least a portion of the mercury, halogen, and particulates from the mercury-containing gas stream; after separating, contacting, in a scrubber, a chemical agent with the mercury-containing gas stream to enhance removal of residual mercury from the mercury-containing gas stream, wherein the chemical agent comprises a halogen and wherein the halogen in the chemical agent comprises iodine; and after contacting, removing, by the scrubber, at least part of the halogen and the residual mercury from the mercury-containing gas stream.