Process and Apparatus for Improving the Operation of Wet Scrubbers

摘要

The description relates to improving the operation of wet scrubbers, especially those based on calcium carbonate, by reducing the quantities of soluble chlorides in the combustion gases fed to the scrubbers. By converting gaseous HCl in the combustion gases to a solid copper chloride and removing it before the chloride reaches the scrubber, the reactivity of the scrubbing slurry will be better maintained. Combustion gases are treated with an aqueous copper compound referred to as copper-bearing chloride remediator (CBCR). The process is preferably implemented by identifying locations within a combustor for feeding the CBCR, determining the physical form and injection parameters for the CBCR and injecting the CBCR under conditions effective to reduce HCl and/or sulfur oxides. Effective temperatures for introducing the CBCRs are preferably within the range of from about 250° to 900° F. Among the more preferred CBCRs are copper compositions including copper, an organic moiety and/or an ammonia moiety. One composition of this type is copper diamine diacetate, which has an empirical formula of C2H7CuNO2.

主权项

1. A process for reducing the chloride content in a gas stream for reducing the amount of chlorides fed to a wet scrubber, comprising:
a. introducing a copper bearing chloride remediator composition in aqueous form into contact with combustion gases within a defined introduction zone under conditions effective for HCl emissions control; b. passing the gases from the introduction zone to a particulate recovery device to provide a reduced chloride gas stream; and c. feeding the reduced chloride gas stream to a wet scrubber to enable the scrubber to operate more efficiently.