EXHAUST GAS TREATMENT SYSTEM INCLUDING CARBON DIOXIDE CHEMICAL ABSORPTION FACILITY AND METHOD

摘要

PROBLEM TO BE SOLVED: To provide an exhaust gas treatment system without causing divalent mercury (Hg2+) absorbed in limestone slurry liquid out of the mercury in an exhaust gas to be reduced in the form of metal mercury (HgO) and re-released to the exhaust gas due to the variation of operation conditions such as pH of absorption liquid.

SOLUTION: The exhaust gas treatment system includes: an air preheater 3 which heats combustion air for a fossil fuel combustion furnace; a dust-collection device 5 collecting soot and dust in the exhaust gas; a wet desulfurization device 7 that provides a wet treatment of sulfur oxides in the exhaust gas; and CO2chemical absorption facilities 11 that absorb and separate CO2from the exhaust gas. The exhaust gas treatment system includes: a heat exchanger 4 for exhaust gas heat recovery disposed between the air preheater and the dust-collection device; a heat exchanger 8 for reheating exhaust gas that increases the exhaust gas temperature by using the heat recovered by the heat exchanger for exhaust gas heat recovery, disposed between the wet desulfurization device and the CO2chemical absorption facilities; and a catalyst device 10 for oxidizing mercury in exhaust gas, disposed between the heat exchanger for reheating exhaust gas and the CO2chemical absorption facilities.

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