No.32 1.5MWthパイロット試験設備における石炭燃焼排ガス中のホウ素,セレンの挙動評価(研究発表)

概要

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Boron (B) and selenium (Se) in effluent of wet flue gas desulfurization (WFGD) should be controlled to meet the regulation. Therefore to obtain fundamental data for optimization of coal-fired flue gas treatment system, behavior of B and Se was investigated throughout a pilot-scale test plant, which consisted of a furnace (1.5MWth), a selective catalytic reduction (SCR) reactor, a gas-gas heat-exchanger (GGH), a dry electrostatic precipitator (DESP) and a WFGD system. About 90% of B was captured by ash between the furnace and the SCR inlet (380℃), and the capture did not increase with decreasing gas temperature downstream of the SCR. On the other hand, Se was mostly in gaseous form at the SCR inlet, and Se capture by ash increased with decreasing temperature downstream of the SCR. Then Lowering gas temperature from 160 to 90℃ at GGH improved removal of Se across DESP and could reduce inflow of Se to WFGD.
2011-10-27