燃煤电厂锅炉中颗粒物在选择性催化还原、静电除尘器和烟气脱硫入口处的分布特性

发布时间：2019-05-17 07:40

【摘要】：采用承重撞击器颗粒物采样系统在国内某燃煤电厂4#锅炉进行颗粒物采集,采样点包括选择性催化还原(SCR)入口、静电除尘器(ESP)入口和烟气脱硫(FGD)入口。对采集的颗粒物的质量粒径分布特性和无机成分分布特性进行研究,结果表明相较于SCR入口,ESP入口处PM0.2~10的量减少24.45%,但主要减少超微米颗粒物;该锅炉ESP的效率很高,对PM0.2~1.0、PM0.2~2.5和PM0.2~10的脱除率分别达到99.52%、99.64%和99.79%;S在各采样点浓度差异明显,Al、Si的差异主要体现在亚微米颗粒物,Na、Ca浓度几乎不变;FGD入口,PM0.2~1.0中各无机元素的排放总量分别为:Na 0.03mg/m3、Ca 0.19mg/m3、Al 0.11mg/m3、Si 0.26 mg/m3和S 0.08mg/m3。
[Abstract]:The particle sampling system of load-bearing impactor was used to collect particles in No. 4 boiler of a coal-fired power plant in China. The sampling points included selective catalytic reduction (SCR) inlet, electrostatic precipitator (ESP) inlet and flue gas desulfurization (FGD) entrance. The mass particle size distribution characteristics and inorganic composition distribution characteristics of the collected particles were studied. the results showed that the amount of PM0.2~10 at the entrance of ESP decreased by 24.45%, but mainly decreased by ultra-micron particles compared with the entrance of SCR. The efficiency of ESP is very high, and the removal rates of PM0.2~1.0,PM0.2~2.5 and PM0.2~10 are 99.52%, 99.64% and 99.79%, respectively. The concentration of S is obviously different at each sampling point. The difference of Al,Si is mainly reflected in submicron particles, and the concentration of Na,Ca is almost unchanged. At the entrance of FGD, the total emissions of inorganic elements in PM0.2~1.0 were as follows: Na 0.03 mg / m3, Ca 0.19 mg / m3, Al 0.11 mg / m3, Si 0.26 mg/m3 and S 0.08mg / m3, respectively. the total emissions of inorganic elements in PM0.2~1.0 were 0.03mg / m3, 0.19mg / m3, 0.11mg / m3, 0.26mg / m3 and S 0.08mg / m3, respectively.
【作者单位】：广东电网公司电力科学研究院;煤燃烧国家重点实验室(华中科技大学);
【基金】：国家自然科学基金(51276072) 国家重点基础研究发展计划项目(2013CB228501) 煤炭联合基金重点项目(U1261204)~~
【分类号】：X773

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