Predicting Mercury Retention in Utility Gas Cleaning Systems with SCR/ESP/FGD Combinations or Activated Carbon Injection
This paper presents validations of the Hg speciation predicted by NEAs MercuRator? Package with an American field test database for 28 full-scale utility gas cleaning systems.It emphasizes SCR/ESP/FGD combinations and activated carbon injection because these two applications present the best long-term,prospects for Hg control by coalburning utilities.Validations of the extents of Hg oxidation across SCRs and of Hg retention in wet FGDs gave correlation coefficients greater than 0.9 for both units.A transport-based FGD analysis correctly assessed the potential for Hg° re-emission in one limestone wet FGD.Among the 10 stations in the SCR/ESP/FGD validations,the simulations correctly identified 3 of 4 of the relatively high Hg emissions rates;all four of the sites with moderate emissions rates;and both sites with the lowest emission rates.The validations for ACI applications demonstrated that Hg removals can be accurately estimated for the full domain of coal quality,LOI,and ACI rates for both untreated and brominated carbon sorbents.The predictions for ACI depict the test-to-test variations in most cases,and accurately describe the impact of ACI configuration and sorbent type.ACI into FFs is the most effective configuration,although ACI into ESPs often removes 90％ or more Hg,provided that there is sufficient residence time and Cl in the flue gas.Brominated sorbents perform better than untreated carbons,unless SO3 condensation inhibits Hg adsorption.
Mercury Emissions Simulation Activated Carbon Injection Mercury Oxidation
Balaji Krishnakumar Chitralkumar V.Naik Stephen Niksa Naoki Fujiwar
Niksa Energy Associates LLC,Belmont,CA,94002 USA Coal and Environment Resarch Laboratory,Idemitsu Kosan Co.,Ltd,Chiba 299-0267 Japan
国际会议
The 7th International Symposium on Coal Combustion(第七届国际煤燃烧学术会议)
哈尔滨
英文
192-198
2011-07-19（万方平台首次上网日期，不代表论文的发表时间）