燃煤电厂烟气中的汞浓度测量

综述了燃煤电厂烟气中各种形态汞浓度的测量方法,并对各方法的优缺点进行比较.重点介绍美国环境保护署（EPA）推荐的安大略方法（Ontario Hydro Method,简称OHM）.该方法采用等速取样、加热和防止吸附的手段,具有真实样品的代表性和准确性;采用汞的冷蒸气原子吸收原理分析汞的浓度,因而精度较高;被美国EPA和能源部（DOE）等机构推荐为美国的汞标准测试和分析方法.同时指出在中国燃煤电站采用OHM法结合汞连续在线监SCEM（Semi-Continuous Emission Monitor）法进行烟气中汞浓度现场测试和分析的实际意义.

Measurement of Hg consent in flue gas of coal-fired power plant

The measurement approaches of mercury and its speciation concentrations for flue gas in coal-fired power plants were summarized along with comparisons among various mercury analytical methods.The Ontario Hydro Method(OHM) for mercury detection was focused which is recommended by US EPA and is known as the American standard method for mercury detection.It uses isokinetic sampling with a heated probe and glassware made sampling line,which effectively avoids the mercury vapor in flue gas from condensation and adsorption that occur easily in the site sampling circumstances.The specially designed OHM system makes its samples representative and accurate owing to using the principle of cold vapor atomic absorption in mercury analysis.The combination of OHM and SCEM(Semi-Continuous Emission Monitor) into field measurement of mercury concentration in flue gas of coal fired power plants in China was strongly suggested with practical significance.