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等速取样
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    The polycyclic aromatic hydrocarbons(PAHs)distribution character of the flue gas and fly ash emitted from electrostatic precipitator in two coal-firing boilers with the steam capacity 1000t/h and 2000t/h have been studied in a power plant of PR. Zhejiang based on isoknetic sampling method. PAHs concentrations and PAHs emission factors were determined.
    采用烟气等速取样方法在浙江某电厂2座蒸汽容量为1000t/h和2000t/h的燃煤电站锅炉进行电除尘器前后烟气和飞灰中多环芳烃分布的研究,给出了多环芳烃的浓度和排放因子,并对烟气净化装置对多环芳烃的脱除效率进行了观察。
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Ill this paper the design of an identical-velocity sampler to collect flyash and soot in flue gases is described.The sampler is compact in construction and self-aligning.The velocity in the sampling tube can be accurately maintained in identical with that in the main stream to make the sample representative.It employs the hot filtration process within the furnace to improve the accuracy of its measurement.Besides,it can be used to measure the velocity of the main stream while taking sample.Calibration in cold...

Ill this paper the design of an identical-velocity sampler to collect flyash and soot in flue gases is described.The sampler is compact in construction and self-aligning.The velocity in the sampling tube can be accurately maintained in identical with that in the main stream to make the sample representative.It employs the hot filtration process within the furnace to improve the accuracy of its measurement.Besides,it can be used to measure the velocity of the main stream while taking sample.Calibration in cold condilions and testing in hot working conditions proved that this sampler is convenient in use and accurate in measurement.

本文叙述了一种烟尘等速取样器的设计。该取样器能够找正气流方向,测速,进行等速取样;以等温过滤取样以保证量测精度。取样器结构紧凑。经过冷态标定及热态测试,证明该取样器测量准确,使用方便。

Based on the technological features of the desulfurization by wet limestone-gypsum method the authors have revealed through a study that Mg2+ concentration in slurry is equal to the concentration of Mg2+ in the droplet entrained by the flue gas at a demister outlet. On the basis of this conclusion a constant speed sampling was performed at the demister outlet with 5m3 of flue gas being extracted. On the basis of a determination of the Mg 2+ concentration in a micro-fiber filter wash liquid in the sampling system,...

Based on the technological features of the desulfurization by wet limestone-gypsum method the authors have revealed through a study that Mg2+ concentration in slurry is equal to the concentration of Mg2+ in the droplet entrained by the flue gas at a demister outlet. On the basis of this conclusion a constant speed sampling was performed at the demister outlet with 5m3 of flue gas being extracted. On the basis of a determination of the Mg 2+ concentration in a micro-fiber filter wash liquid in the sampling system, in a sampling-tube wash solution and in a blank micro-fiber filter wash liquid, as well as the slurry density in an absorption tower and the concentration of Mg 2+ in an absorption-slurry filtering liquid, calculated was the liquid droplet quantity entrained by the flue gas at the demister outlet.

根据湿式石灰石—石膏法脱硫的工艺特点,研究得出浆液中Mg2+浓度与除雾器出口烟气所携带的液滴中Mg2+浓度相等,据此结论,在除雾器出口进行等速取样,抽取烟气5m3,根据测定取样系统中微纤维过滤器洗液、采样管洗液及空白微纤维过滤器洗液中的Mg2+浓度、吸收塔浆液密度、吸收浆液滤液中Mg2+的浓度,来计算除雾器出口的烟气携带液滴量。

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...

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.

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。

 
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