Behavior and estimation of nitrogen oxides emission in 71MWe PFBC boiler

Yasujiro Tsuji, Khoichi Tazawa, Rikiya Abe, Hiroshi Sasatsu, Tatsuro Harada

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6 Citations (Scopus)


71 MWe PFBC demonstration plant was successfully operated in the period of 1992 to 1997 in EPDC Wakamatsu Work to complete all the tests of phase I. During the operation, emissions of NOx and N2O ware continuously measured under different load condition and different type of coal and their mixture. Such operational conditions influenced operational parameters such as temperatures of combustion and exhaust gas, pressure in the boiler and oxygen content in the exhaust gas, etc. The effect of such operational parameters on emissions of NOx and N2O was analyzed. Since the nitrogen in the fuel was found to be the sole source of NOx and N2O, the emissions of NOx and N2O were normalized by fuel-N to calculate conversion. The effect of operational parameters on conversion of NOx, that to N2O and overall conversion of N into nitrogen oxides (NOx+2N2O) were analyzed. This overall conversion as well as the conversion into N2O was well correlated to the temperature of cyclone gas (TC) and square root of PO2 in the exhaust gas. The conversion into NOx was calculated as the difference of overall and N2O conversions. The concentrations of NOx and N2O are thus estimated by use of functions of TC and PO2 named ASHTR. Parameters in the functions were experimentally defined using a coal to establish ASHTR equations. The equations were confirmed to be applied for other coals and their blends and to estimate the rapid change of NOx concentration due to the rapid change of PO2 and TC.

Original languageEnglish
Pages (from-to)191-200
Number of pages10
JournalNihon Enerugi Gakkaishi/Journal of the Japan Institute of Energy
Issue number3
Publication statusPublished - 1999
Externally publishedYes

All Science Journal Classification (ASJC) codes

  • Renewable Energy, Sustainability and the Environment
  • Fuel Technology
  • Energy Engineering and Power Technology


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