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Tytuł pozycji:

Experimental study on ultra-low initial NOx emission characteristics of Shenmu coal and char in a high temperature CFB with post-combustion.

Tytuł :
Experimental study on ultra-low initial NOx emission characteristics of Shenmu coal and char in a high temperature CFB with post-combustion.
Autorzy :
Song, Guoliang
Yang, Xueting
Yang, Zhao
Xiao, Yuan
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Temat :
HIGH temperatures
COAL
COMBUSTION efficiency
ENERGY consumption
CHAR
EMISSION control
Źródło :
Journal of the Energy Institute (Elsevier Science); Feb2021, Vol. 94, p310-318, 9p
Czasopismo naukowe
The NO x emission of conventional circulating fluidized bed (CFB) boilers could hardly meet the increasing strict standards in China, so the initial NO x emission and control of Shenmu coal and char were investigated in a 0.5 MW th high temperature CFB test platform with a main combustion zone (MCZ) and a post-combustion zone (PCZ), the reducing atmosphere in MCZ suppressed the formation of NO x , high temperature in PCZ made the residual carbon and CO burnout, the technology of high temperature CFB with post-combustion had the advantage of decreasing the initial NO x emission while maintaining the combustion efficiency of fuel. The experimental results showed that as the injection position of post-combustion air (PCA) moving backward, the reducing zone in PCZ was enlarged so more NO x could be converted to N 2. When PCA was injected from PCA1 and PCA3, NO x and CO emission were both relatively lower than other injection positions, the temperature in PCZ of Shenmu char was more uniform and its NO x emission was lower compared to Shenmu coal, the peak temperatures of MCZ and PCC were 968 °C and 936 °C respectively, the initial NO x emission of Shenmu coal was 46 mg/m3 (at 6% O 2), meanwhile, the CO emission was 139 ppm. The initial NO x emission of Shenmu char could reach 41 mg/m3 when the temperatures of MCZ and PCZ were 931 °C and 913 °C respectively, the new ultra-low emission requirement (≤50 mg/m3) was successfully achieved without additional denitration equipment, so the technology of high temperature CFB with post-combustion is an effective ultra-low nitrogen combustion technology. • Reducing atmosphere could suppress the emission of NO x. • The NO x and CO emissions were both controlled at relatively low levels when PCA was injected from PCA1 and PCA3. • The initial NO x emission of char was lower due to its longer combustion duration. • High temperature CFB with post-combustion could make the initial NO x emission of coal and char achieve ultra-low. [ABSTRACT FROM AUTHOR]
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