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Zhou T.,Institute of Engineering Thermalphysics | Gong Z.,Institute of Engineering Thermalphysics | Gong Z.,University of Chinese Academy of Sciences | Lu Q.,Institute of Engineering Thermalphysics | And 2 more authors.
Energy and Fuels | Year: 2015

This paper explores possible measures of enhanced control of the nitrogen oxides (NOx) emission from combustion on a new circulating fluidized bed (CFB) test platform, which is a combined CFB and post-combustion chamber (PCC). Characteristics of Shenmu char combustion and NOx emission were studied on the conditions of the secondary air (SA) arrangement, lean oxygen combustion, and post-combustion, respectively. In comparison to the conventional methods (SA arrangement), post-combustion is a new method to improve control of the NOx emission during the combustion process. Experimental results show that the approach of modifying the SA arrangement is able to remove the NOx emissions by up to 30%, the lean oxygen combustion can reduce NOx emissions significantly but resulting in a declined combustion efficiency, and post-combustion is able to bring the final concentration of NOx emission down to only 51 mg/m3 (at 6% O2), meanwhile maintaining the high combustion efficiency of 98.6%. © 2015 American Chemical Society.


Gong Z.,Institute of Engineering Thermalphysics | Gong Z.,University of Chinese Academy of Sciences | Liu Z.,Institute of Engineering Thermalphysics | Zhou T.,Institute of Engineering Thermalphysics | And 2 more authors.
Energy and Fuels | Year: 2015

The combustion and NO emission characteristics of Shenmu coal and char were investigated with a thermogravimetry-mass spectrometry (TG-MS) system and on a pilot platform of a 2 MW circulating fluidized bed (CFB), respectively. Unlike Shenmu coal, the disadvantages of Shenmu char combustion include late ignition, poor combustion stability, and poor burnout. Despite its well-developed pore structure, there is less volatile content and more carbon crystal for Shenmu char, resulting in lower combustion reactivity compared to Shenmu coal. The combustion of Shenmu char has a higher dependence upon the combustion temperature, and it improves when the combustion temperature exceeds 900 °C. NO emission from the combustion of Shenmu char decreases with an increase in the combustion temperature, which is in contrast with the combustion of Shenmu coal. However, with an increase in the excess air ratio and a decrease in the secondary air ratio and the height of the secondary air port, NO emission from the combustion of both Shenmu char and coal increases. © 2015 American Chemical Society.

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