418 / 2018-12-26 09:47:11

Experimental Investigation for Co-Combustion characteristics of Semi-Coke and Bituminous Coal in a 3MWth Tangential Combustion Facility

tangential combustion, semi-coke, blending ratio; combustion characters; experimental investigation

全体主题 > 燃料利用与化学循环技术

1. State Key Laboratory of Efficient and Clean Coal-Fired Utility Boilers (Harbin Boiler Company Limited) Harbin 150046, Heilongjiang Province, China;2. School of Energy Science and Engineering, Harbin Institute of Technology, Harbin 150001, Heilongjiang Province, China.(Name: Jingyu Guan, Tel:18724608618/ 0451-82199578, Tax:0451-82198893, Email: guanjy@hbc.com.cn)An experimental investigation was conducted in a 3MW pilot-scale tangential combustion facility to explore the co-combustion characteristics of Chinese bituminous coal mixed with semi-coke after coal pyrolysis. The effects of blending ratio on combustion behaviors including average furnace temperature, ignition temperature, NO emission and combustion efficiency were discussed. As well as the thermal analysis during the whole combustion process was carried out by using thermal gravimetric analyzer (TGA). In this study, the excess air coefficient in main combustion sections and outlet were fixed at 0.85 and 1.2 respectively, while the blending ratio of semi-char was increased from 0 %to 50%. It is seen that with an increase of blending ratio of semi-coke, the average furnace temperature fluctuates in a small range while the temperature of combustion mode decreases obviously along the height of furnace. The ignition temperature was affected visibly by blending ration and was increased monotonically with the blending proportion of semi coke. As expected the ignition characteristics researched by TGA are similarly with the results of pilot-scale but have some differences, which may be due to the distinction of reaction atmosphere. The concentration of nitric oxide（NO）during combustion was sensitive to the blending ratio of semi-coke. With the increasing of blending ratio, the concentration of NO has an increased tendency. Furthermore, combustion efficiency was not sensitive to blending ratio and decreasing slightly with the increasing blend ratio. Key words: tangential combustion, semi-coke, blending ratio; combustion characters; experimental investigation