期刊
FUEL
卷 260, 期 -, 页码 -出版社
ELSEVIER SCI LTD
DOI: 10.1016/j.fuel.2019.116044
关键词
Exhaust tube vortex; Pulverized coal combustion; Air staged combustion; NOx reduction; Carbon burnout performance
资金
- Human Resources Development program of the Korea Institute of Energy Technology Evaluation and Planning (KETEP) grant - Korea government Ministry of Trade, Industry and Energy [20184030202060]
- Korea Institute of Energy Technology Evaluation and Planning (KETEP)
- Ministry of Trade, Industry & Energy (MOTIE) of the Republic of Korea [20163010140530]
- National Research Foundation of Korea (NRF) - Ministry of Science, ICT & Future Planning [NRF-2018R1A2B6003682]
Experimental investigations were conducted on the effect of the exhaust tube vortex (ETV) and the synergistic effect of the ETV and air staging on nitrogen oxide (NO) concentration and carbon monoxide (CO) concentration, as well as carbon burnout in a swirl-stabilized pulverized coal-fired furnace. To elucidate the aforementioned effects, four different swirl combinations were prepared derived from co-swirl and counter-swirl through five staging air injection positions. The results show that the ETV contributes to unburned carbon (UBC) combustion through its hollow-tube structure in the co-swirling flame. In addition, the temperature is distinguishable in the case of the 60 degrees-60 degrees co-swirl combination (S-co, (1)(.37/1.50)), and 60 degrees-60 degrees counter-swirl combination (S-ct, (1.37/1.50)) because of the shape of the inner recirculation zone (IRZ) and the occurrence of the ETV. Although the ETV effect follows the swirl intensity, the 50 degrees-50 degrees co-swirl combination (S-co,S- 0.95/1.03) is the most favorable for the ETV effect under the unstaged condition, considering the behavior of the burner aerodynamics that contains the IRZ and the flame propagation dependent on the swirl vane angle. The result without an ETV is reflected in S-ct(,) (1.3)(7/)(1.)(50), meaning incomplete combustion of the coal during the combustion procedure. In terms of the synergistic effect, NO and CO reduction rates, as well as carbon burnout are needed to evaluate the best overall performance. According to evaluation, S(co,)( 1.37/1.50 )at staging level 3 (SL3) has the highest synergistic effect because the effect of air staging is maximized in SL3 given the longest particle residence time in the re-burning zone.
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