Journal
FUEL
Volume 294, Issue -, Pages -Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.fuel.2021.120549
Keywords
Ultra-low NOx; CFB; Bituminous coal; Gasification combustion; Preheating combustion
Categories
Funding
- Transformational Technologies for Clean Energy and Demonstration, Strategic Priority Research Program of the Chinese Academy of Sciences [XDA21040100]
- National Natural Science Foundation of China [51876204]
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This study utilized advanced combustion techniques to achieve original ultra-low NOx emissions and high combustion efficiency.
Higher effective combustion with fundamental pollution ultra-low NOx emissions for pulverized coal is multi-disciplinarily sought in recent decades. In this work, a novel megawatt-class pilot-scaled experimental investigation of Shenmu bituminous coal preheated semi-gasification combustion (PSGC), non-dimensional momentum parameters and modified binary fuels combustion organization was implemented to obtain both original ultra-low NOx emissions and high combustion efficiency. Depended on the fluidization preheated physicochemical modification for raw pulverized coal and deep reducing NOx emission methods, the modified Shenmu bituminous coal was constructed to combust with preheating ultra-low NOx methodology to obtain the deep-controlled original ultra-low NOx emission with high burnout ratio. The results showed that the thermal input was 1.64 MWth and the minimum average original NOx emission was 49.6 mg/m(3) at 6%O-2. Meanwhile, the combustion efficiency was 99.4% with the momentum ratio between inner and outer secondary air (MRsa) was 0.26. The upped air-to-fuel stoichiometric ratio (Phi(A/F)(pa)) 0.22 as fluidized preheating air ratio improved the conversion ratio (CRf) of raw fuel components and further promoted the reduction conversion ratio for both hot char-N and volatiles-N in this special phyciochemical conversing process in the fluidized preheating partial gasification combustor.
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