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Title: Experimental and numerical studies of pressure effects on syngas combustor emissions
Author: Wang, Hanlin1, 2, 3; Lei, Fulin1, 2; Shao, Weiwei1, 2; Zhang, Zhedian1, 2; Liu, Yan1, 2; Xiao, Yunhan1, 2
Source: APPLIED THERMAL ENGINEERING
Issued Date: 2016-06-05
Volume: 102, Pages:318-328
Keyword: Syngas combustor ; Pollutant emissions ; Pressure effects ; NOx formation pathways
DOI: 10.1016/j.applthermaleng.2016.03.026
DOC Type: Article
English Abstract: Pressure effects on NOx and CO emissions of a model syngas combustor were experimentally and numerically studied. The validated numerical method was employed to analyze pressure effects on the combustor emissions such as different mixing levels and extra reactant addition. The model combustor, fueled with 10 MJ/N m(3) coal-derived syngas, was installed in a pressurized test-rig, and emissions were measured within 0.1-0.35 MPa. Based on the flow, temperature and species fields calculated by the CFD method, a chemical reactor network (CRN) model was established. With a detailed chemical scheme, the emissions calculated by the CRN model agreed well with experimental results. The model was then employed to calculate emissions within pressure range from 0.1 to 2.0 MPa, with the adiabatic flame temperature in the primary zone varied from 1477 to 2317 K. The calculated NOx and CO emissions generally showed exponential relationship with the operating pressure, except that the NOx emission decreased at higher pressure when the primary adiabatic flame temperature was lower than 1800 K. Through the analyses of the NOx formation pathways, it was found that the higher pressure would generally enhance the N2O pathway, which dominated NOx formation at low temperature, but NOx emission concentration through N2O pathway decreased with pressure above 1.0 MPa at low temperature, which could explain the NOx emission behavior. The CRN modeling method was applied to analyze the effects of pressure on emission behaviors under the different mixing modes and with the extra reactant such as H2O and NH3 in fuel. Premixed and steam dilution burning modes showed better performance on reducing emissions at elevated pressures. NH3 could obviously increase the emission levels, especially at low pressure. Comprehensive understanding of the relationship between the emissions and the operating pressure in full pressure range was obtained, which could be valuable for the predicting and analyzing the syngas combustor pollutant emissions. (C) 2016 ElSevier Ltd. All rights reserved.
WOS Headings: Science & Technology ; Physical Sciences ; Technology
WOS Subject: Thermodynamics ; Energy & Fuels ; Engineering, Mechanical ; Mechanics
WOS Subject Extended: Thermodynamics ; Energy & Fuels ; Engineering ; Mechanics
WOS Keyword Plus: CARBON MONOXIDE/HYDROGEN MIXTURES ; GAS-TURBINE COMBUSTOR ; HIGH-TEMPERATURE ; FLAME STRUCTURE ; NOX EMISSIONS ; NATURAL-GAS ; HYDROCARBONS ; DILUTION ; IGNITION ; REACTOR
Indexed Type: SCI
Funder: National Key Basic Research Program of China(2014CB247500) ; National Natural Science Foundation of China(91541123)
Language: 英语
WOS ID: WOS:000379270300035
Citation statistics:
Content Type: 期刊论文
URI: http://ir.etp.ac.cn/handle/311046/112493
Appears in Collections:中国科学院工程热物理所(论文库)_期刊论文(SCI)

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description.institution: 1.Chinese Acad Sci, Inst Engn Thermophys, Key Lab Adv Energy & Power, Beijing 100190, Peoples R China
2.Chinese Acad Sci, Res Ctr Clean Energy & Power, Lianyungang 222069, Jiangsu, Peoples R China
3.Univ Chinese Acad Sci, Beijing 100049, Peoples R China
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