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Dynamic analysis of a flameless combustion model combustor

Science China(Technological Sciences) 2010年第8期53卷 2291-2298页

作者： CUI YuFeng LüXuan XU Gang NIE ChaoQun Institute of Engineering Thermophysics Chinese Academy of SciencesBeijing 100190China Graduate School of the Chinese Academy of Sciences Beijing 100190China

flameless combustion is a new technology with the following advantages:1)Ultra-low emissions of both NOX and CO;2)fuel flexibility,from liquid fuels,natural gas to hydrogen-rich syngas;3)lower possibility of flashback and thermoacoustic *** this paper,we focus on the dynamic characteristics of a flameless model *** results show that flameless combustion can lower emissions while maintaining combustion ***,combining a pilot flame with flameless combustion may excite thermoacoustic instability.

关键词： flameless combustion thermoacoustic oscillations dynamic pressure characteristics gas turbine

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Development of high intensity low emission combustor for achieving flameless combustion ofliquid fuels

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Propulsion and Power Research 2013年第2期2卷 139-147页

作者： V.Mahendra Reddy Sudarshan Kumarn deparment of aerospace engineering indian nstitute of technologybombaypowai mumbai-400076india

This paper presents the experimental and numerical results for a two stagecombustor capable of achieving flameless combustion with liquid fuels for different thermalheat inputs of 20,30,40 and 60 kW and heat release density of 5-15 MW/m^(3).combustioncharacteristics and pollutant emissions are studied for three different fuels,kerosene,diesel *** influence of droplet diameter on pollutant emissions at all conditions is *** fuel and oxidizer are supplied at ambient *** concept of high swirl flows hasbeen adopted to achieve high intemal recirculation rates,residence time and increased dilutionof the fresh reactants in the primary combustion zone,resulting in flameless combustion *** is injected through four tangential injection ports located near the bottom of the combustorand liquid fuel is injected through a centrally mounted pressure swirl *** of the flow features shows that decrease in the exit port diameter of the primarychamber increases the recirculation rate of combustion products and helps in achieving theflameless combustion *** on preliminary computational studies,a 30 mm primarychamber exit pont diameter is chosen for experimental *** experimentalinvestigations show that flameless combustion mode was achieved with evenly distributedcombustion reaction zone and unifom temperature distribution in the *** emissions of CO, NO_(x),C_(x)H_(y) are measured and compared for all operating conditions ofdifferent fuels and different thermal inputs. The acoustic emission levels are reduced by6-8 dB as combustion mode shifts from conventional mode to flameless combustion mode.

关键词： Swirl flow combustion flameless combustion Internal recirculation Liquid fuels Spray combustion Low emissions

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Effects of the Secondary Air Excess Ratio on the Self-Preheating combustion Characteristics and NOx,Emission of Semi-Coke

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Journal of Thermal Science 2023年第3期32卷 1263-1277页

作者： DING Hongliang OUYANG Ziqu CAO Xiaoyang ZHU Shujun Institute of Engineering Thermophysics Chinese Academy of SciencesBeijing 100190China University of Chinese Academy of Sciences Beijing 100049China

The effects of the secondary air excess ratio(λ_(2))on the self-preheating combustion characteristics and NO_(x)emission of semi-coke have been experimentally studied on a bench-scale test *** combustion of the high-temperature preheated fuel(coal gas&coal char)has been achieved in all experimental *** fire-observation windows,the combustion zone was transparent and no flame fronts were ***,differentλ_(2)in this study were basically within the common range of self-preheating combustion *** results manifested that the rapid ignition of coal gas and the recirculation of high-temperature flue gas resulted in relatively high combustion temperatures close to the secondary air nozzle *** the increase of.12,the unburned carbon content of fly ash increased slightly and combustion efficiencies of all experiments exceeded98%.Moreover,the exit NO_(x)emission was not reduced linearly,which was dissimilar from conventional air staging *** main reason was that the volatile-N was released in the self-preheating device,and the air staging method could not effectively reduce the char-NO_(x).In the course of the experiments,the lowest NO_(x)emission was 64.35 mg/m3(@6%O2)whenλ_(2)was 0.40.

关键词： self-preheating pulverized coal NO emission flameless combustion

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Progress and recent trend in MILD combustion

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Science China(Technological Sciences) 2011年第2期54卷 255-269页

作者： LI PengFei MI JianChun DALLY B B WANG FeiFei WANG Lin LIU ZhaoHui CHEN Sheng ZHENG ChuGuang State Key Laboratory of Turbulence and Complex Systems Peking University Beijing 100871 China School of Mechanical Engineering University of Adelaide South Australia 5005 Australia State Key Laboratory of Coal combustion Huazhong University of Science and Technology Wuhan 430074 China

Moderate or intense low oxygen dilution(MILD)combustion plays a significant role in the mitigation of combustion-generated pollutants and greenhouse gases whilst meeting thermal efficiency ***,due to the lack of the fundamental knowledge on this combustion,there is a misconception that MILD combustion should be established by high preheating of the air,which has limited its *** research and development on this combustion has been performed for several years. We have found that the requirements for establishing the MILD combustion are more relaxed than *** is also revealed that this combustion of different type,i.e.,non-premixed,partially premixed and fully premixed,can be achieved by firing various fuels(i.e.,gaseous,liquid and solid fuels).It is suggested that the application of the MILD combustion can be expanded *** present review summarizes the progress and recent trend made in the R&D of this combustion and recommends further fundamental studies for improving our knowledge and widening its applications.

关键词： high temperature air combustion flameless oxidation flameless combustion oxy-fuel combustion

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