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Metal chloride influence on syngas component during coal pyrolysis in fixed-bed and entrained flow drop-tube furnace

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Science China(Technological Sciences) 2019年第11期62卷 2029-2037页

作者： sunel kumar HE Yong WANG ZhiHua LIU LongLong ZHU YanQun CEN Kefa State Key Laboratory of Clean Energy Utilization Zhejiang University

Pyrolysis was carried out in an entrained flow drop-tube furnace（DTF） and tube furnace（TF） using Pingzhuang lignite coal with various catalyst concentrations（2 wt%, 4 wt%, and 6 wt%） of KCl and CaCl2 for the syngas component at 800°C–1200°C. Five catalysts（KCl, CaCl2, NiCl2, MnCl2, and ZnCl2） at 6 wt% were chosen for DTF at 800°C–1200°C. An online gas chromatograph analyzer and the Fourier transform infrared spectra were used for the analysis of the syngas and char structure. Results showed that the overall CO2 and CH4 content in DTF was lower than that in TF, mainly due to the CH4 carbon reaction at high temperature. Moreover, the CO% in DTF was higher than in the TF experiment, as char reacts with carbon dioxide to form carbon monoxide. In DTF experiment, the maximum and minimum CO2 content was 15.20% with 6 wt% Mn at 800°C and 0.33% with 6 wt% K at 1100°C, respectively. The maximum CO% was found in raw coal. Concentrations of Mn2+, Zn2+, and K+can significantly increase H2%, whereas Ca2+ and Ni2+ have a minor effect on H2%; however, the overall presence of catalyst has a positive impact on the H2 content.

关键词： coal pyrolysis catalytic mechanisms Fourier transform infrared analysis syngas composition calorific value

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Influence of temperature and Ca(OH)2 on releasing tar and coal gas during lignite coal pyrolysis and char gasification

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Chinese Journal of Chemical Engineering 2019年第11期27卷 2788-2798页

作者： sunel kumar Zhihua Wang Zhang Kang Jun Xia Ronald Whiddon Yong He Jaffri Gul-e-Rana Zain Ali Saleh Bairq Kefa Cen State Key Laboratory of Clean Energy Utilization Zhejiang UniversityHangzhou 310027China Department of Mechanical Aerospace and Civil EngineeringBrunel University LondonUxbridge UB83PHUK Fuel Research Centre PCSIRKarachi 75280Pakistan College of Chemistry and Chemical Engineering Hunan UniversityChangsha 410082China

The yield of tar and syngas has been investigated by catalytic pyrolysis of Pingzhuang lignite(PZL)over Ca(OH)2 catalyst in temperature range of 600℃-1000℃in a tube *** results show that the yield of volatile pyrolysis increases and char decreases with rising temperature for both raw and catalyzed Pingzhuang *** hydrogen fraction(H2)increased from 20%to 40%for the PZL sample;but,for the PZL-Ca(OH)2 sample,H2 fraction fluctuated randomly between 35%to 42%,with the maximum H2 fraction found at 1000℃.The Gaschromatography mass-spectroscopic(GC-MS)analysis revealed that the maximum tar yield at 800℃and 700℃was obtained for PZL and PZL-Ca(OH)2,*** surface morphology of PZL and PZL-Ca(OH)2 chars underwent different transformation in the presence of catalyst as illustrated by SEM/EDX,FTIR,and BET ***,char sample was investigated for the carbon conversion and reactivity index using TGA analysis under N2 and CO atmosphere.

关键词： Catalyzed coal pyrolysis Release volatiles of tar and coal gas Surface area Pore volume

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The effects of gas flow pattern on the generation of ozone in surface dielectric barrier discharge

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Plasma Science and Technology 2019年第5期21卷 168-178页

作者： Songru XIE Yong HE Dingkun YUAN Zhihua WANG Yanqun ZHU Kefa CEN State Key Laboratory of Clean Energy Utilization Zhejiang University

Ozone production utilizing surface dielectric barrier discharge（SDBD） was experimental studied for different flow patterns considering the influences of transversal flow, lateral flow and different lateral flow positions. Results show that the flow patterns have a remarkable impact on the ozone yield by affecting the uniformity and turbulence of gas flow. Meanwhile, distributing the O2 flow rate according to the intensity of the plasma reaction would also increase the generation efficiency of SDBD for ozone production. By improving the uniformity and introducing the lateral flow to the transversal flow, the highest ozone yield was obtained in flow pattern ‘F’. In this case, the ozone yield increased by 28.4% to 131 g kWh-1 from 102.8 g k Wh-1 in flow pattern ‘A’.

关键词： surface dielectric barrier discharge gas flow ozone generation

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Influence of temperature and Ca(OH).2 on releasing tar and coal gas during lignite coal pyrolysis and char gasification

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中国化学工程学报（英文版） 2019年第11期

作者： sunel kumar Zhihua Wang Zhang Kang Jun Xia Ronald Whiddon Yong He Jaffri Gul-e-Rana Zain Ali Saleh Bairq Kefa Cen

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