scholarly journals Bench-scale methanation of pyrolysis gases of Tavantolgoi and Baganuur coals

Author(s):  
Nyamsuren B ◽  
Barsbold Kh ◽  
Buyan-Ulzii B ◽  
Baasanjargal T ◽  
Enkhsaruul B

Bench-scale methanation experiments were performed using the mixture gases evolved in pyrolysis of Tavantolgoi weathered coal and of Baganuur thermal coal. The methanation reactor was composed of the parts of feed gas desulfurization, fixed bed main reactor, condenser and dryer of product gases. The preliminary desulfurized feed gas passed through the fixed bed methanation reactor with the three layers of Ni/Al2O3 catalyst mixed with different amounts of quartz in order to avoid from overheating in upper level of the catalyst. Methanation experiments of pyrolysis gases were performed at temperatures of 250°С and 350˚°С, in a pressure of 3 bar with a GHSV of 9000 h-1. In methanation of pyrolysis gas from the Tavantolgoi weathered coal, CH4 content was increased 10 times from 3.20% to 34.4% at 250°С, however CH4 content was increased 3 times from 9.60% to 29.4% during the methanation of Baganuur coal pyrolysis gas at 350°С. Тавантолгойн болон Багануурын нүүрсний пиролизын хийн метанжуулалтын томруулсан туршилт Хураангуй: Энэхүү судалгааны ажлаар Тавантолгойн ордын исэлдсэн давхаргын нүүрс болон Багануурын ордын үндсэн давхаргын нүүрсний пиролизоос үүссэн хийг метанжуулах томруулсан (бэнч) хэмжээний туршилтыг хийж гүйцэтгэв. Метанжуулалтын томруулсан төхөөрөмж нь хүхэргүйжүүлэгч, конденсатор, чийг шингээгч болон хөдөлгөөнгүй үет реактор бүхий урвалын систем байхаар зохион бүтээсэн. Нүүрсний пиролизын хийг кварцтай хольж Ni/Al2O3 катализаторын гурван үеэр нэвтрүүлж, дулаан дамжуулалтын усгүй шийдлийг хэрэглэсэн. Метанжуулалтын томруулсан туршилтыг 250°С болон 350˚°С температуруудад, 3 бар даралтанд, 9000 h-1 түүхий эдийн урсгал хурдтай нөхцөлд хийж гүйцэтгэв. Тавантолгойн ордын исэлдсэн давхаргын нүүрсний пиролизын хийг метанжуулахад бүтээгдэхүүн хий дэх метаны агуулга 3.20%-иас 34.4% хүрч 10 дахин ихсэж, харин Багануурын нүүрсний хийнээс үүссэн метаны агуулга 9.60%-иас 29.4% болж 3 дахин ихэслээ. Хэдийгээр метанжуулах процессын температур харьцангуй нам байсан боловч Тавантолгойн ордын исэлдсэн давхаргын нүүрсний пиролизын хийн метанжуулалтын дүнд үүссэн метан хийн агуулга нь Багануурын ордын үндсэн давхаргын нүүрсний пиролизын хийтэй харьцуулахад 5.01%-иар их байлаа.

2014 ◽  
Vol 1008-1009 ◽  
pp. 247-251
Author(s):  
Wipawan Sangsanga ◽  
Chuan Na ◽  
Jin Xiao Dou ◽  
Jiang Long Yu

The catalytic effects of Zn on the release of the gaseous products during pyrolysis of Shenhua lignite was investigated by using a fixed-bed quartz reactor. The product gas compositions from the coal pyrolysis were analyzed by a gas chromatography (GC). Experimental results show that Zn had noticeable catalytic effects on lignite pyrolysis. With the increase in Zn content, lignite weight loss increases during pyrolysis. However, there was an optimum content for amount Zn into the coal. Pyrolysis temperature had a great impact on the composition of pyrolysis gas. As the pyrolysis temperature increased, char yield decreased and gas yield increased. There existed a temperature that tar yield reached its maximum value.


2017 ◽  
Vol 68 (7) ◽  
pp. 1496-1500
Author(s):  
Rami Doukeh ◽  
Mihaela Bombos ◽  
Ancuta Trifoi ◽  
Minodora Pasare ◽  
Ionut Banu ◽  
...  

Hydrodesulphurization of dimethyldisulphide was performed on Ni-Co-Mo /�-Al2O3 catalyst. The catalyst was characterized by determining the adsorption isotherms, the pore size distribution and the acid strength. Experiments were carried out on a laboratory echipament in continuous system using a fixed bed catalytic reactor at 50-100�C, pressure from 10 barr to 50 barr, the liquid hourly space velocity from 1h-1 to 4h-1 and the molar ratio H2 / dimethyldisulphide 60/1. A simplified kinetic model based on the Langmuir�Hinshelwood theory, for the dimethyldisulphide hydrodesulfurization process of dimethyldisulphide has been proposed. The results show the good accuracy of the model.


Author(s):  
Fahim Fayaz ◽  
Ahmad Ziad Sulaiman ◽  
Sharanjit Singh ◽  
Sweeta Akbari

The effect of CO2 partial pressure on ethanol dry reforming was evaluated over 5%Ce-10%Co/Al2O3 catalyst at = PCO2 = 20-50 kPa, PC2H5OH = 20 kPa, reaction temperature of 973 K under atmospheric pressure. The catalyst was prepared by using impregnation method and tested in a fixed-bed reactor. X-ray diffraction measurements studied the formation of Co3O4, spinel CoAl2O4 and CeO2, phases on surface of 5%Ce-10%Co/Al2O3 catalyst. CeO2, CoO and Co3O4 oxides were obtained during temperature–programmed calcination. Ce-promoted 10%Co/Al2O3 catalyst possessed high BET surface area of 137.35 m2 g-1. C2H5OH and CO2 conversions was improved with increasing CO2 partial pressure from 20-50 kPa whilst the optimal selectivity of H2 and CO was achieved at 50 kPa.


2019 ◽  
Vol 37 (3) ◽  
pp. 2959-2965 ◽  
Author(s):  
Chenghang Zheng ◽  
Xintao Liu ◽  
Xi Xu ◽  
Pei Yan ◽  
Qianyun Chang ◽  
...  

Minerals ◽  
2019 ◽  
Vol 9 (12) ◽  
pp. 772 ◽  
Author(s):  
Yvonne van Breugel ◽  
Ashton Keith Cowan ◽  
Harilaos Tsikos

Coal mining creates large volumes of waste in the form of discard coal that is stockpiled. In South Africa, rehabilitation of coal discard dumps remains a challenge due to reliance on topsoil for establishment of vegetation. Exploitation of fungal bio liquefaction/degradation of coal resulted in the emergence of Fungcoal as a bioprocess for the rehabilitation of coal discard dumps and opencast spoils. In this process, a suite of fungi is used to bio liquefy/degrade recalcitrant waste coal to form a soil-like material which promotes reinvigoration of the microbial component, grass growth, and re-vegetation. Here, the role of outcrop weathered coal as a mineral/carbon source to ensure biologically induced humic acid-like substance enrichment of discard and spoil to increase efficacy of fungi-plant mutualism and stimulate revegetation without the need for topsoil was investigated. Mineralogical, elemental, and pyrolysis gas chromatography-mass spectroscopic analyses show that outcrop weathered coal has decreased volatile material and increased humics, ash, and mineral bound water in comparison to bituminous coal. These changes occur coincidently with decreased C, N, and H contents, and a substantial increase in O concentration. No apparent stoichiometric relationship between sulphur and iron oxide content of weathered coal could be discerned suggesting little residual pyrite in this material and a dominance of oxy-hydroxides of Fe. Organic analysis showed weathered coal to be enriched in C-16 and C-18 fatty acids and the presence of the indicator, 17α(H),21β(H)-homohopane but not the β,β-stereoisomer, was interpreted to indicate that bacteria may only have been active prior to transformation of hard coal into weathered coal.


2020 ◽  
Vol 362 ◽  
pp. 1-10
Author(s):  
Quanlin Chen ◽  
Mengxiang Fang ◽  
Jianmeng Cen ◽  
Yifei Zhao ◽  
Qinhui Wang ◽  
...  

Energies ◽  
2012 ◽  
Vol 5 (4) ◽  
pp. 1062-1080 ◽  
Author(s):  
Ruengwit Sawangkeaw ◽  
Pornicha Tejvirat ◽  
Chawalit Ngamcharassrivichai ◽  
Somkiat Ngamprasertsith

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