Study on the Process Analysis and Kinetics during the Co-Pyrolysis of Low Rank Coal and Enteromorpha

2014 ◽  
Vol 1008-1009 ◽  
pp. 268-273
Author(s):  
Chun Xia Wang ◽  
Xuan Ming He ◽  
Dong Zheng Feng ◽  
Fu Lu Ao
Keyword(s):  
Synergistic Effect ◽  
Reaction Rate ◽  
Compensation Effect ◽  
Process Analysis ◽  
Low Rank ◽  
Pyrolysis Process ◽  
Low Rank Coal ◽  
Kinetics Analysis ◽  
Exponential Factor ◽  
Maximum Value

The pyrolysis of low rank coal (LRC) , enteromorpha (EN) and their mixture were carried out in a special prolysis equipment. The experiments showed that the maximum tar yield of blends was 11.39% with a EN ration of 30%, which increased by 28.61% compared to LRC pyrolysis alone and 8.87% compared to calculated value. The thermogravimetric analysis (TGA) of LRC, EN and their mixture indicated that there was significant synergistic effect in the co-pyrolysis process of LRC and EN during 240~750°C. The relative maximum value of synergistic effect was 18.5%. Kinetics analysis showed there was compensation effect between activation energy and pre-exponential factor of co-pyrolysis. The mix of LRC and EN enhanced the reaction activity and lowers the reaction rate. Synergistic effect mainly was reflected in enhancing the reaction activity of co-pyrolysis.

Synergistic Effect of Surfactants and a Collector on the Flotation of a Low-Rank Coal

2014 ◽  
Vol 35 (1) ◽  
pp. 14-24 ◽  
Author(s):  
Jinzhou Qu ◽  
Xiuxiang Tao ◽  
Huan He ◽  
Xing Zhang ◽  
Ning Xu ◽  
...  
Keyword(s):  
Synergistic Effect ◽  
Low Rank ◽  
Low Rank Coal

The Gasification of Sewage Sludge in Bubbling Fluidized Beds

2003 ◽  
Author(s):  
A. T. Harris ◽  
S. A. Scott ◽  
J. S. Dennis ◽  
A. N. Hayhurst ◽  
J. F. Davidson
Keyword(s):  
Sewage Sludge ◽  
Fluidized Bed ◽  
Low Rank ◽  
Municipal Sewage ◽  
Low Rank Coal ◽  
Exponential Factor ◽  
Bubbling Fluidized Bed ◽  
Fluidized Bed Gasifier ◽  
The Uk ◽  
Kinetics Of

This paper gives the first measurements from a project investigating the gasification of dried sewage sludge in a laboratory scale, bubbling fluidized bed at atmospheric pressure. The aim of the work was to examine the reactions occurring in a fluidized bed gasifier rather than simply treat the reactor as a ‘black box’. Experiments were performed to investigate the rates of drying, devolatilisation, gasification and combustion. Thermogravimetric analysis, as well as batch fluidized bed experiments using mechanically dewatered, dried and pelletised municipal sewage sludges from different regions in the UK were performed. A comparison was made between the different samples of sludge and a low rank coal and softwood biomass. A distributed activation energy model (DAEM) for interpreting the kinetics of devolatilisation was also investigated. The model was able to reduce the results from several TGA experiments to a single curve characterised by a single parameter, the pre-exponential factor, A.

Experimental Study on Pyrolysis and Combustion Characteristics of PVC and PP

2013 ◽  
Vol 781-784 ◽  
pp. 2017-2021 ◽  
Author(s):  
Lin Chen ◽  
Shu Zhong Wang ◽  
Hai Yu Meng ◽  
Jun Zhao ◽  
Zhi Qiang Wu
Keyword(s):  
Compensation Effect ◽  
Combustion Characteristics ◽  
The Other ◽  
Kinetics Analysis ◽  
Fixed Carbon ◽  
Two Phase ◽  
Exponential Factor ◽  
Volatile Release ◽  
Carbon Combustion ◽  
Two Phases

This paper describes the pyrolysis and combustion characteristics of PVC and PP from municipal solid waste applying the non-isothermal thermogravimetric analysis, the apparent activation energy and the pre-exponential factor were obtained by kinetics analysis. There is one phase in the pyrolysis of PP, which is volatile release at 281-489 °C. While, the process of PP combustion consists of one phase which is volatile release and combustion. There are two phases that are different volatile release in the pyrolysis of PVC. In the process of PVC combustion, there are two phase, the first is part of volatile release and combustion, the second is the other volatile release and fixed carbon combustion. It has been found that compensation effect exists in PP and PVC pyrolysis and combustion with the variation of oxygen concentration.

scholarly journals The assessment of synergistic effect on performing the co-pyrolysis process of coal and waste blends based on thermal analysis

2021 ◽  
pp. 310-310
Author(s):  
Zagorka Brat ◽  
Bojan Jankovic ◽  
Dragoslava Stojiljkovic ◽  
Milos Radojevic ◽  
Nebojsa Manic
Keyword(s):  
Thermal Analysis ◽  
Synergistic Effect ◽  
Heating Rate ◽  
Decisive Role ◽  
Low Rank ◽  
Strong Interactions ◽  
Coal Waste ◽  
Pyrolysis Process ◽  
Heating Rates ◽  
Spent Coffee Ground

The preliminary thermogravimetric studies of co-pyrolyzed low-rank coals (lignites Kostolac (KSL) and Kolubara (KLB)) with waste materials (spent coffee ground (SCG) and tire rubber granulate (WRG)) in a form of blends have been performed. Thermal analysis (TA) measurements of blend samples were carried out in a nitrogen (N2) atmosphere at three different heating rates of 10, 15 and 20 K min-1. The coal-waste blends were prepared in the percentage ratios of 90:10, 80:20 and 70:30. This work analyzed the synergy analysis for considered blends shown via descriptive parameters during co-pyrolysis process. According to the performed analysis, the presence of synergistic effect was identified, where strong interactions were also observed. For lignite-SCG blends, it was found that two factors which affect the synergy effect with coal are concentration of added biomass material and the heating rate. For lignite-WRG blends, the blending ratio take on a decisive role for positive consequences of a synergistic effect (ratios below 30 % of WRG in coals are desirable). Also, in this work the influence of micro-scale condition parameters such as heating rate (as the experimental regulatory factor) was analyzed on the magnitude response of synergism during co-pyrolysis.

scholarly journals Catalysis and compensation effect of K2CO3 in low-rank coal — CO2 gasification

2013 ◽  
Vol 11 (7) ◽  
pp. 1187-1200 ◽  
Author(s):  
George Skodras
Keyword(s):  
Compensation Effect ◽  
Low Rank ◽  
Isokinetic Temperature ◽  
Boudouard Reaction ◽  
Low Rank Coal ◽  
Catalytic Gasification ◽  
Co2 Gasification ◽  
Gasification Rate ◽  
Active Intermediates ◽  
Catalyst Load

AbstractThe CO2 gasification of a low rank coal catalysed by K2CO3 was studied, at 700–950°C and 1 atm. A two level full factorial design revealed that the gasification reaction was sensitive to the solid residence time, reaction temperature, CO2 partial pressure and catalyst load. K2CO3 was an efficient catalyst at all temperatures studied, particularly during the second stage when the Boudouard reaction dominates. The gasification rate was increased continuously with increasing catalyst load up to a load of ∼20% w/w K2CO3 concentration, following a sigmoid curve. Above this point, limited catalytic effect was observed, possibly due to the saturation of the lignite surface by K+. A correlation was found to exist between the catalytic gasification rate and the Alkali Index, which increased with the impregnation of the inorganic K2CO3 salt. When K2CO3 load increased, the Arrhenius parameters, E and k 0, increased simultaneously exhibiting a compensation effect. The isokinetic temperature was found about 600 to 650°C corresponding to the minimum temperature required for the formation of catalytic active intermediates. At temperatures studied, the catalytic active intermediates seemed to be always present and the catalysis progresses unhindered due to the redox cycle, resulting in high rates and conversion.

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