Low rank coal – CO2 gasification: Experimental study, analysis of the kinetic parameters by Weibull distribution and compensation effect

2015 ◽  
Vol 74 ◽  
pp. 111-118 ◽  
Author(s):  
G. Skodras ◽  
G. Nenes ◽  
N. Zafeiriou
Keyword(s):  
Experimental Study ◽  
Weibull Distribution ◽  
Kinetic Parameters ◽  
Compensation Effect ◽  
Low Rank ◽  
Study Analysis ◽  
Low Rank Coal ◽  
Co2 Gasification

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.

Experimental study on co-combustion of low rank coal semicoke and oil sludge by TG-FTIR

2020 ◽  
Vol 116 ◽  
pp. 91-99
Author(s):  
Ruidong Zhao ◽  
Jianguang Qin ◽  
Tianju Chen ◽  
Leilei Wang ◽  
Jinhu Wu
Keyword(s):  
Experimental Study ◽  
Oil Sludge ◽  
Low Rank ◽  
Low Rank Coal

Experimental Study on Low-Temperature Carbonization of Low Rank Coal

2013 ◽  
Vol 805-806 ◽  
pp. 1311-1316
Author(s):  
Li Qun Wang ◽  
Zhong Xiang Wei ◽  
Zhong Bo Yi
Keyword(s):  
Experimental Study ◽  
Ash Content ◽  
Carbonization Temperature ◽  
Holding Time ◽  
Low Rank ◽  
Volatile Content ◽  
Low Rank Coal ◽  
Fixed Carbon ◽  
Dry Distillation ◽  
Increasing Trend

In this paper,a research was carried out on the regularities of carbonization temperature,holding time and mass on weightlessness of low rank coal. The experiment showed experiments in a certern range (450°C~700°C,<60min),weightlessness of coal in an increasing trend,the remained volatile content of semi-coke was measured reduce tending to value,ash content increased,fixed carbon gradually increased in the temperature range with the improvement of the carbonization temperature and holding time,also hydrogen and oxygen content of the char decreased,a significant increased in the carbon content,nitrogen and sulfur content was essentially the same. Reactivity of CO2 and semi-coke obtained in different carbonization conditions were better,the response rates are 100% when the temperature exceeded 1000°C. Best condition of dry distillation: carbonization temperature was 500°C~650°C,mass of low rank coal was less than 30g,holding time was between 30 minutes to 40 minutes.

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.

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