Study on Brown Coal Pyrolysis

2012 ◽  
Vol 524-527 ◽  
pp. 894-897
Author(s):  
Gang Wei Zhao ◽  
Yun Han Xiao
Keyword(s):  
Brown Coal ◽  
Coal Tar ◽  
Fixed Bed ◽  
New Method ◽  
Fixed Bed Reactor ◽  
Coal Pyrolysis ◽  
Reaction Condition ◽  
Combustion Processes

It is very important to the combustion processes of coal pyrolysis, so the effects of all reaction condition on the brown coal (Yunnan,China) were investigated by using the fixed bed reactor in detail. Through the new method of part-hydrogenation of the pyrolysis, it can be increased the content of coal tar at the same time reduced H2consumption.

The Effects of Methanol on Honehe Lignite Pyrolysis

2013 ◽  
Vol 291-294 ◽  
pp. 748-754
Author(s):  
De Min He ◽  
Jun Guan ◽  
Lin Zhang ◽  
Qiu Min Zhang
Keyword(s):  
Flow Rate ◽  
Functional Group ◽  
Coal Tar ◽  
Fixed Bed ◽  
Holding Time ◽  
Fixed Bed Reactor ◽  
Coal Pyrolysis ◽  
Oxygen Functional Group ◽  
N2 Atmosphere ◽  
N2 Flow Rate

In this paper, the pyrolysis of Honehe Lignite in N2 and N2-Methanol atmospheres were investigated on a fixed-bed reactor. The methanol flow rate, pressure, temperature and holding time were studied. The maximum of coal tar yields 12.01% (with methanol injected in) and 9.61% (absence of methanol) were achieved on the conditions of 520°C, 0.5MPa, N2 flow rate 50ml/min, methanol flow rate 0.1ml/min and holding time 20min, and the relative growing rate was about 25.0%. The gas from coal pyrolysis was detected by GC, and the coal tar was reprocessed and then detected by GC-MS. While the solid char was detected by IR to study the change of oxygen functional group during coal pyrolysis in N2-Methanol atmosphere. Compared with that pyrolysis in N2 atmosphere, the components, characteristics and properties of coal tar, gas and solid char varied a lot. The results showed that the injection of methanol into the system changed the products yields and distribution. The results showed that the total yields of phenol, cresol and xylenol (short for PCX) in the Acidic were about 1.93% and 1.15% (daf) in two atmospheres respectively, the PCX yields with methanol injected was about 1.67 times higher than that absence of methanol.

Effect of Minerals in Coal on the Product Yield of Coal Pyrolysis and Phenols in the Low-Temperature Tar

2012 ◽  
Vol 512-515 ◽  
pp. 1129-1136 ◽  
Author(s):  
Fan Hu Zeng ◽  
De Min He ◽  
Jun Guan ◽  
Qiu Min Zhang
Keyword(s):  
Carbon Monoxide ◽  
Low Temperature ◽  
Brown Coal ◽  
Atmospheric Pressure ◽  
Fixed Bed ◽  
Product Yield ◽  
Fixed Bed Reactor ◽  
Coal Pyrolysis ◽  
Catalytic Role

Wulagai brown coal and Wulagai acid washed brown coal were used to investigate the effect of minerals in coal on the reactivity of coal pyrolysis. The experiments were carried out at atmospheric pressure in a fixed bed reactor. The results showed that minerals in brown coal affected the product yield of coal pyrolysis and phenols in the low-temperature tar. The minerals in coal played a catalytic role on the generation of carbon monoxide and ethylene, and the decomposition of tar. At the same time, they may suppress the decomposition of intermediates or the producing of final phenols during coal pyrolysis.

scholarly journals Modeling of fixed bed reactor for coal tar hydrogenation via the kinetic lumping approach

2018 ◽  
Vol 1 (3) ◽  
pp. 279-283 ◽  
Author(s):  
Fei Dai ◽  
Yalin Zhang ◽  
Endong Xia ◽  
Zhanquan Zhang ◽  
Zhihua Zhang ◽  
...  
Keyword(s):  
Coal Tar ◽  
Fixed Bed ◽  
Fixed Bed Reactor

Study on Brown Coal Pyrolysis and Catalytic Pyrolysis

2011 ◽  
Vol 236-238 ◽  
pp. 660-663 ◽  
Author(s):  
Gang Wei Zhao ◽  
Wei Qi Yu ◽  
Yun Han Xiao
Keyword(s):  
Thermogravimetric Analysis ◽  
Transition Metal ◽  
Brown Coal ◽  
Alkaline Earth ◽  
Catalytic Pyrolysis ◽  
Coal Pyrolysis ◽  
Combustion Processes ◽  
Catalytic Effects

It is very important to the combustion processes of coal pyrolysis, so the catalytic effects of alkali, alkaline earth and transition metal on the brown coal (Yunnan,China) were investigated with a thermogravimetric analysis. These results show that the active pyrolysis orders are Mg>Ni,Fe>Na,K>Al2O3>CaO, and the maximal increment of conversion is 10.6% in brown coal.

Suppressing secondary reactions of coal pyrolysis by reducing pressure and mounting internals in fixed-bed reactor

2017 ◽  
Vol 25 (4) ◽  
pp. 507-515 ◽  
Author(s):  
Shuai Cheng ◽  
Dengguo Lai ◽  
Zhen Shi ◽  
Leisheng Hong ◽  
Jianling Zhang ◽  
...  
Keyword(s):  
Fixed Bed ◽  
Fixed Bed Reactor ◽  
Coal Pyrolysis ◽  
Secondary Reactions

In-situ catalytic upgrading of coal pyrolysis tar on carbon-based catalyst in a fixed-bed reactor

2016 ◽  
Vol 147 ◽  
pp. 41-46 ◽  
Author(s):  
Lijun Jin ◽  
Xiaoyu Bai ◽  
Yang Li ◽  
Chan Dong ◽  
Haoquan Hu ◽  
...  
Keyword(s):  
Fixed Bed ◽  
Fixed Bed Reactor ◽  
Coal Pyrolysis ◽  
Catalytic Upgrading ◽  
Pyrolysis Tar ◽  
Carbon Based
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