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

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.

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Kinetics of coal and catalytic coal pyrolysis reactions in a fixed bed reactor

Fuel ◽

10.1016/0016-2361(93)90642-f ◽

1993 ◽

Vol 72 (5) ◽

pp. 709

Author(s):

P.K. Dey

Keyword(s):

Fixed Bed ◽

Fixed Bed Reactor ◽

Coal Pyrolysis ◽

Kinetics Of

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

Fuel Processing Technology ◽

10.1016/j.fuproc.2015.12.028 ◽

2016 ◽

Vol 147 ◽

pp. 41-46 ◽

Cited By ~ 42

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

Advanced Materials Research ◽

10.4028/www.scientific.net/amr.512-515.1129 ◽

2012 ◽

Vol 512-515 ◽

pp. 1129-1136 ◽

Cited By ~ 2

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.

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CFD Simulation of Catalytic Cracking of n-Heptane in a Fixed Bed Reactor

Petroleum & Petrochemical Engineering Journal ◽

10.23880/ppej-16000220 ◽

2020 ◽

Vol 4 (2) ◽

pp. 1-8

Author(s):

Hosseini SA

Keyword(s):

Catalytic Cracking ◽

Cfd Simulation ◽

Fixed Bed ◽

Particle Diameter ◽

Reaction Scheme ◽

Fixed Bed Reactor ◽

Coke Deposition ◽

Three Dimension ◽

Secondary Reactions ◽

Cracking Process

This work aims to three-dimension computational fluid dynamics (CFD) simulation of n-heptane catalytic cracking in fixed bed reactor (L=0.80 m) and to promote the cracking model of n-heptane using CFD. The catalyst granules were located in middle section of the reactor. The reaction scheme of n-heptane catalytic cracking was involved one primary reaction and 24 secondary reactions. Catalytic cracking process with a model of 25 molecular reactions was simulated by Fluent 6.0 software. The ratio of tube-to-particle diameter was considered N=2. The contours of coke deposition rate, vorticity, velocity and coke precursors and their relations along the reactor were predicted and discussed.

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