Simulation analysis of biomass pyrolysis based on the improved CPD model with chain reaction dynamics

The complex composition and molecular structure of biomass lead to more complex and diversified chemical reactions in the pyrolysis. According to the structural characteristics of the reactants, this paper simplifies the pyrolysis process and extends the research focus from the micro-molecular elementary reactions to the macro reaction kinetics. The wheat straw is chosen as the investigated biomass, and the promoted chemical percolation devolatilization (CPD) with modified pseudo-grid and chain reaction kinetics (CRK) pyrolysis models were constructed for predicting the pyrolysis characteristics. Compared with the experimental results, the prediction errors of char, oil and gas production are in a reasonable range of < 10 %. Moreover, the reliability of the model is verified by comparing with the experimental thermogravimetric curve, which shows that the model could well predict the mass loss, product distribution and component characteristics, and provides a reasonable prediction for the pyrolysis of biomass.

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Simulation analysis of Co-Pyrolysis of oil shale and wheat straw based on the combination of chain reaction kinetics and improved CPD models

Energy Conversion and Management ◽

10.1016/j.enconman.2021.114405 ◽

2021 ◽

Vol 243 ◽

pp. 114405

Author(s):

Bin Chen ◽

Mengxue Yuan ◽

Yulong You ◽

Sha Wang ◽

Jun Shen ◽

...

Keyword(s):

Reaction Kinetics ◽

Wheat Straw ◽

Oil Shale ◽

Simulation Analysis ◽

Chain Reaction

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Reaction Kinetics and Product Distribution of Slow Pyrolysis of Indian Textile Wastes

International Journal of Chemical Reactor Engineering ◽

10.1515/1542-6580.2662 ◽

2012 ◽

Vol 10 (1) ◽

Cited By ~ 11

Author(s):

Ranjana Chowdhury ◽

Aparna Sarkar

Keyword(s):

Oil And Gas ◽

Structural Characteristics ◽

Kinetic Scheme ◽

Packed Bed ◽

Product Distribution ◽

Nitrogen Atmosphere ◽

Indian Origin ◽

Different Temperatures ◽

Exponential Factors ◽

Parallel Reactions

Abstract In this present investigation, textiles samples of non-polymeric nature, e.g, cotton, silk etc. of Indian origin were pyrolysed in a 50 mm diameter and 640 mm long packed bed pyrolyser placed in a tubular furnace from 573K to 1173K in a nitrogen atmosphere. Experiments were designed to investigate the effects of temperature of pyrolysis on yields of char, pyro-oil and gas and their characteristics. A kinetic scheme has been proposed where two parallel reactions occur simultaneously to produce volatiles and char. The kinetic rate constants of both the reactions have been determined in the temperature range under study. The activation energies and pre-exponential factors of all products (solid reactant, volatile and char) have been determined. A mathematical model for the pyrolysis of textile waste has been developed using the kinetic parameters determined under the present study. Calorific values of pyro-oil and char obtained at different temperature have been determined. The structural characteristics of char at different temperatures of 573, 873 and 1173K has also been analysed using SEM.

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