Optimization of Chemical Kinetics for Methane and Biomass Pyrolysis Products in Moderate or Intense Low-Oxygen Dilution Combustion

The mechanisms of chemical kinetics of the Reburning process using pyrolysis gases as a reburn fuel are determined. It has been shown that CO, CO2, H2 have very little effect on the reduction of the nitrogen oxides under conditions characteristic for the coal combustion, and hydrocarbons play the major contribution to the reduction of the nitrogen oxides. The results of the test calculations showed that the process of the nitrogen oxides reduction by the biomass pyrolysis products can be calculated by a simplified mechanism of the chemical kinetics of the Reburning process by replacing hydrocarbons with one substance (with a close carbon/hydrogen ratio as in the real pyrolysis gas mixture), provided that the mass fraction of carbon is preserved, fed to the reduction of nitrogen oxides unchanged. This approach significantly reduces machine time and calculates the nitrogen oxides reducing efficiency by Reburning technology with an accuracy of 17%.

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Study on the Mechanism of Gas Component Release for Biomass Pyrolysis

E3S Web of Conferences ◽

10.1051/e3sconf/201911803058 ◽

2019 ◽

Vol 118 ◽

pp. 03058

Author(s):

Hongtao Li ◽

Li Wang ◽

Yunguang Ji ◽

Shuqi Xue ◽

Zhenhui Wang

Keyword(s):

Biomass Energy ◽

Energy Utilization ◽

Thermochemical Conversion ◽

Release Mechanism ◽

Correction Coefficient ◽

Superposition Method ◽

Biomass Pyrolysis ◽

Yield Model ◽

Pyrolysis Gas ◽

Pyrolysis Products

Biomass energy utilization can solve the contradiction between economic development and energy and environment. Biomass pyrolysis technology is not only one of the thermochemical conversion technologies, but also the necessary stage of biomass gasification, which has become a hot academic research topic. Firstly, based on the pyrolysis experimental data of cellulose, hemicellulose and lignin, the analytical expressions of pyrolysis gas mass yields of different biomass components varying with temperature were obtained; then, the prediction of pyrolysis products was obtained by mass component superposition method, and the correction coefficient of biomass pyrolysis gas yield model was obtained based on the comparison between the average yield of biomass pyrolysis gas and the predicted value of pyrolysis products; finally, the gas release mechanism model of biomass pyrolysis was obtained. This study provides theoretical basis and technical support for the development of biomass utilization technology.

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Experimental Study on Catalytic Pyrolysis of Biomass Pellet

Applied Mechanics and Materials ◽

10.4028/www.scientific.net/amm.291-294.320 ◽

2013 ◽

Vol 291-294 ◽

pp. 320-323 ◽

Cited By ~ 1

Author(s):

Ai Jun Xue ◽

Ji Hong Pan ◽

Mao Cheng Tian

Keyword(s):

Catalytic Pyrolysis ◽

Test Bench ◽

Biomass Gasification ◽

Biomass Pyrolysis ◽

Corn Straw ◽

Pyrolysis Products ◽

Volume Percentage ◽

Pyrolysis Characteristics ◽

Pyrolysis Of Biomass ◽

Biomass Pellet

In the present study, catalytic pyrolysis characteristics of corn straw pellet were studied in biomass pyrolysis test bench. The effect of content of CaO added in biomass pellet on pyrolysis products was investigated. The results showed that: with the increase of CaO content, the yield of tar decreased ,and the yield of char and gas increased. Among gas compositions, the volume percentage of CO、H2、CH4 increased, while the volume percentage of CO2 decrease greatly. The Calorific values of the gas increase distinctly. The results have significant theoretical guidance on the application of biomass pellets in biomass gasification equipments.

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MODIFIED BIOCHAR: A REVIEW ON MODIFICATIONS OF BIOCHAR TOWARDS ITS ENHANCED ADSORPTIVE PROPERTIES

Proceedings of the 19th Conference for Junior Researchers „Science – Future of Lithuania“ ◽

10.3846/aainz.2016.03 ◽

2016 ◽

Author(s):

Valeriia Chemerys ◽

Edita Baltrėnaitė

Keyword(s):

Carbon Sequestration ◽

Health Sciences ◽

Production Costs ◽

Biomass Pyrolysis ◽

Low Oxygen ◽

Key Factors ◽

Factors Affecting ◽

Aromatic Carbon ◽

Modified Biochar ◽

Adsorptive Properties

Rich in aromatic carbon and minerals, biochar is produced by biomass pyrolysis at temperatures ranging from 350 °C to 1000 °Cin low-oxygen environment. Traditionally biochar was applied to soilto improve its fertility and carbon sequestration. However, due to low production costs, availability of the feedstock and specific biochar properties related to adsorption of contaminants from aqueous solutions, biochar has gained much interest in other fields, e.g. health sciences and engineering. The aim of the study was to distinguish the types of biochar modifications and to determine biochar characteristics contributing to adsorption. This paper is focused on recentexperimental studies related tobiochar modifications enhancing the adsorption of contaminants. Mechanisms of adsorption and the key factors affecting adsorptive properties of biochar are analyzed. Finally, recommendations for further research in designing the biochar are proposed.

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