scholarly journals Study on the Mechanism of Gas Component Release for Biomass Pyrolysis

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.

scholarly journals APPLICATION OF THE BIOMASS PYROLISIS PRODUCTS AS A REBURNING FUEL FOR NITROGEN OXIDES REDUCTION: TESTING THE CHEMICAL KINETICS MECHANISM

2020 ◽  
Vol 42 (2) ◽  
pp. 92-98
Author(s):  
S.G. Kobzar ◽  
A.A. Khalatov
Keyword(s):  
Nitrogen Oxides ◽  
Chemical Kinetics ◽  
Coal Combustion ◽  
Mass Fraction ◽  
Biomass Pyrolysis ◽  
Pyrolysis Gas ◽  
Pyrolysis Products ◽  
Nitrogen Oxides Reduction ◽  
Kinetics Of ◽  
Pyrolysis Gases

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%.

scholarly journals Pyrolysis characteristics, kinetics, and its product characteristics of grape stem

BioResources ◽  
2019 ◽  
Vol 14 (4) ◽  
pp. 7901-7919 ◽  
Author(s):  
Yimeng Zhang ◽  
Liangcai Wang ◽  
Yishuang Wu ◽  
Yu Chen ◽  
Huanhuan Ma ◽  
...  
Keyword(s):  
Gas Chromatography Mass Spectrometry ◽  
Thermochemical Conversion ◽  
Pyrolysis Gas ◽  
Pyrolysis Products ◽  
Pyrolysis Reaction ◽  
Pyrolysis Characteristics ◽  
Model Free ◽  
Integral Methods ◽  
Weight Loss Behavior ◽  
Rapid Pyrolysis

Grape stem is a kind of agricultural and forestry waste. A fundamental understanding of grape stem pyrolysis behavior and kinetics is essential for its efficient thermochemical conversion. Thermogravimetric infrared spectroscopy and pyrolysis gas chromatography-mass spectrometry, combined with two model-free integral methods: Flynn-Wall-Ozawa (FWO) and Kissinger-Akahira-Sunose (KAS) were used to investigate the weight loss behavior, the distribution and content of rapid pyrolysis products, the release law of small molecule pyrolysis gases, and the pyrolysis activation energy during pyrolysis. The results showed that the main pyrolysis reaction temperature ranged from 240 °C to 690 °C. The pyrolysis reaction of grape stems at 200 °C to 700 °C was divided into three stages: 0.15 < α < 0.35, 0.35 < α < 0.65, and 0.65 < α < 0.75, which corresponded to the main pyrolysis stages of hemicellulose, cellulose, and lignin, respectively. The products of rapid pyrolysis at 290 °C were mainly composed of acids and sugars, while the products at 355 °C were mainly phenolics. This study aims to provide a theoretical reference for the pyrolysis gasification test of grape stem.

Low-Carbon Clean Technology for Waste Energy Recovery in Power Plants Based on Green Environmental Protection

2021 ◽  
Author(s):  
Yong Tian ◽  
Wen-Jing Liu ◽  
Qi-jie Jiang ◽  
Xin-Ying Xu
Keyword(s):  
Power Generation ◽  
Power Plants ◽  
Biomass Energy ◽  
Energy Utilization ◽  
Pollutant Emissions ◽  
Total Power ◽  
Economic Losses ◽  
Biomass Waste ◽  
Emission Analysis ◽  
Total Power Consumption

With the development of biomass power generation technology, biomass waste has a more excellent recycling value. The article establishes a biomass waste inventory model based on the material flow analysis method and predicts raw material waste’s energy utilization potential. The results show that the amount of biomass waste generated from 2016 to 2020 is on the rise. In 2020, biomass waste’s energy utilization can reach 107,802,300 tons, equivalent to 1,955.28PJ of energy. Through biomass energy analysis and emission analysis, the results show that the biomass waste can generate 182.02 billion kW⋅h in 2020, which can replace 35.9% of the region’s total power consumption, which is compared with the traditional power generation method under the same power generation capacity. Power generation can reduce SO2 emissions by 250,400 tons, NOx emissions by 399,300 tons, and PM10 emissions by 49,700 tons. Reduce direct economic losses by 712 million yuan. Therefore, Chinese promotion of the recycling of biomass waste and the acceleration of the biomass energy industry’s development is of great significance for reducing pollutant emissions and alleviating energy pressure.

scholarly journals Techno-Economic Analysis of Biomass Energy Utilization through Gasification Technology for Sustainable Energy Production and Economic Development in Nigeria

2018 ◽  
Vol 2018 ◽  
pp. 1-16 ◽  
Author(s):  
Gbeminiyi M. Sobamowo ◽  
Sunday J. Ojolo
Keyword(s):  
Economic Analysis ◽  
Rural Areas ◽  
Financial Incentives ◽  
Capital Investment ◽  
Biomass Gasification ◽  
Biomass Energy ◽  
Energy Utilization ◽  
Maintenance Cost ◽  
Selling Price ◽  
Gasification Technology

Nigeria has not been able to provide enough electric power to her about 200 million people. The last effort by the federal government to generate 6000 MW power by the end of 2009 failed. Even with the available less than 6000 MW of electricity generated in the country, only about 40% of the population have access to the electricity from the National Grid, out of which, urban centers have more than 80% accessibility while rural areas, which constitute about 70% of the total population, have less than 20% of accessibility to electricity. This paper addresses the possibility of meeting the energy demand in Nigeria through biomass gasification technology. The techno-economic analysis of biomass energy is demonstrated and the advantages of the biomass gasification technology are presented. Following the technical analysis, Nigeria is projected to have total potential of biomass of about 5.5 EJ in 2020 which has been forecast to increase to about 29.8 EJ by 2050. Based on a planned selling price of $0.727/kWh, the net present value of the project was found to be positive, the cost benefit ratio is greater than 1, and the payback period of the project is 10.14 years. These economic indicators established the economic viability of the project at the given cost. However, economic analysis shows a selling price of $0.727/kWh. Therefore, the capital investment cost, operation and maintenance cost, and fuel cost can be reduced through the development of the gasification system using local materials, purposeful and efficient plantation of biomass for the energy generation, giving out of financial incentives by the government to the investors, and locating the power plant very close to the source of feedstock generation.

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

2018 ◽  
Vol 32 (10) ◽  
pp. 10194-10201 ◽  
Author(s):  
Magnus Fürst ◽  
Pino Sabia ◽  
Marco Lubrano Lavadera ◽  
Gianmarco Aversano ◽  
Mara de Joannon ◽  
...  
Keyword(s):  
Chemical Kinetics ◽  
Biomass Pyrolysis ◽  
Low Oxygen ◽  
Pyrolysis Products

scholarly journals Pyrolysis Products Distribution of Enzymatic Hydrolysis Lignin with/without Steam Explosion Treatment by Py-GC/MS

Catalysts ◽  
2020 ◽  
Vol 10 (2) ◽  
pp. 187
Author(s):  
Yuguo Dong ◽  
Xinyu Lu ◽  
Chengjuan Hu ◽  
Liang Li ◽  
Qixiang Hu ◽  
...  
Keyword(s):  
Enzymatic Hydrolysis ◽  
Steam Explosion ◽  
Pyrolysis Product ◽  
Product Distribution ◽  
Hydroxyl Group ◽  
Hydrolysis Lignin ◽  
Pyrolysis Gas ◽  
Pyrolysis Products ◽  
Structural Framework ◽  
Main Component

This paper investigated the pyrolytic behaviors of enzymatic hydrolysis lignin (EHL) and EHL treated with steam explosion (EHL-SE) by pyrolysis-gas chromatography/mass spectrometer (Py-GC/MS). It was shown that the main component of the pyrolysis products was phenolic compounds, including G-type, H-type, S-type, and C-type phenols. With different treatment methods, the proportion of units in phenolic products had changed significantly. Meanwhile, proximate, elemental, and FTIR analysis of both lignin substrates were also carried out for a further understanding of the lignin structure and composition with or without steam explosion treatment. FTIR result showed that, after steam explosion treatment, the fundamental structural framework of the lignin substrate was almost unchangeable, but the content of lignin constituent units, e.g., hydroxyl group and alkyl group, evidently changed. It was noticeable that 2-methoxy-4-vinylphenol with 11% relative content was the most predominant pyrolytic product for lignin after steam explosion treatment. Combined with the above analysis, the structural change and pyrolysis product distribution of EHL with or without steam explosion treatment could be better understood, providing more support for the multi-functional utilization of lignin.

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