Emission characteristics of a pyrolysis-combustion system for the co-production of biochar and bioenergy from agricultural wastes

Dunnigan, Lewis; Morton, Benjamin J.; Ashman, Peter J.; Zhang, Xiangping; Kwong, Chi Wai

doi:10.1016/j.wasman.2018.05.004

Cited by 34 publications

(12 citation statements)

References 41 publications

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“…At 700 °C, the total biochar yields from the chicken-litter and rice husk samples were 40 and 45 wt %, and the gas contents were observed to increase with temperature and achieved maximum yields of 22 and 21 wt %, respectively. This was due to the higher conversion rate of the organic fractions into gas at higher pyrolysis temperatures. , A similar gas production pattern was observed by Dunnigan et al during the pyrolysis of agricultural waste at 400 to 800 °C. The dominant volatile species from both samples were CO 2 followed by CO and CH 4 .…”

Section: Resultssupporting

confidence: 79%

Energy Conversion Efficiency of Pyrolysis of Chicken Litter and Rice Husk Biomass

Weldekidan

Strezov

et al. 2019

Energy Fuels

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Pyrolysis is a well-established method of converting biomass to different types of value-added products, such as high energy density biofuels and chemicals. In this work, chicken-litter waste and rice husk were pyrolyzed at different temperatures with the aim of investigating the thermal behavior and energy recovery potential of the feedstocks. Computer-aided thermal analysis and thermogravimetric analysis were employed to study the pyrolysis properties of each biomass in a temperature-controlled regime. The specific heats of chicken litter and rice husk samples during their pyrolysis and the energy content of their pyrolysis products were investigated to determine the energy required to complete the pyrolysis of each sample and the energy recovery potential of each pyrolytic product. Most of the volatile products were evolved at 350 to 450 °C with CO2, CO, and CH4 being the dominant gas products from both samples throughout the pyrolysis process. At 500 °C and at a heating rate of 10 °C/min, the gas, bio-oil, and biochar yields from chicken litter and rice husk were in the ranges of 18 to 19, 35 to 39, and 42 to 47 wt %, respectively, with a total recoverable energy value of 12.7 MJ/kg from chicken litter and 13.9 MJ/kg from rice husk. The energy consumed to heat the samples to the final pyrolysis temperature of 500 °C was also estimated to be 1.2 and 0.8 MJ per kilogram of chicken litter and rice husk, respectively. With the measured values, the efficiency of the pyrolysis of chicken litter and rice husk samples is estimated to be 84% and 89%, respectively, assuming the heat required to carry out the pyrolysis process is supplied by combustion of the evolved pyrolytic gas products. If the pyrolysis is instead driven by solar thermal energy, the overall efficiency will increase to 92% for the chicken litter and 94% for the rice husk pyrolysis.

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Section: Resultssupporting

confidence: 79%

Energy Conversion Efficiency of Pyrolysis of Chicken Litter and Rice Husk Biomass

Weldekidan

Strezov

et al. 2019

Energy Fuels

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“…A literature review showed that studies on pyrolysis of orchard wastes were mainly concerned on olive trees [ 28 , 29 , 30 , 31 ] and vineyard pruning residues [ 32 , 33 , 34 , 35 ]. Because of the insufficient amount of data on pruning residues from the main orchard trees cultivated in the territory of our country (Poland), we focused our study on the production and analysis of the biochars obtained from pruning residues of apple, pear, and plum.…”

Section: Introductionmentioning

confidence: 99%

Pyrolysis of Pruning Residues from Various Types of Orchards and Pretreatment for Energetic Use of Biochar

et al. 2021

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The routine pruning and cutting of fruit trees provides a considerable amount of biowaste each year. This lignocellulosic biomass, mainly in the form of branches, trunks, rootstocks, and leaves, is a potential high-quality fuel, yet often is treated as waste. The results of a feasibility study on biochar production by pyrolysis of residues from orchard pruning were presented. Three types of biomass waste were selected as raw materials and were obtained from the most common fruit trees in Poland: apple (AP), pear (PR), and plum (PL) tree prunings. Two heating rates and three final pyrolysis temperatures were applied. For the slow (SP) and fast pyrolysis (FP) processes, the heating rates were 15 °C/min and 100 °C/min, respectively. The samples were heated from 25 °C up to 400, 500, and 600 °C. Chemical analyses of the raw materials were conducted, and the pyrolysis product yields were determined. A significant rise of higher heating value (HHV) was observed for the solid pyrolysis products, from approximately 23.45 MJ/kg for raw materials up to approximately 29.52 MJ/kg for pyrolysis products at 400 °C, and 30.53 MJ/kg for pyrolysis products at 600 °C. Higher carbon content was observed for materials obtained by fast pyrolysis conducted at higher temperatures.

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“…Использование солнечной энергии значительно сокращает загрязняющие выбросы [23]. Использование процессов пиролизного горения может потенциально минимизировать проблемы с выбросами [24]. Экономия энергии также значительно влияет на сокращение выбросов [25].…”

Section: обзор литературыunclassified

Energy and Environment Assessment of Agricultural Application of Power Generating Sources

Брюханов

Subbotin

Тимофеев

et al. 2019

Engineering Technologies and Systems

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Introduction. Recently the issue of decentralised (autonomous) power supply of certain rural consumers has been increasingly considered. Various small power generators using local and renewable energy sources can be applied for this purpose. So a consumer must choose the best-suited energy-generating source. Materials and Methods.The findings of energy audits, which were conducted by the Institute from 2003 to the present day, were used to evaluate energy consumers and determine operation modes of equipment and load schedules. Complex index of the negative impact of heat and electricity generation on the environment was determined using the Spesivtsev ‒ Drozdov method of logical-linguistic modelling based on expert assessments. Results. Energy sources can be divided into traditional (diesel generators and gas generator plants) or renewable ones (wind turbines, solar collectors, mini hydro systems). Energy source is chosen either with the help of the economic criterion, being the cost of one k·Wh of energy or the criterion of environmental compatibility, or total specific emission of pollutants from energy generation at local generating sources (g/k·Wh). Here, not only the quantity of emissions, but also the harmful effect on the environment is considered. Discussion and Conclusion. For the choice of energy supply sources, the coefficient of energy-ecological compatibility is proposed, being the product of the cost of one k·Wh of energy generated and specific emission of pollutants. The optimal value of this factor is the smallest, which accounts for both economic and environmental feasibility of energy generating sources.

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Emission characteristics of a pyrolysis-combustion system for the co-production of biochar and bioenergy from agricultural wastes

Cited by 34 publications

References 41 publications

Energy Conversion Efficiency of Pyrolysis of Chicken Litter and Rice Husk Biomass

Energy Conversion Efficiency of Pyrolysis of Chicken Litter and Rice Husk Biomass

Pyrolysis of Pruning Residues from Various Types of Orchards and Pretreatment for Energetic Use of Biochar

Energy and Environment Assessment of Agricultural Application of Power Generating Sources

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