Numerical Study on Effect of Ambient Humidity Variation on Self-heating and Spontaneous Ignition of the Eucalyptus Bark Pile

Fu, Shuo; Chen, Haixiang; Watt, Simon; Sidhu, Harvinder; Luangwilai, Thiansiri; Shu, Yifei

doi:10.1007/s10694-021-01091-4

Cited by 8 publications

(29 citation statements)

References 27 publications

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“…The heat effects of water adsorption and condensation are generally more significant at low temperatures, for example, 20 °C or less, and potentially increase the temperature of relatively dry materials up to 40–50 °C . However, moisture adsorption or condensation due to sudden change in the ambient humidity or addition of liquid water, for example, rainfall, can contribute heat at relatively higher temperatures, causing a temperature spike in the pile , and even triggering the spontaneous ignition of a pile under subcritical conditions. , On the other hand, water vaporization is strongly endothermic. The elevated temperature driving the evaporation and subsequent transport of water vapor outward through diffusion and convection cause heat loss from the pile, which restrains the temperature increase or cools the pile. , Such an effect is more important at relatively higher temperatures. ,, …”

Section: The Process Of Self-heatingmentioning

confidence: 99%

“…Both the biological activity of microorganisms and chemical oxidation of cellulosic materials were considered and the diffusion of oxygen in the pile was also coupled. The model was applied to predict self-heating in compost piles of sewage sludge and the critical conditions and pile temperature and configuration for spontaneous ignition. , The model was extended by Zambra et al to include the heat effect of water vaporization and consider the effects of moisture on both the biological activity and chemical oxidation and by Luangwilai and co-workers to incorporate the effects of convective heat and oxygen transport, , the effects of the moisture on the biological activity and chemical oxidation, and the water evaporation and condensation in the pile. , The developed model was recently applied to describe the self-heating process in stockpiles of wood bark and evaluate the impact of humidity change on self-heating and spontaneous ignition …”

Section: Modeling the Self-heating Processmentioning

confidence: 99%

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Review on Self-Heating of Biomass Materials: Understanding and Description

Sheng

Yao

2022

Energy Fuels

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Storage of bulk biomass materials is essential along the feedstock supply chain of bioenergy production. The self-heating accompanying biomass storage has hazardous consequences. With the increasing biomass utilization for bioenergy production, the risk and economic and environmental concerns about biomass storage have been attracting extensive research attention aimed at understanding the processes of heat generation, evaluating the propensity of a material to self-heating and spontaneous ignition, describing and predicting the self-heating process and consequences in biomass storage, and developing strategies and technologies for storage management. The advances in the understanding and description of heat generation processes including water-associated physical processes, microbiological degradation processes, and chemical oxidative processes during the self-heating in biomass storage are reviewed, with the focus on understanding the processes and their underlying mechanisms, reaction kinetics, and heats of reaction through experimental studies and description of heat generation and self-heating processes through kinetic analyses and modeling. This review highlights the need to improve the mechanistic model description of the self-heating processes and associated material changes and product formation, which demand a better understanding and description of microbial degradation and chemical oxidation through experimental study.

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Section: The Process Of Self-heatingmentioning

confidence: 99%

Section: Modeling the Self-heating Processmentioning

confidence: 99%

Review on Self-Heating of Biomass Materials: Understanding and Description

Sheng

Yao

2022

Energy Fuels

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“…Fu et al [5] presents the temperature increase inside a eucalyptus bark pile due to the water vapor as the ambient humidity increases, emphasizing the importance of vapor sorption favoring spontaneous ignition.…”

Section: Experimental Values and Analysis Of Water Vapor Sorptionmentioning

confidence: 99%

“…6. Fu et al [5] have deduced numerically a temperature rise from 30°C to 74°C when varying the ambient humidity in a eucalyptus bark pile, showing the importance of water vapor sorption and favoring the microbiological activity and the chemical reaction in the days following the temperature rise.…”

Section: Simulation Of the Water Sorption Processmentioning

confidence: 99%

“…and wastes (shells, grain and powders, sludge, etc.). It was discussed that self-heating leading to self-ignition can occur by aerobic fermentation and/or vapor water sorption followed by chemical oxidation in a large quantity of material [1][2][3][4][5] Here, the heat generated by any mechanism is greater than the heat lost to the environment, and consequently, the temperature increases continuously until ignition.…”

Section: Introductionmentioning

confidence: 99%

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Analysis of Spontaneous Ignition of Grass: Chemical Oxidation and Water Vapor Sorption

Font

2021

Fire Technol

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Self-heating of biomass by chemical oxidation, which can cause spontaneous ignition, is a safety and management concern. This process can be accelerated by aerobic fermentation and water vapor sorption. The chemical oxidation and water vapor sorption of grass were studied in a laboratory oven, measuring the variations in weight and the internal temperature of a sphere with grass within a flexible polymeric network. Both processes were simulated to prove that the proposed mathematical model could fit the experimental data. It was observed that the water vapor sorption capacity of the grass was high, so the experimental increase in the internal temperature of a spherical body was around 47 K, from 73°C to 120°C. This fact can be very important because the chemical oxidation of grass accelerates at high temperatures. For scaling, simulation programs were used to study the sorption and oxidation processes with an increase in internal temperature in spherical bodies and infinite plane slabs. These results can be used to obtain those of other geometric symmetries by interpolation. It was deduced that at 70°C and with vapor sorption, the ignition time can be around 3 days to 5 days, while without vapor sorption, the ignition times can be around 110 days to 140 days. For 35°C the ignition times with vapor sorption can be around 12 days to 18 days, while without vapor sorption the ignition times can be around 3700 days to 4500 days. These results can be of interest for warehouses of similar biomass and for forestry research and management groups of wildfires. Graphical Abstract

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Moisture content effects on self-heating in stored biomass: An experimental study

Chen,

Yan,

et al. 2023

Energy

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Numerical Study on Effect of Ambient Humidity Variation on Self-heating and Spontaneous Ignition of the Eucalyptus Bark Pile

Cited by 8 publications

References 27 publications

Review on Self-Heating of Biomass Materials: Understanding and Description

Review on Self-Heating of Biomass Materials: Understanding and Description

Analysis of Spontaneous Ignition of Grass: Chemical Oxidation and Water Vapor Sorption

Moisture content effects on self-heating in stored biomass: An experimental study

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