Measurements of wood pellets self-heating kinetic parameters using isothermal calorimetry

Guo, Wendi; Trischuk, Ken; Bi, Xiaotao; Lim, C. Jim; Sokhansanj, Shahab

doi:10.1016/j.biombioe.2014.02.022

Cited by 32 publications

(50 citation statements)

References 23 publications

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“…From the previous study, we learned that the self‐heating rate is small at room temperature (23 °C) and increases at temperatures higher than 40 °C. At lower temperatures or in a small container, the released heat can dissipate quickly from the bulk pellets so that a stationary state can be reached and no crossing point appears in the temperature profile, as shown in Figure a.…”

Section: Resultsmentioning

confidence: 99%

“…With the same chemical composition as wood (i.e., cellulose, hemicellulose, and lignin), wood pellets tend to decompose and generate gasses and heat during storage. According to our previous studies, the self‐heating of wood pellets strongly depends on the reaction temperature and releases heat in a quantity of μW/(g s) at temperatures of 30–50 °C . As the temperature rises, reactions, especially pyrolysis, become more significant when oxygen is limited in the wood pellets storage space.…”

Section: Introductionmentioning

confidence: 99%

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Investigation of wood pellets self‐heating kinetics and thermal runaway phenomena using lab scale experiments

Guo

Lim

et al. 2019

Can J Chem Eng

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The phenomena of spontaneous combustion and thermal runaway in wood pellets storage were investigated using lab‐scale experiments in the temperature range of 100–200 °C. The critical temperatures were determined for four sizes of reactors. The kinetic parameters of the self‐heating were determined using three methods, the Frank‐Kamenetskii's method, crossing point method, and numerical curve fitting method. Mean values of activation energy (E) of 78.7 ±0.8 kJ/mol and self‐heating rate constant (∆ rhA) of (4.22 ±2.5) × 10 6 kJ/(kg s) were obtained for four type of wood pellets (made from whitewood) samples from different pellet producers in British Columbia. Finally, a two‐dimensional numerical model was developed to predict the temperature development during self‐heating and the critical temperature for known sizes of reactors.

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Section: Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Investigation of wood pellets self‐heating kinetics and thermal runaway phenomena using lab scale experiments

Guo

Lim

et al. 2019

Can J Chem Eng

Self Cite

View full text Add to dashboard Cite

show abstract

“…A general trend is that the power of the heat generation increases rapidly to a maximum and then decreases gradually with time. Such a trend was commonly observed by using closed vessels in the isothermal micro-calorimeter to investigate the self-heating of coals [36] and biofuels [25,26,30]. The initial increase to the peak may be mainly due to the heat release of the rapid adsorption of oxygen on the material surface, which eventually approaches the saturation balanced with surface oxygen-complex reactions [23,24,36].…”

Section: Tga and Dsc Profilesmentioning

confidence: 93%

“…When compared with the cornstalk, 250°C char has lower heat powers at the three lower temperatures (35, 45 and 55°C) but a much higher heat power at 65°C before $20 h. The reason is that heat generation from 250°C char is mainly due to oxygen chemisorption and chemical oxidation. In contrast, the heat effect of the raw biomass is complex, including not only the chemical oxidation but also biological oxidation [30,37]. Torrefaction at 250°C removed the reactive components (sugars, starch, etc.)…”

Section: Heat Flux From Low Temperature Oxidation Measured By Isothermentioning

confidence: 97%

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Low temperature oxidation and its kinetics of cornstalk chars

Fan

Sheng

2016

Fuel

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Development of a screening test based on isothermal calorimetry for determination of self‐heating potential of biomass pellets

Larsson¹,

Lönnermark²,

Blomqvist³

et al. 2017

Fire and Materials

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Summary For the risk for spontaneous combustion in storage of biomass pellets to be assessed, it is important to know how prone the fuel is to self‐heating. There are traditional methods that are used to determine self‐heating characteristics of fuels, eg, basket heating tests. The results from basket heating tests indirectly give the reactivity from a series of tests at high temperatures. This paper presents a sensitive screening test procedure for biomass pellets using isothermal calorimetry for direct measurement of the heat production rate at typical bulk storage temperatures. This method can be used to directly compare the reactivity of different batches of biomass pellets. The results could be used, eg, by storage security managers to gain better knowledge of their fuels propensity for self‐heating and thereby for safer storage. A large number of tests have been performed to develop the test procedure presented. Different parameters, such as temperature, type of the test sample (powder/crushed or pellets), mass of test sample, and preheating time, have been varied. Furthermore, gas concentrations in the sample ampoule have been measured before and after some tests to study the oxygen consumption and the formation of CO and CO2. Three different types of pellets with different characteristics were tested to assess the variation in behaviour. Based on these tests, a screening test procedure is presented with a test temperature of 60°C, a sample size of 4 g, a 15‐minute preheating period at the test temperature, and 24‐hour test duration.

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Measurements of wood pellets self-heating kinetic parameters using isothermal calorimetry

Cited by 32 publications

References 23 publications

Investigation of wood pellets self‐heating kinetics and thermal runaway phenomena using lab scale experiments

Investigation of wood pellets self‐heating kinetics and thermal runaway phenomena using lab scale experiments

Low temperature oxidation and its kinetics of cornstalk chars

Development of a screening test based on isothermal calorimetry for determination of self‐heating potential of biomass pellets

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