The composition of gaseous products of low-temperature oxidation of coal mass and biomass depending on temperature

Derychová, Kateřina; Perďochová, Michaela; Věžníková, Hana; Bernatík, Aleš

doi:10.1016/j.jlp.2016.05.022

Cited by 8 publications

(4 citation statements)

References 10 publications

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“…They concluded that CO could be used as an index gas at coal temperatures reaching 50 °C, and its concentration rapidly increased at temperatures exceeding 130 °C. Katerina Derychova et al heated coal samples at 50–200 °C and found that the CO/CO 2 concentration ratio was strongly dependent on the temperature and could therefore be used for studying coal temperature. Additionally, Graham combined the CO/O 2 (R 1 ), CO 2 /O 2 (R 2 ), and CO/CO 2 (R 3 ) concentration ratio parameters as composite indicators to systematically predict the coal temperature .…”

Section: Introductionmentioning

confidence: 99%

Experimental Study on the Molecular Hydrogen Release Mechanism during Low-Temperature Oxidation of Coal

Wang

Xue

et al. 2017

Energy Fuels

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Although H2 gas is used in coal mines as an important indicator to reflect the state of coal spontaneous combustion, the gas production of H2 at low temperature has been scarcely reported in the literature. In this paper, the modes and release mechanism of molecular hydrogen were investigated for three different coal ranks below 200 °C. Batch reactor tests were performed in combination with chromatographic analysis of the coal oxidation process. The experimental results showed that molecular hydrogen release mainly originated from coal oxidation rather than thermal decomposition of inherent hydrogen-containing groups. The amount of hydrogen released increased with the coal rank. The H2 release process during low-temperature oxidation typically proceeds in two phases, namely H2 slow release (T < 100 °C) and H2 accelerated release (T > 100 °C) phases. Experiments with model compounds revealed aldehyde compounds to noticeably produce H2. Coal plays a positive role in promoting the aldehyde groups to release H2 and CO2, but an opposite trend was observed in the case of CO. As revealed by Fourier transform infrared (FTIR) spectroscopy, the amount of aliphatic structures significantly decreased with the oxidation intensity, and a drastic increase in the aldehyde content was found at temperatures above 120 °C. Additionally, the path for the formation of H2 during low-temperature oxidation of coal was provided.

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Section: Introductionmentioning

confidence: 99%

Experimental Study on the Molecular Hydrogen Release Mechanism during Low-Temperature Oxidation of Coal

Wang

Xue

et al. 2017

Energy Fuels

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“…Moreover, results show that oxygen is at least chemisorbed on a carbon atom located on the coal surface [21] and forms a complex which is further decomposed into gaseous products [22] which are mainly carbon oxides (CO, CO 2 ) and water [23] [24]. The quantities of adsorbed oxygen [25] and gaseous products generated [26] are very low when there is no ignition. However, there is no consensus about the mechanism of the reaction [19].…”

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confidence: 99%

“…This might be explained by the use of different raw material and/or by the use of different particle and bed sizes. Carbon oxides, water and aliphatic hydrocarbons were measured by [26] as gaseous products generated by the low temperature oxidation of wood. However, [27] shows that the amount of water and aliphatic hydrocarbons generated are weak compared to the amount of carbon oxides produced.…”

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confidence: 99%

Reactor scale study of self-heating and self-ignition of torrefied wood in contact with oxygen

Evangelista

Arlabosse

Govin

et al. 2018

Fuel

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International audienceThis experimental work aims at investigating the potential development of self-heating when torrefied wood chips enter into contact with oxygen. Two kilograms of dried beech chips have been torrefied under nitrogen in a cylindrical reactor at 250 °C or 285 °C. The temperature was then leveled down between 100 °C and 160 °C and nitrogen flow was replaced by oxygen-containing flow. Influences of oxygen volumetric fraction and sweeping gas flow rate were investigated. Temperatures at different bed locations and gaseous product volumetric fractions at the bed output were monitored continuously. In some of the experiments a limited temperature rise was observed while in others a temperature runaway occurred. Thermal considerations indicate a clear enhancement of self-heating propensity with the severity of torrefaction. Gas phase analysis and molecule oxygen balance reveal an adsorption mechanism pathway and a higher rate of oxygen adsorption for the severely torrefied wood. Lowering the oxygen volumetric fraction or increasing the flow rate decrease self-heating behavior and was used to stop self-ignition of the bed

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“…The method indicating the state of self-heating based on the analysis of gaseous products from heating has been used for many years, especially for coal materials. As the study of Derychova et al (2016) shows, majority of gaseous products from coal and biomass are qualitatively identical. Therefore, analysis of gaseous products can also be used in the indication of the temperature of stored biomass.…”

Section: Introductionmentioning

confidence: 96%

Inclination to self-ignition and analysis of gaseous products of wood chips heating

Skrizovska

Věžníková

Roupcová

2020

Acta Chimica Slovaca

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This paper focuses on the assessment of the inclination to self-ignition of various types of wood chips according to the methodology of European standard EN 15188. The study also assesses the effect of heating temperatures on the composition and quantity of gaseous products of heating. Gases were analysed using an infrared spectrometer with Fourier transformation. From the measured results it was found that the inclination to self-ignition differs for various samples of wood chips. The paper discusses certain parameters assumed to affect the inclination of biomass to self-ignite. When assessing the effect of temperature on the composition of gaseous products, a sample of forest wood chips heated at temperatures from 50 to 150 °C resulted in the following gaseous products: carbon dioxide, carbon monoxide, water and aliphatic hydrocarbons; their concentrations increase with the increasing temperature. Carbon oxides have been proposed as indicators of the state of stored materials self-heating. Observations presented in this paper can be used as data for elaborating safety instructions for storage of fuels based on solid biomass.

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The composition of gaseous products of low-temperature oxidation of coal mass and biomass depending on temperature

Cited by 8 publications

References 10 publications

Experimental Study on the Molecular Hydrogen Release Mechanism during Low-Temperature Oxidation of Coal

Experimental Study on the Molecular Hydrogen Release Mechanism during Low-Temperature Oxidation of Coal

Reactor scale study of self-heating and self-ignition of torrefied wood in contact with oxygen

Inclination to self-ignition and analysis of gaseous products of wood chips heating

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