Explosive oxidation of hydrogen sulphide: self-heating, chain-branching and chain-thermal contributions to spontaneous ignition

1974 ◽  
Vol 70 (0) ◽  
pp. 2338 ◽  
Author(s):  
Peter Gray ◽  
Malcolm E. Sherrington
Keyword(s):  
Hydrogen Sulphide ◽  
Spontaneous Ignition ◽  
Chain Branching ◽  
Self Heating ◽  
Oxidation Of Hydrogen

scholarly journals Effect of wood biomass components on self-heating

2021 ◽  
Vol 8 (1) ◽  
Author(s):  
Nozomi Miyawaki ◽  
Takashi Fukushima ◽  
Takafumi Mizuno ◽  
Miyao Inoue ◽  
Kenji Takisawa
Keyword(s):  
Moisture Content ◽  
Inductively Coupled Plasma ◽  
Optical Emission ◽  
Chemical Oxidation ◽  
Spontaneous Ignition ◽  
Emission Spectrometry ◽  
Inductively Coupled ◽  
Self Heating ◽  
Inorganic Substances ◽  
Before And After

AbstractBiomass may ignite due to biological oxidation and chemical oxidation. If this phenomenon (spontaneous ignition) is controlled, it would be possible to produce biochar at a lower cost without the need for an external heat resource. We investigated if self-heating could be controlled by using sawdust and bark chips. When sawdust and bark chips were used under controlled conditions, the bark chips temperature increased to the torrefaction temperature. The ash content of bark chips was ~ 2%d.b. higher than that of sawdust; consequently, the inorganic substances contained in the bark chips might affect the self-heating. Self-heating was suppressed when inorganic substances were removed by washing with water. Therefore, the inorganic substances in the biomass might have affected self-heating. The inorganic element contents of the bark chips were measured by inductively coupled plasma optical emission spectrometry before and after washing. The potassium content of the bark chips was reduced remarkably by washing, and there was a possible influence of potassium on self-heating. Finally, the effect of moisture content on self-heating was investigated to obtain stable reactivity. Thus, at a moisture content of 40%w.b., a steady self-heating behavior may be realized.

CCXLIV.—The kinetics of the oxidation of hydrogen sulphide. Part I

1931 ◽  
Vol 0 (0) ◽  
pp. 1809-1827 ◽  
Author(s):  
Harold Warris Thompson ◽  
Norman Stanley Kelland
Keyword(s):  
Hydrogen Sulphide ◽  
Oxidation Of Hydrogen ◽  
Kinetics Of

scholarly journals Efficacy and Risk of Aeration to Prevent Self-heating Powder Bed from Spontaneous Ignition.

1993 ◽  
Vol 30 (7) ◽  
pp. 483-489 ◽  
Author(s):  
Yoji NAKAJIMA ◽  
Satoru FURUSAWA ◽  
Hua LIANG ◽  
Tatsuo TANAKA
Keyword(s):  
Spontaneous Ignition ◽  
Powder Bed ◽  
Self Heating

scholarly journals Vanadium oxide supported on porous clay heterostructure for the partial oxidation of hydrogen sulphide to sulfur

2015 ◽  
Vol 254 ◽  
pp. 36-42 ◽  
Author(s):  
M.D. Soriano ◽  
J.A. Cecilia ◽  
A. Natoli ◽  
J. Jiménez-Jiménez ◽  
J.M. López Nieto ◽  
...  
Keyword(s):  
Vanadium Oxide ◽  
Partial Oxidation ◽  
Hydrogen Sulphide ◽  
Oxidation Of Hydrogen ◽  
Porous Clay Heterostructure

Oxidation of hydrogen sulphide in sour gas by Chlorobium limicola

2007 ◽  
Vol 41 (6-7) ◽  
pp. 702-705 ◽  
Author(s):  
Andrew S. Ball ◽  
David B. Nedwell ◽  
Rupert G. Perkins
Keyword(s):  
Hydrogen Sulphide ◽  
Chlorobium Limicola ◽  
Oxidation Of Hydrogen ◽  
Sour Gas

scholarly journals Self-Heating of Biochar during Postproduction Storage by O2 Chemisorption at Low Temperatures

Energies ◽  
2022 ◽  
Vol 15 (1) ◽  
pp. 380
Author(s):  
Aekjuthon Phounglamcheik ◽  
Nils Johnson ◽  
Norbert Kienzl ◽  
Christoph Strasser ◽  
Kentaro Umeki
Keyword(s):  
Low Temperatures ◽  
Pilot Scale ◽  
Thermal Runaway ◽  
Spontaneous Ignition ◽  
Transient Model ◽  
Thermogravimetric Analyzer ◽  
Self Heating ◽  
O2 Adsorption ◽  
Insight Into ◽  
Good Agreement

Biochar is attracting attention as an alternative carbon/fuel source to coal in the process industry and energy sector. However, it is prone to self-heating and often leads to spontaneous ignition and thermal runaway during storage, resulting in production loss and health risks. This study investigates biochar self-heating upon its contact with O2 at low temperatures, i.e., 50–300 °C. First, kinetic parameters of O2 adsorption and CO2 release were measured in a thermogravimetric analyzer using biochar produced from a pilot-scale pyrolysis process. Then, specific heat capacity and heat of reactions were measured in a differential scanning calorimeter. Finally, a one-dimensional transient model was developed to simulate self-heating in containers and gain insight into the influences of major parameters. The model showed a good agreement with experimental measurement in a closed metal container. It was observed that char temperature slowly increased from the initial temperature due to heat released during O2 adsorption. Thermal runaway, i.e., self-ignition, was observed in some cases even at the initial biochar temperature of ca. 200 °C. However, if O2 is not permeable through the container materials, the temperature starts decreasing after the consumption of O2 in the container. The simulation model was also applied to examine important factors related to self-heating. The results suggested that self-heating can be somewhat mitigated by decreasing the void fraction, reducing storage volume, and lowering the initial char temperature. This study demonstrated a robust way to estimate the cooling demands required in the biochar production process.

Sign in / Sign up

Export Citation Format

Share Document