Evaluation of A TGA Method to Predict the Ignition Temperature and Spontaneous Combustion Propensity of Coals of Different Rank

2016 ◽  
Keyword(s):  
Ignition Temperature ◽  
Spontaneous Combustion

scholarly journals Influencing factors and mechanisms involved in the ignition of low-rank coal: Implications for spontaneous combustion

2021 ◽  
Vol 228 ◽  
pp. 01015
Author(s):  
Yueling Zhang ◽  
Shengyue Ma ◽  
Jing Xiao ◽  
Yajun Tian ◽  
Kechang Xie
Keyword(s):  
Ignition Temperature ◽  
Gas Flow ◽  
Spontaneous Combustion ◽  
Rapid Assessment ◽  
Active Species ◽  
Low Rank ◽  
Low Rank Coal ◽  
Test Conditions ◽  
Ignition Mechanism ◽  
Coal Properties

Understanding the ignition mechanism of spontaneous combustion is critical for preventing it. In this work, the effects of different test conditions including oxygen concentration, heating rate, oxidation carrier gas flow rate, and sample amount on the ignition temperature were studied with a thermal gravimetric analyzer. Further, the effects of coal properties on the ignition temperature were also investigated using 15 different low-rank coals. A heterogenous ignition model was proposed that small amount of active species is the key material leading to ignition. The heterogenous ignition mechanism well explained the complex effects of test conditions and coal properties on the ignition temperature of low-rank coal. Finally, an empirical formula for predicting the ignition temperature was derived for the rapid assessment of the spontaneous combustion potential.

Risk evaluation of coal spontaneous combustion on the basis of auto-ignition temperature

Fuel ◽  
2018 ◽  
Vol 233 ◽  
pp. 68-76 ◽  
Author(s):  
Yutao Zhang ◽  
Yurui Liu ◽  
Xueqiang Shi ◽  
Chaoping Yang ◽  
Weifeng Wang ◽  
...  
Keyword(s):  
Ignition Temperature ◽  
Risk Evaluation ◽  
Spontaneous Combustion ◽  
Coal Spontaneous Combustion ◽  
Auto Ignition

scholarly journals RESEARCH TEMPERATURES OF IGNITION AND SELF-IGNITION OF COTTON AND POLYESTER FABRICS

Fire Safety ◽  
2021 ◽  
Vol 38 ◽  
pp. 32-37
Author(s):  
V. Tovarianskyi ◽  
I. Adolf ◽  
V. Petrovskyi
Keyword(s):  
Cotton Fabric ◽  
Ignition Temperature ◽  
Spontaneous Combustion ◽  
Fire Hazard ◽  
Cotton Fabrics ◽  
Solid Sample ◽  
The Self ◽  
Fire Load ◽  
Rapid Spread ◽  
Garment Factories

Formulation of the problem. Most of the fabrics used in the technological processes of garment enterprises are classified as combustible materials and are part of the fire load, which threatens the outbreak and rapid spread of fires in the premises of garment factories. Therefore, it is important to study the indicators of the fire hazard of fabrics to identify the most dangerous of them, as well as to increase the efficiency of fire safety at sewing enterprises.The purpose of the work is to obtain the dependences of the values of ignition and self-ignition temperatures of cotton fabrics on the composition of cotton.Results. It was found that the crushed 100% cotton fabric flamed best, and the worst − solid polyester as a fabric without cotton. The lowest value of the temperature at which ignition was observed was 215°C for cotton (100%, shredded fabric), and if this value is reduced - there were failures, which are caused in particular by the fact that at lower temperatures flammable vapours are no formed in concentrations sufficient for combustion. It was found that the ignition / spontaneous combustion temperatures for a solid sample of the fabric with a composition of 100% cotton are 235°C/420°C, and for a solid sample of the fabric with a composition of 100% polyester − 360°C/500°C, respectively. Ignition / spontaneous com-bustion temperatures for finely divided fabrics are 8,5%/4,78% (cotton fabric) and 2.8%/6% (polyester) lower than the values obtained for whole fabrics.Results. According to the results of the analysis of the most common fabrics (table 1) used in garment enterprises. Identified that the biggest fire hazard is inherent containing cotton. The lowest ignition temperature is observed for cotton (100% shredded fabric) and is 215°C, which is 1,63 times less than the ignition temperature of polyester (0% cotton, shredded fabric). The lowest self-ignition temperature is also observed for cotton (100% shredded fabric) and is 400°C, which is 1,18 less than the self-ignition temperature of polyester (0% cotton, shredded fabric).

scholarly journals Self-ignition temperature of the dust accumulations for sunflower and wood powders

2022 ◽  
Vol 354 ◽  
pp. 00012
Author(s):  
Maria Prodan ◽  
Andrei Szollosi-Moța ◽  
Vasilica Irina Nălboc ◽  
Niculina Sonia Șuvar ◽  
Adrian Jurca
Keyword(s):  
Carbon Dioxide ◽  
Ignition Temperature ◽  
Organic Waste ◽  
Spontaneous Combustion ◽  
Atmospheric Oxygen ◽  
Construction Materials ◽  
Carbon Oxide ◽  
The Self ◽  
Construction Engineering ◽  
Air Passage

Spontaneous combustion is a phenomenon that results from the heating of combustible organic powders by slow oxidation and which occurs through the air passage (created by an air depression) through the mass of dust. The oxidation phenomenon of combustible powders represents their reaction with atmospheric oxygen resulting in products of carbon dioxide, carbon oxide, water and other gases whose content depends on the temperature at which the oxidation takes place. The self-ignition of combustible dusts depends on their chemical composition, the properties of component substances, on the particle size and geometry of the material mass and, last but not least, on the temperature of the environment. Due to global worries of sustainability in construction engineering the trend is to use ecofriendly organic waste to various purposes as in construction materials. The challenge is that by using this kind of materials one should ensure the safety related to the process of such organic materials which are known to have combustible properties. The purpose of this work is to present the self-ignition behavior of combustible dusts such as sunflower and wood by means of drying tests under constant temperature conditions.

Spontaneous Combustion

1877 ◽  
Vol 4 (81supp) ◽  
pp. 1285-1287
Author(s):  
Charles W. Vincent
Keyword(s):  
Spontaneous Combustion

Spontaneous combustion of hay

1963 ◽  
Vol 13 (7) ◽  
pp. 291-302
Author(s):  
H. P. Rothbaum
Keyword(s):  
Spontaneous Combustion

Assessment of Self-Heating Susceptibility of Indian Coal Seams – A Neural Network Approach

2014 ◽  
Vol 59 (4) ◽  
pp. 1061-1076 ◽  
Author(s):  
D.C. Panigrahi ◽  
S.K. Ray
Keyword(s):  
Neural Network ◽  
Spontaneous Combustion ◽  
Potential Method ◽  
Oxidation Potential ◽  
Wet Oxidation ◽  
Experimental Conditions ◽  
Neural Network Approach ◽  
Indian Coal ◽  
Petrographic Analyses ◽  
Artificial Neural Network Ann

Abstract The paper addresses an electro-chemical method called wet oxidation potential technique for determining the susceptibility of coal to spontaneous combustion. Altogether 78 coal samples collected from thirteen different mining companies spreading over most of the Indian Coalfields have been used for this experimental investigation and 936 experiments have been carried out by varying different experimental conditions to standardize this method for wider application. Thus for a particular sample 12 experiments of wet oxidation potential method were carried out. The results of wet oxidation potential (WOP) method have been correlated with the intrinsic properties of coal by carrying out proximate, ultimate and petrographic analyses of the coal samples. Correlation studies have been carried out with Design Expert 7.0.0 software. Further, artificial neural network (ANN) analysis was performed to ensure best combination of experimental conditions to be used for obtaining optimum results in this method. All the above mentioned analysis clearly spelt out that the experimental conditions should be 0.2 N KMnO4 solution with 1 N KOH at 45°C to achieve optimum results for finding out the susceptibility of coal to spontaneous combustion. The results have been validated with Crossing Point Temperature (CPT) data which is widely used in Indian mining scenario.

Influence of heating rate and degree of oxidation on the ignition temperature

2018 ◽  
Vol 4 ◽  
pp. 25-35
Author(s):  
D.V. Miroshnichenko ◽  
V.Yu. Kramarenko ◽  
I.V. Shulga ◽  
Yu.S. Kaftan ◽  
N.A Desna ◽  
...  
Keyword(s):  
Heating Rate ◽  
Ignition Temperature ◽  
Degree Of Oxidation
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