scholarly journals Ignition Temperature of Dust Layer and Dust Clouds of Wood Pellets

2013 ◽  
Vol 21 (Special-Issue) ◽  
pp. 122-126
Author(s):  
Jozef Horváth ◽  
Karol Balog
Keyword(s):  
Temperature Dependence ◽  
Combustion Chamber ◽  
Ignition Temperature ◽  
Fire Risk ◽  
Wood Waste ◽  
Wood Pellets ◽  
Dust Layer ◽  
Dust Clouds

Abstract In the production, transport, storage and use of wood pellets forming a flammable and explosive dust. To assess the fire risk of wood pellets was determined ignition temperature of dust layers and dust clouds. We used two commercially produced pellets from wood waste and wood and studied the dependence of ignition temperature on the thickness of dust layer and also observed the ignition temperature dependence of dust clouds from the weight and pressure of air in combustion chamber.

scholarly journals Experimental Study Of Minimum Ignition Temperature Of Spent Coffee Grounds

2015 ◽  
Vol 10 (2) ◽  
pp. 1-7
Author(s):  
Igor Wachter ◽  
Karol Balog ◽  
Hana Kobetičová ◽  
Aleš Ház
Keyword(s):  
Ignition Temperature ◽  
Dust Cloud ◽  
Scientific Paper ◽  
Spent Coffee Grounds ◽  
Hot Plate ◽  
Dust Layer ◽  
Dust Clouds ◽  
Coffee Grounds ◽  
High Layer ◽  
Minimum Ignition Temperature

Abstract The aim of this scientific paper is an analysis of the minimum ignition temperature of dust layer and the minimum ignition temperatures of dust clouds. It could be used to identify the threats in industrial production and civil engineering, on which a layer of combustible dust could occure. Research was performed on spent coffee grounds. Tests were performed according to EN 50281-2-1:2002 Methods for determining the minimum ignition temperatures of dust (Method A). Objective of method A is to determine the minimum temperature at which ignition or decomposition of dust occurs during thermal straining on a hot plate at a constant temperature. The highest minimum smouldering and carbonating temperature of spent coffee grounds for 5 mm high layer was determined at the interval from 280 °C to 310 °C during 600 seconds. Method B is used to determine the minimum ignition temperature of a dust cloud. Minimum ignition temperature of studied dust was determined to 470 °C (air pressure - 50 kPa, sample weight 0.3 g).

scholarly journals Minimum Ignition Temperature of Wood Dust Layers

2013 ◽  
Vol 21 (Special-Issue) ◽  
pp. 127-131
Author(s):  
Martin Pastier ◽  
Ivana Tureková ◽  
Zuzana Turňová ◽  
Jozef Harangozó
Keyword(s):  
Ignition Temperature ◽  
Standardized Test ◽  
Fire Risk ◽  
Test Methods ◽  
Technical Characteristic ◽  
Laboratory Method ◽  
Wood Dust ◽  
Explosion Hazard ◽  
Dust Layer ◽  
Minimum Ignition Temperature

Abstract Fire characteristic (properties) are used to determine the fire risk and explosion hazard of materials. They are defined as numerical values which describe behavior in the process of burning. They can be determinate by standardized test methods. In this paper is described the most important fire technical characteristic of dust layer (minimum ignition temperature) and the results of standard laboratory method determination for wood dusts, aswell.

scholarly journals A Study on the Ignition Temperature and Ignition Induction Time According to Storage Amount of Wood Pellets

2019 ◽  
Vol 33 (1) ◽  
pp. 7-14 ◽  
Author(s):  
Hyeong-Seok Kim ◽  
Yu-Jung Choi ◽  
Jung-Hun Kim ◽  
Phil-Hoon Jeong ◽  
Jae-Wook Choi
Keyword(s):  
Induction Time ◽  
Ignition Temperature ◽  
Wood Pellets

Materials for Safety and Security

2020 ◽  
pp. 288-320
Author(s):  
Jozef Martinka ◽  
Janka Dibdiakova
Keyword(s):  
Hydrogen Cyanide ◽  
Ignition Temperature ◽  
Fire Risk ◽  
Combustion Products ◽  
Security Engineering ◽  
Insulating Materials ◽  
Properties Of Materials ◽  
Materials Used ◽  
Carbon Monoxide Yield ◽  
The Impact

This chapter deals with materials used in safety and security engineering. The most commonly used materials in this field include shielding materials, materials for protective suits, electrically insulating materials and materials for fire protection. The first part of the chapter describes the properties of materials used in the above applications. The second part of the chapter focuses on characteristics of materials that accurately describe their fire risk. The fire risk of a material is quantified by its resistance to ignition (determined generally by critical heat flux and ignition temperature) and by the impact of the fire on the environment. The impact of fire is usually determined by the heat release rate, toxicity of combustion products (primarily determined by carbon monoxide yield and for materials that contain nitrogen, also through the hydrogen cyanide yield) and the decrease of visibility in the area (depending on the geometry of the area and the smoke production rate).

scholarly journals Variation of ignition sensitivity characteristics of non-stick coal dust explosions

2020 ◽  
Author(s):  
Di Sha ◽  
Yucheng Li ◽  
Xihua Zhou ◽  
Ruiqing Li
Keyword(s):  
Ignition Temperature ◽  
Coal Dust ◽  
Dust Cloud ◽  
Particle Sizes ◽  
Ignition Energy ◽  
Minimum Ignition Energy ◽  
Dust Layer ◽  
Independent Variables ◽  
Minimum Ignition Temperature ◽  
Dust Explosions

Abstract The ignition and explosion of coal dust are significant hazards in coal mines. In this study, the minimum ignition temperature and energy of non-stick coal dust were investigated empirically at different working conditions to identify the key factors that influence the sensitivity and characteristics of coal dust explosions. The results showed that for a given particle size, the minimum ignition temperature of the coal dust layer was inversely related to the thickness of the coal dust layer. Meanwhile, when the layer thickness was kept constant, the minimum ignition temperature of the coal dust layer decreased with smaller coal dust particle sizes. Over the range of particle sizes tested (25–75 μm), the minimum ignition temperature of the coal dust cloud gradually increased when larger particles was used. At the same particle size, the minimum ignition temperature of the coal dust layer was much lower than that of the coal dust cloud. Furthermore, the curves of minimum ignition energy all exhibited a minimum value in response to changes to single independent variables of mass concentration, ignition delay time and powder injection pressure. The interactions of these three independent variables were also examined, and the experimental results were fitted to establish a mathematical model of the minimum ignition energy of coal dust. Empirical verification demonstrated the accuracy and practicability of the model. The results of this research can provide an experimental and theoretical basis for preventing dust explosions in coal mines to enhance the safety of production.

scholarly journals Analysis of minimum ignition temperature of pellet dust layer and cloud due to adding BC and ABC fire extinguishing powders

2018 ◽  
Vol 247 ◽  
pp. 00003
Author(s):  
Bożena Kukfisz
Keyword(s):  
Outer Surface ◽  
Ignition Temperature ◽  
Test Results ◽  
Dust Layer ◽  
Fire Extinguishing ◽  
Minimum Ignition Temperature ◽  
The Impact

The paper describes the impact of adding fire extinguishing powders acting based on oxygen or flame on values of minimum ignition temperatures of the layer and cloud of pellet dust, and as a consequence the impact or lack of impact on values of maximum admissible temperature on external surfaces of electrical appliances working in their atmospheres. Tests were conducted of the minimum ignition temperature of layer and cloud of the agro armakow pellet dust and the agro jesień pellet dust, with and without additives of fire extinguishing powders BC Jet, BC LB2, ABC 90 and Ogniotex 103 at concentrations ranging from 5 to 70% by weight of powder contents in the mixture. Based on obtained test results it has been ascertained that type ABC powders appear to be much more effective than those type BC, because they have a much bigger impact on increasing the minimum ignition temperature of the layer and the cloud of analysed dust types. Adding only 15% of ABC 90 extinguishing powder to the agro jesień pellet has caused an increase in the minimum ignition temperature of dust layer by 80°C. The BC LB2 powder with agro armakow pellet dust has not been found to cause any changes, even at its concentration as high as 70%. The most optimum additive of powder to the biomass dust was 10% by weight of ABC powder in the mixture. At this concentration the highest increase was recorded in the maximum admissible temperature on the outer surface of electrical appliances from 235°C to 273°C.

Study on Fire Risk Assessment on Round Irradiation Room of Stacking under Stuck Radioactive Sources

2014 ◽  
Vol 919-921 ◽  
pp. 512-517
Author(s):  
Xiao Lin Yao
Keyword(s):  
Risk Assessment ◽  
Temperature Field ◽  
Temperature Variation ◽  
Ignition Temperature ◽  
Fire Risk ◽  
Radioactive Source ◽  
Research Subject ◽  
Fire Scenario ◽  
Minimum Ignition Temperature ◽  
Radioactive Sources

The typical 60Co round irradiation room of stacking has been taken as a research subject. Ignition temperatures of common radiation cargo were measured through the experiments, minimum ignition temperature is 210 °C. In order to discuss the temperature variation and temperature field under stuck radioactive sources, the fire scenario was presented and simulated by FDS. The results show that temperatures rise rapidly when stuck radioactive source broke out within an hour. As the growth of the time, temperatures in irradiation room are rising, but the rising rate is slowing. The temperature field in the irradiation room tends to be the same after two hours. The stuck radioactive source occurred after 7.2 days later, local temperatures can reach 210 °C, and radiation cargo may be ignited.

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