Coal dust/air explosions in a large-scale tube

Liu, Qingming; Chen, Bai; Li, Xiaodong; Li, Jiang; Dai, Wenxi

doi:10.1016/j.fuel.2009.07.010

Cited by 55 publications

(9 citation statements)

References 14 publications

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“…The MEC values for the raw and torrefied Poplar wood are 50~60 g/m 3 . This is in contrast with the MEC of coal dust reported by Liu et al (2010) in the range of 120 g/m 3 . This may be due to the higher volatile matter in the biomass compared with that in the coal.…”

Section: The Explosivity Of the Torrefied Biomasscontrasting

confidence: 83%

A Comprehensive Review on Biomass Torrefaction

Nhuchhen¹,

Basu²,

Acharya³

2014

IJREB

174

143

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Biomass is a versatile energy resource that could be used as a sustainable energy resource in solid, liquid and gaseous form of energy sources. Torrefaction is an emerging thermal biomass pretreatment method that has an ability to reduce the major limitations of biomass such as heterogeneity, lower bulk density, lower energy density, hygroscopic behavior, and fibrous nature. Torrefaction, aiming to produce high quality solid biomass products, is carried out at 200-300 °C in an inert environment at an atmospheric pressure. The removal of volatiles through different decomposition reactions is the basic principle behind the torrefaction process. Torrefaction upgrades biomass quality and alters the combustion behavior, which can be efficiently used in the co-firing power plant. This paper presents a comprehensive review on torrefaction of biomass and their characteristics. Despite of the number of advantages, torrefaction is motivated mainly for thermochemical conversion process because of its ability to increase hydrophobicity, grindability and energy density of biomass. In addition to this, torrefied biomass could be used to replace coal in the metallurgical process, and promoted as an alternative of charcoal.

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Section: The Explosivity Of the Torrefied Biomasscontrasting

confidence: 83%

A Comprehensive Review on Biomass Torrefaction

Nhuchhen¹,

Basu²,

Acharya³

2014

IJREB

174

143

View full text Add to dashboard Cite

show abstract

“…However, the L/D ratio and the initial ignition energy is higher. It must also be highlighted that the coal dust has been initially injected and premixed with the methaneair mixture before the ignition of the combustible solid and gas phases [6][7][8]. Fig.…”

Section: Results Of the Deposited Coal Dustmentioning

confidence: 99%

Laboratory Scaled Coal Dust Explosions and Physical Test Results for CFD Explosion Models

Maier

Hartlieb

Brune

2020

Berg Huettenmaenn Monatsh

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The work was carried out during an exchange program of several-months at the Colorado School of Mines (CSM) in Golden, Colorado. The goal of the thesis was to investigate scaled methane and coal dust explosions for the validation of CFD models. A series of different tests were performed in a horizontal, cylindrical steel reactor with a length of 1.5 m and a diameter of 63 mm at a scale of about 1:30. These tests are used to investigate the effect of coal dust on the combustion process by measuring the velocity of propagation. Furthermore, a reactor was constructed to visualize coal dust explosions, their interaction with the methane flame and the entrainment of coal dust particles. These approaches will help to understand the relationship between the particle dispersion and the turbulent flame propagation and to prepare experiments in a larger, 1:5 scaled steel reactor (L = 31 m, D = 0.71 m).

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“…The results show that addition of a small amount of dust, gas or solvent significantly reduced the lower explosive limit of the mixture and increased its explosibility. Liu et al (2010) studied coal dust-air mixture explosions under weak ignition conditions in a horizontal experimental tube. The researchers measured the maximum explosion overpressure, the propagation velocity of the pressure wave along the tube and the minimum concentration of coal dust required for an explosion.…”

Section: Introductionmentioning

confidence: 99%

Comparative study of the explosion pressure characteristics of micro- and nano-sized coal dust and methane–coal dust mixtures in a pipe

Tan

Liu

et al. 2020

Int J Coal Sci Technol

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Coal dust explosion accidents often cause substantial property damage and casualties and frequently involve nano-sized coal dust. In order to study the impact of nano-sized coal on coal dust and methane-coal dust explosions, a pipe test apparatus was used to analyze the explosion pressure characteristics of five types of micro-nano particle dusts (800 nm, 1200 nm, 45 lm, 60 lm, and 75 lm) at five concentrations (100 g/m 3 , 250 g/m 3 , 500 g/m 3 , 750 g/m 3 , and 1000 g/m 3 ). The explosion pressure characteristics were closely related to the coal dust particle size and concentration. The maximum explosion pressure, maximum rate of pressure rise, and deflagration index for nano-sized coal dust were larger than for its micro-sized counterpart, indicating that a nano-sized coal dust explosion is more dangerous. The highest deflagration index K st for coal dust was 13.97 MPa/(mÁs), indicating weak explosibility. When 7% methane was added to the air, the maximum deflagration index K st for methane-coal dust was 42.62 MPa/(mÁs), indicating very strong explosibility. This indicates that adding methane to the coal dust mixture substantially increased the hazard grade.

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Coal dust/air explosions in a large-scale tube

Cited by 55 publications

References 14 publications

A Comprehensive Review on Biomass Torrefaction

A Comprehensive Review on Biomass Torrefaction

Laboratory Scaled Coal Dust Explosions and Physical Test Results for CFD Explosion Models

Comparative study of the explosion pressure characteristics of micro- and nano-sized coal dust and methane–coal dust mixtures in a pipe

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