LIVIVO - Search results -

Search results

Result 1 - 10 of total 14

Search options

Article: An alternative explosion criterion of combustible dusts based on combustion duration time: Applications for minimum explosion concentration and limiting oxygen concentration

Guo, Yongzheng / Ren, Kaiyue / Huang, Weixing / Wu, Dejian

Powder technology. 2022 Sept., v. 409

2022

Abstract: A novel method based on combustion duration time was newly proposed as an explosion criterion to determine minimum explosion concentration (MEC) and limiting oxygen concentration (LOC) in our recent works. This work further studies the reasonability and ... ...

Abstract	A novel method based on combustion duration time was newly proposed as an explosion criterion to determine minimum explosion concentration (MEC) and limiting oxygen concentration (LOC) in our recent works. This work further studies the reasonability and reliability of the alternative method experimentally and theoretically. Six different dust samples were tested via a 20-L spherical explosion chamber. The experimental results showed that the data of MEC and LOC determined by using the alternative and the standardized methods are in good agreement. The minimum flame propagation velocity (Sf) and the corresponding maximum combustion duration time (tc) were found at its MEC and LOC, suggesting that the theoretical analysis can well explain all the experimental data. It is the first time to study the theoretical basis of the explosion criterion, thus helping to improve our understandings of dust explosion characteristics, and to amend the explosion criterion in future test standards.
Keywords	combustion ; dust ; oxygen ; technology
Language	English
Dates of publication	2022-09
Publishing place	Elsevier B.V.
Document type	Article
ISSN	0032-5910
DOI	10.1016/j.powtec.2022.117851
Database	NAL-Catalogue (AGRICOLA)

Order via subito

This service is chargeable due to the Delivery terms set by subito. Orders including an article and supplementary material will be classified as separate orders. In these cases, fees will be demanded for each order.

Inter-library loan at ZB MED

Your chosen title can be delivered directly to ZB MED Cologne location if you are registered as a user at ZB MED Cologne.

Article: Inhibition effect of N2/CO2 blends on the minimum explosion concentration of agriculture and coal dusts

Wu, Wenying / Huang, Weixing / Wei, Aizhu / Schmidt, Martin / Krause, Ulrich / Wu, Dejian

Powder technology. 2022 Feb., v. 399

2022

Abstract: Minimum explosion concentration (MEC) of three agriculture dusts and two coal dusts was studied via a 20-L explosion chamber to reveal the role of gaseous inhibitors. Both active method (CO₂ diluting air) and passive method (CO₂ replacing O₂) were used. ... ...

Abstract	Minimum explosion concentration (MEC) of three agriculture dusts and two coal dusts was studied via a 20-L explosion chamber to reveal the role of gaseous inhibitors. Both active method (CO₂ diluting air) and passive method (CO₂ replacing O₂) were used. The TG and DTG thermal analysis tests were conducted to study the pyrolysis and combustion characteristics of dust samples. An alternative explosion criterion based on combustion duration time was used to determine MEC, and compared with the standardized overpressure method. Under 10-kJ ignition condition, as oxygen mole fraction (XO₂) decreased from 21% to 10%, MEC of agriculture dusts and coal dusts respectively increased by around 5 times and 2 times. The active inerting method with a lower N₂/CO₂ ratio was found to have a better suppression effect on the explosion of the five carbonaceous dusts because the blend has a higher specific heat and a lower oxygen diffusion rate.
Keywords	air ; carbon dioxide ; coal ; combustion ; dust ; oxygen ; pyrolysis ; specific heat ; technology
Language	English
Dates of publication	2022-02
Publishing place	Elsevier B.V.
Document type	Article
ISSN	0032-5910
DOI	10.1016/j.powtec.2022.117195
Database	NAL-Catalogue (AGRICOLA)

Order via subito

Inter-library loan at ZB MED

Your chosen title can be delivered directly to ZB MED Cologne location if you are registered as a user at ZB MED Cologne.

Article: Self-sustaining smoldering as a novel disposal approach for food waste with high moisture content

Song, Zeyang / He, Tiancheng / Li, Maorui / Wu, Dejian / You, Fei

Fuel processing technology. 2022 Apr., v. 228

2022

Abstract: This work aims to explore the self-sustaining smoldering treatment (SSST) for the destruction of food waste. The food waste used in this work mainly consists of cereal, vegetable, and meat. To examine the processing procedures and parameters, three ... ...

Abstract	This work aims to explore the self-sustaining smoldering treatment (SSST) for the destruction of food waste. The food waste used in this work mainly consists of cereal, vegetable, and meat. To examine the processing procedures and parameters, three experimental groups (raw food waste, food-waste paste and food-waste paste blended with anthracite) and five variables (moisture content, sand size, sand-to-food waste ratio, air flow and food waste-to-coal ratio) were extensively investigated. Results show that raw food waste with 40% moisture content can be disposed by SSST with the mass destruction ratio over 90%. However, the robustness of SSST for raw food waste is constrained by the heterogeneous issue due to a variety of components and sizes of food waste. This issue is addressed through stir pre-processing of raw food waste as food-waste paste. The robustness of SSST for food waste is significantly further enhanced only if a slight mass fraction of anthracite (<20% of raw food waste) is supplemented. This provides an alternative solution for employing SSST for raw food waste with very high moisture content.
Keywords	air flow ; food waste ; meat ; raw foods ; sand ; vegetables ; water content
Language	English
Dates of publication	2022-04
Publishing place	Elsevier B.V.
Document type	Article
ZDB-ID	1483666-x
ISSN	0378-3820
ISSN	0378-3820
DOI	10.1016/j.fuproc.2021.107144
Database	NAL-Catalogue (AGRICOLA)

Order via subito

Article ; Online: Experimental study and mechanism model on the ignition sensitivity of typical organic dust clouds in O2/N2, O2/Ar and O2/CO2 atmospheres

Wang, Dan / Ji, Tingchao / Jing, Qi / He, Wei / Fan, Zeyuan / Wu, Dejian / Qian, Xinming

Journal of hazardous materials. 2021 June 15, v. 412 p.125108-

2021

Abstract: To reveal and improve our understanding of the ignition behavior and mechanism, G-G furnace experiments of three typical organic dusts were performed to investigate the minimum ignition temperature (MIT) in O₂/N₂, O₂/Ar and O₂/CO₂ atmospheres with oxygen ...

Abstract	To reveal and improve our understanding of the ignition behavior and mechanism, G-G furnace experiments of three typical organic dusts were performed to investigate the minimum ignition temperature (MIT) in O₂/N₂, O₂/Ar and O₂/CO₂ atmospheres with oxygen mole fraction from 8.4% to 50%. The experimental results were presented in oxygen-lean and oxy-fuel atmospheres to evaluate the ignition sensitivity of dusts in different atmospheres. It was found that CO₂ is the strongest in terms of lowing the ignition sensitivity of the three dusts, and the dust explosion risk increases significantly with increasing O₂ mole fraction for the three dusts through a logarithmically and significantly reducing MIT. However, for different dusts, inert gases show different suppression effects. In addition, a modified steady-state homogeneous ignition model was proposed and successfully applied to oxygen-lean atmospheres, and in oxy-fuel atmospheres, this model has also been improved to estimate the ignition mechanism. This ignition mechanism model could be used to successfully predict the minimum ignition temperature of high volatile dust under different inert atmospheres controlled by homogeneous ignition, which will provide a reference for the ignition hazard assessment of dust on hot surfaces.
Keywords	carbon dioxide ; dust ; furnaces ; hazard characterization ; models ; oxygen ; risk ; temperature ; Minimum ignition temperature ; Ignition behavior ; O2/N2, O2/Ar and O2/CO2 atmospheres ; Ignition mechanism
Language	English
Dates of publication	2021-0615
Publishing place	Elsevier B.V.
Document type	Article ; Online
ZDB-ID	1491302-1
ISSN	1873-3336 ; 0304-3894
ISSN (online)	1873-3336
ISSN	0304-3894
DOI	10.1016/j.jhazmat.2021.125108
Database	NAL-Catalogue (AGRICOLA)

Order via subito

Article: Heat and electric flux coupling of closed-loop thermoelectric generator

Wu, Zhanglin / Guo, Xuming / Xie, Guo / Yan, Tiantong / Wu, Dejian / Zhang, Fujie / Ang, Ran

Energy conversion and management. 2021 Sept. 15, v. 244

2021

Abstract: Thermoelectric generator (TEG) has been proved as a promising technology for directly converting heat into electricity based on Seebeck effect. On the contrary, this electricity can trigger a solid-state cooling based on conventional Peltier effect. ... ...

Abstract	Thermoelectric generator (TEG) has been proved as a promising technology for directly converting heat into electricity based on Seebeck effect. On the contrary, this electricity can trigger a solid-state cooling based on conventional Peltier effect. However, these two effects induce a coupling between heat and electric flux, especially for the quantitative relationship still remaining a mystery. Here, we show experimental evidence and theoretical calculation for the coupling by monitoring transient response of fluid temperature and output power. The experimental maximum heat flow in open circuit is 1162 W at cold fluid flow rate V̇c = 0.3 m³/h and fluid temperature difference ΔTf = 70 °C, enhanced by 13% owing to heat compensation from intrinsic coupling in closed-loop circuit. Meanwhile, the measured maximum output power of TEG is 18.2 W, and subsequently decreases to 15.4 W due to the objective existence of coupling. This double-edged sword in coupling vigorously inspires the potential applications in heat-dissipation situation such as spacecraft, electronic components, photovoltaic, refrigerator and etc. Present findings open a novel avenue for manipulating heat-electricity conversion in practical engineering.
Keywords	administrative management ; cold ; cooling ; electricity ; energy conversion ; heat flow ; refrigerators ; spacecraft ; temperature ; thermoelectric generators
Language	English
Dates of publication	2021-0915
Publishing place	Elsevier Ltd
Document type	Article
ZDB-ID	2000891-0
ISSN	0196-8904
ISSN	0196-8904
DOI	10.1016/j.enconman.2021.114529
Database	NAL-Catalogue (AGRICOLA)

Order via subito

Article: Ignition temperature and mechanism of carbonaceous dust clouds: The roles of volatile matter, CH4 addition, O2 mole fraction and diluent gas

Wu, Dejian / Tan, Xin / Wei, Aizhu / Duan, Qiangling / Huang, Weixing / Schmidt, Martin

Journal of hazardous materials. 2021 Mar. 05, v. 405

2021

Abstract: Minimum ignition temperature of dust clouds (MITC) was studied experimentally and theoretically in different atmospheres. Three carbonaceous dusts were tested in both air and O₂/CO₂ atmospheres with CH₄ mole fraction from 0% to 2%. Results showed that ... ...

Abstract	Minimum ignition temperature of dust clouds (MITC) was studied experimentally and theoretically in different atmospheres. Three carbonaceous dusts were tested in both air and O₂/CO₂ atmospheres with CH₄ mole fraction from 0% to 2%. Results showed that the ignition risk of the three dusts significantly increases (decrease of MITC by ~100 ℃) with increasing XO₂ from 21% to 50%, but significantly decreases replacing N₂ in air with CO₂. The inhibition effect of CO₂ on MITCs could be diminished by increasing XO₂ or adding CH₄. The addition of small amount of CH₄ has different effects on the MITCs of different dust samples, following the opposite order of volatile matter content: anthracite>bituminous coal>starch. Two modified steady-state ignition models, considering the density of mixture gas and dust cloud, XO₂ and its diffusivity, were developed to interpret the experimental observations. The analysis revealed that the global heterogeneous ignition model suits well for the hybrid mixtures of anthracite or bituminous coal dusts. In contrast, the proposed global homogeneous ignition model was found to be only valid for the pure starch dust, and the extra CH₄ addition could strongly affect the ignition process of starch, particularly in O₂/CO₂ atmospheres with higher XO₂.
Keywords	air ; carbon dioxide ; coal ; diffusivity ; dust ; hybrids ; models ; risk ; starch ; temperature
Language	English
Dates of publication	2021-0305
Publishing place	Elsevier B.V.
Document type	Article
Note	NAL-AP-2-clean
ZDB-ID	1491302-1
ISSN	1873-3336 ; 0304-3894
ISSN (online)	1873-3336
ISSN	0304-3894
DOI	10.1016/j.jhazmat.2020.124189
Database	NAL-Catalogue (AGRICOLA)

Order via subito

Article ; Online: Experimental study and mechanism model on the ignition sensitivity of typical organic dust clouds in O

Wang, Dan / Ji, Tingchao / Jing, Qi / He, Wei / Fan, Zeyuan / Wu, Dejian / Qian, Xinming

Journal of hazardous materials

2021 Volume 412, Page(s) 125108

Abstract	To reveal and improve our understanding of the ignition behavior and mechanism, G-G furnace experiments of three typical organic dusts were performed to investigate the minimum ignition temperature (MIT) in O
Language	English
Publishing date	2021-01-14
Publishing country	Netherlands
Document type	Journal Article
ZDB-ID	1491302-1
ISSN	1873-3336 ; 0304-3894
ISSN (online)	1873-3336
ISSN	0304-3894
DOI	10.1016/j.jhazmat.2021.125108
Database	MEDical Literature Analysis and Retrieval System OnLINE

Order via subito

Article ; Online: Theoretical and numerical study on ignition behaviour of coal dust layers on a hot surface with corrected kinetic parameters.

Wu, Dejian / Song, Zeyang / Schmidt, Martin / Zhang, Qi / Qian, Xinming

Journal of hazardous materials

2019 Volume 368, Page(s) 156–162

Abstract: Industrial fires and explosions initiating from self-ignition of combustible porous dust deposits represent a serious hazard for human beings, environment and industry. Understanding the fundamental basis of combustible dust ignition behaviours at ... ...

Abstract	Industrial fires and explosions initiating from self-ignition of combustible porous dust deposits represent a serious hazard for human beings, environment and industry. Understanding the fundamental basis of combustible dust ignition behaviours at different geometries is of importance to prevent and mitigate the accidental risks. A correlation of self-ignition temperatures (SITs) measured by hot-oven tests and minimum ignition temperatures of dust layers (MITLs) determined by hot-plate tests has been established previously. However, this analogy approach based on Frank-Kamenetzkii model is limited by ignoring the influence of oxygen diffusion. In this work, an improved method is developed by implementing a correction factor for the pre-exponential factor caused by the boundary geometry. This method is testified by comparing with experimental data, previous analogy method and numerical simulation. Results show that our proposed method performs a better predictability of MITLs and simplicity. The improved analogy method indicates that the different boundary geometries of a dust deposit significantly impact the apparent pre-exponential factor, while have an ignorable influence on the activation energy, which is also verified by numerical investigations. Furthermore, the numerical model with the corrected kinetic parameters provides a satisfactory explanation compared with experimental observations regarding to temperature and concentration evolutions of dust layers.
Language	English
Publishing date	2019-01-14
Publishing country	Netherlands
Document type	Journal Article
ZDB-ID	1491302-1
ISSN	1873-3336 ; 0304-3894
ISSN (online)	1873-3336
ISSN	0304-3894
DOI	10.1016/j.jhazmat.2019.01.032
Database	MEDical Literature Analysis and Retrieval System OnLINE

Order via subito

Article ; Online: Ignition temperature and mechanism of carbonaceous dust clouds: The roles of volatile matter, CH

Wu, Dejian / Tan, Xin / Wei, Aizhu / Duan, Qiangling / Huang, Weixing / Schmidt, Martin

Journal of hazardous materials

2020 Volume 405, Page(s) 124189

Abstract: Minimum ignition temperature of dust clouds (MITC) was studied experimentally and theoretically in different atmospheres. Three carbonaceous dusts were tested in both air and ... ...

Abstract	Minimum ignition temperature of dust clouds (MITC) was studied experimentally and theoretically in different atmospheres. Three carbonaceous dusts were tested in both air and O
Language	English
Publishing date	2020-10-10
Publishing country	Netherlands
Document type	Journal Article
ZDB-ID	1491302-1
ISSN	1873-3336 ; 0304-3894
ISSN (online)	1873-3336
ISSN	0304-3894
DOI	10.1016/j.jhazmat.2020.124189
Database	MEDical Literature Analysis and Retrieval System OnLINE

Order via subito

Article: Numerical study on hydrodynamics and explosion hazards of corn starch at high-temperature environments

Wang, Dan / Huang, Ping / Ji, Tingchao / Qian, Xinming / Wu, Dejian / Zhang, Qi

Powder technology. 2019 Nov. 02,

2019

Abstract: Dust explosions have been often reported in many industries that handle or process combustible dusts, with great losses to life and property. This explosion risk could be amplified under some extreme conditions like high-temperature environments. In this ...

Abstract	Dust explosions have been often reported in many industries that handle or process combustible dusts, with great losses to life and property. This explosion risk could be amplified under some extreme conditions like high-temperature environments. In this work, we develop a 2D numerical method to investigate explosion characteristics of corn starch cloud with an emphasis on the roles of high-temperature environments. The particle tracking trajectories and devolatilization evolution at high-temperature environments are described. The dust explosion severity characteristics including maximum explosion pressure (Pex) and maximum rate of pressure rise (dp/dt)max, are also investigated. In addition, the characterized devolatilization and explosion time are applied to analyze dust explosion behavior and flame propagation. The devolatilization evolution of dust cloud and flame propagation modes are found to vary with ambient temperature. And three ignition modes are observed after ignition. The simulation also provides a satisfactory prediction for dust explosion behavior at high-temperature environments.
Keywords	ambient temperature ; corn ; corn starch ; dust ; explosions ; explosive hazards ; hydrodynamics ; industry ; powders ; prediction ; risk ; starch
Language	English
Dates of publication	2019-1102
Publishing place	Elsevier B.V.
Document type	Article
Note	Pre-press version
ISSN	0032-5910
DOI	10.1016/j.powtec.2019.11.001
Database	NAL-Catalogue (AGRICOLA)

Order via subito

Inter-library loan at ZB MED

Your chosen title can be delivered directly to ZB MED Cologne location if you are registered as a user at ZB MED Cologne.

To top

More links

Kategorien

Order via subito

Inter-library loan at ZB MED

More links

Kategorien

Order via subito

Inter-library loan at ZB MED

More links

Kategorien

Order via subito

More links

Kategorien

Order via subito

More links

Kategorien

Order via subito

More links

Kategorien

Order via subito

More links

Kategorien

Order via subito

More links

Kategorien

Order via subito

More links

Kategorien

Order via subito

More links

Kategorien

Order via subito

Inter-library loan at ZB MED