Search results for: Dehong Xia

Items from 1 to 20 out of 23 results

article

An efficient and continuous filter operation for dust‐laden flue gas based on a self‐cleaning stainless steel weaved filter

Hengyu Qu, Nien‐Chu Lai, Binfan Jiang, Xiangjun Liu, more

Environmental Progress & Sustainable Energy > 42 > 1 > n/a - n/a

Advanced filtration technologies of the high‐temperature flue gas are crucial for lower emission of dust particles and higher heat recovery. An efficient and continuous filter for high‐temperature flue gas based on a self‐cleaning stainless steel fabric is proposed in this article. Analysis of the microstructure of stainless steel fabric is conducted and derived the optimal structural parameters of...

article

Theoretical heat conduction equation based on micro particle vibration fundamental

Binfan Jiang, Dehong Xia, Fangfang Zhai, Rui Zhang, more

International Journal of Thermal Sciences > 2019 > 140 > C > 521-529

Heat conduction is a universal phenomenon in nature, and is usually described by Fourier's law. Whereas, the Fourier's law is an empirical equation concluded by experiments instead of theoretical derivation based on the physical nature. To bridge the gap between engineering and physics, studies are required to start from a more fundamental basis rather than on the macro scale (e.g., Fourier's law)...

article

A multicomponent kinetic model established for investigation on atmospheric new particle formation mechanism in H2SO4-HNO3-NH3-VOC system

Binfan Jiang, Dehong Xia, Xinru Zhang

Science of The Total Environment > 2018 > 616-617 > C > 1414-1422

Secondary new particle formation (NPF) plays a significant role in atmospheric particulate matters (e.g., PM2.5), and has been studied over the past decades. However, the mechanism of NPF still remains ambiguous, setting significant barrier for PM2.5 mitigations, especially in complex atmosphere with multi-pollutants. Since the NPF process can hardly be observed directly by experiment methods due...

article

Theoretical Analysis on the Removal of Cyclic Volatile Organic Compounds by Non-thermal Plasma

Binfan Jiang, Yu Wen, Zhiyong Li, Dehong Xia, more

Water, Air, & Soil Pollution > 2018 > 229 > 2 > 1-12

Volatile organic compounds (VOCs) from anthropogenic sources, especially cyclic organics with stable structure and strong toxicity (e.g., cyclohexane and benzene), exert hazards to atmospheric environment and human health, and need to be controlled urgently. As an emerging technology for VOC removal, non-thermal plasma (NTP) with low-energy consumption and high removal efficiency is widely studied...

article

Particle size prediction of magnesium nanoparticle produced by inert gas condensation method

Yu Wen, Dehong Xia

Journal of Nanoparticle Research > 2018 > 20 > 1 > 1-14

Properties of nanoparticles are normally depending on particle size; therefore, developing a model to predict particle size is of vital importance. This paper established an energy analysis model to predict average particle size of magnesium nanoparticles fabricated by inert gas condensation method. Predictions of average particle size ranging from 20 to 50 nm by energy analysis model have relative...

article

Role identification of NH3 in atmospheric secondary new particle formation in haze occurrence of China

Binfan Jiang, Dehong Xia

Atmospheric Environment > 2017 > 163 > C > 107-117

Haze pollution in China, dominated by the aerosol particulate matters smaller than 2.5 μm (PM2.5) has raised much concern over the past decade. PM2.5 is principally derived from secondary new particulate formation (NPF) with main precursors SO₂, NO₂, NH₃ and organic compounds (OC), where NH₃ is the only alkaline inorganic gas. However, due to the lack understanding of NH₃'s role in NPF, few attention...

article

Influence of silica and alumina (SiO2+Al2O3) on crystallization characteristics of synthetic coal slags

Weiwei Xuan, Qian Wang, Jiansheng Zhang, Dehong Xia

Fuel > 2017 > 189 > C > 39-45

Crystallization inside the liquid slag of entrained flow gasifiers can increase the viscosity of the slag, affecting flow down the wall and resulting in operational problems. The chemical component of the slag is an intrinsic factor of crystallization characteristics. In the study presented here, Differential Scanning Calorimetry (DSC) and the Single Hot Thermocouple Technique (SHTT) were combined...

article

Kinetic Simulations of Volatile Organic Compounds Decomposition by Non-thermal Plasma Treatment

Dehong Xia, Zhiyong Li, Yulei Xie, Xinru Zhang

Water, Air, & Soil Pollution > 2016 > 227 > 12 > 1-12

Volatile organic compounds (VOCs) decomposition by non-thermal plasma (NTP) has been receiving increasing attention from the scientific communities due to its advantages of easy operation, high efficiency, energy saving, and non-secondary pollution. But most of the researches are doing experiments and existing experiment methods cannot observe the micro physical and chemical processes. In order to...

article

Crystallization characteristics of a coal slag and influence of crystals on the sharp increase of viscosity

Weiwei Xuan, Jiansheng Zhang, Dehong Xia

Fuel > 2016 > 176 > C > 102-109

In entrained flow gasifiers, crystallization inside the liquid slag can cause an increase of the slag viscosity, affecting flow along the wall and resulting in operational challenges. In the study reported here, a real Chinese ash was investigated for its crystallization behavior as well as the viscosity. Differential Scanning Calorimetry (DSC) and the Single Hot Thermocouple Technique (SHTT) were...

article

Modeling and analysis of PM2.5 generation for key factors identification in China

Dehong Xia, Binfan Jiang, Yulei Xie

Atmospheric Environment > 2016 > 134 > C > 208-216

Recently, the PM_2.5 pollution in China has occurred frequently and caused widely concern. In order to identify the key factors for PM_2.5 generation, the formation characteristics of PM_2.5 would be revealed. A property of electric neutrality of PM_2.5 was proposed under the least-energy principle and verified through electricity-charge calculation in this paper. It indicated that PM_2.5 is formed by...

article

Influence of thermal process on particle size distribution of ultrafine magnesium powder prepared by inert gas condensation method

Yu Wen, Dehong Xia

Powder Technology > 2015 > 286 > C > 16-21

Ultrafine magnesium powder has become a research hotspot for the last few years because of its high-activity and low-density. Inert gas condensation method is a better method compared to mechanical pulverization method to produce magnesium ultrafine powder with high-purity, narrow particle size distribution and short production cycle. As particle size distribution is a vital factor when it comes to...

article

Research on Pyrolysis Mechanism of Huadian Oil Shale

Ling Ren, Dehong Xia, Yuanbo Xu, Meirong Guo, more

Energy Procedia > 2015 > 66 > Complete > 13-16

The extraction of shale oil similar to petroleum by pyrolysis of oil shale is of potential value. Based on the solid-phase thermolysis model, the double extrapolated method is applied to analyze the thermogravimetric data of Huadian oil shale. It is found that the essential procedure of Huadian oil shale pyrolysis accords with internal diffusion, which can be described by three-dimensional diffusion...

article

A sequential cycle of coal gas production with high heating value consisting of reduction and oxidation reactions

Dehong Xia, Hongbin Wu, Xiaoping Lei

Fuel > 2014 > 133 > Complete > 123-128

A sequential cycle of coal gas production with high heating value was developed consisting of reduction and oxidation reactions. Steam and air are used as gasification agents in the reduction zone while the reaction between char and air in the oxidation zone is exothermic and provides heat for the reduction zone. Coal ash and unburned char are circulated between the two zones and heated in the oxidation...

article

Mechanisms of thermal process of zinc ultrafine powder preparation by inert gas condensation

Dehong Xia, Yu Wen, Ling Ren, Xiao Hu

Powder Technology > 2014 > 257 > Complete > 175-180

Zinc ultrafine powder is widely used as key raw material for anti-corrosion paint in recent years. Inert gas condensation (IGC) is one of the primary means for preparing zinc ultrafine powder with a clean interface. As condensation is the most important process that determines the powder's size, this paper presents new models for radiative and convective cooling in condensation process by studying...

article

A binary array method for calculating thermal conductivity of porous materials

Dehong Xia, Liting Shen, Ling Ren, Shanshan Guo

Journal of Thermal Analysis and Calorimetry > 2014 > 117 > 2 > 825-829

The present research on thermal conductivity of porous materials is hampered by their highly random internal structure. Until now, the researches could not describe internal structure of porous materials, but macro calculation expressions were established. In order to solve the above problem, this paper presents a method of calculation that applies a binary array. This method can describe the internal...

article

Moisture diffusivity in structure of random fractal fiber bed

Fanglong Zhu, Yu Zhou, Qianqian Feng, Dehong Xia

Physics Letters A > 2013 > 377 > 37 > 2324-2328

A theoretical expression related to effective moisture diffusivity to random fiber bed is derived by using fractal theory and considering both parallel and perpendicular channels to diffusion flow direction. In this Letter, macroporous structure of hydrophobic nonwoven material is investigated, and Knudsen diffusion and surface diffusion are neglected. The effective moisture diffusivity predicted...

article

Study of the reconstruction of fractal structure of closed-cell aluminum foam and its thermal conductivity

Dehong Xia, Shanshan Guo, Ling Ren

Journal of Thermal Science > 2012 > 21 > 1 > 77-81

Based on the characteristics of the internal structure of closed-cell aluminum foam, this paper attempts to illustrate the process of reconstructing the internal structures of closed-cell aluminum foam in Monte-Carlo method and the fractal characteristics of the reconstructed model. Furthermore, Binary Array Method is proposed by analyzing the reconstructed model and the thermal conductivity model...

article

A comparative study on the separating methods of Al, Ca and Mg based on theoretical energy consumption

Dehong Xia, Yingchun Shang, Ling Ren

Journal of Thermal Science > 2011 > 20 > 1 > 82-87

Based on thermodynamics and physical chemistry theory, the theoretical energy consumption (TEC) of the typical separating processes of Al, Ca and Mg has been calculated and analyzed. This paper attempts to prove that the thermal method is more reasonable than the electrolytic methods to separate Al, Ca and Mg under the domestic circumstances of the low efficiency of coal-firing power plant at present.

article

Continuous method development and numerical study of HHV water gas production by pulverized coal

Ling Ren, Dehong Xia, Yan Zhang

Journal of Thermal Science > 2011 > 20 > 5 > 474-480

In energy industries, it is always of difficulty to produce high heat value(HHV) gas continuously using pulverized coal. In this paper, a new type furnace for partitioned alternative gasification using pulverized coal is developed, in which the oxidation and reduction reaction occur alternatively with the dropping of pulverized coal and finally HHV gas could be continuously obtained at the reduction...

article

Theoretical energy consumption analytical method for metal separation process

Dehong Xia, Yingchun Shang, Ling Ren, Yifan Li

Journal of Thermal Science > 2010 > 19 > 4 > 377-382

The theoretical energy consumption(TEC) analytical methods and the calculated models for the electrolytic and thermal reduction metal separation processes have been put forward based on thermodynamics and physical chemistry principles, providing theoretical foundation for choosing the optimum metal separation methods. Based on the models, the TECs of the Mg separation processes are taken as an example,...

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INFONA - science communication portal

Search results for: Dehong Xia

An efficient and continuous filter operation for dust‐laden flue gas based on a self‐cleaning stainless steel weaved filter

Theoretical heat conduction equation based on micro particle vibration fundamental

A multicomponent kinetic model established for investigation on atmospheric new particle formation mechanism in H2SO4-HNO3-NH3-VOC system

Theoretical Analysis on the Removal of Cyclic Volatile Organic Compounds by Non-thermal Plasma

Particle size prediction of magnesium nanoparticle produced by inert gas condensation method

Role identification of NH3 in atmospheric secondary new particle formation in haze occurrence of China

Influence of silica and alumina (SiO2+Al2O3) on crystallization characteristics of synthetic coal slags

Kinetic Simulations of Volatile Organic Compounds Decomposition by Non-thermal Plasma Treatment

Crystallization characteristics of a coal slag and influence of crystals on the sharp increase of viscosity

Modeling and analysis of PM2.5 generation for key factors identification in China

Influence of thermal process on particle size distribution of ultrafine magnesium powder prepared by inert gas condensation method

Research on Pyrolysis Mechanism of Huadian Oil Shale

A sequential cycle of coal gas production with high heating value consisting of reduction and oxidation reactions

Mechanisms of thermal process of zinc ultrafine powder preparation by inert gas condensation

A binary array method for calculating thermal conductivity of porous materials

Moisture diffusivity in structure of random fractal fiber bed

Study of the reconstruction of fractal structure of closed-cell aluminum foam and its thermal conductivity

A comparative study on the separating methods of Al, Ca and Mg based on theoretical energy consumption

Continuous method development and numerical study of HHV water gas production by pulverized coal

Theoretical energy consumption analytical method for metal separation process

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