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  • Theoretical analysis of reaction regimes in low ...

    Cited by: 106
  • Micro-characteristics of low-temperature coal

    Cited by: 7
  • Catalysis of nickel in low temperature gasification of ...

    Catalysis of the low temperature gasification of brown coal by nickel was investigated by means of thermogravimetry and temperature-programmed X-ray diffraction analysis. Nickel catalyst exhibited an extremely high activity in the gasification both in steam and in hydrogen at low temperatures (773–873 K).

  • Pathways for Production of CO2 and CO in Low

    2019-5-25  Oxidation of a bituminous coal has been studied using an isothermal flow reactor operated at temperatures between 60 and 90 °C, and packed with coal particles smaller than 853 μm in diameter. The time-dependent rates of production of CO2 and CO during experiments were obtained simultaneously from the measurement of CO2 and CO concentration at the reactor's exit, just after the

  • Effects of oxygen supply on low-temperature

    1. Introduction. Coal self-heating leading to self-ignition incidents continues to be a serious problem in collieries, especially in underground longwall gobs (a semi-enclosed space) and stockpiles, as well as in coal related industries , , , , , , .Low-temperature oxidation of coal, a reaction between coal and oxygen at a low temperature (i.e. <200 °C), is the fundamental process for self ...

  • Study on the change of organic sulfur forms in coal

    The XPS analysis of raw coal samples before and after the low-temperature oxidation is presented in Fig. 1.It can be seen from Fig. 1 that 6 S 2p peaks can be fitted from the XPS spectra of sulfur in the 6 raw coal samples. Among these peaks, Peak 0 has binding energy of 163.1 eV which belongs to sulfide sulfur

  • Coal oxidation at low temperatures: oxygen

    Coal oxidation at low temperatures is a complicated process, involving four phenomena: oxygen transport to the surfaces of coal particles (convective mass transfer from the bulk to the film surrounding a particle followed by the diffusive mass transfer in the film) and within coal pores (pore diffusion), chemical interaction between coal and O 2, and release of heat and emission of gaseous ...

  • Ignition and Kinetics Analysis of Coal Combustion in Low ...

    2013-2-1  Coal Combustion in Low Oxygen Concentration 813 coal combustion. This value indicates the inception of the coal combustion. The peak temperatures .Tmax/ are the corresponding temperature to the maximum of the mass loss rate. Tmax is the characteristic of the combustion of the coal. Tb is the extrapolated offset temperature of the DTG curves.

  • Oxygen consumption of coal at low temperatures_百度文库

    2012-10-8  Coal samples For the study of oxygen consumption at low temperatures, different ranks of coal were collected which included lignite, jet coal, non-caking coal, gas coal, gas rich coal, 1/3 coking coal, coking coal, lean coal, anthracite, etc.

  • Coal oxidation at low temperatures_图文_百度文库

    2013-4-12  Rate studies of aerial oxidation of coal at low temperatures (30–170 8C). Fuel 1970;49:324–31. [129] Jones JC. Evidence from micorcalorimetry for irreversible chemisorption of oxygen in a low-rank coal. Fuel 1997;76: 1169–72. [130] Chakravarty SL. Auto Part I ...

  • Multiple linear equation of pore structure and coal-oxygen ...

    2015-10-26  Coal samples were oxidized in air ambient under different temperatures. Scanning Electron Microscope was used to indicate the surface morphology changes of oxidization. Then, based on fractal theory and flow characteristics, the fractal dimension of gas diffusion in the pore ways was calculated under different temperature.

  • Procedure of Reaction Between Coal and Oxygen at Low ...

    Based on surface molecular structures of coal, seven active surface groups of oxidation, which are main part to react with oxygen at relatively low temperature, are deduced. The reaction between O2 and coal includes chemical s orption and a 3step chemical ...

  • Iron-catalyzed gasification of brown coal at low

    2019-5-26  Energy Fuels All Publications/Website. OR SEARCH CITATIONS

  • Thermal analysis of Vitamin C affecting low

    Simultaneous thermal analysis was used to study the influence of Vitamin C as possible chemical additive inhibiting coal oxidation process at low temperature. Some oxidation characteristics of Vitamin C affecting the coal oxidation were investigated at different heating rates. The TG-DSC data show that the impact of Vitamin C on coal oxidation process can be directly evaluated using ignition ...

  • Experimental Study on Mechanical Properties of Coal Rock ...

    Cite this article: ZHANG Xinhai,ZHANG Kang,DING Feng等. Experimental Study on Mechanical Properties of Coal Rock Mass at Low Temperature[J]. Safety in Coal Mines, 2016, 47(1): 41-43. URL:

  • Coal oxidation at low temperatures: oxygen

    Coal oxidation at low temperatures is a complicated process, involving four phenomena: oxygen transport to the surfaces of coal particles (convective mass transfer from the bulk to the film surrounding a particle followed by the diffusive mass transfer in the film) and within coal pores (pore diffusion), chemical interaction between coal and O 2, and release of heat and emission of gaseous ...

  • Coal utilization - Carbonization (coke making)

    Low-temperature carbonization was once practiced widely to produce a coke suitable for residential heating, but residential furnaces are now fired almost exclusively by oil and natural gas. High-temperature carbonization reactions. In high-temperature carbonization, coal is heated to temperatures of 900–1,200 °C (1,600–2,200 °F).

  • Pore structure and compressibility of coal matrix with ...

    2017-5-9  reservoir properties, the pore structure and compressibility of coal matrix for low rank coal (0.69% R o, m) with elevated temperatures were investigated by using multiple methods, including thermogravimetry-mass spectrometry (TG-MS), scanning electron microscope (SEM), N 2 adsorption/desorption at 77 K and mercury intrusion porosimetry (MIP).

  • Analysis on the Governing Reactions in Coal Oxidation at ...

    2014-6-13  Wang [6] proposed four stages of the coal oxidation at low and moderate temperatures, i.e., moisture vaporiza - tion, mass increase by absorbing oxygen, degradation caused by heating, and combustion. The rate of mass in- crease at the second stage was defined and then utilized to evaluate the propensity of various coals towards spon-

  • Ignition and Kinetics Analysis of Coal Combustion in Low ...

    2013-2-1  Coal Combustion in Low Oxygen Concentration 813 coal combustion. This value indicates the inception of the coal combustion. The peak temperatures .Tmax/ are the corresponding temperature to the maximum of the mass loss rate. Tmax is the characteristic of the combustion of the coal. Tb is the extrapolated offset temperature of the DTG curves.

  • Coal oxidation at low temperatures: oxygen

    2020-5-25  Coal oxidation at low temperatures (i.e. <100 °C) is the major heat source responsible for the self-heating and spontaneous combustion of coal and is an important source of greenhouse gas emissions. This review focuses on the chemical reactions occurring during low-temperature oxidation of coal. Current understanding indicates that this process involves consumption of O 2, formation of solid ...

  • The Dynamic Change of Pore Structure for the Low

    The pore characteristics of the low-rank coal are different from medium- and high-rank coals. The low-temperature N 2 adsorption (LP-N 2 A) measurements with a single low-rank coal were launched, and the dynamic change of pore structures under various pretreatment temperatures from 120°C to

  • Coal utilization - Carbonization (coke making)

    Low-temperature carbonization was once practiced widely to produce a coke suitable for residential heating, but residential furnaces are now fired almost exclusively by oil and natural gas. High-temperature carbonization reactions. In high-temperature carbonization, coal is heated to temperatures of 900–1,200 °C (1,600–2,200 °F).

  • Pore structure and compressibility of coal matrix with ...

    2017-5-9  reservoir properties, the pore structure and compressibility of coal matrix for low rank coal (0.69% R o, m) with elevated temperatures were investigated by using multiple methods, including thermogravimetry-mass spectrometry (TG-MS), scanning electron microscope (SEM), N 2 adsorption/desorption at 77 K and mercury intrusion porosimetry (MIP).

  • Analysis on the Governing Reactions in Coal Oxidation at ...

    2014-6-13  Wang [6] proposed four stages of the coal oxidation at low and moderate temperatures, i.e., moisture vaporiza - tion, mass increase by absorbing oxygen, degradation caused by heating, and combustion. The rate of mass in- crease at the second stage was defined and then utilized to evaluate the propensity of various coals towards spon-

  • Effects of temperature gradient and particle size on

    This study investigates the effects of temperature gradient and coal particle size on the critical self-ignition temperature T CSIT of a coal pile packed with low-rank coal using the wire-mesh basket test to estimate T CSIT based on the Frank–Kamenetskii equation. The values of T CSIT, the temperature gradient and the apparent activation energy of different coal pile volumes packed with coal ...

  • Low Temperature Oxidation and Spontaneous

    The isothermal oxidation characteristics were estimated by considering the formation rates of CO and CO 2 at low temperatures. The upgraded low rank coal had higher heating values than the raw coal. It also had less susceptibility to low temperature oxidation and spontaneous combustion.

  • CO and CO2 emissions from spontaneous heating of coal ...

    2012-8-30  spontaneous combustion of coal and their impact on the environment (Carras et al., 2009; Pone et al., 2007). However, the chemical reaction between coal and O. 2 at low temperatures is complex and still not well understood. Generally, three types of processes are believed to occur (Carras and Young, 1994): (i) physical adsorption of O 2; (ii ...

  • Measurement of Critical Self-Ignition Temperatures of

    2018-4-18  2014 Coal Operators’ Conference The University of Wollongong 12 –14 February 2014 339 MEASUREMENT OF CRITICAL SELF-IGNITION TEMPERATURES OF LOW RANK COAL PILES Yongjun Wang1, Kyuro Sasaki2, Yuichi Sugai2, Xiaoming Zhang3 ABSTRACT: Considerable research exists on self-heating or spontaneous combustion of coal stockpiles from various aspects. The

  • The Dynamic Change of Pore Structure for the Low-Rank ...

    2020-7-1  A) measurements with a single low-rank coal were launched, and the dynamic change of pore structures under various pretreatment temperatures from 120°C to 300°C was studied. The isothermal curves of the DFS coal sample feature IV type, the hysteresis loops convert from H 4 type to H

  • The Dynamic Change of Pore Structure for the Low

    The pore characteristics of the low-rank coal are different from medium- and high-rank coals. The low-temperature N 2 adsorption (LP-N 2 A) measurements with a single low-rank coal were launched, and the dynamic change of pore structures under various pretreatment temperatures from 120°C to

  • Coal oxidation at low temperatures: oxygen

    2020-5-25  Coal oxidation at low temperatures (i.e. <100 °C) is the major heat source responsible for the self-heating and spontaneous combustion of coal and is an important source of greenhouse gas emissions. This review focuses on the chemical reactions occurring during low-temperature oxidation of coal. Current understanding indicates that this process involves consumption of O 2, formation of solid ...

  • Coal Tar - Low Temperature Coal Tar Manufacturer

    Manufacturer of Coal Tar - Low Temperature Coal Tar, Dehydrated Coal Tar offered by Shree Ram Traders, Morbi, Gujarat.

  • Effects of FeS2 on the process of coal spontaneous ...

    2020-6-11  X-MOL提供的期刊论文更新,Process Safety and Environmental Protection——Effects of FeS2 on the process of coal spontaneous combustion at low temperatures,Cai-Ping Wang; Zu-Jin Bai; Yang Xiao; Jun Deng; Chi-Min Shu

  • Low Temperature Oxidation and Spontaneous

    The isothermal oxidation characteristics were estimated by considering the formation rates of CO and CO 2 at low temperatures. The upgraded low rank coal had higher heating values than the raw coal. It also had less susceptibility to low temperature oxidation and spontaneous combustion.

  • Measurement of Critical Self-Ignition Temperatures of

    2018-4-18  2014 Coal Operators’ Conference The University of Wollongong 12 –14 February 2014 339 MEASUREMENT OF CRITICAL SELF-IGNITION TEMPERATURES OF LOW RANK COAL PILES Yongjun Wang1, Kyuro Sasaki2, Yuichi Sugai2, Xiaoming Zhang3 ABSTRACT: Considerable research exists on self-heating or spontaneous combustion of coal stockpiles from various aspects. The

  • COAL GASIFICATION/REFORMING USING LOW

    2009-4-23  technology, low-temperature Plasma Assisted Reforming (PAR), for production of hydrogen, syngas for Fisher-Tropsch synthesis, and fuel-gas for gas turbines from coal. In the PAR process, micronized coal is converted to product gas at temperatures of 600°C to 800°C.

  • The Evolution of Thermal Conductivity and Pore

    An experimental system for liquid nitrogen soaking and real-time temperature measurement was designed and implemented to investigate the characteristics of temperature field changes in coal under liquid nitrogen soaking. Then, the heat conduction law of the coal in the process of liquid nitrogen soaking and room temperature recovery for dry and water-saturated coal were examined.

  • The Dynamic Change of Pore Structure for the Low-Rank ...

    2020-7-1  A) measurements with a single low-rank coal were launched, and the dynamic change of pore structures under various pretreatment temperatures from 120°C to 300°C was studied. The isothermal curves of the DFS coal sample feature IV type, the hysteresis loops convert from H 4 type to H

  • Storage of Coal: Problems and Precautions

    2017-1-17  Keywords: Low Temperature Oxidation, Oxidation of Coal, Self Heating of Coal, Spontaneous Combustion, Coal Storage, Stacking, Blending. Contents 1. Introduction 2. Methods of Coal Stacking 2.1 Windrow Method 2.2 Chevron Method 2.3 Cone Shell Type Method 3. Problems Faced in Coal Stacks 4. Low Temperature Oxidation of Coal and Spontaneous ...