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  • Numerical simulation investigations into the influence of

     · In this paper 900 °C was selected as the ignition temperature of the fuel-rich coal/air flow with high pulverized-coal concentration so as to quantitatively compare the influence of RPR on the temperature rise and ignition of the fuel-rich coal/air flow). The difference between the two ignition positions of the fuel-rich flows is less than 1 m.

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  • Numerical simulation of the influence of fuel temperature

    The effects of fuel temperature and injection parameter on biodiesel spray were studied. Transient flow characteristics inside nozzle are coupled to the spray calculation. A sensitivity analysis of t

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  • The Influence Of Calcite On The Ash Flow Temperature For

    The Influence Of Calcite On The Ash Flow Temperature For Semi-Anthracite Coal From Donbas District

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  • Effects of pre-oxidation temperature on coal secondary

     · Spontaneous combustion of oxidized coal occurs frequently in mining and utilization process which is influenced by the first oxidation conditions significantly. With a focus on the influence of pre-oxidation temperature on spontaneous combustibility of oxidized coal oxidized coal samples were prepared by heating at preset temperature of 50 °C 70 °C 90 °C 110 °C and 130 °C. Programmed

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  • Experimental study on the influence of coal powders on

     · To explore the influence of drilling fluid mixed with coal powders on the wettability of the samples the contact angle of water base fluid and drilling fluid with 3 wt. powder mixed with corresponding substances on the surface of the lignite anthracite and shale were evaluated.

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  • Experimental study on the influence mechanism of gas

     · Highlights The influence mechanism of gas seepage on coal and gas outburst disasters has been studied. Gas seepage is an essential factor for coal and gas outburst disasters. Gas seepage decreases the strength of coal containing gas and accelerates its failure process. The more difficult the gas flows the more powerful the outburst will be. Gas compression energy is the main dynamic

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  • The Impact of Key Factors on Flow Characteristics of 14 MW

     · Reverse-swirl (RS) burner which has been industrialized couples reverses jet and swirl flow for the stabilization of flame. Using Dantec multichannel constant-temperature anemometer experiments on airflow characteristics were implemented on a 1 2 scaled burner model with different values in terms of reverse primary air (RPA) ratio and swirl inner secondary air (SISA) ratio. It was found that

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  • The Influence Of Calcite On The Ash Flow Temperature For

    Obtained outputs prove that A type coal has a lower value of sphere temperature than B type coal in the whole scope of percentage representation of the additive. The flow temperature dropped in total from 1489°C to 1280°C i.e. by 14 during the test of coal of type A with 7 of the additive while it was near 10 for coal of type B (from

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  • The Influence Of Calcite On The Ash Flow Temperature For

    Obtained outputs prove that A type coal has a lower value of sphere temperature than B type coal in the whole scope of percentage representation of the additive. The flow temperature dropped in total from 1489 °C to 1280 °C i.e. by 14 during the test of coal of type A with 7 of the additive while it was near 10 for coal of type B (from

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  • Influence Mechanism of Coal Crack Development on Coal

     · To study the regularity of anaerobic fermentation in coal during coal crack development a series of tests and analyses was carried out. Test objects included dynamic air percolation with crack evolution influence of changes in specific surface area and rate of O 2 percolation on anaerobic fermentation. The key factors affecting anaerobic fermentation at different zones of coal seam during

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  • Numerical Investigation of Complex Thermal Coal-Gas

     · Understanding the influence of temperature on the gas seepage of coal seams is helpful to achieve the efficient extraction of underground coal seam gas. Thermal coal-gas interactions involve a series of complex interactions between gas and solid coal. Although the interactions between coal and gas have been studied thoroughly few studies have considered the temperature evolution

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  • Experimental study on the influence of temperature cycle

    The critical temperature of anthracite is from 150°C to 200°C and the peak temperature is between 450°C and 500°C the range from 200°C to 250°C is the critical temperature of gas coal and

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  • Influence of heat treatment on dynamic and physical

    The dynamic mechanical behaviours of coal exposed to elevated temperatures are important in mining engineering especially in underground coal gasification. In this study anthracite specimens were

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  • The influence of temperature on methane adsorption in

    The capacity of coal to adsorb methane is greatly affected by temperature and in recent years temperature-dependent adsorption has been studied by many researchers.

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  • Influence of Stefan flow on the drag coefficient and heat

     · In this paper the influence of different Stefan flow intensities on the drag coefficient (Cd) and the Nusselt number (Nu) of supercritical water (SCW) cross flowing around a fixed spherical particle with Re in the range of 10–200 is studied at the same time the velocity and temperature boundary layers and the flow field around the particle

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  • Experimental study of the moisture content influence on

     · Teng et al. (2017) established a fully coupled multi physical model of coal deformation gas flow and water loss and got the water loss which improved the porosity and permeability of coal. In addition to studies of the influence of moisture content in coal on its gas adsorption characteristics some researchers also analyzed the influence of

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  • Ignition Characteristics of Coal–Water Slurry Containing

     · This paper examines a coal–water slurry containing petrochemicals (CWSP) based on lignite bituminous coal anthracite and typical waste—carbon residue obtained from the pyrolysis of tires. Waste motor oil is used as a liquid fuel component of the slurry. The study of CWSP ignition is performed via placing a fuel droplet on a low-inertia thermocouple junction (junction diameter is 0.1 mm

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  • Concerning the Glass Transition Temperature of Coal

    The blend treated at 300 °C had the highest tensile strength of 4.5 MPa. However coal had the lowest tensile strength due to the absence of glass transition phase which played a vital role in

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  • Influence of temperature on the wettability at theslag

    Influence of temperature on the wettability at theslag/carbon interface during pulverised coal injection in a blast furnace January 2002 Scandinavian Journal of Metallurgy 30(6) 370378

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  • Mechanical and Acoustic Emission Characteristics of Coal

     · Cao et al. (2000 2003) studied the effects of temperature and confining pressure on the damage evolution of coal and clarified that high temperature high pressure and differential stress were the important factors.

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  • Statistical analysis of the velocity field in a mechanical

     · An experimental investigation of a precessing jet issuing from a mechanically rotating nozzle directed at an angle of α=45° relative to the axis of rotation is reported. Both conventional and conditional statistics of the velocity field of the jet were measured using a combined hot-wire and cold-wire (to identify any reverse flow) probe. Three distinct values (≈0.005 0.01 and 0.02) of

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  • (PDF) Application of the thermoporoelasticity model in

    The poroelasticity model is expanded here by the influence of temperature and adjusted to the case where both liquid and highly compressible fluid are present in pores by using the gas laws.

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  • Effect of the Air Temperature on Combustion

     · This paper evaluates the effect of the air temperature on the combustion characteristics and NOx formation in a 0.5 MW laboratory furnace fired by a pulverized coal swirl burner with deep air staging. The temperature and compositions of flue gas and fly ash in the primary zone and the second burnout zone were sampled and measured. The results show that air temperature in the deep air

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  • Coal Combustion and Gasification Science

     · – chemical/physical influence of CO 2influence of lower jet velocitieslower overall flame temperature •Literature review shows only one laminar flow study of dense coal . . stream ignition (Annamalai 1990)9 vol- O253-75 µm Pee Wee coalapparent ignition from camera image

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  • Advances in Mechanical Engineering 2015 Vol. 7(6) 1–15

     · influence on the position of maximum stress. The increase in the thickness of the kiln crust can reduce the extreme value of stress. When the wind speed of induce fan inside the kiln is larger the temperature of each layer will be rela-tively high as well and the temperature curve is softer and the temperature variation is more stable.

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  • Research on the Burnout of Fujian Anthracite in CFB Boiler

     · Coal property boiler structural and designing parameters running parameters of boiler are the main factors which influence the burnout of Fujian anthracite during combustion in CFB boiler. These coal properties and combustion characteristics such as the compact inner structure of particle the poor combustion reactivity and the strong

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  • Concerning the Glass Transition Temperature of Coal

    The blend treated at 300 °C had the highest tensile strength of 4.5 MPa. However coal had the lowest tensile strength due to the absence of glass transition phase which played a vital role in

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  • The effect of temperature on various parameters in coal

     · This increase of CO 2 emission from fossil fuels has a dominant influence on the atmospheric CO 2 concentration that eventually results in rising global temperatures and sea level.

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  • Impact of temperature and pressure on the characteristics

     · The current study showed that heat injection via thermal displacement could accelerate the gas desorption and seepage velocity in coal. Therefore the influence of temperature and pressure should be carefully considered when using thermal displacement to increase gas production.

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  • Experimental study on the influence of coal powders on the

     · To explore the influence of drilling fluid mixed with coal powders on the wettability of the samples the contact angle of water base fluid and drilling fluid with 3 wt. powder mixed with corresponding substances on the surface of the lignite anthracite and shale were evaluated.

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  • Experimental study on the influence of temperature cycle

    The critical temperature of anthracite is from 150°C to 200°C and the peak temperature is between 450°C and 500°C the range from 200°C to 250°C is the critical temperature of gas coal and

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  • Analysis on the Secondary Carbonization Experiment and

     · seconds). The coal core temperature is 500 ℃ shown in thermocouple and at this time the temperature of tube center of coal is 855℃. These temperature are within the scope of coal coking temperature(℃). After natural cooling the coal sample is pushed out and its shape is

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  • Partial substitution of anthracite for coke breeze in iron

     · In the combustion tests on coke breeze and anthracite the heating temperature ranges from 20 to 1000 °C and the heating rate and flow rate of the artificial air were fixed at 10 °C min −1 and

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  • Numerical simulation of the influence of fuel temperature

    The effects of fuel temperature and injection parameter on biodiesel spray were studied. Transient flow characteristics inside nozzle are coupled to the spray calculation. A sensitivity analysis of t

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  • Study on the gas desorption law and indicator influencing

     · Qin 4 believes that gas in the adsorption state hardly participates in flow while gas in the free state is the main body of gas flow and the gas flow velocity is proportional to the pressure

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  • Effects of pre-oxidation temperature on coal secondary

     · The spontaneous combustibility order by pre-oxidation temperatures was 130 °C raw 50 °C 110 °C 90 °C and 70 °C. Being oxidized at 130 °C could promote coal to self-heat and being oxidized below 110 °C would inhibit coal self-heating.

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  • Investigations on Lean Coal Combustion for Different

    An experimental study was conducted to show the influence of the primary air velocity on lean coal combustion in a lateral-ignition tiny-oil burner. Using the lateral ignition scheme a lean-coal ignition experiment was conducted at a coal feed rate of 3.5 t / h and

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  • Study on the pore evolution law of anthracite coal under

     · 1 INTRODUCTION. Coalbed methane (CBM) as an associated product of coal formation and metamorphism processes has high calorific and efficient clean‐burning characteristics 1 2 and mainly exists in coal seams in three states the adsorbed state on the surface of the coal matrix free state in the pores and dissolved state in the water of the coal reservoir. 3 4 Statistically in China

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  • Study on the pore evolution law of anthracite coal under

     · The temperature of the coal reservoir sharply decreases causing damage to the pore structure of the coal reservoir due to the ultralow temperature of LN 2 during fracturing. Thus in this paper infrared thermal imaging (ITI) and nuclear magnetic resonance (NMR) were used to measure the temperature distribution and pore evolution law of

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  • Measurement of Gas Species Temperatures Coal Burnout

     · Measurements were performed on a 200 MWe wall-fired lignite utility boiler. For different overfire air (OFA) damper openings the gas temperature gas species concentration coal burnout release rates of components (C H and N) furnace temperature and heat flux and boiler efficiency were measured. Cold air experiments for a single burner were conducted in the laboratory.

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  • The Influence Of Calcite On The Ash Flow Temperature For

    The Influence Of Calcite On The Ash Flow Temperature For Semi-Anthracite Coal From Donbas District

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