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3 edition of Studies of the Thickness of the Plastic Layer of Coals found in the catalog.

Studies of the Thickness of the Plastic Layer of Coals

United States. Bureau of Mines.

Studies of the Thickness of the Plastic Layer of Coals

Its Determination and Significance.

by United States. Bureau of Mines.

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Published by s.n in S.l .
Written in English


Edition Notes

1

SeriesReport of investigations (United States. Bureau of Mines) -- 6568
ContributionsKovalik, M., Wolfson, D., Fischler, F.
ID Numbers
Open LibraryOL21741060M

Start studying CHE Chapter Learn vocabulary, terms, and more with flashcards, games, and other study tools. A plane layer of coal, which may be treated as a solid slab of thickness L = m and thermal conductivity k = W m-1 K-1, experiences uniform volumetric heat generation at a rate of 26 W m-3, due to slow oxidation of the coal particles (i.e. slow combustion, releasing heat).

The Tongue River Member contains the thick coal beds and coal zones that are targets for coal mining and coalbed-methane production. The names of the sampled coal beds are those given by gas operators and do not necessarily follow USGS names and correlations as established in earlier studies by Mapel (), Culbertson and others (), Kent. Fossil Energy Study Guide: Coal Coal is the most plentiful fuel in the fossil family. The United States has more coal reserves than be up to feet thick. In surface mining, bulldozers clear and level the mining into the ceiling of the mined area to bind several layers of strata into a layer strong enough to support its weight.

  Abstract. The coal chars from northwestern part of China are characterized with high reactivity and low strength after reaction. Four type of coke-making coals selected from northwestern part of China were studied by proximate analysis, ultimate analysis, vitrinite reflectance analysis, and FTIR with curve-fitting analysis to obtain information on their chemical composition and chemical : Qiang Wu, Zizong Zhu, Guojing Shi, Feng Wang, Yangyang Xie. Deposition and slagging are common phenomena on furnace walls which cause increased thermal resistance and a decreased in the absorption of heat by the water wall, decreasing overall boiler output.


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Studies of the Thickness of the Plastic Layer of Coals by United States. Bureau of Mines. Download PDF EPUB FB2

Additional Physical Format: Online version: Kovalik, M.J. Studies of the thickness of the plastic layer of coals. [Washington, D.C.]: U.S.

Dept. of the Interior. Studies of the thickness of the plastic layer of coals: its determination and significance /Author: M. Kovalik, F.

Fischler and D. Wolfson. FRI, Dhanbad, Bihar, India (Received 4 November ) A study of the effect of ash yield on the maximum thickness of the plastic layer (MTPL) of some coking coals (as measured by the Sapozhnikov plastometer) has revealed that with an increase in the former the latter in general by: 1.

In-situ studies of the plastic layer were carried out using a lab-scale coke oven. Thicknesses of plastic layer were estimated from thermoplastic range and temperature profile. The fissure development and the maximum IGPs appeared to be sensitive to coal by: 3.

Extracts of the plastic layer of coals of different reductivity type and their blends L. Butuzova 1, S. 2*P. Marinov, R. Makovskyi, G. Butuzov1 1 Donetsk National Technical University, 58 Artema str., DonetskUkraine 2 Bulgarian Academy of Sciences, Institute of Organic Chemistry, Acad.

v str., Bl.9, SofiaBulgaria. Knowledge of the plastic properties of coal is necessary to a fundamental understanding of coal behavior and has practical application to the carbonization of coal.

Within a limited range of rank. coals soften on heating and resolidify as the temperature increases. Concurrent with this phenomenon, thermal decomposi- tion occurs and gas evolves.

In the situation where the measured thickness of the plastic layer is the same as the final contraction, Y/X has a value of 1, and Sapozhnikov's classification of coking coals, and semicokes, is divided into contraction types that have Y/X  and expansion types Y/X > by: 1.

Question: A Plane Layer Of Coal Of Thickness L = 1 M Experiences Uniform Volumetric Generation At A Rate Of Q W/m3 Due To Slow Oxidation Of The Coal Particles. Averaged Over A Daily Period, The Top Surface Of The Layer Transfers Heat By Convection To Ambient Air For Which Temperature = 25oC And H = 6 W/m2K, While Receiving Solar Irradiation In The Amount Gs.

The measured values of the maximum thickness of the plastic layer (Y), the final contraction of the volume curve (X), and their relationship, the Sapozhnikov Quotient (Y/X), have been used here with vitrinite reflectance in a new method to predict tumbler strength of coke.

A plane layer of coal of thickness L = 1 m experiences uniform volumetric generation at a rate of due to slow oxidation of the coal particles. Averaged over a daily period, the top surface of the layer transfers heat by convection to ambient air for which h = 5 W/m^2 middot K and T_infinity = 25 degree C, while receiving solar irradiation in.

[15] Haque R, Sharma SK, Das Gupta NN, Lahiri A. Thickness of plastic layer of coals: influence of rank, oxidation and additives on the maximum thickness of the plastic layer of coal. CLASSIFICATION OF INDIAN COAL Scientific Coding of Indian Coal 3 basic parameters and 1 supplementary parameter 1st digit () corresponds to Calorific value (dmmf) 2nd () one Volatile matter (dmmf) 3rd ()one Coke type 4th () one: Maximum thickness of plastic layer for Caking coal and M % for non caking.

The Y value is the maximum difference between the upper and lower plastic layer levels expressed in mm. Y values will typically range from mm. The X value equals the percent contraction, or shrinkage, of the coal briquette during the test.

X values generally range from %. The answer to “A plane layer of coal of thickness L 1 m experiences uniform volumetric generation at a rate of due to slow oxidation of the coal particles.

Averaged over a daily period, the top surface of the layer transfers heat by convection to ambient air for which h 5 W/m2 K and T 25 C, while receiving solar irradiation in the amount GS W/m2. The procedure is proposed for structuring complex coal deposits with respect to quality indexes using ArcGIS with a view to substantiate rational trends in mineral use.

The article reports the research on assorting Elginsk black coal reserves in South Yakutia based on volatile content, plastic layer thickness, coal grades, process groups and by: 2.

Environmental conditions, situation of the buried media, and operation temperature are some of the important factors that must be considered for the selection of appropriate coating system.

Single-layer FBE, dual-layer FBE, and three-layer polyolefins are the most used external coating systems for the pipelines (Fig. A plane layer of coal of thickness L 1 m experiences uniform volumetric generation at a rate of q W/m* due to slow oxidation of the coal particles. Averaged over a daily period, the top surface of the layer trans- fers heatby convection to ambient air for which h = 5 W/m2, K and T,°C, while receiving solar irradiation in the amount Gs.

The caking properties of the charges, characterized by the thickness of the plastic layer Y, lie in the range mm, remaining at the level of the similar charge on the average (variant 1).

Seventy-two to 84 plastic coals were used in the plasticity and carbonization tests; 43 nonplastic or weakly plastic coals were used in the coal-band studies. Plots of relations between volatile matter, carbon, and oxygen contents of 1, coals and the 84 coals used are shown.

Coal sampling and analysis standards 4 Abstract Each year, billions of tonnes of coal are traded in regional and international market for use in power generation, steel and cement making, and many other purposes.

In commercial operations, the price of coal not only. A plane layer of coal of thickness L?1 m experiencesuniform volumetric generation at a rate of due to slow oxidation of the coal particles.

Averagedover a daily period, the top surface of the layer trans-fers heat by convection to ambient air for whichh?5 W/m2?K and T??25C, while receiving solarirradiation in the amount GS?

W/m/5.The determination is based on the thickness y of the plastic layer formed upon heating, with the shrinkage x being taken into account; both y and x are expressed in millimeters.

Hard coals of the middle stages of coalification with a plastic layer 10–35 mm thick (rank varieties C .caking index (GR.I.) which is modified from Roga Index (ISO), maximum thickness of plastic layers (Y, mm), and maximum dilatation (b, %).

The gross moist ash free .