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Rank of coal

The tiansition from a choice of multiple fossil fuels to various ranks of coal, with the subbituminous varieties a common choice, does in effect entail a fuel-dependent size aspect in furnace design. A controlling factor of furnace design is the ash content and composition of the coal. If wall deposition thereof (slagging) is not properly allowed for or controlled, the furnace may not perform as predicted. Furnace size varies with the ash content and composition of the coals used. The ash composition for various coals of industrial importance is shown in Table 3. [Pg.143]

Coal storage results in some deterioration of the fuel owing to air oxidation. Moreover, if inadequate care is taken, spontaneous heating and combustion may result. As the rank of coal decreases, it oxidizes more easily and must be piled more carefully. Anthracite does not usually present a problem. [Pg.231]

The bulk density of broken coal varies according to the specific gravity, size distribution, and moisture content of the coal and the amount of settling when the coal is pded. Following are some useful approximations of the bulk density of various ranks of coal. [Pg.2360]

The Fischer assay is an arbitrary but precise analytical tool for determining the yield of produces from low-temperature carbonization. A known weight of coal is heated at a controlled rate in the absence of air to 773 K (932°F), and the produces are collecled and weighed. Table 27-3 gives the approximate yields of products for various ranks of coal. [Pg.2361]

TABLE 27-3 Fischer-Assay Yields from Various Ranks of Coal (As-Received Basis)... [Pg.2361]

It is estimated that approximately 0.9 to 2.1 m of reasonably compacted plant material was required to form 0.3 m of bituminous coal. Uifferent ranks of coal require different amounts of time. It has been estimated that the time required for deposition of peat sufficient to provide 0.3 m of the various ranks of coal was lignite, 160 years bituminous coal, 260 years and anthracite, 490 years. Another estimate indicates that a 2.4 m bed of Pittsburgh Seam (bituminous) coal required about 2,100 years for the deposition of necessaiy peat, while an anthracite bed with a thickness of 9.1 m required about 15,000 years. [Pg.257]

Clarke, L. Storch, H.H., "Hydrogenation and Liquefaction of Coal, Part 2 - Effect of Petrographic Composition and Rank of Coal", Technical Paper 642, US Bureau of Mines, 1942. [Pg.77]

In this study, we have tried to find a more comprehensive parameter related to coal reactivity, as represented hy conversion, hy liquefying several ranks of coals. These cover a wide range from lignite to bituminous coal. Also we have studied the difference of coal reactivity caused hy the mining sites in Australian brown coal mines. Selected coals from a wide range of rank are located in the coal hand shown in Fig.2. The resulting parameters are compared with other parameters reported hy other researchers (2, 3.) ... [Pg.82]

Rank of coals from lignite lignite from lignite from lignite... [Pg.89]

Other reservoir properties being similar, high-rank coals are more favorable for C02 storage because of their methane displacement efficiency (related to lower sorption selectivity for C02 compared to methane and higher absolute sorption of methane with increasing rank see Figs 1 and 3). Higher ranks of coal are also more... [Pg.149]

Lee summarized the panel discussion at a meeting of the Environmental Health Sciences Advisory Council which concentrated primarily on the etiology of CWP (1). One area of research recommended by the panel was what component(s) is associated with a specific rank of coal that results in increased incidence of CWP. Warden, in discussing the medical aspects of CWP, stated that the fate of the particulates retained... [Pg.56]

Figure 1, The increase of rank of coal with depth in the Nordlicht Ost 1 well (on the basis of vitrite analyses)... Figure 1, The increase of rank of coal with depth in the Nordlicht Ost 1 well (on the basis of vitrite analyses)...
Figure 2. The increase of rank of coal (vitrite) with depth, based on data from deep borings with flat lying beds (scheme according to Patteisky and M. Teichmiiller (17))... Figure 2. The increase of rank of coal (vitrite) with depth, based on data from deep borings with flat lying beds (scheme according to Patteisky and M. Teichmiiller (17))...
Figure 5. The increase of rank of coal (on the basis of vitrite analyses) towards the magnetic anomaly near Bramsche. kru = Weatden (Lower Cretaceous) kroi = Cenomanian krot = Upper Campanian (Upper Cretaceous). The numbers at the margin of the map indicate the numbers of the single topographic maps 1 25 000... Figure 5. The increase of rank of coal (on the basis of vitrite analyses) towards the magnetic anomaly near Bramsche. kru = Weatden (Lower Cretaceous) kroi = Cenomanian krot = Upper Campanian (Upper Cretaceous). The numbers at the margin of the map indicate the numbers of the single topographic maps 1 25 000...
Another proof of the importance of temperature is the fact that there is often a strict relationship between the run of isovols and the run of isotherms in deep profiles, both being influenced no doubt by the varying thermal conductivity of the different rocks. The strong influence of temperature on the rank of coal is obvious in the case of contact-metamorphic coals, whose rank increases distinctly when approaching the intrusive body. Apart from these geological observations, all experiments on artificial coalification have shown that temperature is the decisive factor in the coalification process. Thermodynamic and reaction kinetic considerations (9) also support this opinion. [Pg.143]

Figure 9. The increase of rank of coal in the immediate vicinity of the Sutan overthrust near Bochum (after M. TeichmuUer (25) ... Figure 9. The increase of rank of coal in the immediate vicinity of the Sutan overthrust near Bochum (after M. TeichmuUer (25) ...
The proof of the influence of time on the rank of coal can be found in the following comparison Kuyl and Patijn (13) have described subbituminous... [Pg.148]

If such a formation with an incomplete coalification is folded, the run of the isovols will of course be different from that found in the Ruhr Basin as shown in Figure 7. This situation occurs in the Saar-Lorraine Basin. There the planes of equal rank of coal—on the basis of moisture content and calorific... [Pg.150]

Figure 18. Relations between rank of coal (volatile matter), temperature, and time of coalification (after Karweil (12)) (Z is a conversion factor relating volatile matter to coal rank)... Figure 18. Relations between rank of coal (volatile matter), temperature, and time of coalification (after Karweil (12)) (Z is a conversion factor relating volatile matter to coal rank)...
America, but the higher average apparent rank of coal suggests that its igneothermal history has been somewhat different. [Pg.171]

Dr. Teichmuller Very often it is impossible to separate the influence of overburden pressure and the influence of rock temperature on rank of coal in a subsidized formation. [Pg.220]

Drs. Pregermain and Deduit. Yes. The size of the areas as related to the rank of coal was studied by B. Alpem (4). [Pg.261]


See other pages where Rank of coal is mentioned: [Pg.92]    [Pg.213]    [Pg.231]    [Pg.2358]    [Pg.2360]    [Pg.258]    [Pg.94]    [Pg.94]    [Pg.38]    [Pg.86]    [Pg.97]    [Pg.97]    [Pg.128]    [Pg.148]    [Pg.786]    [Pg.101]    [Pg.4]    [Pg.320]    [Pg.143]    [Pg.144]    [Pg.149]    [Pg.200]    [Pg.220]    [Pg.221]    [Pg.456]    [Pg.486]    [Pg.92]   
See also in sourсe #XX -- [ Pg.133 , Pg.419 ]




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