Feed coal analysis

TABLE I. Analysis of Feed Coal to Run 242, T102 Bottoms After Grinding and Mixing, and Materials Produced by Supercritical... 

Calculations were carried out for unit mole of carbon in feed coal (MAF basis). Since the empirical formula of feed coal is denoted by CHo.8390o.o96N0.018s0.019 its molecular weight per unit mole of carbon is 15.236. In the present exergy analysis, the exergy input to the liquefaction system is 528.71 kj, which corresponds to the exergy value of 1 mol-C of feed coal, as shown in Table V. 

Table L Metals Analysis of Reactor Deposit and Feed Coal From Run FB-61...

Feed gas analysis calculated from product gas analysis before feeding of coal... 

In the dry-fed system, the feed coal is pressurized, whereas nitrogen is only needed to All the void space between the particles. From laboratory analysis, a bulk density of 896 kg/m and an apparent density of 1483 kg/m of the precrushed SAf coal yielding a voidage of e = 0.4 was set as constant for all coals. 

Media Si. Media are suppHed in several size grades and the grade used varies at each plant. The finer grades improve media stabiUty, but finer particles are more difficult to recover and the feed rate of these finer-grade slurries should be reduced by a factor of 0.5—0.75 to maintain magnetic recovery. A typical size analysis as used in various heavy-media separation plants treating coal (qv) is given in Table 4. 

Since both the direct and phased approaches offer, at least in principle, equal promise for ultimate success (i.e., comprehensiveness and complete characterization), it is worthwhile to examine their relative resource requirements. Several studies were conducted with the objective of comparing the costs of direct and phased (with elimination of low priority streams) sampling and analysis approaches. (2,3] A number of processes were evaluated during these studies and the results for two unit operations — a limestone wet scrubber and full-scale low-Btu coal gasifier — are taken as examples. The scrubber involved seven feed or waste stream sampling sites. The gasifier contained 70 identifiable stream sampling points. The total estimated costs for both processes by both approaches are shown in Table I. 

Table V summarises the data of the sulphur analysis of the hydrocracked liquids and the various bpt fractions for CoMo and NiMo catalysed experiments. The sulphur contents of neither the total hydrocracked liquids nor the individual bpt fractions showed any dependence on repeat contact or catalyst type. The values did show that the sulphur concentrated in the recycle solvent fraction (275-450°C), suggesting that, even under the relatively strong conditions used, certain sulphur-containing compounds will survive to be recycled in the solvent However, the sulphur content of the coal liquid feed was reduced by about 50% and the sulphur content of the likely upgradable product was low.

The melt used in this work was prepared from the residue of hydrogen-donor extraction of Colstrip coal with tetralin solvent in such a way as to simulate the composition of an actual spent melt. The extraction was conducted in the continuous bench-scale unit previously described (17) at 412°C and 50 min residence time. The residue used was the solvent-free underflow from continuous settling (17) of the extractor effluent. The residue was then precarbonized to 675°C in a muffle furnace. The melts were blended to simulate the composition of a spent melt from the direct hydrocracking of the Colstrip coal by blending together in a melt pot zinc chloride, zinc sulfide, and ammonium chloride, ammonia, and the carbonized residue in appropriate proportions. Analysis of the feed melt used in this work is given in Table I. 

Washability analysis procedure used in a laboratory before preparation plant design to determine the cleaning processes to be employed and used during normal operation to evaluate the performance of the cleaning equipment and the amenability of the raw coal feed to the cleaning processes chosen (ASTM D-4371). 

COAL AND CHAR FEED ANALYSIS % by wt - Moisture Free Basis... 

The anticipated product slate from a typical commercial plant feeding 33,500 tons per stream day of dry coal is given in Table II. This product slate is based on conversion of a typical Pittsburgh seam coal from West Virginia. The ultimate analysis of the coal used as a design basis is given in Table III. 

The assumption (d) imposed in deriving the model appears to be valid for both types of combustors since the feed rate of coal is relatively small under normal operating conditions. The order of magnitude analysis shows that the convective uc, is... 

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