Dry, mineral matter-free basis: Data or results are calculated to a theoretical base as if there were no moisture or mineral matter in the coal sample (ASTM method D388-12; American Society for Testing and Materials, 2013, p. 390–396). For this basis, a calculation is needed to determine mineral-matter content rather than ash yield.
The Proximate Analysis of any coal i.e. the % content of Moisture, Ash (A), Volatile Matter (VM), Fixed Carbon (FC) – also Sulphur (S) and Calorific Value (CV) – can be expressed on any of the above bases. Conversions To obtain: multiply ar by: Air Dry Dry Basis As …
The results of a coal analysis may be reported on any of several bases, differing from each other in the manner by which moisture and ash are treated. Except for data reported on a dry basis, it is essential that an appropriate moisture content be given in the data report.
Chemical analysis of coal ... (air-dry basis). As seen in Table 4.3, the ash value of the washed coal sample is 12.6 wt. %, which is a relatively low ash content compared to South African ROM coals. However, according to Lang (1986), an ash content of 12.6 wt. % is …
Residual moisture: Moisture (water) remaining in coal after air-drying a sample and minor heating in a moisture oven to 10 to 15°C (depending on coal rank) above room temperature (ASTM method D121-09; American Society for Testing and Materials, 2013, p. 355–368). It is recorded on an as-determined basis (denoted as "ad" or "AD").
The Orsat analysis of the combustion gases give the following result 13.0% (CO2 + SO2), 0.76% CO, 6.17% O2, 0.87% H2, and 79.2% N2. Calculate: a) mass of coal fired/ 100 kmol of dry flue gas b) mole flue gas/mol dry air c) moles of water vapor in the flue gas per 100 kg coal if the air supplied is dry d) % excess air
Dry Basis (db): excludes all Moisture Dry Ash Free (daf): excludes all Moisture & Ash The Proximate Analysis of any coal i.e. the % content of Moisture, Ash (A), Volatile Matter (VM), Fixed Carbon (FC)– also Sulphur (S)and Calorific Value (CV)– can be expressed on any of the above bases. Coal Conversion Facts
coal often form the basis of sale contracts, and payment ... and inorganic (mineral) matter, and exhibits a wide range of physical properties. The analysis of coal is generally performed on the coal samples taken from the bulk material and not from ... air dry AAS atomic ...
Air Dried (AD) - includes inherent equilibrium moisture (IM) only Dry Basis (DB) - exludes all moisture Dry Ash Free (DAF) - exludes all moisture and ash The proximate analysis of any coal, the % contents of Ash, Volatiles, Fixed Carbon, also Sulphur and Calorific Value can be expressed on any of the above bases. Conversions
AR is As Received Basis AD is As Determined (Air Dried) Basis Dry is Dry Basis DAF is Dry Ash Free Basis; Two Stage Total Moisture Formula (Refer to ASTM D3302 section 10) Two stage total moisture determination is used when the coal sample is too small mass or too wet to divide or crush without the potential of losing significant amounts of ...
Air dried basis: The coal has naturally dried in the open air until it cannot dry or dissipate any more moisture. Use the coal in air dried basis to represent coal content. 3. Dry basis: An analysis expressed on the basis of a coal sample from which the total moisture has in theory been removed. Coal in dry basis includes all contents but moisture.
ADL = air-dry loss, weight % of as-received sample. See Method D 2013 H = hydrogen, weight % Ox = oxygen, weight % 5.3 Subscripts used in this practice: ad = as-determined ar = as-received d = dry daf = dry, ash-free (equivalent to moisture and ash free, maf) 6. Methods for Calculating Data 6.1 Converting from the analysis sample basis to the as-
AR is As Received Basis AD is As Determined (Air Dried) Basis Dry is Dry Basis DAF is Dry Ash Free Basis; Two Stage Total Moisture Formula (Refer to ASTM D3302 section 10) Two stage total moisture determination is used when the coal sample is too small mass or too wet to divide or crush without the potential of losing significant amounts of ...
2 EXPERIMENTAL. A Spanish subbituminous A coal named Encasur was used in the liquefaction experiments. It was first dried in air and then ground and sieved to a particle size of 100–200 μm. Its analysis, wt % on an air dried basis (as was used for the experiments) is the following: moisture = 3.6, ash = 22.3, volatile matter = 25.9, G.C. V ...
Air dried basis (ad): A means of expressing an analytical result based on the condition in which a solid mineral fuel is in equilibrium with atmospheric humidity. Dry basis (d): a means of expressing an analytical result based on the condition in which the solid mineral fuel is free from moisture