One Question per Day (January 18, 2018)
Thread Content
There are two types of coal, which may be lignite or bituminous coal; their Vdaf value is greater than 37%, and their light transmittance (PM%) ranges from 30% to 50%. How can they be distinguished from each other? What kinds of coal are they respectively? Add an indicator: the high-volume calorific value on a constant humidity and ash-free basis, Qgr,maf. A value of ≤24 MJ/kg indicates lignite, while a value >24 MJ/kg indicates bituminous coal
Answer: Lignite is defined as coal with a constant-humidity, ash-free higher heating value Qgr,maf of ≤24 MJ/kg, while bituminous coal is defined as coal with such a value of >24 MJ/kg
Vdaf>37%, with PM% ranging from 30% to 50% for lignite; PM%>50% for bituminous coal, and G
In terms of moisture content, lignite has a high water content!
Based on the given conditions, it might be lignite
Generally, a PM value greater than 50% indicates long-flame coal; if the PM value is between 30-50%, then Qgr and maf need to be measured, and if their values are greater than 24 MJ/kg, it is still considered long-flame coal. For lignite, the PM value is between 30-50%, or at most up to 30%.
Add an indicator: the high-volume calorific value on a constant humidity and ash-free basis, Qgr,maf. A value of ≤24 MJ/kg indicates lignite, while a value >24 MJ/kg indicates bituminous coal
Add an indicator: the high-volume calorific value on a constant humidity and ash-free basis, Qgr,maf. A value of ≤24 MJ/kg indicates lignite, while a value >24 MJ/kg indicates bituminous coal
Add an indicator: the high-volume calorific value on a constant humidity and ash-free basis, Qgr,maf. A value of ≤24 MJ/kg indicates lignite, while a value >24 MJ/kg indicates bituminous coal
Add an indicator: the high-volume calorific value on a constant humidity and ash-free basis, Qgr,maf. A value of ≤24 MJ/kg indicates lignite, while a value >24 MJ/kg indicates bituminous coal
Add an indicator: the high-volume calorific value on a constant humidity and ash-free basis, Qgr,maf. A value of ≤24 MJ/kg indicates lignite, while a value >24 MJ/kg indicates bituminous coal