Fuels and Combustion
Increase in ash content of blast furnace coke

Does not affect its consumption in the furnace
Reduces its consumption in the furnace
Increases its consumption in the furnace
Decreases its hardness and abrasion resistance

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Fuels and Combustion
Producer gas containing least amount of tar is produced by the

Partial combustion of coal
Partial combustion of large size (< 50 mm) coke
Atmospheric pressure gasification of coal (e.g., in Kopper-Totzek gasifier)
High pressure gasification of coal (e.g. in Lurgi gasifier)

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Fuels and Combustion
Bright coal

Contains more than 90% fussain
Contains more than 90% durain
Is non-coking
Contains mainly vitrain & clarain and is generally coking

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