Steam Boilers, Engines, Nozzles and Turbines
Coke is produced by

Pulverizing coal in inert atmosphere
Strongly heating coal continuously for about 48 hours in the absence of air in a closed vessel
Enriching carbon in the coal
Heating wood in a limited supply of air at temperatures below 300°C

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Steam Boilers, Engines, Nozzles and Turbines
Spontaneous combustion is a phenomenon in which

Coal bursts into flame without any external ignition source but by itself due to gradual increase in temperature as a result of heat released by combination of oxygen with coal
Explosion in furnace
All the fuel burns instantaneously producing high energy release
Fuel burns with less air

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