id	keyword
fens-494	coal
fens-494	biomass
fens-494	food
fens-494	burner
fens-494	gas
fens-494	combustion
fens-494	volume
fens-494	temperature
fens-494	zasiadko
fens-494	issue
fens-494	air
fens-494	xvi
fens-494	environment
fens-494	safety
fens-494	model
fens-494	flow
fens-494	heat