#### The Sugar Engineers

# Boiler Evaporation Coefficient

The evaporation coefficient is the quantity of steam in tons generated per ton of fuel consumed. The gross evaporation coefficient

x

is given by
x = η_{B}·HCV / (h_{st} - h_{fw})

where

η_{B}

is the boiler efficiency, based on HCV
HCV

is the Higher Calorific Value of the fuel
h_{st}

is the enthalpy of the high pressure steam
h_{fw}

is the enthalpy of the feed water

If the fuel is bagasse then the quantity of steam in tons generated per ton of cane crushed is given by

y = x · (F%C - FibreLost%C) / F%B

where

F%C

is the fibre content of the cane in percent less the fibre lost in juice and the fibre lost in the mud filters and
FibreLost%C

is the fibre lost in juice and
F%B

is the fibre content of the bagasse in percent