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 = 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