part 1: overview of cogeneration and its status in asia - Fire

106 Part3: Summary of country studies – Bangladesh and Viet Nam
= ( )
− × η × η
H H
in out tb gen
3 . 6
Where, PHR = power to heat ratio
Hin
(kWe/(ton/hr of steam)
= enthalpy of the turbine inlet steam, kJ/kg
Hout = enthalpy of the turbine outlet steam, kJ/kg
ηtb
= turbine efficiency
ηgen = generator efficiency
• Power Generation (for thermal matching)
P =
PHR xS xHR CF
o
10
Where, P = electricity generation, MWh/year
6
PHR = power to steam ratio, kW/(ton/hr of steam)
So
= process steam to be met, kg/hr
CF = factor for continuous operation, 0.9-0.95
HR = actual working hours per year
• Heat Generation (for power matching)
S =
×
P x H xHR xCF
o out
PHR x 10
Where, S = heat generation, TJ/year
Po
• Fuel Consumption
= power to be met, kW
Hout = enthalpy of the turbine outlet steam, kJ/kg
6
PHR = power to steam ratio, in kW/(ton/hr of steam)
F =
(H - H ) x S x HR x CF
in f
η
b
′
×
10
Where, F = fuel consumed by the cogeneration system, TJ/year
Hin
Hf
= enthalpy of steam at turbine inlet, kJ/kg
= enthalpy of feedwater, kJ/kg
S' = steam flowrate, kg/hr
nb
= boiler efficiency
9