WHUS	Waste heat recovery system
ORC	Organic Rankine Cycle
PPTD	Pinch Point Temperature Difference
EPC	Electricity Production Cost
RH	Regenerative heater
LTEs	Low-temperature economizers
THA	The design condition
HPT	High-pressure turbine
IPT	Intermediate-pressure turbine
LPT	Low-pressure turbine
HGHE	High-Temperature Gas-water heat exchanger
LGHE	Low-Temperature Gas-water heat exchanger
FSHE	First-stage heat exchanger
SSHE	Second-stage heat exchanger
ESP	Electrostatic precipitator
FGD	Flue gas desulfurization
NAR	The net annual revenue
ORCE	Organic Rankine Cycle Evaporator
ORCT	Organic Rankine Cycle Turbine
ORCC	Organic Rankine Cycle Condenser
HHV	Higher heating value
O&M	Operation and maintenance
CEPCI	Chemical Engineering Plant Cost Index
Pt	Dynamic investment pay-back period
GPO	Gross power output
EFG	Exhaust Flue Gas
AP	Air Preheating
BFGD	Bypass Flue Gas Duct
OEBI	Other Equipment of Boiler Island
TURB	Turbine
CD	Condenser
RS	Regenerative System
OETI	Other Equipment of Turbine Island
TIC	Total investment capital
EAI	Extra annual income
Symbols
$t_{\mathrm{adp}}$	Acid dew point, °C
$t_{\mathrm{wdp}}$	Dew point temperature of water, °C
$\beta$	Coefficient related to the excess air coefficient
$S_{\mathrm{ar},\mathrm{zs}}$	Sulfur content at as-received basis, kg/kcal
$A_{\mathrm{ar},\mathrm{zs}}$	Ash content at as-received basis, kg/kcal
${\alpha }_{\mathrm{ash}}$	Fly-ash share in the fuel gas
${\dot{Q}}_{\mathrm{evap}}$	Heat transferred in the ORC evaporator
${\dot{m}}_{\mathrm{wf}}$	Mass flow of the organic working fluid
${\dot{m}}_{\mathrm{s}}$	Mass flow of the heat source (flue gas)
${\dot{W}}_{\mathrm{ORCT}}$	Power output of the ORC turbine
${\eta }_{\mathrm{ORCT}}$	Isentropic efficiency of the ORC turbine
${\dot{Q}}_{\mathrm{cond}}$	Heat transferred in the ORC condenser
${\dot{m}}_{\mathrm{c}}$	Mass flow of the cooling water
${\dot{W}}_{\mathrm{ORCP}}$	Power consumed by the ORC pump, MW
${\eta }_{\mathrm{ORCP}}$	Isentropic efficiency of the ORC pump
${\dot{W}}_{\mathrm{ORC}}$	The net power output of ORC system, MW
${\dot{W}}_{\mathrm{ORCC}}$	Power consumed by the recycle cooling water pump, MW
$T_{\mathrm{s},\mathrm{in}}$	The inlet temperature of the flue gas, °C
$T_{\mathrm{s},\mathrm{out}}$	The outlet temperature of the flue gas, °C
$T_{\mathrm{s},\mathrm{r}}$	The temperature of the flue gas at the PPTD point, °C
$T_{\mathrm{c},\mathrm{out}}$	The outlet temperature of the cooling water, °C
$T_{\mathrm{c},\mathrm{in}}$	The inlet temperature of the flue gas, °C
$T_{\mathrm{c},\mathrm{r}}$	The temperature of the cooling water at the PPTD point, °C
$p_{\mathrm{ev}}$	Evaporating pressure, MPa
$p_{\mathrm{cond}}$	Condensation pressure, MPa
${\dot{E}}_{\mathrm{F},k}$	Fuel exergy, kJ/kg
${\dot{E}}_{\mathrm{P},k}$	Product exergy, kJ/kg
${\dot{E}}_{\mathrm{D},k}$	Exergy destruction, exergy loss
${\epsilon }_{\mathrm{tot}}$	The total exergy efficiency
$C_{\mathrm{BM}}$	Bare module cost, million USD
$f_{\mathrm{BM}}$	Bare module factor
S	The size parameters of equipment
$\alpha$	Scale factor
$PE{C}_{\mathrm{rerf}}$	Reference capital investment of the reference component, million USD
$S_{\mathrm{ref}}$	Scaling parameter of the reference component
K	Coefficients for the cost evaluation
$f_{\mathrm{M}}$	The Material factor
$f_{\mathrm{P}}$	The Pressure factor
$f_{\mathrm{T}}$	The Temperature factor
$f_{\mathrm{A}}$	The actualization factor
$∆P_{\mathrm{net}}$	Net additional power output, MW
$C_{\mathrm{e}}$	On-grid power tariff, USD/kWh
$\tau$	The equivalent full-load operation hours per year, h
$i$	Fraction interest rate per year, %
$n$	Number of years