Page 85 - Sustainable On-Site CHP Systems Design, Construction, and Operations

Power Equipment and Systems 63

CHP Plant System Requirements
The type of CHP prime mover and the type of thermal production and uses employed
at a CHP plant will determine the support systems required. For a CTG, the following
typical systems will be required:
• Combustion-air system: louvers, ducting, air filters, turbine inlet cooling, inlet
air silencer
• High-pressure gas system: gas compressors
• Low-pressure gas system: pressure reducing valves
• Turbine exhaust system: ducting, duct burners, superheater, HRSG, emission
control system, CEMS (continuous emissions monitoring system)
• Electric power generator distribution system: substations, switchgear, motor
control centers, protections
• Lube oil system: lube oil cooler, lube oil pump, day tanks
• Fire protection
• Chemical storage and emergency showers

For a CTG CHP system using a HRSG, the following typical systems will also be
required:
• Main steam system: nonreturn valve, pressure reducing valves, steam traps to
remove condensate
• Condensate system: condensate receiver(s), condensate pumps, deaerating feed
tank
• Feedwater system: feedwater pumps, feedwater control station (feedwater control
valves)

Emission control systems typically have support subsystems, such as ammonia/
urea storage and delivery. For an IC reciprocating engine CHP plant, the following
typical systems will be required:
• Combustion-air system: louvers, ducting, air filters, inlet air silencer
• Low-pressure gas system: pressure reducing valves
• Engine exhaust system: piping, heat recovery hot water generator, emission
control system, CEMS
• Electric power generator distribution system: substations, switchgear, motor
control centers, protection devices (see Chap. 11)
• Jacket water system: jacket water pumps, expansion tank, radiator, heat
exchangers
• Hot water supply and return system: hot water pumps, heat exchangers, coils,
control valves
• Lube oil system: lube oil cooler, lube oil pump (if needed or not supplied on the
engine), day tanks