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Trigeneration & Boiler Sizing Optimization
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Presentation at a Glance Overview Trigen Concept System Configuration Benefits & Risks Conclusions
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Trigeneration Concept
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Conventional Trigeneration
Trigen Facility
Natural Gas
Natural Gas
Boiler
Electricity
MVAC Chiller
Power Demand
Steam
Chilled Water
Hot Water
Utilities Requirement
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Electricity Cooling Heat
Trigeneration Schematic at GSK
Gas Engine
Alternator
Elec
tric
ity
Air
NG
1.8 MW
Exha
ust g
as St
eam
Boi
ler
Econ
omiz
er
Was
te H
eat
Rec
over
y B
oile
r
Feed
Wat
er
1.2 t/h
Hot
Wat
er
Hot
Wat
er
Econ
omiz
er
Hot
Wat
er R
etur
n
300 kWh
HT Transmission Cycle Heat Exchanger
HT Loop Absorption Chiller
200 RT
Chi
lled
Wat
er
Coo
ling
Wat
er
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Scheme Design
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Design Considerations
Gas Engine - higher power to heat ratio Waste heat boiler & hot water generator to
recover engine exhaust air (> 420 °C) Hot water Absorption chiller to recover GE
Jacket HT waste heat (> 90 °C) 100% hot water (consistent load) generation
from Trigen Fuel boiler with high turndown ratio
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Utilization > 90% per year Operating > 90% of capacity Equipment life span for 10+ year MVAC chiller & fuel boiler for 100% back-up Fuel boilers load as little as possible No impact on existing buildings appearance
Operational Requirement
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Initial Configuration
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GSK optimization project consists of: Trigenetaion: Gas Engine (2 MW rated capacity) Waste Heat Boiler (1.2T Steam @ 9 barg ) Absorption Chiller (200 RT Chilled Water) Hot water Generator (> 50°C Hot water) Boiler Downsizing 2 x 5T high efficiency dual fire boiler
Overview of system
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After Optimization
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Trigeneration Facility
Gas Engine
Waste Heat Boiler
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Hot Water Absorption Chiller
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Fuel Fire Boilers
Before After
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Benefits
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Support GSK climate change & sustainability commitment Improve energy efficiency Operational cost saving Support business continuity plan
Trigeneration = Business Sense
Why Trigeneration?
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Other Favorable Factors Right match for plant utilities usage profile
(consistent power, heating & cooling load) Natural gas available at competitive price Proven technology (availability >90%) Government policies to support green
initiatives e.g. GREET fund Support national policies demonstrated
(Energy Conservation Act)
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Integrated with 2 smaller boilers:
Reduce heat losses % vs amount energy input
Higher turndown ratio allow wider operating range
Lower regulatory requirement e.g. Steam Engineer requirement
Additional space in boiler room
Boiler Downsizing
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Annual energy consumption
Results
0
10,000
20,000
30,000
40,000
50,000
60,000
70,000
80,000
90,000
100,000
Before Improvement After Improvement
19,152 MWh
44,423 MWh
76,129 MWh
42,045 MWh
ElectricityGas
MWh Energy Reduction ~ 9%
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Potential Risks
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Fears & Threats Change of site utilities demand profile Electricity price drop or gas price increase Reliability issues Competent local vendor support Change of local regulatory requirement
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Conclusions
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Suitable for facilities with continuous and stable demand level/minimum fluctuation on heating, cooling and power Energy efficiency & benefits of Trigen
depend on ability to utilize all heat energy Overall Trigen efficiency varies between
70% - 80% depending on design & usage
Conclusions
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Absorption chillers offer substantial CO2 savings over electric chillers Available of Natural Gas supply at
competitive price is required to make the investment attractive Multiple small size equipment installation
provide more flexibility
Conclusions
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Thank you