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

104 Part3: Summary of country studies – Bangladesh and Viet Nam
• Peak steam demand (occurred in June): 12,950 kg/hr
• Base steam demand (occurred in November): 5,000 kg/hr
• Total steam consumption in 1991: 5.7×10 4 tons
• Total bunker oil consumption in 1991: 4.6×10 6 litres
c) Power to heat ratio
Monthly power to heat ratio in 1996 of the CCP plant varies from 64.4 MWh/TJ to 105.9
MWh/TJ, the average value being 82.8 MWh/TJ or 0.3 kWe/kWth (see Figure 2.1).
Power to Heat Ratio (MWh/TJ)
110
100
90
80
70
60
50
40
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Feb.
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May
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Jul.
Month
Figure 2.1 Monthly power to heat ratio of the CCP plant
2.2.2 Identification of Alternative Cogeneration Options
For the average power to steam ratio of 82.8 MWh/TJ of the factory, typical cogeneration
system used is the steam turbine. However, reciprocating engine and gas turbine
cogeneration systems were also included as potential alternatives because these are:
• applicable in small-scale cogeneration systems.
• commonly used configurations in the Philippines.
• simple and easy-to-grasp technologies.
a) Sizing of cogeneration system
Based on the results of the energy demand analysis, each of the above candidate
cogeneration systems was sized to meet either the manufacturing plant's process steam
(thermal match) or electricity requirements (power match). From the analysis of the plant's
electricity and steam usage pattern, base and peak process heat requirements of 5,000
kg/hr, 13,000 kg/hr are used for thermal matching. Likewise, base and peak power
requirements of 1,500 and 2,430 kW are investigated for power matching.
Aug.
Sep.
Oct.
Nov.
Dec.