part 1: overview of cogeneration and its status in asia - Fire
part 1: overview of cogeneration and its status in asia - Fire
part 1: overview of cogeneration and its status in asia - Fire
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Cogeneration <strong>in</strong> Asia today 65<br />
Cogeneration <strong>in</strong> a plywood <strong>in</strong>dustry<br />
This is a factory located <strong>in</strong> South Sumatra, Indonesia. The <strong>in</strong>stallation consists <strong>of</strong> a turn-key<br />
supply <strong>of</strong> a wood-waste fired boiler to replace two exist<strong>in</strong>g boilers which cannot supply<br />
sufficient steam to operate an exist<strong>in</strong>g turbo-generator with a net output <strong>of</strong> 3.2 MW. About 35<br />
tph <strong>of</strong> steam generated at 35 bar <strong>and</strong> 380°C with the new efficient boiler would be adequate<br />
for meet<strong>in</strong>g the turbo-generator requirement as well as that needed for the process. The<br />
overall project cost is US$ 1.6 million <strong>and</strong> the payback period works out as 2.4 years.<br />
Cogeneration from palm oil waste<br />
The factory is located <strong>in</strong> Johor, Malaysia. The waste from the mill will be fed to the proposed<br />
steam boiler to produce 35 tph <strong>of</strong> steam at 23 bar. This steam is expected to pass through a<br />
backpressure turb<strong>in</strong>e to generate 1.2 MW <strong>of</strong> power <strong>and</strong> the exhausted steam at 4.1 bar will be<br />
adequate to meet the process steam requirements. The total cost <strong>of</strong> the project is estimated<br />
as US$ 693,300 <strong>and</strong> the payback period is calculated as 3.7 years.<br />
Cogeneration <strong>in</strong> a paper mill<br />
The factory is located <strong>in</strong> Chachoengsao, Thail<strong>and</strong>. Earlier, 24 tph <strong>of</strong> steam was produced <strong>in</strong><br />
an exist<strong>in</strong>g rice husk-fired boiler at 20 bar <strong>and</strong> was passed through a pressure-reduc<strong>in</strong>g valve<br />
to meet the process heat<strong>in</strong>g requirement at 6 bar. The project consists <strong>of</strong> <strong>in</strong>troduc<strong>in</strong>g a<br />
backpressure turb<strong>in</strong>e after the boiler so that the steam at 20 bar can be exp<strong>and</strong>ed up to the<br />
required pressure <strong>of</strong> 6 bar, while generat<strong>in</strong>g 600 kW <strong>of</strong> electricity. The cost <strong>of</strong> the turb<strong>in</strong>e with<br />
the accessories is US$ 102,000, which leads to a very short payback period <strong>of</strong> 1.4 years.<br />
Energy from waste water <strong>in</strong> rubber factory<br />
The factory is located <strong>in</strong> Selangor, Malaysia. The project consists <strong>of</strong> wastewater treatment<br />
plant that will treat the liquid effluents from the factory by anaerobic digestion to produce<br />
around 7,820 Nm 3 <strong>of</strong> biogas per day. This biogas will <strong>part</strong>ially substitute the medium fuel oil<br />
used <strong>in</strong> the exist<strong>in</strong>g thermal fluid heater. The project cost is estimated as US$ 1.5 million <strong>and</strong><br />
the payback period works out as 4.1 years.
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