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ACE Power is one of the leading IPPs of Sri Lanka with 3 different plants, including the Embilipitiya site (APE) with an installed capacity of 100 MW employing 14 units of Caterpillar 16CM32 engines that run on heavy fuel oil. 2.2 Caterpillar 16CM32 engine APE uses the Caterpillar Diesel Engine 16CM32 as the prime mover for driving alternators to generate electricity. The 16CM32 is a medium speed, 4-stroke, 16-cylinder, V-type with 32 cm cylinder diameter, turbocharged intercooled marine engine with direct fuel injection. The major characteristics of the engine could be tabulated as given in Table 2.2. Table 2.2 Mechanical specification according to the supplier Caterpillar Diesel Engine 16CM32 Rated power output 7520 kW Specific fuel consumption 177 g/kWh at 100% mechanical engine output Design 16 cylinder V-type arrangement 750 rpm, Direct injection Compressed air starting Rotation counter clockwise Exhaust gas turbocharging and charge air cooling Operating on heavy fuel oil, 180 cSt at 50 oC Specific fuel consumption at the generator terminals 194.2 g/kWh at 100% electrical output 2.3 HeatBalanceoftheengineunit A medium speed diesel engine unit built for power generation is meant to convert the chemical energy of the fuel into useful mechanical energy to drive an alternator. The typical efficiency of this energy conversion measured from fuel chemical energy to electrical output at the alternator’s terminals, is usually above 40% depending on the type and size of the prime mover. It is noteworthy that among the different energy flows out of the engine including the waste heat streams, the engine exhaust gas alone carries up to 30% of the total primary fuel energy [12]. In the case of typical medium speed internal combustion engines about 28% [1] of the total energy is rejected with the hot exhaust gas. As illustrated in Figure 2.2, heat energy is lost to the environment without useful work in the forms of: 1. Exhaust gas 2. Jacket cooling water or jacket cooler 3. Lubrication oil cooler 4. Charge air cooler or intercooler 5. Radiation loss 6PDF Image | waste heat recovery steam power system for ACE Embilipitiya
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