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effects include corrosion of LFG collection pipes, fittings, meters, crankshaft, camshaft, gas- powered engine and bearings. A landfill gas with a high concentration of sulphur requires treatment. One should also note that landfill gas is saturated with water vapour. Drying LFG prior to its utilisation will limit corrosion of gas-fired units. In addition, an engine will run for a longer period of time when it is properly operated. Continuous operation is best for an engine. Frequent switching on and off adversely affects engine operation because condensate accumulates as the engine cools down, leading to acid formation [22]. Employing reciprocating engines for combined heat and power (CHP) generation yields very good results. CHP plants using gas-powered reciprocating engines usually produce hot water or saturated steam. Heat is recovered from the heat exchanger on engine casing, oil cooler and exhaust heat exchanger (Figure 11). Figure 11. Cogeneration with gas engine diagram. Source: [23]. A basic CHP system comprises a combined heat and power unit, power safety system, auxiliary drive switchgear, oil system and cooling system. The working engine powers a generator that produces electricity. During operation, the reciprocating engine warms up, producing heat which is recovered by the oil cooling system, and emits large amounts of heat to the atmosphere in the form of exhaust gases. In a CHP system, both types of heat are recovered by a heat exchanger system. Both types of heat are 45PDF Image | Landfill Gas Energy Technologies
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