Landfill Gas Composition
Landfill gas composition and production rates are primarily affected by the waste that has been deposited in the landfill site. MSW contains 150-250 kg of organic carbon per tonne which micro-organisms convert to landfill gas via anaerobic processes. The gas formation is influenced by a number of factors such as waste composition, landfill storage height and density, air temperature, atmospheric pressure and precipitation levels. Landfill gas production starts one to two years after the waste is deposited in the landfill and lasts 15-25 years. The continuously decreasing landfill gas volume can be compensated by the disposal of additional waste during this period. With a calorific value of 3.5 to 5.5 kWh/Nm3 (35-55% methane), landfill gas constitutes a high-value fuel for gas engines that can be effectively used for power generation.
Landfill Gas ComponentComposition (by volume)
Carbon dioxide (CO2)30-44%
Consequently, 1 million tonnes of MSW generate 1.7-2.5 million M3 of collectable methane, enough to fuel a gas engine capacity of 850-1,250 kW reproducing 6,500 to 10,000 MWh of electricity per year. That roughly corresponds to the average power demand of 1,500-2,200 EU households.
The Amico鈥檚 Landfill Gas Concept
The broad range of Amico鈥檚 landfill gas engines is specifically designed to run at full load with high efficiency and high availability, despite a low heating value and fluctuating gas quality and pressure. The high quality and specially designed engine parts resist the impurities that usually appear in this type of fuel. Before the landfill gas can be fed into the gas engines, it needs to be dried and compressed. Severe contaminants such as siloxanes should be removed if exceeding a certain level. Not only will these measures considerably increase the availability of the generator, but they will also reduce the costs associated with operation.
Since landfills are usually located near big cities, emission standards are becoming more and more ridged in many countries. To comply with these standards, the whole system must be managed, beginning with the fuel gas conditions up to the installation of an exhaust treatment service, if needed.China Open Type Landfill Gas Generator Sets manufacturers