Abstract
The paper is concerned with an integrated system of internal combustion engine and mini combined heat and power plant (ICE-CHP). The system is based on multi-stage wood biomass gasification. The use of producer gas in the system affects negatively the internal combustion engine performance and, therefore, reduces the efficiency of the ICE-CHP plant. A mathematical model of an internal combustion engine running on low-calorie producer gas was developed using an overview of Russian and foreign manufacturers of reciprocating units, that was made in the research. A thermal calculation was done for four-stroke gas engines of different rated power outputs (30, 100 and 250 kW), running on producer gas (CO2 – 10.2, CO – 45.8, N2 – 38.8%). Thermal calculation demonstrates that the engine exhaust gas temperature reaches 500 – 600°C at the rated power level and with the lower engine power, the temperature gets higher. For example, for an internal combustion engine power of 1000 kW the temperature of exhaust gases equals 400°C. A comparison of the efficiency of engine operation on natural gas and producer gas shows that with the use of producer gas the power output declines from 300 to 250 kWe. The reduction in the effective efficiency in this case makes up 2%. The measures are proposed to upgrade the internal combustion engine to enable it to run on low-calorie producer gas.
Highlights
Natural gas can be used as a fuel in spark-ignition carburetor internal combustion engines for stationary and transport applications
The main type of engines running on gaseous fuel is stationary internal combustion engines that are normally used in low-power gas engine power plants
A great advantage of gas-fuelled engine power plants is their capability to operate on different types of gas
Summary
Natural gas can be used as a fuel in spark-ignition carburetor internal combustion engines for stationary and transport applications. The main type of engines running on gaseous fuel is stationary internal combustion engines that are normally used in low-power gas engine power plants. Energy of fuel combustion in the engine cylinders performs mechanical work that provides operation of generators generating electric power.
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