Thermodynamic and economic analyses of combined generation system based on hybrid prime mover of internal and external combustion engines with natural gas and biomass power sources

In this paper, a combined cooling, heating and power system based on hybrid drive of internal sand external combustion engines with biomass power source with a gasification reactor with air gasification agent and of the counter flow type is discussed and the synthesis gas obtained from this equipment is used in a gas-burning internal combustion engine. This proposed system has been compared with a similar cogeneration system with a natural gas power source, and energy and economic perspectives have been used for the system. The results show that the proposed system that uses synthesis gas as input fuel will have a significant advantage from energy and economic viewpoints compared to the case where natural gas is used as the main fuel, where the parameter related to the percentage reduction of primary energy consumption shows that if synthesis gas is used as a fuel in the drive of the internal combustion engine, compared to natural gas, it will save 40.55% in input energy consumption. The proposed system with synthetic gas fuel has a significant advantage from the economic point of view and the percentage of fuel consumption reduction, so that the results show a savings of 83.98% in fuel consumption costs. The results also show that the total price of electricity production in the proposed system with biomass and synthesis gas power source in different rotational speeds of the internal combustion engine will be lower and more economical compared to the cost of electricity production with natural gas fuel.