Abstract
Waste to energy (WtE) introduces an appropriate solution for municipal solid waste (MSW) disposal and greenhouse gas emission reduction. In this study, for Varamin MSW management, a gas turbine plant with heat recovery unit that is fed by landfill gas (LFG) and combined heat and power (CHP) incineration plant is investigated and compared as two WtE systems to reveal the best plant effectively. Exergy and environmental analyses of two systems are performed. Moreover, the effects of key parameters as decision variables on the energy and exergy efficiencies are identified by sensitive analysis of both systems. Multi-objective optimization of thermal and exergy efficiencies are then done by using Genetic Algorithm (GA) for each studied system. As a result, Furnace in incineration system and Combustion Chamber in landfill system have the most exergy destruction rate. Also, optimization results show that thermal and exergy effectiveness for landfill system are improved by 7.01% and 6.53% respectively; these values for incineration system are calculated to be 45.35% and 92.75% respectively.
Highlights
An evolutionary of the primary and second laws of the thermodynamic was carried out for a 14.25 MW cogeneration system, in Turkey
Two waste to energy systems: a landfill plant, which is fed by landfill gas (LFG) (Landfill Gas), including a gas turbine associated with a heat recovery unit and a combined heat and power (CHP) incineration plant are investigated from the standpoints of energy, exergy and environmentally based on the Varamin, Iran data in order to designate the best system efficiently and environmentally
Energy recovery from the landfill can contribute to decreasing fossil fuel resources usage [26].The production of electricity and heat in the landfill system are compared with the electricity and heat emission factor in Iran's gas turbine power plants that are fed by natural gas
Summary
An evolutionary of the primary and second laws of the thermodynamic was carried out for a 14.25 MW cogeneration system, in Turkey. Two waste to energy systems: a landfill plant, which is fed by LFG (Landfill Gas), including a gas turbine associated with a heat recovery unit and a CHP incineration plant are investigated from the standpoints of energy, exergy and environmentally based on the Varamin, Iran data in order to designate the best system efficiently and environmentally. For this purpose, the thermodynamic and exergy efficiencies and total GHG emissions are calculated by utilizing mass, energy and exergy balances to each system using EES software [20]. Both systems are optimized to maximize the thermal and exergy efficiencies simultaneously employing genetic algorithm programming using MATLAB software [21]
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