Abstract
The global energy matrix is going to embrace more and more renewable-based combined energy systems. Therefore, multi-generation energy systems, like CHPs (combined heat and power) could be extremely beneficial for such integrated energy systems. Also, the trend is toward 100% sustainable production where both renewable and waste energy sources are of special value. Especially, in Europe, waste incineration has received special attention over the past decades, as not only it is a smart method of waste disposal, but also a measure of cheap and environmentally friendly energy production. This study proposes a municipal waste-driven tri-generation (cold, heat, and power) system and assesses how this solution helps for easier integration of energy sectors and having a more sustainable chain of energy supply. Then, the solution is comprehensively analyzed over thorough thermodynamic, thermoeconomic, and thermoenvironmental investigations. The results of the assessments show that the proposed trigeneration system may effectively operate in any energy systems with simultaneous cold, heat, and power demands. Thermal, exergetic, fuel-to-power, fuel-to-heat, and fuel-to-cold efficiencies are found to be 83.28, 25.69, 23.49, 47.41, and 12.38%, respectively, while the payback period of 6 years is obtained based on the net present method.
Highlights
Co-generation and tri-generation systems are proved to be smart tools for increasing energy and cost efficiency of supply via the recovery of an energy flow which is otherwise wasted [1].Apart from this fact, the importance of such multi-generation plants is increasing today because of the growing need for integrated energy systems where all the energy demands such as electricity, cold, and heat have synergies with each other [2]
The thermal behavior of the whole system and employed components are evaluated in detail and thermodynamic equations are applied for each unit, separately, including mass balance and energy conservation
Proposed municipal waste-driven CCHP is simulated via developing a computer program utilizing EES
Summary
Co-generation and tri-generation systems are proved to be smart tools for increasing energy and cost efficiency of supply via the recovery of an energy flow (mainly heat) which is otherwise wasted [1]. Owebor et al [8] designed an integrated thermal power plant operating with municipal waste to energy This system was a combination of gasifier, fuel cell, steam and gas turbine power cycles, ORC, and an absorption chiller. While the present study digs into the very detailed thermodynamics (rates of exergy and energy losses and flows, the costs associated with these losses, etc.), economic, and environmental (such as CO2 and NOx emission levels) aspects of the system. This information is informative and essential to know for novel energy systems when are proposed for real-life applications. Relying on the driven results from the simulations, suggestions are given for improving the performance of the system to increase the technical, economic, and environmental effects of the plant
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