TJ548 : Technical and economical analysis of a combined cooling, heating and power (CCHP) system by gas turbine prime mover with hydrogen production cycle
Thesis > Central Library of Shahrood University > Mechanical Engineering > MSc > 2018
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Abstarct: Environmental degradation is a major threat to the world today. Pollutants from power plants and combustion devices and toxic gases arising from various chemicals, including refrigerants, are believed to be the causes of the global warming potential and ozone depletion potential. Two strategies can be implemented to reduce the dependence on fossil fuels. The first strategy is baxsed on reducing energy consumption and increasing energy efficiency in industrial and domestic fields which combined cooling heating and power (CCHP) systems provide that, and the second one is to increase the contribution of renewable energy resources to global energy consumption.
A novel arrangement of a polygeneration system, integrating a CCHP system and a hydrogen production unit is introduced and analyzed in this paper. The polygeneration system consists of a gas turbine as the prime mover, a high pressure steam production unit, a hydrogen production unit, and an absorption refrigeration chiller. The simulation and performance analysis of the proposed system is done with Aspen Plus software. Moreover, energy and economic analysis are investigated for the system. Also an optimization is done by maximizing the economical profit function. Selecting and Setting up the productions due to the needs, using the energy of initial fuel as maximum as possible, avoiding energy and funding profusion and developing the efficiency by using heat exchangers and the ability of deployment of various equipment, ordering and methods are some of the highlights of the system.
The results illustrate that the energy efficiency of the polygeneration system is 55.28% which shows an increment of 75.82% than the single gas turbine power plant where the profit of the system is 79 million dollars per year. Also, the economic evaluation shows a payback period of less than one year. Additionally, the effects of the operating parameters like ammonia mass fraction of the absorption chiller and the steam to methane ratio of the hydrogen production cycle on performance of the polygeneration system is studied. The results show that increasing the ammonia mass fraction leads to the increment of cooling capacity and consequently the total efficiency of the system. It is also concluded that produced hydrogen mass flow rate has a direct relationship with steam to methane ratio.
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