A novel arrangement of a poly-generation system, integrating a combined cooling heating and power (CCHP) system and a hydrogen production unit is introduced and analyzed in this article. The polygeneration system comprises of a gas turbine as the prime mover, a high pressure steam generation unit, a hydrogen production unit and an absorption refrigeration chiller. The simulation and operation analysis of the proposed system is done with Aspen Plus software. Moreover, economic and energy analyses are investigated for the system. Also an optimization is done by the economical profit function as the objective function. The results show that the energy efficiency of the poly-generation system is 55.28% which indicates an increment of 75.82% than the single gas turbine power plant while it earns 79 million dollars per year as profit. Also, the economic evaluation shows a payback period of <1 year. Additionally, sensitivity analysis is conducted by analyzing the influences 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 poly-generation system. The results show that increasing the ammonia mass fraction leads to 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 and more hydrogen is produced at higher ratios that leads to increment of the system total efficiency where increasing the ratio from 1 to 3.5 increases the produced hydrogen and total efficiency of the system 115 and 127%, respectively. Optimization shows that, it is more beneficial to have the minimum cooling capacity and increase the hydrogen production to maximize the profit. It also indicates that the profit function at first increases by reducing the reformer temperature but after while decreases due to the greater increment of total capital and operational costs than income. For instance, reducing the reformer temperature from 510 to 500°C increases the total capital and operational costs ~29%.
کلید واژگان :poly-generation system; economical analysis; optimization; hydrogen production unit
ارزش ریالی : 600000 ریال
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