Thermodynamic optimization of an integrated gas turbine cycle, heat exchanger and organic rankine cycle for co-generation of mechanical power and heating load.

Al-Tameemi, Mohammed Ridha Jawad; Yahya, Samir; Hafedh, Saadoon Abdul; AZZAWI, Itimad D. J.

doi:10.22061/jcarme.2023.9366.2253

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	Thermodynamic optimization of an integrated gas turbine cycle, heat exchanger and organic rankine cycle for co-generation of mechanical power and heating load.
Journal of Computational & Applied Research in Mechanical Engineering (JCARME)
مقالات آماده انتشار، پذیرفته شده، انتشار آنلاین از تاریخ 05 اردیبهشت 1402 اصل مقاله (431.62 K)
نوع مقاله: Research Paper
شناسه دیجیتال (DOI): 10.22061/jcarme.2023.9366.2253
نویسندگان
Mohammed Ridha Jawad Al-Tameemi^* ؛ Samir Yahya؛ Saadoon Abdul Hafedh؛ Itimad D. J. AZZAWI
Department of Mechanical Engineering, University of Diyala, Baquba 32001, Iraq
تاریخ دریافت: 27 مهر 1401، تاریخ بازنگری: 04 اردیبهشت 1402، تاریخ پذیرش: 05 اردیبهشت 1402
چکیده
A thermodynamic evaluation has been conducted on a combined heat and power system integrating a gas turbine (GT), a heat exchanger (HX1) and an organic Rankine cycle ORC. Traditionally, ORC bottoming GT cycle is limited to mechanical power production. The novelty of this study is to recover wasted heat from the GT cycle in multistage, which is used for the simultaneous production of mechanical power and hot water supply. In the first stage, the HX1 recovers heat from the GT cycle compressed air to heat the water stream. In the second stage, the ORC cycle recovers thermal energy from the GT turbine exhaust stream to produce extra mechanical power with the remaining latent heat used to heat the water. Two models have been proposed for comparison using ASPEN Plus software linked with the RAFPROP database. The modelled GT in this study has been adopted from an actual machine. The steady-state results show that the combined system has achieved 51.55% thermal efficiency compared with a standalone GT efficiency of 21% only. The thermal efficiency is divided into 24% mechanical power and 27.55% thermal load. The output hot water temperature is 65 oC. The outcomes of increasing the GT pressure ratio (12-25) are higher combined cycle net power output by up to 16% with a 9.5% reduction in the thermal energy rejected to the environment. Also, the GT efficiency increases from 20-22.5%; however, the final water temperature has declined from 67 to 60 oC, which is still appropriate for various heating applications.
کلیدواژه‌ها
Combined؛ ORC؛ Brayton؛ hot؛ water

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Thermodynamic optimization of an integrated gas turbine cycle, heat exchanger and organic rankine cycle for co-generation of mechanical power and heating load.