Abstract
Growing concerns of environmentalists have led the researchers to improve the performance of the gas turbines by reducing its carbon
footprints. Besides increasing the turbine inlet temperature and pressure ratio of the gas turbine, one suitable way is to recover the
exhaust heat from gas turbine using a waste heat recovery unit or units and employ it to produce useful power with the help of
bottoming power cycles. Available steam Rankine bottoming and organic Rankine cycles are not suitable for small power plants (i.e.
less than 50MWe); therefore, air bottoming cycle (ABC) is a viable option to be used as a waste-heat system of gas turbine cycle. In
this work, we carried out a thermodynamic optimization of an ABC having a gas turbine in topping cycle. Energy analysis is used for
this thermodynamic analysis. The component wise methodology is adopted, and sensitivity analysis is carried out to find the
maximum thermal efficiency point of the ABC. The sensitivity study is conducted by varying mass flow rate ratio, pressure ratio, and
effectiveness of integrated heat exchanger (IHX). It is observed that the increasing the mass flow rate of the bottoming cycle have
adverse influence on performance parameters (efficiency and work output). After optimization, it is concluded that using ABC
configuration, the overall plant efficiency is increased to ~43% as compared to simple topping cycle.
footprints. Besides increasing the turbine inlet temperature and pressure ratio of the gas turbine, one suitable way is to recover the
exhaust heat from gas turbine using a waste heat recovery unit or units and employ it to produce useful power with the help of
bottoming power cycles. Available steam Rankine bottoming and organic Rankine cycles are not suitable for small power plants (i.e.
less than 50MWe); therefore, air bottoming cycle (ABC) is a viable option to be used as a waste-heat system of gas turbine cycle. In
this work, we carried out a thermodynamic optimization of an ABC having a gas turbine in topping cycle. Energy analysis is used for
this thermodynamic analysis. The component wise methodology is adopted, and sensitivity analysis is carried out to find the
maximum thermal efficiency point of the ABC. The sensitivity study is conducted by varying mass flow rate ratio, pressure ratio, and
effectiveness of integrated heat exchanger (IHX). It is observed that the increasing the mass flow rate of the bottoming cycle have
adverse influence on performance parameters (efficiency and work output). After optimization, it is concluded that using ABC
configuration, the overall plant efficiency is increased to ~43% as compared to simple topping cycle.
| Original language | English |
|---|---|
| Title of host publication | Second International Conference on Energy Systems for Sustainable Development (ESSD-2018) |
| Publisher | COMSATS Institute of Information Technology |
| Pages | 59-62 |
| Publication status | Published - 23 Feb 2018 |
| Externally published | Yes |
| Event | 2nd International Conference on Energy Systems for Sustainable Development - COMSATS INSTITUTE OF INFORMATION TECHNOLOGY, Lahore, Pakistan Duration: 21 Feb 2018 → 23 Feb 2018 |
Conference
| Conference | 2nd International Conference on Energy Systems for Sustainable Development |
|---|---|
| Abbreviated title | ESSD- 2018 |
| Country/Territory | Pakistan |
| City | Lahore |
| Period | 21/02/18 → 23/02/18 |