| Author | Hussain, Shabbir |
| Call Number | AIT Thesis no. ET-91-5 |
| Subject(s) | Gas-turbine power-plants
|
| Note | A thesis submitted in partial fulfillment of the requirements
for the degree of Master of Engineering, School of Environment, Resources and Development |
| Publisher | Asian Institute of Technology |
| Abstract | As d e pende nce on older plants in an electric u tility
increases, utilities must address t he problems of aging, leading
to poorer effici ency , derated capacity, decreased availability ,
and higher required reserve margins. It is far more economical
to extend the life and increase the output of the older power
plants than it is to retire them.
This study is focused on the approach to power plant
upgrading, through conversion of existing gas turbine power
plants to combined cycle, a nd incorporating new technologies to
increase the output and efficiency. First, i t discusses the
overall power system of WAPDA and the c urrent situation of
generating capability shortages and the need to repower its
older power plants. Next, it revi e ws the different typ es of
combined cycle arrangements. A mod el is presented f or
evaluating the techno- economic feasibility of conversion of
existing gas turbine power plants to combined cycle operation .
In addition , this study can help utilities achieve a
focused approach to gas turbine power plant upgrading. It
discusses the reasons why unit upgrading is an increasingly
attractive alternative and it also reviews t he upgrade programs
applicable to t h e gas turbines and their benefits. Furthermore,
two generating capacity expansion options are compared with the
proposed conversion on annual costs basis in order to identify
the relative merits of each alternative.
The results of the study show that by converting the
existing gas turbines to combined cycle, about 50% of the gas
turbine output can be added without any f urther fuel
consumption. The economic analysis for the conversion of an
existing 200 MW gas turbine in WAPDA power system reveals that
the investment yields an IRR of 35% with a PBP of 2 years only.
The proposed conversion will help to save a sum of $18.5 million
per year by recovering the energy which would have bee n
otherwise wasted to the atmosphere .
Comparison with other generating capac ity expansion options
show the attractiveness of the proposed conversion to combined
cycle. With a $780/kW of installation cost, it is not only tho
least cost generating capacity expansion alternative but also is
the option with the least lead time.
WAPDA, facing a deficit of 1680 MW generating capacity in
1990, have a potential of 680 MW through combined cycle
conversion, should opt for t his alternative and all t h e possible
candidate gas turbine plants should be studied to harness this
cheap source of power generation. |
| Year | 1991 |
| Type | Thesis |
| School | School of Environment, Resources, and Development (SERD) |
| Department | Other Field of Studies (No Department) |
| Academic Program/FoS | Energy Technology (ET) |
| Chairperson(s) | Bo, Khin
|
| Examination Committee(s) | Bhattacharya, Sribas C. ;Prida Wibulswas
|
| Scholarship Donor(s) | DAAD (Federal Republic of
Germany) |
| Degree | Thesis (M.Eng.) - Asian Institute of Technology, 1991 |