| Author | Chanthip Kanchanachongkol |
| Call Number | AIT Thesis no. ET-91-1 |
| Subject(s) | Cogeneration of electric power and heat
Bangchak Petroleum Refinery
|
| Note | A thesis submitted in partial fulfillment of the requirement for the degree of
Master of engineering, School of Environment, Resources and Development |
| Publisher | Asian Institute of Technology |
| Abstract | Cogeneration system in the energy intensive industries, lil<e petroleum
refineries is particularly attractive as it produce h eat and electricity with high
efficiency. The cogeneration not only conserve the energy, but also help the
utility to meet the electricity demand without expanding its generating capacity
by supplying the surplus electricity to the utility. The increased reliability of
the electric supply as a result of cogeneration is t he most important factor in
favour of cogeneration as t he refinery process need an uninterrupted power
supply.
Technical and economic aspects of cogeneration system in Bangchak
Petroleum Refinery is studied to evaluate t h e feasibility and ·to choose the most
appropriate cogeneration system for t h e two refinery capacities planned for the
next ten years. Technical and economic models are developed for the study .
Prior to the technical and economic evaluation, the energy analysis of the
existing cogeneration system h as been performed in order to collect all
necessary information and assumptions. Various alternative cogeneration systems
are considered and compared on the basis of high and low installed costs and
different utility buy back rates for their technical and economic merits.
For the 120 kbsd refinery capacity, the modification of t h e existing
cogeneration system with high installed cost scenario, is the best alternative
yielding an internal rate of return (IRR) of 30% on the investment and a pay
back period (PBP) of 5. 9 years. The higher in vestment for the new design
cogeneration system is not justified for buy back rates of less than 1.4
Baht/ l<W h. For low installed cost scenario, the new design cogeneration system
yields a higher IRR of 38.25% and a shorter PBP of 4.1 4 years when operated
under electrical match. The other greater size systems of new design options
with surplus electricity for sale, although they are less attractive are still
acceptable for the buy back rates of higher than 1.45 Baht/ kWh.
For 210 kbsd refinery capacity, the expansion of cogeneration system from
120 kbsd gives more economic benefits than the whole new design system. The
best alternative in this case yields an IRR of 36.67% with a PBP of 4.4 years.
The alternatives for maximum cogeneration system to generate surplus
electricity for sale to the utility with the present regulations are not
economically attractive, as the incremental investment for larger size yields
lesser r ate of return as compared to t h at on t he investment for t h e electrical
match cogeneration. However, other benefits achieved from the maximum
cogeneration system are not quantified.
This study covers all the technical and economic aspects of the possible
cogeneration system alternatives at Bangchak Petroleum Refinery for its future
expansion program. However, the selection of the most suitable alternative
depends upon many factors, e .g. available capital for investment, minimum
acceptable rate of return , required payback period, cogeneration regulations, and
etc., which are subjected to the views of the BPR authorities. |
| Year | 1991 |
| Type | Thesis |
| School | School of Environment, Resources, and Development |
| Department | Department of Energy and Climate Change (Former title: Department of Energy, Environment, and Climate Change (DEECC)) |
| Academic Program/FoS | Energy Technology (ET) |
| Chairperson(s) | Prida Wibulswas ;Supachart Chungpaibulpatana; |
| Examination Committee(s) | Bhattacharya, Sribas C. ; |
| Scholarship Donor(s) | Government of Australia ; |
| Degree | Thesis (M.Eng.) - Asian Institute of Technology, 1991 |
