| Author | Dechadule Thavornkit |
| Call Number | AIT RSPR no. ET-87-22 |
| Subject(s) | Cogeneration of electric power and heat
|
| Note | A research study (9 credits) 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 | The palm oil industry, being a fairly new industry in
Thailand, has not been the subject of any previous energy study.
The study was limited to the normal operation of the cogeneration
and electrical system of a palm oil mill plant. An energy audit
was conducted and first and second law thermodynamic analysis
were made. The results show that the cogeneration system first
law efficiency is on average about 28.3% and the second law
efficiency is about 9.2%. The heat to power ratio of the system
is on average about 12 during off peak periods and 8.1 during on
peak periods. The analysjs showed that the low efficiency of the
system is due to the large difference between the steam
requirement to generate electricity and process steam needs
resulting in excessive steam blowout, as well as, low boiler and
turbine efficiencies.
The boiler first l aw efficiency is on average equal to 52.3%
and the turbine efficiency is 50.5%. The results pin-pointed high
moisture content in the fuel, high flue gas temperature and too
much excess air as the main cause of low boiler efficiency, and
steam throttling as the major cause of low turbine efficiency.
The heat to power ratio is quite low during on peak periods, i .e.
when the KO plant , which is a relatively new addition, is
likewise operating, emphasizing the fact that the plant has
evolved into a system requiring a large amount of electrical
energy compared to thermal energy.
Modeling equation for the boiler and turbogenerator were set
up . Simulation of the cogeneration system was also attempted The
modeling equations and simulation were found to agree fairly well
with available test data.
Energy conservation measures towards recovering some of the
excess steam and improvements in the electrical system to reduce
electrical load were analyzed. The results s how that a potential
total saving of 944,000 Baht/year which is 20% of total 1986
energy cost of the factory may be achieved. The proposed
implementable measures arc: utilization of excess steam to
preheat the pressurized boiler feedwater and nonutilization of
the generator capacitor when cogenerating electricity. |
| Year | 1987 |
| Type | Research Study Project Report (RSPR) |
| School | School of Environment, Resources, and Development (SERD) |
| Department | Other Field of Studies (No Department) |
| Academic Program/FoS | Energy Technology (ET) |
| Chairperson(s) | Prida Wibulswas ;Bhattacharya, Sribas C. ;
|
| Examination Committee(s) | Lucas, N.J.D. |
| Scholarship Donor(s) | SHELL/UNESCO |
| Degree | Research Studies Project Report (M. Eng..) - Asian Institute of Technology, 1987 |