Current Research & outlook on future developments
of the plant
The first phase of the power plant involves no generation
of electricity. Electrical power for operating the plant is initially bought
from the National Power Company at a favorable price. Power station I,
second phase, will involve electricity generation for the plant's own need.
A steam turbine of 8 MWe will be installed. The second
phase is planned to be in full operation in 1993.
A second steam turbine is planned for phase 3. It will produce electricity
from all the steam that is needed for the heating process. The total generation
of electricity will then be 36 MWe (steam turbine 1 included). The pressure
in the turbines is estimated to drop from 15 to 2 bara. However the electricity
production could be increased to 43 MWe by lowering the back pressure to
1.2 bara. This requires a considerable increase in the surface area of
the steam heat exchangers. Steam turbine 1 (8 MWe) will be a single-stage
back pressure turbine with relatively low efficiency, whereas steam turbine
2 (30-37 MWe) will be a multistage turbine with much higher efficiency.
The character of the process will change considerably with power station
II as wells with much lower enthalpy will be connected to the plant. The
plan is to install a condensing steam turbine. The inlet pressure will
be 8 bara and condenser pressure 0.1 bara. The total electricity generation
is expected to be 46 MWe.
The steam is condensed in an indirect condenser at a temperature of 46°C
and the condensate rejected with the waste water. The condensation heat
is utilized to heat up cold ground water. After that the FBHX's are used
for heating it up to 88°C before it enters the deaerators. The FBHX
play an important role in power station II, as they contribute about 43%
to the heating process, due to the great amount of separated water.
second
phase is planned to be in full operation in 1993.