Plants: Performance & Enhancement”
Four power plants with a total installed capacity of over 2000
MW are owned by one of Bahrain's largest power producing companies.
One of the power plants uses a mixed cycle with five gas turbines
and one steam turbine. They recently upgraded the steam turbine
unit by installing a new feedwater heater, and they want to explore
how it affects the thermal efficiency of the entire plant. The
steam turbine was last upgraded a decade ago, and the manager must
present the new steam turbine system and demonstrate that the plant
update was successful with all relevant information.
1. You must analyze and enhance the existing power plant by
adding feedwater pumps and feedwater heaters
The following information was provided by the responsible
engineer of that power plant regarding the steam cycle part: 𝒎𝟏 ̇
tonnes per hour of superheated steam enters the high-pressure
turbine at 𝑻𝟏 oC and 𝑷𝟏 Bar, and is discharged isentropically until
the pressure reaches 𝑷𝟐 Bar. After exiting the high-pressure
turbine, 𝒎𝟐 ̇ tonnes per hour of steam is extracted to the open
feedwater heater, and the remaining steam flows to the low-pressure
turbine, where it expands to 𝑷𝟑 Bar. At the condenser, the steam is
totally condensed. The temperature at the condenser's outflow is
the same as the saturation temperature at the same pressure. The
liquid is compressed to 𝑷𝟐 Bar after passing through the condenser
and then allowed to flow through the mixing preheater (a heat
exchanger with efficiency 𝜼)where it is completely condensed. The
preheated feed water will be fed into the heat exchanger through a
second feed pump, where it will be heated and superheated to a
temperature of 𝑻𝟏 oC. In the winter, the overall process heating
demand is assumed to be 𝑸̇ MW while this power plant's electricity
demand is 𝑬̇ MW.
- Homework On Cogeneration Power Plants Performance Enhancement Four Power Plants With A Total Installed Capacity Of 1 (4.65 KiB) Viewed 14 times