Basic Plant Operation

During the first week of industrial training, we had went through the basic operation of the plant. From the input resource (natural gas) until the production (electrical power),this proses is done by a power plant system from SIEMENS v94.2.

GAS TURBINE PLANT:



Natural gas are feed into the gas turbine to generate the first stage power where te rated ISO-power is 150 MW. The siemens V94.2 gas turbine generator are single shaft, single casing and heavy duty design.


HEAT RECOVERY STEAM GENERATOR (HRSG):



For combine cycle system design, the heat produce in the gas turbine is not wasted, where it is used to heat up water to superheated steam to supply it to the second generation stage, steam turbine generation.


STEAM, FEEDWATER AND CONDENSATE PLANT



The drum of each HRSG is supplied with feedwater from the feedwater tank by means of HP feedwater pumps. This feedwater will go through four stage of heating process, they are preheater, economizer, evaporator and superheater.
The superheated steam produce will be sent to the steam turbine via the main steam piping system.

STEAM TURBINE GENERATOR



The steam turbine is designed as a single-casing, axial-flow reaction condensing turbine. When it was supplied with superheated steam, power will be generated. Later, the superheated steam will release its energy and back to steam, and this steam will be cooled down by seawater and recycle back to the boiler stack to heat up again.

Above are the discussion of the basic operation of YTL power plant. The power produce in both gas turbine generator and steam turbine generator, will be gathered and send to TNB for further distribution.