Monday, June 9, 2008

Sultan Ismail Power Station Paka

Sultan Ismail Power Station Paka

Date of Issue: 1988-04-04
Denominations: 20 cents, $1.00
Stamp Size: 28 mm x 38 mm
Paper: SPM watermarked Phosphor coated
Printing Process: Lithography
Printer: Security Printers (M) Sdn. Bhd. Petaling Jaya, Malaysia
Sheet Composition: 100 stamps
Designer: Azmi b. Kassim

Stamps in the Series:

First Day Cover:

The Sultan Ismail Power Station in Paka, Dungun, Terengganu, Darul-Iman costing approximately $870 million is the first plant constructed by the National Electricity Board which uses natural gas as its primary fuel. Located on a 87.4 hectare site this station, with a total nominal capacity of 900 MW, is the largest combined cycle power station in the ASEAN region.

The first phase of this development comprises the installation of the three blocks of combined cycle power plant each nominally rated at 300 MW. Each block comprises two 100 MW gas turbine units, two heat recovery boilers and one 100 MW steam turbine unit.

In the combined cycle concept, the combustion of gas in the gas turbine generator produces about one third of the fuel energy input. The remaining energy is released to the waste heat recover boiler which produces steam to drive the turbine generator thereby producing an extra output of about half that of the two gas turbines.

The combined cycle power plant therefore has a much better fuel efficiency than a conventional power plant with the same capacity. In the case of the Sultan Ismail Power Station, an overall block efficiency of approximately 46% can be achieved the highest efficiency obtainable in any of the National Electricity Boards generating stations. The gas turbines can also be operated on an open cycle mode through a system of bypass stack and dampers.

The cooling water comprises a pumphouse located at the shoreline. Six circulation water pumps are installed in a dry pit pumphouse. Sea water for cooling purposes is supplied by two submarine reinforced concrete pipes measuring 650 meters long in diameter and discharged through twin off-shore pipes measuring 350 meters long and 2.1 meter in diameter.

To meet the stringent response in power demand and operational requirements of the generating system, a high level of sophistication in the control and in the instrumentation employing the latest technology have been installed. Remote supervision of the system is centralized in a Central Control Building. However, the gas turbines can also be operated from their respective local controls.

The generated output voltages at the gas and steam turbine generators are at 11.5kV and 12kV respectively. These voltages are stepped up to 275kV for transmission into the National Grid through a substation network comprising the 132kV and the 275kV substations. The 132kV substations are linked by two 180 MWA interbus transformers for connection to the National Grid.

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