Pha Lai power station
With its population of 80 million, Vietnam is the world’s 12th most populated country. In the past decade, Vietnam’s demand for electricity has grown by more than 10% per year and this development has created a need for new, efficient power stations. One of the largest new stations is Pha Lai 2, which is located 65 km north east of the capital Hanoi.
Pha Lai 2 Power Station will be owned and operated by Electricity of Vietnam (EVN). The station will consist of two coal fired units. Each unit has a capacity of 300 MWe, which will make Pha Lai 2 the largest coal fired station in Vietnam. The construction of Pha Lai 2 was awarded to an international consortium of Sumitomo Corporation (Japan), Stone & Webster (USA), Mitsui Babcock (UK) and Hyundai Engineering & Construction (Korea).
The Pha Lai 2 site is located near a number of large coal fields and the new power station has been designed specifically for the use of this local anthracite coal. The coal for Pha Lai 2 can be characterized as very difficult; it has an ash content of 27 – 33 % and a volatile matter content of less than 5 %.
The sulphur content in the coal is low, at 0,5 – 0,7 %, but nevertheless, a modern flue gas desulphurization (FGD) plant is included for each of the two units. In these FGD plants, 85 % of the flue gas coming from the electrostatic precipitators will be treated in wet limestone absorbers with 90 % SO₂ removal efficiency. The remaining 15 % of the gas stream is bypassed around the FGD absorbers and mixed with the treated gas stream. After the mixing of the two gas streams in a mixing chamber, a gas stream with an average temperature of 58 °C is released to the chimney.
The chimney of Pha Lai 2 is a 200m high reinforced concrete chimney with two 4,5 m diameter steel flues. In order to provide reliable corrosion protection, the PennguardTM Block Lining System was installed on the internal surface of both flues (5.400 m²).