Singapore generator adds cogeneration to power plant

Singapore’s PowerSeraya has added a cogeneration facility to its original power generation capability in a move towards creating a fully-integrated energy hub. Edward Henry Taylor, Ponnuchamy Veerachamy, Shen Youwang, Shih Chi Lai and Mohd Rafid Bin Ibrahim report on the execution of the project.

Jurong Island in Singapore is the ideal location for PowerSeraya Ltd to pursue its corporate strategy to develop from a pure generator into a fully integrated energy hub. In January 2007 PowerSeraya, with the support of PB Power as the owner’s engineer, embarked on a two phase cogeneration project. In the first phase PowerSeraya’s two existing single-shaft 370 MW Siemens SCC5-4000F combined cycle power (CCP) units were converted to cogeneration, for supplying 130 tonnes/hr of process steam through 2.5 km of high pressure steam pipeline to the end user by 1 September 2009. In the second parallel phase two additional 400 MW Siemens single shaft SCC5-4000F CCP cogeneration units with duct firing capability were installed for commercial operation in mid-2010.

This article will look at some of the key challenges faced during project execution, including the optimal reuse of the plant’s existing facilities and the integration of new equipment. Other aspects of the project covered in this article are the emergency steam dump, venting provisions for safety, steam metering considerations and the dynamic behaviour of the plant when operating in cogeneration mode, when steam is extracted from the multi-unit configuration while connected to the grid.

In mid-2000 PowerSeraya embarked on a corporate strategy of diversifying from its core business of supplying generation to the Singapore Electricity Market as a pure generator to become a fully integrated energy hub. As part of the diversification strategy, PowerSeraya investigated the potential for enhancing the efficiency of its existing power plant assets through their conversion to cogeneration, and for supplying steam to various offtakers in the immediate vicinity of the PowerSeraya site.

Located on Jurong Island, the centre of the Singapore petrochemical industry, PowerSeraya subsequently entered into a steam supply agreement (SSA) with a steam customer on the island. This agreement covers the supply of high-pressure, high-temperature steam and identified potential steam customers for medium and low pressure steam. The Power Division of Parsons Brinckerhoff Pte Ltd (PB Power) was contracted by PowerSeraya as the owner’s engineer for the project.

The Indonesia Today Mobile » PSL Group Enters Indonesia Coal Business

Theindonesiatoday.com – SGX-listed PSL Holdings Limited, a foundation-engineering specialist, which also supplies construction equipment and crawler cranes, has decided to invest in Indonesian coal Mining industry.

The investment will be made through a few arrangements revolving around PSL’s wholly owned subsidiary, PSL Energy resources Pte Ltd. PSL Energy has inked two agreements, namely, an exchangeable loan agreement (ELA) and a fee agreement (FA) with Indonesian businessman, Mr Charles Antonny Melati, in respect of a proposed investment in Sindo Resources Ltd.

Based on the ELA, PSL Energy will grant an exchangeable loan of up to US$2.998 million for the sole purpose of funding Mr Melati’s acquisition of the shares in PT Bubuhan Multi Sejahtera (BMS).

PT Bubuhan Multi Sejahtera is based in Balikpapan, East Kalimantan, having 6 permits for coal mining covering a total area of 9,000ha. One of the permit, covering 195ha, was granted for period of 8 years.

PSL said that BMS has at least 25 million Mt of coal reserve and claimed PSL has receipt of documentary proof that BMS is entitled to mine shall have no less than 10 million Mt.

Incorporated in 1983 in Singapore, PSL Holdings is provider of engineering services such as micro-piling, bored piling as well as soil investigation and slope stabilization works. (bintang@theindonesiatoday.

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