Page 17 - Impiantistica Industriale

Cogen Project

in Singapore

Successful modularisation and project execution

Stefano Occhetta, Amec Foster Wheeler

Cogen Project

The objective of the Cogen Project (CP) is
to provide new combined power and ste-
am generation facilities to improve energy
efficiency and improve overall site com-
petitiveness. The new facilities will help
the site create and capture efficiencies
associated with generating power onsite
to offset import from the public utility grid
and shutting down existing utility boilers.
Amec Foster Wheeler’s scope is to design
and build the Cogen plant to produce po-
wer and steam for site consumption and
export via a new 66 kV (kilovolt) substa-
tion. The CP scope is predominately lo-
cated on brownfield sites and consists of:
3D rendering of Cogen 1 and Cogen 2 Power Islands
• Two power islands including:
- Two gas turbine generators
Introduction - One modularised high voltage substation
-
Two modularised heat recovery steam
Brownfield cogeneration plants which are integrat- generators
ed with process plants, are typically field erected - Two natural gas compressors
projects, where modularisation is limited to the - One cooling tower
delivery of some pre-assembled pressure parts of - 16 modularised piperacks (PAR (pre-
Heat Recovery Steam Generators (HRSG) and skid assembled racks)/PAU (pre-assembled
mounted equipment. One reason is that the cost of units).
modular units like HRSG, typically ordered together • New import facilities to supply the site with na-
with other long lead items during FEED (front end tural gas
engineering design), is generally higher than field • Modification to the existing utility boilers, ste-
erected units since modules are designed to with- am load shedding on existing process and
stand the rigors of shipping and require more struc- utility systems, interconnecting piping, modi-
tural steel. Another reason is that the balance of fications to E&I (electrical & instrumentation)
plant is heavily dependent on vendor information, systems.
thus limiting the opportunities for pre-assembled • Civil and underground works have been mas-
piperacks and substations once the EPC (Engi- sive:
neering, Procurement, Construction) is sanctioned. - 600 piles
This article outlines the success story of a cogene- - 25,000 m3 of soil excavated largely by
ration project Amec Foster Wheeler has designed hand in presence of several underground
and built with a full modularised approach. known and unknown assets in service

Impiantistica Italiana - Settembre-Ottobre 2017 15