Viridor, Energy from Waste Bolton
This was essentially a new build project of an Energy from Waste (EfW) plant commissioned by Greater Manchester Waste (GMW). The objective was to enable GMW to meet its waste management obligations in the most effective manner and against environmental pressures to reduce landfill activity and dispose of waste in an efficient and environmentally friendly manner.
How we helped
The system is based on Wonderware’s InTouch 7.0 for Factory Suite 2000 to provide the SCADA system and Allen Bradley PLCs and SLCs to provide plant/process control and monitoring. The SCADA system runs on two operator workstations. A third workstation, the engineering workstation, is used primarily to make changes to the SCADA and PLC systems.
The engineering workstation contains the following software:
- A development and run-time licence for InTouch 7.0 to allow changes to InTouch
- Allen Bradley’s RSLogix 5 and RSLogix 500 to allow changes to the PLC and SLC systems
These packages also run under Microsoft Windows and can operate concurrently. The engineering workstation, when not being used for engineering purposes,may be used as a third operator workstation.
Each of the two hubs facilitate up to four fibre connections to the PLCs.
A network of PLC systems provides the processing power necessary for the plant control requirements, device manual control, auto sequence control, modulating loop control and alarm detection. Communications between the operator workstations and the PLCs is via Ethernet.
A 10 Base-2 coaxial cable extends along the operator desk, across the control room to the main PLC cubicle and is terminated at the Ethernet.
The Main PLC is a hot standby system and is located in a cubicle within the control room, the Power Distribution SLC is located on the upper level of the turbine hall and the remaining SLCs are distributed locally to their associated plant. The PLC, SLC and local control panels were built and installed by Capula to Alstom’s specification.
Alstom also provided specifications from which the majority of the PLC/SLC software and Intouch screens were written. The control software which runs in the PLC systems comprises a complex arrangement of sequencing, interlocking, and closed loop modulating controls to automatically control the furnace, boiler, feedwater, flue b gas treatment and balance of plant areas.
Sophisticated control algorithms ensure that the plant and process is controlled efficiently within tight parameters.
The Turbine Control System was provided by the turbine manufacturer and is interfaced to via hard-wired I/O interface. Work began in 1999 with the systems tested during 1999 and installed at site in early 2000. The main commissioning phase took place through Q1 to Q3 2000.