Natural Gas Power For Natural Gas Production : Wärtsilä to deliver 25 MW power plant for natural gas processing plant in Canada by amanda m. klemp
Wärtsilä will supply a power plant for the Cabin Gas Plant Project in British Columbia, Canada. The power plant is being constructed to provide electricity to the natural gas processing plant producing pipeline-quality gas from shale formations located in the Horn River Basin.
The remote location near Canada’s British Columbia and Northwest Territories border means no utility grid power is available for the gas processing and compression plant. The Wärtsilä engines will run on natural gas produced at the gas processing plant to generate the needed electricity.
Three Wärtsilä 20V34SG gas engine generator sets will produce a combined output of more than 25 MW. Each gen-set has an output of 8.493 MW with a heat rate of 8123 kJ/kWh LHV and an efficiency of 46.6%. The engines themselves are rated at 8700 kW (mechanical) at 720 r/min. The units are designed to operate in parallel or individually.
The 20-cylinder, four-stroke engines are turbocharged and intercooled and also feature a 12:1 compression ratio and an embedded engine control system that controls the combustion process individually in each cylinder. The cylinder bore is 340 mm and the stroke is 400 mm. To lubricate the engine’s moving parts and cool the piston tops, an engine-driven lubricating oil system is integrated in the engine design. It comprises a pressure regulating valve, oil cooler, thermostatic valve, automatic back-flushing fine filter with integrated safety filter, and a centrifugal filter to clean the back-flushing oil from the automatic filter.
Wärtsilä will also supply the AVK alternators, which offer apparent power of 10 549 kVA with nominal voltage of 13 800 V at 440 Amps and 60 Hz. The alternators are driven by the engines
through a flexible coupling, designed to minimize torsional vibration. Also to reduce vibration and structure borne noise, the gen-set will be flexibly mounted to a concrete foundation and auxiliary systems, and therefore isolated from the building, piping and steel structures.
The cooling water system is a closed-loop design and will operate on a mixture of water and glycol, which was formulated for the cold temperatures in northern Canada. The system design also allows the possible recovery of heat from the cooling system, which would increase the overall plant efficiency. Because the radiator works in a closed-loop system, no process water is needed. Each generating set unit is 12.8 m long, 3.1 m wide and 4.4 m high. The generator sets are scheduled for delivery in the third quarter of 2011 and the gas plant is scheduled to be operational in the fall of 2012. A