Power Generation - Application Examples:

Steam Turbines - Cogen Timber Mill

The Opportunity:

Most boilers in existing dry kiln facilities are driven by the steam demands of the dry kiln which has two counterproductive effects:

It slows the drying process and damages the boiler creating premature maintenance problems; Cogeneration systems profitably solve this two problems; save energy and reduce carbon emissions with attractive returns on investment.

How it Works:

Dry kiln steam demands are quite variable, a cogeneration system uses a turbine to drive the boiler. The turbine provides steady steam demand for the boiler and when the dry kiln requires heat, steam is immediately available and time is not wasted waiting for the boiler to fire harder to make more steam for the kiln. The dry kiln process remains the primary user for the steam with control valves located throughout the system to dictate where the steam goes.

Steady operating conditions for the boiler is another benefit of cogeneration systems. Boilers are made to run at steady load, cycling a boiler damages the refractory and creates premature maintenance problems.

Many mills had an abundance of wood waste, so the steady operation of the boiler also addresses a material handling issue.

Moreover the electricity generated out of wood waste is considered renewable energy, this electricity will not only reduce the energy costs from the mill but will generate an extra income of around $0.03 per kW based on the trade of the renewable energy certificates that will be issued in favor of the company.