Rothschild Biomass Cogeneration Plant photo

Rothschild Biomass Cogeneration Plant

1. Biomass fuel storage

The biomass fuel storage building measures 160 feet wide by 435 feet long by 65 feet high and holds around one week of chipped woody biomass fuel for the plant.

2. Truck unloading station

On average, 50 to 75 truckloads of pre-chipped biomass fuel will be delivered to the plant each weekday.

3. Boiler

This circulating fluid bed (CFB) boiler, a high-efficiency, low-emission boiler designed specifically to combust biomass, is housed inside a 190-foot building. The boiler will consume 300,000 to 500,000 tons of biomass annually and is equipped with state-of-the-art air quality control equipment, including a high-efficiency baghouse for particulate control. The boiler’s chimney is approximately 265 feet tall.

4. Turbine and generator

The 155-ton steam turbine is approximately 23 feet long by 21 feet wide by 19 feet high. The 85-ton generator measures 24 feet long by 12 feet wide. In addition to generating 50 megawatts of renewable electricity for We Energies, the new plant will produce all of the steam needed by the Domtar mill to make paper.

5. Substation

This substation increases voltage or “steps up” electricity from 13 kilovolts (kV) to 46 kV after it leaves the power plant for more efficient transportation along the power lines.

6. Baghouse

This state-of-the-art emission control device virtually eliminates particulate matter emissions from the biomass boiler. The baghouse, along with other emission control equipment, reduces overall site emissions by about 30 percent.

7. Cooling tower

The cooling tower provides low-temperature water to the condenser so that steam leaving the turbine can be reused in the boiler. The cooling tower eliminates need for a separate discharge of heated water to the Wisconsin River. The cooling tower is equipped with abatement technology to eliminate visible water vapor plumes.

8. Natural gas auxiliary boiler

To ensure Domtar always has steam for its paper-making process, the biomass plant uses a natural gas auxiliary boiler when the biomass boiler is not operating (i.e., offline for scheduled maintenance or other repairs). This back-up boiler includes a 210-foot chimney.