Material Balance Mghr

Mass In

Fuel (as received) 77.1

Ammonia 0.1

Combustion Air 273.1

Total 350.3

Mass Out

Fuel prep moisture losses 34.6

Fines 0.0

Ferrous metal 0.0

Bottom ash 0.1

Fly ash 0.5

Flue gas 315.0

Total 350.3

Figure 3. Material and energy balance for the year 2000 case.

excess air used in the combustion process, and the amount of heat lost in the heat transfer process, which is largely a function of boiler design." If we multiply the McNeil Station design efficiency by 83/70, we get 27.3% efficiency .

In 2020, plant efficiency is increased to 33.9% [1] through more severe steam turbine cycle conditions possible at larger scale, e.g., higher pressure, higher temperature, and reheat. For example, Wiltsee and Hughes [1] provide an example of a 50 MW stoker plant, compared to a 100 MW WTE™plant and state "As shown, the WTE™steam turbin e (7,874 Btu/kWh) is much more efficient than the stoker power plant's steam turbine (9,700 Btu/kWh). This is because of the WTETNsteam turbine' s larger size (106 vs. 59 gross MW), and higher steam conditions (2,520 psig and 1,000 °F with 1,000°F reheat, vs. 1,250 psig and 950°F, with no reheat)." If one multiplies the 27.7% efficiency case by the ratio 9,700/7,864, one gets 34.1%, which is comparable to the Biopower model results of 33.9%.

Renewable Energy 101

Renewable Energy 101

Renewable energy is energy that is generated from sunlight, rain, tides, geothermal heat and wind. These sources are naturally and constantly replenished, which is why they are deemed as renewable. The usage of renewable energy sources is very important when considering the sustainability of the existing energy usage of the world. While there is currently an abundance of non-renewable energy sources, such as nuclear fuels, these energy sources are depleting. In addition to being a non-renewable supply, the non-renewable energy sources release emissions into the air, which has an adverse effect on the environment.

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