1. A dry refuse derived fuel contains 50% rubber, 10% ferrous metals, and 40% dirt (by weight). Approximately, what is the heat value of the waste stream?
3900 Btu/lb
6200 Btu/lb
7800 Btu/lb
13,300 Btu/lb
2. 20 gram sample of refuse derived fuel has a heat capacity of 13,000 cal/°C and a heat value of 2800 cal/g. What temperature rise is expected when the sample is combusted in a calorimeter?
0.00028 °C
0.23 °C
4.3 ° C
3.8x1011 ° C
3.__________ is expressed in common units and is pictured as quantity that flows.
Water
Energy
Gas
Steam
4. What is an energy balance for heat energy in terms of the conversion of water to steam?
Heat energy = height of material X absolute temperature of the material
Heat energy = mass of material X absolute temperature of the material
Mass of material = heat energy X absolute temperature of the material
Mass of material = height of material X heat energy
5. A refuse derived fuel consists of 50% rubber, 10% ferrous metals, and 40% dirt on a wet weight basis. Approximately, what is the heat value?
197 Btu/lb
6030 Btu/lb
10,700 Btu/lb
13,300 Btu/lb
6. A refuse derived fuel power plant discharges 1.2 m3/s of cooling water at 75°C into a river. The river flows at 23 m3/s, and its temperature is 15° C upstream of the plant. What will be the river temperature immediately downstream of the discharge?
15 ° C
18 ° C
45 °C
75 °C
7. The combustion of fuel such as RDF can have undesirable side effects including all of the following EXCEPT:
waste heat generated by power plants.
the development of ash that requires disposal.
the production of carbon dioxide.
leakage of contaminated water.
8. __________ uses the chemical makeup of fuel in order to approximate its heat value.
Compositional analysis
Ultimate analysis
Regression analysis
Final temperature
9. What is the heat value for a 15 gram sample of refuse-derived fuel that is combusted in a calorimeter having a heat capacity of 10,500 calories/° C? The temperature rise is measured as 7°C.
4900 calories/gram
5600 calories/gram
7400 calories/gram
9300 calories/gram
10. __________ is the method of determining the heat value of mixed fuels.
Final temperature
Ultimate analysis
Calorimetry
Standardized heat
11. How does gasification technology work? What are its advantages and disadvantages?
12. Combustion produces several undesirable effects. Which do you see as the worst, and why?
Worrell, W. A., &Vesilind, P. A. (2012).Solid waste engineering (2nd ed.). Stamford, CT: Cengage Learning.