1. For the tire derived fuel listed below (in mass fraction), calculate the foll
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1. For the tire derived fuel listed below (in mass fraction), calculate the following operating parameters: a) the fuel and air feed rates in kg/s b) the product gas composition assuming exhaust contains only CO2, H2O, O2, SO2, HCl and N2 c) the SO2 emission rate in metric tonnes (1,000 kg) per year if the sulfur dioxide is removed from the flue gases with a mean efficiency of 95% and the average output of the plant is 75% of its rated capacity. d) the CO2 produced per tonne of fuel and per year e) Compare the values in (c) to those of coal calculated from the data listed below. f) Compare the values in (d) to those of coal calculated from the data listed below. The fuel is burned in air at 25% excess air. Electric power is produced at a rate of 500 MW with an overall process efficiency (based on the input heating value of the fuel) of 30%. ULTIMATE ANALYSIS CHARACTERISTIC COAL Tires W/O WIRE CARBON 67.69 72.25 HYDROGEN 4.59 6.74 NITROGEN 1.13 0.36 SULFUR 2.30 1.23 ASH 11.05 8.74 CHLORINE 0.01 0.09 MOISTURE 7.76 1.02 OXYGEN 5.47 9.67 TOTAL 100.00 100.00 The heating values of the coal and tires are 16.2 MJ/kg and 35 MJ/kg, respectively. 3. A mixture contains 1% CO, 20% O2, 1% H2O and the balance is N2 (in mole fraction). At 1200 K and 1 atm, calculate and compare the oxidation rates (moles/cc/s) of CO for the (forward only) reactions 31 and 99 in Table 5.3. Radicals can be assumed to be small in concentration and in equilibrium with the major species. 7. Ventilation exhaust contains air with 500 ppm methanol. The exhaust as it comes out of the process is initially at 1 atm, 25C. The exhaust is evacuated at a rate of 5 m^3/s (at 25C, 1 atm). To oxidize this VOC, the exhaust is quickly heated to 600 K and 1 atm. and fed into a 1.5 m diameter cylindrical thermal oxidizer that is 6 m long. The air stream flows along the cylindrical oxidizer from one end to the other. What is the DRE (destruction and removal efficiency) using the single step reaction rate?Explanation / Answer
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