Question

1. Calculate the primary NAAQS concentration limit for 502 in units of ug/m' at standard temperature and pressure (STP:T - 25*C, P = 1 atm). 2. Fuel X9-6000 is 95.8% efficient in an airplane engine. The unburned fuel leaves as VOCS in the exhaust. For each kg of fuel X9-6000 (Molecular Weight, MW-98), the engine exhausts 20 kg of gases (MW = 28 g/mol). What is the fraction of VOCs in the exhaust (ppm)? ncinerator burns 30 tonnes of plastic waste (1 tonne = 1 metric ton = 1,000 kg) per day, exhausting gases at 220 °C and 1 atm. For each kg of feed, 25 kg of gases are exhausted. Assume the exhaust gases contain 19% CO2 and 6% H20, as emitted. Calculate the estimated daily emissions of CO2 and water vapor in units of kg/d. 4. A coal-fired power plant is burning bituminous coal that has an energy content of 12,000 Btu/lb. The power plant is burning the coal at a rate of 110 lb/s. The efficiency of the powerplant is 33%, which means that 67% of the total energy from the coal is lost as waste heat. a. A new heat exchanger is installed that is capable of using 0.12% of the waste heat to heat an air stream for use in another process in the plant. The air enters the heat exchanger at a volumetric flow rate of 2,000 acfm at 298 K and 1 atm. Assuming the heat exchanger is 90% efficient (i.e., 90% of the heat supplied to the heat exchanger is transferred to the air stream), at what temperature will the air leave the heat exchanger, assuming an exit pressure of 1 atm? Use an average specific heat of 0.244 Btu/lb-R. b. What will be the volumetric flow rate of the gas leaving the heat exchan units of acfm)? 6. If the air exiting the heat exchanger has a moisture content of 12% (v/v), what is the moisture-corrected dry flow rate (in units of dry standard cubic meters per minute) at STP (1 atm, 298 K)? 5. A gas stream flowing at 1,000 cfm (cubic feet per minute) with a particulate loading of 400 grains/ft discharges from an industrial plant and then passes through an 80% efficient cyclone. A new law requires that stack emissions must be s 10 lb/hr. The company is considering the installation of a wet scrubber downstream (following) the cyclone. 7,000 grains = 1 lb. 1. February 5, 2020 1 Page a. Determine the minimum required particulate removal efficiency of the wet scrubber to meet the requirements of the new law. b. Determine the total overall system efficiency (including the cyclone and wet scrubber).

Answer 1

Primary Nanas concentration limit for Soz: The Environmental protection Agency (EPA), US established a NAAOS [national Ambient Air Onality standards] for 6 eritoria pollutants. These criteria pollutants are harmful for human health and Envirament Environment. → The pollutants which are harmful for human health are known as "primary standards". » And the pollutants which are harmful for environment are known as "Secondary standards." These primary & Secondary standards are calculated and sevised periodically.

The current standards for coo is given by Primary standards for so, = 75 ppb [ prb Parts per billion] of So measured over - one The concentration hour period. » The 15 pph is the 99th porcentile of 1-hour daily moux imun concentrations, averaged to 3 years The NAAQS concentration limit for so, in temperature and pressure elg / m3 at is given as standard follows, At standard temperature at an'c and I am and pressure i.e. the molar volume is 24.451

and also we know that, men nation (uglm3): Gencentratie opb)x moleuder mass (almol) Melao volume (4) = 75 x 64 24.4.5 . [.: molar mass, so2 = 64 glmel ] concentrationcong/m?) - 196.319 ugim?
The concentration of so2 is taken from the recent standards of, June 2010