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Air Dispersion Modela power plant burns 150,000 tonnes (1 tonne = 1,000 kg) of coal each year. The coal has 2.5% sulfur content, and the air pollution control equipment removals approximately 94% of sulfur. Assume 10% of the sulfur content ends up in the ash. The remaining combustion products are discharged through an 80 m stack with a diameter of 3.0 m. The stack off gas temperature and velocity are 320 oC and 4 m/s, respectively, and the atmospheric conditions are 102 kPa and 25 oC. If the atmospheric conditions are slightly unstable (Class C) and the wind velocity at 10 m elevation is 3.5 m/s:
1. Plot the ground level concentration of sulfur dioxide as a function of distance from the stack and determine the maximum ground level concentration at both with and without air pollution control and the distance from the stack where the maximum concentration occurs.
2. With air pollution control equipment in place, plot the contours for a ground level concentration that is half and ¼ of the maximum value and indicate on your plot the location of the stack and the location of the point where the maximum ground level concentration would occur.
3. Compare your result with Ambient Air Quality Standard and comment it.Note:Sulfur dioxide:Ambient Air Quality Standard = 0.03 ppm at annual average (80 µg/m3 or 8 x 10-5 g/m3 )Lethal concentration: 400-500 ppm (0.11-0.14 g/m3 )
CALCULATE THE REQUIRED DIAMETER OF STEEL TIE RODS NECESSARY TO SUPPORT A BALCONY. EACH ROD, SUSPENDED FROM A ROOF TRUSS, SUPPORTS A FLOOR AREA OF 7.0m^2. THE COMBINED BALCONT FLOOR LOAD IS 10.5 kPa
Determine the cycle time for a single engine scraper rated at 21 cy heaped that is used to haul material from a pit to a fill 900 ft away under severe conditions. The average haul speed will be 14 mph and the average return speed will be 20 mph.
A constant head permeability test was conducted on a clean sand sample. The diameter and length of the test specimen were 10 cm and 12 cm respectively.
inability and green engineering can be integrated in the four components of materials science and engineering?
The entrance to Mt. Hood Meadows (elevation 3,075 ft at the point of crossing) is grade separated from Viking highway (elevation 3,050 ft at the point of crossing) and will have to be connected. The two roadways intersect at a right angle.
To what maximum angle, measured from vertical, does the rod (with the attached ball of clay) rotate?
At what speed the rule of 25 feet separation between two cars is safe?
If a car engine is turning at 4000 rpm, the transmission gear ratio is 3:1 and the final drive ratio is 4:1. (a) what is the speed in rpm of the car wheels and (b) the vehicle speed if the tire radius is 8 inches
A four-lane urban freeway (two lanes in each direction) is located on rolling terrain and has 12-ft lanes, no lateral obstructions within 6 ft of the pavement edges, and an interchange every 2 miles.
Assuming that silt is equivalent to a liquid having a density of 1760 kg/m3, determine the overturning moment of silt and water about point A.
Calculate the force (in Kn) a punch press must exert if it is to punch out a large washer from a strip of 5-mm thick sheet steel with an ultimate shear strength of 400 MPa. The washer dimensions are as follows: hole diameter is 27 mm. outside diam..
What is the minimum distance from the stalled car at which the driver could apply the brakes and still stop before hitting it? Assume coefficient of rolling resistance of 0.013.
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