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The exhaust from a rotary kiln hazardous waste incinerator must be cooled from 1200 degrees C to 300 degrees C before entering a spray dryer for acid gas removal. The engineer in charge of this project investigated severla alternatives to cool the exhaust gas and has concluded that the two most practical solutions would be either the installation of a waste heat boiler or the installation of a spray injection system in which water is sprayed directly into the exhaust duct upstream of the spray dryer. Based on the following data, which option should be selected?
Waste Heat Boiler
Cost installed $2 million
Service life 10 years
Operating cost excluding depreciation $0.4 million/year
Generated steam value $0.4 million/year
Water injection system
Cost installed $0.5 million
Service life 5 years
Operating cost excluding depreciation $0.15 million/year
Note: The additional water vapor added to the exhaust gas will increase the size of the spray dryer by 50%. The original spray dryer cost was estimated to be $1.0 million with a service life of 10 years.
A 10,000 cubic yards fill along a forest road right of waywill be compacted using grid rollers to a unit weight of 120 poundsper foot cubed. the fill material will be hauled to the site in 12cubic yard dump truck that are tipically loaded to about 85..
A block begins to slide down a ramp after being elevated to an angle of 47.5 degrees. What is the coefficient of static friction
Sandwhich structures are obviously very efficient in bending applications. Would they be equally efficient in tensile or compressive loading? Explain your answer in terms of area available for carrying tensile-compressive loads.
A long trough is supported by a hinge along its lower edge and a series of horizontal cables attached to its upper edge. Determine the tension in each of the cables, at a time when the trough is full of water.
The undeformed length of the spring is l. Knowing that the collar is released from rest at x = and neglecting friction between the collar and the horizontal rod, determine the magnitude of the velocity of the collar as it passes through point C.
The 24-in pipe leads from a reservoir (flush entrance), and the 18-in pipe discharges into the air at a point 15 ft lower than the reservoir water surface level. Assuming all changes in section to be abrupt
The ship has a total weight of 155,000 tons, length = 1,600 feet and a beam = 150 feet (assume that it is the shape of a rectangular box). Calculate the height above the waterline of its center of Gravity (G).
A permeameter with a cross-sectional area of 400 cm2 contains 3 soils in 50 cm thick layers. A total head difference of 2.0 metres results in a flow rate of 100 cm3/s. The head loss through the top layer of soil is 50 cm.
(a) How is raw pig iron extracted from iron oxide ores (b) Write a typical chemical reaction for the reduction of iron oxide (Fe2O3) by carbon monoxide to produce iron.
A clay ball (m=0.82 kg) is thrown at a metal target (M=1.72 kg) that is suspended from a cable. The ball is released 1.5 m above teh ground at an angle of 32 degrees. There is a completely inelastic collision between the ball and the target at a heig..
What is the total deformation in a 15' 2'' square steel hanger that supports a 36000 pound load
A wheeled tractor with high-pressure tires and weighing 74,946 lb is pulled up a 5% slope at uniform speed. If the tension in the tow cable is 13,000 lb, what is the rolling resistance of the road
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