A power plant produces a flue gas with a mass flow rate of 2 million pounds per

Question

A power plant produces a flue gas with a mass flow rate of 2 million pounds per hour. Of that, 150,000 lb/hr is water vapor, and 15,000 lb/hr is SO2. All the other gases that are not SO2 or water have an average molecular weight of 28.

(a) Calculate the concentration of SO2 in the flue gas in ppm(v) (dry basis). Regulations require that 92% of the SO2 be captured, and a limestone scrubber will be used to do the job. Assume that scrubber exit gases are saturated with water vapor at 125 degrees Fahrenheit.

(b) Estimate the SO2 concentration of the exiting gases in ppm(v) (dry basis). Assume that there is no HCl in the gases, and that the limestone is 96% CaCO3 (with a MW of 100) and 4% inerts. The alkalinity supplied will be 1.12 times the stoichiometric ratio.

(c) Calculate the limestone feed rate, lb/hr. Assume that the flow rate exiting the scrubber is 800,000 acfm and the scrubber pressure drop is 10 in. H2O. Calculate the fan power used just by the scrubber, in hp.

Explanation / Answer

rate of production is the amount that your product is produced in a scale of time. for example the rate of production of a steam stripper would be 21 kg per hour or etc. To calculate the rate of production of something you need to have the power of your reactor (in watts). when you have the power you will be able to get energy that your reactor produces in a certain amount of time. By knowing the energy you'll be able to work out the amount (in kg) and work out the rate of production

The chemical feed is the amount of chemical you add to the water, commonly given in lbs/day. The chemical feed rate is typically set on a chemical feeder of some sort so that the chemical is automatically added to the water throughout the day. A higher chemical feed rate means that chemicals are being added to the water more quickly.

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