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Homework Assignment No. 1 Venturi scrubbers Discuss the various ways a liquid is introduced into the throat of a venturi scrubber 2. Two particulate air pollution control devices operate in series with collection efficiencies of 90 and 99%, respectively. Calculate the overall efficiency of the two units. 3. The number of transfer units, N, in a venturi scrubber is related to the fractional efficiency, E, of operation through the equation: N[ In[1/ 1100 Calculate Eif N = 3.0. The number of transfer units, N, in a venturi scrubber is related to the total power, P, through the equation: NOP Calculate Nifa=1.47, b = 1.05, and P = 1.62. s. Calculate the power requirement of a venturi scrubber treating 380,000 acfm of gas and operating at a pressure drop of 60 inH.O. 6.A venturi scrubber is employed to reduce the discharge of fly ash to the atmosphere. The unit is presently treating 215,000 acfm of gas, with a concentration of 4.25 gr/ft", and operating at a pressure drop of 32 inH.0. Experimental studies have yielded the following particle size collection efficiency data: Particle diameter. Om Collection efficiency, $ 30 10 20 86 30 93 50 97 75 99.9 987 Refer to Problem 6. Calculate the daily mass (in tons) of fly ash collected by the scrubbing liquid and discharged to the atmosphere. 8. Refer to Problem 6. Obtain the particle size- distribution of the fly ash collected and discharged to the atmosphere. Comment on the results. 2. Two particulate air pollution control devices operate in series with collection efficiencies of 90 and 99%, respectively. Calculate the overall efficiency of the two units