11 May WHAT PRODUCTION RATE OF DRIED GRAINS CAN BE EXPECTED FROM THIS PROCESS?
Calculate the feed rate of corn in Ibm/h. Estimate the acreage required to supply this plant with corn. (Mote: According to the U.S. Department of Agriculture, Crop Production, 11/9/78, p. A-3, 101.2 bushels of corn are harvested from an acre.)
3. Calculate the molar flow rate (lb-moles/h) of ethanol product.
4. How much water (combined fresh water and condensates) must be added to the mixing tank to obtain the desired mash volume?
5. The C02 produced as a by-product from the fermentation reactor may be useful if it is recovered in sufficient quantity. Estimate the production rate of C02 in pound-moles per hour and standard cubic feet per minute.
6. What fraction of the dried grains must be recycled to control the moisture content of the grains entering the dryer? What production rate of dried grains can be expected from this process?
7. What is the minimum pressure at which the cooking vessel must operate? What is the pressure to which the mash must be flashed to provide a resultant liquor temperature of 145°F? At what rate (lbm/h) is water vaporized in this step?
8. Determine the rate (lbm’h) at which 15-psig steam must be supplied to heat the mash from the precooking vessel to 230°F. How much live steam must be injected to raise the tem¬perature of this stream to 320°F? It has been suggested that a portion of these steam requirements could be met by the vapor from the flash occurring at 15 psig. Is this feasible? If so, what fraction of the required 15-psig steam can be supplied by this means?
9. At what rates must heat be removed to condense the vapors from the distillation column? Suppose cooling water at 85°F is available and the tempera¬ture increase of this water is limited to 25°F. At what rates must water be supplied to the condenser?
10. Estimate the quantity of 3A molecular sieves required in one adsorption bed?
11. At what rates must heat be removed in-order to cool the distillate prior to sending it to the adsorption column? Cooling water from well at 60°F is available and the tempera¬ture increase of this water is limited to 25°F. At what rates must water be supplied to the heat exchanger?
12. At what rate must the hot gas be fed to the drier to provide the required drying of grains? If this gas is to be obtained from the combustion of Illinois No. 6 coal with 30% excess air, how much coal is required?
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