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A material containing 75% water and 25% solid is fed to a granulator at a rate of 4000 kg/hr.
A material containing 75% water and 25% solid is fed to a granulator at a rate of 4000 kg/hr. The feed is premixed in the granulator with recycled product from a dryer, which follows the granulator (to reduce the water concentration of the overall material fed into the granulator to 50% water, 50% solid). The product that leaves the dryer is 16.7% water. In the dryer, air is passed over the solid being dried. The air entering the dryer contains 3% water by weight (mass), and the air leaving the dryer contains 6% water by weight (mass).
a. What is the ratio of the recycle to the feed entering the granulator?
b. What is the rate of air flow to the dryer on a dry basis?
