Calculate the flow rate (kg/h) of coffee beans fed to the process, the boiling water mixed with the coffee beans in the percolator, the slurry from the cyclone separator, the stream fed to the spray dryer, the liquid solution from the press, the slurry from the press, and the water evaporated from the dryer and from the spray dryer. Diagram is needed.
Coffee beans contain components that are soluble in water (S) and
others that are not soluble (I). Instant coffee is produced by
dissolving the soluble portion in boiling water in large percolators
which produces two streams – a slurry fed to a cyclone separator and
a liquid solution (C) containing 35% S and 65% W. The solution C
removed from the grounds in the cyclone separator is mixed with the
effluent from the percolators prior to feeding to a spray dryer. In the
spray dryer, water is evaporated, leaving the soluble coffee as dry
powder at a rate of 500 kg/h. The cyclone separator also produces a
slurry containing 20% I and 80% solution C. The slurry is fed to a
press removing some of the solution C and a slurry product
containing 50% I and 50% C which is then fed to a dryer where the
dried grounds are either burned or used as landfill. The dryer
produces 1400 kg/h dried product containing 70% I and the balance,
S and W. Calculate the flow rate (kg/h) of coffee beans fed to the
process, the boiling water mixed with the coffee beans in the
percolator, the slurry from the cyclone separator, the stream fed to
the spray dryer, the liquid solution from the press, the slurry from
the press, and the water evaporated from the dryer and from the
spray dryer. Diagram is needed.
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