2. A P&ID of a phosphate pebble dryer is shown in the figure below. A feeder (table feeder) moves the pebbles into the dryer under automatic feedback control to maintain the outlet pebble moisture concentration (wt% moisture) at 3 wt%. If the pebbles leave the dryer too dry, they may break down into a fine powder, which will be unusable. If the moisture level of the pebbles leaving the dryer is too high, then they may agglomerate and form unusable chunks of material in the storage silo and could plug the flow from the silo. The speed of the feeder table is directly proportional to the output of the moisture controller (M(t); signal has the range of 0- 100 %CO). The moisture transmitter has an operational range of 1 wt % moisture to 5 wt % moisture, and sends a 0 – 100 %TO signal to the moisture controller. MC I. D. fan Stack Table feeder, MT Bed Fuel Combustion furnace Conveyor Windbox Combustion air a) (28.6%) What is the action of the moisture controller? Please show your work.

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