Inline Relative Humidity SoftSensor

If the evaporative load to a flash, spray, ring, or rotary dryer is increased, the exhaust temperature will be cooled further due to the increased evaporative load that consumes more sensible heat from the circulating air. Consequently, the temperature drop (∆T) will increase the humidity (H) of the air will increase, and the humidity (H) will decrease. Therefore, (H) is directly proportional to (∆T) and (RH) is inversely proportional to (∆T). These are written as porportionalities.

H oc (∆T)

(1/RH) oc (∆T)

MC oc (∆T)

Therefore, H, (1/RH) and MC are oc to (∆T) and may be sensed using the common (∆T) process parameter. Both H and RH may be substituted into the Delta Model.

MC = K1(∆T)p – (K2/Sq)

for MC to give humidity and relative humidity sensing and control systems for corrosive and high temperature dryer exhaust.