Improve Lime Mud Kiln Operation By Controlling Mud Moisture Using an Inside-The-Dryer Moisture Sensor, 2016 Pulping, Engineering, Environmental, Recycling, Sustainability (PEERS) Conference Proceedings 

A lime mud kiln consists of three sequential unit operations: drying, heating, and calcining. Traditionally, two control loops have been used: A hot end temperature (het) loop maintains the proper calcining temperature, and a cold end temperature (cet) loop is used, perhaps unwittingly, as a non-theoretical mud moisture (mc) sensing and control loop. This cet loop is similar to the flawed, non-theoretical exhaust temperature mc sensing and control loop used for controlling the mc of products being dried using industrial dryers, including counter-current rotary dryers.  Fortunately, this flawed mc sensing and control problem has been solved for industrial dryer applications; therefore, it is proposed as a replacement for the old (cet) loop in a new lime mud kiln control system. Based on the analogous relationship between a cet loop and a delta t loop = (het – cet) = delta t loop, if the delta t loop replaces the cet loop on a kiln, the drying zone will be controlled to a constant length with at least 30% less variation in length, and this
will in turn control the calcining zone to a constant length with at least 30% less variation in length. Therefore, the delta t loop will control the length (time) component and the het loop will control the temperature component of the time-temperature parameter necessary for producing a superior finished lime.

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