Abstract: A high pressure automatic lime mud precoat filter cake heel removal system provides for steady kiln operation. The system provides multiple points of washing located such that washing of the entire filter can be accomplished in a short period of time. Each washing point comprises preferably two nozzles at predetermined angles to optimize washing of the filter media. The system is reciprocatively driven by a fractional horsepower gear motor connected to a torque converting coupling which is, in turn, connected to a threaded jack shaft or lead screw. The gear motor is controlled by a dual speed reversing variable frequency drive; limit switches automatically control cycling of the system in conjunction with logic circuits and sensors. This system is variably controlled so that cycle times may range optionally from approximately one to approximately five hours in length.

Abstract: A feedwell for use in a clarifier tank is disclosed which provides improved energy dissipation and reduction of fluid velocity in an influent feed stream to reduce turbulence in the clarifier tank as the influent feed enters the clarifier tank for separation. The feedwell generally comprises a walled member having a substantially continuous wall which is structured to provide an area of increasing cross sectional area so that liquid circulating through the feedwell is reduced in velocity as it moves through the feedwell and into the clarifier tank. The feedwell may include additional elements which enhance dissipation of energy, including an angled rim positioned at the lower edge of the walled member to provide a contact surface against which fluid may flow to dissipate energy, and at least one baffle. The feedwell of the present invention improves the settling rate of clarifier tanks and simplifies operation while reducing operating costs.