SLUDGE PREPARATION UNIT FROM ASH AND SLAG WASTE Russian patent published in 2017 - IPC B03B9/04 

FIELD: power industry.

SUBSTANCE: sludge preparation unit from ash and slag waste contains a mixer of waste with a thinning medium, equipped with a mixing means and aline for feeding the thinning medium, a doser-feeder for the ash and slag waste, a consistency metre of the thinned ash and slag sludge installed behind the mixer. The ash and slag feed line connects the mixer to its storage unit. The sludge mixer tank and its storage unit tank are made with conical bottoms, with an angle of inclination greater than the angle of the natural slope of the slurry. The upper part of the sludge mixer tank is equipped with an ash and slag waste loading branch pipe, which is connected to the ash and slag waste doser-feeder, which is not aligned with the vertical axis of the sludge mixer tank, and is provided with a branch pipe for receiving the thinning medium, preferably oriented tangentially with respect to the vertical axis of the tank. The mixing means comprises an immersion slurry pump, the pressure branch pipe of which is connected by a recirculation line connected to the bottom branch pipe of the mixer tank via the first valve. The pressure branch pipe of the slurry pump via the second valve is connected to the feed line of the ash and slag sludge, which input to the sludge storage unit is made tangential. The suction branchpipe of the immersion slurry pump is placed with clearance to the outlet of the bottom branch pipe and to the walls of the mixer tank. The mixer is located below the sludge storage tank, the upper end of which is connected to the bottom of the mixer tank by a drain pipe. The upper wall of the sludge tank is provided with an air supply branch pipe. The sludge discharge line for processing is provided with the third valve and is connected with the bottom outlet of the pulp tank capacity, which is connected to the recirculation line via an additional pipeline through the drain valve.

EFFECT: increased efficiency of uniform distribution of particles with differing hydraulic size over sludge volume and excluded formation of sludge particle accumulation zones in the mixer's volume.

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