Sludge Mixer MFS0 pages

Sludge Mixer
MFS
PUMPTECHNOLOGY MFS
133.29801.56.01 E 11/04
TECHNICAL DATA
Capacity: 350 - 7200 m³/h
Speed: 1500 - 420 1/min
Shaft seal: lip seal system
Direction of rotation: clockwise and anticlockwise
APPLICATION
The mixers are designed to circulate in egg-shaped, conicalcylindrical
or cylindrical digesters causing an optimum mixing in
both directions and a uniform heating of the sludge.
The mixers designed for continuous reversible operation. The
ability to circulate sludge in either direction for long periods of time
fulfils two important process requirements:
a) Downward flow
The impeller forces surface sludge, including coarse
floating residue, down the draft tube resulting in an ideal
intermixing and blending action that agitates settled sludge
in the bottom of the digester. In the event foam forms
on the top of the digester, will be sucked down the draft
tube and remixed with the digester content.
b) Upwards flow
The circulates sludge under pressure from the bottom of the
digester up the draft tube to the rotating splash disc. The
splash disc distributes the sludge over a large sludge surface
area softening and dispersing the supernatant sludge layer.
DESIGN
Vertical single-stage and two-stage Sterling Halberg mixers with
special screw-type impellers and a deflector disk mounted on the
shaft.
The draft tube acts either as a suction pipe or as a discharge pipe.
The shaft is supported in a combined thrust and guide bearing
located in the seating ring.
The mixer is driven by a motor or an intermediate gear whose
pedestal is mounted on the foundation.
The draft tube length can be changed to suit the application.
Assembly is made easy by the flanged pipe section design.
DESIGN DETAILS
According to code 94/9/EG (ATEX 100 a)
Flanges:
Dimensions of connection:
draft tube, inlet piece, discharge piece: DIN 2501 PN 10
Bearings:
Thrust and guide bearing in combined grease-lubricated
rolling bearing design.
Bearing temperature monitoring with two immersion
resistance thermometers PT 100 of intrinsically
safe construction.
Shaft sealing:
Viton cap-type gaskets provide methane-resistant shaft
sealing
Types of installation:
Concrete digester: Gas-tight grouting directly in the
digester ceiling.
Steel digester: Gas-tight grouting, with synthetic
resin, in a gas cap
or
embedded in a concrete cone.
Retrofits/ Gas-tight grouting, with synthetic
reconstructions: resin, in a gas cap
Automatic lubrication:
The bearings and the lip seal system are continuously
supplied with a grease deposit (10 l) by a grease pump.
- Level monitoring by means of a proximity
switch of intrinsically safe construction
- Lubricants: Sterling Halberg mixer grease
(standard) or Sterling Halberg Planto
(biodegradable)