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Clarifier/Thickener Drives

Bridge-Mounted Drive Units

 

 

 

  • A low-speed, high-torque, totally enclosed gear drive with positive overload protection
  • The drive unit is supported by a bridge completely spanning the tank
  • The drive unit has a central output shaft to drive the rakes
  • Used in industrial, municipal and mining clarifiers and thickeners
  • Typically used on tank sizes from 10 to 100 ft (3 to 30 m) in diameter

 

 

  • Drive unit has two concentric output drive shafts
  • Used on solids contact and flocculating clarifiers or softeners
  • Rake drive section is a low-speed, high-torque, totally enclosed gear drive with
  • positive overload protection
  • Turbine drive section is a heavy-duty, higher speed, totally enclosed gear drive
  • The drive unit is supported by a bridge completely spanning the tank
  • The drive unit has a central output shaft to drive the rakes
  • Used in industrial, municipal and mining clarifiers and thickeners
  • Typically used on tank sizes from 10 to 100 ft (3 to 30 m) in diameter

  • A low-speed, high-torque, totally enclosed gear drive with positive output torque overload protection
  • The drive unit is supported by a column in the center of the tank
  • The drive unit has an external rotating drive drum with attachment points for the rake cage
  • The drive access bridge typically spans one half of the tank
  • Used in industrial, municipal and mining clarifiers and thickeners
  • Typically used on tank sizes from 40 to 300 ft (12 to 100 m) in diameter
Browse Wishlist

  • A low-speed, high-torque, totally enclosed gear drive with positive output torque overload protection
  • The drive unit is supported by a column in the center of the tank
  • The drive unit has an external rotating drive drum with attachment points for the rake cage
  • The drive access bridge typically spans one half of the tank
  • Used in industrial, municipal and mining clarifiers and thickeners
  • Typically used on tank sizes from 40 to 300 ft (12 to 100 m) in diameter

ClearFlow Systems

CLEARFLOW™ Technology

CLEARFLOW™ TECHNOLOGY OVERVIEW
Reduction of turbidity in the liquor from green, white and mud washing clarifiers improves the operation
of the Recaust Plant. Many pulp mills have increased the loading on their clarifiers in order to meet greater
demands for liquor in the digesters. In addition, hydrodynamic modeling shows that older technology for
feedwell and bustle pipe design is inadequate to sustain flows above critical levels where product clarity
decreases dramatically. As a result, low turbidity may not be achieved even when injecting polymer.

Emission Control Systems

Collecting Plates

SEI furnishes both segmented and one-piece collecting plates.  Experience has shown that these types of plates are mechanically, structurally and aerodynamically the best plates for a precipitator.  Structurally, they stand up well to heavy repeated rapping.  Their roll formed designs resist bowing and resultant misalignment due to temperature and rapping.  When properly rapped, the collected dust is effectively sheared from the plate over its entire length and falls into the collection hopper with minimum re-entrainment.

 

Filters and Spare Parts

Doctor Blades

Carbide tipped, aluminum oxide coated, stellite, or hardened steel doctor blades are available to suit all lime mud and dregs precoat filters. Blades may be manufactured to suit customers’ specifications.

Achieve longer life, higher average discharge solids and benefit from corresponding energy savings.

Slitters and blades for many other machinery applications are available upon request. Please inquire.

Filters and Spare Parts

Drainage Grids

24” wide x 24” long of various thicknesses are available to suit customers’ specifications. Grids may be cut to size and notched to match customers’ T-strips.

Filters and Spare Parts

Drum Filter Wear Ring

Wear plates are available in a variety of sizes and materials to fit most lime mud and dregs precoat filters. For other drum or disc filter applications please inquire.

Emission Control Systems

Electromagnetic Rapping Systems

Discharge electrodes, collecting plates and gas distribution devices are subject to particulate build-up during normal precipitator operation.  When build-up is allowed to occur, electrical clearances are compromised and distorted air flow patterns develop.  Reduced electrical clearance and distorted air flow are primary causes for an ESP losing performance efficiency.

SEI rapper systems have been specifically developed and tested for continuous removal on a wide range of ash types. The key to SEI’s success is programmable controlled rapping, utilizing the most durable equipment.

The SEI electromagnetic rapper is engineered for use with rigid discharge electrodes and collecting plates.  The coil is epoxy encapsulated which ensures long life and maintenance free operation.  The system is microprocessor based and designed for maximum service life and easy operator interface.

Emission Control Systems

ELEX Discharge Electrodes

SEI ELEX Discharge Electrodes are virtually unbreakable and not subject to electrical erosion or mechanical wear – the principal causes of discharge electrode failure.

Improved Cleaning Effect

The vibrations set up by the rapping system are transmitted over the entire length of each and every electrode.

Optimum Electrostatic Design

The corona discharge is guaranteed at every point because the points are geometrically disposed throughout the whole effective column of the precipitator.  The excellent corona effect ensures optimum charging of particles and a superior – constant cleaning efficiency.

No Bending or Distortion

The lower guide frame ensures that the Rigid Electrode will not bend or deform, even when subjected to excessive variations of temperature in the precipitator.

Longest installed electrode is 50 ft.

 

Clarifier/Thickener Drives

Fluid Primary Industrial Drives

DBS manufactures custom drives for replacing worm and helical primary gear-motors used on old cast iron type clarifier and thickener drive units.