Decanter Centrifuge Handbook book cover

Decanter Centrifuge Handbook

Scope of Publication
A reference work for process designers and users of decanters, this book aims to bridge the information gap in this field - that between academic theory promoted in student textbooks and case study data in manufacturers sales literature.

Design
It includes information on design and specification, preparing the reader to select and correctly size equipment.

Purchase
As a design or project engineer working with vendors to make final equipment selection, this work provides the readers with the full facts before they start talking to product vendors.

Supply
In an environment of industry consolidation, the handbook allows you to track suppliers old and new, providing a basis on which users can find the new relevant company for the parts/service he/she wishes to purchase.

Operation
Once an equipment purchase is made, the user needs to be made aware of how to optimally operate decanters. The Decanter Centrifuge Handbook covers relevant (process) operating issues such as instrumentation and control and the use of flocculents.

Audience
Process designers, manufacturers and users of decanters.

Hardbound, 440 Pages

Published: March 2001

Imprint: Elsevier

ISBN: 978-1-85617-369-8

Contents

  • Introduction
    Decanter development Manufacturers: who entered the markeplace, who left, who owns whom, specialities of major suppliers
    Trends in technology

    Decanter Design
    Basic construction: vertical/horizontal, concurrent/countercurrent, leading/trailing conveyor, design limitation, natural frequency versus L/D and design
    Materials of construction: maximum bowl speed versus bowl diameter, materials of construction
    Basic components: bowl, conveyor, casing, drive, backdrive, gearbox, frame and mounting, inlets and outlets, bearings and seals
    Variants: bowl diameter, clarifying length, beach angle, scolling aids: liners and grooving, conveyor leads, conveyor pitch, flight profile, cant and rake, flow: axial helical and vane assisted, baffle designs, feed zone design and position, polymer inlets, gearbox designs and alternatives, cake discharge, brakes, weat inserts, tiles, noise abatement features, surface finishes
    Special features: three phase design, screen bowls, double beach design, nozzle cake discharge, vanes and discs, casing baffles, windage control, cake collectors, cake reslurry, back drive systems, centripetal pump, skimmer pipe, drain valves, high temperature and high pressure designs, compound beach angles
    Instrumentation: Tachometers, proximity probes, torque monitoring, power meters, controllers

    The Market
    Where decanters are used, how many are used, importance in that market, impact on decanter design and use for manufacturer and end-user

    Applications: effluent - municipal and industrial, drilling muds, olive and palm oils, proteins, starches, brewery and distillery grains, dairy, petrochemicals, minerals, pharmaceuticals, heavy chemicals, clays, water works sludges, fish meal, surimi, rendering
    Application Types: clarification, classification, dewatering, extra dry solids, washing, reslurry wash, thickening

    Theory
    Clarification: sigma theory, classification, thickening, compaction, limitations, examples
    Conveying: beta theory, scrolling, scrolling efficiency, dewatering examples
    Power Consumption: W&F, scrolling, process, braking, total
    Polymer Addition: mixing, flocculation time, addition point, consumption
    Pressure developed: in liquor, in cake, equivalent of torque, g-force
    Scaling: conveying, power, torque, dryness, capacity
    Particle size distribution: cut point, surface area, converting number of weight distribution, use with sigma and capacity
    Moving layer theory
    Calculating the effect of vanes and discs
    Fundamental studies

    Flocculents
    Types of flocculents: polycrylomides and others, anoimic, cationic, nonionic, molecular weight, ionic charge
    Dosing Make-up: methods, equipment, time, concentration, addition point

    Test work and data
    Test methods: equipment needed, planning the test, data needed, manipulating the data, examples of data to illustrate theory

    Calculations and scale-up
    Options
    Identifying the pertinent method
    Data needed
    Preparing the date: function to be calculated
    Mass balance
    Recovery
    Polymer Dose
    g-level
    Power Calculations
    Worked examples

    Plant Instrumentation and Control
    The complete decanter plant is considered. Feed and polymer pumps, polymer make up systems, off-take conveyors and centrate receivers will all be included. Instrumentation in common use will be enumerated including mechanical and electronic devices. These will include level indicators, speed meters, torque meters, solids in liquid monitors and meters, timers, starters, vibration monitors and bearing condidtion monitors

    Decanter Features for special applications

    Tables of decanter data

    Nomenclature, acknowledgements, references, index

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