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Decanter Centrifuge Handbook, 1st Edition

 
Decanter Centrifuge Handbook, 1st Edition,A. Records,K Sutherland,ISBN9781856173698
 
 
 

Records   &   Sutherland   

Elsevier Science

9781856173698

9780080503820

440

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Description

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.

Readership

Process designers, manufacturers and users of decanters.

A. Records

Decanter Centrifuge Handbook, 1st Edition

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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