Manual Transporte Nuematico

Pneumatic Conveying Design Guide

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Pneumatic Conveying Design Guide
Second Edition David Mills

AMSTERDAM BOSTON HEIDELBERG LONDON NEW YORK OXFORD PARIS SAN DIEGO SAN FRANCISCO SINGAPORE SYDNEY TOKYO

Elsevier Butterworth-Heinemann Linacre House, Jordan Hill, Oxford OX2 8DP 200 Wheeler Road, Burlington, MA 01803 First published 1990 Second edition2004 © David Mills 2004 This publication contains material from Pneumatic Conveying Design Guide 1990 which was written by Dr David Mills under contract with the Department of Trade and Industry. © Crown copyright 1990. Reproduced with the permission of the Controller of Her Majesty’s Stationery Office Permissions may be sought directly from Elsevier’s Science and Technology Rights Department inOxford, UK: phone: 44-0-1865-843830; fax: 44-0-1865853333; e-mail: permissions@elsevier.co.uk. You may also complete your request on-line via the Elsevier homepage (http://www.elsevier.com), by selecting ‘Customer Support’ and then ‘Obtaining Permissions’ All rights reserved. No part of this publication may be reproduced in any material form (including photocopying or storing in any medium byelectronic means and whether or not transiently or incidentally to some other use of this publication) without the written permission of the copyright holder except in accordance with the provisions of the Copyright, Designs and Patents Act 1988 or under the terms of a licence issued by the Copyright Licensing Agency Ltd, 90 Tottenham Court Road, London, England W1T 4LP. Applications for the copyrightholder’s written permission to reproduce any part of this publication should be addressed to the publisher British Library Cataloguing in Publication Data A catalogue record for this book is available from the British Library Library of Congress Cataloging in Publication Data A catalog record for this book is available from the Library of Congress ISBN 0 7506 5471 6

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Contents
Preface Part A: Systems and Components 1. Introduction to pneumatic conveying and the guide 1.1 Introduction 1.2 Pneumatic conveying 1.3 Information provided 1.4 Review of chapters 1.5 Definitions 1.6 Nomenclature References Review ofpneumatic conveying systems 2.1 Introduction 2.2 System types 2.3 System requirements 2.4 Material property influences References Pipeline feeding devices – Part I: Low pressure and vacuum 3.1 Introduction 3.2 Rotary valves 3.3 Screw feeders 3.4 Venturi feeders 3.5 Gate lock valves 3.6 Suction nozzles 3.7 Trickle valves 3.8 Blow tanks References Pipeline feeding devices – Part II: High pressure 4.1Introduction 4.2 Screw feeders 4.3 Rotary valves 4.4 Blow tanks 4.5 Lock hoppers References Pipelines and valves 5.1 Introduction 5.2 Pipelines 03 03 03 13 14 20 25 28 29 29 29 48 50 53 54 54 58 68 69 71 73 76 77 79 80 80 81 82 82 101 103 104 104 104 xi

2.

3.

4.

5.

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CONTENTS

5.3 5.4 6.

Valves Rubber hose References

110 114 116 117 117 117 130 137 137 138 139 139 140 141 150151 152 152 153 155 164 164 172 177

Air movers 6.1 Introduction 6.2 Types of air mover 6.3 Air compression effects 6.4 Pre-cooling systems 6.5 Nomenclature References Gas–solid separation devices 7.1 Introduction 7.2 Dust control 7.3 Separation devices 7.4 System considerations References System selection considerations 8.1 Introduction 8.2 Variables involved 8.3 Variables investigated 8.4Material compatibility 8.5 Design curves 8.6 Power requirements 8.7 System selection considerations

7.

8.

Part B: System Design 9. Air flow rate evaluation 9.1 Introduction 9.2 Volumetric flow rate 9.3 The influence of pressure 9.4 Stepped pipeline systems 9.5 Pipeline purging 9.6 The influence of temperature 9.7 The influence of altitude 9.8 The use of air mass flow rate 9.9 Nomenclature 183 183...