Browse Prior Art Database

Systems for reducing particulate emissions from dryers using one or more effective cyclones

IP.com Disclosure Number: IPCOM000239745D
Publication Date: 2014-Dec-01
Document File: 8 page(s) / 261K

Publishing Venue

The IP.com Prior Art Database

Related People

Karin Nordström Dyvelkov: AUTHOR

This text was extracted from a PDF file.
This is the abbreviated version, containing approximately 21% of the total text.

Page 01 of 8

Systems for reducing particulate emissions from dryers using one or more effective cyclones

Introduction

This document describes a row of technologies for recovering dried product originating from liquid feeds, pastes or solids. The technologies described in this document may be used and combined in all possible ways for all products within dairy, food, agri-food, chemical, agro-chemical, energy, biotechnology, pharmaceutical, healthcare, detergents, cellulose, mining, mineral, fertilizer and many more, and are not limited in application to the examples given but are wide open for all such products.

At the end you will find a list of references which is a basis for and/or a supplement to this article. These references shall be considered an integrated part of this document to be incorporated by reference.

Throughout this document the term "air" will refer to air as well as gasses (e.g. N2).

Drying systems

Many systems exist for drying liquid feeds, pastes and solids. They all have in common the need to recover the dried/semi-dried product afterwards. The drying process can use one or a combination of a number of different technologies. Some examples for drying equipment are: spray dryers, ring dryers, flash dryers, feed-type ring dryers, P-ring dryers, twin ring dryers, drum dryers, rotary dryers, fluidized bed dryers and coolers, SPRAY FLUIDIZER™, rotary dryers and coolers, superheated steam dryers, steam ring dryers, SWIRL FLUIDIZER™, spray drying absorbers, spray congealing/ cooling/ crystallization/ polymerization, and many more. The choice of dryer depends very much on the type of product, economy and desired properties of the dried product.

All types of dryers consist of a feed inlet, a drying/cooling air inlet, a drying/cooling chamber, a product outlet (product together with drying air or separate from the drying air) and systems for exhaust air cleaning. The dryers are built into a system that meets the individual operational safety, environmental protection and powder recovery requirements. All systems can be provided with pre- and post-treatment equipment, and for example fluid bed dryer/cooler, agglomerator/granulator, de- duster and conveyor. Also the systems are available in open, closed, semi-closed and aseptic cycle versions.

Drying involves the atomization of a liquid feedstock into a spray of droplets and contacting the droplets with hot air in a drying chamber. The sprays can be produced by for example either rotary (wheel)- or nozzle atomizers. Rotary wheel atomizers may e.g. be of type channel-wheel, pin-wheel, cup-wheel. Nozzle atomizers may e.g. be of type pressure-nozzle, two-fluid nozzle, three- or four fluid nozzles, COMBI- NOZZLE™. Evaporation of moisture from the droplets and formation of dry particles proceed under controlled temperature and airflow conditions. Powder is discharged continuously from the drying chamber. Operating conditions and dryer design are selected according to the drying ch...