Read MC 543 Cyclone Separator Application 05_03_04.pmd text version

Cyclone Separators

Explosion Suppression Systems

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EX 200 TM CONTROL PANEL

AC ON HORN SI LENCE FAULT ALA RM DIS ARM ARM

ARMED

FENWAL

Safety Systems

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Application

Cyclone separators are used both as receiving vessels and for the collection of dust. They separate solids from the air stream by the centrifugal action of a vortex created as the inlet air tangentially enters the cyclone. The dust or granular material is thrown to the walls of the cyclone and then falls to the hopper section from which it discharges via a rotary gate valve. Meanwhile the cleaned air exhausts through an outlet.

System Components

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Pressure Detector Control Panel High Rate Discharge Extinguisher Isolation Extinguisher Rotary Gate Valve (by others)

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FENWAL Protection Systems

®

Hazard

If the material being handled by a process is combustible, then the dust it generates is likely to be explosive. When a cyclone is used as a primary separator, an explosible dust cloud may be present continuously during normal operation. Under these conditions, an ignition source is all that is required to trigger an explosion. This can be provided by static electricity or by incoming burning particles from upstream equipment such as mills or dryers.

Protection System Description

Cyclones are frequently located inside the plant where explosion relief venting is impractical. Additionally their configuration makes explosion relief venting a challenge since a smooth inside wall and adequate vent area are required. An explosion suppression system provides the solution. In such a system, explosion pressure detectors, mounted on the cyclone, detect the pressure excursion from an impending explosion. The detectors transmit a signal to a control panel, which triggers high rate discharge extinguishers while simultaneously shutting down the process. Extinguishers mounted on the cyclone are designed to rapidly discharge suppressant and quench the fireball before maximum pressures are reached. An isolation extinguisher mounted on the inlet duct mitigates flashback to upstream process equipment. Additionally an explosion-proof rotary gate valve mounted on the hopper reduces the likelihood of burning materials passing downstream.

Protection System Considerations

Protection systems for cyclones must accommodate the need to maintain a smooth inside vessel wall for efficient cyclone performance. Fenwal's suppression systems achieve this by using flush spreader assemblies for suppressant dispersal.

Typical Installation Details

Extinguisher Flush Spreader Dynamic Pressure Detector

Burst Disc

Vessel Mounting Flange

Dynamic Pressure Detector Having Two Sensors

Spreader Insert

Vessel Wall

Mounting Flange

Gasket for Agent Delivery Pipe-work Fenwal is a registered trademark of Kidde-Fenwal, Inc. This application data sheet is for general information only. Actual system design will vary subject to specific process criteria.

FENWAL Protection Systems

®

Kidde - Fenwal, Inc. 400 Main Street, Ashland, MA 01721 Tel: (508) 881-2000 Fax: (508) 485-3115 Publication: MC-543 Issued: 05/03/2004 © 2004 Kidde-Fenwal, Inc.

Information

MC 543 Cyclone Separator Application 05_03_04.pmd

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MC 543 Cyclone Separator Application 05_03_04.pmd