PVC centrifuges for Europe and China
Broadbent Centrifuges has supplied orders for large Solid Bowl Decanters for Suspension PVC processes in China, Hungary, Belgium, Germany and Spain.
The orders were placed by PVC producers: Cangzhou Chemicals (Hebei Province China), Borsodchem (Hungary) and Solvay Plastics (for production processes in Belgium, Germany and Spain).
The 100mm diameterx1500mm solid bowl decanter centrifuges, being supplied for dewatering purposes, are capable of throughputs in the region of 12–16tons/hour of dry PVC, depending on production requirements.
The high volume capacity of Broadbent PVC decanters provides relatively high residence times which allow low cake moisture to be achieved without the need for very high rotational speeds. This has been found to provide appreciable cost benefits by extending the life of major components and minimising downtime on routine maintenance.
For this type of duty, Broadbent also offers decanters providing variable differential bowl to conveyor speeds – optional features provided by the use of frequency inverters and back-drive motors.
“With world-wide expansion in the demand for suspension PVC currently in excess of 4percent per annum,” says Broadbent’s Business Development Director John Wright, “the market for PVC decanters is increasing but continues to be highly competitive. We are continuing to strengthen our position as an accredited supplier to the International suspension PVC industry by systematically acquiring the necessary licence approval certificates from many of the world’s leading producers. We are also aware of the fact that individual production lines are increasing in size in an industry that can no longer afford to tolerate downtime. With a good combination of high residence times, low moisture content in the final PVC (polyvinyl chloride), high throughput, low maintenance and outstandingly high levels of product recovery, our centrifuges more than satisfy all the necessary criteria.
In addition to being highly compatible with international PVC production processes, hundreds of Boadbent installations throughout the world have proved to be extremely cost-effective and reliable.”
At the heart of the Broadbent design is a anti-chatter device that is connected directly to the decanter’s internal conveyor system – a feature which protects vital components such as gearboxes and bearings from the effects of chatter-induced torque peaks, which occur when the PVC adheres to the centrifuge bowl during discharge.
Additional operational resilience is also provided by the use of a robust planetary gearbox, manufactured in-house to a Broadbent design. This helps to maximise the safety margin between the actual operating torque and the gearbox’s continuous torque rating.
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Thomas Broadbent is based in Huddersfield, UK. www.broadbent.co.uk
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