Baghouse and ESP dust conveyors

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Do you need a hassle free, flexible solution to move your baghouse dust to a central storage silo – we have the solution.

We can collect material from multiple outlets on your baghouse , ESP or baghouse cyclones and pneumatically convey it to a central point, cleanly and efficiently with a flexible pipeline routing and space saving installation.

Twenty three years ago the founding members of the company put their heads together to find a solution to the problem of airlock abrasion, pipe blockages and pipeline overloading on existing baghouse pneumatic conveyors.

The requirements: An airlock feed system that ensures a positive seal at all times. A feed system that can accomodate large seal at all times. A feed system that can accomodate large numbers of infeed points without losing valuable conveying air through those infeed points.

The system must be maintainable without downtime. The system must accommodate and be able to recover from material backlogs in the baghouse hoppers.

This last point is crucial as the systems needs to be designed around the 0.2% of the time that the baghouse is not running under normal conditions i.e. the hoppers are full of material due to possible conveyor downtime or larger volumes of material dropping off the bags at any given time.

The result was the development of the pneumatic double flap valve with rotary actuators as the main component in the airlock mechanism.

The flap valve functions like the double security doors in banks. The top flap opens to allow material to flow through into an intermediate chamber and the closes. Only then does the bottom flap open to release the material into the conveying pipeline. The flat rubber moulded lining of the flap ensures that a positive seal is achieved against the feed and outlet chute. Air leakage is kept to minimum and only consists of the pressurerised air volume between the two flaps. No continuous air leakage – no sandblasting type abrasion wear.

A further advantage is that flaps are replaceable with the unit installed. The flap replacement kits can be kept on the shelf with no matching required before installation. Rotary actuators are used on the flap valves for superior life cycle expectancy compared to the traditional linear cylinders.

The initial capital outlay of the double pneumatic flap valve system is higher than with a system using rotary valves alone. The operational savings in terms of maintenance, reduced downtime and hassle-free operation are substantial over the life of the plant.

Flap valves cannot accomodate a head of material above the inlets. With a potential head of material above the feed arrangement (which may be present as result of backlog due to plant stoppage and surges of material that are dislodged from the bags) a rotary vane feeder is used to meter material into the flap valve. rotary vane feeder tip wear is no concern as the sealing against the conveying air pressure is accomplished by the flap valve. The rotary van feeder serves as a meeting device only.

A special pipeline bend was developed to counter the bend wear problem that is traditionally associated with pneumatic conveyors. In-situ tests on conveying highly abrasive Sinter dust have shown the life expectancy of these brands to be more than 24 months.

Another advantage is that the system can also handle coarse material – a point well worth taking into consideration when looking at moving the coarse material from the baghouse cyclones to a central silo.

Currently the Techmatic baghouse dust conveyor is installed on plants such as Arcelor Mittal, Highveld Steel, Samancor, Richards Bay Minerals and Assmang Chrome. Speak to us about your requirements and we can advise on the best and most cost effective solution.