Handling technology for bulk materials - company division Sklenář s.r.o.

Pneumatic conveying

Pneumatic conveying is a closed conveying system designed to transfer bulk materials for dozens ,up to hundreds, of metres with a throughput ranging from single kilos up to dozens of tons an hour.
Pneumatic conveying can be used in almost any industry. Although its use is widespread, individual installations cannot be simply generalised, and it is necessary to seek an optimum type of a pneumatic conveying system for the given conditions with the customer.

Pneumatic conveying of bulk materials can be classified into several categories:

Low-pressure conveying systems where compressed air is provided by fans up to a pressure of 20kPa, and ejectors are usually used as the mixing device. Typical of this type of transport is a large ratio of air to the material and a high speed. 

Middle-pressure conveying systems - where blowers from 20 to 100kPa are used as a source of compressed air. Rotary feeders or special ejectors serve as the mixing system. This type of conveying systems is suitable for less abrasive materials where continuous operation is required. 

High-pressure conveying systems are run with a pressure from 100 to 800kPa with the use of compressors. Conveying is provided by standardised conveyors with a capacity from 33L up to 4500L. Due to the low ratio of air to the material, the material is conveyed at a low speed. This makes this type of conveying systems considerate of the conveyed material and the transfer pipes. For ""Full line "" high-pressure conveying systems or for hard-to-convey materials, aerators with air flow regulation are mounted on the piping. This equipment helps to optimise the consumption of air and the speed of material in the transfer pipes. 

Vacuum conveying systems, where vacuum is created by a vacuum pump, can be designed with a vacuum conveyor or individually based on customers´ requirements. For ""Full line"" high-pressure conveying systems or for hard-to-convey materials, aerators with air flow regulation are mounted on the piping. This equipment helps to optimise the consumption of air and the speed of material in the transfer pipes. 

All types of pneumatic conveying systems are designed based on specific customers´ requirements and with regard to the material to be conveyed, economy of the investment, and subsequent operation and maintenance needs. 

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Pneumatic conveying

Conveyors for high-pressure pneumatic conveying systems

The conveyors are designed for pneumatic conveying of dry free-flowing bulk materials. The conveyors are designed with regard to the given application, transport capacity, transport distance and characteristics of the material to be conveyed.

Uniform pressure in the top part of the container ensures gentle transport of materials and transport efficiency. Conveyors of all sizes have their cone adjusted to make it easy to empty the conveyed material. The conveyors come with all the necessary valves, an outlet neck and an inspection opening. Nozzles for easier discharge come as standard. 

As standard, the conveyors are made from structural or stainless steel with maximum operating pressure of 8 bar, and are intended for materials up to a temperature of +100°C.

How do conveyors work...?

To start the filling cycle, the filling and purge valves need to be open. The filling cycle is completed when the filling valves close, followed by the purge valves. The conveyor is then pressurised by compressed air or inert gas which helps to feed the material into the transfer pipes. As soon as the conveying cycle is completed, the air pressure drops, and the air inlet is closed automatically. The conveyor is then ready for another conveying cycle. 

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TPS conveyors

Dust-free, enclosed system Robust structure Versatile use Low running costs Very low maintenance

TPS conveyors

Vacuum conveyors

Vacuum conveyors can be successfully used for conveying bulk materials for up to 30m at a maximum throughput of 9t/hour. This method is suitable for transport from small funnels, bags or barrels in order to charge material into manufacturing equipment or mixers. 

The material can be sucked manually by the operator or by means of a suction tube, or automatically from the hopper at the outlet of which the suction valve is installed. 

The advantage of vacuum conveyors is the fact that only a supply of compressed air at the required quality and quantity is required for their operation and that there is no need to use other devices, such as a vacuum pump etc. 

As standard, vacuum conveyors are made from stainless steel in combination with silicone seals and an anti-static filter thanks to which they can be used safely in operations with strict hygiene requirements.

Vacuum conveyors can be controlled via an air or electric control unit.

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VTC vacuum transporter

Separate suction units VTC vacuum transporter

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