Engineering

Pneumatic transport of bulk materials

Pneumatic transport of bulk materials

We offer studies, design and consulting in the field of pneumatic transport technology of bulk materials. We deal not only with the design of new pneumatic conveying systems but also with the assessment and modernization of existing pneumatic conveys. At present, most coal-fired power plants and heating plants, foundries and cement plants are equipped with electrostatic filters to separate fly ash and various dust fractions from flue gases. These devices are no longer powerful enough due to the ever-tightening limits for separating these dust particles from the flue gas stream, and therefore most of these devices are transformed into more efficient fabric filters. Conversion of the electrostatic precipitator to a fabric filter also entails an assessment and, if necessary. reconstruction of existing pneumatic conveying of materials located under the hoppers of these sources.

The study is prepared by our engineering division, see the contact.

Pneumatic transport is a closed transport system designed for the transport of bulk materials from tens to hundreds of meters with a transport capacity from units of kilograms to tens of tons per hour. Pneumatic conveying can be used in almost all industries. Although its use is very extensive, individual installations cannot be unified and it is always necessary to look for the optimal type of pneumatic transport for the given conditions with the customer.   In pneumatic transport, air or an inert gas (CO2, N2) or air with a reduced O2 content is used as a possible medium for transportation.   The division of pneumatic transport can be done from several points of view. It is most often divided according to the pressure of the transport medium into:
     
  • Vacuum
  • Overpressure
  • Mixed (combination of the two previous)
According to the difference between the pressure in the pipeline and the atmospheric pressure, pneumatic transport is distinguished for vacuum and overpressure transport:
     
  • Low pressure (pressure difference less than 10 kPa) - the source of compressed air is fans up to 10 kPa and the mixing device is usually ejectors. Transport is characterized by a high ratio of air to material and high speed.
  • Medium pressure (pressure difference 10 kPa to 50 kPa) - the source of compressed air of the blower in the range of 10 to 50 kPa. The mixing devices are rotary feeders or special ejectors. This type of transport is suitable for less abrasive materials with a requirement for continuous operation.
  • High pressure (pressure difference 50 kPa to 800 kPa) - is operated in the pressure range of 50 to 800 kPa using compressors. Special standardized chamber feeders with a volume of several litres up to 8000 litres are used for transport. Due to the low ratio of air to material, the material is transported at low speed. As a result, this mode of transport is gentle on the material to be transported and the transport line.
The use of individual transports depends on the requirement of performance parameters, distance, the grain size of the transported material and other properties and configuration of transport routes.   Low-pressure transport is usually transport:
  • Ejectors
  • Mixers
  • Aeration troughs
  Medium-pressure transport is usually transport:
  • Mixers
  • Aeration troughs
  High-pressure transport is usually transport:
  • Chamber feeders
  • Screw conveyors