Pneumatic conveying

One of the most commonly used techniques for pneumatically conveying bulk goods is with air or gas.

Suction conveying (negative pressure)

In suction conveying, powders, pellets grain and granular materials are moved pneumatically, powered by suction in an air or gas stream. You can use it to convey your raw materials from one or more input points to one receiver or receiving unit. The pre-condition is that the raw materials should be dosed somewhat regularly. The advantage here is that additional air-cooling during conveying is often unnecessary.

For pneumatic suction conveying, the pump is mounted behind the receiver. The negative pressure in the system ensures that there is hardly any dust emission when opening flaps or connecting points. This is an ideal system for situations where there are very strict requirements for hygiene and a dust-free environment.

Positive pressure pneumatic conveying (with blown air or gas)

The pump is mounted at the front of this type of pneumatic conveying system to move powders, pellets grain and granular materials pneumatically, using a propulsive stream of air or gas. Blown air or gas allows conveying raw materials from one input point to one or more receivers. You can also select a particular receiver using a selector system, so that you receive the raw materials at the desired location. Blow conveying offers the additional advantage that it prevents penetration of dust and dirt into your production process.

Would you like to know more about blow or suction conveying and system integration with them?

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Dilute phase conveying

With a dilute phase, the material is pneumatically mixed with air or gas, so that it is ‘suspended’ during conveying. The outstanding characteristic of this system is its relatively high transport speed and low load factor, which contribute to minimal product damage. The relatively high air flow rate allows product drying and cooling during conveying.  A high-pressure fan/blower or vacuum pump is often used as the power source. The dilute phase conveying system is reliable and robust, and it is suitable for uneven product supply scenarios.

  • Transport length: up to approximately 700 metres
  • Maximum capacity: 50 tonnes per hour
  • Final gas speed: 20-30 m/s
Dilute phase transport

Dense phase conveying

In a dense phase conveying system, the raw materials move through the pipe in a 'plug’ form, with air or gas propelling the material. This type of conveying is characterized by relatively low transport speeds with low air/gas consumption. A medium-pressure compressor is often used as a source. We can distinguish two systems in this category.

  1. Dense phase with high pressure air-locks
    Thanks to the high-pressure air-locks, the bulk goods can be delivered through a conveying system even with high levels of pressure variation. The outstanding characteristic here is a high load capacity and low air/gas consumption. Conveying through high-pressure air-locks is ideally suited for a continuous production process with a requirement for minimal product damage.
  2. Dense phase with conveying vessels
    When moving materials with a conveying vessel , the product can be guided through the conveying system in various ways. This system is characterized by low speed, high load capacity and low air/gas consumption. Using a conveying vessel is suitable for products subject to wear and is a good fit in a discontinuous production system, in a dust-free environment. The system is free of rotating parts.
    • Transport length: up to approximately 700 metres
    • Maximum capacity: 50 tonnes per hour
    • Final gas speed: 4-15 m/s

Would you like to know more about dense phase conveying and system integration with it?

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Slow flow/Medium phase conveying

Hygienic, dust-free and compact operation with minimal gas/air consumption

The requirements with regard to hygiene, safety and efficient working are becoming increasingly strict for food, dairy product, animal feed, pet food and chemical companies. To formulate an adequate response to this, Dinnissen developed the special slow-flow conveying system, which is particularly suitable for continuous production processes. The focus is on fast and thorough cleaning, including the ultra-dust-tight closure of the conveyor system. The optimal ratio between the load and the transport air/gas results in relatively low transport speeds. This makes the system particularly suitable for fracture-sensitive, abrasive and fatty raw materials, such as milk powder, sugar, instant powders, sand, chalk, milk and cocoa.

With the slow flow concept, an extremely compact receiver system is sufficient, which is thus quick and easy to clean and can easily be integrated into new and existing situations. In addition to that, there is a low air/gas and energy consumption, which means that a compact air treatment system and a small air filter are sufficient.

If desired, the slow-flow conveying system can be cleaned automatically and made ultra-dust-proof. You can also opt for increased capacity. Other options include integrating highly accurate measuring and weighing equipment, creation of negative or positive pressure, using inflatable closures and automatic cleaning with air. A medium pressure blower is often used as the power source for generating the transport medium, alternatively a compressor with positive pressure at 0.2 - 0.5 bar.

  • Transport length: up to approximately 700 metres
  • Final gas speed: 8-18 m/s

Would you like to know whether the slow flow conveying system is suitable for your processes?

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slow flow

High care big bags filling

Closed loop conveying

A closed loop conveyor involves a closed system in which the transport medium, air, is replaced by an inert gas, such as nitrogen. The reason for this is that it creates an explosion and oxidation free conveying solution. For efficiency reasons, the installation is equipped with an innovative gas return system, which minimizes the gas consumption costs.

Would you like to know more about closed loop conveying and system integration with it?

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Optimization of your entire process

At Dinnissen we will be happy to help you automate and innovate your entire process with customized solutions. Dinnissen can add value in every process step. Take a look at our solutions for each step of processing powders, pellets grain and granular materials:

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