Pneumatic dense phase conveying

Pneumatic dense phase conveying systems for powders and granulates with pressure vessels are favored against lean phase conveying systems with rotary valves wherever one of the following criteria is important:

- The products have a fragile surface structure and must be transported without any damage. Together with the actual minimizing of the destruction of the product it can also be important to prevent fines generated by the attrition of the product during the transport, because these fines can have a tendency to coat the pipeline with product caking. Examples: milk powder, fat powder, salt, sugar, plastic granulates, chemical intermediate and end products
- Mixtures should not segregate trough the transport: Examples: coffee powder mixtures, cereal mixtures, mortar mixtures
- The product is abrasive, meaning that there is danger of high wear of pipelines and of the installed components. Examples: sand, alumina, coke
- The consumption of air and thus the corresponding operating energy costs has to be reduced. Above all, if the conditioning of the conveying medium is very complex (e.g. absolute dry and clean air or nitrogen as conveying medium)

The Gericke dense phase conveying systems can be operated with air starting velocities from 2 m/s depending on the product and on the application, in comparison to lean phase conveying systems with starting velocities from 20 m/s. The solids loading (= amount of kg of product that can be transported with 1 kg of conveying medium) in dense phase conveying systems can reach up to 150, whereas in lean phase conveying systems the solids loading usually lies in the range of 5-10.

Depending on the application Gericke chooses from several operation modes (plug conveying type PTA, plug conveying with external bypass air type PTA PL, dune or layer conveying) the best suited conveying system. The pressure vessels and the additional components are custom-designed and hygienic as well as wear and heat resistant executions can be delivered. The pressure vessels as single vessels are operating in a batch-cycle. For a continuous transport a double-vessel system is used, which gives using the same pipe diameter an increased capacity and require less height. Gericke conveying systems are used in all bulk material processing industries for a very broad product range from A as adipic acid to Z as zeolite.

In our Test Centers all different kinds of pneumatic conveying systems can be tested to gain the exact conveying parameters. From tests also knowledge of product quality (attrition) and of possible product caking in pipelines is gained. Besides the Test Centers Gericke also offers to customer to use rental machines to be tested directly on site.

For more information, please consult our websites www.gericke.net.