Plant design for dry grinding

Various industries and products should take full advantage of the performance of our systems. Precise control with a user-friendly interface is of great importance when it comes to cost-effective capacity utilisation. With us, all essential measuring and control equipment are part of the standard equipment and converge in the Tietjen TCU controller for the grinding module. It is easy to integrate additional products from our company into higher-level automation solutions – we would be happy to take over the necessary individual adjustments.

Structural explosion protection that minimises the effects of an explosion is be-all and end-all for industrial companies in terms of safety. By researching and developing pressure relief systems, we have contributed to improving safety at grinding plants. All Tietjen mills and other components are explosion-proof, flame-resistant and designed for a reduced explosion overpressure of at least 0.4 bar. The decisive factor is the perfect interplay of the explosion-proof construction of our mills, our in-house pressure-relief valves as well as explosion decoupling. Because safety always originates in the system. Our protocols and work instructions, which we are happy to create as a service in tandem with you, will also help you with the documentation for the relevant authorities or departments. Regular inspections and the maintenance of your safety equipment allow us to guarantee the permanent functional safety of your plant.

Whether for piece goods or bulk material, in dry, liquid or gaseous form, the main requirement for conveyor systems is safe, careful and energy-efficient transport as well as precise dosing within a load-dependent process.
At Tietjen, we focus on our core competence: conveyor systems and dosing machines for systems to process natural substances. We offer mechanical, pneumatic or hydraulic transport.

Our hammer mills are considered reliable and durable. Tietjen has been synonymous with quality for more than 60 years. We have already delivered more than 2,100 systems for tailor-made plants worldwide and even added impact classifier mills to our programme in 2018. We have an exclusive partnership with NEUMAN & ESSER Process Technology GmbH for the fine grinding of fish feed and pet food. From simple self-feeding grinding systems for small operations to computer-controlled large chamber mills with automatic screen change for 24/7 operation. Fineness ranges from > 3 mm to 150 microns. The machines are in operation throughout the world under a wide variety of conditions. They are robust, built to be maintenance-friendly, and specially designed to be extremely energy-efficient to operate. Our drive power varies from 11 to 450 kW. Tietjen’s mills perform a variety of specific crushing tasks. We have the right mill for your product as well – contact us.

A grinding plant can only operate efficiently if it has the right feed and the feed material is appropriately dosed. Loading the product across the entire width of the hammer mill has a significant effect on the grinding process, ensuring carefree operation and enabling higher performance. In addition to feeding in the grist, our feeders control the supply of aspirated air while separating out foreign matter. We offer our customers three product lines with our R, DA and AGS feeders so that we can select the right feed-in system for you that corresponds to your structural situation and the desired product characteristics. We place your product at the heart of the plant design.

Aspirating a mill and removing the ground product are almost as important as the grinding itself. At Tietjen, we provide the appropriate in-house filtration and the right screw system or pneumatic conveying system for every application and type of mill. Process design and explosion protection are just as important as energy efficiency within the grinding system. That is why, here at Tietjen, we address different pressure and flow conditions in the grinding module, the incoming flow in the Tietjen filter, various filter materials and the optimal design of the filter – from the filter type and model to the individual nozzle for cleaning. We know that a system can only be as good as the quality or sum of its individual components.

The volume and shape of our Tietjen receptacle (also called a plenum or trimelle) are customised to meet your unique product characteristics, the mill used and the on-site spatial conditions. A tailor-made container is important to prevent bridging, ensure pressure shock resistance and guarantee a low flow speed towards the filter. It also serves as a frame for the explosion protection relief valves. Tietjen’s upstream containers are always individually tailored according to batch size. Below the container are the screws for the safe removal of the grist as well as the rotary valve for decoupling.

Tietjen’s milling systems are mainly used in mixed grinding. Mixing the grist into a homogeneous feed material is an important process step before grinding. The optimal mixture loads the mill evenly – for low-wear and efficient operation. While the premixer serves to produce a homogeneous product, the main mixer mixes the grist with the other additives or components that are not to be ground after the grinding process. Thus, it is prepared in batches for subsequent pelletisation or extrusion. Horizontal and vertical mixers are now part of our integrated dry grinding solution, as are sifters and sieves.