drum dryer figures

rotary dryers | gea solid feed drying

rotary dryers | gea solid feed drying

GEA's range of Rotary Dryers are extensively used throughout the process industries and are highly reliable under the most arduous operating conditions. Noted for their process flexibility and robust construction, their design permits the use of the highest possible drying temperatures and in contrast to other dryers, are not sensitive to wide fluctuations in throughput and product size.

GEA's range of Rotary Dryers are extensively used throughout the process industries and are highly reliable under the most arduous operating conditions. Noted for their process flexibility and robust construction, their design permits the use of the highest possible drying temperatures and in contrast to other dryers, are not sensitive to wide fluctuations in throughput and product size.

The efficiency of the dryer is largely dependant on the differential between the inlet and exhaust gas temperatures, although the heat transfer rate is also influenced by the relationship between the design of flights and the speed of rotation. However, irrespective of the gas and material temperatures the drying (or residence) time may be critical, as this is governed by the rate of diffusion of water from the core to the surface of the material.

For greater thermal efficiency and where inertization is required, recycling of exhaust gases can be used. This can be implemented on all our airstream drying systems and retrofitted on customer's existing drying operations.

The wet material is in contact with the gas at its highest temperature, which rapidly evaporates surface moisture. The initial heat transfer rate is high, causing an immediate and considerable drop in gas temperature, which prevents overheating of the material and the dryer shell. The final product is in contact with the gas at its lowest temperature, enabling the moisture content to be readily controlled, usually by maintaining the dryer exhaust gas temperature at a pre-set value.

Initial heat transfer rate is high, causing an immediate and considerable drop in gas temperature, which prevents overheating of the material and the dryer shell; co-current dryers are particularly suitable for drying materials containing a high moisture contentEnables the moisture content to be readily controlled

Counter-Current Rotary Dryers are more suitable for materials that must be dried to very low levels of moisture, where the last traces of moisture are difficult to remove, or where an elevated product temperature is desirable.

They are also used effectively as combined dryer / preheaters. However, since the final product is in contact with the gas at its highest temperature the counter-current dryer is often unsuitable for heat sensitive materials. Although this system can be more efficient, moisture which is to remain in the product, is not so readily controlled.

Suitable for materials that must be dried to very low levels of moisture, where the last traces are of moisture are difficult to remove, or where an elevated product temperature is desired. Often used as a combined dryer/preheater.Enables the moisture content to be readily controlled

GEA is one of the worlds largest systems suppliers for the food, beverage and pharmaceutical sectors. The international industrial technology group specializes in machinery and plants as well as advanced process technology, components and comprehensive services. With more than 18,000 employees, the group generated revenue of more than EUR 4.6 billion in fiscal year 2020. A major focus is on continuously enhancing the sustainability and efficiency of customers production processes. GEA plants, processes and components help achieve significant reductions in carbon emissions, plastic use and food waste in production worldwide. In this way, GEA makes a decisive contribution toward a sustainable future, fully in line with its corporate philosophy of engineering for a better world.

advanced control of a rotary dryer - sciencedirect

advanced control of a rotary dryer - sciencedirect

Two kinds of intelligent, hybrid control systems for a rotary dryer are presented. The main controlled variable is the output moisture of solids and the main manipulated variable is the input temperature of drying air which correlates to the fuel flow. The main disturbances of the process are the input moisture of solids and the feed flow. The one discussed control system includes a fuzzy logic controller (FLC) and a PI-controller and the other a neural network controller and a PI-controller. In both cases the intelligent controller determines the set point value to a PI controller. The control results have been examined both with simulations and with pilot plant experiments.

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