Belt dryer BT for SSW
in Poland
Dryer type: BT 1-6200-12
Dryer output capacity:
SSW: 10.0 t/h from 35% to 10%
5th stela belt dryer with waste heat utilisation for SCHWENK Zement
SCHWENK Zement, Germany
Sector: Cement industry
Challenge: At the Allmendingen site, there was actually not enough space for the BT belt dryer. SCHWENK chose the BT type again due to its good experience with stela dryers at other locations. A fundamental redesign of the dryer was therefore necessary.
Solution: : The exhaust air fans were placed behind the dryer in an atypical way and connected with ducts running under the dryer.
Dryer used: Belt dryer type BT 1-6200-13.5
Product to be dried: RDF (Refuse Derived Fuel)
Challenge
Space conditions require redesign of the belt dryer
The SCHWENK cement plant in Allmendingen was pursuing the goal of better utilising the previously unused waste heat from the production process, i.e. the heat that escapes without further use. At the same time, the company planned to efficiently dry the RDF substitute fuel in order to increase the calorific value and optimise combustion
Solution
Efficient use of waste heat from clinker cooling
To compensate for the lack of space, the exhaust fans were placed behind the dryer and connected to shafts running underneath the belt dryer. This customised solution allowed the dryer to be integrated despite the difficult space conditions.
In addition, the dryer was built on a raised strip foundation 2 metres high to ensure the necessary infrastructure. The belt dryer utilises the waste heat from the clinker cooling system. One third of the hot air was previously released unused into the environment. The dried substitute fuel RDF (Refuse Derived Fuel), which consists largely of shredded plastics, serves the cement plant as an environmentally friendly alternative to coal in the rotary kiln.
Manufacturing and assembly
The belt dryer was manufactured at the STELA Laxhuber factory. The individual components of the dryer were manufactured there to the highest quality standards.
Assembly at the Allmendingen site was carried out in close co-operation with SCHWENK. The specific requirements and local conditions were also taken into account during assembly. This included adapting the installation to the available space and integrating it into the existing energy supply system. Thanks to the precise planning and implementation, in which all installation steps were defined in detail in advance, the dryer was installed and commissioned on schedule.
Conclusion and outlook
As one of the most renowned German cement manufacturers, SCHWENK Zement places extremely high demands on the reliable and consistent quality of its end products. This is guaranteed by the precise control of the belt dryer's drying parameters. With the successful implementation of the belt dryer at the Allmendingen site, every SCHWENK site now has a stela belt drying system. These include Bernburg, Karlstadt, Heidenheim-Mergelstetten and Broceni/Latvia.
The latest project is part of a comprehensive energy optimisation concept that SCHWENK is implementing at the Allmendingen site. In addition to the RDF dryer, the overall concept also includes an ORC system to generate its own electricity and a downstream hot water treatment system using waste heat. According to SCHWENK Zement, these measures will save over 8.5 million kWh of energy per year and avoid more than 13,200 tonnes of CO₂ emissions, making an important contribution to environmental protection.
The investment illustrates how important sustainable climate protection and resource conservation are to SCHWENK.
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Our references
Belt dryer BT for RDF
in Latvia
Dryer type: BT 1-6200-13.5
Dryer output capacity:
RDF: 7.7 t/h from 25% to 3%
Contact person
Low temperature, continuous dryer, circulating dryer – not sure what’s the best choice for you? Our experienced colleagues will be happy to help you find the best solution for your product. Please feel free to contact us without obligation.
Telephone +49 8724 899-10
Email sales[at]stela.de
