STELA | Low-Temperature Drying FAQs

Questions and Answers about STELA and low-temperature belt drying.

Below are quick and clear answers to some of the most commonly asked questions.

Can STELA's drying systems be customized for specific industry needs?

Yes, we offer tailored solutions to your specific industry requirements, including drying of biomass for pellet production or renewable fuels in pulp and paper, recycling and wastewater treatment and much more.

How can STELA enhance waste heat utilization in my business, and is it required for the drying process?

STELA’s drying systems are strategically crafted to capitalize on waste heat from your business’s other processes, effectively integrating it into the drying cycle. However, it’s important to note that our technology does not depend on waste heat to operate. We ensure optimal performance to leverage any available thermal energy at site

Is waste heat necessary for STELA's drying systems to operate?

No, waste heat is not a prerequisite for our drying systems to function. 

Where are STELA's drying systems manufactured?

The dryers and control cabinets are manufactured entirely in our factoring in Massing, Germany, with STELA producing over 80% of the components in-house.

What are the advantages of using low-temperature belt drying for processing biomass materials?

Low-temperature belt drying offers significant benefits for processing biomass, which includes organic materials like wood chips, agricultural residues, and energy crops used for biofuel production, animal feed, and other applications.

By utilizing lower temperatures, it also ensures that the valuable properties of the biomass—such as nutrients in feedstock or energy content for biofuels—are preserved.

How does low-temperature belt drying differ from traditional rotary drum methods in terms of efficiency and environmental impact?

Low-temperature belt drying significantly outperforms traditional rotary drum methods by offering superior energy efficiency and a lower environmental impact. The technology allows for the utilization of waste heat, thereby reducing energy costs. Additionally, it operates at lower temperatures, which minimizes emissions and contributes to a reduced carbon footprint.

What advantages do STELA's low-temperature drying systems offer across various industries?

STELA’s low-temperature drying systems are tailor-made for a spectrum of industries that demand energy-efficient and gentle drying processes. By leveraging our low-temperature systems, businesses not only achieve superior drying but also contribute to a greener footprint in their operations.

How do STELA's drying technologies contribute to carbon footprint reduction?

Our systems are designed for optimal energy efficiency and waste heat recovery, which significantly reduces greenhouse gas emissions and thereby minimizes your carbon footprint.

What does the installation process entail and is training provided?

The installation process is meticulously planned to ensure minimal disruption to your operations. Once installed, comprehensive training sessions are conducted by our experts to equip your team with the knowledge and skills required to operate and maintain the system effectively.

What are the long-term cost benefits of implementing a STELA drying system?

Due to the energy-efficient nature and low maintenance requirements of our systems, businesses can expect to see a significant reduction in operational costs over the long term.

Belt Dryer Operations Q&A

Answers to common questions about the functionality, maintenance, and efficiency of our low-temperature belt dryers. Whether you’re curious about the installation process, operating costs, or the technological advantages of our dryers, this resource is designed to provide you with detailed insights. 



What are the dryer's most critical wearing parts?

Essential wearing parts include the conveyor belt, pressure sensors, and idler bearings.

How long can the dryer operate without interruption?

The dryer can run continuously for 2,000 to 2,500 operating hours.

What are the expected annual maintenance costs?

Maintenance costs annually are approximately 1% of the initial purchase price.

Can the conveyor belt be replaced by the user, and what is the time requirement?

The belt can be replaced by users, typically requiring 4 to 6 hours with a two-person team.

Is it necessary to empty the dryer for product changes?

There is no need to empty the dryer when transitioning between products.

What is the typical installation duration for the dryer?

Installation duration is dependent on dryer size; STELA provides tailored advice.

How much water is required for the belt's wet cleaning process?

Wet belt cleaning uses approximately 35 to 70 cubic feet (1 to 2 cubic meters) of water per week.

Is manual operation needed for the dryer?

The dryer operates fully automatically, eliminating manual operation.

What type of thermal energy is compatible with the dryer?

Thermal energy requirements depend on the dryer’s design; consult STELA for specifics.

What's the range of drying temperatures achievable?

Drying temperatures range from 140°F to 248°F (60°C to 120°C).

What is the expected product temperature at the outlet?

The product typically exits at temperatures below 104°F (40°C), due to the gentle drying process.

What is the service life of the belt?

With over 25 years of experience, the belt can last for up to 40,000 operating hours.

How does RecuDry optimize efficiency?

RecuDry enhances efficiency by recycling condensation heat from exhaust air to warm incoming air.

What materials are utilized in the belt dryer's construction?

The dryer’s main components and vapor-contact parts are constructed from stainless steel and aluminum.

What are the comparative energy consumption values to traditional drum dryers?

 Energy consumption varies by dryer size; STELA provides detailed comparisons upon request.

How should the condensate from RecuDry be managed?

The condensate from Recu Dry is purified, neutralized, and reused before disposal via the wastewater system.

How is the wash water from wet cleaning processed?

Wash water from the belt dryer is safely discharged into the wastewater system without issues.

Does STELA integrate an exhaust air filter within the dryer?

The belt features a unique weave that functions as a self-renewing belt filter.

How is VOC emission controlled in the drying process?

The low drying temperatures result in minimal VOC emissions.