Non thermal material drying
WHAT WE DO
Bergaz non-thermal drying technology offers the most cost effective, safest and cleanest method to remove surface moisture from industrial materials ranging from iron ore to sand. With only one pass through the patented Boundary Air Laminar Flow technology, Bergaz systems are capable of removing most of the surface moisture of the product being processed.
HOW WE DO IT
A rotary lobe positive displacement blower is used to generate high velocity low pressure air. As the wet material enters the patented pump chamber via a horizontal auger, it encounters a very high velocity of air coming from the blowers. In the chamber the media and high velocity air mix in an environment of near absolute zero pressure, and temperature near 100 degrees Fahrenheit (heat from the blower). Due to the very low pressure, temperature, and triple point of water moisture simply evaporates from the media. From here the product travels to the second stage if required via a specially designed cyclone. The configuration of each stage and the acceleration chamber creates a dilute phase transfer pressure drop that extracts the surface moisture off of the product thereby saturating the air with water vapor. Each stage creates vacuum forming the “boundary air/laminar flow” in which the product is transported.
System Qualities: The amount of product surface moisture that can be removed with a Single Stage of Laminar Drying is typically 6% to 10% depending on the product particle gradation and hydroscopic characteristics of the material. Multiple Laminar Dryers and Pumps can be connected in series to economically non-thermally dry products with excessive moisture.
In Non-Thermal drying, product temperatures reach about 120 degrees F. in the final drying stage.
There are no moving parts or power requirements for the Laminar Cyclone Dryers. Ceramic inserts are available for Laminar Dryers in very abrasive applications.
Non-thermal material drying - iron ore fines
View our iron ore presentation in PDF format here.
Non-thermal material drying - sand
Question: What materials can be dried using the Bergaz systems?
Answer: Bergaz systems are designed to dry any granular product from 2 microns to 25 millimeters. Products we regularly dry include; iron ore, sand, coal fines, food products, etc.
Bergaz systems are used commercially to dry and transport sand, garnet, coal and more. Other materials tested successfully include graphite, copper concentrate and diatomaceous earth.
Question: How much material can I treat per hour?
Answer: It depends on particle size and particle density of the material being treated. Systems sold vary in size between 5 tph to 285 tph, and designs for current projects in various study stages vary between 50 tph and 2000 tph. The current largest rotary lobe blowers support up to ~700 tph. solved by using multiple blower units in parallel.
Question: How much moisture can the Bergaz system remove from my product?
Answer: In a single stage Bergaz system 6-10% of the surface moisture can be removed. However, multiple stage systems can be engineered to economically dry products with excessive moisture. A triple-series system was developed/built in 2020 to remove 30% moisture for a client, reducing total moisture from 45% to 15%.
Question: What are the power requirements for a Bergaz system?
Answer: One of the most intriguing qualities of the Bergaz system is that it requires a fraction of the energy required by other drying methods. Contact us for more specific answer regarding power needs for your application as it depends on scale, particle size and density.
Question: Can the Bergaz system perform dry beneficiation?
Answer: Yes, the Bergaz system can perform dry beneficiation. After drying the raw material to a free-flowing dry state the primary cyclone vortex finder can be adjusted to produce different product streams based on size/density (hydraulic diameter).
Question: Is the offgas stream clean?
Answer: The primary cyclone overflow can be completely clean, or may contain some fugitive dust dependent on raw material properties. Local emissions regulations vary, and suitable gas cleaning systems as simple as a second cyclone with opacity measurements, or as complex as a venturi scrubber, multiclones and extraction fan can be designed/recommended for your application and location.
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