Discover the versatility and efficiency of HERBAS RSP 600 and RSP 900 cylindrical rotary dryers —a top choice for industries needing reliable and continuous drying solutions for significant capacities.

CONCEPT SPECIFICS

Cylindrical rotary dryers or rotary drum dryers are of continuous or flow type ensuring constant throughput. That means, material is continuously fed from one side and continuously exits on the other side. Traveling through the dryer, material is being mixed along the way ensuring even (equalized) drying. Furthermore, it is being poured over an airstream creating a specific pattern (“curtain”) that enhances drying. Therefore, material can be dried in less time with higher temperatures of air or exhaust gases and still not be deteriorated by it.

OPTIMIZING CAPACITY AND MAINTANCE

The drying capacity can be optimized and regulated with variable frequency drive (VFD) speed, heating power and feeding flow. Additionally, for specific cases and specific projects with angle adjustment, paddle type and dimensions. Because of it’s straightforward general concept and design, these cylindrical rotary dryers are above all reliable, easy to maintain and clean service.

THE INDIRECT DRYING

For grain, seed and pomace drying, the heat is indirectly applied to the material. Exhaust gases (fumes) are not contacting the material. The thermal generator HT (up to 160 kW) from HERBAS provides heated air. The thermal generator can run on biomass (wood chips, nut shells, pellets, etc.), fuel oil or gas. Additionally, electric heater, water-air or steam-air heat exchanger can be provided to ensure flexibility regarding unstable fuel prices, as well as promoting sustainability and renewable energy. Carefully regulated air recirculation and thermal insulation of the whole drying system results in energy-saving operation. There is great dual energy source option: electric heaters can run of solar or wind power plants, but you can also have coverage in the days when there is not enough sun radiation coming through clouds or wind souring through fields. That coverage comes in form of thermal generators on biomass, fuel oil or gas. Renewables are definitely a future to come, but because of their inconsistency, now they have a practical back-up!
Biomass solution can also be considered a sustainable solution if the resource is sustainably managed. Wood chips or pellets, nut shells, fruit or olive kernels, etc. are all great fuel options providing good combustion with relatively low ash percentage, that can also be affordable as well as environmentally friendly.

THE DIRECT DRYING

In the case of mineral or ore sludge drying (e.g. sand), wood chip or sawdust, the heat is directly applied to the material – that is exhaust gases are getting in direct contact with the material that is dried. These types of materials can endure very high temperatures, which enables very fast drying. A two-stage burner (fuel oil or gas) ensures energy-efficient operation and careful temperature regulation. Exhaust gases are expelled through the chimney. Additional fume filtration can be provided for environment protection reasons.

The interior of the drum can be made from stainless or carbon steel, depending on the request for the temperature, the direct or indirect heating, etc. In food grade, stainless steel is usually required, allowing easy washing and cleaning.

IF YOU NEED GUIDANCE, WE ARE HERE FOR YOU!
The HERBAS team offers consultancy in case you are interested in using aforementioned RSP dryers. Some design considerations, options and calculations usually need to be taken into consideration, that is where HERBAS team can support you on the journey of choosing the right solution and advise the best product our company can offer.

Key Advantages:

• High capacity: depending on the material, bulk density, moisture dynamics in the material, capacity can go up to several tons / hour
• Constant flow: continuous input and output for seamless production,
• Universal: Covering wide range of capacities depending on the product and adjustment parameters up to
• Dual energy source option: electric heaters + thermal generator on fuel oil, gas or biomass
• Energy-efficient design: completely thermally insulated and with air recirculation in case of indirect heating and direct heating in case of mineral drying
• Versatile: possible application for various materials and in various industries
• Customizable: through individual approach we assure the product meets your specific requirements
• Simple maintenance: durable and straightforward construction with low maintenance needs
• Long service life: very reliable with few moving parts
• Adjustable capacity: VFD (variable frequency drive) option, power regulation

Whether you’re processing minerals, chemicals, or agricultural products, our rotary dryer ensures uniform drying, energy efficient design, flexible energy source options, food-safe operation and optimal performance.

You can check our direct heating dryer RSP 600 with two-stage burner drying silica (quartz) sand.

You can check our indirect heating RSP 900 with dual energy system thermal generator + electric heater drying grape seed and pomace. With a length of 13 m, this dryer dries around 200 kg/h of grape seed and pomace. The 135 kW electric heater is used during sunny hours, while the 160 kW thermal generator offers back-up.

The next product from this line: Drying chamber with mobile floor