Cold recycling

Cold recycling

Economical and resource-saving: Not only does recycling protect limited resources, it also significantly lowers costs while increasing efficiency.

As a competent partner, BENNINGHOVEN offers a wide range of products in the area of RAP feed systems. For cold feed systems, we can already achieve up to 40% RAP content with different technologies, from addition to the dryer drum or mixer feed to multivariable dosing –

whether on our own plants or on third-party plants, whether for retrofitting or expanding an existing hot feed system to maximise flexibility.

Middle ring feed system

The middle ring dosing system allows up to 25 % recycling material to be added.

Retrofitting on existing systems from all manufacturers is possible without problems. Large quantities of RAP material can be used with the midlle ring feed system. The material is introduced into the dryer drum with a belt and a ring elevator, mixed with the virgin mineral and heated gently.

BENNINGHOVEN has designed a special solution to avoid caking in the drum and the chutes. The generated coarse filler from the dedusting system is used to coat the RAP material with the aim of improving the transport characteristics of the heated RAP material through the asphalt mixing plant (reduces adhesions).

Highlights

> Dosing of up to 25% RAP material possible
> Easy retrofitting on existing plants, regardless of the brand
> Gentle heating of the material in the dryer drum

Middle ring dosing system

1. RAP collecting/inclined conveyor
2. Transfer unit (hopper)
3. Conveyor belt
4. Knife gate valve
5. Dryer drum
6. Filler blow-in unit

Dosing system into the mixer

For dosing into the mixer, up to 30% RAP material can be added depending on composition, quality and moisture content.

Retrofitting on plants from any manufacturer is possible without problems. Large quantities of RAP material can be added with the mixer feed.

The RAP material is conveyed directly from the feed hopper to the mixer level with an inclined conveyor or alternatively with a space-saving elevator. Dosing is carried out with belt scales so that a precisely defined RAP volume is fed into the mixer through a chute.

Highlights

> Dosing of up to 30% RAP material possible
> Easy retrofitting on existing plants, regardless of the brand
> Dosing with belt scales
> RAP material is added directly into the mixer with an inclined conveyor or a RAP elevator.
> The RAP elevator is a space-saving alternative to the inclined conveyor.

Dosing system into the mixer

1. Bucket conveyor
2. Drive with service mode
3. Chute with wear lining and service cover
4. Overfill protection
5. Conveyor belt with belt scales and belt cover
6. Pneumatically actuated flap

Multivariable dosing and variable dosing

The multivariable dosing system allows the addition of 40% RAP material – the highest possible ratio for cold recycling.

Compared to the variable dosing system, the multivariable dosing system can be used not only for adding RAP material, but also for adding bulk materials or additives. The additional weighing belt allows for exact dosing of these substances. In addition to the powder and granulate feed systems, this offers another option of introducing additional substances into the mixing process.

The RAP material is conveyed directly from the feed hopper to the mixer level with an inclined conveyor or alternatively with an elevator. A RAP quantity defined in the mixing recipe is added to the mixer in portions. Highly precise weighing technology allows for very exact dosing. Gentle, cyclic addition prevents strong hydraulic shocks during water expansion and is therefore gentle on the material and the components.

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Highlights

> Addition of 40% RAP material possible
> Smooth, sequential loading of the mixer prevents hydraulic shock during steam expansion.
> Exact dosing with high-precision weighing equipment
> Gentle on material and components
> Highest possible dosing capacity of cold RAP
> Dosing option for all non-adherent bulk materials, e.g. Trinidad asphalt, rubber granulate

Multivariable dosing system

1. Bucket conveyor / 2. Drive with service mode / 3. Chute with wear lining and service cover / 4. Overfill protection / 5. Buffer container (3 t, 4 t *) incl. level indicator / 6. Frequency-controlled feeder belt / 7. Frequency-controlled weighing belt and belt cover / 8. Chute with wear lining and service cover / 9. Pneumatically actuated flap

* in combination with the hot recycling system

Variable dosing system

1. Bucket conveyor / 2. Drive with service mode / 3. Chute with wear lining / 4. Maintenance cover / 5. Overfill protection / 6. Buffer container (5 t, 6 t *) incl. level indicator / 7. Buffer container, lower section / 8. Frequency-controlled conveyor belt with belt scales and belt cover / 9. Chute with wear lining and service cover / 10. Pneumatically actuated flap

* in combination with the hot recycling system


Benninghoven value

Using technology to work towards a more efficient use of energy and raw materials is the challenge of today and tomorrow. Solutions from Benninghoven can support the reduction of energy consumption and emissions while enabling asphalt mixing plants to run with a high reclaimed asphalt pavement (RAP) content to ensure the future of the facility.

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BENNINGHOVEN technologies

Asphalt production, recycling systems, combustion technology, control systems and bitumen technology – with BENNINGHOVEN technologies, every customer can find the right solution for their location, according to the specific requirements and conditions.

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