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Applications

Power station technology

Power stations: Conditioning of Ash and Dust

The usage of mixers in the conditioning of ashes and dusts is well established and a proven technology at AVA.

The processes are highly developed in many years of practical application and the machines have proven themselves countless times. Nevertheless, new process tasks occur also in this market segment. The manufacturers of mixing and drying technologies are working on the solutions such as the reduction of limit values for dust emissions. The individual requirements of the customer in relation to the corresponding design of the mixer or dryer are always in the focus of solving matters during the project.

Depending on the process, AVA mixers for continuous or batch operation are used in brown coal or black coal power plants, in biomass or waste incineration plants, in de-dusting plants, e.g. for steelworks, or in coking plants. Thereby dust and ash from the filters of incineration, de-dusting and drying plants are no longer a waste product. They are leached out, humidified or solidified. The result is a final product for landfill, a transportable or recyclable material, which is used for example in road construction or as a cement additive. The conditioned product must have a defined level of stability and specific eluate values may not be exceeded. In addition, ash and dust of all kinds are used as dry product for the conditioning of sludge, filter cake or, for example, fed back into the process as a granulate in the steelworks industry.

Advantages of AVA technologies in the field of ash and dust treatment

No clogging / caking of the mixer, even after longer periods of operation
No manual cleaning of the mixer required
Short mixing times and high capacity reserves due to large active surface of the mixer shovels
Automatic re-start of the agitator even after long shutdown periods
High level of back-mixing the product inside the machine, therefore deviations in product dosing relating to grain size and apparent density are compensated
A higher residence time in the mixer can be achieved by means of a special shovel design.
A considerably better overall homogeneity with absolutely identical water content is achieved in combination with the high level of back-mixing
No usage of liquid jets, an inlet pipe is sufficient
Due to the slight vacuum from inlet to outlet, there is no risk of clogging the charging equipment
Robust mixer design, no cast parts in mixer
Lower energy consumption
Easy cleaning due to large inspection hatches

AVA complete solutions for ash and dust treatment

In order to reduce the number of interfaces, AVA supplies peripheral equipment for the core processes of mixing and drying. These include:

Process design of the overall process
Mixers and dryers for ash / dust conditioning
Conveying technology for dry products and liquid components
Silo technology
Controls engineering
Gravimetric and volumetric dosing systems (see details)
Discharge systems, e.g. in silo vehicles, open vehicles or containers
Wet scrubber technologies
Steel construction
Assembly, commissioning and start-up
After sales service

With mixers, dryers and plants from AVA for the conditioning of ash and dust, a technology is available which fulfils even the most demanding requirements.

Ask us for further details such as:

Advantages of AVA Technologies in comparison to ploughshare mixers
Advantages of AVA Technologies in comparison to twin-shaft mixers
Additional reference projects
Typical machine dimensions and capacities