The ZANNI combustion grate
The services in detail
The advantages of ZANNI combustion grate technology lie in the details.
It offers enormous potential for the combustion process!
The grate surface is very large and the supply of combustion air within the combustible materials is optimised. This is because the residence time of the combustible materials can also be easily controlled by skilfully supplying the required oxygen to the waste.
Maximum control of the combustion process.
An extension of the time can be achieved with minimum effort.
Multi-medium incineration grate
Due to its design, the ZANNI combustion grate is suitable for solids and sludge.
Solids can be, for example, municipal waste, industrial waste, clinical and other contaminated waste.
Solid waste can also be mixed with liquids.
Sludges can be oily sludges, sewage sludge and others.
The criteria for the amount of waste sent for incineration are the composition of the combustible material and thus its calorific value.
Functionality of the system
The heat-resistant steps of the grate are equipped with air impulse slots as a kind of nozzles.
The air swirls into the combustible materials in large quantities and conveys them along the grate.
The swirled combustion air turns the combustible materials around, breaks them up and supports the entire combustion process.
This also achieves a high throughput rate per unit area of the grate.
The system allows the user a flexible selection of load cases.
Depending on the application and, above all, on requirements, either mass throughput or dwell time can be selected.
Everything can be controlled by the air flow rate and the air pulses.
This is a huge step forward in combustion technology.
Characteristics
- Multi-medium combustion grate,
- suitable for solids and moist sludge (residual moisture max. 25%), such as sewage sludge,
- no moving parts,
- dynamic and efficient,
- high throughput rates,
- low investment costs,
- low operating costs,
- low maintenance costs,
- simple replacement.
Residual moisture simply summarised
Residual moisture simply summarised
It is quick and easy to explain why the residual moisture of sludge needs to be reduced:
Increased emissions of pollutants
Incomplete combustion leads to increased emissions of pollutants such as dust, carbon monoxide, sulphur dioxide and hydrogen chloride.
Lower combustion temperature
The combustion temperature drops if the water content of the sludge is too high. This can lead to incomplete combustion and the formation of soot.
Slag formation
The slag produced during the incineration of sewage sludge can lead to problems during storage and disposal if the residual moisture content is high.
Pre-drying to improve the incineration process
To ensure optimum incineration of the sludge, the sludge is usually dried before incineration. In this way, the residual moisture can be reduced to the desired value of 25%.
Further useful information
Residual moisture
The residual moisture of the sewage sludge can vary depending on the process and plant.
Requirements
The exact requirements for the residual moisture are defined by the local regulations and the authorisation notices of the individual plants.
Drying process
There are various methods for drying sewage sludge. Depending on the requirements and local conditions, these can be, for example, drum dryers, belt dryers or fluidised bed dryers.
