Combustion furnaces

The heart of every plant is of course the combustion chamber, with its grate and combustion system philosophy.
For this, all parameters of the combustible material are taken into account, as well as the question of sustainability in dealing with the waste.

Our combustion furnace has a two-chamber ceiling loading system consisting of a manual or optionally automatic chamber opening, together with a driven slide system to separate the combustion chamber.

Two burner systems are used to heat up the system and to support the firing at low calorific values of the waste. One burner system for the main combustion chamber and one burner system for the afterburner chamber. This is divided into two chambers. Depending on the setting, the combustion chamber temperature is 850 - 950 °C in the main combustion chamber and 950 - 1150 °C in the afterburner chambers. The firing temperatures are automatically controlled according to local specifications. An emergency system (pressure and temperature dependent) is available.

The ventilation of the main chamber is on the front side and is adapted to the patented combustion grate system. 

In the past, we have used old-fashioned technology that reliably fulfilled its tasks, but reached its limits in the area of wear and tear and also in maintenance. We took a closer look at these problems and created a new type of combustion grate that is easy to maintain and favourable in its manufacture and replacement, as combustion gratings are wearing parts.

The afterburner chambers are ventilated on the side. Ventilation is provided by one or more combustion air fans, the control of which is regulated by corresponding oxygen measurements to ensure sufficient oxygen enrichment and thus complete combustion.

The system contains 2 sight glasses into the combustion chamber as well as numerous connections and connection possibilities for necessary and additional measuring instruments.

The ash is removed manually via 3 large ash removal doors or optionally via an automatic wet ash removal system. 

Each plant is designed to meet the specific requirements and of course the highest environmental standards. 

We have a wide range of solutions available for this purpose.

Mid-sized incineration plants as an example of a sustainable investment

Key figures

  • Up to 400 kg/hour capacity.
  • Patented grate system.
  • Suitable for all types of waste, such as clinical waste, contaminated materials, other solid and sludgy wastes, like sewage sludge.
  • Automatic control systems.
  • Manual feeding via top loading device (closed chamber system).
  • Manual ash removal.
  • Large side chamber doors, also usable for revision access.
  • Inspection opening at the front for easy replacement of the combustion grate.

Optional system components

  • Automatic feeding possible.
  • Automatic ash removal possible.
  • Liquid injection possible.
  • Patented Air/Air cooler for an easy and quick change of the tube bundles.
  • Wide range of adaptation options for filter systems and flue gas cleaning possible.
  • Heat recovery and energy generation possible.

If you want to know how a plant could be configured in detail and which plant components are required for this purpose, then take a look at our Flow sheet page and find out everything about efficient incineration plants!

Mid-sized incineration plants as an example of a sustainable investment
Download the technical data sheets of the combustion furnace, the flue gas cooler and the filter system as PDF file
Example of a modern Mid-sized stationary combustion plant.pdf (248.48KB)

An example combustion furnace for a first impression

RDF (Refuse Derived Fuel) *

Mix of clinical waste, paper and fabric residues, polymers, other solid and sludgy waste fractions, like sewage sludge.

* only for sample

RDF quantity

400 kg/h

Average calorific value of RDF

15000 kJ/kg

Average ashes from RDF

10,8 kg/h

Temperature main combustion chamber (MCC)

850 °C

800 – 900 °C

Temperature post combustion chamber (PCC)

1100 °C

950 – 1150 °C

Ambient temperature

25 °C

Pressure MCC/PCC

-2 mbar

Pressure combustion air

5 mbar

Combustion / ventilation air **

2687 Nm³/h

** Grate ventilation

Flue gas wet

3019 Nm³/h ***

*** Nm³/h means cubic metres (m³) @ atmospheric pressure (1013,25 hPa) and a standard temperature (0 °C) per hour (h)

Flue gas outlet

15215 Bm³/h ****

**** Bm³/h means "actual" (B) cubic metres (m³) per hour (h) @ operating pressure, temperature and humidity

Residence time flue gas

2,5 s min.

Thermal Energy from RDF 

1667 kWh

Average emissions from RDF *****

***** Before cooler and  filter system 


276 Nm³/h ***


0,82 Nm³/h ***


2139 Nm³/h ***


371 Nm³/h ***

Dimension of incinerator ******

****** Mounting parts and aggregates not considered


6000 mm


2500 mm


2800 mm

Flue gas cooler

Please see also our example of a flue gas cooler

Flue gas from combustion furnace

15215 Bm³/h ****

Flue gas temperature

1100 °C

Flue gas filter system

Please see also our example of a filter system

Flue gas inlet

5240 Bm³/h ****

Flue gas temperature

200 °C

Subject to change.
Sample data only.
Changes to individual parameters can affect all values!

Everything you need to know about other components

Of course a system could also includes other components, such as;

  • Pipelines,
  • Emergency and primary chimneys,
  • Additive systems,
  • Filter systems (bag filter or ceramic filter systems),
  • Suction and fresh air blower,
  • Sensors and control systems,
  • Conveyor belts,
  • Exhaust gas monitoring system,
  • and other plant components,

partly included, partly optional, depending on the individual configuration of a plant.

However, these are to be planned individually, if necessary also locally available and therefore not part of a general presentation.
Of course we can offer everything turnkey ex works.

To protect the environment and to avoid unnecessary transports we would like to point out our license option. 
The conditions for this are currently being worked out and in the moment in a stage of discussion.

Let's talk about it.
Thank you.

These pages, flyers and brochures might also be of interest to you:

Equipment for a modern incineration plant
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Flow sheet and components of a stationary incineration plant

ZANNI combustion grate for all types of waste
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GRATE-SR10S 202020000952.pdf (1.82MB)

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ZANNI-GRATE.pdf (1.58MB)

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