Rotary kiln equipment converts waste to energy

Seiler offers a wide range of Rotary Kilns for many applications, but particularly for waste incineration there are several styles, single or double stage, in a parallel or counter stream design

The advantage of a Rotary Kiln: As soon as it enters the system, the waste is thoroughly and constantly mixed by the rotating incinerator and at the same time, it is also continuously homogenized and ventilated.

Depending on local demands and regulations, post combustion temperatures may reach 850C (1,560F) to 1,200C (2,200F).

Wet waste is dried by the use of hot gases and the refractories of the cylindrical chamber.

To maximise the lifetime of the plant, no metal parts come in contact with the waste product or gas.

When to use a single stage rotary kiln? For the incineration of a waste mixture, where a good part of it is high calorific liquid waste to be burnt in the post combustion, the complete incineration of the solid and/or pasty waste is fully oxidised in the first stage, leaving the post combustion chamber for the reheat and incineration of the liquid wastes.

Due to the unique Seiler design, the plant can be shifted to a double stage design when needed.

A major design feature is that solid extraction takes place after and separately from the rotary kiln, this de-ashing function being common to all kiln types from Seiler.

The rotary kiln, the de-ashing installation and the post combustion unit can therefore be operated trouble free with greater flexibility and reduced maintenance costs.

What is the advantage of a double stage rotary kiln? The concept combines two, well proven principles - Pyrolysis and Rotary Kiln Technology - to produce a continuous, state of the art incineration process.

The equipment is simple to operate and requires minimal staffing, whilst at the same time, the cost effective design ensures that machine life and operational flexibility is maximised.

Solids, granules, pastes and liquids can be treated, the method being determined by the characteristics of waste such as humidity, calorific value and volatile particles.

Older incinerators, including those equipped with multiple zones, have only a one stage incineration.

This involves high temperature and an air intake which causes volatile particles (e.g synthetics) to ignite in the gas stream.

The Pyrolysis system has two stages, separated by the mixing chamber.

In the first stage, the waste is heated to 700-850C (1500F), but the lack of air causes the particles to become carbonated.

In the mixing chamber, air is added to re-ignite the gas at a higher temperature (above 900C or 1650F) and the material is fed into the post combustion stage for calming and burning at the required final temperature.

Energy consumption is considerably reduced.

Rotary Kiln Type with Parallel Flow.

In this system, the waste and gas move in the same direction and the plant is suitable for waste material above 10MJ/kg (4300Btu/lb).

Seiler offers a fully automated, continuously operating system with a capacity range 300-3500 kg/h (7-84 t/d).

It is ideally suited for industrial and chemical waste, hospital and toxic waste, pre-conditioned municipal waste and packing material.

Rotary Kiln with Counter Flow.

In this system, the waste material and gas move in opposite directions and the plant has a capacity range from 500-3500 kg/h (10-84 t/d).

It is suitable for waste up to approximately 10 MJ/kg.

It comprises a fully automated and continuously operating system which is suitable for municipal waste, waste water sludge, slaughter waste or any other material with a high humidity content, either in a solid or paste form.

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