Angus Fire


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The exhaust gases vented from the fire fighting foam production plant contain ammonia and hydrogen sulphide. For the destruction of ammonia it is necessary to employ a two stage incineration system to avoid the excessive formation of oxides of nitrogen.

The incinerator is a horizontal cylindrical unit internally lined with a castable and ceramic fibre refractory to protect the shell against thermal stresses. The length, internal diameter and orifice rings arrangement combine to give two chambers for the necessary mixing and residence time for efficient oxidation.

The natural gas burner is mounted at the end of the unit and provides the support fuel necessary for the oxidation of the waste stream. The waste stream enters via the plenum chamber and it is incinerated at a temperature of 1050°C in the primary combustion chamber.

This temperature and the control of a reduced oxygen level is required to minimise the formation of NO.

To complete oxidation of partly combusted material leaving the primary combustion chamber, dilution air is added to reduce the operating temperature to 850°C in the secondary combustion chamber.

At the end of the secondary combustion chamber further cooling air is added to reduce the temperature to 350°C prior to being vented to atmosphere through a 20m high unlined stack.

Project Details

Client: Angus Fire

Industry: Production of fire fighting foam

Application: Thermal Oxidiser system for the treatment of off gases containing ammonia and hydrogen sulphide.

Technologies

Dry Scrubbing
Thermal Oxidation