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A method for the thermal decomposition of a fluid toxic substance contained in a gas comprises a cylindrical main combustion chamber and a secondary combustion chamber arranged thereabove. An inlet opening leads into the main combustion chamber at an angle to introduce a stream of the gas containing

A method for the thermal decomposition of a fluid toxic substance contained in a gas comprises a cylindrical main combustion chamber and a secondary combustion chamber arranged thereabove. An inlet opening leads into the main combustion chamber at an angle to introduce a stream of the gas containing the toxic substance into the main combustion chamber with an angular momentum, a burner is arranged to direct a flame into the main combustion chamber above the inlet opening for subjecting the gas containing the toxic substance to combustion, and an annular gas stream retaining device is arranged above the burner. This retaining device defines a central opening permitting the stream of gas to pass from the main combustion chamber into the secondary combustion chamber, the central opening having a diameter smaller than that of the cylindrical main combustion chamber, and passages arranged around the central opening, and the retaining device comprises obliquely downwardly directed nozzles for delivering secondary air into the main combustion chamber.

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Method for the thermal decomposition of a fluid toxic substance contained in a gas which comprises the following steps: (a) introducing a stream of the gas containing the toxic substance into a main combustion chamber, (b) directing a flame from a burner into said combustion chamber, (c) providing a

Method for the thermal decomposition of a fluid toxic substance contained in a gas which comprises the following steps: (a) introducing a stream of the gas containing the toxic substance into a main combustion chamber, (b) directing a flame from a burner into said combustion chamber, (c) providing a source of secondary air and mixing said secondary air with another toxic substance before directing it into the combustion chamber, (d) retaining the toxic substance containing gas stream in the main combustion chamber by a downwardly directed stream of said secondary air emerging from inlets arranged in a gas stream retaining device arranged above the burner until the toxic substance in the gas stream has been thermally decomposed to produce flue gases substantially free of the toxic substance, and (e) letting the flue gases pass through an opening in said retaining device into a secondary combustion chamber and further into a chimney.