In the embodiment shown in FIG 2, the dust free hot low temperature carbonization gases flow on into an annular mixing chamber in which they are mixed with the fresh air supplied through the spiral pipe 68 and from which they are injected into the hot reaction zone of {HEAD ~ the combustible gas readtor} 58 via {TAIL ~ the nozzle} apertures 66 
via
In the embodiment shown in FIG 2 , the dust free hot low temperature carbonization gases flow on into an annular mixing chamber in which they are mixed with the fresh air supplied through the spiral pipe 68 and from which they are injected into the hot reaction zone of { HEAD ~ the combustible gas readtor } 58 via { TAIL ~ the nozzle } apertures 66
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