illustrates an embodiment of a claus reactor 1200 having four separate input ports 1202 a d located on one side of the claus reactor 1200 for introducing an oxidizer into a combustion chamber 1206 there is also one other input port 1204 located on an opposite side of the claus reactor 1200 for introducing hydrogen sulfide into the combustion chamber 1206 via six sub input ports 1206 the two reactant fluids intermix in a central area of the reactor 1200 forming two uniform thermal distribution flow patterns 1210 a b the patterns 1210 a b occupy a top and bottom central area of the combustion chamber 1206 as shown by fig2 two output ports 1212 a b are provided for the exhaust fluids to exit the combustion chamber 1206 fig2 illustrates an embodiment of a claus reactor 1300 having three separate input ports 1302 a c located on one side of the claus reactor 1300 for introducing an oxidizer into a combustion chamber 1306 there is also one other input port 1304 located on a side perpendicular to the one side of the claus reactor 1300 for introducing hydrogen sulfide into the combustion chamber 1306 via six sub input ports 1306 the two reactant fluids intermix in a central area of the reactor 1300 forming a uniform thermal distribution flow pattern 1310 the pattern 1300 occupies a central area of the combustion chamber 1306 as shown by fig2 two output ports 1312 a b are provided for the exhaust fluids to exit the combustion chamber 1306 fig2 illustrates an embodiment of a claus reactor 1400 having three separate input ports 1402 1404 a b located on one side of the claus reactor 1400 for introducing an oxidizer into a combustion chamber 1406.