Burning device for combustion calorimetry and combustion analysis of polymeric materials

A soot-suppression flame-separation combustion device for performing combustion calorimetry and for in-situ free radicals monitoring, the soot-suppression flame-separation combustion device comprising:

• a premixed combustion gas guide tube including an inner wall and an outlet;
• an inner flame generated seat disposed inside the premixed combustion gas guide tube;
• an oxidizing flame separation guide member disposed at the outlet;
• and
• a sample combustion chamber, wherein the inner flame generated seat comprises an annular protruding structure perpendicular to a direction of a premixed combustion airflow in the inner flame generated seat, the annular protruding structure including a first end and a first tip, wherein the first tip is disposed at least 0.1 mm away from the inner wall such that an inner flame is formed at the first end, and wherein the oxidizing flame separation guide member comprises:
• the sample combustion chamber disposed inside the oxidizing flame separation guide member and facing the inner flame generated seat such that the sample combustion chamber is directly heated by the inner flame;
• at least four oxidizing flame separation guide paths having a first top and disposed around the sample combustion chamber in an equally spaced distribution wherein each oxidizing flame separation guide path of the at least four oxidizing flame separation guide paths has a first length and a first diameter, wherein the at least four oxidizing flame separation guide paths are connected with the premixed combustion gas guide tube, wherein the first length between 5 mm and 500 mm, and the first diameter between 2 mm and 200 mm such that an oxidizing outer flame is formed at the first top, wherein the sample combustion chamber has a second diameter, a combustion products nozzle and a combustion products outlet having a third diameter connected to an outside of the sample combustion chamber in an opposite direction towards the inner flame generated seat and the combustion products nozzle is disposed at the combustion products outlet, wherein the third diameter between 1/10 and ⅘ of the second diameter so as to form a jet of combustion products.