Modular burner and furnace including this burner

A burner comprising:

• a porous support;
• a combustion tube along which is mounted the porous support, the combustion tube defining at least one opening configured to pass fuel towards the porous support, wherein the combustion tube is formed of a plurality of tubular modules assembled together;
• at least one distribution tube extending inside the combustion tube and configured to distribute the fuel in a predetermined manner in the combustion tube;
• and
• a fixing means configured to fix, in a sealed manner, adjacent tubular modules of the plurality of tubular modules, wherein the fixing means comprise calibrated leakage means configured to allow fuel to pass to the porous support at a junction of the adjacent tubular modules.