Gasification burner

A gasification burner comprising a main burner and sub-burners arranged on an inner side of the main burner, where there is a first stage of sub-burners, a next stage of sub-burners, and a last stage of sub-burners, and the main burner and each stage of the sub-burners have independent fuel channels and oxidant channels respectively;

• the main burner and each stage of the sub-burners are arranged in a coaxial sleeves from outside to inside;
• an inner diameter of the main burner is larger than an outer diameter of the first stage of the sub-burners, and an inner diameter of each stage of the sub-burners is larger than an outer diameter of the next stage of sub-burners;
• wherein the main burner includes a main outer tube and a main inner tube which are arranged coaxially from outside to inside, the main outer tube and the main inner tube are connected by a main cover plate;
• an annular space between an inner wall of the main outer tube and an outer wall of the main inner tube constitutes a main fuel channel;
• an annular space between an inner wall of the main inner tube and an outer wall of the first stage of sub-burners constitutes a main oxidant channel;
• a main fuel inlet is arranged on the main cover plate or on a side wall of the main outer tube;
• and a main oxidant inlet is arranged on a side wall of the main inner tube;
• wherein each stage of the sub-burners includes a sub-outer tube and a sub-inner tube respectively which are coaxially arranged from outside to inside, the sub-outer tube and the sub-inner tube being connected by a sub-cover plate;
• an annular space between an inner wall of the sub-outer tube and an outer wall of the sub-inner tube constitutes a sub-fuel channel;
• an annular space between an inner wall of the sub-inner tube and an outer wall of the next stage of sub-burners, or the inner space of an inner wall of the last stage of sub-inner tubes, constitutes a sub-oxidant channel;
• a sub-fuel inlet is arranged on the sub-cover plate or on a side wall of the sub-outer tube;
• a sub-oxidant inlet is arranged on a side wall of the sub-inner tube;
• and
• wherein a fuel transfer tube is arranged in the main fuel channel and the sub-fuel channel, respectively, and an outlet of the fuel transfer tube is a swirl structure.