Supercritical hydrothermal combustion device

A supercritical hydrothermal combustion device, comprising a main enclosure (10), a top cap (1) being mounted at a top of the main enclosure (10), wherein:

• a partition (14) is mounted in the main enclosure (10) and divides an interior of the main enclosure (10) into an upper main combustion space A2 and a lower mixing space A3, a hole is formed in the partition (14), a mixing water inlet (15) is formed in an upper portion of the mixing space A3, and a combustion product nozzle (17) is disposed at a bottom of the mixing space A3;
• the top cap (1) is provided with a primary fuel inlet (18), an oxidant inlet (19) and a secondary fuel inlet (4), a high-temperature ignition bar sleeve (2) is disposed in the top cap (1), a high-temperature ignition bar (3) is disposed in the high-temperature ignition bar sleeve (2), and the primary fuel inlet (18) is communicated with an interior of the high-temperature ignition bar sleeve (2);
• a combustion sleeve (9) is mounted at a bottom of the top cap (1), a high-temperature end of the high-temperature ignition bar (3) extends into the combustion sleeve (9), the combustion sleeve (9) has a top communicated with the high-temperature ignition bar sleeve (2) and the oxidant inlet (19), as well as a bottom communicated with the main combustion space A2, and a stable combustion space A1 is formed in the combustion sleeve (9), thereby a primary fuel and oxidant provided into the stable combustion space A1 is in direct contact with the high-temperature ignition bar (3) in the stable combustion space A1;
• the secondary fuel inlet (4) is directly communicated with the main combustion space A2.