Porous medium premixing combustor

A porous medium premixing combustor, comprising:

• an air-fuel gas mixer having an air inlet and a coal gas inlet;
• a combustor body, wherein the combustor body comprises a casing, an outer burner block, and an inner burner block, the casing is connected to the air-fuel gas mixer through a pipe, the outer burner block and the casing are fixedly connected, and form a square chamber;
• the inner burner block is provided inside the square chamber and fixedly connected to the casing, the inner burner block has a via hole communicating with the pipe;
• the combustor body further comprises a mixed gas distributing plate, an ordered porous plate, a small-pore foamed ceramic plate, and a big-pore foamed ceramic plate sequentially provided inside the square chamber of the outer burner block along an axis direction of the via hole of the inner burner block;
• a thermocouple provided at the casing, wherein one end of the thermocouple extends into the square chamber and the thermocouple is configured for monitoring a temperature of the mixed gas before entering the ordered porous plate;
• an ignition electrode, provided close to one end of the big-pore foamed ceramic plate through an inclined hole of the outer burner block, and configured to ignite air and fuel gas at an end face of the big-pore foamed ceramic plate;
• and
• a detecting electrode, inserted in an exit end of the big-pore foamed ceramic plate through a horizontal hole of the outer burner block, and configured to detect an electric ion signal of a flame.