The invention relates to a
hot blast heater realizing preheated
combustion of a horizontal spraying heat accumulator of premixed air flow of gas and air, effectively solving the problems that the mixing is slow and nonuniform, the
combustion strength is insufficient and incomplete, larger
combustion chamber is required, and a
combustor is complex. The
hot blast heater has the structure as follows: a hot air outlet
pipe and a mixed air flow inlet
pipe are arranged on the wall of a
combustion chamber; a distribution annular channel communicated with the mixed air flow inlet
pipe is arranged in the inner wall of the wall of the
combustion chamber; a
spray nozzle communicated with the
combustion chamber in the wall of the combustion chamber is arranged at the inner side of the distribution annular channel; a grate positioned in a
cold air chamber is arranged on the lower part of a heat accumulation chamber on the lower part of the combustion chamber; a heat accumulator is arranged in the heat accumulation chamber; a support pillar fixed at a blast bottom is arranged on the lower part of the grate; the grate, the wall of the
hot blast heater and the grate bottom form the
cold air chamber; an
exhaust gas outlet pipe and a
cold air inlet pipe are arranged on the cold
air chamber; and a labyrinth connection structure is formed between the upper part of the wall of the hot blast heater and the lower part of the wall of the combustion chamber. According to the invention, a simple sleeve
combustor is adopted, and high-strength combustion is realized by virtue of the heat accumulator, the structure of the hot blast heater is simplified and is compact so that the
investment cost is reduced, and the hot blast heater is stable in structure.