The invention discloses an ultra-large triplet central tube type revolving
bed gasifier, which comprises a
hearth, which is provided with a gasification section and a
dry distillation section, and the wall part of the
hearth is provided with an annular channel extending along the circumferential direction; and the triplet central tube
assembly is arranged at the relative upper position in the
dry distillation section and comprises three array tubes which are arranged in a circumferential array by taking the central axis of the
hearth as a reference and a confluence mechanism connected to the tops of the three array tubes. Multi-point uniform gas collection and primary separation are achieved through the triplet center
pipe, the triplet structure guarantees uniform radial heating of the
dry distillation section,
tar generation is reduced from the source, heavy
tar, incompletely-combusted fine carbon particles and
fly ash forcibly flow back to the gasification section
combustion chamber through the notch and the annular channel to be subjected to secondary
cracking, and the gasification efficiency is improved. The
tar content of outlet
coal gas is reduced, the
inlet flow speed is reduced through array
pipe dispersion,
fly ash entrainment in the
coal gas is effectively reduced,
bed gasification agent distribution is optimized through uniform air exhaust points, and the carbon conversion rate is effectively increased.