The invention relates to a horizontal mobile grate gasifier, which comprises a furnace body with a grate and an air supply device. The air supply device consists of a primary air supply
pipe and an upper-layer air supply
pipe, the primary air supply
pipe is connected with a plurality of air chambers and is arranged below the grate, the upper-layer air supply pipe is arranged on the two sidewalls of the furnace body and is communicated with the inner chamber of the furnace body, the rear part of the furnace body is provided with a
flue gas channel, the rear end of the
flue gas channel is connected with the
combustor of a boiler, a
flue gas circulating pipe which is connected with the rear part of the
combustor communicates circulating
flue gas and the upper-layer air supply pipe to form a
mixed gas channel, the
mixed gas channel and a steam pipe respectively extend into the
air chamber and the cavity of the furnace body through a primary air Venturi pipe and a secondary air Venturi pipe; and
mixed gas can flow to the front side of the
combustor of the boiler through a
gas mixing fan. The invention has the advantages of reducing Ringelman black and
smoke emission, allowing the use of
coal raw materials which are each to be coked, expanding the flexibility of the boiler use and the diversity of operating
modes, and realizing the online real-
time control and adjustment of parameters of steam output variables, grate operation and gasification dosage, thereby achieving the best operating conditions.