Automatic control device for thickness of gasification layer of gasifier and control method of automatic control device

The invention belongs to an automatic control device for the thickness of a gasification layer of a gasifier and a control method of the automatic control device. The automatic control device comprises a gas-making furnace, wherein a coal cabin lock hopper with a distributor is arranged at the top of the gas-making furnace; a lower coal lock hopper valve is arranged at the top of the coal cabin lock hopper; one side of the coal cabin lock hopper is connected with a coal metering groove through an upper coal lock hopper valve; the top of the coal metering groove is connected with a coal cabin through a metering belt coal supplier; a material layer is arranged in the middle of the gas-making furnace; a bottom plate is arranged at the bottom of the gas-making furnace; a toothed ring, an ash disc and a pagoda-shaped grate are sequentially arranged above the bottom plate; a gas inlet pipeline is arranged in the middle of the bottom plate; air branch tubes connected with the bottom plate arerespectively arranged on