Abstract: The present invention relates to a circulating coal fluidized bed coal gas producer system, including a coal gas producer, a high temperature separator, a heat exchanger, a low temperature separator, and a waste heat boiler, which are connected successively, wherein the coal gas producer is provided with a first air inlet and at least one secondary air inlet for feeding high temperature gasification agent into the producer, and is provided with a circulating coal inlet for feeding circulating coal into the producer, the first air inlet and the secondary air inlet are connected to the heat exchanger, and the circulating coal inlet is connected to the high temperature separator, the low temperature separator and the heat exchanger respectively. In the present invention, with designs of entering air twice, feeding coal at two inlets, two separations and circulations of powder coal, the temperature of gasification agent when fed into the producer could reach 750° C.-850° C.

Abstract: The present invention relates to a method for producing coal gas, including: feeding raw material pulverized coal and a high temperature gasification agent (7) into a coal gas producer (a) for reaction to produce coal gas; performing heat exchange between the coal gas coming out of the coal gas producer and a gasification agent to produce the high temperature gasification agent (7); performing heat exchange between the coal gas, after performing heat exchange with the gasification agent, and water to produce vapor (4), wherein the vapor (4) is a component of the gasification agent; and outputting the coal gas after further dust removal and desulfuration which has performed heat exchange with the water.