Secondary combustion-supporting direct-fired non-pressure straw gasification furnace

A secondary combustion-supporting direct-fired non-pressure straw gasification furnace relates to a straw gasification furnace and aims at solving the problems that the existing straw gasification furnace has low thermal efficiency and small heating area, the direct-fired civil small-sized boiler wastes the coal resources, and both of the straw gasification furnace and the direct-burning civil small-sized boiler can not realize one boiler with multiple purposes. A furnace body with a water jacket interlayer is provided with a gas flue, a first combustion chamber, an ash storing chamber and a straw fuel bin, wherein the straw fuel bin is communicated with the first combustion chamber; a second combustion chamber is arranged on the upper end of the first combustion chamber and communicated with the first combustion chamber; the second combustion chamber is communicated with the gas flue; a second combustion-supporting device is fixedly arranged at the upper end of the interior of the first combustion chamber; t