High-efficiency and energy-saving back-burning furnace (straw boiler) generally refers to a double-layer grate boiler. From a structural point of view, a back-burning furnace generally has a layer of water-cooled grate and a layer of fixed grate.

　　Because it has two layers of grate, the furnace is divided into three space parts, upper part: water-cooled grate coal-filled combustion ventilation area, middle: high-temperature burn-out area of the furnace chamber of the double-layer grate; bottom: ventilation of fixed grate falling ash Area. Before use, the upper furnace door should be fully opened for ventilation, the middle furnace door should be tightly closed, and the lower ash door should be slightly opened to ensure full combustion of the fixed grate and the combustible gas in the furnace. This is the general use requirement of the rice-burning boiler, and the body operation should be properly adjusted according to the specific conditions of the boiler combustion.