Furfural is an important chemical raw material. Furfural can be extracted from corn cob, and the furfural residue extracted can be used as fuel for the boiler. The boiler operates under negative pressure and uses the waste heat from the tail flue of the boiler to dry the furfural residue. Then, it enters the furnace from the top of the boiler through a separator and a feeder. The dried furfural residue falls while falling, allowing the furfural to fully mix with air and achieve complete combustion and burnout. Larger unburned furfural particles fall onto a fixed grate and continue to burn until complete combustion The steam produced by this boiler can be used for the production of furfural refining process. The three northeastern provinces are the main corn producing areas in China, rich in corn stalks. Therefore, there is a great market demand for furfural residue boilers. Our company has been developing furfural residue boilers since the late 1980s and has accumulated valuable experience in this area. Good results have been achieved in solving the combustion of fuel on the tail heating surface and improving combustion efficiency. At present, the rated evaporation capacity of furfural slag boilers produced by Shenyang Tsinghua Boiler Co., Ltd. is 4t/h, 6t/h, 10t/h, and the rated steam pressure is 1.25MPa.1.6MPa