关键词: 渣油加氢装置, 加热炉, APC, 过剩氧, NOx, 热效率, 低氮燃烧器, 空气预热器

Abstract: The heating furnace of residue hydrogenation unit has the problems, such as high excess oxygen content, large fluctuation of oxygen content in radiation chamber, high concentration of NO_x in exhaust gas, high exhaust gas temperature and low thermal efficiency. To solve the above problems, a comprehensive transformation of the heating furnace system is carried out. Adding an advanced process controller, the fluctuation of negative pressure and oxygen content of the heating furnace are significantly reduced, making the operation of the heating furnace more stable. Replacing the low nitrogen burner, the mass concentration of NO_x in the discharged flue gas is reduced from 80.43 mg/m³ to 24.66 mg/m³, which is far lower than the national emission standard (100 mg/m³). Upgrading the heat pipe air preheater to a steel plate and cast iron plate combined air preheater, the flue gas temperature in summer is reduced from more than 130 ℃ to about 115 ℃, and the thermal efficiency of the heating furnace increases significantly. After a series of transformation, the operation indexes of the heating furnace of the residue hydrogenation unit have been greatly improved, and the transformation purpose of energy conservation and environmental protection has been achieved.

Key words: residue hydrogenation unit, furnace, advanced process control, excessive oxygen, nitrogen oxide, thermal efficiency, low nitrogen burner, air preheater