北京燕山石油化工公司炼油厂丙烷脱沥青装置设计加工能力为35×10~4t/a,沥青溶液加热炉设计热负荷为8721kW,而实际装置加工量只有26×10~4～28×10~4t/a,其炉热负荷为5581kW左右,排烟温度在380℃左右,加热炉实际热效率一般在70%左右.为了提高加热炉热效率,于1983年对加热炉进行了节能改造,增设了固定光管式空气预热器,以回收烟气余热.改造后排烟温度一般在 Beijing Yanshan Petrochemical Company refinery propane deasphalting unit design and processing capacity of 35 × 10 ~ 4t / a, asphalt solution furnace design heat load of 8721kW, while the actual device processing capacity of only 26 × 10 ~ 4 ~ 28 × 10 ~ 4t / a, the furnace heat load is about 5581kW, the exhaust temperature is about 380 ℃, the actual thermal efficiency of the furnace is generally about 70% .In order to improve the thermal efficiency of the furnace, in 1983, the furnace was energy-saving transformation, the addition of fixed light Tube air preheater to recover flue gas waste heat. After the renovation of the exhaust temperature is generally