To solve the problem of low-temperature dew point corrosion in fired heater and improve thermal efficiency, PetroChina Changqing Petrochemical Company has adopted a new ceramic regenerative air preheater in the solvent deasphalting unit deasphalting oil phase fired heater (F2202). This preheater utilizes the corrosion resistance of honeycomb ceramics to recover waste heat from flue gas through dew point, solving the corrosion problem of traditional preheaters in low-temperature flue gas recovery. Since its commissioning in May 2023, the unit has been operating safely for 17 months, and the thermal efficiency of the fired heater has consistently remained above 95%. The performance of the fired heater is tested online with switch times of 600, 720, and 900 seconds. The results indicate that all three types of switch times can achieve the goal of reducing the exhaust temperature of the fired heater to below 85 ℃ and increasing the thermal efficiency to over 95%; The shorter the switching time, the lower the exhaust temperature, the higher the thermal efficiency of the fired heater, and the better the energy-saving effect.

margin:0px 0px 16px, padding:0px, border:0px, font-size:16px, vertical-align:baseline, color:rgba(0, 0, 0, 0.9), background-color:#FFFFFF, "> fired heater, regenerative air preheater, thermal efficiency, oxygen content, furnace negative pressure, air outlet temperature, eight-way reversing valve, switch time

为解决加热炉低温露点腐蚀问题并提升热效率，中国石油天然气股份有限公司长庆石化分公司在溶剂脱沥青装置脱沥青油相加热炉中采用了新型陶瓷蓄热式空气预热器。该预热器利用蜂窝陶瓷的耐腐蚀特性，通过将烟气冷却到露点以下回收余热，解决了传统预热器在低温烟气回收中的腐蚀问题。自2023年5月预热器投用以来，装置已安全运行17个月，加热炉热效率始终保持在95%以上。在线测试了换向时间为600、720、900 s时的加热炉性能。结果表明：3种换向时间均能实现加热炉排烟温度低于85 ℃、热效率提高至95%以上的目标；换向时间越短，排烟温度越低，加热炉热效率越高，节能效果越好。

margin:0px 0px 16px, padding:0px, border:0px, font-size:16px, vertical-align:baseline, color:rgba(0, 0, 0, 0.9), background-color:#FFFFFF, "> 加热炉, 蓄热式空气预热器, 热效率, 氧含量, 炉膛负压, 空气出口温度, 八通换向阀, 换向时间