加热炉热效率提升改造及效果分析

Transformation of Heating Furnace for Thermal Efficiency Improvement and the Effect Analysis

加热炉余热回收系统效率的高低是影响加热炉热效率的主要因素。惠州石化润滑油加氢装置加热炉按照国家标准中12MW以下加热炉效率大于90%的要求进行的设计,为满足节能环保需要,新指标要求加热炉热效率大于92.2%,为此对该装置加热炉空气预热器进行改造。经过对现有热管式空气预热器和铸铁板式空气预热器的设备重量、耐腐蚀性、传热系数和使用寿命进行对比,决定采用性能更优的铸铁板式空气预热器替换现有的热管式空气预热器。改造后,加热炉排烟温度下降明显,热效率达到了93.11%,实现了改造目的,经计算每年可节省85.89万元,2.5年即可节省出投资费用。加热炉F202由自然通风改为强制通风,鼓引风机改为变频调节,各加热炉炉膛负压、氧含量波动小,加热炉燃烧情况稳定,满足项目改造要求,效果显著。

The efficiency of waste heat recovery system of heating furnace is the main factor affecting the thermal efficiency of heating furnace.The heating furnace of the lube oil hydrogenation unit of Huizhou Petro-chemical was designed in accordance with the requirements of national standards that the efficiency of heat-ing furnace below 12MW shall be greater than 90%.In order to meet the needs of energy conservation and environmental protection,the new index requires the thermal efficiency of heating furnace to be greater than 92.2%,so the air preheater of the heating furnace was transformed.After comparing the equipment weight,cor-rosion resistance,heat transfer coefficient and service life of the existing heat pipe air preheater and the cast iron plate air preheater,it was decided to replace the existing heat pipe air preheater with the cast iron plate air preheater with better performance.After the transformation,the exhaust temperature of the heating fur-nace decreased significantly,and the thermal efficiency reached 93.11%,achieving the purpose of transforma-tion.It was calculated that 858900yuan can be saved per year,and the investment cost can be saved in 2.5 years.The heating furnace F202 was changed from natural ventilation to forced ventilation,and the induced draft fan was changed to frequency conversion regulation.The fluctuations in the negative pressure and oxygen content of each heating furnace was low,and the combustion of heating furnace was stable,which meets the project transformation requirements and has remarkable effect.