原料油高压换热器换热效率下降原因分析及对策

REASON ANALYSIS OF EFFICIENCY DECLINE OF HIGH PRESSURE HEAT EXCHANGER AND COUNTMEASURES

针对中海油惠州石化有限公司2 Mt?a焦化汽柴油加氢精制装置原料油高压换热器在运行过程中换热器换热温差出现快速下降的问题,对换热器相关操作参数和换热器结垢机理进行分析,判断为换热器壳程结垢所致。通过采取往原料油中加注阻垢剂的措施,能够有效延缓换热器壳程结垢,减缓换热效率的进一步下降;且加注阻垢剂后对反应器床层压降无明显影响,也不会影响柴油产品质量。

The problem of rapid efficiency decrease of the high pressure heat exchanger for product and raw material in the coking gasoline/diesel hydrotreating unit in CNOOC Huizhou Petrochemical Co. Ltd. was analyzed based on the operation parameters and heat exchanger fouling mechanism. It is thought that the problem is caused by fouling in shell-side of the heat exchanger B and can be solved by adding scaling inhibitor into raw materials, which effectively delays the scaling and slows down further the decline of the heat transfer efficiency. Long-term operation shows that the inhibitor has no obvious effect on the pressure drop of the catalyst bed and does not affect the quality of the diesel product.