渣油加氢装置节能优化设计

Optimization design for residue hydrodesulfurization unit

介绍了某公司新建2.5 Mt/a渣油加氢处理装置工艺概况及原设计节能措施,从操作参数、工艺流程设置及能量综合利用等方面,介绍了汽、电、燃料和水等方面的节能优化方案,并提出以下改进措施:①降低空冷入口温度,回收低温热;②降低烟气温度,提高加热炉效率;③循环氢压缩机采用背压式汽轮机;④新氢压缩机采用常规逐级返回流程,可选用HydroCom系统,提浓氢单独设置压缩机;⑤过滤器反冲洗油直接送催化裂化装置;⑥空冷器与加热炉风机采用变频技术;⑦优化流程,降低循环水用量;⑧优化换热流程,提高发生蒸汽品质与流量;⑨设置液力透平,回收能量;⑩调整机泵选型,选择高效机泵。节能优化设计使装置能耗比原设计低296.78 MJ/t,年经济效益约为1 000×104 RMB$。

The process and the original energysaving design of a 2.5 MM TPY residue hydrodesulfuration unit are introduced. Based on the operating parameters, the design of process flow and comprehensive energy saving optimization plans for steam saving, power saving, fuel gas saving and water saving are described re spectively, and corresponding improvement measures are presented： （1）air cooler inlet temperature is reduced and lowertemperature heat is recovered; （2）flue gas temperature is lowered and the efficiency of furnace is im proved; （3）the recycle gas compressor with backpressure turbine is adopted; （4） makeup gas compressor can use conventional sequential return flow and select HydroCom system, and bleed gas compressor is provided separately ; （5） the sump oil of feed filter is directly sent to RFCC ; （6） the variable frequency technology is ap plied for the air cooler and the heater air blower; （7）process is optimized to reduce cooling water requirement; （8）the heat exchange process is optimized to improve the quality of steam and increase steam flowrate; （9） hy draulic turbine is installed to recovery energy; （10） these energysaving optimization plans and design, feed lower than that of original design. The annual highefficiency pump is selected. After implementation of the comprehensive energy consumption of unit is 7.10 kg/t benefit is approximately 10 million Yuan （RMB）.