【Haichuan: Lessons from Other Places】“One Belt, Two Zones” Saves 1 Million kWh of Electricity

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“This cross-line addition is great! ”Recently, with the shutdown of the diesel transfer pump P4203, the minor modification to the “one unit with two streams” process in Unit 2 of the refining facility at Cangzhou Refining & Chemical Co., Ltd. was completed successfully. Bi Jianzeng, the deputy manager of Refining Department 2, did some calculations on the spot: \"By adding an additional pipeline and shutting down one pump, it is possible to save over 1 million kWh of electricity per year.\" ” The so-called “one pump for two circuits” actually refers to using one pump to drive two streams of the same medium to different process flows. Previously, technical personnel found that the design flow rate of pump P4201, which is used in the reboiler of the distillation tower in Hydrogenation Unit 2, was much higher than the actual operating flow rate, resulting in a situation where a machine too powerful for the task was being used. So, they wanted to make use of this excess traffic. So, they turned their attention to the diesel transfer pump P4203. Since the inlet of this pump and that of the reboiler pump P4201 both come from the bottom of the distillation tower, and the medium transported in both cases is refined diesel, people began to consider whether it would be possible to shut down the diesel transfer pump with a lower flow rate and assign its tasks to the \"larger pump\", namely reboiler pump P4201, thereby creating a \"one-pump driving two\" configuration. This approach would not affect the operation of either flow path, while also enabling energy savings. After repeated trials, they added a cross-line at the outlets of the two pumps, successfully establishing the “one belt, two pumps” process. On March 14, after completing adequate preparations, they began testing the revised process. Through a series of operations such as pipeline preheating, the reboiler pump P4201 took on the task of transporting refined diesel in two separate streams, with the flow rate kept within the designed range, thus fully meeting the production requirements. After a week of operational observation and comprehensive evaluation, it was found that following the technical upgrades, the “one belt, two” process is more convenient to operate and more stable in performance than the original process, with significant energy-saving effects as well.