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As of July 5th, the optimized membrane recovery system of Daqing Petrochemical's ammonia synthesis unit has been operating stably for 20 days, increasing high-pressure hydrogen flow by 600 cubic meters per hour. This optimization involved zero investment and no new equipment, and is expected to generate nearly 2 million yuan in increased efficiency annually.
Addressing the previous shortcomings of the membrane recovery system, which primarily relied on valve opening to regulate pressure and failed to focus on inter-stage pressure changes under different operating conditions, resulting in low hydrogen recovery rates and high energy consumption, Daqing Petrochemical benchmarked against industry best practices and conducted in-depth analysis of the membrane separation mechanism. They discovered that the core variable for recovery rate lies in the flow ratio of high- and low-pressure hydrogen on the permeate side. Based on this, technicians shifted the control logic from pressure control to flow control, gradually adjusting the high-pressure hydrogen valve opening from 75% to full opening, fully releasing the efficiency of the membrane recovery system.
After optimization, in addition to the increased hydrogen recovery, approximately 0.8 tons of steam per hour are saved, and daily ammonia production increases by approximately 2.5 tons, achieving the dual goals of energy saving and increased production.
