C4 Evaporator Heat Transfer Efficiency Decline Reason Analysis and Improvement Measures
The methanol-to-propylene project of Ningxia Coal Industry of National Energy Group was put into operation in 2014,and the unit produces propylene from methanol and recycled hydrocarbons.Among them,C4 recycled hydrocarbons account for about 10％of the total feed-stock,so the amount of C4 recycled hydrocarbons will have a direct impact on the yield of the main product of the plant.In this paper,for the problem of heat transfer efficiency decline of C4 cycle hydrocarbon evaporator in the operation process,its operation status,process flow and e-quipment structure and other related factors were analyzed in depth.After the study,the specific reasons leading to the decline in heat transfer efficiency were clarified.By strengthening operation management,controlling the water content of C4 circulating hydrocarbons,reducing the co-king rate of heat exchanger tube bundles,and cleaning the heat exchanger tubes on a regular basis,we have solved the problem of declining heat exchanger efficiency of the C4 evaporator,and ensured the operating efficiency and comprehensive economic benefits of the device.
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