| With view to these problems on the high consumptions of ammonia and steam in the actural operating process of urea/water solution recycling installation from Lu Nan Fertilizer Factory, this thesis mainly made a comparison on various projects for its technical innovation and also made an analysis on the optimum innovation projects, in order to provide actual guidances on saving energy and enlarging output for urea system. The thises summarized the development history of urea industry, the present technologies of urea industry, the urea/water solution recycling installation and its technical processes, the development trend and evolution of urea/water slolution recycling process, etc. The advantages and shortcomings of various technologies were also analyzed, consequently comfirming the adopted technical ruote. The innovation technical routes were calculated and compared. Therefore, a double high pressure technical process was comfirmed for saving energy. Simultaneously, the innovation on saving energy and enlarging output for ureaⅡsystem was carried out. The equilibrium calculations on feedings and heats, the analysis of system, and the anlysis of economical benefits were made. Through innovating high pressure circles and the first decomposition flow, an unique double high pressure technical process with the optimum structures of equipments was formed, resulting in the advanced installation. Besides, after resoving the subsequent system bottleneck, the comsumption of ammonia was decreased, and the operation flexibility, stability and security of the system were strengthened. The innovated installation had obviously economical and social benefits. |
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