| The Urea Production Unit of Henan Xinlianxin Chemical Industry Group Co.,Ltd..No.2 branch belongs to the water solution complete circulation urea process.With the progress of technology,the process presents the problems of high energy consumption,low conversion rate,high ammonia consumption,high steam consumption and high production and operation cost.In this paper,the process optimization and technical modification of the whole circulation process of aqueous solution were studied to improve the conversion rate of urea synthesis and the operation economy of the unit.Through the whole analysis of the unit,it is found that the main factors affecting the conversion rate of urea synthesis tower are:1.The process conditions of the tower;2.The structure of the tower and the inner plate of the Tower;3.The state of the art of the circulatory system.In this paper,by changing the tray structure of the synthetic tower,optimizing the process conditions of the circulation system and reasonably allocating the production resources,the incoming materials of the tower are improved,so as to increase the conversion rate of the synthetic tower in the water solution total circulation urea process,the operation cost of the device is reduced,and then the operation economy of the device is improved.Through a series of technical revamping and optimization of the unit,the conversion rate of urea synthesis was increased from 64%to over 66%by improving the purity of feed gas and optimizing the process of circulation system,the steam consumption is reduced from 1.16 t/T urea to less than 0.98 t/T urea,which improves the operation economy of the water solution full circulation urea production unit. |
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