Novel process of medium-pressure ammine recovery system for urea water solution complete cycle production

Abstract

A novel process is used in a recovery system for manufacturing medium pressure ammonia by a urea aqueous solution complete cycle method. The medium pressure system for manufacturing urea by the aqueous solution complete cycle method adopts the following technological transformations that facilities including an evaporative condenser, an ammonia pump, an ammonia storage tank and matched pipes, valves and electrical apparatuses and instruments are added; meanwhile, the scale height of an ammonia cooler A is reduced and a urea circulating pump matched with the ammonia cooler is arranged; and the novel process abandons an ammonia cooler B\C, and changes the cooling water used in the evaporative condenser into desalted water. The invention provides the technological transformations for a medium pressure system by the urea aqueous solution complete cycle method during production and application, and has the advantages of less investment, quick returns, convenient implementation and operation, and the like.

Description

Technical field: [0001] The invention relates to the field of urea production, in particular to the technological transformation and application of a medium-pressure system for producing urea with an aqueous solution full circulation method. Background technique: [0002] At present, the process of the medium-pressure ammonia recovery system of the domestic urea aqueous solution full circulation method production device is as follows: the gas from the first suction tower enters the ammonia condenser A\B\C on the sixth floor respectively, and the circulating water from the circulating water pump enters the ammonia condenser A\ In the pipe of B\C, the ammonia in the gas is condensed and flows into the medium-pressure liquid ammonia buffer tank on the fifth floor, and the non-condensable gas enters the inert washer. [0003] The existing device has the following defects: [0004] (1) The ammonia cooler of the medium-pressure ammonia recovery system uses a shell-and-tube heat e...

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Problems solved by technology

[0004] (1) The ammonia cooler of the medium-pressure ammonia recovery system uses a shell-and-tube heat exchanger, which is cooled by circulating water. After long-term use, scale is easy to form on the side of the circulating water, which makes the heat exchange effect worse, and the ammonia condenser emits gas As the temperature rises, the volume of medium-pressure venting increases, and the load of the atmospheric pressure absorption tower increases, resulting in an increase in ammonia consumption and steam consumption

[0005] (2) In the process design of the aqueous solution full circulation method, the ammonia condenser is placed on the roof of the sixth floor (height 32m), the head required for the circulating water is high, and the power consumption is large

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