A system and method for rapid preparation of ammonia

Abstract

The invention discloses a system for rapid preparation of ammonia water, which comprises an ammonia water preparation tank, an ammonia absorption tower, a cooling heat exchanger and an ammonia water storage tank, wherein a new water outlet formed in the bottom of the ammonia absorption tower is communicated with a new water pipe; an ammonia water outlet A formed in the bottom of the ammonia water preparation tank is communicated with an ammonia water inlet A formed in the bottom of the cooling heat exchanger; a circulating pump is arranged on a pipeline between the ammonia water outlet A and the ammonia water inlet A; an ammonia water outlet B formed in the top of the cooling heat exchanger is communicated with a circulating ammonia water pipe; the ammonia water outlet B formed in the top of the cooling heat exchanger is also communicated with an ammonia water inlet B of the ammonia water storage tank; an ammonia gas outlet formed in the top of the ammonia gas preparation tank is communicated with a gas inlet formed in the middle part of the ammonia absorption tower; the gas inlet is also communicated with a gas outlet of the ammonia water storage tank; and the distance from the bottom of the ammonia absorption tower to the top of the ammonia water preparation tank is larger than or equal to 1m. The system can be used for rapid preparation of the ammonia water in a manner of integrating the advantages of an ammonia water preparation process utilizing gaseous ammonia and the ammonia water preparation process utilizing liquid ammonia.

Description

technical field [0001] The invention belongs to the technical field of chemical production, and in particular relates to a rapid preparation system and method for ammonia water. Background technique [0002] In the ammonia water preparation technology, it is divided into two categories: slow ammonia water preparation and fast ammonia water preparation. [0003] Slow-speed ammonia water preparation is mainly the current method of ammonia water preparation, which is to quickly unload the ammonia in the liquid ammonia tank car into the liquid ammonia storage tank with a compressor, add softened water to the ammonia water preparation tank, and then put the liquid ammonia into the liquid ammonia storage tank. The ammonia in the storage tank is slowly added to the ammonia water preparation tank to make ammonia water. Since the process of preparing ammonia water with liquid ammonia will release a lot of heat, the process of preparing ammonia water without a heat exchanger needs to...

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Problems solved by technology

Both have their own advantages and disadvantages: the process of preparing ammonia water from liquid ammonia generally needs to maintain a certain pressure to prevent the gasification of liquid ammonia, and the preparation equipment belongs to a pressure vessel; while the gas ammonia preparation process does not have this requirement, and the pressure of the gas ammonia preparation process is relatively low. The safety is high, but the process and equipment are more complicated, and the preparation speed is relatively slow

[0005] The traditional fast ammonia water preparation system process uses a one-time preparation of ammonia and water in a pressure vessel similar to a heat exchanger. Although there are also two preparation methods of liquid ammonia and ammonia gas, a special pressure heat exchanger is required. As a reactor, due to the gasification and the narrow reaction space, the detonation phenomenon is serious in the reactor

The non-recyclability of the configuration process has also become a major defect in the configuration process. The gas ammonia that is not absorbed in the configuration process will continue to increase the concentration and partial pressure of gas ammonia in the ammonia water storage tank after entering the storage tank with ammonia water, resulting in escape. Ammonia leaks out after passing through the water seal from the ammonia water storage tank, and is discharged into the atmosphere, and the water seal has no effect

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