System and method for rapid preparation of ammonia water

A preparation system and ammonia water technology, applied in the field of chemical production, can solve the problems of non-circulation in the configuration process, ineffective water seal, complex process and equipment, etc., to achieve convenient disassembly and cleaning, prevent escape, and simple installation Effect

Active Publication Date: 2014-06-04
CINF ENG CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

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

Method used

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  • System and method for rapid preparation of ammonia water
  • System and method for rapid preparation of ammonia water

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0039] see figure 1 and figure 2 , the ammonia water rapid preparation system ammonia water preparation tank 1, ammonia absorption tower 2, cooling heat exchanger 3, ammonia water storage tank 4;

[0040] The ammonia water preparation tank 1 is provided with a diluter 21 extending into the ammonia water preparation tank 1 inside, and the diluter 21 includes a liquid ammonia delivery pipe 16, a new water pipe 6, and a circulating ammonia water pipe 10, and they are arranged on a coaxial center line. The new water pipe 6 and the circulating ammonia water pipe 10 are sequentially socketed outside the liquid ammonia delivery pipe 16, and they are arranged on the coaxial center line; the lower port of the liquid ammonia delivery pipe 16 is closed, and there is a discharge hole 22 at the lower end of the pipe wall; the new water pipe 6 and the lower end of the circulating ammonia water pipe 10 are internally connected with the ammonia water preparation tank 1, and the lower end ou...

Embodiment 2

[0047] A method for preparing ammonia based on the preparation system described in Example 1, comprising the steps of:

[0048] (1) Connect the circulating cooling water system to the cooling heat exchanger and turn on the circulating water cooling system;

[0049] (2) Open the new water intake regulating valve and keep the predetermined water supply at 25-30t / h;

[0050] (3) When the liquid level in the ammonia water preparation tank reaches 550-650mm, start the circulation pump;

[0051] (4) Open the liquid ammonia regulating valve, first slowly increase the opening of the liquid ammonia inlet regulating valve within 10% of its total opening, and control the mass percentage concentration of ammonia water in the ammonia water preparation tank to 1-10%; when the liquid ammonia After the ammonia flow rate is stabilized at 3-5t / h, continue to slowly increase the opening of the liquid ammonia feed regulating valve, and control the mass percentage concentration of ammonia water i...

Embodiment 3

[0056] The engineering example that preparation system described in embodiment 1 prepares ammoniacal liquor is as follows:

[0057] Step is as described in embodiment 2, and concrete parameter is:

[0058] New water supply (controlled by fresh water regulating valve, flow meter display value) is 30t / h, liquid ammonia supply (controlled by liquid ammonia regulating valve, inverse calculation value) is 3.28t / h, ammonia water output is 33.28t / h, and the final configuration Ammonia concentration 11% (measured value, mass percentage). The inlet temperature of the ammonia water in the cooling heat exchanger is 33°C, and the outlet temperature of the ammonia water is 27°C (the temperature difference is 6°C). Ammonia water distribution system Ammonia circulation volume ~65m 3 / h, the circulating water volume of the circulating water cooling system is 100m 3 / h. The pressure of the liquid ammonia tanker is 0.5~0.6MPa (gauge pressure), and the pressure of the configured tank reactor...

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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...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01C1/02
Inventor 朱智颖吴桂荣袁爱武李伟达蔡旺姚腾猛
Owner CINF ENG CO LTD
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