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Method and system for recovering waste ammonia water in urea production

A recovery method and technology of a recovery system, which are applied in the preparation/separation of ammonia, chemical instruments and methods, ammonia compounds, etc., can solve the problems of increased production costs and increased steam consumption, and achieve increased production costs and income. , the effect of avoiding consumption

Inactive Publication Date: 2020-11-13
CHONGQING JIANFENG CHEM
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] However, when the mixed solution of methylamine, ammonium carbonate and ammonia water is transported back to the high-pressure system for recovery treatment and used as a raw material in the synthesis tower, the high-pressure system recovery treatment makes the ammonia water decompose into ammonia gas and requires the use of a large amount of steam, thereby reducing the consumption of steam The volume has risen sharply, resulting in an increase in production costs

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  • Method and system for recovering waste ammonia water in urea production

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Embodiment 1

[0032] This embodiment provides a method for recovering waste ammonia in urea production, including the following steps:

[0033] A1: The waste ammonia produced in the medium-pressure ammonia absorption tower 1 is transported to the separation tower 2 and treated at an operating pressure of 1.5MPa and a temperature of 45°C to separate ammonia;

[0034] A2: The ammonia separated in the separation tower 2 is transported to the cooler 3 for processing, and the cooling is liquefied into liquid ammonia;

[0035] A3: The liquid ammonia produced in the cooler 3 is transported to the washing tower 4, mixed with the desalinated water in 6:1 parts by weight, and treated with an operating pressure of 0.3MPa, a temperature of 5°C, and a washing water volume of 180Kg to produce ammonia;

[0036] A4: Detect the concentration of ammonia water produced after treatment, and when the waste ammonia water does not reach the required concentration, it will be sent to the washing tower 4 for repeated treatm...

Embodiment 2

[0040] This embodiment provides a method for recovering waste ammonia in urea production, including the following steps:

[0041] A1: The waste ammonia produced in the medium-pressure ammonia absorption tower 1 is transported to the separation tower 2 and treated at an operating pressure of 3MPa and a temperature of 15°C to separate ammonia;

[0042] A2: The ammonia separated in the separation tower 2 is transported to the cooler 3 for processing, and the cooling is liquefied into liquid ammonia;

[0043] A3: The liquid ammonia produced in the cooler 3 is transported to the washing tower 4, mixed with the desalinated water at 10:1 parts by weight, and treated with an operating pressure of 1MPa, a temperature of -5°C, and a washing water volume of 220Kg to produce ammonia;

[0044] A4: Detect the concentration of ammonia water produced after treatment, and when the waste ammonia water does not reach the required concentration, it will be sent to the washing tower 4 for repeated treatmen...

Embodiment 3

[0048] This embodiment provides a method for recovering waste ammonia in urea production, including the following steps:

[0049] A1: The waste ammonia produced in the medium pressure ammonia absorption tower 1 is transported to the separation tower 2 and treated at an operating pressure of 2.5MPa and a temperature of 30°C to separate ammonia;

[0050] A2: The ammonia separated in the separation tower 2 is transported to the cooler 3 for processing, and the cooling is liquefied into liquid ammonia;

[0051] A3: The liquid ammonia generated in the cooler 3 is transported to the washing tower 4, mixed with the desalinated water in 8:1 parts by weight, and processed with an operating pressure of 0.6MPa, a temperature of 0°C, and a washing water volume of 200Kg to produce ammonia;

[0052] A4: Detect the concentration of ammonia water produced after treatment, and when the waste ammonia water does not reach the required concentration, it will be sent to the washing tower 4 for repeated tre...

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Abstract

The invention relates to the technical field of urea production, and discloses a method for recovering waste ammonia water in urea production. The method comprises the following steps: A1, conveying the waste ammonia water generated in a medium-pressure ammonia absorption tower into a separation tower for treatment, and separating out ammonia gas; A2, conveying the ammonia gas separated from the separation tower into a cooler for treatment, and converting cooling liquid into liquid ammonia; A3, conveying the liquid ammonia generated in the cooler into a washing tower for treatment to generateammonia water; A4, detecting the concentration of ammonia water generated after treatment, and conveying the waste ammonia water into a washing tower for repeated treatment when the concentration of the waste ammonia water does not reach the required concentration; and A5, when the concentration of the waste ammonia water reaches the required concentration, conveying the waste ammonia water into an ammonia water storage tank to obtain an ammonia water product. According to the invention, the waste ammonia water generated in the medium-pressure ammonia absorption tower can be directly producedand prepared into the marketable ammonia water product, so that great increase of steam consumption caused by conveying a large amount of waste ammonia water back to a high-pressure system for recovery treatment is avoided, the production cost is increased, and the income of the marketed ammonia water product is newly increased.

Description

Technical field [0001] The present invention relates to the technical field of urea production, in particular to a method and system for recovering waste ammonia in urea production. Background technique [0002] In the urea production plant, NH from the urea synthesis tower 3 , CO 2 , NH 4 COONH 2 , CO(NH 2 ) 2 , H 2 O five-element gas-liquid mixture, the material after the separation and recovery of most of the unreacted substances in the unreacted substance decomposition and recovery system is called urea liquid, and its components are: urea: 68%, H 2 O: 29%, NH 3 : 1.5%, CO 2 : 0.5% enters the urine tank. The urea solution in the urea tank is pressurized by the urea solution pump and sent to the evaporation system to complete the separation of the water in the urea solution, and the urea solution is concentrated to 99.7% and sent to the granulator for granulation. [0003] The unreacted substances in the synthesis tower are transported to the medium pressure ammonia absorption t...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01C1/02C01C1/10
CPCC01C1/02C01C1/022C01C1/10
Inventor 叶世贤王庆军杜缝涛付磊
Owner CHONGQING JIANFENG CHEM
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