Product gas treatment device and method for production of ammonia from urea

Through the drying and decarbonization of the urea ammonia-making gas treatment device, the problem of the need to maintain high temperature during the transportation process of urea ammonia-making gas is solved, and heat-tracking is not required, energy consumption is reduced, and the reliability and ammonia supply stability of the system are improved.

WO2025044564A1PCT designated stage expired Publication Date: 2025-03-06SUZHOU XIRE ENERGY SAVING ENVIRONMENTAL PROTECTION TECH CO LTD +1
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Patent Information

Application Number
PCT/CN2024/105694
Authority / Receiving Office
WO · WO
Patent Type
Applications
Current Assignee / Owner
Priority Date
2023-08-29
Filing Date
2024-07-16
Publication Date
2025-03-06

AI Technical Summary

Technical Problem

During the transportation process, the ammonia production gas of urea must maintain a temperature above 140°C, otherwise it will cause the ammonia gas to react inversely with carbon dioxide, forming carbamate, causing equipment blockage. At the same time, the existing technology adopts a two-way switching method to easily cause fluctuations in the product gas pressure, affecting the stability of ammonia supply, and requires additional energy consumption to desorption and recovery of the absorbent.

Method used

A gas treatment device for urea ammonia production is adopted, including a boiler, urea hydrolyzer, drying device, heating device, decarbonizing device and reaction device. Through drying and decarbonizing treatment, the stable drying of product gas and the continuous removal of CO2 are achieved, which avoids the heat tracing of product gas, reduces energy consumption, and reuses the desiccant and decarbonizing agent through the heat of the boiler flue gas.

Benefits of technology

The stable drying and CO2 removal of urea ammonia product gas is achieved, and no heat tracing is required, which reduces energy consumption, improves the reliability of the system, avoids crystallization blockage caused by low temperature of the product gas, and ensures the stability of the product gas pressure.

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Abstract

A product gas treatment device and method for production of ammonia from urea. The device comprises: a urea hydrolyzer (2), a urea solution reacting in the urea hydrolyzer (2) to generate a product gas; a drying device (3) for drying the product gas from the urea hydrolyzer (2); a heating device (8) for evaporating water absorbed by a drying agent from the drying device (3) and returning the drying agent to the drying device (3); a decarbonization device (5) for decarbonizing the product gas from the drying device (3); and a reaction device (9) for providing quicklime powder to the decarbonization device (5).
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Citation Information

Patent Citations

  • Coal-fired power plant smoke dehumidification system and technology

    CN106642178A

  • Urea hydrolytic and pyrolytic compound ammonia preparation system for denitration in thermal power plant

    CN107188198A

  • Preparation-at-use clean fuel gas robot

    CN108929734A

  • System and method for purifying product gas of urea hydrolysis

    CN113788484A

  • Urea-to-ammonia product gas treatment device and method

    CN117085472A

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