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Urea coupling hydrolyzer and urea coupling hydrolysis method thereof

A hydrolyzer and urea technology, applied in the field of SCR denitration urea to ammonia production, can solve the problems of low conversion efficiency, corrosion of intermediate products, blockage of subsequent equipment, etc., and achieve the effect of reducing operating costs, reducing corrosion, and reducing corrosiveness.

Pending Publication Date: 2021-04-20
SHANGHAI GEHOPE ENVIRONMENTAL PROTECTION
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] There are two main types of urea replacement and upgrading technologies, one is urea pyrolysis and the other is urea hydrolysis. The urea hydrolysis process is limited due to process, pressure and temperature, and urea ammonia production is prone to intermediate product corrosion and blockage of subsequent equipment. relatively low conversion efficiency

Method used

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  • Urea coupling hydrolyzer and urea coupling hydrolysis method thereof

Examples

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Effect test

Embodiment 1

[0036] Such as figure 1 As shown, this embodiment provides a urea coupling hydrolyzer, comprising: a heat exchanger tube bundle 3 horizontally arranged at the inner bottom end of the urea coupling hydrolyzer main body 4; Outlet pipeline, the product outlet 5 set on the top of the outlet pipeline, the gas-liquid separator 6 arranged in the outlet pipeline, the gas-liquid separation pipe 7 vertically arranged on the lower side of the gas-liquid separator 6, the horizontal The coupling catalyst 8 arranged on the upper side of the gas-liquid separator 6 and the urea solution / demineralized water inlet 9 opened on the middle part of the side wall of the main body 4 of the urea coupling hydrolyzer;

[0037] Wherein, the head of the heat exchanger tube bundle 3 extends to the outside of the main body 4 of the urea coupled hydrolyzer, and the extension section is sealed with the main body 4 of the urea coupled hydrolyzer; the upper side of the head of the heat exchanger tube bundle 3 ...

Embodiment 2

[0048] This embodiment provides a urea coupled hydrolysis method using the urea coupled hydrolyzer described in Example 1, the steps comprising:

[0049] S1. Add desalted water into the main body 4 of the urea-coupled hydrolyzer through the urea solution / de-salted water inlet 9, and at least reach 25% of the volume of the main body 4 of the urea-coupled hydrolyzer;

[0050] S2. Dissolving dry urea into a urea solution with a mass concentration of 50%, and adding it into the main body 4 of the urea coupled hydrolyzer through the inlet 9 of the urea solution / demineralized water, and at least reaching the volume of the main body 4 of the urea coupled hydrolyzer 25% of;

[0051]S3. Pass steam into the heat exchanger tube bundle 3 through the steam inlet 1 for heating, and control the heating temperature to 140-190° C. and the pressure to 0.35-0.39 MPa by the inlet steam regulating valve to realize the urea break down;

[0052] S4, the product gas passes through the gas-liquid se...

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Abstract

The invention relates to a urea coupling hydrolyzer. The urea coupling hydrolyzer comprises a heat exchanger tube bundle horizontally arranged at the inner bottom end of a urea coupling hydrolyzer main body, an outlet pipeline vertically arranged at the tail part of the urea coupling hydrolyzer main body, a product outlet formed in the top end of the outlet pipeline, a gas-liquid separator arranged in the outlet pipeline, a gas-liquid separation tube vertically arranged on the lower side of the gas-liquid separator, a coupling catalyst which is horizontally arranged on the upper side of the gas-liquid separator, and a urea solution / desalted water inlet which is formed in the middle upper part of the side wall of the urea coupling hydrolyzer main body. According to the urea coupling hydrolyzer, on the premise that the pressure and the temperature are not increased, the gas-liquid separator and the coupling catalyst are additionally arranged at the position of the product gas outlet to improve the conversion rate and the conversion efficiency of preparing ammonia from urea, intermediate products are reduced, energy is saved, and meanwhile the operation cost is reduced for vast users.

Description

technical field [0001] The invention relates to the technical field of SCR denitration urea ammonia production, in particular to a urea coupled hydrolyzer and a urea coupled hydrolysis method. Background technique [0002] The reducing agents used for SCR flue gas denitrification generally include liquid ammonia, ammonia water and urea. Since liquid ammonia is a hazardous chemical, there are many strict restrictions on its transportation, storage and use. Coupled with the frequent occurrence of ammonia explosions or leakage accidents in recent years, it is necessary to control the major hazards in the liquid ammonia tank area and promote the progress of urea replacement and upgrading. [0003] There are two main types of urea replacement and upgrading technologies, one is urea pyrolysis and the other is urea hydrolysis. The urea hydrolysis process is limited due to process, pressure and temperature, and urea ammonia production is prone to intermediate product corrosion and ...

Claims

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Application Information

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IPC IPC(8): C01C1/08B01J35/04B01J35/08B01J23/22
CPCY02P20/52Y02P20/10
Inventor 章新伟李靖菀
Owner SHANGHAI GEHOPE ENVIRONMENTAL PROTECTION