Urea backmixing and pyrolysis apparatus applicable to SCR denitration system and pyrolysis method

A technology of urea and pyrolysis, which is applied in separation methods, chemical instruments and methods, preparation/separation of ammonia, etc., can solve the problems of urea deposition and crystallization, increase of SCR operation cost, and influence on denitrification efficiency, etc., to achieve high-intensity mixing , improve decomposition efficiency, improve the effect of heat energy utilization

Active Publication Date: 2016-11-09
FUJIAN LONGKING +1
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  • Abstract
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Problems solved by technology

[0005] If the decomposition of urea solution is not complete during the operation of the SCR urea pyrolysis system, it will lead to urea deposition and crystallization and increase the operating cost of SCR, thus affecting the denitrification efficiency

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  • Urea backmixing and pyrolysis apparatus applicable to SCR denitration system and pyrolysis method
  • Urea backmixing and pyrolysis apparatus applicable to SCR denitration system and pyrolysis method
  • Urea backmixing and pyrolysis apparatus applicable to SCR denitration system and pyrolysis method

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Embodiment Construction

[0041] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the specific implementation manners of the present invention will be described below with reference to the accompanying drawings. Obviously, the accompanying drawings in the following description are only some embodiments of the present invention, and those skilled in the art can obtain other accompanying drawings based on these drawings and obtain other implementations.

[0042] In order to make the drawing concise, each drawing only schematically shows the parts related to the present invention, and they do not represent the actual structure of the product. In addition, to make the drawings concise and easy to understand, in some drawings, only one of the components having the same structure or function is schematically shown, or only one of them is marked. Herein, "a" not only means "only one", but also means "more than one".

[0043] In Embodim...

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Abstract

The invention discloses a urea backmixing and pyrolysis apparatus applicable to a SCR denitration system and a pyrolysis method. The apparatus comprises a tower body; the tower body is provided with, from top to bottom, a combustion-supporting wind pipeline, an inlet variable-diameter section, a pyrolytic reaction section, an outlet variable-diameter section and an outlet pipeline; the pyrolytic reaction section is provided with a spray gun layer, a compensation wind pipeline layer and a gas flow equalizing plate from top to bottom; the number of the spray gun layer is at least one; and the spray gun layer is provided with a plurality of spray guns used for spraying an atomized urea solution, the plurality of spray guns are uniformly and radially distributed on the tower wall of the pyrolytic reaction section, and the spraying direction of each of the spray guns downwardly extending along the axial direction of the pyrolytic reaction section. According to the invention, the urea solution is mixed with combustion-supporting wind for primary pyrolysis and then with compensation wind for secondary pyrolysis, so the mixing degree of the urea solution and hot gas is promoted and generation of urea deposit and crystal is prevented; thus, the decomposition efficiency of the urea solution is improved.

Description

technical field [0001] The invention relates to the technical field of structural design of a urea pyrolysis device, in particular to a urea back-mixing pyrolysis device and a pyrolysis method suitable for an SCR denitrification system. Background technique [0002] The reducing agent in the SCR denitrification process is ammonia gas, which can be directly sourced from liquid ammonia or indirectly prepared through ammonia water or urea. However, when choosing a reducing agent preparation technology, not only the initial investment and operating costs, but also safety factors, site factors, and system complexity must be considered. [0003] Since urea is a white or light yellow crystal, it has strong hygroscopicity and is easily soluble in water. The molecular formula of urea is CO(NH 2 ) 2 , under the conditions of high temperature and high pressure (160-240°C, 2.0MPa) or high temperature and normal pressure (350-650°C, 0.1MPa), the C—N bond breaks and decomposes into NH ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01C1/08B01D53/90B01D53/56
CPCB01D53/56B01D53/90B01D2251/2067C01C1/086
Inventor 张晓明任世中陈天光何永胜方巧
Owner FUJIAN LONGKING
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