Design method of ammonia nozzle of SCR denitration device

A design method and technology for ammonia injection nozzles, which are applied in separation methods, chemical instruments and methods, and dispersed particle separation, etc., can solve problems such as analysis and research of non-ammonia injection nozzles, optimal design of non-ammonia injection grilles, etc. The effect of distributing, reducing dosage, and improving mixing uniformity

Inactive Publication Date: 2015-04-22
上海电气电站环保工程有限公司 +1
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However, this paper did not conduct specific analysis and research on the ammonia injection nozzle, nor di

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  • Design method of ammonia nozzle of SCR denitration device
  • Design method of ammonia nozzle of SCR denitration device
  • Design method of ammonia nozzle of SCR denitration device

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[0022] The present invention will be described in detail below in conjunction with specific embodiments. The following examples will help those skilled in the art to further understand the present invention, but do not limit the present invention in any form. It should be noted that those skilled in the art can make several modifications and improvements without departing from the concept of the present invention. These all belong to the protection scope of the present invention.

[0023] This embodiment provides a method for designing the ammonia injection nozzle of the SCR denitrification device under the condition of ultra-short distance. By adjusting and optimizing the structural parameters of the ammonia injection nozzle, changing the emission angle of ammonia, and then changing the distribution of ammonia reaching the catalyst, improving The mixing uniformity of flue gas and ammonia; according to the distance from the ammonia injection grid to the catalyst, the distance...

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Abstract

The invention provides a design method of an ammonia nozzle of an SCR denitration device. Aiming at the condition of ultrashort mixing distance between smoke and ammonia in the denitration device, the method comprises the following steps: optimizing the flare angle theta of the ammonia nozzle and distributing the ammonia nozzle in a staggering manner to avoid the condition that the ammonia concentration is locally too high or too low; determining the structural parameters of the ammonia nozzle according to the mixing distance, the distance between ammonia spraying grating pipes, the distance between holes and the length of the ammonia nozzle, wherein the structural parameters of the ammonia nozzle comprise the flare angle theta of the ammonia nozzle and the cross displacement delta of the ammonia nozzle. According to the method, under the condition that the mixing distance is ultrashort, the mixing uniformity of the smoke and the ammonia reaching the plane of a catalyst inlet is improved, the NOx removing efficiency is ensured, and the ammonia escape amount is reduced.

Description

technical field [0001] The invention relates to a design method of an ammonia injection nozzle of an SCR denitrification device under the condition of an ultra-short mixing distance, and belongs to the technical field of thermal power environmental protection. Background technique [0002] Selective catalytic reduction (SCR-Selective Catalytic Reduction) technology is currently the most widely used flue gas purification technology in coal-fired thermal power plants. Its main principle is to use ammonia gas (NH 3 ) and nitrogen oxides (NO x ) at V 2 o 5 / WO 3 / TiO 2 or V 2 o 5 / MoO 3 / TiO 2 The oxidation-reduction reaction carried out under the action of the catalyst composed of nitrogen gas (N 2 ) and water (H 2 O), so as to remove the harmful NO in the flue gas x . When designing the denitration device, in order to ensure the NO of the SCR system x To improve the removal efficiency and control the amount of ammonia escape, certain measures need to be taken to ...

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Application Information

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IPC IPC(8): B01D53/90B01D53/56
Inventor 冯金煌曾豪骏袁景淇丁承刚郭士义朱彬成宝琨傅继星王晓初田震
Owner 上海电气电站环保工程有限公司
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