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Optimization method aiming at SNCR denitration

An optimization method and denitrification technology, applied in the field of SNCR denitrification, can solve problems such as low denitrification rate

Inactive Publication Date: 2013-05-08
ZHEJIANG HAILIANG ENVIRONMENTAL MATERIALS
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Problems solved by technology

The selection of reaction window, mixing uniformity, and ammonia-nitrogen ratio are the most critical processes of SNCR technology. For large-scale power plant boilers, the denitrification efficiency is generally lower than 40%. The low denitrification rate, mixing uniformity, and high ammonia escape of large-scale furnaces are limiting SNCR Constraining factors of technological development, aiming at these constraining factors, the patent of the present invention provides an optimization method for SNCR denitrification, using the fluid dynamics correlation calculation method of flue gas denitrification to promote the improvement and development of SNCR technology

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Embodiment Construction

[0010] In order to further understand the invention content, characteristics and effects of the patent of the present invention, the following examples are listed hereby, and detailed descriptions are as follows in conjunction with the accompanying drawings:

[0011] The three-dimensional numerical simulation is carried out by using the relevant calculation method of fluid mechanics, the wall is adiabatic condition, and the coupling of the velocity field and the pressure field adopts the SIMPLEC algorithm. In the calculation of mixed smoke density, viscosity coefficient, thermal conductivity and specific heat, the mixed smoke is regarded as a mixture of various ideal incompressible gases. The grid division is between 5,000,000 and 6,000,000, and the smoke velocity field and concentration distribution are calculated by a professional computer. Such as figure 1 As shown in (a), the ammonia-nitrogen ratio is 0.91 to 0.94 in most areas in the figure, and only the small area on th...

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Abstract

The invention provides an optimization method aiming at SNCR denitration, and especially relates to a method for optimizing removing efficiency of NOx in SNCR by using a fluid-mechanics-related calculation method. The method comprises the steps that: flue gas flow field variation is simulated with a fluid mechanical method, and calculation and analysis are carried out, such that a design scheme with an optimal mixing effect is obtained; and the design scheme is used for guiding equipment mounting and PLC system control, such that SNCR operation efficiency can be improved to a maximal extent. According to the invention, flue gas velocity field, flue gas temperature field, and ammonia-nitrogen ratio at an ammonia injection grid are researched with a fluid mechanical method, ammonia injection grid mounting position and structure are finally determined, and PLC system control and ammonia injection amount are guided. Therefore, ammonia is sufficiently mixed with flue gas, and complete reaction is carried out. Removing efficiency of NOx in SNCR is improved, ammonia escaping rate is reduced, SNCR technology is improved, and SNCR application range is widened.

Description

Technical field: [0001] The patent of the present invention relates to a method for optimizing pollutant removal efficiency, especially an optimization method for SNCR denitrification. A method for optimizing NO in SNCR x Flue gas denitrification hydrodynamics correlation calculation method for removal efficiency. Background technique: [0002] Nitrogen oxides (NO x ) is the main air pollutant recognized by countries all over the world, among which NO and NO 2 It accounts for the largest proportion and is one of the main air pollutants produced during the combustion of fossil fuels. NO x In addition to harming human health as a primary pollutant, it will also produce a variety of secondary pollution. NOx is one of the important precursors to generate ozone. It forms ozone through a series of complex photochemical reactions with volatile organic gases (VOCs), and thus produces photochemical smog pollution. Among them, coal combustion is the main source of NOx emissions....

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01D53/90B01D53/56
Inventor 刘雪松石磊
Owner ZHEJIANG HAILIANG ENVIRONMENTAL MATERIALS
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