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Numerical judgment method for flameless combustion state in non-premixed combustion process

A technology of flameless combustion and combustion state, which is applied to the numerical judgment of the combustion state in the non-premixed combustion process and the field of combustion state judgment in the non-premixed combustion field. It can solve the problems that CFD combustion simulation cannot be directly applied and achieve low cost Effect

Active Publication Date: 2020-09-29
SICHUAN UNIV
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Problems solved by technology

In practice, this method is not suitable for flameless combustion systems without initial preheating, nor can it be directly applied to CFD combustion simulations

Method used

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  • Numerical judgment method for flameless combustion state in non-premixed combustion process
  • Numerical judgment method for flameless combustion state in non-premixed combustion process
  • Numerical judgment method for flameless combustion state in non-premixed combustion process

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Embodiment Construction

[0036] The present invention will be described in detail below in conjunction with the accompanying drawings and embodiments.

[0037] The method process of the present invention is as figure 1 shown. In this example, the CFD numerical simulation combustion state judgment of the non-premixed propane / air combustion system is selected for analysis. According to the implementation steps of the present invention, this embodiment first performs the chemical kinetic calculation of the non-premixed propane one-dimensional flame, selects the inlet fuel concentration for parameterization setting, and calculates the flame temperature and release rate during the process of propane volume concentration changing from 1.0 to 0.01. changes in heat rate, such as figure 2shown. According to the definition of temperature rise of flameless combustion (A.Cavaliere, M. de Joannon, Mild combustion, Progress In Energy And CombustionScience. 30 (2004) 329–366.), it can be judged that when the in...

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Abstract

The invention discloses a numerical judgment method for a flameless combustion state in a non-premixed combustion process, which comprises the following steps of 1, carrying out chemical kinetic calculation on non-premixed one-dimensional flame to obtain the theoretical temperature of the flame under an ideal condition and the change of a heat release rate under different combustion states; 2, extracting the spatial distribution characteristics of the one-dimensional flame heat release rate under the ideal condition and the flameless combustion state, and describing the characteristics by using a mathematical language to enable the characteristics to become the criterion of the flameless combustion state under the complex combustion condition; 3, collecting a CFD two-dimensional or three-dimensional non-premixed combustion process simulation result of a combustion state to be judged, and extracting heat release rate spatial distribution data in the CFD two-dimensional or three-dimensional non-premixed combustion process simulation result; 4, based on the CFD simulation result heat release rate data extracted in the step 3, carrying out heat release rate characteristic calculation required by the criterion in the step 2; and 5, judging the heat release rate characteristics calculated in the step 4 by utilizing the flameless combustion state criterion in the step 2 so as to judgethe combustion state of the CFD simulation result.

Description

technical field [0001] The invention belongs to the technical field of flameless combustion, and relates to a method for numerically judging the combustion state of a non-premixed combustion process, in particular to a method for judging the combustion state of a non-premixed combustion field obtained by computational fluid dynamics (CFD) software. Background technique [0002] The flameless combustion (Flameless Combustion, MILD Combustion) phenomenon discovered in the 1990s has the important characteristics of ultra-low nitrogen oxide emissions. Over the years, the corresponding combustion technology has been continuously developed. After the establishment of flameless combustion, no bright flame front can be seen in the furnace, and the temperature and brightness distribution in the furnace are also very uniform. Therefore, in practical experiments, judging the flameless combustion state based on vision or images is a common and effective method. For example, use the fla...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G06F30/28G06F111/10G06F119/14G06F119/08
CPCG06F30/28G06F2111/10G06F2119/08G06F2119/14
Inventor 张健鹏米建春王国昌
Owner SICHUAN UNIV
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