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A method for characterizing thermodynamic no x Imaging monitoring method and device for generating path

A thermal and imaging technology, used in measurement devices, chemiluminescence/bioluminescence, chemical analysis using combustion, etc., can solve the problems of inability to obtain and accurately predict the generation site, and achieve real-time monitoring of NOx emissions. Easy to operate effect

Active Publication Date: 2021-09-21
SHANGHAI JIAOTONG UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

The main problem with NO-PLIF technology is the obvious absorption of the LIF signal light by oxygen and the subsequent parasitic fluorescence, especially at high temperature conditions. The cumulative effect of pressure, temperature, collisional quenching and laser attenuation must be corrected for the fluorescence signal. , so even if quantitative data can be derived from LIF, it is not possible to obtain information on the thermal NO x Information on the site of production and the pathway of its formation
Numerical simulations cannot accurately predict the NOx in the turbulent reaction field in the engine x generation site, while there is almost no information about NO x Generate experimental data for loci

Method used

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  • A method for characterizing thermodynamic no <sub>x</sub> Imaging monitoring method and device for generating path
  • A method for characterizing thermodynamic no <sub>x</sub> Imaging monitoring method and device for generating path
  • A method for characterizing thermodynamic no <sub>x</sub> Imaging monitoring method and device for generating path

Examples

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Embodiment 1

[0056] In this example, considering thermal NO x The formation of BO comes from the local incorporation of high temperature and high concentration of atomic oxygen (a component that is difficult to measure in real time), while BO as an intermediate product of the combustion of boron particles or boron salts 2 * The chemiluminescent intensity of the chemiluminescence is proportional to the local concentration of atomic oxygen, and its signal intensity is strongly dependent on the local temperature, its formation is very similar to the thermal NO x generation mechanism.

[0057] In flame, thermal NO x The formation rate of is:

[0058] d[NO] / dt∝[N 2 ][O]exp(-38370 / T)

[0059] And BO 2 * The expression of the chemiluminescent intensity of is:

[0060] P chem ∝[BO][O]exp(-25000 / T)

[0061] In the above formula, the square brackets represent the concentration.

[0062] It can be seen that the thermal NO x The formation rate and BO 2 * Both quantities of chemiluminesce...

Embodiment 2

[0070] This example uses thermodynamic and kinetic calculations to verify that BO 2 * As a tracer of combusted nitrogen oxides and dynamic in situ characterization of thermal NO x Generate feasibility.

[0071] This example is based on the B / H / O / C combustion system model. The reaction process consists of 21 components and 103 basic reactions. The boron-containing substances used in the model include B, BO, BO 2 , HBO, B 2 o 2 , B 2 o 3 and HBO 2 , while H / O / C substances include H 2 , H, O 2 , O, OH, H 2 O, H 2 o 2 、HO 2 , CO, CO 2 and HCOs.

[0072] Set the initial temperature of the simulated reaction to 1800K, the initial pressure to 1atm, and the N 2 as a buffer gas. The mole fraction of the initial species is set as follows: X(HBO)=9×10 -3 , X(B 2 o 2 )=2.8×10 -3 , X(B 2 o 3 )=5×10 -4 , X (HBO 2 )=3×10 -4 , X(O 2 )=4.4×10 -2 , X(CO)=0.18, X(H 2 )=0.20, X(H)=1×10 -4 , X(H2 O)=1×10 -5 , X(N 2 ) = 0.56.

[0073] The calculations considered the ...

Embodiment 3

[0076] This embodiment is based on the detailed embodiment of liquid fuel to characterize thermal NO x The imaging monitoring method for generating the path is described.

[0077] Commercial amorphous boron nanoparticles of 400 nm particle size were purchased in this example to be blended into the base liquid fuel (ethanol in this example). The morphology and size distribution of boron nanoparticles were determined using a field emission scanning electron microscope (SEM, NOVA NanoSEM 230). X-ray diffraction (XRD, Mini Flex 600, Rigaku) ​​was used to determine the crystalline nature of the original boron particles.

[0078] An ideal nanofluid fuel should be homogeneous, long-term stable, and low in particle aggregation. Therefore, uniform dispersion of particles in base fuels is crucial for the preparation of nanofuels. However, the actually purchased nano-boron particles have a non-spherical shape, and due to the mechanism of surface energy minimization, it is easy to caus...

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Abstract

The invention relates to a method for characterizing thermodynamic NO x An imaging monitoring method and device for generating a path, the monitoring method is: uniformly mixing boron or boron salt particles into fuel; during fuel combustion, BO 2 * As the combustion intermediate product of boron or boron salt, it is used as a tracer, and the chemiluminescence process can be monitored by imaging, and the tracer BO can be obtained 2 * Dynamic in situ information of chemiluminescence; resulting in thermal NO x The dynamic in situ information of the generation position reflects the thermal NO x The generation path. Compared with the prior art, the present invention is based on the tracer BO in the combustion process 2 * Imaging monitoring of chemiluminescence enables mapping of thermodynamic NO x The generation position of the fuel, improving the combustion performance of the fuel and reducing NO from the source x Pollutant emission; suitable for both diffusion and premixed flames, enabling real-time monitoring of NO x The purpose of emissions, and the current engine technology is mostly lean combustion, the soot radiation produced by hydrocarbon fuels has a great impact on BO 2 * will be greatly weakened, making this method more practical.

Description

technical field [0001] The invention relates to a method for monitoring nitrogen oxides, in particular to a method for characterizing thermal NO x An imaging monitoring method and device for generating a path. Background technique [0002] In daily life, nitrogen oxides are the most important combustion pollutants, and the source of nitrogen oxides mainly comes from the high-temperature combustion process of hydrocarbon fuels. 2 conversion of nitrogenous fuels, such as fossil fuels oil and coal, and the combustion of nitrogen-containing fuels. Nitrogen oxides can be formed in basically all combustion processes and high-temperature industrial processes, including combustion in power plants, propulsion units, etc. The nitrogen oxides emitted during combustion are mainly NO, accounting for about 90%-95%, followed by NO 2 and N 2 O, where the generation of thermal NO is dominant in the total NO emissions. NO is a colorless and odorless gas. Its ability to bind to hemoglobin...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01N21/84G01N21/76G01N31/12
CPCG01N21/76G01N21/84G01N31/12
Inventor 高怡
Owner SHANGHAI JIAOTONG UNIV
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