Investigation of Flame Evolution in Heavy Oil Boiler Bench Using High-Speed Planar Laser-Induced Fluorescence Imaging

In industrial steam systems, the process requires a specific pressure, and the maximum permissible operating pressure is different. If the inlet steam pressure to the steam consuming equipment exceeds the operating pressure, it may cause hazards. Therefore, the more precise control of the boiler pressure is important. Since we are dealing with a nonlinear, time-varying, and multivariable system, the control method must be designed to handle this system well. Most of the methods proposed so far are either not physically feasible or the system has considered very simple. Therefore, in this paper, while modeling the boiler and its pressure relations more precisely, we will introduce a recurrent type-2 fuzzy RBFN-based model reference adaptive control system with various uncertainties so that the uncertainty and inaccuracy of the model can be compensated. The experimental results prove the efficiency of the proposed method in boiler control.

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“…Various articles have been presented in the field of thermal management in industries [3][4][5]. Here are some of the latest ones.…”

Section: Introductionmentioning

confidence: 99%

Multivariable Model Reference Adaptive Control of an Industrial Power Boiler Using Recurrent RBFN

et al. 2021

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“…The goal of the first stage was to obtain a calibration curve (Figure 3a, on the right) -air flow temperature versus relative fluorescence of BAM:Eu particles. The procedure is similar to the one described in [17,18]. For this purpose, a series of experiments were conducted, capturing the particle images in the air flow when increasing its temperature from 20 to 500 • C. The choice of the temperature range is primarily conditioned by the thermal degradation threshold of the thermographic particles used.…”

Section: Lip Measurement Techniquementioning

confidence: 99%

“…However, the result of numerical simulation does require an experimental confirmation. With the introduction of software and hardware instruments to implement panoramic optical techniques with high-speed video recording (see, for example, in [17][18][19]), it becomes possible to conduct such experiments to study multiphase flow, aerosol, and flame. The analysis of experimental results allows us to confirm the efficiency of liquid aerosol injection in the high-temperature gas-vapor-droplet technology.…”

Section: Introductionmentioning

confidence: 99%

Temperature Fields of the Droplets and Gases Mixture

2020

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In this research, we obtain gas–vapor mixture temperature fields generated by blending droplets and high-temperature combustion products. Similar experiments are conducted for droplet injection into heated air flow. This kind of measurement is essential for high-temperature and high-speed processes in contact heat exchangers or in liquid treatment chambers, as well as in firefighting systems. Experiments are conducted using an optical system based on Laser-Induced Phosphorescence as well as two types of thermocouples with a similar measurement range but different response times (0.1–3 s) and accuracy (1–5 °C). In our experiments, we inject droplets into the heated air flow (first scheme) and into the flow of high-temperature combustion products (second scheme). We concentrate on the unsteady inhomogeneous temperature fields of the gas–vapor mixture produced by blending the above-mentioned flows and monitoring the lifetime of the relatively low gas temperature after droplets passes through the observation area. The scientific novelty of this research comes from the first ever comparison of the temperature measurements of a gas–vapor–droplet mixture obtained by contact and non-contact systems. The advantages and limitations of the contact and non-contact techniques are defined for the measurement of gas–vapor mixture temperature.

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“…A deep understanding of the combustion instabilities is beneficial to understand comprehensively the operating performance of industrial burner, especially providing a valuable reference for boiler design. Figure 1, as previously described in [26]. e laser system consisted of a pulsed Nd: YAG laser and a dye laser with a frequency-doubling BBO crystal.…”

Section: Introductionmentioning

confidence: 99%

Statistical Analysis of Flame Oscillation Characterization of Oxy-Fuel in Heavy Oil Boiler Using OH Planar Laser-Induced Fluorescence

Cao

Peng

et al. 2019

Journal of Spectroscopy

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e present work investigated the flame structures and oscillations of oxy-fuel combustions in a heavy oil boiler using OH planar laser-induced fluorescence imaging. Combustion instabilities, such as flame oscillation and combustion fluctuation, can assess the performance of an industrial burner in the boiler. e peak position variation in OH concentration was associated with the change of the reaction zone that corresponded with the fluctuation of the heat-release zone in the combustion chamber, which provides a valuable reference for the design of the combustion chamber. e experimental results suggest that the phenomenon of stratified flame combustion is related to the characteristic of flame oscillation. e substitution of N 2 with CO 2 will not significantly influence the flame oscillation frequency but increases the number of flame surface. As O 2 concentration increased in the O 2 /CO 2 atmosphere, the phenomenon of stratified flame combustion disappeared, and the flame presented an island-like structure. e bimodal oscillation of the combustion center was demonstrated by means of the probability density method; CO 2 played a role in the extension of the combustion center. e combustion fluctuation of inner regions was quantitatively described; CO 2 could maintain interregional stabilization to some extent. Compared with traditional measurement methods, PLIF technology has great advantages in evaluating burner performance and optimizing the design of the combustion chamber.

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Investigation of Flame Evolution in Heavy Oil Boiler Bench Using High-Speed Planar Laser-Induced Fluorescence Imaging

Cited by 4 publications

References 26 publications

Multivariable Model Reference Adaptive Control of an Industrial Power Boiler Using Recurrent RBFN

Multivariable Model Reference Adaptive Control of an Industrial Power Boiler Using Recurrent RBFN

Temperature Fields of the Droplets and Gases Mixture

Statistical Analysis of Flame Oscillation Characterization of Oxy-Fuel in Heavy Oil Boiler Using OH Planar Laser-Induced Fluorescence

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