Temperature measurement of stored biomass using low-frequency acoustic waves and correlation signal processing techniques

Guo, Miao; Yan, Yong; Hu, Yonghui; Zhang, Jingqiong

doi:10.1016/j.fuel.2018.04.062

Cited by 20 publications

(6 citation statements)

References 24 publications

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“…In order to explore the propagation characteristics of sound waves in pulverized coal, Yang et al 119 actually built a pulverized coal acoustic propagation experimental system, carried out research on acoustic attenuation characteristics with different acoustic frequencies, and determined the acoustic frequency band and delay estimation algorithm suitable for detection in pulverized coal. Guo et al 120 built an experimental system for measuring biomass temperature with acoustic method. By introducing characteristic factors, they studied the propagation velocity of sound waves in biomass at different temperatures, and the results showed that there was a good inversion accuracy between sound velocity and coal temperature in the range from 22 °C to 48.9 °C.…”

Section: Research Progress Of Coal Fire Disaster Control Technologymentioning

confidence: 99%

Research Status and Development Trend of Coal Spontaneous Combustion Fire and Prevention Technology in China: A Review

Liu,

Wen,

Chen

et al. 2024

ACS Omega

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Coal seam spontaneous combustion fire is not only one of the main forms of the five major mine disasters, but also the main cause of secondary disasters such as mine gas and coal dust explosions. In recent years, with the advancement of mechanization, automation, and intelligent mine construction, spontaneous coal fires in mines have presented a series of new characteristics, and the prevention and control of spontaneous coal fires are also facing new challenges. On the basis of literature research, this paper summarizes and discusses the basic theory of coal spontaneous combustion, monitoring and early warning methods, and prevention and control technology, summarizes the development process of coal spontaneous combustion theory, reviews the research progress of coal spontaneous combustion monitoring and early warning methods and prevention and control technologies, and discusses the future development direction. In terms of the basic theory of spontaneous combustion of coal, from the initial hypothesis of spontaneous combustion of multielement coal to the unified understanding of coal-oxygen composite theory, a complete set of theoretical systems have been established, and a lot of macro and micro studies have been carried out and analyzed from multiple perspectives. In terms of coal spontaneous combustion monitoring and early warning, from the initial single indicator gas early warning to the construction of gas index system, the hierarchical early warning system is studied, and gradually tends to be perfect. With the development of automation and intelligence technology, the monitoring of coal spontaneous combustion disasters has also formed a new monitoring technology with beam tube monitoring as the traditional method, distributed optical fiber, wireless AD hoc network temperature measurement, and a coal spontaneous combustion multiparameter wireless monitoring system. In terms of fire prevention and control, the traditional “prevention” and “treatment” have changed to the “prevention–control–extinction” technical system based on hierarchical early warning, and the focus has gradually shifted to “prevention”, and a large number of antifire materials have been developed, including blocking materials and fire-fighting materials. However, the precise inhibition and control of coal spontaneous combustion disasters, the evolution model of coal spontaneous combustion under the conditions of multifactor coupling in the field, the reliability and stability of intelligent monitoring system, the noncontact detection method of fire source, and the collaborative adaptation of multiple prevention and control techniques are not yet clear. In the future development, the mechanism of spontaneous coal combustion and its evolution process and other basic theories should be deeply studied. On the basis of the mechanism optimization early warning method of spontaneous coal combustion process, flame retardant and fire prevention materials should be targeted and developed. On the basis of the spatiotemporal evolution of spontane...

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Section: Research Progress Of Coal Fire Disaster Control Technologymentioning

confidence: 99%

Research Status and Development Trend of Coal Spontaneous Combustion Fire and Prevention Technology in China: A Review

Liu,

Wen,

Chen

et al. 2024

ACS Omega

View full text Add to dashboard Cite

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“…In order to improve the accuracy of RBF approximation, the RBF approximant is usually extended by polynomial function P k of degree k. Now, equation (5) can be expressed as…”

Section: Mathematical Problems In Engineeringmentioning

confidence: 99%

“…Acoustic tomography (AT) has been widely used and provided an effective means for temperature distribution visualization owing to the advantages of wide measuring range, noncontacting measurement, and large measurement space. In recent years, the AT method has been widely used in various applications, such as boiler furnaces [1,2], deepsea hydrothermal vents [3,4], stored grain [5,6], and atmospheric surface layer [7,8]. In this paper, we applied the AT method to reconstruct the temperature distribution in a boiler furnace.…”

Section: Introductionmentioning

confidence: 99%

“…In boiler furnaces, the process of combustion is variable and complex, which has the characteristics of high temperature, dust, turbulence, and so on [4][5][6]. Acoustic tomography, as an important and efficient method, has been applied to measure the temperature fields in furnaces to improve the combustion efficiency of the boiler and ensure the safe operation of the boiler.…”

Section: Introductionmentioning

confidence: 99%

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3D Temperature Distribution Reconstruction in Furnace Based on Acoustic Tomography

Kong

Jiang

Liu

et al. 2019

Mathematical Problems in Engineering

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3D temperature distribution measurement in a furnace based on acoustic tomography (AT) calculates temperature field through multipath acoustic time-of-flight (TOF) data. In this paper, a new 3D temperature field reconstruction model based on radial basis function approximation with polynomial reproduction (RBF-PR) is proposed for solving the AT inverse problem. In addition, the modified reconstruction method that integrates the advantages of the TSVD and Tikhonov regularization methods is presented to reduce the sensitivity of noise on perturbations with the ill-posed problems and improve the reconstruction quality (RQ). Numerical simulations are implemented to evaluate the effectiveness of the proposed reconstruction method using different 3D temperature distribution models, which include the one-peak symmetry distribution, one-peak asymmetry distribution, and twopeak symmetry distribution. To study the antinoise ability of our method, noises are added to the value of TOF. 3D display of reconstructed temperature fields and reconstruction errors is given. e results indicate that our model can reconstruct the temperature distribution with higher accuracy and better antinoise ability compared with the truncated generalized singular value decomposition (TGSVD). Besides that, the proposed method can determine the hot spot position with higher precision, and the temperature error of the hot spot is lower than the other compared methods.

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“…To improve the data acquisition accuracy, the sensor output signal should be amplified and meet the input range requirements of the A/D conversion chip. In addition, the amplified signals need to be filtered in order to remove noise interference [7].…”

Section: Signal Conditioning Circuitmentioning

confidence: 99%

Design and implementation of furnace temperature measurement system for power plant coal-fired boiler in acoustic method

Tian

Zhang

Tian³

2018

MATEC Web Conf.

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The furnace temperature of coal-fired boilers in power plants is an important operating parameter for boiler flame monitoring and control, which directly affects the combustion efficiency and the safety of boilers. Based on the research status at home and abroad and the previous research foundation, this paper studies and designs the temperature measurement system of acoustics method. The principle of temperature measurement by sound method is discussed in this paper, and the generalized cross correlation (GCC) method for measuring flight time of sound waves is introduced. The software and hardware of the temperature measurement system are designed in detail. The experiment is carried out according to the measured data of power plant and the results show that the system can measure the average temperature of acoustic paths in the furnace. The feasibility of the system is verified. And this study provides a basis for the reconstruction of furnace temperature field.

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Temperature measurement of stored biomass using low-frequency acoustic waves and correlation signal processing techniques

Cited by 20 publications

References 24 publications

Research Status and Development Trend of Coal Spontaneous Combustion Fire and Prevention Technology in China: A Review

Research Status and Development Trend of Coal Spontaneous Combustion Fire and Prevention Technology in China: A Review

3D Temperature Distribution Reconstruction in Furnace Based on Acoustic Tomography

Design and implementation of furnace temperature measurement system for power plant coal-fired boiler in acoustic method

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