Measurement of moisture content in a fluidized bed dryer using an electrostatic sensor array

Zhang, Wenbiao; Cheng, Xu-Feng; Hu, Yonghui; Yan, Yong

doi:10.1016/j.powtec.2017.11.006

Cited by 16 publications

(17 citation statements)

References 30 publications

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“…Experimental investigations were conducted in a lab-scale FBD, the detail of which was given in reference [26]. Electrostatic sensor arrays were installed on the wall of the FBD to collect the electrostatic signals in the bed and a temperature and humidity sensor (Model HMP110, Vaisala) was installed at the outlet of the bed to obtain the temperature and humidity of the exhaust air.…”

Section: Resultsmentioning

confidence: 99%

“…As a result, the features of the electrostatic signals in the time and frequency domains are applied to extract more information from the signals, which are applied to predict the variations of the moisture content in the FBD. However, due to the complex flow dynamics in the FBD, the electrostatic characteristics of the solid particles are influenced not only by the moisture content but also by the solids velocity [26]. As a result, the correlation velocity from the sensor arrays, which represents the solids flow behavior in the FBD, is also selected to be the input of the soft computing model.…”

Section: Resultsmentioning

confidence: 99%

“…The central angle is set to 60 degree for localized sensitivity of the electrode. With the application of the sensor arrays, the electrostatic signals as well as the correlation velocities of the solid particles in different parts of the FBD are obtained [22][23][24][25][26]. RF is a bagging-based ensemble learning method, which was introduced in 2001 by Breiman [28].…”

Section: Overall Strategymentioning

confidence: 99%

“…Recently, the effects of moisture content on the mass flow measurement of pneumatically conveyed particles using electrostatic sensors were investigated [25]. In addition, electrostatic sensor arrays have been applied to measure the moisture content of solid particles in a FBD [26]. However, it is difficult to theoretically build a model between the charging characteristics and the moisture content.…”

Section: Introductionmentioning

confidence: 99%

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Online prediction of biomass moisture content in a fluidized bed dryer using electrostatic sensor arrays and the Random Forest method

Zhang

Cheng

et al. 2019

Fuel

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Section: Resultsmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

Section: Overall Strategymentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Online prediction of biomass moisture content in a fluidized bed dryer using electrostatic sensor arrays and the Random Forest method

Zhang

Cheng

et al. 2019

Fuel

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“…For example, Wang et al [20] improved the measurement accuracy by applying the wavelet transform to the multiphase flow parameters. Considering that the signal measured by the ring electrode is an average feature over the entire cross-section, Zhang, Yang, and Dong's research found that the arc-shaped sensing electrode had an advantage in particle velocity and concentration distribution measurement in the monitoring of particle motion in gas-solid fluidized beds [21][22][23]. Qian also combined arc-shaped electrodes with digital images for the measurement of biomass-coal particles in fuel-injection pipelines [24].…”

Section: Introductionmentioning

confidence: 99%

Investigation of Induced Charge Mechanism on a Rod Electrode

Cheng

et al. 2019

Electronics

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Rod electrodes based on an electrostatic induction mechanism are widely used in various industrial applications, but the analytic solution of an induced charge mechanism on a metal rod electrode has not yet been systematically established. In this paper, the theoretical model of the induced charge on a rod electrode is obtained through the method of images. Then, the properties of the rod electrode under the action of the point charge are studied, including the induced charge density distribution on the rod electrode, the amount of the induced charge with different diameters and lengths of the electrode, and the effective space region induced by the electrode. On this basis, a theoretical model of the induced current on a rod electrode is established, which is used to study the induced current properties by a moving point charge. It is found that both the magnitude and bandwidth of the induced current increase with the increased point charge velocity. Finally, three experimental studies are conducted, and the experimental results show good consistency with the analysis of the theoretical model, verifying the correctness, and accuracy of the model. In addition, the induced charge mechanism studied in this paper can act as an effective basis for the rod electrode sensor design in terms of the optimal radius and length.

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An improved batch fluidized drying experimental design based on digital sensors and a minicomputer

Cui

Peng

et al. 2021

Engineering Reports

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In most undergraduate programs of chemical engineering in Chinese universities, the batch fluidized bed drying (BFBD) experiment is commonly adopted as a part of the experimental course of chemical engineering unit operation. In those BFBD experiments, the students should dry the material in a dryer, repeatedly sample and measure it outside to get its moisture content. In most cases, each sampling and measuring operation needs more than 5 min. The BFBD drying experiment conducted in that manner cannot obtain adequate, accurate data, making it difficult for the student to perform proper calculation and data analysis. In this article, the authors build a small BFBD prototype equipment and mount a set of digital temperature/humidity sensors. Then they use a Raspberry Pi 3, a kind of mini‐computer, to automatically measure and record the process parameters values online. Aided by those modern information process methods, the data accuracy and amount are all enhanced. Based on the gotten big data set, the student can get much more accurate results and do a more thorough analysis. The data analysis based on the old BFBD equipment is too straightforward and simple because it only needs the mass balance calculations. On the contrary, although the new BFBD equipment adopts an indirect way to measure the drying process, it obtains much more accurate results than before. The students must also apply more theories to get the results, such as mass transmission, the thermal balance, which makes the experiment more comprehensive. That is meaningful and helps to achieve the objectives of the chemical engineering experiments.

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Measurement of moisture content in a fluidized bed dryer using an electrostatic sensor array

Abstract: The version in the Kent Academic Repository may differ from the final published version. Users are advised to check http://kar.kent.ac.uk for the status of the paper. Users should always cite the published version of record.

Cited by 16 publications

References 30 publications

Online prediction of biomass moisture content in a fluidized bed dryer using electrostatic sensor arrays and the Random Forest method

Online prediction of biomass moisture content in a fluidized bed dryer using electrostatic sensor arrays and the Random Forest method

Investigation of Induced Charge Mechanism on a Rod Electrode

An improved batch fluidized drying experimental design based on digital sensors and a minicomputer

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