Experiment Investigation on Concentration and Mass Flow Measurement of Pulverized Coal Using Electrical Capacitance Tomography

2010 ◽  
Author(s):  
J. Liu ◽  
M. Sun ◽  
X. Y. Wang ◽  
S. Liu ◽  
Liejin Guo ◽  
...  
Keyword(s):  
Mass Flow ◽  
Flow Measurement ◽  
Pulverized Coal ◽  
Electrical Capacitance Tomography ◽  
Electrical Capacitance ◽  
Capacitance Tomography

A review on image reconstruction algorithms for electrical capacitance/resistance tomography

Sensor Review ◽  
2016 ◽  
Vol 36 (4) ◽  
pp. 429-445 ◽  
Author(s):  
Ziqiang Cui ◽  
Qi Wang ◽  
Qian Xue ◽  
Wenru Fan ◽  
Lingling Zhang ◽  
...  
Keyword(s):  
Image Reconstruction ◽  
Flow Measurement ◽  
Electrical Capacitance Tomography ◽  
Electrical Capacitance ◽  
Reconstruction Algorithms ◽  
Content Type ◽  
Multi Phase Flow ◽  
Multi Phase ◽  
Image Reconstruction Algorithms ◽  
Capacitance Tomography

Purpose Electrical capacitance tomography (ECT) and electrical resistance tomography (ERT) are promising techniques for multiphase flow measurement due to their high speed, low cost, non-invasive and visualization features. There are two major difficulties in image reconstruction for ECT and ERT: the “soft-field”effect, and the ill-posedness of the inverse problem, which includes two problems: under-determined problem and the solution is not stable, i.e. is very sensitive to measurement errors and noise. This paper aims to summarize and evaluate various reconstruction algorithms which have been studied and developed in the word for many years and to provide reference for further research and application. Design/methodology/approach In the past 10 years, various image reconstruction algorithms have been developed to deal with these problems, including in the field of industrial multi-phase flow measurement and biological medical diagnosis. Findings This paper reviews existing image reconstruction algorithms and the new algorithms proposed by the authors for electrical capacitance tomography and electrical resistance tomography in multi-phase flow measurement and biological medical diagnosis. Originality/value The authors systematically summarize and evaluate various reconstruction algorithms which have been studied and developed in the word for many years and to provide valuable reference for practical applications.

Experimental Study on Transporting Concentration of Pulverized-Coal Using ECT

2013 ◽  
Vol 779-780 ◽  
pp. 1052-1055
Author(s):  
Jing Liu ◽  
Zheng Du ◽  
Shan Shan Chen ◽  
Meng Sun
Keyword(s):  
Void Fraction ◽  
Combustion Process ◽  
Experimental Studies ◽  
Pulverized Coal ◽  
Electrical Capacitance Tomography ◽  
Cyclone Separator ◽  
Pneumatic Conveying ◽  
Electrical Capacitance ◽  
Economic Operation ◽  
Capacitance Tomography

Accurate measurement of the concentration of pulverized-coal in various pipes as a guidance to proper control plays a key role in assuring safe and economic operation of a pulverized coal-fired boiler during the combustion process. Experimental studies are carried out on the measurement of a lean mass flow in a pneumatic conveying pipeline using electrical capacitance tomography (ECT). A cyclone separator is employed in this system where the sensors are placed in order to compensate the inhomogeneity of the sensor sensitivity. The distribution of void fraction in radial direction, the average void fraction and the wavy characteristics are analyzed. The feasibility and reliability of the method are verified by the experimental results.

scholarly journals Segmented Capacitance Sensor with Partially Released Inactive Segments

2015 ◽  
Vol 46 (3) ◽  
pp. 95-99 ◽  
Author(s):  
Jakub Lev ◽  
V. Prošek ◽  
P. Novák ◽  
F. Kumhála ◽  
M. Wohlmuthová
Keyword(s):  
Mathematical Model ◽  
Mass Flow ◽  
Electrical Capacitance Tomography ◽  
Material Distribution ◽  
Electrical Capacitance ◽  
Capacitance Sensor ◽  
Good Correspondence ◽  
Capacitance Tomography ◽  
The Mathematical Model

Abstract Material throughput measurement is important for many applications, for example yield maps creation or control of mass flow in stationary lines. Quite perspective can be the capacitive throughput method. Segmented capacitance sensor (SCS) is discussed in this paper. SCS is a compromise between simple capacitive throughput sensors and electrical capacitance tomography sensors. The SCS variant with partially released inactive segments is presented. The mathematical model of SCS was created and verified by measurements. A good correspondence between measured and computed values was found and it can be stated that the proposed mathematical model was verified. During measurement the voltage values on the inactive segments were monitored as well. On the basis of the measurement there was found that these values are significantly influenced by material distribution.

scholarly journals METHODS FOR MONITORING GRAVITATIONAL FLOW IN SILOS USING TOMOGRAPHY IMAGE PROCESSING

2017 ◽  
Vol 7 (1) ◽  
pp. 24-29 ◽  
Author(s):  
Krzysztof Grudzień ◽  
Dominik Sankowski
Keyword(s):  
Image Processing ◽  
Mass Flow ◽  
Flow Measurement ◽  
Shear Zones ◽  
Electrical Capacitance Tomography ◽  
Wall Region ◽  
Gravitational Flow ◽  
Tomography Image ◽  
Processing Module ◽  
Capacitance Tomography

The article presents the methods of monitoring of the process of gravitational silo discharging with aid of tomography techniques. The described methods apply to funnel and mass flow measurement. The core unit of the presented monitoring system is an image-processing module, while the images are obtained with aid of the electrical capacitance tomography. For the funnel type of flow, the outputs of image processing are parameters describing the process flow, location and material concentration in funnel area. In the case of the mass flow regime the presented method provides information about the parameters of shear zones arising by the wall region of the silo that influence the interaction between the bulk and silo construction during silo discharging.

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