The Characterization of Pulverized-Coal Pneumatic Transport Using an Array of Intrusive Electrostatic Sensors

Jurjevčič, Boštjan; Senegačnik, Andrej; Drobnič, Boštjan; Kuštrin, Igor

doi:10.1109/tim.2015.2465731

Cited by 17 publications

(22 citation statements)

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“…This means that the mean diameter of the particles m [μm] is constant during each test run. Equation (2) can be simplified and the mass flow of particles m [g s -1 ] can be expressed as [7]:…”

Section: Parameters Influencing the Electrostatic Mass-flow Measurementmentioning

confidence: 99%

“…For lignite particles a linear function was proposed for [7], and it was used with success for the representation of the particles' mass-flow distribution across the duct with a large cross-section of several square meters. If a linear function is employed for , then Eq.…”

Section: Parameters Influencing the Electrostatic Mass-flow Measurementmentioning

confidence: 99%

“…Recent research has mostly been concentrated on non-intrusive electrostatic sensors of the circular type, [1,2], arc type [3,4] and pin type [5], which were comprehensively studied numerically and experimentally. Nevertheless, the application of intrusive rod-type electrostatic sensors is attractive because of its cost effectiveness and good spatial sensitivity, especially in large, non-circular cross-sections [6,7] typical for power plants with direct-firing systems. An array of electrostatic rodtype sensors demonstrated very good performance when determining the mass-flow distribution of coal particles among burner nozzles in a full-size lignite-fired steam boiler [7] which is also very important in modelling and optimization of combustion of low rank coals [8,9].…”

Section: Introductionmentioning

confidence: 99%

“…Nevertheless, the application of intrusive rod-type electrostatic sensors is attractive because of its cost effectiveness and good spatial sensitivity, especially in large, non-circular cross-sections [6,7] typical for power plants with direct-firing systems. An array of electrostatic rodtype sensors demonstrated very good performance when determining the mass-flow distribution of coal particles among burner nozzles in a full-size lignite-fired steam boiler [7] which is also very important in modelling and optimization of combustion of low rank coals [8,9]. The electrostatic method with the appropriate statistical control scheme can be employed for the early detection and prevention of overloading the direct-firing system [10].…”

Section: Introductionmentioning

confidence: 99%

“…If the electrical properties, the size of the particles, the properties of the carrying gas and the size of sensor are constant during the measuring process, the relation can be significantly simplified. Such a simplified relation was successfully employed on a full-size, lignite-fired steam boiler for a determination of the coal's mass-flow distribution [7,17] among the burner nozzles receiving the pulverized coal from a single common mill. However, testing the electrostatic measuring method in a full-size power plant is limited to the variations of the parameters that are acceptable and safe for the operation of the plant.…”

Section: Introductionmentioning

confidence: 99%

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An electrostatic measuring technique for monitoring particle size in dilute pneumatic transport

Kuštrin

Jurjevčič²,

Senegačnik

2020

THERM SCI

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The goal of this research is to establish the applicability of an electrostatic measuring technique for monitoring the quality of a coal-milling process in direct-firing systems. Such systems are used in large steam boilers fired with low-rank coal where the pulverized coal is transported pneumatically from the mills to the burner nozzles via ducts with large cross-sections. The electrostatic measuring method, in connection with intrusive rod-type sensors, was studied because it provides good spatial sensitivity and cost effectiveness. A laboratory test rig was constructed, where the pulverized coal carried by ambient air was employed for the experiments emulating the pneumatic transport of coal particles in direct-firing systems. The test rig enables an extensive variation of the most influential parameters, like the mass flow, the velocity and the size of the particles. A linear, multiregression analysis of the results of the experiments was carried out and the appropriate regression model enabling a determination of the mean diameter of the particles using the electrostatic signal was chosen. Based on the results of the study the electrostatic measuring technique can be used for monitoring the size of pneumatically transported particles. The appropriate regression model needs to be chosen for each particular application to describe the dependency of the acquired electrostatic signal on the influential parameters of the pneumatic transport.

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Section: Parameters Influencing the Electrostatic Mass-flow Measurementmentioning

confidence: 99%

Section: Parameters Influencing the Electrostatic Mass-flow Measurementmentioning

confidence: 99%