Melt Volume Flow Measurement in the Mineral-Wool Production Process

Abstract

The quality of the end product in mineral wool production depends on the fiberisation process on the spinning machine. An important process variable is the fluctuation of melt volume flow from the melter. In this paper, a method for measuring melt volume flow, which is based on the measuring the diameter and flow velocity using machine vision, is presented. The velocity is measured by measuring the time of the travel of flow disturbances on two consecutive images using a correlation method. The flow disturbances are generated using a pneumatic system. The results of laboratory calibration using water as well as the results of field measurements in a mineral wool plant are presented. The field measurements were performed by comparison with the weight of the final product. The results of laboratory calibration show agreement with reference volume flow measurements with R 2 = 0.96 for water. The agreement among field measured values and available comparison method is also very good.

Optical measurement of high-temperature melt flow rate

“…Output images were 706 pixels wide and 172 pixels high. A free melt stream flowing from a furnace outlet or, in our case, an open pot, is known to have an elliptical rather than circular cross-section [8]. To estimate the eccentricity of the stream cross-section, an auxiliary camera was installed horizontally, but at a 90° angle to the optical axis of the main camera so that melt flow was also visualized in a side view (instead of a second camera, a mirror can also be used).…”

“…Consequently, the disturbance displacement L can be calculated by cross-correlation, following a methodology similar to the Particle image velocimetry (PIV) method [17]. Chen et al [8] used cross correlation of spatial series of melt width (w as a function of z) for two consecutive images. Such simple correlation was possible because the diameter of the artificially generated flow disturbance was much higher than the mean melt width.…”

Control of Separation Flow over a Wind Turbine Blade with Plasma Actuators

“…Recorded images had 8-bit grey level depth, resolution of 613×200 pixels, and were captured with shutter speed of 0.5 ms. The camera was placed perpendicularly to the profile surface at the distance of 2 m from the test section of the wind tunnel [12] and [13].…”

Study of Combustion Properties for Cokes with Various Grain Size Composition

“…This in the first instance concerns blast furnace and TIM '2018 cupola cokes, coals and solid carbonaceous materials, produced by oil industry and wastes with high carbon content. [2]. Their metallurgical properties based on certificate data may vary within a broad band.…”