Abstract
In coal mines that are exploiting methane-saturated seams, high-level emission of methane is often the basic limitation for modern and high-efficiency longwall complexes. This paper presents selected observations and tests carried out in the Cw-4 longwall in seam 364/2 of the Budryk mine, which belongs to JSW SA. To observe the methane levels in the Cw-4 longwall, additional sensors were installed at the end section of the longwall from the side of the gobs, and the air velocity and methane concentration were registered in a multi-point system that were built in the selected longwall cross-section. The air parameters were recorded in the monitoring system. The use of multi-point simultaneous measurements of the local velocities and concentrations of methane in the longwall cross-section allowed for the precise determination of the air and methane volume flow using the velocity field method. This allowed us to perform a comparative analysis of the obtained records of the air parameters using special software to determine the distribution of the parameters in the cross-section of the excavation. An important element of the study was the simultaneous registration of the methane concentration in the longwall, information on the operating times, the direction of shearer operation, and the type of work being done (i.e., mining/cleaning).
Highlights
Methane hazard is an important factor when mining coal seams that are saturated with methane [1]
Studies on the influence of shearer mining on ventilation conditions in a longwall complex and the development of air velocity and methane concentration transient states were conducted in Poland in the Budryk [10] and Bielszowice [11] coal mines
This confirms the significant similarity between the methane concentration values that were recorded by the methane sensors that were installed along the longwall face and the average concentration in the
Summary
Methane hazard is an important factor when mining coal seams that are saturated with methane [1]. Studies on the influence of shearer mining on ventilation conditions in a longwall complex and the development of air velocity and methane concentration transient states were conducted in Poland in the Budryk [10] and Bielszowice [11] coal mines These studies revealed considerable disturbances in the air parameters in the longwall workings during shearer operation. In situ experiments were performed with the use of a unique measuring apparatus in the form of a multi-point system with many methane-anemometers installed on selected cross-sections of the longwall In this way, the air velocity and methane concentration were simultaneously recorded and using the developed IZO-VM software, the distribution of air velocity and methane concentration in the longwall cross-section was determined. NE Famur, Katowice, Poland), an armored face conveyor (type, manufacture, city, state abbreviation, country) (AFC) (Rybnik 850, Famur, Katowice, Poland), a beam stage loader (type, manufacture, city, state abbreviation, country) (BSL) (PZP_Kobra 2, Famur, Katowice, Poland) with crusher, and belt conveyors as the haulage system
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