Coaltech Research Association

Project 2.9.6 Preventing Cutting Head Methane Emissions On Continuous Miners

Simulation work on face ventilation in mechanised coal sections, with methane sources modelled from the cut face, gathering arms, conveyors and shuttle cars. For ventilation engineers and equipment manufacturers.

By D Marais & AP Cook | April 2020

What this report found

Computational fluid dynamics, checked against underground measurements, mapped ventilation flow and methane concentration around continuous miner headings for straights and splits, single and double scrubbers, side and straight scrubber discharges, jet fans, brattices and force columns. It showed the earlier physical test work cannot predict contaminant flow for larger machines or altered scrubber layouts.

R1500,00

Description

Browse below to see more detailed images from the CFD simulations which have been recorded

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The impact of cattle grazing on rehabilitated land

Two annual surveys of species composition, biomass and soil sampling inside and outside fenced plots on rehabilitated pasture at an opencast colliery near Ogies, with benchmark sites for comparison.

What this report foundGrazing pressure on the rehabilitated block ran at roughly three times the estimated carrying capacity.

R1500,00

R1500,00

What this report found

Grazing pressure on the rehabilitated block ran at roughly three times the estimated carrying capacity. The sward was dominated by low quality grasses with a high proportion of bare ground and a raised erosion risk. Fenced exclosures over one year changed the abundance of a few species, but the vegetation showed no clear direction of recovery.

Dr Japie Viljoen

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