Sentence examples for coal layer from inspiring English sources

Each coal layer represents the ancient forest, fossilized and compressed into coal.

The shale bed immediately below each coal layer represent the former soil from which the plants in the coal layer grew; fossils of roots are commonly found in this layer.

Field stations are required to separate the water and methane that flow from the coal layer, as well as remove carbon dioxide from the methane.

The favourable area for No. 2+8+9 coal layer is located in the eastern Yang Zhuang well field.

The dark band in this photo (indicated by the arrow) of the Hell Creek Formation in Montana is known as the z-coal, a coal layer that marks the approximate boundary between Cretaceous (below) and Tertiary (above) age rocks.

It verified that many gaseous pyrolysis products escaped from the central low-temperature coal layer, indicating the suppressed secondary reactions to the primary products.

Thus coal can be excavated efficiently through mountaintop mining because of the integrated coal layers within mountains.

During the process of gasifying thin coal layers underground, an open channel structure might exist.

"Production is growing very rapidly". Energy companies have known since the 1920's that coal layers contain methane, often in large concentrations.

Many parts of the state, like the foundation of Centralia, are also riddled with old abandoned tunnels that carry air into the coal layers and expose broad surfaces of coal to heat.

In this paper, five typical coal models intact coal, layered jointed coal, vertical jointed coal, orthogonal jointed coal, and synthetic jointed coal are established to simulate hydraulic fracturing in coal seam based on two-dimensional particle flow code (PFC2D).