- Coal is first gasified in a simulated underground environment.
- They are picking over the cinders in the rubbish heap for unburned pieces of coal.
- The coal has been burnt to cinders.
- A laborer takes a rest on a cinder dumpsite in Changzhi, China.
coal box coal Coal Characteristic-Furnace Lines Coupling coalbed methane exploitation and utilization Coal property evaluation with standardization coalescence inclined plate sedimentation tank Coal Enterprises'Boundary and its Inspirations Coalmine Mechanical Equipment Expanding Project coal resource-exhaustion and city declination coal-pulverizing system with middle-storage coal-controlling thrust-faulted tectonic zone