Research Article

Study on Change Rules of Factors Affecting Gas Loss during Coalbed Air Reverse Circulation Sampling

Table 2

Particle size distribution after the mixed coal sample tests.

Sample size≤1 mm (%)1–3 mm (%)3-4 mm (%)4-5 mm5-6 mm6-7 mm7-8 mm

1 # coal sample62.3232.542.061.83%1.24%00
2 # coal sample65.9129.423.970.70%000
3 # coal sample64.7429.413.6102.24%00
4 # coal sample64.8228.055.331.11%0.69%00