Research Article
An Improved Composite Fly Ash Gel to Extinguish Underground Coal Fire in Close Distance Coal Seams: A Case Study
Table 3
Technological parameters of injection gel.
| | No. | Filled area | Amount of colloid injected (m3) | Quality ratio of water and fly ash | Addition amount of gelling agent (%) | Addition amount of suspending agent (%) | Operating mode | Main purposes |
| | 1 | Abandoned roadway | 9000 | 1 : (1–1.5) | 0.1 | 0.3 | Discontinuous glue injection. 3-4 hours of injection, pause for about 1 hour | Fully exfoliate the water in the colloid to increase the colloid accumulation rate |
| | 2 | Existing masonry roadways | 1350 | (1–1.5) : 1 | 0.3 | 0.3 | Continuous large amount of glue injection | Increase the fluidity and coverage of colloids in the cracks of high-temperature coal to improve the fire extinguishing effect |
| | 3 | Roof falling zone and goaf area | 5000 | (1–1.5) : 1 | 0.1 | 0.3 | Discontinuous glue injection. 1 hour of injection, pause for about half an hour | Release water from the colloid and fill the fissure with solid material as much as possible |
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