Advances in Civil Engineering

Research Article

Experimental Investigation on Atomization and Dustfall Characteristics of Combined Nozzles for Shearer External Spray in Fully Mechanized Coal Mining Face

Average dust concentration at different measuring points at the coal dust source.


Measurement point	Nondust-proof measures		Open traditional spray		Opening a new type of external spray unit (distance between nozzles)/mm
	Nondust-proof measures		Open traditional spray		150		200		250
	Total dust concentration (mg/m³)	Respirable dust concentration (mg/m³)	Total dust concentration (mg/m³)	Respirable dust concentration (mg/m³)	Total dust concentration (mg/m³)	Respirable dust concentration (mg/m³)	Total dust concentration (mg/m³)	Respirable dust concentration (mg/m³)	Total dust concentration (mg/m³)	Respirable dust concentration (mg/m³)

1#	774.0	376.1	305.2	143.7	227.5	115.4	148.5	70.3	179.2	84.9
2#	993.4	482.8	382.9	186.4	278.3	136.7	171.6	80.2	194.5	97.3
3#	435.6	221.9	223.6	104.1	140.7	67.1	95.2	40.7	109.4	47.8
4#	262.1	118.7	132.7	64.7	82.2	41.5	60.4	24.0	68.9	30.6
5#	217.5	103.4	94.3	46.5	64.8	30.2	47.3	22.1	52.0	25.7