Dust Concentration Changing Regularities and Dust Reduction Technology by Spray Negative Pressure in Fully Mechanized Mining Face

Table 1

Nozzles used in atomization characteristic experiment.

Type	No.	Orifice diameter (mm)	Fog flow shape	Atomization type	Physical picture
A	1#	1.1	Sector	Cone-shaped guide groove direct type
	2#	1.4
	3#	1.6
B	4#	1.6	Solid cone	Mixed type with X-shaped guide core
	5#	2.0
	6#	2.4
C	7#	1.2	Hollow cone	Side guide hole centrifugal
	8#	1.6
	9#	2.0
	10#	2.4
D	11#	1.6	Square solid cone	Hybrid type with cross opening and X-shaped guide core
	12#	1.9
	13#	2.4
E	14#	2.3	Solid cone	Mixed type with X-shaped guide core
	15#	2.8
	16#	3.2