摘要
从理论、实验和现场试验3个方面对高压喷雾雾化粒度的降尘性能做了深入的研究;对高压喷雾降尘机理进行了分析,提出了雾化粒度D50的计算式和雾化粒度捕捉最小粉尘粒度的相互关系式;利用测试范围在5～2 000μm的Winner313激光粒度分析仪和喷嘴雾化测试系统,对煤矿常用的5种压力式喷嘴进行了4,6,8和10MPa共4个压力下的雾化粒度测定,得到了喷嘴雾场不同位置的D10,D50,D90,D[3,2],D[4,3]平均粒径分布和650μm以下的粒径分布,雾场位置(150-9)处的粒径随压力增加雾化粒度变小;根据理论、实验数据和综放工作面煤尘实际测定的粒径分布,确定了该面的喷雾降尘压力和喷嘴型号,通过现场应用,煤机外喷雾和支架喷雾压力从2MPa提高到8MPa后,移架工序的全尘由536.2mg/m3降到97mg/m3.
Dust suppression by the wetting of particles occurs when moisture condenses on them.The size of the atomized water is the key to dust suppression under these conditions.This article reports on a study of dust suppression efficiency as a function of atomization.Theoretical,experimental,and field tests are discussed.A formula for atomized droplet size,D50,and the relationship between droplet size and dust particle size was developed.An experimental system for testing the atomization was developed.The nozzle test system and a Winner 313 laser particle size analyzer were used to determine the atomized particle size distribution.The measured size ranged from 5 to 2 000 micro-meters and the tested atomization pressures were 4,6,8,and 10 MPa.The distribution of particles smaller than 650 micro-meters was of particular interest.The theoretical results and the laboratory experiments allowed a nozzle and pressure for use at a fully-mechanized caving face to be selected.Subsequent field application showed that increasing the atomization pressure at the coal cutter and between the supports from 2 MPa to 8 MPa caused the dust content in the air to decrease from 536.2 mg/m3 to 97 mg/m3.
出处
《中国矿业大学学报》
EI
CAS
CSCD
北大核心
2011年第2期185-189,206,共6页
Journal of China University of Mining & Technology
基金
教育部新世纪优秀人才支持计划项目(NCET-06-0606)
国家自然科学基金项目(51074100)
山东省自然科学基金项目(ZR2010EM016)
山东科技大学科研创新团队支持计划项目(2010KYTD106)
关键词
喷嘴雾化
粒径
雾化实验
压力
nozzle atomizing
particle size
atomization experiment
pressure
