含水率对铣削木粉尘质量浓度和粒径分布的影响

Effect of Moisture Content on Mass Concentration and Particle Size Distribution of Milling Wood Dust

木材加工产生的木粉尘严重影响从业人员的健康与环境。为有效解决这一问题,以辐射松和红橡为研究对象,对5%、10%、35%三种含水率木材铣削过程中产生的细小粉尘质量浓度与沉降性粉尘进行监测,研究含水率对粉尘质量浓度分布、粒形粒径的影响。研究表明:两种木材在铣削过程中产生的粉尘粒径大多小于100μm;含水率对两种木材粉尘颗粒形态均无明显影响;纤维饱和点范围内,两种木材的粉尘质量浓度与含水率呈负相关,粉尘中值粒径与含水率呈正相关。在工艺条件允许的情况下,适当提高含水率,可以降低粉尘质量浓度、减小粉尘粒径,从而实现降尘的目的。研究结论可为后续除尘设备的设计与安装提供一定的理论依据。

Wood dust produced by wood processing seriously affects the health and environment of workers.In order to solve this problem effectively,radial pine and red oak were selected as research objects.The moisture content of wood at 5%,10%and 35%were selected to monitor the fine dust mass concentration and settling dust produced by milling.And the effects of moisture content on the dust mass concentration and particle size distribution were studied.The results showed that:the particle size of the two kinds of wood during milling was less than 100μm;the moisture content had no obvious effect on the particle morphology of the two kinds of wood dust;in the range of fiber saturation point,the dust mass concentration of the two kinds of wood was negatively correlated with the moisture content,while the dust particle size was positively correlated with the moisture content.Under the condition that the process conditions permit,the appropriate increase of the moisture content can reduce the dust mass concentration and particle size,so as to achieve the purpose of dust reduction.The research could provide a certain theoretical basis for the design and installation of subsequent dust removal equipment.