Abstract
The issue of the formation of wood dust particles in the work environment is still an actual topic in terms of its impact on employee health and the risk of fire or explosion in a woodworking operation. This article deals with the characteristics of spruce dust (Picea abies Karst. (L.)), which was taken from several types of wood technology. Experimental samples of spruce dust were taken from four types of sawing technologies, including grinding, briquetting and from the suction device container. The physical parameters of the samples taken were monitored and the particle size analysis was determined. The granulometric composition of the samples is significantly different. The sample of spruce wood dust from sawing has the most numerous fraction (250 µm), while the sample from grinding has the most numerous fraction 63–250 µm (87%).The aim of the paper was to monitor the minimum ignition temperature of the settled spruce dust layer and to look for a significant dependence of the minimum ignition temperature and ignition time on the type of spruce dust sample. A significant dependence was not confirmed. Significant moisture dependence of the samples was confirmed; the highest humidity was observed in the container, the lowest in sawing.
Highlights
The existence of explosions is based on the presence of a substance that reacts with oxygen at low ignition sources
Realization spruce wood dust saw line briquetting line container, storage of waste from the suction pipe one-time collection static random collection sampling was performed in the presence of an employee and each sample taken from under the lines, machinery and container was placed separately in the package and labeled the sample was taken from each sampled portion separately at 10 locations and 10 layers in the suction container wood dust from the sawing line with designation as WD_Saw wood dust from the briquette line with designation as WD_Briq wood dust from the extraction device with designation as WD_ExtrD
The determination of the minimum ignition temperature of spruce wood dust in a settled state was carried out according to the methodological procedure EN 50281-2-1: 2002 [52].A “hot-plate” test device for a deposited layer of dust (Figure 2) was used to measure the minimum ignition temperature
Summary
The existence of explosions is based on the presence of a substance that reacts with oxygen at low ignition sources. The wood industry is an example of an explosive environment. The permanent presence of wood dust particles in the atmosphere creates the risk of fire or explosion. The processes of sawing, planning, milling, grinding, trimming and other processing of wood mass or wood-based materials are applied Sydor et al [4]. Wood machines are most often driven by internal combustion engines, whose selected components are characterized by high temperatures, and this is associated with the danger of a machine or environment fire [5]
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