School of Energy and Environmental Engineering, Hebei University of Technology, Tianjin 300401, China.
Int J Environ Res Public Health. 2023 Jan 19;20(3):1890. doi: 10.3390/ijerph20031890.
In the production process of biomass energy with crop straw as the raw material, the indoor dust environment created by smashed plant fiber can affect the health of workers and lead to the risk of fire and explosions. The physical properties of biomass vary with the ambient air conditions, resulting in different deposition processes for airborne biomass particles. In this study, the deposition of biomass particles in different environments in an experimental chamber was examined by independently controlling the internal temperature and relative humidity. The results show that in the ambient temperature range of 2040 °C and at a relative humidity of 2565%, the water absorption rates of the biomass particles were 15.424.7%. The deposition rates of the airborne biomass particles with different sizes were 0.92.9 h, which positively correlated with the particle sizes in the same ambient conditions. The increase in ambient temperature and relative humidity promoted the deposition of biomass particles with diameters over 0.5 μm. For the particles with diameters below 0.5 μm, the deposition rates were nonlinearly related to the ambient temperature and relative humidity and were greater at lower temperatures. The significance levels of the factors influencing the particle deposition were particle size > ambient temperature > ambient relative humidity. For the biomass particles below 0.5 μm, the influence of the relative humidity on the deposition was much weaker than that of the temperature.
在以农作物秸秆为原料生产生物质能的过程中，粉碎后的植物纤维所形成的室内粉尘环境会影响工人的健康，并导致火灾和爆炸的风险。生物质的物理性质随环境空气条件而变化，导致空气中生物质颗粒的沉积过程不同。本研究通过独立控制室内温度和相对湿度，考察了实验室内不同环境下生物质颗粒的沉积情况。结果表明，在 2040°C 的环境温度范围内，相对湿度为 2565%时，生物质颗粒的吸水率为 15.424.7%。不同粒径的空气中生物质颗粒的沉积速率为 0.92.9 h，这与相同环境条件下的粒径呈正相关。环境温度和相对湿度的升高均促进了粒径大于 0.5μm 的生物质颗粒的沉积。对于粒径小于 0.5μm 的颗粒，沉积速率与环境温度和相对湿度呈非线性关系，在较低温度下沉积速率更大。影响颗粒沉积的因素显著性顺序为粒径>环境温度>环境相对湿度。对于粒径小于 0.5μm 的生物质颗粒，相对湿度对沉积的影响比温度弱得多。
