ABSTRACT

High-efficiency dust collection for open dust source has always been an important and difficult issue for air quality control at the workplace. This study performed simulations and experiments on three kinds of dust exhaust hoods, namely, updraft, side-draft and air-curtain exhaust hoods. Results show these three kinds of exhaust hoods varied significantly in dust-capturing efficiency. The dust-capturing efficiency of the updraft exhaust hood was the lowest (56.8%) while the air-curtain exhaust hood performed best in dust collection, with a dust-capturing efficiency of 93.8%. For a rectangular air-curtain exhaust hood with a size of 900 mm x 1200 mm, the dust-capturing efficiency first increased and gradually tended to stabilize with increasing air-curtain velocity and suction airflow rate. According to the present research results, the reasonable long-side air-curtain velocity and suction airflow rate were in the range 4 ~ 6.27 m/s and 5.4 ~ 9 m³/min, respectively. Under these conditions, dust-capturing efficiency can be as high as 79.6–86.5%.

Implications: This study performed simulations and experiments on three kinds of dust exhaust hoods: updraft, side-draft and air-curtain. Simulation results show the dust-capturing efficiency of the air-curtain exhaust hood is best of 93.8%. Experimental results show under reasonable conditions, the dust-capturing efficiency of a rectangular air-curtain exhaust hood is 79.6–86.5%. This research is very meaningful, which not only has important innovation in the study of micro mechanism of dust collectors but provides powerful theoretical and experimental support for technological innovation.

摘要

对于开放式粉尘源而言，高效的粉尘收集一直是工作场所空气质量控制中一个重要而困难的问题。这项研究对三种类型的排尘罩进行了模拟和实验，即向上气流，侧面气流和空气幕式排风罩。结果表明，这三种排气罩的捕尘效率差异很大。上吸式排风罩的集尘效率最低（56.8％），而空气帘式排风罩的集尘效率最高，除尘效率为93.8％。对于尺寸为900 mm x 1200 mm的矩形空气幕式排风罩，随着空气幕速度和吸风量的增加，集尘效率首先增加，然后逐渐趋于稳定。根据目前的研究结果，³ / min。在这些条件下，除尘效率可高达79.6–86.5％。

启示：这项研究对三种排尘罩进行了仿真和实验：上排风，侧排风和空气幕。仿真结果表明，空气幕式排风罩的集尘效率最高为93.8％。实验结果表明，在合理的条件下，矩形风幕排风罩的集尘效率为79.6–86.5％。这项研究意义重大，不仅对集尘器微观机理的研究具有重要的创新意义，而且为技术创新提供了有力的理论和实验依据。