关键词：空气污染；空气污染控制；加工材料；粒子排放
摘 要：This case study was completed in response to a company request to investigate the release of carbon nanotubes (CNTs) during cutting and sanding of composite panels containing CNTs. To evaluate the release of CNTs, a ventilated enclosure was built to capture and mix the emissions from sanding and cutting composite panels. The ventilation system consisted of a partial enclosure around the band saw, a metal duct, and a clean air machine that provided air flow and filtration. The volumetric air flow through the test system was 1,072 cubic feet per minute (cfm), with a hood face velocity of 197 feet per minute (fpm). The panel sanding and cutting was performed inside the hood face to reduce workers dust exposure and to capture emissions for characterization. The process emissions were well mixed because of the inclusion of a baffle and a 90DG elbow upstream of the sampling location. A portable air exhaust system exhausted air through the enclosure, the 90DG elbow, and the 12-inch-diameter duct.