Carbon Monoxide & Wax-fume Protection at Burnout
焙烧炉一氧化碳与蜡烟的职业防护
标签：一氧化碳, 蜡烟, 焙烧炉, 职业健康
蜡在焙烧炉内热解产生一氧化碳、甲醛与多环芳烃，炉体必须接金属烟道外排并保持炉房微负压，CO 报警器一级值设 25 ppm；优先选蒸汽脱蜡减少明火烧蜡。熔蜡锅与修蜡台上方装顶吸罩，罩面风速 0.5 m/s 以上。某加拿大艺术铸造工坊曾因烟道堵塞致三人轻度中毒，此后规定：每次焙烧前用烟雾示踪检查抽力，每半年更换 CO 传感器。长期接触蜡烟者建议每年做肺功能检查并建立职业健康档案。
Wax pyrolyzing in a burnout furnace releases carbon monoxide, formaldehyde and PAHs: duct the furnace outdoors in metal flue, hold the burnout room slightly negative, and set CO first alarms at 25 ppm; prefer steam dewaxing to open-flame burnout. Fit canopy hoods over melt pots and wax benches at 0.5 m/s face velocity or better. After three mild poisonings from a blocked flue, one Canadian art foundry made it policy to check flue draft with a smoke tracer before every burnout and replace CO sensors every six months; staff exposed to wax fume get annual lung-function tests on file.