燃煤锻造加热炉有上、下排烟两种排烟方式。由于我厂锻工车间地质较差,若采用下排烟,则烟道因积水而影响排烟,故我厂锻造加热炉大都采用上排烟方式。过去,我厂上排烟的锻造加热炉是按传统的图纸将烟囱安放在预热段的拱顶上的。由于拱顶承受很大的载荷,加上热胀冷缩的影响,烟囱容易倒塌。更伤脑筋的是,进料口处的内炉门损坏及炉子大修时,往往要拆除烟囱,造 Coal forging furnace, smoke exhaust under two ways. As I plant forge workshop poor geological conditions, if the use of the next row of smoke, the flue gas due to the impact of smoke, so I plant forging furnace mostly used on the exhaust method. In the past, I used smokeless forge furnaces to place chimneys on domes of preheating sections according to the traditional drawings. As the dome to withstand a large load, coupled with the impact of thermal expansion and contraction, chimney collapse easily. More troubling is that the feed inlet at the furnace door damage and furnace overhaul, often have to remove the chimney, made