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我国工业炉安装换热器已很普遍,但换热器过烧现象时有发生。轻者需停产维修,重者换热器被烧毁,既经济受损,还影响生产。我厂2号井式燃油热处理炉(下排烟)原有1台高效喷流换热器(材质为普碳钢),由于炉内燃烧不完全,烟道中曾发生数起突发性着火而烧坏了换热器。为了防止此类事故发生,在该炉上安装了自动控温装置,实现了超温保护,取得了满意效果。装置由热电偶、温度仪表、继电器和报警器组成(图1)。继电器线路分别接仪表、报警器和引风机。
China’s industrial furnace heat exchanger installation has been very common, but the phenomenon of overheating heat exchanger have occurred. Light to be discontinued maintenance, heat exchanger was burned in severe cases, both economic damage, but also affect the production. I plant No. 2 well-type fuel heat treatment furnace (the next row of smoke) the original one high efficiency jet heat exchanger (made of carbon steel), due to incomplete combustion furnace, the flue occurred in a number of sudden fire and Burn out the heat exchanger. In order to prevent such accidents, automatic temperature control device is installed on the furnace to achieve over-temperature protection and achieve satisfactory results. The device consists of thermocouples, temperature meters, relays and alarms (Figure 1). Relay lines were connected meter, alarm and induced draft fan.