铸管厂球墨铸铁管烘干炉技术改造

Technical Innovation of Nodular Cast Pipe Drying Furnace in the Cast Pipe Plant

随着铸管机的生产能力从14万吨增加到20万吨,烘干炉已不能满足生产与工艺要求,铸管出炉温度只有40℃左右,无法烘干固化表面防腐层,导致表面质量较差。在减少投资和运营成本的前提下,对烘干炉的燃烧系统、热风循环系统、控制系统进行改造。在不改变炉体整体结构与尺寸的情况下,把原有加热与循环系统分离的方式改为加热循环一体式。热风系统由原来的从头部到尾部的大循环方式改为上下对吹,中部回风的方式,提高风速及对流换热系数,使炉温从50℃升高到了100℃,铸管出炉温度达60℃以上,保证了扩能后的生产能力。

As production capacity of casting machine increasing from 140 thousand ton to 200 thousand ton , effi-ciency of drying furnace was not sufficient for production and technical need , iron pipe discharged from furnace was on-ly 40℃that corrosion preventive layer of solidification surface could not be dried and result in bad quality .In order to reduce investment and operation cost , the heating system , thermal wind circulation system and control system of drying furnace have been conducted innovation .In the case of unchanged integral structure and size of furnace body , the pri-mary heating and circulation separation mode was changed to the heating and circulation unity mode which was that the original large cycle way from top to bottom was improved to the mode of blow up and down and middle return air , which made furnace temperature increase from 50℃ to 100℃ and therefore temperature of cast pipe could exceed 60℃ to guarantee production capacity expansion .