利用篦冷机余热高效烘干改性造纸白泥制备水泥混合材的试验研究
发布时间:2018-07-28 09:59
【摘要】:造纸苛化白泥的主要矿物相为碳酸钙,其含量达90%以上,与石灰石具有类似的化学和矿物组成,且颗粒特别细小,无需单独破碎和粉磨,非常适合用作水泥混合材。同时,白泥含水率高(45%~60%),若单独烘干,则大量的投资和巨大的能耗会成为制约其在水泥行业应用的瓶颈。水泥生产线冷却系统中,在篦冷机第三段尾端产生的废热(大约160~250℃)既未进入余热发电系统也不能进三次风管,白白浪费。本文通过“以废(气)治废(泥)”的思路和方式,充分利用篦冷机第三段尾端废气余热和水泥熟料冷却潜热实现白泥快速和持续烘干,一步解决白泥的加料、烘干及混合等关键技术问题。中试试验共进行6天,消耗白泥(干基)240吨,生产水泥1.2万吨,其中4000吨普通硅酸盐水泥P.O42.5,8000吨复合硅酸盐水泥P.C32.5,二者白泥掺量分别为0.4%和1.6%。主要结论如下:1.对两种型号水泥的工作性能,力学性能以及硫酸盐侵蚀性能的实验结果表明:白泥的掺入对普通水泥和复合水泥综合性能均未产生显著影响。产品投放市场后并未出现异常。2.白泥的配入可显著降低出篦冷机熟料和废气的温度,同时,随配入速率的增大,废气温度有一定回升,而熟料温度有下降趋势。通过计算可知,白泥配入对篦冷机的热效率影响较小,但可显著降低单位熟料热耗。3.利用篦冷机废气余热烘干白泥工艺属于集成创新技术,其优势在于:投资小,收益显著,且风险可控。具体来说:一条2500t/d的水泥熟料生产线仅需增加投资45~50万元,则可处理造纸白泥5万吨/年,可为合作企业增效407.5万元/年。依此推算,若四川省每年近100万吨造纸白泥全部采用该技术进行资源化利用,需投入20条生产线,固定资产投资约2000万元,可实现增效8150万元/年。
[Abstract]:The main mineral phase of caustic white mud is calcium carbonate, the content of which is more than 90%. It has similar chemical and mineral composition with limestone, and the particles are very small, so it is suitable for cement mixing material without separate crushing and grinding. At the same time, the high moisture content of white mud (45%), if drying alone, a large amount of investment and huge energy consumption will become the bottleneck of its application in cement industry. In the cooling system of cement production line, the waste heat generated at the end of the third stage of the grate cooler (about 160 ~ 250 鈩,
本文编号:2149728
[Abstract]:The main mineral phase of caustic white mud is calcium carbonate, the content of which is more than 90%. It has similar chemical and mineral composition with limestone, and the particles are very small, so it is suitable for cement mixing material without separate crushing and grinding. At the same time, the high moisture content of white mud (45%), if drying alone, a large amount of investment and huge energy consumption will become the bottleneck of its application in cement industry. In the cooling system of cement production line, the waste heat generated at the end of the third stage of the grate cooler (about 160 ~ 250 鈩,
本文编号:2149728
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