The utility model discloses a sludge drying system combined with the waste heat of the flue gas and the external heat supply. The system consists of heating system, sludge pretreatment system, feeding system, sludge drying and granulating system, a gas dust removal system, sewage treatment plant sludge through the system, after the two stage drying process, the moisture content is greatly reduced, the volume is reduced to 1/3 of the original, and the formation of grain diameter of 0.5 mm to 8 mm hard granular sludge, the sludge pellets can be used as auxiliary fuel coal, also can burn light energy saving brick and cement production pressure products. The utility model makes full use of waste heat resources of dry sludge, reduce sludge treatment cost for dry, city sewage treatment plant sludge harmless, reduction and recycling treatment provides a new way to waste recycling, waste, not only can produce significant social and environmental benefits, but also can obtain obvious economic benefits.
【技术实现步骤摘要】
【技术保护点】
一种烟气余热与外供热源相结合的污泥干化系统,其特征在于,它具有相连接的送料机(1)、输送带(2)、第一进料口(3)、第一回转烘干窑(4)、封闭式冷输送带(5)、切刻式粉碎机(6)、斗带式提升机(7)、第二进料口(8)、第二回转烘干窑(9)、筛分设备(22),沸腾炉(10)经第一通风管道(12)、第二风门(13)与第一回转烘干窑(4)的进气口相接,沸腾炉(10)与第二风门(13)之间设有温度调节器(11),第一引风机(15)经烟道(16)、第一风门(17)与第二回转烘干窑(9)的进气口相接,第一通风管道(12)与烟道(16)之间设有第三风门(14),第一回转烘干窑(4)、第二回转烘干窑(9)和封闭式冷输送带(5)的出气口经第二通风管道(18)与水膜除尘器(19)、第二引风机(20)、烟尘(21)相接。
【技术特征摘要】
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