公开(公告)号：US5215670A

公开(公告)日：1993-06-01

申请号：US801656

申请日：1991-12-02

申请人： Mark J. Girovich

发明人： Mark J. Girovich

IPC分类号： F26B1/00 ,  F26B7/00 ,  F26B17/00 ,  F26B23/00 ,  F26B23/02

CPC分类号： F26B1/00 ,  F26B17/003 ,  F26B23/002 ,  F26B23/022 ,  F26B7/00 ,  F26B2200/18 ,  Y02P70/40 ,  Y02P70/405

摘要： Dewatered municipal sludge is dried and simultaneously pelletized in an indirect dryer. A sweep air is introduced into the dryer to extract a water vapor and air mixture. The water vapor and air mixture is condensed and cleaned in a condensor and a scrubber to obtain a clean non-condensable gas. The non-condensable gas is heated and recycled to the dryer after heating for use as the sweep air. Since air leakage into the system is inevitable, an excess amount of air accumulates that does not need to be recycled to the dryer. The excess amount of air is diverted from the recycled sweep air and thermally treated to destroy any malodorous gaseous constituents contained therein. Preferably, the indirect dryer is a horizontal drum dryer that is heated by the hot flue gases from a combustion furnace. The condenser for condensing the water vapor and sweep air mixture extracted from the dryer is cooled by the liquid sludge entering the dewatering treatment phase of the process, and the waste flue gas from the furnace is used to heat the recycled sweep air in order to save energy by recovering waste heat of the system.

摘要翻译： 将脱水的城市污泥干燥并在间接干燥器中同时造粒。 将吹扫空气引入干燥器中以提取水蒸汽和空气混合物。 将水蒸汽和空气混合物冷凝并在冷凝器和洗涤器中清洁以获得清洁的不可冷凝气体。 不可冷凝气体在加热后被加热并再循环到干燥器中以用作吹扫空气。 由于空气泄漏到系统中是不可避免的，所以积聚过量的空气不需要再循环到干燥器中。 过量的空气从回收的吹扫空气中转移并进行热处理以破坏其中所含的任何恶臭气体成分。 优选地，间接干燥器是由来自燃烧炉的热烟道气加热的水平滚筒干燥器。 用于冷凝从干燥器中提取的水蒸气和吹扫空气混合物的冷凝器被进入脱水处理阶段的液体污泥冷却，并且来自炉的废烟气用于加热再循环的吹扫空气以便节省 通过回收系统的余热来节能。

公开(公告)号：US5069801A

公开(公告)日：1991-12-03

申请号：US484523

申请日：1990-02-26

申请人： Mark J. Girovich

发明人： Mark J. Girovich

IPC分类号： F26B1/00 ,  F26B7/00 ,  F26B17/00 ,  F26B23/00 ,  F26B23/02

CPC分类号： F26B17/003 ,  F26B1/00 ,  F26B23/002 ,  F26B23/022 ,  F26B7/00 ,  F26B2200/18 ,  Y02P70/405

摘要： Municipal sludge is dried in an indirect heating dryer to simultaneously dry and pelletize the sludge while preventing the escape of malodorous gases. The product exiting the dryer contains pelletized, undersized and oversized fractions. The dried product is classified to separate the undersized and oversized fractions from the pellets. The pellets are then cooled and stored for subsequent use as a fertilizer or fuel. The oversized fraction is crushed to obtain fines and mixed with the undersized fraction, which contains mostly fines. The fines are added to the liquid sludge before it is input to the dryer. The air that is used to cool the pellets, and that is used as sweep air in the dryer contains malodorous gases. In order to prevent the escape of these malodorous gases, the pellet cooling air and sweep air, which also includes the water vapor generated during the drying of the sludge, is deodorized by thermal treatment, preferably in a high temperature combustion zone.

摘要翻译： 城市污泥在间接加热干燥器中干燥，同时干燥和造粒污泥，同时防止恶臭气体逸出。 离开干燥机的产品包含颗粒状，尺寸过小和过大的部分。 将干燥的产品分类成从颗粒中分离尺寸过小和过大的部分。 然后将颗粒冷却并储存以供随后用作肥料或燃料。 将过大的部分压碎以获得细粉，并与含有大部分细粒的小尺寸部分混合。 在将液体污泥输入干燥器之前，将细粉加入到液体污泥中。 用于冷却颗粒的空气，并且用作干燥器中的吹扫空气包含恶臭气体。 为了防止这些恶臭气体的逸出，还包括在污泥干燥期间产生的水蒸气的颗粒冷却空气和吹扫空气通过热处理，优选在高温燃烧区域进行除臭。