| Taking a sludge sample from a wastewater treatment plant in Shanghai as an example,influence of moisture content on sludge drying and incineration process was investigated by theoretical calculation and engineering design analysis.The results showed that increasing the degree of drying resulted in increased processing capacity of the drier and thus the model selection of drier became limited.The requirements for incinerator,heat recovery steam generator and other equipment were improved.For the sake of security,the demands for the equipment material,system installation,operation and management were improved as well.With the reduction of the degree of sludge drying,the feeding rate and flue gas flow became larger,leading to huge bulk of the incinerator and flue gas treatment equipment.Due to the changes of sludge properties over time,some risks existed when the sludge moisture content of 60% was selected in some areas,the sludge heating value of which was low.The sludge moisture content had a great influence on the selection and arrangement of incineration process.The copy from similar projects at home and abroad should not be allowed during the engineering design of sludge incineration process.A reasonable moisture content of the sludge should be selected according to the local conditions such as sludge properties,heating value,auxiliary heat source and so on. |
