Microwave Thermal Conversion Process Design And Test Of Oily Sludge

With the rapid development of the petroleum industry, it brings moreand more serious environmental problems. A large of oily sludge producedin pretroleum industry seriously pollutes the surrounding environment. Thiskind of oily sludge also contains valuable oil resources. However, it isgreatly significant to treat oily sludge with recovery of oily sludge.In present paper, apparatus for oily sludge of microwave heat treatmentwas designed and built. The process of oily sludge of microwave heattreatment consists of six functional parts: the feeding system, heat treatmentsystem, distillate condensation and separation system, thermal oxidationtreatment system, non-condensable gas detection system, process monitoringand control system.Feeding system，which is used for crushing and mixing oily sludge，can transport oily sludge to microwave pyrolysis system at max10kg/h.Microwave pyrolysis furnace is controlled by program， the operatingtemperature of which is up to800℃. Refrigeration system can ensure thetemperature of cooling water to reach5℃, and the high temperature flue gases can be effectively condensed. The temperature of thermally oxidizedsystem can be controlled up to500℃, and the exhaust gases from thermallyoxidized system can effectively be washed and cleaned by the scrubber,finally the exhaust emits at the standard; non-condensable gases canautomatically be collected for samples online and analysised for theircomponents. The process can effectively be controlled and the process datacan be collected, recorded and stored.Experimental results show that feeding ways have very significantimpact on the temperature distribution inside microwave heat treatmentreactor. when microwave heat treatment apparatus was feeded at one time,the temperature increased at first and then reduced from the top to bottom ofthe reactor. Temperature is highest at the center of reactor. If it was feededcontinously, the temperature continuously increased from the top to bottomof the reactor. At the bottom of reactor the temperature is highest. Additionof microwave absorbent significantly increased the outputs of condensatedliquids and non-condensable gases, and improved the treatment efficiencyof oily sludges.