Experimental Research Of The Co-combustion Of Sewage Sludge And Coal In A Circulation Fluidized Bed

Urbanization development and sewage industry development have brought about a soaring increment of sewage sludge, how to dispose the ever-increasing sewage sludge and eliminate their hazard has become a serious problem with which people are currently confronted. The final objective of sewage sludge is to meet the requirements of decrement, stabilization, detoxification, and the main tendency is energy and resources recycle. To conform to the new trend, incineration has become a promising disposal method. Whereas, sewage sludge is high moisture and low caloric fuel, which weakens the feasibility and economics of incineration. In order to spread the application of these new technologies, the co-combustion of sewage sludge and coal is being considered. So it's necessary to study on the characteristics of the co-combustion of sewage sludge in circulating fluidized bed.At first, we introduced the classification and harm and source of sewage sludge, the methods of disposal about sewage sludge and sewage sludge disposal present situation of our country summarized the research results about fluid-bed sewage sludge burn. On this foundation, we determined this paper content.We built aφ100 mm circulating fluidized bed incinerator. This paper introduced the system and structure of this test facility in detail. Passes through the cold functional test, we know the air resistance of air distribution dampers and the material layer resistance at the different thickness, and we analyzed the influence of air velocity on pressure along the height of the chamber, and did the test on the ignition way .These experiment discovery explain that the test facility accords with the design requirement.We carried out the ultimate analysis and industrial composition analysis of sewage sludge and coal for experiment, studied the co-combustion characteristics of sewage sludge and coal in CFB at the different sludge-coal rate, and tested the emission of second contaminant in the incineration process. Through co-combustion of sewage sludge and coal in CFB incinerator, we understand and grasp the operation and emission characteristics of sewage sludge incineration in the CFB incinerator.The conclusion from above experiment are helpful to the development of co-combustion disposal methods of sewage sludge and supply valuable reference date for more research about sewage sludge co-combustion with coal in CFB.