Study On Characteristic And Comprehensive Utilization Of Circulating Fluidized Bed Ash

The burning technique of circulating fluidized bed(CFB) is a new technique, which have the advantages of wide adaptability of fuel, high rate of burning, low quantity of NOx senting out, wide load adjust. With the developing of electric power, the burning technique of CFB will become the main burning technique. At the same time, it will bring the new solid waste, circulating fluidized bed ash. At present, there are a few of reports about comprehensive utilization of circulating fluidized bed ash, especiallly, there is not high technique or high income research. In this paper, in allusion to the comprehensive utilization of circulating fluidized bed ash, we try to find a route of reasonable utilization. The components, structures and properties of circulating fluidized bed ash have been investigated by XRD, laser granularity apparatus and rapid analysis instrument of silicate. The analysis results show that the CaO,SO3 and burning loss were large for middle temperature burning and adding of limestone as desulfrize reagentat the time of burning, there were no mullite, and the Al and Si were active. According to their characters, in the paper, the method of acid disolving was used to extract Al, and synthesized the PAFC flocculate reagent by polymerization reacting. At meanwhile, amorphous silica were synthesized using silicon extracting from leavings.Experiments contain three parts of acid dissolve, polymerization and preparation of amorphous silicate. The rate of Al dissolve is the critical index, which has effects on the produce. Accordingly, the cross experiments were performed to study the effects of propation of acid and ash, reaction temperature, time and granularity on the rate of Al dissolve. The results were dealed with by pole dispatch method. The results showed that the factors of affect the dissovle of Al are as follows:temperature, granularity, time and...