Experimental Research On Co-combustion And Emission Characteristics Of Mixtures With Sewage Sludge And Coals

With the rapid development of economy and the improvement of people’s living standard, the urban sewage seems to be growing year by year. As product and pollutant of water treatment, the sewage sludge draws more and more people’s attention. Use of incineration is considered as the most promising treatment because it shows the unique advantages on Reducing the volume and weight, Eliminating the hazard and Recycling".So experiment study on combustion and emission characters of mixtures with sewage sludge and coal were investigated in this thesis.At first, the mixtures of conventional characteristics were analyzed. We could get the rule of the characteristics of the mixture, compared with coal and sewage sludge. Then a chosen sludge co-combusted with one coal with different mixing ratios was studied by thermal analysis method. Based on TG, DTG and DSC, the data analysis was carried out.The results showed that dried sludge had two weight loss peaks while the coal sample had one.At the first combustion stage of sewage sludge, there was a heat release delay compared with loss peak.The ignition and burnout performance of coal could be improved by blending with dried sludge while Comprehensive combustion characteristic index declines.Co-combustion reaction kinetics of blends are closely related to the sewage sludge. At the same time, the coal and sewage sludge keeps its own combustion characteristics. Then combustion experiments were carried out on the one-dimensional test furnace to study emission characters of different sewage sludge blend ratio in mixtures.Finally, General summary of the thesis and the further study was presented.