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Study On Co-Combustion Power Generation Of Municipal Solid Waste With Biomass And Flue Gas Purification

Posted on:2008-02-28Degree:DoctorType:Dissertation
Country:ChinaCandidate:H W JieFull Text:PDF
GTID:1102360272985615Subject:Thermal Engineering
Abstract/Summary:PDF Full Text Request
The power generation of municipal solid waste(MSW) incineration has been applied widely for solving MSW pollution progressively and relaxing energy sources crisis. The coal and fuel are joined as combustion-supporting sources for the lower calorific value of MSW in China at present. This practice wastes other energy soueces when the MSW are putted away. Therefore, a serial systematic and comprehensive study on co-combustion power generation of MSW with biomass is expanded in this dissertation.The main work and results are listed as follows.1. Experimental investigation on the co-combustion characteristic.The combustion characteristic of the mixture has been analyzed base on the experimental phenomenon and data. i)The furnace temperature increases with the increasing of the primary air ratio,the blended ratio(w%) and the feed-in quantity.But it decreases when the excess air coefficient increases. ii)The combustion efficiency increases when the parameters in terms of the primary air fraction,the furnace temperature and the blended ratio(w%).But it increases firstly and then decreases with the increasing of the excess air coefficient. iii)Compared with the air combustion loss and the solid combustion loss,the effect of the solid combustion loss is more bigger.iv)The direct economic benefits of one unit is 711.15yuan/h after the co-combustion of MSW with biomass.2. Experimental investigation on the emission characteristic of contaminations.The diversification principle of contaminations emission with the blended ratio(w%) and the furnace temperature is analyzed. i)When the blended ratio(w%) increase,the emission concentration of HCl,CO,fly ash and PCD in flue gas decrease,and the emission concentration of SO2 and NOX increase slightly,and metals of Pb,Cr,Zn,Cu in both fly ash and bottom ash decrease. ii)When the furnace temperature increase,the emission concentration of NOX increase slightly, SO2,CO,PCD decrease,HCl and fly ash is not change, metals of Pb,Cr,Zn,Cu in bottom ash decrease,and metals in fly ash increase.3. Experimental study on purification of flue gas by rotating spray drying.An experimental system, for purifying flue gas of waste incinerators by rotating spray drying, has been set up, which takes into account the particular fact, that the gas quantity is small and contains relatirvly little SO2, but relatively much HCl.The influence, of the main controllable system dsign and operation parameters, on desulphurization and dechlorination efficiency have been test determined. i)The rotating spriay drying method is more dfficient in dechlorination and less in desulphurization.ii)The dechlorination and desulphurization increase when the stoichiometry ratio(SR),the temperature of flue gas and the concentration of SO2 increase or the velocity of flue gas,the concentration of lime slurry decrease,and when the concentration of HCl increase,the desulphurization increases firstly and then decreases.iii)The velocity of flue gas,the stoichiometry ratio(SR) and the concentration of lime slurry have more dfficient in dechlorination,the trend of its diversification is same with desulphurization,but the extent of its diversification is less; the concentration of contamination and the temperature of flue gas have less efficient in dechlorination.4. A model of flue gas cleaning is setted up.For optimizing the flue gas cleaning systems, a model was developed by Computational Fluid Dynamics to simulate the flue gas cleaning by the spray dryer of a waste incineration power plant. In this model, the momentum, energy, turbulence and composition equations of flue gas, the momentum equation of slurry droplets, and evaporation and cleaning models of droplets were solved together. The efficiencies of desulphurization and dechlorination were obtained. The effect of pollutants concentration entering the spray dryer, gas velocity, slurry concentration, and stoichiometric ratio on the removal efficiencies of HCl and SO2 were investigated by this model. The removal profiles of them along the reactor's height were presented. And these simulation results were compared with the experimental data. Results show that the model can be used to evaluate the removal efficiencies of HCl and SO2 of the gas cleaning system with a error less than 5% between simulated results and measured values.
Keywords/Search Tags:municipal solid waste (MSW), biomass, co-combustion, pollutant emission, model
PDF Full Text Request
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