Design And Optimization Research Of The Entrained Flow Combuster With Multiple Reaction Segment System

During the process of coal combustion, large amount of pollutant is produced, such as SO₂,NOx,CO₂ etc, and harmful toxic trace metal elements are released, such as Hg,Pb,As,Se etc,which do great harm to the eco-enviroment and human health. Consequently, the coal-fired pollution problems become more and more urgent. At present,most NOx can be removed from flue gas by controlling the combustion reaction conditions and putting additives into the furnace while some SOx and mercury also can be removed at the same time. Furtherly,It is more significant that this technology is used with other moderate and low-temperature combustion pollution control technologies, so this can greatly reduce the costs of removal of pollutants in the boiler and get good economic benefits.Controlled by combustion reaction conditions and additives put into removal of most of the NOx, and to some extent on the removal of SO₂ and mercury. Further with the other the moderate and low-temperature combustion pollution control technologies, we can greatly reduce the costs of removal of pollutants in the boiler and get good economic benefits.First of all, in this paper the background and present state of subject research about combustion tenologies of control pollutants in domestic. home and abroad are discussed, introducing the significance of combuined removal the NOx,SO₂,Hg at high temperature in the boiler. Refering to the Entrained Flow Reactor in University of Stuttgart, the Entrained Flow Combuster with Multiple Reaction Segment versatile experiment system was designed and built. The experiment system could do research on combined removal of NOx,SO₂,Hg in furnace simulataneously, including reactor furnace, the feeding system, temperature control system, gas supply system, the sample analysis system, cooling system and exhaust emission system etc.In order to get the total functions of the experiment system, much experiment of debug system was done, including the tests of air-tightness,oil cooling system and feeding system, what's more, calibration experiment of the furnace temperature,slagging experiment and combustion characteristics of coal. During the experiment, some problems such as deflagration when feeding large amount of coal,heterogeneous mixtures of the furnace wind were discovered. In order to optimize the system, adding the two sides secondary air measure in the furnace and doing numerical simulation of the reformed structure. By analyzing the results of cold numerical simulation results and the horizontal sections and the center sections mole fraction of O₂, CO, CO₂, we got the most optimal program.The result of doing experiment at the reformed structure prove the optional method can effectively improve the heterogeneous mixtures of the furnace wind problem and combustion conditions.