Numerical Simulation Of Adsorbent Cake On The Filter Removaling Elemental Mercury

With the rapid development of the global economy, the rapid increase in the demand for coal fuels. Coal combustion flue gas in gaseous mercury content increases, the mercury will affect plants and animals, and people’s health. So the coal-fired mercury pollution control problem is a hot global environmental issue, China also attaches great importance to this.This thesis systematically reviewed the theoretical study of the present situation and progress gaseous mercury removal. Injected into the adsorbent combination bag-house mercury pollution control technology, has been considered a good mercury control method used in coal-fired power plants. Adsorbent particles injected into the flue bag surface, can be well attached to the adsorbent layer is formed, is conducive to the further removal of mercury in the flue gas. Therefore, this paper focuses on the flue gas is injected into the activated carbon adsorbent t layer formed on the bag filter for removal of gaseous mercury.Firs, in order to create two-dimensional porous media adsorption isotherm mass transfer model to the case of activated carbon adsorbent layer macro adsorbent layer of mercury adsorption. Then the mathematical model has been calculated using FLUENT software, in which the mercury adsorption process by means of the UDF, the adsorbent layer formed on the bag for mercury removal process. Analog:the temperature of the adsorbent for removing gaseous mercury adsorption amount of value has little effect (the amount of adsorption/adsorption capacity); porosity, filtration rate and inlet concentration changes can have a significant impact on the adsorption amount of value.Secondly, the establishment of two-dimensional adsorbent layer removal of gaseous mercury control mathematical model, the mass transfer resistance to inter-phase mass transfer as the adsorption process, analysis of the mass transfer of mercury removal influencing factors, the use of mathematical software MATLAB mathematical model solution. Only to consider rumor qualitative resistance BPL activated carbon, for example, the adsorbent layer in the inlet concentration in50200μg/m3, speed0.5～3m/min, porosity within the range of0.3to0.6, and taking off mercury removal in addition to the efficiency between30%to80%.