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Characteristics of Particulate Formation for Removal of SO2 from Flue Gases by Corona Discharge Radical Shower Non-Thermal Plasma Systems

机译:电晕放电自由基喷淋非热等离子体系统去除烟气中SO2的颗粒形成特征

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摘要

[[abstract]]The corona discharge radical injection system for treatment of NO x and SO2 has been investigated and demonstrated to improve significantly removal efficiency, energy efficiency, by-products yield etc. In the corona discharge radical injection technique, corona discharge is generated in front of a hollow electrode where ammonia, hydrocarbon, steam, oxygen, nitrogen, etc., were injected, Therefore, we can select radicals required for pollution gas treatments and minimize activations of unwanted flue gas components [1]. One of the mechanism of the corona radical shower system is that adiabatic expansion of NHs contained gas to form core aerosol particles from homogeneous condensation from nozzle exits. Aerosol surface reaction rates are a few orders of magnitude higher than that of the gas phase reaction rates. The other mechanism of NOx and SO2 removal is formation of N (P), N (D), H, N2*, NH and NH2 radicals at the exit of nozzle electrode where strong electric field and high density plasma exist for promote oxidation and reduction reactions. In this work, the mechanism of NOx and SO2 convertion to aerosol particles at downstream of reactors, reacting with slip NH3, and core aerosol particles generated by homogeneous condensation and ion induced aerosol formations will be investigated in detail [2]. Experiments were conducted for the flue gas rate from 3 to 12 Nm3/h, the NH3 to acid gas molecule ratio from 0.5 to 1.5, applied voltage from 0 to 27 kV and SO 2 initial concentration from 500 to 1000 ppm. The results show that SO2 removal efficiency increases with increasing ammonia radical injection rate and in-put electrical power. We observed slip NH3 increases with increasing mole ratio and decreases with increasing applied voltage. However, SO2 removal efficiency decreases with increasing mole ratio without discharge. Also, results show that the formation of aerosol particles as well as the particle size distribution depends on applied voltage and initial concentration of SO2.
机译:[[摘要]]研究了用于处理NOx和SO2的电晕放电自由基注入系统,该系统显着提高了去除效率,能源效率,副产物收率等。在电晕放电自由基注入技术中,会产生电晕放电在注入氨,碳氢化合物,蒸汽,氧气,氮气等的空心电极前,因此,我们可以选择污染气体处理所需的自由基,并最大程度地减少不需要的烟道气组分的活化[1]。电晕自由基喷淋系统的机制之一是NHs的绝热膨胀,使气体从喷嘴出口的均匀凝结形成核心气溶胶颗粒。气溶胶表面反应速率比气相反应速率高几个数量级。去除NOx和SO2的另一种机理是在喷嘴电极出口处形成N(P),N(D),H,N2 *,NH和NH2自由基,其中存在强电场和高密度等离子体以促进氧化和还原反应。在这项工作中,将详细研究在反应器下游将NOx和SO2转化为气溶胶颗粒,与滑脱NH3反应以及由均相冷凝和离子诱导的气溶胶形成而产生的核心气溶胶颗粒的机理[2]。进行了烟气速率为3至12 Nm3 / h,NH3与酸性气体分子比为0.5至1.5,施加电压为0至27 kV和SO 2初始浓度为500至1000 ppm的实验。结果表明,SO 2去除效率随着氨自由基注入速率和输入电功率的增加而增加。我们观察到,NH3滑移率随摩尔比的增加而增加,而随施加电压的增加而减少。然而,SO 2的去除效率随着摩尔比的增加而降低而没有排放。而且,结果表明,气溶胶颗粒的形成以及粒度分布取决于施加的电压和SO2的初始浓度。

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