不同供电模式下电除尘器协同脱除燃煤烟气中多种污染物的机制研究

The PM2.5, SO2, NOx, mercury(Hg) and other pollutants generated by coal-fired have exacerbated by environmental pollution and destruction of ecosystems. Currently the research on pollutants in coal-fired flue gas is mainly for the separate removal of the pollutant, energy consumption and operation cost is higher. Pollution control has intensified with the promulgation of a new air pollutant emission standard for thermal power plants (GB 13223-2011).We propose a new model that the collection efficiency of PM2.5 will be improved by electrostatic precipitator (ESP) in different power supply modes, SO2, NOx and Hg will be removed auxiliary. Research the influence mechanism of power supply modes, flue gas temperature, humidity and flue gas composition on the generation of plasma in corona discharge process at ESP laboratory bench; the reaction kinetics of low temperature plasma alone removal PM2.5, SO2, NOx and mercury pollutants from flue gas in different power supply modes and flue gas conditions; the interactions and transformation mechanism of flue gas pollutants. On the above basis, this study reveals the collaborative removal mechanism of multi-pollutant in flue gas and set up chemical thermodynamics equation and the reaction kinetics model of pollutants removal at the same time. Based on multi-disciplinary theory, this subject presented a new method of simultaneous removal multi-pollutants in flue gas based on the different ESP power supply modes and integrating the existing technology, providing theoretical and technical support to dramatically reduce emissions of PM2.5 and other pollutants in flue gas.

燃煤所产生的PM2.5、SO2、NOx及汞等污染物已经严重加剧了环境污染及对生态系统的破坏。目前对燃煤烟气污染物的研究主要为污染物的单一去除，能耗及运行成本较高，且很难达到新的排放标准。本课题提出利用电除尘器在不同供电模式下提高PM2.5脱除效率的同时，辅助脱除SO2、NOx及汞等多种污染物的新技术。在电除尘器实验台上探讨供电模式及烟气条件对电晕放电过程中等离子体产生的影响机理；不同供电模式及烟气条件下，低温等离子体单独脱除PM2.5、SO2、NOx及汞等污染物的反应动力学；燃煤烟气中多种烟气污染物的相互作用和转化机制。在上述基础上，揭示出燃煤烟气中多种污染物协同脱除的机理、建立多种污染物协同脱除的化学反应动力学模型。课题以多学科理论为基础，提出基于不同供电模式下电除尘器协同脱除燃煤烟气中多污染物的新方法，并与现有各污染物控制技术集成，为实现燃煤烟气污染物的达标排放提供理论依据和技术支持。

目前对燃煤烟气污染物的研究主要为污染物的单一去除，能耗及运行成本较高。本课题提出了利用电除尘器电源在不同供电模式下同时脱除燃煤烟气中多污染物的新模式。本课题研究了不同供电模式及烟气条件下，低温等离子体单独脱除PM2.5、SO2、NOx等污染物的反应动力学、燃煤烟气中PM2.5与SO2、SO2与NOx等烟气污染物的相互作用和转化的机制，初步揭示出燃煤烟气中多种污染物协同脱除的机理。课题以多学科理论为基础，提出了基于电除尘器不同供电模式下同时脱除燃煤烟气中多污染物的新方法，为大幅降低燃煤烟气中PM2.5及其它烟气污染物的排放提供理论及技术支持。