燃煤机组环保设施烟风系统节能提效分析研究

Analysis and research on energy saving and efficiency improvement of flue gas system in environmental protection facilities of coal-fired units

在“双碳”目标背景下,燃煤机组“降碳”的核心是机组节能降耗。对于环保系统来说,通过烟道流场优化,降低机组运行阻力和风机能耗是实现节能降耗的有效途径之一。为深度挖掘环保系统节能降耗潜力,采用数值模拟技术对某电厂2台350 MW燃煤汽轮发电机组脱硫、湿除以及连接烟道进行了全面建模、流场模拟和数值分析,并基于烟道内烟气流线分布、速度分布等参数的对比分析,判断环保系统阻力的分布,获得不同烟道结构及采用不同导流装置工况下的降阻效果,计算对应的风机能耗及节能效果。结果表明,通过脱硫、湿除连接烟道的优化改造,预计降阻83.38 Pa,每年节约引风机能耗约33.32万kW∙h,节约费用约14.15万元。本文所述烟道降低阻力方法对相似燃煤机组的烟气系统节能降耗提效改造具有重要的指导意义。

Under the background of'carbon peak and carbon neutralization'target,the core of'carbon reduction'of coal-fired units is energy saving and consumption reduction of units.For the environmental protection system,reducing the operating resistance of the unit and the energy consumption of the fan through the optimization of the flue flow field is one of the effective ways to achieve energy saving and consumption reduction.In order to deeply tap the potential of energy saving and consumption reduction of environmental protection system,numerical simulation technology was used to conduct comprehensive modeling,flow field simulation and numerical analysis on desulfurization,wet removal and connecting flue of two 350 MW coal-fired turbo-generator units in a power plant.Based on the comparative analysis of parameters such as flue gas streamline distribution and velocity distribution in the flue,the distribution of resistance of environmental protection system was judged,the drag reduction effect under different flue structure and different diversion device conditions was obtained,and the corresponding fan energy consumption and energy saving effect were calculated.The results show that through the optimization and transformation of the desulfurization and wet removal connecting flue,it is expected to reduce the resistance by 83.38 Pa,save the energy consumption of the induced draft fan by about 33.32 million kW·h per year,and save the cost by about 141.5 thousand yuan.The method of reducing the resistance of the flue described in this paper has important guiding significance for the energy saving and efficiency improvement of the flue gas system of similar coal-fired units.