燃煤电厂白色烟羽的潜值和控制策略评价

Evaluation of potential and control strategy of white plume in the coal-fired power plants

随着多地政府出台政策,燃煤电厂白色烟羽的控制引发广泛关注。为评价白色烟羽控制的影响,本文建立了潜值计算模型,对2017年上海市和天津市白色烟羽的消除效果进行了研究,结果表明烟气冷凝、烟气加热、烟气冷凝再热均无法完全消除白色烟羽,特别是在冬季和北方城市(天津市)控制效果较差。以某燃煤电厂为例,对模型的应用效果进行了验证,结果表明潜值模型用于白色烟羽的评价具有一定的适用性,但气象数据测量误差会在一定程度上影响评价的精确度。此外,对白色烟羽控制对脱硫系统、烟气焓值和环境影响进行了研究,表明白色烟羽控制会改变脱硫系统的水平衡、影响燃煤电厂能耗且对环境造成一定的消极影响,因此目前燃煤电厂白色烟羽控制不具有推广性。

The white plume in coal-fired plants has been received more and more attention as several provinces or cities enact statute to control it. In this paper, mathematical model of plume potential was developed to evaluate the white plume control of Shanghai City and Tianjin City. The results showed that white plume cannot be eliminated all period in a year, especially in winter and North China such as Tianjin City. Meanwhile, the evaluation of potential model has been developed indicating that strength of white plume can be quantified by potential value in some way. However, the accuracy of potential can be affected by meteorological data which should be improved in the future. Moreover, the control of white plume has negative impact on flue gas desulphurization (FGD) water balance, energy consumption and environmental quality, which cannot be developed by government before environmental impact assessment.