300MW燃煤电站湿法脱硫仿真装置研究

Study on Simulation Equipment of Coal-fired 300MW Power Plant Flue Gas Desulfurization System

湿法脱硫仿真系统在脱硫优化运行和人员培训上有着重要的作用,基于虚拟DPU技术和模块化建模技术建立了湿法脱硫仿真装置。吸收塔是整个脱硫系统的核心部件,影响其脱硫效率的因素众多,动态特性非常复杂,是整个仿真系统建模的重点和难点。以某300MW燃煤电站湿法脱硫吸收塔为仿真对象,在系统机理研究的基础上,建立了吸收塔数学模型,主要包括:石灰石溶解模型、浆液雾化模型、气液传质模型、离子反应模型等。采用模块化的建模方式,分别建立了各种子模块,并依据实际的系统流程将这些子模块耦合在一起模拟吸收塔的整个工作流程。选取了烟气含硫量和烟气质量流量变化对吸收塔脱硫效率和PH值的影响进行了仿真计算,仿真结果与实际系统的动态特性相符,进一步验证了数学模型的正确性。

The whole range simulator of wet flue gas desulfurization （FGD） is very important in optimizing operation and staff training. Based on virtual DPU technology and modular software technology, a wet FGD simulator was established. The absorption tower is a core part of the FGD system, what with the influence factors of desulfurization efficiency is numerous and the dynamic characteristic is complicated. The model of absorption tower is the emphasis and difficulty in whole modeling of simulator. With a desulfurization absorption tower of coal-fired 300MW power plant for the simulation object, based on the study of mechanism, an absorption tower model was built. The model included the limestone dissolving model, atomization model, gas-liquid mass transfer model and ionic reaction model. A series of sub-model were established using the modularized modeling method and were coupled according to practical system. The model was applied to investigate the effects of sulphur content and gas mass flow on desulfurization efficiency and PH value. The result predicts and measures dynamic characteristics compared well, which is a further proof of the accuracy of the model.