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Analytic study on approach to adiabatic saturation temperature and the control scheme for the amount of water sprayed in the semi-dry FGD process

机译：半干法烟气脱硫工艺绝热饱和温度的分析方法及喷水量控制方案

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In this paper, problems relating to the Approach to Adiabatic Saturation Temperature (AAST) and the semi-dry Flue Gas Desulfurization (FGD) system operation reliability have been studied. The first part of the paper is to clarify some confusion with regard to AAST. The correlations and differences among 'Adiabatic Saturation Temperature (t_(as))', 'Wet Bulb Temperature (t_w)' and 'Dew Point Temperature (t_d)' have been compared and analyzed. A humidity chart has been specially made to describe the humidification process in a semi-dry FGD reactor and to analyze the significance of the parameter, AAST, in details. It can be concluded that the process in the semi-dry FGD reactor is not an ideal adiabatic humidification process, and the parameter of the Approach to Dew Point Temperature instead of the Approach to Wet Bulb Temperature can play a similar important role as AAST in the semi-dry FGD process. The second part of this paper discusses the sensor fouling and corrosion problems during measurement in the present control of the amount of water sprayed. A new control scheme with its modeling mechanism based on the flue gas humidity chart has been developed in this paper. The required control parameter, AAST, can be obtained through a soft sensor method.
机译：本文研究了与绝热饱和温度法（AAST）和半干烟气脱硫（FGD）系统运行可靠性有关的问题。本文的第一部分是要澄清对AAST的一些困惑。比较并分析了“绝热饱和温度（t_（as））”，“湿球温度（t_w）”和“露点温度（t_d）”之间的相关性和差异。专门制作了一张湿度表来描述半干烟气脱硫反应器中的加湿过程，并详细分析了参数AAST的含义。可以得出结论，在半干式烟气脱硫反应器中的过程不是理想的绝热加湿过程，在反应堆中，露点温度法的参数代替湿球温度法的参数可以起到与AAST类似的重要作用。半干烟气脱硫工艺。本文的第二部分讨论了在当前喷水量控制中在测量过程中传感器结垢和腐蚀问题。本文提出了一种基于烟气湿度图的控制机制及其建模机制。所需的控制参数AAST可以通过软传感器方法获得。

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