Flow field optimization method for two-stage serial tower type wet flue gas desulfurization device

Abstract

The invention relates to a flow field optimization method for a two-stage serial tower type wet flue gas desulfurization device. A calculation mode of first unidirectional flow and then multiphase flow is adopted; single-phase flow simulation adopts a system overall simulation mode, and multiphase flow simulation adopts a local segmentation mode; single-module two-phase flow CFD simulation calculation optimization is carried out on trays in a prewashing tower and an absorption tower, the aperture ratio and the aperture size of the trays of the prewashing tower are determined, and the height and resistance information of liquid holding layers in the trays is obtained; and two-phase flow overall simulation calculation optimization is carried out on the flow in the prewashing tower and the absorption tower to obtain a final optimization scheme including flow guide plate arrangement, spraying layer optimization arrangement and tray optimization design in a flue. The method is suitable for optimization calculation of the flow field of the wet desulfurization tower, and is particularly suitable for optimization calculation of the flow field of a two-stage desulfurization tower provided with the trays and a serial tower, the flow characteristic in the desulfurization tower can be accurately obtained, meanwhile, the calculation amount of flow field optimization is greatly reduced, and the calculation time of flow field optimization of the whole desulfurization system is shortened.

Description

technical field [0001] This patent application belongs to the technical field of flue gas desulfurization, and more specifically relates to a method for optimizing the flow field of a two-stage serial tower type flue gas wet desulfurization device. Background technique [0002] Coal is the main primary energy source in my country. Sulfur dioxide is the main air pollutant produced after coal combustion. At present, the pollution of nitrogen oxides in my country is very serious, and corresponding technical solutions are needed to control it. Wet flue gas desulfurization is a large-scale desulfurization method used in the world at present, and it is the most important technical means to control acid rain and sulfur dioxide pollution. [0003] With the increasingly stringent environmental protection standards, the existing single-tower desulfurization devices cannot meet the ultra-low emission standards. When the desulfurization efficiency of a single tower cannot meet the emiss...

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Problems solved by technology

Due to the characteristics of the entire wet desulfurization system, the flue gas is divided into single-phase flow and two-phase flow areas in the system; and CFD flow field simulation has different calculation models for single-phase flow and two-phase flow, and single-phase flow requires less resources , the calculation speed is fast; the simulation calculation of two-phase flow requires a lot of calculation power and calculation time, if the two-stage series towers are calculated at the same time, it may cause insufficient resources to calculate

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