Abstract
The deflector and the rod bank are commonly used to optimize flue gas distribution in the original spray tower (OST) of a wet flue gas desulfurization system (WFGD). In this paper, the internal optimization mechanism of the deflector desulfurization spray tower (DST) and the rod bank desulfurization spray tower (RBST) are studied. Based on the Euler–Lagrange method, the standard k-ε turbulence model, an SO2 absorption model and a porous media model, the numerical simulation of the desulfurization spray tower is carried out with the verification of the model rationality. The results show that there are gas-liquid contact intensification effects in DST and RBST. Compared with OST, gas-liquid contact intensification enhances the heat and mass transfer effects of DST and RBST. The temperature difference between inlet and outlet of flue gas increased by 3.3 K and the desulfurization efficiency of DST increased by 1.8%; the pressure drop decreased by 37 Pa. In RBST, the temperature difference between the flue gas inlet and outlet increased by 5.3 K and the desulfurization efficiency increased by 3.6%; the pressure drop increased by 33 Pa.
Highlights
Wet flue gas desulfurization (WFGD) is used to treat most of the flue gas produced by the power and heat production and supply industries in China [1]
The results show that the errors of temperature difference, pressure difference and desulfurization efficiency are all less than 10%, proving the feasibility and effectiveness of the simulation
The Euler–Lagrange method, the standard k-ε turbulence model, the SO2 absorption model and porous media model based on the two-film theory are applied to simulate the gas-liquid two-phase flow with the consideration of heat and mass transfer between phases for desulfurization spray tower (DST), rod bank desulfurization spray tower (RBST) and original spray tower (OST)
Summary
Wet flue gas desulfurization (WFGD) is used to treat most of the flue gas produced by the power and heat production and supply industries in China [1]. Through the countercurrent contact between acidic flue gas and alkaline slurry, the acidic gas is absorbed by the slurry, achieving the purpose of removing sulfur dioxide [2,3]. The operating cost of WFGD is mainly composed of electricity consumption, alkali consumption, water consumption, labor cost and equipment maintenance. The desulfurization efficiency can be effectively improved by increasing the amount of slurry circulation, but the amount of power required by the slurry circulation pump is greatly increased, increasing the electricity consumption. The increase in the operating resistance of the desulfurization spray tower will cause the induced draft fan to use more power, so the electricity consumption will increase. Since the desulfurization spray tower is the main equipment of WFGD [4], the operating parameters, structure design and hydrodynamic performance analysis of the desulfurization spray tower are important
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