Numerical Study on the Intensification of 3D Fluidized Bed Flue Gas Desulfurization Process by Multi-Jet Structure

Abstract

There are problems such as short residence time, high particle packing density, and insufficient interphase contact in traditional fluidized beds (FBs), which greatly reduce the efficiency of the reactor. Based on this issue, this article simulates and analyzes the flow field characteristics in a 3D FB with different inlet angles (45°, 90°, 102.5°). The results show that in an FB with an inlet angle of 90°, the radial distribution of particles is uniform, and the best interphase mixing effect is achieved. On the basis of the traditional FB, a 3D multi-jet FB (MJFB) structure was designed to study the semi-dry flue gas desulfurization process. The results show that the multi-jet structure enhances the turbulence of gas and the radial pulsation of gas–liquid–solid three-phase, improving the phenomenon of uneven radial distribution of solid particles. In addition, the heat transfer coefficient between the phases has been improved. Compared with FB, the moisture content of MJFB outlet flue gas increased by 33.69 %, and the multi-jet structure reduced the sulfur content of outlet flue gas, which helps to improve desulfurization efficiency.