Numerical Simulation of Venturi Device in Flue-Gas Circulating Fluidized Bed Desulphurization Tower

Abstract

Venturi device has important effect on pressure loss and flow field of flue-gas circulating fluidized bed desulphurization tower. Desulfurization tower is huge. Experimental study is difficult and costly. For these problems, PC-SIMPLE algorithm of Euler model of Fluent software is applied and flow condition of four different kinds Venturi tube are simulated in this paper. The pressure loss of curved Venturi is minimum. Three groups of Venturi tube can get uniform velocity field in the tower. Turbulence intensity of a group Venturi tube is maximum, followed by curved Venturi tube. But the turbulence intensity gradient of a group Venturi tube inside the absorber is also the largest. In order to get low pressure loss and better flow field, three groups Venturi tube is optimum.

Study on the Flow Characteristics of Desulfurization Ash Fine Particles in a Circulating Fluidized Bed

“…As shown in Table 1, many scholars have studied the flue gas desulfurization process by experiment or simulation [25][26][27][28][29]. Table 1 shows that research on circulating fluidized bed flue gas desulfurization is mostly focused on improving the adsorbent's adsorbability [30][31][32][33][34][35][36][37], improving the pore structure of the adsorbent [31,[38][39][40], and establishing different desulfurization models [41][42][43] to improve the utilization rate of the desulfurizing agent. Li et al [42] established a mass balance model using fast hydrating adsorbents, and predicted the system status from the aspects of particle wear, particle residence time, particle segregation, and the desulfurization process, and optimized operating conditions.…”

“…Table 1 shows that research on circulating fluidized bed flue gas desulfurization is mostly focused on improving the adsorbent's adsorbability [30][31][32][33][34][35][36][37], improving the pore structure of the adsorbent [31,[38][39][40], and establishing different desulfurization models [41][42][43] to improve the utilization rate of the desulfurizing agent. Li et al [42] established a mass balance model using fast hydrating adsorbents, and predicted the system status from the aspects of particle wear, particle residence time, particle segregation, and the desulfurization process, and optimized operating conditions. Studies indicated that the circulating ash adsorbent has a better desulfurization effect and higher desulfurization efficiency than the fly ash adsorbent, which is beneficial to the mass balance of the circulating fluidized bed desulfurization system.…”