Case Study: Active Vapor Distributor In The DWC
2. Structure of Active Vapor Distributor in the DWC Currently, a proper vapor split in the DWC operation is a major design challenge for the engineer. As the solution, the proposed active vapor distributor (AVD) is expected to be able to control the vapor split ratio actively. Figure 3 showed the 3D drawing of the proposed active vapor distributor. It consists of several caps (the number of caps is flexible according to the design) with windows vapor channels inside and two valves for the liquid level controller. The caps are used to circumvent the liquid flowing into the vapor tubes. As visualize in Figure 4, the vapor is leaving the cap through the window, and the vapor flow is controlled by adjusting the liquid level in each section. The chimney tray and the column wall act to collect liquid flowing from the top section. To adjust the liquid level, liquid flow from the chimney tray is sent off to the bottom section through the control valve which similar to the conventional distillation column used. Through this manner, the vapor split ratio control can be accomplished intentionally …show more content…
With an increasing liquid flow rate of the B section, the resistance of the vapor flow decreased in that section, too. With the fixed open area (no liquid level change) as shown in Figure 7 (ii), vapor flow rate to each section of DWC could not be adjusted and only dependent on the liquid split ratio from the top section of the divided-wall. It usually occurs during the operation of DWC, when the liquid load increase in the main fractionation section, the liquid load in the prefractionation section is decreased because the total reflux remains the same. Since the vapor split is unchanged due to the fixed open area, vapor split ratio responses in the opposite way to the liquid split ratio changed. It will result in the unfavorable efficiency loss during the operation of
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