EDR calculation for thermal siphon reboilers

For vertical thermosyphon reboilers with side discharge, the distance between the discharge nozzle and the tube sheet is generally preferably in the range of 20 mm to 50 mm. Setting this distance in EDR can be adjusted through two pages. First, on the nozzle page, you can set the distance to tubesheet parameter to adjust the distance between the discharge nozzle and the tube sheet. Secondly, on the Thermosiphon Piping page, you can set relevant parameters such as the boiling zone height and the upper boiling zone height. Regarding the issue where the dimensions of the reboiler sketch generated do not match the values you set, there could be several reasons: 1. It is possible that you did not click the “Apply” or “OK” button to confirm the changes when setting the distance to tubesheet parameter. 2. It is possible that the settings of other relevant parameters interact with the \"distance to tubesheet\" parameter, resulting in the final dimensions not being adjusted as you intended. You can check whether the settings of other relevant parameters are correct. 3. It may be a bug in the software itself that prevents the correct display of dimensions. You can try restarting the software or updating it to the latest version to resolve this issue. If the above methods still cannot resolve the issue, it is recommended that you contact the technical support team of the EDR software for assistance. .

Hello, teacher! The distance between the discharge nozzle and the tube sheet that I’m referring to is the vertical distance DE in the diagram above. You mentioned that this distance is generally preferably between 20 mm and 50 mm. Where does this figure come from? Generally, the liquid level in the tower bottom is at the same level as the tube sheet. However, taking operational flexibility into account, the liquid level in the tower bottom might be higher than that of the tube sheet. Is this distance of 20 mm to 50 mm too small? Slight fluctuations in the liquid level in the tower bottom could potentially cause the outlet nozzles of the reboiler to be submerged. For the vertical thermosiphon reboiler I am currently designing, which features side discharge, I plan to set the distance between the discharge nozzle and the tube sheet at 600 mm. When the value set for the distance to tubesheet is below 300 mm, EDR gives a warning indicating a conflict with the parameters set in Thermosiphon Piping; however, no such warning appears when the value is above 300 mm. However, whether the parameter is set to 600 mm, 1600 mm, or 2600 mm, the calculation results remain the same, which is clearly unreasonable. Could you please tell me what might be causing this? The issue of the exported reboiler schematic not being drawn at the set values has been resolved by switching to a newer version of EDR.

Hello, teacher! The distance between the discharge nozzle and the tube sheet that I’m referring to is the vertical distance DE in the diagram above. You mentioned that this distance is generally preferably between 20 mm and 50 mm. Where does this figure come from? Generally, the liquid level in the tower bottom is at the same level as the tube sheet. However, taking operational flexibility into account, the liquid level in the tower bottom might be higher than that of the tube sheet. Is this distance of 20 mm to 50 mm too small? Slight fluctuations in the liquid level in the tower bottom could potentially cause the outlet nozzles of the reboiler to be submerged. For the vertical thermosiphon reboiler I am currently designing, which features side discharge, I plan to set the distance between the discharge nozzle and the tube sheet at 600 mm. When the value set for the distance to tubesheet is below 300 mm, EDR gives a warning indicating a conflict with the parameters set in Thermosiphon Piping; however, no such warning appears when the value is above 300 mm. However, whether the parameter is set to 600 mm, 1600 mm, or 2600 mm, the calculation results remain the same, which is clearly unreasonable. Could you please tell me what might be causing this? The issue of the exported reboiler schematic not being drawn at the set values has been resolved by switching to a newer version of EDR.