HTFS+中计算热虹吸的问题？ 回复 1# zhucf using tasc+ to design a thermosiphon reboiler is not difficult, but requires a sequence of calculations. first use design mode to design an exchanger with a specified duty. assume you know, or can estimate, how far the cold stream inlet to the exchanger should be below the liquid surface in the column. convert this height to a pressure head. set the cold stream inlet pressure to the column pressure plus this head. set the permitted cold stream pressure drop to 70% or 80% of this head. guess a cold stream exit quality ? say 0.2, and run tasc+ in design mode. if you are designing a vertical thermosiphon reboiler, set the both the minimum and maximum tube length to the value required to feed flow back to the column at an appropriate height. after the design mode run, use the 慤pdate file with geoemetry ? tasc? facility (under the run menu) to set up a checking case. select the checking case file, and change calculation type to thermosiphon. specify proposed details of the inlet and outlet pipework, and of relative heights. set the pressure in the column. run the thermosiphon mode calculation (with find flow) and look at the heat load achieved. then increase or decrease the exchanger area, and re-run tasc+ in thermosiphon mode until the predicted heat load has the required value for a vertical thermosiphon reboiler, simply increase or decrease the shell inside diameter to modify the exchanger area. it is best to leave the number of tubes unset, so that tasc+ determines an appropriate number of tubes to fill the shell. for a horizontal reboiler, you can modify the shell inside diameter or the tube length. while doing the thermosiphon calculations, you should check the frictional pressure losses in the inlet and outlet pipework, and re-size this pipework if appropriate. after these changes to the exchanger size, you should check that all the constraints are still met, in particular the hot stream pressure drop. if necessary, begin again with a design calculation using a better estimate of the cold stream exit quality and frictional pressure loss, to give a better starting point for the thermosiphon calculations.查看更多
“次氯酸 钠产量大的原因探析与解决办法”如何翻译？ 次氯酸 钠产量大的原因探析与解决办法 root cause analysis and resolutions for high production of sodium hypochlorite 1. 论文标题字母最好要大写 2. 原因探析root cause analysis 3. 解决办法resolutions查看更多
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