What level is the tower pressure difference maintained during normal production? What type of tower internals?
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As the title suggests: What level should the tower pressure difference be maintained at during normal production? What type of tower internals? How can tower pressure differences be reduced to achieve high yields during normal production without decreasing system capacity?
This is a bit difficult to answer. Is it tower pressure or the pressure difference? The process varies, as do the types of towers and the production load; therefore, tower pressure can change significantly. As for reducing the pressure difference in order to achieve higher yields, I don’t understand what that means. Our pressure levels are usually around 25.6 MPa
Reply to 2# TH373637: We require a pressure difference in the tower for our internal components
There are definitely requirements regarding the pressure difference in the tower; otherwise, it can cause damage to the internal components, especially those located at the bottom of the tower where heat exchangers are present. As for your method of adjustment, I don’t think it’s very feasible. Abroad, the circulation volume is kept very low, as a high circulation volume can be harmful to the catalysts
Our plant’s synthesis tower is from Kellogg; the pressure difference is less than 400 KPA. It has now been converted to an axial-radial design, with a pressure difference of 310 KPA, an operating load of 85%, and a circulation rate of around 600,000
The pressure difference in our synthesis tower is less than 0.3 MPa; the internal components of the synthesis tower manufactured by Casali in Switzerland feature three catalyst beds and two heat exchangers, with a circulation rate of 400,000
Reply to 3# fyunchem: The pressure difference is too close to the design value; if not managed properly, it could exceed 1.0 MPa, which would cause damage to the components inside the tower. The pressure difference should be reduced further. To increase production, the opening degree of the bypass line should be decreased, but this will lead to an increase in the circulation volume and thus a higher pressure difference again. I think efforts should be made to adjust the hydrogen-to-nitrogen ratio by controlling the gas composition, and adjusting the amount of ammonia fed into the tower should also have an effect.