Structure and function of the tray in the CO2 stripping hydrolysis tower
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In the 300,000-ton urea plant designed by the Fourth Chemical Engineering Institute, the trays in the hydrolysis tower are sieve trays; yet why are feed pipes also provided on these trays? What is the reason for this (other than ensuring smooth liquid flow)? What are the advantages of this design? This post was last edited by ymtuegj12 on 2009-1-5 11:33.]
This post was last edited by 1025199692 on 2010-1-27 at 18:23 to artificially disrupt the flow of the liquid and increase its residence time in the hydrolysis tower
1. It enables better maintenance of the liquid level on the tray, thereby increasing the residence time. 2. Patent issues, setting it apart from other design manufacturers
This post was last edited by 1025199692 on 2010-1-27 at 18:22. The liquid outlet nozzles can be divided into two types: those with a liquid seal groove and those without one. Those with a liquid seal groove serve two purposes: firstly, to prevent liquid from overflowing; secondly, to prevent air from entering. Additionally, they help ensure that the liquid stays within the tower for an appropriate duration, and also prevent the liquid from taking a short circuit. If there is no liquid seal groove, only items 1, 2, and 4 apply.
Is the author referring to the arc-shaped liquid drop pipes, or the pipes with a diameter of around 16 mm distributed on the sieve plate? If it’s the former, then that’s normal; but if it’s the latter, they aren’t liquid drop pipes – they are lift pipes. This post was last edited by lxq700918 on 2009-1-27 11:39.]
The last edit to this post was made by 1025199692 on 2010-1-27 at 18:25. The trays in hydrolysis towers are generally designed in a sieve-like format, while the trays in CO2 stripping towers have 21 layers. Trays serve two functions: one is to reduce liquid backmixing, and the other is to perform distillation, thereby transferring ammonia from the liquid phase to the gas phase and accelerating the hydrolysis of urea.
I mean, just post a picture and it will be clear, right?