7 replies to this topic

[Lyne]

Hello everyone,

 

i want to know what are the scenarios that could result in adsorption beds uprising or crushing and collapsing ?

 

I have a scenario of reverse flow with 85 barg to a mercury removal bed operating @ 70-78 barg, what are the damages that could result from this differential pressure ? also the flow reverse is a three phase flow which is diffrent from the feed inlet to the bed. 

 

Attached is the mercury bed, the reverse flow will be from the bed's outlet to the inlet.

 

Thank you for the help.

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[breizh]

Hi,

For people interested, a description of the chemistry to remove Hg using Alumina.

https://blog.axens.n...ted-natural-gas

 

My understanding is that the bed is saturated and solid should be removed and replaced with fresh one. This is managed through delta P measurement.

 

You may want to contact this company for support.

Breizh

[Lyne]

Thanks for sharing,

The problem is that there's a new facility that will be installed downstream the bed which can lead to a reverse flow to the mercury bed. The hazop chairman recommended installing a check valve or studying the severity of reverse flow on the adsorption bed.

[breizh]

Hi,

I've no expertise on your process, I'm just worried about the grid, support of the bed, they will be damaged, and you may have solid in the lines. 

https://amacs.com/we...upport-grids-2/

Probably a good idea to install a Check valve or 2 in series!

Waiting feedback from others.

Breizh 

[Pilesar]

Support grids (and distillation trays) are not designed for a large upward force by default. The bed support is pieced together in sections. A large upflow might raise up a section just a bit and not return to its intended position allowing the bed contents to fall through. In addition to the bed support concerns, all pressure relief valves in the system should be re-evaluated for new scenarios.

[Lyne]

Is there Any book or reference about support grids I can use ? 

[Pilesar]

I suggest going first to the company who supplied your existing support plate as they have the best information on their equipment limitations. Bed supports come in different designs and specifications. One example is https://koch-glitsch...g-support-plate

[Bobby Strain]

Backflow would create a mess! Best to prevent it. Use two different types of check valves.

 

Bobby