type chemical reactor jacket

[charls1]

Dear all,
As far i knew, there are 5 type of reactor jacket:
1. Conventional jackets
2. Half pipe coil jackets or split coil jacket
3. Dimple jackets
4. Constant flux cooling jacket
5. Internal coil

What are the strong & weakness of chemical reactor jackets from above, which one is better in terms of usage for steam & cooling and more efficient in terms of flow & volume for steam & cooling?

thanks for your advice

Charls

 

[LittleInch]

All depends on your process conditions. Efficiency is a very vague term.

Remember - More details = better answers
Also: If you get a response it's polite to respond to it.

 

[pierreick]

Hi,
Not enough information to get a proper answer!
No information about the reagents, the process conditions, continuous or batch process, what is the final product (solution, crystals, slurry), ETC.
You need to consult your process engineer, preferably a chemical engineer, or hire a CHE contractor to support your project.
May be an external HX will do a better job?
Good luck.
my 2 cents
Pierre

 

[MJCronin]

Homework question, Charles ?????

MJCronin
Sr. Process Engineer

 

[LittleInch]

Each has its benefits depending on the process requirements. E.g, is it gas, liquid or some mixture of the two. How much heat is to be transferred.

There is no real "efficency" here.

But you've asked a lot of questions and only responded to half of them....

Remember - More details = better answers
Also: If you get a response it's polite to respond to it.

 

[charls1]

@pierreick, @MJCronin, @LittleInch thanks a lot.
Our existing cooling tank (conventional) having problem with cooling time for batch process (slurry product)
And we will change into conventional with 2 inch inlet/outlet (bigger then existing) or we have to change into Half pipe coil jacket to get better cooling time. Others cooking tank that we have was made from half pipe coil and we got good cooking time.

Thanks
charls

 

[r6155]

Others cooking tank that we have was made from half pipe coil and we got good cooking time.

So why do you have the question?

Regards

 

[charls1]

@r6155, Need others second opinion about the issue.

thanks

 

[pierreick]

Hi,
The problem may come from heat transfer coefficient (see doc attached). You said the other reactors are working fine, check the difference between the other reactors and the one you want to change the half pipe coil. I do believe the problem is coming from your reactor (mixing, design parameters, operation parameters), except if the half pipe coil is dirty.
Pierre

 

[pierreick]

Hi,
Another document to support your work.
Pierre

 

[Latexman]

My BU has mostly installed half-pipe jackets on RXs and cooling tanks since 1980. Before that it was dimple jackets, but performance on those was not that good when new, and, as they age, they tended to foul and plug in a way that could not be fully recovered with acid washes. We did install a few conventional jackets in Asia back in the 1980s. The half-pipe jacket has better performance and uses less water than conventional.

What is your process temperature profile in a batch?

Good Luck,
Latexman

 

[charls1]

@pierreick, thanks for your advice bro.

@Latexman, our process temp is to cooling down initial 90oC into 50oC in optimum time.

 

[Latexman]

That’s pretty easy on the equipment from a thermal stress standpoint. On half-pipe, be sure the pipe to shell weld is a full penetration weld during the fabrication. If not, leaks and repairs are in your future.

Good Luck,
Latexman

 

[pierreick]

Hi,
To add to the discussion:

https://www.linkedin.com/pulse/advantages-half-pipe-reactors-high-pressure-service-jon-ward

https://chemicalengineeringworld.com/types-of-jackets-for-reaction-vessel/

Note: multiple inlets/outlets will improve the heat transfer, using half coil.
Pierre

 

[LittleInch]

charls,

In theory, the conventional jacket should be better as there is a larger surface area to transfer heat from internal to external.
For the same cooling water flow and inlet temp.

However the conventional jackets can have issues with mixing / turbulence of the cooling water and the heat transfer coefficient may be smaller Depending o hwere the nozzles are and direction of flow etc, there could be some short circuiting of the cooling flow as well. Also half pipes you can have two or more circuits so there is a greater area where there is a higher delta T.

Is this a vertical vessel or horizontal?

Cooling and comparisons between vessels also need to consider the internal flow, turbulence and residence time so there is no guarantee that the difference between the vessels is solely down to the type of cooling system.

The devil is in the detail, none of which you have supplied.

Remember - More details = better answers
Also: If you get a response it's polite to respond to it.

 

[charls1]

@LittleInch
it is vertical vessel

charls

 

[LittleInch]

Is this a tank or a PV?

But either way, you're not going to find any answers here and you've provided no data.

Half pipe has some advantages, but also some negatives. You or a process engineer need to balance those out. We can't do that for you.

Remember - More details = better answers
Also: If you get a response it's polite to respond to it.

 

[charls1]

@LittleInch, Thanks a lot

 

[pierreick]

Hi,
A conventional jacket is prone to by-pass, unless you add a channel inside to direct the flow. Forget about it!
Pierre