oil flow rate??

[MilanMhatre]

We have thermic fluid heater of 1,00,000 kcal/hr capacity. Which is use for batch reactor to rise temperature.
when reaction is over at temp 230C then heated oil start flowing through HE which cool down reduce oil temp upto 70C.

from above case i have to ask " Flow rate of oil pump and flow rate of oil which coming out of reactor is same " ??

What is the oil flow rate ... ??
or how much cooling water required to achieve 70C temp??

Data-

3 H.P pump
0.75" dia of outlet pipe
15m Head
at temp 230C

 

[Latexman]

Also, describe the heat transfer method on/in the reactor. Diameter, coil, half-pipe jacket, strap-on jacket, dimple jacket, what? How much heat transfer area? Nozzle size(s) for oil?

Describe the hot oil heater. Inlet/outlet nozzle size?

What size nozzles on oil pump inlet and outlet? Is the oil pump a centrifugal?

Describe your RX agitator. Type, RPM, impeller type, number of impellers, diameter, motor power. In-process viscosity of the reactor mix at various stages/temperatures?

Good luck,
Latexman

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[Latexman]

Also, "slow" heat-up and cooldown on hot oil systems are not always a bad thing! That minimizes thermal expansion and stress issues. It minimizes fatigue failures, oil leaks, and fires. So, if productivity is increased, BEWARE!

Good luck,
Latexman

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[MatthewL]

Milan,

Also watch out for tube or sheet failures in the heat exchanger! If you increase your oil flowrate through the HX without increasing the water flow rate, localized boiling can easily occur, leading to oil in your cooling tower (or water in your oil), which you definitely do not want to happen. Huge disposal and cleaning costs in the first case, good chance of oil heater/pump failure when the water in the hot oil flashes off in the second. I have seen air coolers (looks like a large automobile radiator on it's side) used successfully with hot oil in a previous job, we would use them to cool 2200 US gallon reactors (about 7 ton of product) from 250 C to 135 C, it would take ~1-2 hours, and you don't have to worry about leaking material from one system to another. Also, ditto to what Latexman wrote about heating and cooling stress on piping. If you do increase cooldown rates, expect more frequent failures, especially if you use a half-pipe or dimple jacket.

Matt

Quality, quantity, cost. Pick two.

 

[Latexman]

All the questions asked above are trying to get at, what is the biggest bottleneck to cooling? Or, what is the minimum change needed to get the desired improvement? One can easily list things to do to get faster cooldown, such as (not in any particular order):
[ul]
[li]Increase oil flow (larger piping, bigger pump impeller, higher RPM, bigger motor, bigger pump, etc.)[/li]
[li]Use countercurrent flow instead of cocurrent flow on exchanger[/li]
[li]Bigger heat exchanger[/li]
[li]Increase RX agitation[/li]
[li]Add more heat transfer area to RX[/li]
[li]Increase cooling water flow[/li]
[li]Larger cooling towers[/li]
[li]Use chilled water[/li]
[li]Etc. (I'm sure there are others)[/li]
[/ul]
With limited instrumentation and equipment documentation, it will be a struggle to find the optimal solution. In fact, without good data and documentation, it is an educated/experienced guess. Hopefully, you can answer some of the outstanding questions and we can see what that points to.

Good luck,
Latexman

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[MilanMhatre]

Thanx all of you... if i got better solution in above mentioned case then sure ll revert back....