STEEL INDUSTRY

[Welchita]

Hello There!

In an undustrial environment,when you have a lots of heat, which are the best and the more efficient ways/modes for getting out quite enormous quantities of heat ?

Welch

 

[Pressed]

In the last few years I have seen some heat treaters take to new builings with large opening vents in the walls. One place had one entire end of the builing as a vent, it also had a low ceiling which kept in the heat. So, a tall ceiling might help.

If you had the money, one could make an entire building a vent with fans in the appropriate places. But I think it cheaper to erect posts and one flat roof on an angle, no walls.

I am just guessing now. Do you have more details?

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[corus]

Open the window

corus

 

[BigInch]

Don't get rid of it! Use it, store it, recycle it, turn it into electricity, grow tomatos.

 

[Welchita]

And what shall I do with the hudge quantities of those grown tomatos? Another Pamplona scenery and invite a lots of tourists?....

Can you imagine how much heat is radiating (surface temperature at 900 ºC (1652 ºF) from a 16 yards bilets cooling table, file simutaneous lanes: 16 x 30 x 5 kW = 2400 kW That's the heat power I need to get out of the warehouse.

welch

 

[MintJulep]

"Best" and "most efficient" are not necessarilly the same, and neither may be particularly good for your product.

The "most efficient" way is to do nothing at all. Since this requires no work input the efficiency is 100%.

The "best" way is probably to spray water on it.

Now, if you want some other options, how about some more info:

How often are you putting your 2400 kW heat load into the warehouse?

How often do you take whatever it is out of the warehouse, and what is the temperature of the whatever when it leaves? Or, what temperature would you like it to be?

What is the maximum allowable temperature in the warehouse?

What is the temperature of the available ambient air (to see if simple ventilation is a viable option)?

What is the maximum permissible cooling rate of the product?

Do you have a use for the heat?

 

[BigInch]

Sorry. I was being flip. But I do hate to see good heat go to waste. I've had to build a very large tomato house next to a combined cycle power turbine, so some guys could make electricity at the highest possible efficiency and still have something to do with the waste heat, so.... hey why not? When the oil runs out, you'll wish you did it now.

 

[Welchita]

To MintJulep!
Q1: All the time. That's an industry 24/24h with some breaks (during electricity high rates periods).

To the rest of all other questions:
That's a process requirement: I have to cool the steel bilets down to 500 ºC at a certain rate in order the material of those bars (steel) regain the magnetic properties again.

The present situation is that it takes to long. So I have to increase the cooling slope at the level of the cooling-table.

The warehouse does not have already two walls, completely free-open those two sides.

My recommendation is to consider as well a big a longitudinal opening vent at the level of ceiling.
We are looking at the ceiling structure to evaluate that possibility. But this is what we call passive measures. And about active measures? That's my question!

We thinking about strong ventilation below table combined with a 90ºsmall water-jets distribution.
At this stage, we begin to face materials properties problems, because of radiation levels we are facing and the consequent surface temperatures.

Can be 28 to 32 ºC, at the maximum load.
Cooling rate: suppose 5 + 5 bilets each 1500 kg the first 5 at 750 ~ 900 ºC and the second 5 at 600 ~ 750 ºC.

I have to confirm the amount of time to impose at this cooling phase in order to define the nominal cooling rate. I 'm waiting this data from the process engineer.

Concerning the extra-heat issue: I mentioned already to manager a possibility to design a production hot-water central to supply the village nearby, that involves some administration serious issues. Some of this kind of projects are already implemented in the scandinavian countries. In studying. Otherwise, no chances.

To BigInch

That's ok! In principle I agree with you.

Thanks to both.
welch

 

[Welchita]

To BigInch, again!

In this case I would wish you as a neighbour. You didn't need at all the combined cycle power turbine! ....

Kind regards,
Welch

 

[BigInch]

Actually it was the tomato house that I didn't need, but we had to get really inovative that time. Need any tomatos? Sounds like you could dry them pretty easily. I could repackage them in olive oil and sell them here. Oops... there I go again.