Power generation at EAF steel plant

[haydenle]

I was wondering, is there any way to use the off gases that is vented to generate steam power?

 

[davefitz]

I am not sure of your exact application, but there are 2 common choices:
a) off gases are not combustible bu are hot ( > 500 F)==> use a heat recovery steam generator or recuperative air heater
b)off gases are combustible- blast furnace gas combustor with boiler used to be fairly common 30 yrs ago.

 

[MJCronin]

wayne....

You are not the first to consider an EAF waste heat boiler here...

However, you must keep in mind that with regard to the list of nasty,corrosive, dust and ash laden gas streams; this is one of the worst.

In engineering, it always comes down to costs..


-MJC

 

[rmw]

Your temperatures of the mixed gases are not high enough to generate steam at the pressures and temperaures needed for practical turbine operation. If, on the other hand you had some use for low grade steam, then you might want to evaluate overcoming the obstacles mentioned by MJCronin. And he is right about what he said. Nasty stuff.

rmw

 

[haydenle]

Thanks for the response guys. Your input has been very helpful. I just figured, you shouldnt let all that heat go to waste.

 

[EdStainless]

Use the heat to dry and preheat charge material.
Little chance for power though.
The low grade steam option would work if you needed it.

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[tmoritz]

If the vented gas is coming from a combustion process you may want to use the waste heat to preheat your incoming combustion air. You would need an air to air heat exchanger. You would then save the fuel required to heat your combustion air from ambient to process temperature.

Possible negatives, you might condense stuff out of the flue gas stream and keeping an air-to-air heat exchanger clean and operating at near max efficiency can be difficult.

Tom Moritz

 

[rmw]

EAF indicates Electri Arc Furnace.

rmw

 

[tmoritz]

You mean you don't have to preheat the electrons?

Tom Moritz

 

[kenvlach]

Hi WayneLee409,
The following thread & links therein may be useful:
removal of gases iin electric arc furnaces
thread330-121151

Also, this paper is possibly useful:
'A thermodynamic model of the EAF process for stainless steel,'Sander Arnout et al., pp. 1325-1337 in Proceedings of EMC 2005.

http://pers

http://www.kuleuven.be/~u0043528/documents/arnout05_EMC2005.pdf

It mostly deals with the molten metal & slag, but Figure 6 shows the CO/CO₂ weight ratio as a function of process time. The ratio reaches about 212 at the end, so if you can figure out the quantity, can tell the fuel value.