1 reply to this topic

[roy2377]

HI Everyone,

 

I need a bit of advice how to proceed with this problem.  Attached is the actual situation.

 

To start, I would like to say I am very limited in terms of information, but nevertheless I hope to get a result hopefully.

 

I am storing HEAVY FUEL OIL in a tank of dimension: diameter=2.85m Height=4.80m

I am using a coil of 15m, dimaeter 1.25 inches with X number of turn to heat that HFO.

 

Basically, the Steam is coming from a boiler pressurized at  7 bar.  

 

But the steam passing entering the Tank through the coil is pressurized at 2 bar.  I am assuming the Inlet temperature of the steam entering will be around 150 deg but I believe I can calculate that using my Superheated Water table and extrapolate to get this temperature.

 

The problem is that I am a bit confused based upon these conditions, how am I going to get the maximum temperature that the HFO can be heated.

 

Any advice would be very helpful.

 

In case I miss something, please do let me know.

 

Cheers

Roy

Attached Files

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[Art Montemayor]

Roy:

 

You are not explaining your query clearly and concisely.  The following is what I understand you are trying to describe (correct me if I’m wrong):

• You have an existing fuel oil storage tank that requires heating using an existing, installed internal steam coil.
• You know the diameter and height of the tank.  You also know the diameter of the coil pipe and the diameter of the coil itself.  However, you don’t know the number of coil turns or the coil heating surface.
• The steam fed to the coil will be at 2 barg; however, you don’t know if it is saturated or superheated.
• You want to know what is the maximum temperature that you can heat the fuel oil to using the described heating arrangement.  You do not state that you need to know the time required to effect the heat up, so I have to assume that you are willing to wait for as long as it takes to reach the maximum temperature.

If the above is accurate, then you should be able to heat up the fuel oil to approximately 5 ^oC below the temperature of the steam in the coil.  If the steam is saturated at 2 barg, its temperature should be 133 ^oC and you should get the fuel oil to 125 ^oC – if you wait long enough.

 

You cannot get a better answer because you fail to identify the conditions of your steam, the available heating area, the existence or lack of efficient mixing or creating of forced convection currents, tank insulation, ambient temperature, net fuel oil volume, etc., etc.

 

Additionally, I think you’ll come back and ask for the job to be done in a certain amount of time.  This can’t be calculated with the deficient amount of basic data you have supplied.