6 replies to this topic

[farhan ahmed]

 I am sizing  a heater treater for crude & water separation 

I have done sizing of  the coalescing section but I have problems in sizing the heating section

and also please help me about the selection of heating method

relevant data:

heat duty calculated : 1.14 MMbtu/hr

inlet temperature   :     85 F

treating temperature :  105 F

 

thnx

 

waitng for the useful replies  

Attached Files

•  demulsifier treater (bhutto).xlsx   29.06KB   831 downloads

[shan]

You should use steam latent heat instead of sensitive heat.

[Art Montemayor]

Farhan:

 

If you have never designed a successfully operating heater treater, I would advise you to go no further without consulting with a company (or individual) who has done it before.   As Shan has pointed out, your basic heat transfer calculation is sadly flawed - and not from typos or math, but from basic heat transfer logic.  The only practical way to heat with steam is by utilizing the available latent heat it has - not sensible heat transfer.

 

A lot of empirical and experienced factors enter into the calculations of such specialty equipment and you have little chance to learn and apply these on your first effort.

 

[Engr.Asad]

Dear Shan,

Why Should he use the latent heat of steam rather than sensible heat?? farhan is using sensible heat because he is considering the outlet of steam in its superheated phase (check the temperature conditions at inlet and outlet of steam) as we can see steam is not changing its phase by considering its temperature..

Actually steam is transferring only its sensible heat ........

please correct me if i am wrong .. Thanks

[shan]

Latent heat contained in a mass unit of steam is much more than sensitive heat per unit of temperature change. I guess you may choose steam sensitive heat as your heating source of the oil treater if you don't care higher steam flow and more expensive boiler facility cost.

[farhan ahmed]

I studied about it and I found my mistakes by using superheated steam instead of saturated steam as saturated steam has higher overall heat transfer co efficient

 

now please reply to the second part of my question that's about the method of heating  for example direct / indirect fired heater may also used in such equipment please help me out in designing heating if I select direct fired heater

 Also please discuss the pros and cons of fired heater

 

thanks to all for their valuable response

[Engr.Asad]

finally its decided that he can use sensible heat of steam rather than latent heat.. thats what my point of view was..