6 replies to this topic

[B-2 Spirit]

Hello Members,

I am currently doing a steam balance for a feasibility study of a Gas To Liquid facility. As I am not having any prior experience in this field, I have the following query:

From the FT unit we get very high amount of saturated MPSteam, what is the normal route for this steam, do we superheat it for use as drivers (turbine)
or we let it down to make superheated LP steam and use it.

I think the first option is more energy efficient, just wanted to confirm this, if anybody has worked in a gas to liquid facility.

just to give an idea, i am having around 100 tonnes of MP steam export from a FT unit designed for 288000 Nm3/h of syngas.

regards,
Alok

[Bobby Strain]

You must generate and sell power with all the steam produced.
Bobby

[Technical Bard]

MP Steam (< 400 psig) is generally not very efficient for use in turbines. You need to look at the rest of the GTL complex heat demands to see if there is any use for this steam as a heating medium.

[Dacs]

From the utility standpoint, superheating the steam will require an equipment to accomplish the task (fired heater maybe?). Unless you have this at hand, is it really practical to install one?

You can instead look at the possibility of having a surplus supply of MP and LP steam for your complex. Try to look at the whole picture when you opt to use it to drive a turbine with respect to the added expense to the boilers to produce MP/LP steam that could have been served by this excess steam otherwise.

[gegio1960]

Alok,
Very difficult to say which is the best option without an overview of the complex.
You can superheat the steam and use it in a local counter pressure turbine to generate power but then you have to find a way for the LP steam.
The best way should be to send your MP steam (SH or not) to a Power Plant for an "overall" management.
You may use the MP steam for a Stripper.
The letdown is the worst way.

[breizh]

Consider this resource to support your query , you will find a lot of good practices


http://www1.eere.ene...ment/steam.html


Breizh

[B-2 Spirit]

<sup>Many thanks to all of you. I also feel that using MP steam for turbine is not efficient and the worst is to let down. Thanks Breizh for your resources.

regards,
Alok</sup>