Gas turbine, liquid fuel
Gas turbine, liquid fuel
(OP)
Gents, hope to get some insights to the following design proposal:
- We are looking at a field development with excess NGL's and would like to use these (some of it) for fuel
- We will have an NGL splitter, a reboiled absorber
- We will have diesel back-up so that we dont stop the turbines if the NGLs are out (duel fuel type gas turbine)
- I was thinking: Is there a need for a special NGL buffer vessel or will the reboiler serve this purpose?
- We are looking at a field development with excess NGL's and would like to use these (some of it) for fuel
- We will have an NGL splitter, a reboiled absorber
- We will have diesel back-up so that we dont stop the turbines if the NGLs are out (duel fuel type gas turbine)
- I was thinking: Is there a need for a special NGL buffer vessel or will the reboiler serve this purpose?





RE: Gas turbine, liquid fuel
Based on experience with a couple of troublesome units, I would want to be assured of a very extensive array of individual exhaust temperature measuring devices (thermocouples or RTD's) around the entire exhaust annulus to assure truly uniform distribution of the fueling and firing to avoid damaging hot spots. Averaging of the individual measuring points is fine for control purposes, but the individual points must be monitored continuously to assure proper operation.
At the very least, this should be a very interesting project. Since part of the purpose is to make good use of otherwise "waste" products, this should be carefully included in all performance and emission considerations. It may change all of the rules and criteria for the project.
Valuable advice from a professor many years ago: First, design for graceful failure. Everything we build will eventually fail, so we must strive to avoid injuries or secondary damage when that failure occurs. Only then can practicality and economics be properly considered.
RE: Gas turbine, liquid fuel
Thanks for the advice! If theres anybody out there with experience from a similar setup ii would still like to hear about the buffer vessel issue (if the reboiler is sufficient).
Best regards, Morten
RE: Gas turbine, liquid fuel
What is the supply temperature from the reboiler, and how stable is it? Fuel pre-heating isn't unusual but needs to be reasonably stable. Provided you can guarantee sufficient suction head at the HP fuel pump inlet and maintain it under shifting load conditions I don't see a problem - or are you considering not using an HP fuel injection pump and delivering high pressure fuel direct from process?
RE: Gas turbine, liquid fuel
As i said its a development project and we are considering various means of getting rid of the excess NGL.
The simulation currently says something in the 20-30ºC range. We have good experience from using dual fuel gas/diesel turbines but none wrt NGL/diesel. Most likely the pressure in the reboiler will be high enough to avoid a transfer pumps.
Thanks for the advice.
Best regards, Morten