On what criterion does gas turbine (GE machine) comes to temperature control? Or at least where can I find explanation of temp. control? I have observed that our frame 6 machine comes to temperature control at different exhaust temp. (ie. sometimes around 560 degC and sometimes around 585 degC).

 

CcpEng,

Consult the Control Specification document provided with the Speedtronic gas turbine control system; specifically Section 03. It will give you as much information as you might need.

Also, this topic has been covered <b>MANY</b> times before on control.com. There is a 'Search' field on the far-fight side of the Menu bar of every control.com page. (Use the Search 'Help' as the context of searches using this website's Search feature are different from many Internet search engines.)

Look for "CPD-biased exhaust temperature control" (with the double-quotation marks), +TTRX, +TTXM, etc.

CPD-biased exhaust temperature control is a function of axial compressor discharge pressure, which varies with ambient conditions, axial compressor and IGV cleanliness, machine conditions (internal clearances), and exhaust back-pressure. All of which have been covered in numerous threads on control.com--and all of which are available via the 'Search' feature.

If you can't get enough information from the Control Specification document.

Also, most gas turbine manuals provided by the turbine packager have sections detailing various aspects of the turbine and auxiliaries, including the control system and various control schemes and philosophies. Consult the manuals for more information, also.

If you still have specific questions after reading previous threads on control.com, we're here to help. But, the real value of forums like this is being able to see all of the valuable information that was provided in response to the same or similar questions that may have been asked in the past. Many people provide feedback to say if the information was useful or not--which greatly improves the value of the information provided for others who read the threads weeks, months or even years later. The GE-design heavy duty gas turbine Speedtronic control community has been active here on control.com for more than a decade. Many of the same questions have been asked and answered many times--and those threads (as they are called) have been viewed many times by many people over the years, and are one of the reasons why your preferred Internet search engine "directed" you to this site.

So, welcome to the site! Use it to its fullest--and then ask when you need more clarification. And, also use the available documentation at your site.