Gas Turbine Cooling and Sealing

Hello all,
Cooling of gas turbine stages is done from compressor extracted air taken from different stages.
I am wondering that what is the use of BN , BT and TK fans .
 
syed taha ahmed,

Find the P&IDs (Piping and Instrmentation Diagrams) for the various systems of the turbine-generator and auxiliaries. (GE has called them Piping Schematics, or Schematic Piping Diagrams). They show, in very simple terms, how systems work and work together.

You may find these drawings in the Operations & Service Manuals provided with the turbine-generator and auxiliaries. There is usually one tab in the Manuals which is devoted to each and every system, and the components of the systems. In newer Manuals, the individual P&IDs are supplied in each of the System Description tabs.

If I recall correctly, the BN fans are used to cool the bearing housing in the gas turbine exhaust of F-class machines. The BT fans are used to provide cooling air for the turbine compartment. And, the TK fans are used to cool the gas turbine exhaust frame.

A lot of people (falsely) believe the P&IDs are difficult to read or understand. That is the far from the truth. Are they intuitively obvious (meaning do they make perfect sense the very first time you look at them--or even the third time)? No. But, as P&IDs go in the industry, they are probably some of the easiest and best system drawings one will ever encounter. Combined with the System Descriptions in the Operations & Service Manuals, they are critical to understanding how GE-design heavy duty gas turbines and auxiliaries work, and work together. Do they tell when the fans start and stop? No. That's contained in the Mark* turbine control system programming--which is easier, much easier, to begin to understand once one has a good command of the P&IDs.

Why? Because almost all of the devices that are connected to the Mark*, and monitored or controlled by the Mark* (including devices that are not monitored or controlled by the Mark*--but which are important to the control and protection of the turbine-generator and auxiliaries) are shown on the P&IDs. (Notable exceptions include the generator protection equipment, and exciter and LCI (SFC) I/O (Inputs and Outputs).)

I know that at some sites the Operations & Service Manuals are not made easily available to Operators, or even Technicians (Mechanical- or Instrument & Control Technicians). BUT, they should be. A plastic-laminated set of P&IDs should be on the Operators' Console/Desk in EVERY plant control room. And, in EVERY Operations Manager's office, and in EVERY Plant Manager's office. And, each technician should have their own set of P&IDs, on which they can make notes as they find things and learn things about the system and the actual device/instrument locations on the turbine-generator and auxiliaries. Since you, syed taha ahmed, are asking these questions, you should have your own copies of the P&IDs (and even the System Descriptions--they are usually only two or three pages long). AND, you should be making your own notes on your copies as you learn things. There is absolutely NO BETTER WAY to familiarize one's self with the systems and components and how they interact with each other. None. Zero. Zilch. Zip. Nada. Niente. Period. Full stop. Because if you will study the P&IDs (including reading the 'Notes' section of each one!), and ask questions here and of knowledgeable and experienced people at your site, you will come to know and understand the unit and how it operates as well or better than anyone else on your site.

AND, if you will take the P&IDs out to the unit when it's not running, and especially when it's shut down for maintenance, and find each of the devices on the P&IDs you will know even more than most others on your site--which can be helpful to you and your career at this, and maybe other, similar power plants (especially those with GE-design heavy duty gas turbines!). Make this investment of your time and in your career.

FINALLY, the GE-design heavy duty gas turbine controls community has been going strong here on Control.com for nearly 20 years!!! And, you will find a LOT of your questions may have already been answered (probably). If you need to have something clarified that was written in a previous thread, you can post in that thread (there are VERY few closed threads on Control.com). And, if you don't find you question by using the 'Search' feature of Control.com, then, please--open a new thread with your question.

Welcome to Control.com, where "Feedback is the most important contribution!"(c) If you find the information provided to you here on Control.com, PLEASE use the 'Like' feature--or post a sentence or two with your thanks. Those who post information here on Control.com get paid the same amount as you did when you post your question(s): Nothing. So, we like to hear if our help was useful--or not. Sometimes, the information provided is not exactly what you needed--but perhaps it got you thinking and pointed in a different ("the right") direction that leads to resolving the issue. MANY OTHER PEOPLE read these threads on Control.com--not just when they're new, but for years and decades afterwards. So, when they read that other people find the information useful (or not, as the case may be) that helps them to know if the information may help to resolve their problem or interest. There are LOTS of forums (fora, some say) on the World Wide Web--but the thing which sets Control.com apart from most of them is: The feedback. It really makes the information provided useful and gives those reading it confidence in the veracity of the information being provided. And, if you really don't find the information useful or informative, we don't mind constructive criticism. Tell us how it can be better--because we want it to be among the best information you will find on the World Wide Web.
 
syed taha ahmed,

Find the P&IDs (Piping and Instrmentation Diagrams) for the various systems of the turbine-generator and auxiliaries. (GE has called them Piping Schematics, or Schematic Piping Diagrams). They show, in very simple terms, how systems work and work together.

You may find these drawings in the Operations & Service Manuals provided with the turbine-generator and auxiliaries. There is usually one tab in the Manuals which is devoted to each and every system, and the components of the systems. In newer Manuals, the individual P&IDs are supplied in each of the System Description tabs.

If I recall correctly, the BN fans are used to cool the bearing housing in the gas turbine exhaust of F-class machines. The BT fans are used to provide cooling air for the turbine compartment. And, the TK fans are used to cool the gas turbine exhaust frame.

A lot of people (falsely) believe the P&IDs are difficult to read or understand. That is the far from the truth. Are they intuitively obvious (meaning do they make perfect sense the very first time you look at them--or even the third time)? No. But, as P&IDs go in the industry, they are probably some of the easiest and best system drawings one will ever encounter. Combined with the System Descriptions in the Operations & Service Manuals, they are critical to understanding how GE-design heavy duty gas turbines and auxiliaries work, and work together. Do they tell when the fans start and stop? No. That's contained in the Mark* turbine control system programming--which is easier, much easier, to begin to understand once one has a good command of the P&IDs.

Why? Because almost all of the devices that are connected to the Mark*, and monitored or controlled by the Mark* (including devices that are not monitored or controlled by the Mark*--but which are important to the control and protection of the turbine-generator and auxiliaries) are shown on the P&IDs. (Notable exceptions include the generator protection equipment, and exciter and LCI (SFC) I/O (Inputs and Outputs).)

I know that at some sites the Operations & Service Manuals are not made easily available to Operators, or even Technicians (Mechanical- or Instrument & Control Technicians). BUT, they should be. A plastic-laminated set of P&IDs should be on the Operators' Console/Desk in EVERY plant control room. And, in EVERY Operations Manager's office, and in EVERY Plant Manager's office. And, each technician should have their own set of P&IDs, on which they can make notes as they find things and learn things about the system and the actual device/instrument locations on the turbine-generator and auxiliaries. Since you, syed taha ahmed, are asking these questions, you should have your own copies of the P&IDs (and even the System Descriptions--they are usually only two or three pages long). AND, you should be making your own notes on your copies as you learn things. There is absolutely NO BETTER WAY to familiarize one's self with the systems and components and how they interact with each other. None. Zero. Zilch. Zip. Nada. Niente. Period. Full stop. Because if you will study the P&IDs (including reading the 'Notes' section of each one!), and ask questions here and of knowledgeable and experienced people at your site, you will come to know and understand the unit and how it operates as well or better than anyone else on your site.

AND, if you will take the P&IDs out to the unit when it's not running, and especially when it's shut down for maintenance, and find each of the devices on the P&IDs you will know even more than most others on your site--which can be helpful to you and your career at this, and maybe other, similar power plants (especially those with GE-design heavy duty gas turbines!). Make this investment of your time and in your career.

FINALLY, the GE-design heavy duty gas turbine controls community has been going strong here on Control.com for nearly 20 years!!! And, you will find a LOT of your questions may have already been answered (probably). If you need to have something clarified that was written in a previous thread, you can post in that thread (there are VERY few closed threads on Control.com). And, if you don't find you question by using the 'Search' feature of Control.com, then, please--open a new thread with your question.

Welcome to Control.com, where "Feedback is the most important contribution!"(c) If you find the information provided to you here on Control.com, PLEASE use the 'Like' feature--or post a sentence or two with your thanks. Those who post information here on Control.com get paid the same amount as you did when you post your question(s): Nothing. So, we like to hear if our help was useful--or not. Sometimes, the information provided is not exactly what you needed--but perhaps it got you thinking and pointed in a different ("the right") direction that leads to resolving the issue. MANY OTHER PEOPLE read these threads on Control.com--not just when they're new, but for years and decades afterwards. So, when they read that other people find the information useful (or not, as the case may be) that helps them to know if the information may help to resolve their problem or interest. There are LOTS of forums (fora, some say) on the World Wide Web--but the thing which sets Control.com apart from most of them is: The feedback. It really makes the information provided useful and gives those reading it confidence in the veracity of the information being provided. And, if you really don't find the information useful or informative, we don't mind constructive criticism. Tell us how it can be better--because we want it to be among the best information you will find on the World Wide Web.
Thanks for your advice. I will definitely start to write notes on P&IDs locating KKS . Thanks for your time.
 
Top