Thanks. I closed my consultancy to join Siemens Energy about a year and a half ago so the last year and a half has been very busy moving countries and getting settled. I’d like to finish off the videos I started on thermoacoustics and may continue the series to include annular combustors at some point privately but as the topic relates to the work I do for Siemens Energy I will need to get permission from them before releasing any new videos. So I can’t promise anything. Sorry.
Hello sir. Your video was very useful 4 years ago when I was preparing for an exam for my Masters. Now I started my doctoral studies, I'm 27 and I'm glad that I got scholarship for this. So I started but I don't t know what topic to choose. I finished Mechanical Faculty/ thermal engineering but now I work in a state company that works with power plants and we deal more with power and electrical stuff. Please suggest me interesting topics for my doctoral thesis cause I really don't know what to choose. I don't research much and I don't know what is relevant now. I will appreciate very much your opinion. Btw I'm from Macedonia and my country is not very developed.
This is a tough and somewhat personal question to ask. When I did my PhD I knew already I was interested in gas turbine combustion and so approached a number of universities where there were Professors I knew who were well known in that field. At the end of the day my supervisor from my Masters degree at Cranfield offered me two projects which were financed by Rolls Royce including tuition and living expenses and I chose the more interesting of the two. I didn’t have a scholarship for my PhD so having financial assistance helped me ultimately make that decision. I think it is important that you find Professors in a field you are interested in. And then speak with them about projects they might have. Also if possible go and visit the universities they are at and talk to them face to face to get an impression of what they are like and whether or not you think they would make a good supervisor. If you can talk to other students of theirs to get an impression that would also be useful. Immediately after finishing your PhD you might find it hard to find work in areas that are far away from your area of research as companies will think you will be unhappy unless you are working in the field you specialised in so keep this in mind. However long term it really doesn’t matter what topic you chose to do your PhD in. The main benefit of doing a PhD is to learn how to conduct research. Sorry I can’t be more helpful but I wish you luck with your studies.
Thank you very much. My mentor' s phd was on fuel cells and he did it 30 years ago. He proposed to me to do smth on fuel cells, but I have impression that hydrogen is not very relevant nowadays and that fuel cells are not much used. My bachelor was calculations for steam turbine power plant and my master thesis was on combined cycle power plant with steam and gas turbines. Now I don't t know what to do because truly I don't have motivation and I do it solely because I got scholarship. Thank you sir I appreciate your answer I will talk with my mentor again so we can find another topic.
I would actually say there is more interest in hydrogen today than ever before as it is seen as a potential energy storage medium in future power grids which are heavily dependent on nondispatchable renewables. However presently the round trip efficiency for using hydrogen as an energy storage medium is very low so we will see if this takes off in the long run. But certainly any topic related to energy storage would be very relevant in today’s world.
I can’t talk about specific burners such as the EV burner for example due to confidentiality but I could speak in generalities. Unfortunately right now I am very busy with work but when I get some free time again I will keep this in mind as a topic for a future video. Thanks.
There are a number of issues with hydrogen that would create problems for a gas turbine combustor which is optimised for natural gas to burn without modification. Hydrogen has a very low energy density compared to natural gas and so the volumetric flow rate of hydrogen will be significantly higher. This requires larger supply pipes and a larger total fuel nozzle area to maintain reasonable velocities and minimal pressure losses. Hydrogen is also considerably more reactive than natural gas with a significantly higher burning velocity. If it is desired to burn this premixed to minimise NOx emissions then the time available for mixing will likely be considerably shorter and so it is desirable to maximise the rate of mixing by increasing the surface area between the hydrogen and air entering the burners. I believe this is one of the main reasons newer premixed combustion systems are moving in a direction of a greater discretisation of the fuel and air supply to the combustion chamber.
@@engelbrechtgmbh i see thank you. Another question, what happens to out of commissioned gas turbines? Are they recycle or the whole system is refurbished/modified?
@@wanarif9223 This I can't really answer. My involvement in the GT industry has really been from the development side. My only involvement regarding service has been related to root cause analysis to try to understand the mechanism for failures. But other than that I have not really been involved in GT service. I would guess it really depends a lot on the engine and whether or not it is possible to refurbish and upgrade it. It also depends on the utility who owns the engine. Performance advances as well as reductions in emissions have been significant over the years and there maybe good motivation from the utility's side to completely scrap older engines and replace them with newer technology. Having said that the world's first gas turbine power plant which was commissioned in Neuchatel in 1939 remained in service until 2002.
@@engelbrechtgmbh seeing that the world is looking towards reducing carbon emissions, I wondered what will happen to old gas turbines that still emits a lot of pollution. I was not able to find any resources to answer my questions. Thank you for the answer tho.
@@wanarif9223 No problem. It is my understanding, listening to the leaders of the major OEM's at the ASME Turbo Expo and talking to colleagues, that it is believed the future for ground based gas turbines is for them to become a part of the hydrogen cycle for long term energy storage. Existing power plants can be modified to burn hydrogen and all of the OEMs are developing new combustion systems to be able to burn a larger and larger fraction of hydrogen in natural gas with the ultimate goal to be able to eventually burn 100% hydrogen. This of course is being done by the OEMs for new engines but there is no reason such systems couldn't be retrofitted into older engines and undoubtedly many utilities will want this. As I said though performance has increased over the years so very old engines which have low efficiency might be phased out in favour of higher efficiency newer engines. The hydrogen cycle for energy storage has a very low round trip efficiency so the higher the efficiency of the power plants converting hydrogen back into electricity the better the overall round trip efficiency of the cycle. I have a video on the future of gas turbines for power production which discusses this as well as alternative methods for energy storage.
Thanks for the explanation, for me this is pure gold. It will be very useful for my lectures on power plants at the university. Thanks a lot.
Thanks a lot for such an informative video for combustion and gas turbine technology.
Extremely valuable information thanks a lot
Amazing VIdeo
Very educational. Are you still intending to make a version for annual combustion.
Thanks. I closed my consultancy to join Siemens Energy about a year and a half ago so the last year and a half has been very busy moving countries and getting settled. I’d like to finish off the videos I started on thermoacoustics and may continue the series to include annular combustors at some point privately but as the topic relates to the work I do for Siemens Energy I will need to get permission from them before releasing any new videos. So I can’t promise anything. Sorry.
Hello sir. Your video was very useful 4 years ago when I was preparing for an exam for my Masters. Now I started my doctoral studies, I'm 27 and I'm glad that I got scholarship for this. So I started but I don't t know what topic to choose. I finished Mechanical Faculty/ thermal engineering but now I work in a state company that works with power plants and we deal more with power and electrical stuff. Please suggest me interesting topics for my doctoral thesis cause I really don't know what to choose. I don't research much and I don't know what is relevant now. I will appreciate very much your opinion. Btw I'm from Macedonia and my country is not very developed.
This is a tough and somewhat personal question to ask. When I did my PhD I knew already I was interested in gas turbine combustion and so approached a number of universities where there were Professors I knew who were well known in that field. At the end of the day my supervisor from my Masters degree at Cranfield offered me two projects which were financed by Rolls Royce including tuition and living expenses and I chose the more interesting of the two. I didn’t have a scholarship for my PhD so having financial assistance helped me ultimately make that decision. I think it is important that you find Professors in a field you are interested in. And then speak with them about projects they might have. Also if possible go and visit the universities they are at and talk to them face to face to get an impression of what they are like and whether or not you think they would make a good supervisor. If you can talk to other students of theirs to get an impression that would also be useful. Immediately after finishing your PhD you might find it hard to find work in areas that are far away from your area of research as companies will think you will be unhappy unless you are working in the field you specialised in so keep this in mind. However long term it really doesn’t matter what topic you chose to do your PhD in. The main benefit of doing a PhD is to learn how to conduct research. Sorry I can’t be more helpful but I wish you luck with your studies.
Thank you very much. My mentor' s phd was on fuel cells and he did it 30 years ago. He proposed to me to do smth on fuel cells, but I have impression that hydrogen is not very relevant nowadays and that fuel cells are not much used. My bachelor was calculations for steam turbine power plant and my master thesis was on combined cycle power plant with steam and gas turbines. Now I don't t know what to do because truly I don't have motivation and I do it solely because I got scholarship. Thank you sir I appreciate your answer I will talk with my mentor again so we can find another topic.
I would actually say there is more interest in hydrogen today than ever before as it is seen as a potential energy storage medium in future power grids which are heavily dependent on nondispatchable renewables. However presently the round trip efficiency for using hydrogen as an energy storage medium is very low so we will see if this takes off in the long run. But certainly any topic related to energy storage would be very relevant in today’s world.
nice !
Sir, Can you Please make a video on different types of Burners (Like Swirl Burners, EV Burners, etc. ) with their limitations?
I can’t talk about specific burners such as the EV burner for example due to confidentiality but I could speak in generalities. Unfortunately right now I am very busy with work but when I get some free time again I will keep this in mind as a topic for a future video. Thanks.
Hi Ahmed
Could you please share the download link for this software?
Can old gas turbines take in hydrogen as fuel? If not, is it as simple as changing the components of the gas turbine to take hydrogen as fuel?
There are a number of issues with hydrogen that would create problems for a gas turbine combustor which is optimised for natural gas to burn without modification. Hydrogen has a very low energy density compared to natural gas and so the volumetric flow rate of hydrogen will be significantly higher. This requires larger supply pipes and a larger total fuel nozzle area to maintain reasonable velocities and minimal pressure losses. Hydrogen is also considerably more reactive than natural gas with a significantly higher burning velocity. If it is desired to burn this premixed to minimise NOx emissions then the time available for mixing will likely be considerably shorter and so it is desirable to maximise the rate of mixing by increasing the surface area between the hydrogen and air entering the burners. I believe this is one of the main reasons newer premixed combustion systems are moving in a direction of a greater discretisation of the fuel and air supply to the combustion chamber.
@@engelbrechtgmbh i see thank you. Another question, what happens to out of commissioned gas turbines? Are they recycle or the whole system is refurbished/modified?
@@wanarif9223 This I can't really answer. My involvement in the GT industry has really been from the development side. My only involvement regarding service has been related to root cause analysis to try to understand the mechanism for failures. But other than that I have not really been involved in GT service. I would guess it really depends a lot on the engine and whether or not it is possible to refurbish and upgrade it. It also depends on the utility who owns the engine. Performance advances as well as reductions in emissions have been significant over the years and there maybe good motivation from the utility's side to completely scrap older engines and replace them with newer technology. Having said that the world's first gas turbine power plant which was commissioned in Neuchatel in 1939 remained in service until 2002.
@@engelbrechtgmbh seeing that the world is looking towards reducing carbon emissions, I wondered what will happen to old gas turbines that still emits a lot of pollution. I was not able to find any resources to answer my questions. Thank you for the answer tho.
@@wanarif9223 No problem. It is my understanding, listening to the leaders of the major OEM's at the ASME Turbo Expo and talking to colleagues, that it is believed the future for ground based gas turbines is for them to become a part of the hydrogen cycle for long term energy storage. Existing power plants can be modified to burn hydrogen and all of the OEMs are developing new combustion systems to be able to burn a larger and larger fraction of hydrogen in natural gas with the ultimate goal to be able to eventually burn 100% hydrogen. This of course is being done by the OEMs for new engines but there is no reason such systems couldn't be retrofitted into older engines and undoubtedly many utilities will want this. As I said though performance has increased over the years so very old engines which have low efficiency might be phased out in favour of higher efficiency newer engines. The hydrogen cycle for energy storage has a very low round trip efficiency so the higher the efficiency of the power plants converting hydrogen back into electricity the better the overall round trip efficiency of the cycle. I have a video on the future of gas turbines for power production which discusses this as well as alternative methods for energy storage.