Gas turbine's stability
Gas turbine's stability
(OP)
Hello, Everyone.
We want to build a big methanol production plant based coal.
We want to use an integrated coal gasification combined cycles plant to provide steam and power for this plant,this idea of coproduction of power and chemicals.
But somebody said a gas turbine have to stop for check the combustor and the blades of turbine every month. This will
disturb the stable production of chemicals.
But i find the such concept is very popular now. And ISAB plant in Italy use IGCC to provide steam and power for chemical plant, this plant can output 522MW power and run very well.
So I just want to ask several questions:
1)the longest time of continuous run of gas turbine;
2)how to avoid the disturb to the chemical plant;
3)If the IGCC have to stop very frequently, the concept of coproduction may be not feasible. But this concept of polygeneration is very popular, such as DOE's EECP, some chemical plants. What are their solutions?
We want to build a big methanol production plant based coal.
We want to use an integrated coal gasification combined cycles plant to provide steam and power for this plant,this idea of coproduction of power and chemicals.
But somebody said a gas turbine have to stop for check the combustor and the blades of turbine every month. This will
disturb the stable production of chemicals.
But i find the such concept is very popular now. And ISAB plant in Italy use IGCC to provide steam and power for chemical plant, this plant can output 522MW power and run very well.
So I just want to ask several questions:
1)the longest time of continuous run of gas turbine;
2)how to avoid the disturb to the chemical plant;
3)If the IGCC have to stop very frequently, the concept of coproduction may be not feasible. But this concept of polygeneration is very popular, such as DOE's EECP, some chemical plants. What are their solutions?






RE: Gas turbine's stability
Best solution is to contact GE, Westinghouse, Alstom etc.
RE: Gas turbine's stability
Just another option for your review. Good luck.
RE: Gas turbine's stability
RE: Gas turbine's stability
If our gas turbine and steam turbine can run for six months stablely, Everything is OK.
Now we already selected GE 9FA, the whole output is 280MW, so we can't use an N+1 design. Perhaps we should use an syngas-based boiler to supply the steam and power.
Another question is that we extract some high pressure air to the air separation unit for supplying oxygen to the gasifier, if the gas turbine shut down, the gasififer must be down. Then if we want to start the plant, it will last a long time. Can anyone do me a favor that how a igcc plant solve this problem?
RE: Gas turbine's stability
Combustor Inspection: Each 8000 EOH (Equivalent Operating Hours)The outage is complete between 3 or 4 days working with one shift of 12 hours. One time for year
Hot Gas Path Inspection: Each 24000 EOH. The outage is complete around 22 or 25 days working with two shifts of 12 hours each one. One time every three years.
Major Overhaul: Each 48000 EOH. The outage is complete around 30 or 32 days working with two shifts of 12 hours each one. One time every six years
You need to calculate the EOH using an equation. The formula consider full load trips, fuels: natural gas or oil etc. Normally each OEM (Original Equipment Manufacturer)has his own equations and formulas.
In our plant we have five Gas turbines model W501D5. One of our machines its running continuosly at base load condition for 93 days (3 months)
Recently SW inform to us that they have a new design gas turbines components more reliable for extend the time between every type of maintenance from 8000 EOH to 16000 EOH in others words you can run the machines more time because you don´t need to shutdown the gas turbines for do the preventive maintenance every 8000 EOH
Regards
Alberto J. Hung C
Caracas Venezuela