Can anyone let me know where I am going wrong. I am doing a calc to find how much power my refinery syngas will produce and I get some astronomical numbers.
In my opinion, your units are not correct when it comes to the power output. It should be [kW] and/or [MW].
Furthermore, more input data is required to answer you question adequately and fuel either HHV and/or LHV will just indicate the specific fuel consumption or just fuel consumption ...
For example, compression pressure ratio, gas turbine inlet temperature, mass flow rate etc.
Here are a few representative plots describing the gas turbine (Brayton Cycle) operation.
I have had a chance to do some additional numeric calculations.
I can report that for 1 [kg/s] of air, there should be 0.015 [kg/s] of fuel (natural gas/methane). Gas turbine inlet conditions are 15 [atm] and 1,500] resulting in getting 462 [kW] as the power output. Daily fuel requirements are as follows: 1,296 [kg/day].
I have to admit that your final number in terms of the fuel consumption is no longer as strange as I initially thought ...
I would suggest that gas turbine operating conditions be spelled out for the purpose of good engineering comparison ...