Regarding the issues with the turbine, I hope everyone can offer some suggestions.
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Here we carry out hydrogenation reforming in order to produce catalytic diesel. To prevent organic nitrogen from affecting the reforming agents, it was decided to increase the hydrogen partial pressure slightly. As the system pressure increased, it was observed that the speed control valve of the turbine suddenly opened wider on its own, going from 75% to 97% directly. Shouldn’t the valve opening be determined solely by the rotational speed as well as the pressure and flow rate of the medium-pressure steam? It’s truly unbelievable; I hope turbine experts can offer some advice.
Your modulation range is too wide; this is very dangerous
Yeah, but what’s confusing is that since the steam pressure and temperature remain basically unchanged, why does increasing the pressure lead to an increase in the valve opening? Shouldn’t this result in an increased load? Won’t the turbine be unable to handle it, or is the turbine simply not designed properly?
There are two reasons: first, excessive urging of the fuel leads to a decrease in purity during circulation, an increase in molecular weight, and thus a greater amount of power required by the circulation machine； Secondly, when the system pressure is high, the pressure at the inlet of the circulator is high as well; this results in an increased amount that can be drawn in, thereby raising the circulation volume. For reference only
I understand both of these points; what I don’t understand is whether the valves increase as the volume of circulation increases
As the molecular weight of the circulating hydrogen increases, more power is required to maintain the set rotation speed. The system pressure rises, which leads to an increase in the inlet flow rate; therefore, the main steam valve must be opened wider to meet the requirements. You can have the laboratory analyze the change in the average molecular weight of the gas.
(1) With the valve opening remaining constant, as the hydrogen purity in the recycled hydrogen decreases and its average molecular weight increases, the amount of recycled hydrogen will rise. (2) Increasing the system pressure: Due to salt deposition in the high-pressure heat exchanger, the system pressure difference increases, which leads to a decrease in the pressure at the inlet of the hydrogen circulation pump as well as a drop in its rotation speed. To maintain the set rotation speed, it is necessary to open the valves more widely; however, opening them to 97% is somewhat excessive. It is recommended that the steam pressure be 3.5 MPa with a temperature of no less than 360°C, or 3.2 MPa
Thanks, I’m checking the reason now; it’s likely that the turbine was designed to be too small