System and method for controlling flow rate ratio

A system for controlling a recycle flow rate ratio, comprising:

• a fuel cell comprising an anode for generating a tail gas, the anode comprising an inlet and an outlet;
• a fuel reformer for mixing a fuel with the tail gas from the outlet of the fuel cell to generate a reformed stream, wherein the reformed stream is split into a first branch stream and a second branch stream at a splitting position, and the first branch stream is returned to the inlet of the anode of the fuel cell for power generation;
• a cooler for removing heat from the second branch stream;
• a bottoming cycle including an external or internal combustion engine driven in response to the cooled second branch stream;
• a measuring device for measuring differential pressures of two of the main stream, the first branch stream and the second branch stream;
• and
• a controlling device for controlling a flow rate ratio of the first branch stream to the main stream in real time in response to the measured differential pressures.