Estimation of heating time in tubular supercritical water reactors

▶ Increasing hout beyond 100 W/m2 K does not have a considerable impact on the temperature profile along the reactor. ▶ Pressure and external temperature have a small effect on the heating time constant of the SCW reactor; however, they may dramatically change the residence time in these reactors. ▶ The heating length strongly depends on the flow rate. ▶ A semi-theoretical model for calculating the heating time constant of a SCW reactor is proposed. Using this equation, the heating time and heating length of SCW reactors can be obtained.