Stream factor changes

Stream Factor Changes We assumed that for stream factors of 30%, 50%, and 70%, the raw materials requirement would be reduced proportionately, but capital-related costs do not change from the base case. We calculated the hydrogen price the same way as in the base case. 

Figure 10. Effect of change in stream factor on hydrogen price for 100 X 106 scf/day of hydrogen production hy various processes...

Pump B is the more economical choice. Note, however, that the difference is only about 2%. Small changes in the cost of electricity, the actual pump efficiencies, or the stream factor could shift the choice to pump A. 

Table II.1 which depends on the pellet size, so the familiar plot of effectiveness factor versus Thiele modulus shows how t varies with pellet radius. A slightly more interesting case arises if it is desired to exhibit the variation of the effectiveness factor with pressure as the mechanism of diffusion changes from Knudsen streaming to bulk diffusion control [66,...

The values of h, and b, i.e. The Tafel constants of the anodic and cathodic polarisation curves, first have to be measured directly in the laboratory or deduced by correlating values of AE/Ai measured on the plant with values deduced from corrosion coupons. The criticism is that the K value is likely to be inaccurate and/or to change markedly as conditions in the process stream change, i.e. the introduction of an impurity into a process stream could not only alter i but also the K factor which is used to calculate it. 

Where no phase change occurs, the following factors will determine the allocation of the fluid streams to the shell or tubes. 

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