Cross exchanger

Smaii-tube Tefion Chemical resistance of tubes no tube fouling. Clean fluids, condensing, cross-exchange. Low heat transfer coefficient. 2.0-4.0... 

These refer to hot and cold fluid terminal temperatures, inlet of one fluid versus outlet of the other. For a cross exchanger with no phase change, the ATm gives exact results for true countercurrent flow. Most heat exehang-ers, how ever, deviate from true countercurrent so a correction factor, F, is needed. 

One thing to be careful of in cross exchangers is a design having a so-called temperature cross. An example is shown in Figure 1. 

Cause A cross exchanger designed to cool absorber... 

Teflon no tube fouling. cross-exchange. coefficient. 2.0-4.0... 

Propane cross exchanger (liquid to gas) 14.2 8.2 11.6 9.1 Lower flow rate than used in calculations. 

Methane gas-Ethylene liquid cross exchanger 25 20 26.2 Uq drops to 10 after fouling with hydrate... 

Methane gas-propane liquid cross exchanger 25 17.9 19.7 Uq drops to 13 after fouling with hydrate ice. 

As C02 is absorbed, rich amine from the absorber bottom is fed into a cross-exchanger with lean amine before it is introduced into the stripper. The stripping temperature varies between 120 and 150°C, and the operating pressure reaches up to 5 bar. A water saturated C02 stream is released from the top and is subsequently ready for transport and storage, while lean amine leaving the stripper is pumped back into the absorber. 

Kinetic Parameters for PuO + Pu -> PuO +Pu Cross-exchange Calculated from Theoretical Values for Constituent Self-exchange in Aqueous Solution (5, 8)... 

This is also approximately true for solvent reorganization (Marcus, 1965). Thus, the standard fuel energy of activation, defined by (35) leads to expression (36) for k 2, in which /j2 is given by (37) and Ki2 is the equilibrium constant of the cross-exchange reaction. 

Fig. 4.6. Irreducible kernels with crossed exchange photon lines...

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