Partial recirculation

B3 the Flue Gas/TCR cycle—mixing the fuel with partially recirculated exhaust gases containing water vapour. 

Fig. 8.7 shows a second example (Cycle A2) of carbon dioxide removal by chemical absorption from a CCGT plant, but one in which the semi-closed concept is introduced— exhaust gas leaving the HRSG is partially recirculated. This reduces the flow rate of the gas to be treated in the removal plant, so that less steam is required in the stripper and the extra equipment to be installed is smaller and cheaper. This is also due to the better removal efficiency achievable—for equal reactants flow rate—when the volumetric fraction of CO2 in the exhaust gas is raised from the 4-6% value typical of open cycle gas turbines to about 12% achievable with semi-clo.sed operation. 

After fuel cell isothermal chemical oxidation (Figures 5.3 and 5.4), the depleted fuel, steam and CO2 exhaust is partially recirculated to... 

In soybean plants using hot dehulhng, the cracked soybeans are shocked by hot air to aid in the separation of the hull fraction from the meats fraction. The hot air conditioner uses either a hot air fluidized bed to heat and convey or hot air spouting to heat and a belt to convey. The hot air is partially recirculated for heat recovery. Hot air conditioners for soybean plants are provided by Buhler of Switzerland, Crown Iron Works of the United States, and Escher Wyss of Germany. 

The airflow circuit of the system in Figure 14.34a is open thus the operation of the dryer does not react to the operation of the primary circuit. In the case of solar dryers, with partial recirculation of the drying air [25], the condition of the air entering the dryer depends on the operation of the dryer itself... 

Figure 4.7 Fluid bed dryer with partial recirculation of inert particles.

For small systems, partial recirculation of the moist cathode exhaust air to the cathode inlet can be used for humidification (Fig. 4.25). In such a configuration, air is circulated at a high flow rate through the cathode compartment. Sufficient oxygen supply and water removal is achieved by opening the cathode exhaust valve, dependent upon the relative humidity in the cathode loop. 

Partial recirculation of hot, dedusted air to some of the chambers of the cooler may also improve the efficiency but this has to be paid for by a higher energy consumption for the fans. 

Fig. 20 Depiction of the time-dependent process yield of timisferred magnetite in continuous circulation of both phases using ricinoleic add (RA) as surfactemt (a), and the recovery of transferred magnetite by the implementation of a separation process using a partial recirculation operational mode for the miniplant (b)...

Mixture of a procontacted liquid with initial causes reduction of motive power forces mass transfer process in this connection contact steps without recirculation liquids and with partial recirculation liquids have been developed. Full division of an initial and procontacted liquid can be reached achieved due to introduction of an additional horizontal partition (Figuiel5.8) (Nurste, 1973 and Korotkov, 1972) or uses individual flow channels (Figure 15.8b) (Mamayev, 1978 Galkovski, 1979 and Galeyev, 1976). 

Partial recirculation, it is created by installation on (wed) below separators of inclined collars, reflective washers (Figurel5.9) (Mamayev, 1978 andNurste, 1973)oruse ofspecial system of liquid channels (Figure 15,9) (Galkovski, 1979). The raised increased metal consumption, complexity of manufacturing, and installation are the basic lacks of such steps. 

FIGURE 15.9 Contact steps with partial recirculation liquids (a)-with collars and(6)-with double input of a liquid. 

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