Multiple turbines

For multiple turbines (/ in number) the sum of impeller blade widths X should be used for W, and the average impeller height X 67// should be used for Cin the equations which include these terms. With turbines having different diameters on the same shaft, a weighted average diameter based on the exponents of in the appropriate equations should be used. 

Injection of Steam in the Combustor of the Gas Turbines Utilizing Present Dual Fuel Nozzles. Steam injection in the combustor has been commonly used for NO control as seen in Figure 2-43. The amount of steam, which can be added, is limited due to combustion concerns. This is limited to about 2-3% of the airflow. This would provide an additional 3-5% of the rated power. The dual fuel nozzles on many of the industrial turbines could easily be retrofitted to achieve the goal of steam injection. The steam would be produced using an HRSG. Multiple turbines could also be tied into one HRSG. 

Karow et al. (Kl), Rushton et al. (R12), and Oldshue (02) studied rates of absorption with multiple impellers, and their results indicate that incorrect spacing and operating conditions result in decreased capacities. Rushton et al. (R12) found that for ratios of liquid depth to tank diameter less than 2.5 it was not possible to alter the absorption coefficients more than +10% by the use of multiple impellers. They achieved a 25 % increase in the absorption coefficient by the use of multiple impellers for a system with liquid depth equal to 4 tank diameters, at a power input of about 3.5 hp/1000 gal. In the same system, the coefficient could be decreased by 50% if the impellers were not properly positioned. Advantages of multiple turbines accrue only at high air flows or at high power levels (1.8-3.6 hp/1000 gal). Disadvantages of multiple impellers may come about at low air flows, low power inputs, and with improper spacing of impellers. 

J.M.T. Vasconcelos, S.S. Alves, and J.M. Barata. Mixing in gas-liquid contactors agitated by multiple turbines. Chemical Engineering Science, 50 2343-2354, 1995. 

Use multiple turbines if the system is rapidly coalescing, to provide additional dispersion capability. 

Arrangement D shows a top nozzle that allows the exhaust steam line to run to a surface condenser servicing multiple turbines, as shown in Exhibit 4-2. 

During the 1980s, several distinctly different bioreactor designs (CSTR, Torus or horizontal loop bioreactor, jet loop bioreactor, compact loop bioreactor) were tested and compared at the Swiss Federal Institute of Technology, Zurich, by the group of Armin Fiechter. A reference fermentation with the strictly aerobic, non-fermentative, and glucose-insensitive yeast Trichosporon cutaneum on a defined medium was used [7]. The results of this study illustrate why the traditional CSTR, with multiple turbines, was and remains the most widely used reactor design. 

Use multiple turbines if the system is rapidly coalescing to provide additional dispersion capability. Axial flow turbines can also be used to achieve better uniformity in circulation. 

Semibatch Reactors. When other considerations preclude the use of in-Une mixers and large vessels must be used, two methods of minimizing or eliminating mixing deficiencies can be used. Both multiple turbines and multiple... 

Brayton system components can be developed to provide 200 kWe or more using existing design approaohes. Use of multiple turbines will necessitate the use of check valves and/or control valves which appear feasible, but are also developmental. 

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