Figure 5 Solution flow rate for separator temperature.
Figure 5 shows the relation of solution flow rate and separator temperature for boiler outlet temperatures. Flow rate of absorbent solution (weak ammonia solution) decreases with the increase of vapour-liquid separator temperature.
The solution concentrations at inlet and outlet of absorber and the vapour concentration at absorber inlet decide the flow rate of absorbent solution. So rising vapour-liquid separator temperature can reduce the power of solution feed pump.
5. Conclusions
With regard to Kalina cycle which has the absorption-distillation-condensation system called DCSS (Distillation Condensation Subsystem), a cycle simulation program finds cycle characteristics. The cycle simulation is carried out for various turbine inlet vapour temperatures (such as 250, 300, 350 and 400℃), and vapour-liquid separator temperatures (at 60, 70 and 80℃).
The optimum Cycle efficiency is obtained as 28%, with turbine inlet vapour temperature at 400℃ and vapour liquid separator temperature at 60℃. Therefore, for the case of combined cycle power plant, the total efficiency will be increased to a value above 50%, which is effective as bottoming cycle power recuperation.
References
[1] A. I. Kalina, "Combined Cycle System with Novel Bottoming Cycle", Transactions of ASME, Journal of Engineering for Gas Turbines and Power, Vol.106 pp.737-742 (1984-10).
[2] Yasuyuki Ikegami and Haruo Uehara, "New Development and Future Prospect of Ocean Thermal Energy Conversion (OTEC)", Journal of the Marine Engineering Society in Japan, pp.741-747 (1999-11), (in Japanese).
[3] Staff report, "Kalina Cycle Tested at Canoga Park", Modern Power Systems, pp.17-19 (1992-3).
[4] Yoshiharu Amano, "Construction of the advanced co-generation system using ammonia/water system in Waseda University", Textbook of the Japan Society of Mechanical Engineers (No.99-61), pp.35-44 (1999-10), (in Japanese).
