The Study On The Cold-end Of Heller Type Air-cooling Unit

With the development of economy and the improving of people's living level in our country, the demand for energy increases greatly, especially for the electricity. On the structure of our country's electric power, fossil-fuel power is the chief power, so it plays an important role on the energy structure of our country. Due to our technology in generation of electricity behind the developed conntries, and the imbalance both in the distribution of water resources and on the structure of energy source in our country, the efficiency of fossil-fuel power generaton is lower than that of developed countries. Therefore, on the basis of the electric power generation mode of our country, from the view of well utilization of energy and water, develping air-cooling system is an important orientation for improvement of generating electricity. On the foundation of past researches on air-cooling unit's cold end, considering operation practice of Inner Mongolia' Fengzhen power plant air-cooling unit, the paper has carried through deeply study on operation status of turbine's end part on air-cooling unit, on running characteristic of eject vacuum condenser of Heller type air-cooling unit's cold end , and on the performance of air-cooling tower. With a view to increasing the efficiency and the safe operation of unit, via the study on the effect of eject vacuum condenser's back-pressure change to the unit's power, on the effect of heat transfer to the operation of eject vacuum condenser, on the performance of air-cooling tower, and on the frostbite –provent measures of air-cooling tower. The solving measures to the troubles occurred in Heller type air-cooling unit are put forward. The paper analyzes and demonstrates the schemes to solve these problems described above, and apply those to the Heller type air-cooling units cold end of Fengzhen power plant, and the results achieved are quite satisfactory. We get the conclusion that reasonable optimizing on the cold end of air-cooling units can improve the generation efficiency of the whole system and safety coefficient of the facilities operation.