복수기 진공영향인자 분석을 통한 발전소 효율향상방안에 관한 연구 (A) Study on the improvement of plant efficiency by analyzing the factors that affect the vacuum of main condenser원문보기
There are several ways to improve the efficiency of a power plant. Firstly, it is attained by increasing the steam enthalpy coming into the turbine, which can be done by maximizing the potential energy through increment of steam temperature and pressure. Secondly, it can be attained by maximizing th...
There are several ways to improve the efficiency of a power plant. Firstly, it is attained by increasing the steam enthalpy coming into the turbine, which can be done by maximizing the potential energy through increment of steam temperature and pressure. Secondly, it can be attained by maximizing the turbine work by decreasing saturated pressure of main condenser. Thirdly, the heat output can be maximized through the prevention of decrement of secondary calorimetric power in COLSS by precise measurement of mass flow rate of feed water and steam. In this thesis, on the basis of Yong-Gwang nuclear power plants #3 and #4, It is intended to suggest a measure to increase the efficiency of power plant through vacuum control by analysing the factors that affects a vacuum of main condenser. Many in nuclear power plants have experienced availability decrease due to vacuum loss. In recent days CEOG have analyzed the unplanned capacity loss in the nuclear power plants in the US to which CE has supplied NSSS equipment. The unplanned capacity loss related to main condenser vacuum for 4 years, from 1993 to 1996, was 17,633 MWh/unit · yr, the third highest main factor. The occurrence rate was 8.6/unit · yr, the highest occurrence rate among the main factors. In the domestic cases, the unplanned capacity loss related to main condenser vacuum is getting higher and higher being headed by Yong-Gwang nuclear power plants and U1-Jin nuclear power plants due mainly to temperature changes of sea water and to the inflow of oceanic lives respectively. In this thesis, It is considered and analyzed about the pressure changes of condenser in the event of temperature changes of sea water, changes of load, cleanliness factor of condenser tube, mass flow rate of circulating sea water and the water box blocking of circulating sea water. It is also considered about heat transfer mechanism by air inflow and the condensate depression phenomenon induced by excessive cooling of condensate. The result will contribute to decide optimum operating time of circulating pump complying with the decrease or increase of sea water temperature for the saving of electric power consumption in unit, to predict a pressure increase of condenser in response to respective circulating water temperature when circulating water box is blocked to maintain the system failures related to main condenser vacuum and solve the subsequent load control quantity and present standard vacuum corresponding to the respective variable factors that affect a vacuum of main condenser. It is also formulated a plan to improve reliability for the systems and the factors that affect a vacuum, and to manage the vacuum by using check list of the factors.
There are several ways to improve the efficiency of a power plant. Firstly, it is attained by increasing the steam enthalpy coming into the turbine, which can be done by maximizing the potential energy through increment of steam temperature and pressure. Secondly, it can be attained by maximizing the turbine work by decreasing saturated pressure of main condenser. Thirdly, the heat output can be maximized through the prevention of decrement of secondary calorimetric power in COLSS by precise measurement of mass flow rate of feed water and steam. In this thesis, on the basis of Yong-Gwang nuclear power plants #3 and #4, It is intended to suggest a measure to increase the efficiency of power plant through vacuum control by analysing the factors that affects a vacuum of main condenser. Many in nuclear power plants have experienced availability decrease due to vacuum loss. In recent days CEOG have analyzed the unplanned capacity loss in the nuclear power plants in the US to which CE has supplied NSSS equipment. The unplanned capacity loss related to main condenser vacuum for 4 years, from 1993 to 1996, was 17,633 MWh/unit · yr, the third highest main factor. The occurrence rate was 8.6/unit · yr, the highest occurrence rate among the main factors. In the domestic cases, the unplanned capacity loss related to main condenser vacuum is getting higher and higher being headed by Yong-Gwang nuclear power plants and U1-Jin nuclear power plants due mainly to temperature changes of sea water and to the inflow of oceanic lives respectively. In this thesis, It is considered and analyzed about the pressure changes of condenser in the event of temperature changes of sea water, changes of load, cleanliness factor of condenser tube, mass flow rate of circulating sea water and the water box blocking of circulating sea water. It is also considered about heat transfer mechanism by air inflow and the condensate depression phenomenon induced by excessive cooling of condensate. The result will contribute to decide optimum operating time of circulating pump complying with the decrease or increase of sea water temperature for the saving of electric power consumption in unit, to predict a pressure increase of condenser in response to respective circulating water temperature when circulating water box is blocked to maintain the system failures related to main condenser vacuum and solve the subsequent load control quantity and present standard vacuum corresponding to the respective variable factors that affect a vacuum of main condenser. It is also formulated a plan to improve reliability for the systems and the factors that affect a vacuum, and to manage the vacuum by using check list of the factors.
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