چكيده به لاتين
With expansion of the industrial revolution and increasing use of energy especially in the current era, the danger alarm has been sounded because of inappropriate effect of environmental pollution on the life of human and other creatures on the Earth. One of the most important destructive effect of energy consumption on the environment is the distribution of warmth and heat. Therefore, for preventing the thermal pollution and increase of fuel consumption which resulted from the activities of the power plants, the heat control methods such as the heat exchanger (condenser) are used. One of the methods of increasing the efficiency of the heat exchanger of the power plants is the utilization of ball cleaning system. In this research, the ball cleaning operation has simulated in the condenser system of the Gilan Pareh-sar power plant and in addition to collection of related data of the heat transmission and effective factors in increasing thermal efficiency, the effects of balls in increasing the efficiency of the condenser, reduction of fuel consumption and distribution of the greenhouse gases have been performed. The most important investigated parameters in this simulation were the difference of the temperature and pressure around the condenser, its efficiency and thickness of the sediment layer in the internal wall of tubes. After investigating the external output data of simulation, the highest average of the seawater temperature in the summer was assumed as 27 Celsius degree as the worst weather conditions for operation of the condenser. According to the results, the highest efficiency slippage of the condenser was occurred up to the 0.9 mm thickness of sediment layer. Then, the reduction of the efficiency decreased after this amount which led to reduction of the operation of condenser up to 37%, increase of fuel consumption in the power plant for pre-heating the compensating input water to the boiler and daily production of 17 tons of CO2. Reduction of the temperature of the seawater in the winter as the best weather conditions for the operation of condenser led to the same condenser efficiency slippage in the 2.8 mm sediment thickness. Moreover, in the cold seasons of the year, the thickness of the sediment layer up to the 0.75 mm had the low effect on the operation coefficient of the condenser but as far as the thickness exceeds more than this amount, it will lead to the reduction of the heat transmission in the thermal exchanger. After condenser simulation of the Paresar power plant, the operation of ball cleaning system was investigated and compared through simulation of the thermal exchanger of the pre- cooler of this power plant based on the collected data and comparison of them with the real amounts which gained from the power plant. According to the results of these two parts, the reduction of the sediment thickness by the ball cleaning system effect on increasing the efficiency of the condenser and decreasing the fuel consumption of the pre-heater considerably.
Keywords: Condenser, thickness of sediment layer, ball cleaning system, efficiency, temperature difference
