Numerical Simulation And Application Research Of Bionic Cleaning Of Closed-Circulation Condenser

The condenser uses water as a cooling medium to receive and condense the steam exhaust of the steam turbine.It is an important cold-end equipment in the steam cycle of the steam turbine.The fouling of the condenser causes the heat transfer to deteriorate and the efficiency of the generator set to decrease,which is an urgent problem to be solved in the power plant.At present,condenser cleaning technology mainly includes rubber ball cleaning,chemical cleaning,high pressure water cleaning and ultrasonic cleaning.Although these cleaning methods can temporarily alleviate the fouling problem of the condenser,they have the disadvantages of polluting the environment and high cost.Therefore,research on new cleaning methods is very necessary.It is observed that the power plant near river can maintain a good cleaning condition even if the rubber ball is not cleaned.The analysis found that when these power plants directly draw water from the surrounding waters,the fine sand in the water is difficult to filter out,and the cooling water enters the condenser.The sediment in the water plays a good role in cleaning the condenser cooling water pipes.According to this paper,a bionic cleaning method is proposed in which the appropriate amount of sediment is added to the closed circulating cooling water to simulate the ecological environment of the open circulating cooling water,and the scale of the condenser cooling water pipe is cleaned by using the water flowing sand.In this paper,the theory of sediment movement and the mechanism of erosion corrosion were studied.The theoretical basis of water flow sedimentation and soil cleaning in the bionic cleaning method was studied by using Zhang ruijin formula and finnie micro-cutting model.The simulation of the bionic cleaning method was carried out by using the model of the condenser.The numerical simulation results using this method have higher accuracy,and the calculation results have a strong reference significance.The intensive condenser model was established.Based on the parameters of a power plant in Jiangsu Province,the effects of bionic cleaning under three cooling water flow rates were numerically simulated.By programming and visualizing the numerical simulation results,it was concluded that under different cooling water flow rates,Choose the appropriate sand diameter between 0.1mm~0.5mm to ensure the uniformity and effectiveness of cleaning.A single water pipe model was established to simulate the cleaning distribution of a single water pipe in the sediment flow.The three water flow velocities and the combined cleaning process of eight particle sizes were numerically calculated,and the cleaning effect was distributed along the circumferential direction of the water pipe.Regularity,when the distribution of dirt in the cooling water pipe is uneven,it provides a theoretical basis for sand diameter selection,and achieves targeted and effective cleaning.Design and reform the structure of the cooling tower,complete the sand recovery,and avoid the erosion of the sand pump to the circulating water pump.