Numerical Simulation And Experimental Study On The Temperature Field Of Fire Blocking In Valve Hall Of Converter Station Based On ANSYS

Converter station is an important station in the transmission system of the power grid,which is responsible for the task of converting direct current to alternating current or alternating current to direct current,which is an indispensable part of the power grid system.Moreover,the core area of the converter station is the valve hall,and the converter valve are the core components of the converter station.Therefore,it is an important research topic for contemporary researchers to ensure the safety of valve hall.Researchers have obtained a lot of research results,who have made deep research in the electromagnetic shielding field of valve hall,but the fire field is relatively paid low attention.However,the fire in converter station often occurs in recent years,which gives people the warning again and again,so it is imperative to study the fire protection field of converter station buildings.In this paper,the finite element analysis method is applied to the numerical simulation study of fire blocking,which is not only from the numerical simulation analysis,but also carry out experiments and analyze the experiment results.And then compare the results of experiment and simulation,and draw the following conclusions.In this paper,the finite element analysis method is used to build two fire blocking models with five fire blocking modules,aluminum silicate needle blanket,rock wool fire-proof board,ALC board and square steel.Under the condition of hydrocarbon temperature rise curve,the finite element analysis of the two models is carried out,and the thermodynamic parameters such as temperature field,heat flux density and temperature gradient are obtained.By comparing the model I and model II,the main conclusions are as follows:in terms of temperature field,the left temperature of model I is between 60-524℃.In contrast,the maximum temperature on the left side of model II finally reached below 151℃.In the aspect of temperature gradient vector,the temperature gradient disturbance in the second model is more obvious,which is beneficial to slow down the heat transfer.Compared with the node temperature,the acceleration of E₁ and G₁ is 0.0096℃/s and 0.0619℃/s respectively,which is much higher than that of C₂ and F₂,with the values of 0.0028℃/s and0.0078℃/s respectively.The heat transfer speed of model I is faster than that of model II.In conclusion,the fire performance of model II is better than that of model I.And then,the experimental results are compared with the simulation results in the model II,and the following conclusions are drawn:in terms of temperature field,the heat conduction velocity of the upper area（rock wool fire-proof board）of the fire-proof plugging model is significantly faster than that of the lower area（fire-proof module）,and the temperature field of the rock wool fire-proof board and fire-proof module presents gradient shape.Through the comparison of node temperature,the similarity of each node is high,and it is fitted by exponential function or power function with high fitting degree.The convection and radiation heat dissipation of the fire blocking model affect the experimental results.The results of experiment and numerical simulation are basically consistent,which shows that the model meets the requirements of fire protection design.Finally,We carried out the experiment research on the fire blocking model II and III,and the fire blocking model III is built based on the improvement the fire blocking model I.Under the temperature curve of customized heating plate,a comparative experimental study is carried out on the fire blocking model II and the fire blocking model III.In the aspect of temperature field,the area of red high temperature area is larger and larger in the model II,and the highest temperature is higher and higher.The temperature field of aluminum silicate needle blanket is higher than that of other materials,but plasticity and sealing compactness is excellent.In model III,the temperature field is controlled by the transverse and longitudinal heat transfer,and each region presents a stable stepped distribution,and the temperature field in the region increases continuously.Heat transfer not only exists from the fire side to the back fire side,but also exists transfer up and down and heat exchange inside the model.Comparing the final temperature of model II and model III,the fire protection effect of model III is better than that of model II.The overall structure of model II and model III is symmetrical,and model III is an improved version of model III（T-shape）.Model II and model III are better than model II in terms of fire performance,indicating that the shape and structure of the fire blocking model affect the fire protection effect.There are 34 pictures,6 tables,and 63 references.