Research On Smoke Flow Model Based On BIM Technology In Site Selection For Chimney Of Thermal Power Plant

When selecting a chimney in a thermal power plant,the spatial layout of the chimney in the building site is the first consideration in the design work.The flow state of flue gas will have a certain influence on the position of the chimney,especially in cold areas.If the chimney is not properly selected and the temperature continues to drop,due to the flue gas flow,the outer wall of the chimney will freeze and affect its service life.Will be analyzed in detail.In traditional architectural design,the simulation of flue gas flow is difficult to achieve.Usually only the layout drawings of buildings(structures)are considered,and the flue gas flow is often ignored due to other atmospheric stability and environmental factors.Impact,the visualization technology based on the building information model(BIM)has broken the design thinking mode based on the drawings and the two-dimensional space,and the three-dimensional modeling technology has more intuitively displayed the design scheme.You can continuously simulate and correct the icy state of the chimney to choose the best position.In the process of project implementation,the use of BIM technology not only saves construction costs,but also more effectively realizes the complete life cycle management of construction projectsFlue gas flow is uncertain and complicated to research.This dissertation discusses the study of flue gas flow model under neutral conditions and unstable environment affected by wind speed.In a neutral atmospheric environment,the flue gas diffusion model conforms to the Gaussian diffusion model.In this dissertation,the relevant factors affecting the flue gas diffusion are analyzed by the model,and the unknown parameters are solved by the empirical formula,so as to obtain the chimney affected by the flue gas flow safety distance in the direction of the downdraft.For different chimney heights,the flue gas flow state is also affected by the atmospheric stability,so the result of solving the diffusion equation under neutral conditions will also be different.Based on this,this dissertation also analyzes the atmospheric stability,mainly considering the effect of wind speed.Through statistical analysis of wind speed data in different regions,a Weibull distribution fitting curve is obtained,and its parameter values and basic average wind speed are obtained.The exponential method is extrapolated to derive the relatively accurate wind speed at the height of the chimney exitThis dissertation will study the example of flue gas flow in the chimney of a thermal power plant,analyze the smoke diffusion model,simulate the flow of smoke,and give an implementation plan to solve the problems related to smoke flow,and implement its visual dynamic simulation through unity,using the characteristics of BIM technology,the correct location of the chimney affected by smoke flow is solved,which shows the obvious advantages of BIM technology in building a visual model and optimizing the design.At the same time,through the statistical calculation of the wind speed data,the measurement method of wind speed under unstable atmospheric environment is given,so that the research plan is more complete.