Research And Improvement Of High Pressure Water Descaling System For Billet In Baotou Steel Rail Beam Factory

China has the largest one belt,one road in the world today.The high-speed railway is not only an important infrastructure for economic development,but also an important starting point for China to implement the "one belt and one road".Due to the unreasonable design of high-pressure water descaling system and aging and backward equipment in Baotou steel rail and beam plant,the pressure in use is unstable,the descaling rate is low and the equipment operation state is poor,resulting in unclean descaling of billet,which seriously affects the quality of Baotou Steel Rail products.With the advantages of obvious effect,relatively simple equipment,low investment and strong stability,high-pressure water descaling process is widely used to remove iron oxide scale when producing hotrolled products in major iron and steel enterprises in the world.However,there are many parameters involved in high-pressure water descaling system,and there may be interaction between various parameters,so the rationality of parameter setting has a great impact on the descaling effect.Based on the analysis of the descaling mechanism,this thesis analyzes the influence of various parameters of the system on the descaling effect,and puts the research results into improving the descaling effect of high-pressure water in Baotou steel rail and beam plant by combining flow field simulation and construction verification.The specific research contents are as follows:(1)According to the application experience of descaling equipment in Baotou steel rail and beam plant and the preliminary research influencing factors,combined with the research results and theoretical knowledge in the field of high-pressure water descaling at home and abroad,the effects of process parameters(such as jet distance,rake angle)and nozzle structure parameters on the characteristics of nozzle jet are analyzed.This thesis focuses on the nozzle inlet velocity u,the impact target distance h of high-pressure water jet and the half angle of nozzle outlet in high-pressure water descaling process θ Three important influencing factors are studied from a quantitative perspective.(2)In order to test the accuracy and correctness of the numerical simulation model and its algorithm in the simulation of incompressible jet flow field,and understand the basic law of single jet among many nozzles in high-pressure water descaling header,the nozzle grid model and mathematical model are established.After comparing and analyzing the simulation results of nozzle model with relevant literature,the simulation results of billet temperature field are analyzed.The boundary conditions and constraints of the nozzle calculation model are specified one by one by using FLUENT software,and the control equation is discretized.In addition,the steady-state flow and heat transfer of high-pressure water descaling are simulated.(3)Aiming at the nozzle layout parameters and other descaling parameters in the actual descaling process,the nozzle grid model and mathematical model are established to study,and the best parameter combination is obtained.(4)The optimization results of high-pressure water descaling process parameters are verified in actual construction.I personally formulate the transformation scheme,equipment selection and procurement,and organize construction to verify the optimization results.