Analysis And Optimization Design Of Top-combustion Type Hot Blast Stove Furnace Shell Considering Thermal-stress Coupling Effect And Earthquake Effect

Hot blast stove is the important equipment in ironmaking production, as a new typeof hot blast stove, top-combustion type hot blast stove received widespread attentionafter it was put into use. With high blast temperature, high thermal efficiency and theadvantages of long life, top-combustion hot blast stove have a good application prospect.However, at present in our country, the design of top-combustion type hot blast stovemainly based on experience and referenced to the technical specification for ironmakingprocess furnace shell structure. Specification did not make clear requirements fortemperature effect, the influence of the seismic effect of the furnace shell, it also lackadequate theoretical basis for calculation formula of furnace shell thickness. So a finiteelement analysis in a variety of working conditions for top-combustion type hot blaststove, and the reasonable optimization of furnace shell thickness for similar design ofhot blast stove have a guiding significance in the future, at the same time, the finaloptimization schemes also have engineering value.In this paper, the main work done in three aspects: first, according to the theory offinite element and shell theory, by APDL language means of the finite element analysissoftware Ansys, then a finite element model consistent with the actual furnace shellstructure is established, it is the foundation of subsequent optimization work, includingreasonable division of the furnace shell and realizing the parameterized; Second,thermal-stress coupling effect, static effect and earthquake effect three influence factors,the furnace shell structure has been separately carried on the finite element simulationanalysis under various operating conditions to get the stress distribution anddisplacement deformation, the most unfavorable load combinations and the most unfavorable load analysis have been carried on according to the specificationrequirements; Third, on the basis of the most unfavorable load combination effectanalysis, the furnace shell thickness as the design variables, the board with themaximum stress as state variables, allowable stress value as constraint conditions toachieve the goal of minimizing the volume of furnace shell structure with steel designhas carried on the coMParative analysis between the plans before and afteroptimization.Through the above three aspects obtained the following main conclusions:(1) The gas pressure inside the furnace shell makes the largest contribution to thestress of the furnace shell, it is the main factor which influences the thickness of furnaceshell;(2) Thermal-stress coupling has influence on displacement deformation of thefurnace shell, and the part where displacement deformation be constrained is the mainpart where stress accour;(3) The seismic action has little effect of the whole furnace shell, but its effect onthe section of the hearth should not be ignored during the design;(4) CoMPared to the original design, steel amount of the final optimized schemehas decreased by14.3%, after optimizing, the thickness of the weak parts of the furnaceshell structure (part of the edge of the orifice and the hearth section, etc.) increases, theother parts of the furnace shell thickness decreases obviously, the overall stress morereasonable.