CN-121997671-A - Flow-heat-solid coupling-based hydrogen-based shaft furnace high-temperature valve spline pair service performance analysis method

CN121997671ACN 121997671 ACN121997671 ACN 121997671ACN-121997671-A

Abstract

The invention discloses a flow-heat-solid coupling-based method for analyzing service performance of a spline pair of a high-temperature valve of a hydrogen-based shaft furnace, and belongs to the technical field of hydrogen metallurgy. The method comprises the steps of establishing a three-dimensional model and a fluid calculation domain and a solid calculation domain thereof, carrying out attribute and parameterized grid division on the fluid calculation domain and the solid calculation domain, constructing a steady-state simulation model, reduced iron particles and a motion model thereof, carrying out thermal-flow coupling simulation, solving a temperature field of the steady-state simulation model, solving thermal deformation and stress fields of a spline pair through a finite element method based on a temperature field combined temperature-stress coupling equation, analyzing service performance parameters of the high-temperature valve spline pair based on the temperature field, the thermal deformation and the stress field, and evaluating service performance of the high-temperature valve spline pair. The method can meet the requirements of rapid and accurate analysis of the service performance of the high-temperature valve of the hydrogen-based shaft furnace and rapid iterative verification of parameter optimization, has strong universality, and has wide application prospect under the background of gradual popularization of the hydrogen-based reduction iron-making process.

Inventors

TAO GUIBAO
TAN YANFANG
ZHENG JUN
HUANG XIAOHUI
DAI WENJUN
LU JUNHUI
CAO HUAJUN

Assignees

重庆大学
中冶赛迪技术研究中心有限公司

Dates

Publication Date: 20260508
Application Date: 20260205

Claims (10)

1. A method for analyzing service performance of a high-temperature valve spline pair of a hydrogen-based shaft furnace based on flow-heat-solid coupling is characterized by comprising the following steps: Step 1, obtaining design parameters of a spline pair of a high-temperature valve of a hydrogen-based shaft furnace, establishing a three-dimensional model based on the design parameters, and establishing a fluid calculation domain and a solid calculation domain of the three-dimensional model; step 2, performing attribute and parameterized grid division on the fluid computing domain and the solid computing domain to generate a structured network of the whole three-dimensional model and an encryption network of a key area; step 3, constructing a steady-state simulation model and a reduced iron particle and a motion model thereof based on a fluid calculation domain and a solid calculation domain; step 4, carrying out heat-flow coupling simulation and solving a temperature field of a steady-state simulation model; step 5, solving thermal deformation and stress fields of the spline pair by a finite element method based on a temperature field combined temperature-stress coupling equation; And 6, analyzing service performance parameters of the high-temperature valve spline pair based on the temperature field, the thermal deformation and the stress field, and evaluating the service performance of the high-temperature valve spline pair.
2. The method for analyzing service performance of the spline pair of the high-temperature valve of the hydrogen-based shaft furnace based on flow-heat-solid coupling according to claim 1, wherein in the step 1, a three-dimensional model is built based on design parameters, and a fluid calculation domain and a solid calculation domain of the three-dimensional model are built, specifically: Step 101, drawing a tooth surface involute in three-dimensional modeling software based on design parameters of a spline pair of a high-temperature valve of a hydrogen-based shaft furnace to generate a spline pair tooth shape, completing assembly of main parts of the high-temperature valve, and establishing a three-dimensional model of a main structure of the high-temperature valve, wherein the main parts comprise a rotor, a rotating shaft and a bearing; Step 102, adopting an interference-free evaluation method in three-dimensional modeling software to ensure that a model has no self-interference phenomenon, and carrying out model pretreatment inspection and profile restoration work in finite element simulation software to complete the construction of a solid calculation domain; Step 103, establishing a boundary model of a fluid calculation domain, and establishing the fluid calculation domain by adopting volume extraction or Boolean operation, wherein the fluid calculation domain comprises a cooling liquid fluid domain and a high-temperature particle fluid domain; 104, establishing a wall boundary condition, wherein the wall comprises a left tooth surface, a right tooth surface, a rotating shaft outer wall surface, a cooling flow channel inner wall surface, a particle fluid domain outer wall surface and other wall surfaces of a rotor of a spline pair, and setting a heat transfer type according to an actual service condition, wherein the heat transfer type comprises heat transfer and heat convection; step 105, setting an inlet and an outlet of the cooling liquid fluid domain and the high-temperature particle fluid domain, and deleting the boundary model of the fluid calculation domain at the inlet and outlet position.
3. The method for analyzing service performance of the spline pair of the high-temperature valve of the hydrogen-based shaft furnace based on flow-heat-solid coupling according to claim 2, wherein in the step 2, attribute and parameterization meshing is performed on a fluid calculation domain and a solid calculation domain, and a structured network of an integral three-dimensional model and an encryption network of a key area are generated, specifically: step 201, based on Lagrangian coordinates, carrying out grid division on a fluid calculation domain and a solid calculation domain, wherein a rotating shaft and a cooling liquid fluid domain are divided by adopting a hexahedral dominant network, and a rotor and a high-temperature particle fluid domain are divided by adopting tetrahedral grids; And 202, carrying out grid encryption on a key area, wherein the key area comprises left and right tooth surfaces of the spline pair and a cooling liquid fluid domain.
4. The method for analyzing service performance of the high-temperature valve spline pair of the hydrogen-based shaft furnace based on flow-heat-solid coupling according to claim 3, wherein in the step 3, a steady-state simulation model, reduced iron particles and a motion model thereof are constructed based on a fluid calculation domain and a solid calculation domain, specifically comprising the following steps: step 301, setting a k-epsilon turbulence viscosity model for a fluid calculation domain, and simulating fluid domain turbulence motion, wherein the fluid domain turbulence motion is respectively provided with cooling fluid turbulence and reduced particle conveying corresponding to a cooling fluid domain and a high-temperature particle fluid domain; Step 302, creating a discrete phase and a jet source, and randomly generating reduced iron particles meeting a size range; Step 303, for the particle reduction process, selecting a transmission model of the component model, a volume reaction and a reaction type of the particle surface reaction, and defining a reaction equation.
5. The flow-heat-solid coupling-based hydrogen-based shaft furnace high-temperature valve spline pair service performance analysis method according to claim 4, wherein the k-epsilon turbulence viscosity model defines vortex viscosity as follows: in the formula, In the form of a vortex viscosity, Is a constant value, and is used for the treatment of the skin, In terms of the viscosity of the fluid, In order for the energy of the turbulence to be that of the light, Is the turbulent dissipation ratio; The k-epsilon turbulence viscosity model defines a transport equation as: in the formula, As an average velocity component in different directions, In order to obtain the molecular motion viscosity, For the turbulent viscosity coefficient, For the generation of the term of the turbulent energy k, 、、、 Is a model constant.
6. The method for analyzing service performance of the spline pair of the high-temperature valve of the hydrogen-based shaft furnace based on the flow-heat-solid coupling according to claim 5 is characterized in that in the step 4, heat-flow coupling simulation is carried out, and a temperature field of a steady-state simulation model is solved, specifically: Setting unit area conditions, namely corresponding to the fluid calculation domain and the solid calculation domain, controlling fluid flow in the fluid calculation domain, a reduction process and conjugate heat transfer between the fluid calculation domain and the solid calculation domain; Step 402, setting boundary conditions to limit a flow field solving range, including defining attributes of an inlet, an outlet, a wall surface and an internal interface, wherein a speed inlet and a pressure outlet are selected to meet a continuity equation, a momentum equation and an energy equation; step 403, selecting a pressure-speed coupling algorithm, setting a relaxation factor and a convergence criterion, adopting standard initialization, setting iteration times and interval time, solving a continuity equation, a momentum equation, an energy equation and a k-epsilon turbulence model, and monitoring a residual curve until the convergence condition is met, so as to obtain a heat transfer equation related to heat-flow coupling.
7. The method for analyzing service performance of the spline pair of the high-temperature valve of the hydrogen-based shaft furnace based on flow-heat-solid coupling according to claim 6, wherein a continuity equation and an N-S equation are as follows: in the formula, 、、、 The non-dimensional gradient operator, the speed, the pressure and the volume force are respectively adopted, and Re is the Reynolds number; the momentum equation and the energy equation are respectively: Where U is the velocity tensor, p is the pressure on the fluid infinitesimal, δ is the unit tensor, S M is the mass force, μ l is the fluid viscosity, S E is the internal heat source, K is the thermal conductivity, h hot is the total enthalpy, Work done for viscous force, T is temperature; the heat transfer equation involved in the heat-flow coupling is: wherein K s 、K f is the heat conductivity of solid and fluid respectively, Is the Laplacian of temperature T, Q is thermal power, ρ is fluid density, C p is fluid constant pressure specific heat capacity, Is a convection term.
8. The method for analyzing service performance of the spline pair of the high-temperature valve of the hydrogen-based shaft furnace based on the flow-heat-solid coupling according to claim 7 is characterized in that in the step 5, the thermal deformation and stress field of the spline pair are solved by a finite element method based on a temperature field combined temperature-stress coupling equation, and the method is specifically as follows: Step 501, defining model material properties, connecting a fluid-static structure module, conducting temperature data, and carrying out steady-state thermal stress analysis; step 502, establishing a spline pair tooth surface contact pair, closing a small sliding state, opening a large deflection state, processing a contact interface, detecting an initial contact state, and ensuring that the contact interface meets the actual working condition of a model; Step 503, loading a steady-state temperature field obtained by heat-flow coupling calculation as a heat load to each solid calculation domain, setting load acting time, and applying corresponding load boundary conditions; Step 504, adopting a nonlinear control solving model, wherein the nonlinear control solving model comprises two load steps, the first load step only plays a role of mechanical load, and the second load step plays a role of activating temperature load to realize mechanical load-temperature load coupling; And 505, combining a temperature-stress coupling equation, and iteratively solving thermal deformation, equivalent stress, tooth flank clearance and fatigue life distribution until convergence is completed.
9. The method for analyzing service performance of the spline pair of the high-temperature valve of the hydrogen-based shaft furnace based on flow-heat-solid coupling according to claim 8, wherein the temperature-stress coupling equation is as follows: where, μ is the node displacement vector, For the node velocity vector, K is the stiffness matrix, F is the force vector, and Q is the force comprising the applied node force and the thermal deformation induced force.
10. The method for analyzing the service performance of the high-temperature valve spline pair based on the flow-heat-solid coupling, which is characterized in that in the step 6, the service performance parameters of the high-temperature valve spline pair are analyzed based on a temperature field, thermal deformation and a stress field, and the service performance of the high-temperature valve spline pair is estimated, specifically: step 601, performing grid independence test to determine the size and the number of the optimal grid cells; step 602, carrying out deformation behavior analysis of a rotating shaft, solving the overall deformation and X, Y, Z-direction deformation of the rotating shaft, and judging whether the spline pair meets the service requirement; step 603, analyzing the tooth side gap of the spline pair, solving the change condition of the tooth surface contact state of the spline pair under the action of thermal stress, and judging the change trend of the tooth side gap and whether the change trend meets the service requirement; Step 604, carrying out the analysis of the tooth surface strength of the rotating shaft, solving the equivalent stress of the tooth surface, analyzing the stress distribution condition of the tooth surface and judging whether the maximum equivalent stress meets the service requirement; and 605, calculating the fatigue life of the tooth surface of the rotating shaft of the spline pair by adopting a nominal stress method and predicting the average life of the spline pair under the random load by combining with the Miner linear accumulated damage theory.

Description

Flow-heat-solid coupling-based hydrogen-based shaft furnace high-temperature valve spline pair service performance analysis method Technical Field The invention relates to the technical field of hydrogen metallurgy, in particular to a service performance analysis method of a spline pair of a high-temperature valve of a hydrogen-based shaft furnace based on flow-heat-solid coupling. Background The hydrogen-based reduction ironmaking and electric furnace steelmaking have the advantages of short flow, low carbon emission and the like, and are regarded as the core direction of green transformation in the steel industry. The high temperature valve is a key component for continuously and stably conveying directly reduced iron particles generated by hydrogen-based reduction iron making to an electric furnace for steelmaking. In the actual operation process, the high-temperature valve spline pair contacted with the direct reduced iron particles bears the action of thermal coupling load for a long time, firstly, the heat held by the particles after reduction acts on the thermal load of the spline pair through heat conduction, and secondly, the motor torque and the mechanical load acted on the spline pair under the impact of the particles. The spline pair is caused to show a certain deformation behavior, and the tooth surface contact state is possibly caused to be suddenly changed, so that the working strength of the tooth surface is influenced, the fatigue accumulation damage is further aggravated, the operation safety of the high-temperature valve is seriously threatened, and the stable operation of the process is further restricted. The related researches of the existing hydrogen-based reduction ironmaking and electric furnace steelmaking process are mainly focused on analyzing and optimizing the technological parameters of the process, but not on the service performance of the core component of the process, and the researches on spline pairs are mainly focused on fretting wear researches, but not on the service performance under high temperature conditions. Therefore, it is currently difficult to accurately evaluate whether the service performance of the spline pair of the high temperature valve of the hydrogen-based shaft furnace meets the requirements. In order to solve the problems, a method for analyzing the service performance of the spline pair of the high-temperature valve of the hydrogen-based shaft furnace based on flow-heat-solid coupling is needed, the problems of the traditional method are solved, and the pneumatic conveying flow is balanced automatically. Disclosure of Invention The invention aims to provide a flow-heat-solid coupling-based method for analyzing service performance of a spline pair of a high-temperature valve of a hydrogen-based shaft furnace, which can meet the requirements of rapid and accurate analysis of service performance of the high-temperature valve of the hydrogen-based shaft furnace and rapid iterative verification of parameter optimization, has strong universality and has wide application prospect under the background of gradual popularization of a hydrogen-based reduction iron-making process. In order to achieve the above purpose, the technical scheme adopted by the invention is as follows: A method for analyzing service performance of a high-temperature valve spline pair of a hydrogen-based shaft furnace based on flow-heat-solid coupling comprises the following steps: Step 1, obtaining design parameters of a spline pair of a high-temperature valve of a hydrogen-based shaft furnace, establishing a three-dimensional model based on the design parameters, and establishing a fluid calculation domain and a solid calculation domain of the three-dimensional model; step 2, performing attribute and parameterized grid division on the fluid computing domain and the solid computing domain to generate a structured network of the whole three-dimensional model and an encryption network of a key area; step 3, constructing a steady-state simulation model and a reduced iron particle and a motion model thereof based on a fluid calculation domain and a solid calculation domain; step 4, carrying out heat-flow coupling simulation and solving a temperature field of a steady-state simulation model; step 5, solving thermal deformation and stress fields of the spline pair by a finite element method based on a temperature field combined temperature-stress coupling equation; And 6, analyzing service performance parameters of the high-temperature valve spline pair based on the temperature field, the thermal deformation and the stress field, and evaluating the service performance of the high-temperature valve spline pair. Further, in step 1, a three-dimensional model is built based on design parameters, and a fluid calculation domain and a solid calculation domain of the three-dimensional model are built, specifically: Step 101, drawing a tooth surface involute in three-dimensional modeling software ba