阅读说明：本技术 一种基于计算机仿真的高炉数字化系统实现方法 (Blast furnace digital system implementation method based on computer simulation ) 是由 李朝阳 王成镇 栾吉益 曾晖 周平 何毅 刘成宝 许荣昌 于 2020-05-12 设计创作，主要内容包括：本发明提供一种基于计算机仿真的高炉数字化系统实现方法,包括如下步骤：将高炉几何体在空间上进行划分,并设定边界条件和界面作为划分的各部分之间的初始化条件,其中,高炉几何体在空间划分的部分包括炉顶、本体、回旋区和炉缸；然后对高炉不同部分进行仿真模拟,再进行耦合集成为可描述整个高炉炼铁的数字化系统,解决了全高炉炼铁过程难以通过数字化手段进行描述、难以可视化问题,实现了从控制的角度对高炉进行建模。(The invention provides a blast furnace digitization system implementation method based on computer simulation, which comprises the following steps: the method comprises the following steps of dividing a blast furnace geometric body in space, and setting boundary conditions and interfaces as initialization conditions among all the divided parts, wherein the divided parts of the blast furnace geometric body in space comprise a furnace top, a body, a convolution area and a furnace hearth; and then different parts of the blast furnace are simulated and integrated into a digital system capable of describing the whole blast furnace iron making, so that the problems that the whole blast furnace iron making process is difficult to describe and visualize through a digital means are solved, and the blast furnace is modeled from the control perspective.)

1. A blast furnace digital system implementation method based on computer simulation is characterized by comprising the following steps:

step 1: the method comprises the following steps of dividing a blast furnace geometric body in space, and setting boundary conditions and interfaces as initialization conditions among all the divided parts, wherein the divided parts of the blast furnace geometric body in space comprise a furnace top, a body, a convolution area and a furnace hearth;

step 2: aiming at the continuous characteristic of the body, performing simulation on the state in the body of the blast furnace by using a computer simulation method by using a set interface condition and outputting a result;

and step 3: aiming at the discrete characteristics of the furnace top and the convolution region, respectively carrying out simulation on the multiphase flow of the furnace top and the convolution region by a computer simulation method by respectively utilizing partial results generated by the body simulation in the step 2 and outputting the results;

and 4, step 4: aiming at the continuous characteristic of the convolution area, carrying out simulation on the state in the convolution area by using a computer simulation method and outputting a result by using a partial result generated by body simulation in the step 2 and a partial result generated by convolution area simulation in the step 3;

and 5: aiming at the continuous characteristic of the hearth, performing simulation on the state in the blast furnace hearth by using a computer simulation method and utilizing partial results generated by the body simulation in the step 2, and outputting the results;

step 6: and (5) respectively updating the boundary conditions of each part by adopting the partial results of the steps 3, 4 and 5, repeating the simulation of each part according to the updated boundary conditions until the variation degree of the interface between each part of the divided blast furnace along with the iterative calculation is smaller than a set threshold range, and outputting the simulation result.

2. The method for realizing the blast furnace digitization system based on the computer simulation of claim 1, wherein in step 1, the blast furnace geometry comprises a rotating chute, a blast furnace cooling wall and a hearth bottom inner part;

the set boundary conditions comprise information of charging materials added at an inlet of the rotary chute, information of hot air blown from an air port, information of fuel blowing, heat conductivity of a cooling wall, heat conductivity of the bottom of a furnace hearth, environmental temperature and cooling water temperature;

the set interfaces are respectively present on the charge level between the furnace top and the body, the rotating area boundary between the body and the rotating area, and the tap hole between the body and the furnace hearth.

3. The method as claimed in claim 2, wherein the information of the charge material added to the inlet of the rotary chute includes size, temperature, composition, density;

the information of the hot air blown from the tuyere comprises components, temperature, speed and pressure;

the information of the injected fuel includes size, temperature, composition, density.

4. The method for implementing the blast furnace digitization system based on the computer simulation of claim 1, wherein in step 2, the states in the body include multiphase flow, mass and heat transfer, and chemical reactions in the body; wherein the multiphase flow of the body comprises the flow of coal gas, furnace burden and iron slag;

the method of computer simulation is a computational fluid mechanics method.

5. The method for realizing the blast furnace digitization system based on the computer simulation of claim 1, wherein the step 3 specifically comprises:

step 3-1: aiming at the discrete characteristic of the furnace top, simulating and simulating the multiphase flow of the furnace top by using the speed, the temperature, the pressure and the components of the coal gas generated by the body simulation in the step 2 at the charge level of the blast furnace by adopting a coupled computational fluid mechanics method and a discrete unit method, and outputting a result; wherein the multi-phase flow of the furnace top comprises the flow of gas and solid charge;

step 3-2: aiming at the discrete characteristic of the cyclotron region, simulating and simulating the multiphase flow of the cyclotron region by using the size, the temperature, the density and the components of the furnace burden at the boundary of the cyclotron region generated by the body simulation in the step 2 and adopting a coupled computational fluid mechanics method and a discrete unit method, and outputting a result; wherein the multiphase flow of the swirling area comprises the flow of hot air and furnace charge.

6. The method for realizing the blast furnace digitization system based on the computer simulation of claim 1, wherein the step 4 specifically comprises:

aiming at the continuous characteristic of the cyclotron region, simulating and simulating multi-phase flow, mass and heat transfer and chemical reaction in the cyclotron region by using the size and the porosity of furnace charge at the boundary of the cyclotron region and the size, the temperature, the density and the components of the furnace charge at the boundary of the cyclotron region by adopting a computational fluid mechanics method, and outputting a result; wherein the multiphase flow in the convolution zone comprises the flow of gas, hot air, furnace charge and powder injection fuel.

7. The method for realizing the blast furnace digitization system based on the computer simulation of claim 1, wherein the step 5 specifically comprises:

aiming at the continuous characteristic of the hearth, carrying out simulation on multi-phase flow, mass and heat transfer and chemical reaction in the blast furnace hearth by using the temperature, speed, components and density of the iron slag and the coal gas at the taphole generated by the body simulation in the step 2 by adopting a computational fluid mechanics method and outputting a result; wherein the multiphase flow in the hearth comprises the flow of coal gas, a dead coke layer and iron slag.

8. The method for implementing the blast furnace digitization system based on the computer simulation of claim 5, wherein the specific steps of step 6 include:

step 6-1: updating the boundary conditions of the step 2 by adopting partial results of the step 3, the step 4 and the step 5, and performing simulation on the state in the body again by using a computational fluid dynamics method according to the updated boundary conditions;

step 6-2: updating the boundary conditions from the step 3 to the step 5 by adopting the result generated in the step 6-1, and operating the step 3 to the step 5 again in sequence;

step 6-3: and repeating the step 6-1 and the step 6-2 until the change degree of the interfaces among all the parts of the divided blast furnace along with the iterative calculation is smaller than a set threshold range, and outputting a simulation result.

9. The method of claim 8, wherein in step 6-1, the partial results generated in step 3 include temperature, size, composition, density of the charge at the charge level, and size and porosity of the rotor zone boundary;

part of results generated in the step 4 comprise the temperature, the composition, the speed and the pressure of the gas at the boundary of the cyclotron region;

part of the results produced in step 5 include the pressure of the iron slag at the tap hole.

10. The method for realizing the blast furnace digitization system based on the computer simulation of claim 8, wherein the step 6-2 specifically comprises:

updating the boundary conditions in the step 3-1 for the speed, temperature and pressure of the coal gas at the charge level and the components;

updating the boundary conditions in the step 3-2 and the step 4 according to the size, the temperature, the density and the composition of the furnace burden at the boundary of the raceway;

and updating the boundary conditions in the step 5 for the temperature, the speed, the components and the density of the iron slag and the coal gas at the taphole.

Technical Field

The invention relates to the technical field of ferrous metallurgy, in particular to a blast furnace digital system implementation method based on computer simulation.

Background

The blast furnace ironmaking process is quite complex, phenomena of gas (hot air, coal gas), solid (furnace burden), powder (injection fuel), liquid (slag iron) multi-phase flow, mass and heat transfer, chemistry and the like exist, dangerous operation conditions such as high temperature and high pressure are accompanied, and the internal state of the blast furnace cannot be digitally described and visualized by utilizing experiments and measuring means, so that the blast furnace is used as a black box for a long time and is seriously operated by the experience of field workers. In addition, the interior of the blast furnace has great discontinuity in time and space scales, so that the traditional computer simulation method based on a single scale (mainly a macroscopic scale computational fluid mechanics method and a microscopic scale discrete unit method) is difficult to be universally applied to the full blast furnace iron-making process. The blast furnace model developed at present based on computer simulation is established for the local part of the blast furnace, and the digitization and the visualization of the blast furnace iron-making process cannot be realized from the perspective of process control.

At present, the patents 201610110775.3, 201910648452.3, 201710804565.9, 201710804564.4, 201210123530.6, 201710240585.8 and 201610390270.7 cannot realize the description of the internal state of the blast furnace from the control perspective, and cannot realize the digitization and visualization of the internal state of the whole blast furnace.

Therefore, in combination with the above situation, there is a need for a simulation system for steel production, especially blast furnace production, which can realize digitization and visualization of the blast furnace ironmaking process from the aspect of control of the process.

Disclosure of Invention

In order to realize the description of the internal state of the blast furnace from the control perspective and realize the digitization and visualization of the internal state of the whole blast furnace, the invention provides a blast furnace digitization system realization method based on computer simulation.

The technical scheme of the invention is as follows:

the technical scheme of the invention provides a blast furnace digitization system implementation method based on computer simulation, which comprises the following steps:

step 1: the method comprises the following steps of dividing a blast furnace geometric body in space, and setting boundary conditions and interfaces as initialization conditions among all the divided parts, wherein the divided parts of the blast furnace geometric body in space comprise a furnace top, a body, a convolution area and a furnace hearth;

step 2: aiming at the continuous characteristic of the body, performing simulation on the state in the body of the blast furnace by using a computer simulation method by using a set interface condition and outputting a result;

and step 3: aiming at the discrete characteristics of the furnace top and the convolution region, respectively carrying out simulation on the multiphase flow of the furnace top and the convolution region by a computer simulation method by respectively utilizing partial results generated by the body simulation in the step 2 and outputting the results;

and 4, step 4: aiming at the continuous characteristic of the convolution area, carrying out simulation on the state in the convolution area by using a computer simulation method and outputting a result by using a partial result generated by body simulation in the step 2 and a partial result generated by convolution area simulation in the step 3;

and 5: aiming at the continuous characteristic of the hearth, performing simulation on the state in the blast furnace hearth by using a computer simulation method and utilizing partial results generated by the body simulation in the step 2, and outputting the results;

step 6: and (5) respectively updating the boundary conditions of each part by adopting the partial results of the steps 3, 4 and 5, repeating the simulation of each part according to the updated boundary conditions until the variation degree of the interface between each part of the divided blast furnace along with the iterative calculation is smaller than a set threshold range, and outputting the simulation result.

Preferably, in step 1, the blast furnace geometry comprises a rotating chute and a blast furnace cooling wall and an inner portion of a hearth bottom;

the set boundary conditions comprise information of charging materials added at an inlet of the rotary chute, information of hot air blown from an air port, information of fuel blowing, heat conductivity of a cooling wall, heat conductivity of the bottom of a furnace hearth, environmental temperature and cooling water temperature;

the set interfaces are respectively present on the charge level between the furnace top and the body, the rotating area boundary between the body and the rotating area, and the tap hole between the body and the furnace hearth.

Preferably, the information of the charge material fed to the inlet of the rotary chute comprises size, temperature, composition, density;

the information of the hot air blown from the tuyere comprises components, temperature, speed and pressure;

the information of the injected fuel includes size, temperature, composition, density.

Preferably, in step 2, the state in the body comprises multiphase flow, mass and heat transfer and chemical reaction in the body; wherein the multiphase flow of the body comprises the flow of coal gas, furnace burden and iron slag;

the method of computer simulation is a computational fluid mechanics method.

Preferably, step 3 specifically includes:

step 3-1: aiming at the discrete characteristic of the furnace top, carrying out simulation on the multiphase flow of the furnace top by using the speed, the temperature, the pressure and the components of the coal gas generated by the body simulation in the step 2 at the blast furnace charge level by adopting a coupled computational fluid mechanics method and a discrete unit method, and outputting a result; wherein the multi-phase flow of the furnace top comprises the flow of gas and solid charge;

step 3-2: aiming at the discrete characteristic of the cyclotron region, simulating and simulating the multiphase flow of the cyclotron region by using the size, the temperature, the density and the components of the furnace burden at the boundary of the cyclotron region generated by the body simulation in the step 2 and adopting a coupled computational fluid mechanics method and a discrete unit method, and outputting a result; wherein the multiphase flow of the swirling area comprises the flow of hot air and furnace charge.

Preferably, step 4 specifically includes:

aiming at the continuous characteristic of the cyclotron region, simulating and simulating multi-phase flow, mass and heat transfer and chemical reaction in the cyclotron region by using the size and the porosity of furnace charge at the boundary of the cyclotron region and the size, the temperature, the density and the components of the furnace charge at the boundary of the cyclotron region by adopting a computational fluid mechanics method, and outputting a result; wherein the multiphase flow in the convolution zone comprises the flow of gas, hot air, furnace charge and powder injection fuel.

Preferably, step 5 specifically includes:

aiming at the continuous characteristic of the hearth, carrying out simulation on multi-phase flow, mass and heat transfer and chemical reaction in the blast furnace hearth by using the temperature, speed, components and density of the iron slag and the coal gas at the taphole generated by the body simulation in the step 2 by adopting a computational fluid mechanics method and outputting a result; wherein the multiphase flow in the hearth comprises the flow of coal gas, a dead coke layer and iron slag.

Preferably, the specific steps of step 6 include:

step 6-1: updating the boundary conditions of the step 2 by adopting partial results of the step 3, the step 4 and the step 5, and performing simulation on the state in the body again by using a computational fluid dynamics method according to the updated boundary conditions;

step 6-2: updating the boundary conditions from the step 3 to the step 5 by adopting the result generated in the step 6-1, and operating the step 3 to the step 5 again in sequence;

step 6-3: and repeating the step 6-1 and the step 6-2 until the change degree of the interfaces among all the parts of the divided blast furnace along with the iterative calculation is smaller than a set threshold range, and outputting a simulation result.

Preferably, in step 6-1, part of the results produced in step 3 include the temperature, size, composition, density of the charge at the charge level and the size, porosity of the raceway boundary;

part of results generated in the step 4 comprise the temperature, the composition, the speed and the pressure of the gas at the boundary of the cyclotron region;

part of the results produced in step 5 include the pressure of the iron slag at the tap hole.

Preferably, step 6-2 specifically comprises:

updating the boundary conditions in the step 3-1 for the speed, temperature and pressure of the coal gas at the charge level and the components;

updating the boundary conditions in the step 3-2 and the step 4 according to the size, the temperature, the density and the composition of the furnace burden at the boundary of the raceway; and updating the boundary conditions in the step 5 for the temperature, the speed, the components and the density of the iron slag and the coal gas at the taphole.

According to the technical scheme, the invention has the following advantages: the blast furnace geometric solid is scientifically and reasonably divided, simulation is carried out on each part of the blast furnace pertinently by adopting a multi-scale means, and then the simulation is integrated into a digital system capable of describing the whole blast furnace ironmaking, so that the problem that the whole blast furnace ironmaking process is difficult to be described and visualized in a near digital mode from the process control angle is solved.

In addition, the invention has reliable design principle, simple structure and very wide application prospect.

Therefore, compared with the prior art, the invention has prominent substantive features and remarkable progress, and the beneficial effects of the implementation are also obvious.

Drawings

In order to more clearly illustrate the embodiments or technical solutions in the prior art of the present invention, the drawings used in the description of the embodiments or prior art will be briefly described below, and it is obvious for those skilled in the art that other drawings can be obtained based on these drawings without creative efforts.

FIG. 1 is a schematic view of a blast furnace provided by an embodiment of the present invention;

fig. 2 is a schematic view of a furnace roof provided by an embodiment of the present invention;

FIG. 3 is a schematic diagram of an ontology provided by an embodiment of the present invention;

FIG. 4 is a schematic view of a convolution region provided in an embodiment of the present invention;

FIG. 5 is a schematic view of a crucible provided by an embodiment of the present invention;

wherein, 1-blast furnace, 2-furnace top, 3-body, 4-convolution zone, 5-hearth, 6-rotary chute, 7-charge level, 8-lining, 9-convolution zone boundary, 10-taphole, 11-furnace charge, 12-coal gas, 13-soft melting zone, 14-iron slag, 15-hot air, 16-injection fuel, 17-dead coke layer, 18-tuyere and 19-rotary chute inlet.

Detailed Description

In order to make those skilled in the art better understand the technical solution of the present invention, the technical solution in the embodiment of the present invention will be clearly and completely described below with reference to the drawings in the embodiment of the present invention, and it is obvious that the described embodiment is only a part of the embodiment of the present invention, and not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.