Numerical simulation method for heat treatment furnace

Abstract

The invention belongs to the technical field of numerical simulation, and discloses a thermal treatment furnace numerical simulation method which comprises the following steps: performing analogue simulation on a real thermal treatment furnace to obtain a thermal treatment furnace model, and performing simplification treatment on the thermal treatment furnace model to obtain a simplified thermal treatment furnace model; the combustion reflection process of the simplified heat treatment furnace model is simulated, numerical simulation is carried out by coupling multiple heat exchange forms in the furnace and in the surrounding environment, simulation data are obtained, and the simulation data comprise in-furnace temperature field data and flow field distribution data; and carrying out in-furnace temperature field and flow field distribution test experiments on the real heat treatment furnace to obtain experiment data, comparing the experiment data of the preset experiment temperature measurement point with simulation data under the same condition, if the experiment data are different from the simulation data under the same condition, carrying out simulation again, and if the simulation data are the same, ending the simulation. According to the technical scheme, multiple heat exchange methods are comprehensively considered, and the method is closer to the real situation.

Description

Technical Field

[0001] The invention belongs to the technical field of numerical simulation, and in particular relates to a numerical simulation method for a heat treatment furnace. Background Art

[0002] Numerical simulation techniques, such as finite element analysis (FEM) and computational fluid dynamics (CFD), are widely used to study complex processes such as heat transfer, radiation heat transfer, and turbulent combustion. Temperature field analysis of heating furnaces based on multi-physics coupled numerical models (e.g., fluid dynamics and radiation heat conduction) has become mainstream. However, existing technologies still have significant limitations in simulating real-world conditions, making it difficult to accurately and comprehensively approximate complex operating conditions. Summary of the Invention

[0003] The purpose of the present invention is to provide a numerical simulation method for a heat treatment furnace to solve the problems existing in the above-mentioned prior art.

[0004] To achieve the above object, the present invention provides a heat treatment furnace numerical simulation method, comprising:

[0005] S1: simulate the real heat treatment furnace to obtain a heat treatment furnace model, and simplify the heat treatment furnace model to obtain a simplified heat treatment furnace model;

[0006] S2: Simulating the combustion reaction process of the simplified heat treatment furnace model, and numerically simulating various heat exchange forms in the furnace and the surrounding environment to obtain simulation data, including temperature field data and flow field distribution data in the furnace;

[0007] S3: Conduct temperature field and flow field distribution test experiments on the real heat treatment furnace to obtain experimental data. Compare the experimental data of the preset experimental temperature measurement points with the simulation data under the same conditions. If they are different, return to step S2. If they are the same, end the simulation.

[0008] Optionally, the simplification of the heat treatment furnace model specifically includes:

[0009] The insulation material structure outside the heat treatment furnace structure is removed, and the structure and surrounding environment inside the furnace body involved in heat exchange are retained.

[0010] Optionally, simulating the combustion reaction process of the simplified heat treatment furnace model specifically includes:

[0011] The combustion reaction process of the simplified heat treatment furnace model is simulated based on the EDM finite reaction model, and the gas entry conditions and the mixing and combustion process of the gas in the heat treatment furnace are taken into consideration.

[0012] Optionally, the numerical simulation of various heat exchange forms in the coupling furnace and the surrounding environment may include:

[0013] Considering various heat transfer forms in the furnace and its surrounding environment, numerical simulation analysis of the temperature field and flow field distribution in the furnace is carried out based on the standard k-ε turbulence model and implicit coupling.

[0014] Optionally, the heat exchange forms include the convection heat exchange process of the flue gas in the furnace, the convection heat exchange between the flue gas in the furnace and the surrounding environment, the heat conduction process of the furnace wall, the heat conduction process of the remaining structures in the furnace, the radiation heat exchange process of the flue gas and the radiation heat exchange process of the furnace wall.

[0015] The technical effects of the present invention are:

[0016] The present invention simulates and analyzes medium- and low-temperature heat treatment furnaces used in industrial processing scenarios, coupling multiple heat exchange processes, including the fuel combustion process, the convection heat transfer process of the flue gas in the furnace body, the heat conduction process of the furnace wall, and the radiation heat transfer process in the furnace body. The present invention comprehensively considers multiple heat exchange methods and is closer to the actual situation. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0018] The accompanying drawings, which constitute part of this application, are intended to provide a further understanding of this application. The exemplary embodiments and descriptions of this application are intended to explain this application and do not constitute an improper limitation on this application. In the accompanying drawings:

[0019] Figure 1 This is an overall flow chart of numerical simulation analysis in an embodiment of the present invention;

[0020] Figure 2 Schematic diagram of the simulation and experimental temperature values ​​of the temperature measurement points in an embodiment of the present invention;

[0021] Figure 3 Schematic diagram of temperature field analysis in and around a furnace in an embodiment of the present invention;

[0022] Figure 4 Schematic diagram of air temperature analysis in a furnace according to an embodiment of the present invention;

[0023] Figure 5 Schematic diagram of analysis of the air field in and around the furnace in an embodiment of the present invention;

[0024] Figure 6Schematic diagram of the air field analysis in the furnace according to an embodiment of the present invention. DETAILED DESCRIPTION

[0025] Various exemplary embodiments of the present invention will now be described in detail. This detailed description should not be considered as limiting the present invention, but rather as a more detailed description of certain aspects, features, and embodiments of the present invention.

[0026] It should be understood that the terms described herein are intended only to describe particular embodiments and are not intended to limit the present invention. In addition, for numerical ranges herein, it should be understood that each intermediate value between the upper and lower limits of the range is also specifically disclosed. Each smaller range between any intermediate value within a stated value or stated range and any other stated value or intermediate value within the stated range is also encompassed by the present invention. The upper and lower limits of these smaller ranges may be independently included or excluded within the scope.

[0027] It will be apparent to those skilled in the art that various modifications and variations may be made to the specific embodiments of the present invention without departing from the scope or spirit of the invention. Other embodiments will be apparent to those skilled in the art from the present invention. The present description and examples are intended to be illustrative only.

[0028] The words “include,” “including,” “have,” “contain,” etc. used in this article are open-ended terms, meaning including but not limited to.

[0029] It should be noted that, in the absence of conflict, the embodiments and features of the embodiments in this application can be combined with each other. The present application will be described in detail below with reference to the accompanying drawings and in combination with the embodiments.

[0030] like Figure 1 - Figure 2 As shown, this embodiment provides a numerical simulation method for a heat treatment furnace, including:

[0031] S1: simulate the real heat treatment furnace to obtain a heat treatment furnace model, and simplify the heat treatment furnace model to obtain a simplified heat treatment furnace model;

[0032] S2: Simulating the combustion reaction process of the simplified heat treatment furnace model, and numerically simulating various heat exchange forms in the furnace and the surrounding environment to obtain simulation data, including temperature field data and flow field distribution data in the furnace;

[0033] S3: Conduct temperature field and flow field distribution test experiments on the real heat treatment furnace to obtain experimental data. Compare the experimental data of the preset experimental temperature measurement points with the simulation data under the same conditions. If they are different, return to step S2. If they are the same, end the simulation.

[0034] The control of the uniformity of the temperature field in the heat treatment furnace is the key to affecting the entire heat treatment process. Since changes in the structure of the heat treatment furnace will cause changes in the entire temperature distribution in the furnace and affect the utilization efficiency of the gas, it will further affect the quality of the heat-treated workpiece and the economy of the heat treatment process. The design of the traditional heating furnace structure is based on experience. The improvement of the temperature uniformity in the furnace can only be carried out by adjusting the structure on the basis of practical experience. It is impossible to systematically obtain the law of the influence of the structure on the temperature in the furnace. There is no reliable theoretical guidance for the design process of the heating furnace structure, and it is impossible to obtain the temperature field and flow field distribution in the furnace. This embodiment proposes a finite element analysis method that couples multiple heat exchange processes to obtain the temperature field and flow field distribution in the furnace, providing theoretical guidance for the design of the heating furnace structure.

[0035] The implementation process of this embodiment includes:

[0036] A simulation model of a heat treatment furnace was constructed and simplified, removing the external insulation and structural components that only enhance the furnace's performance. Only the internal heat exchange components and the surrounding environment were retained. The combustion reaction process was simulated and analyzed based on the EDM finite reaction model, taking into account the gas inlet conditions, mixing within the furnace, and combustion processes. Furthermore, various heat transfer processes within the furnace and between the furnace and the surrounding environment were considered, including convection heat transfer within the furnace, convection heat transfer between the flue gas within the furnace and the surrounding environment, conduction heat transfer through the furnace walls, conduction heat transfer through other furnace structures, radiation heat transfer through the flue gas, and radiation heat transfer through the furnace walls. The convection heat transfer model employed the standard k-ε turbulence model with implicit coupling to numerically simulate the temperature and flow fields within the furnace. The selection of numerical simulation methods is shown in Table 1, resulting in the distribution of the temperature and flow fields within the furnace.

[0037] Table 1 Selection of numerical simulation methods

[0038]

[0039] On the basis of numerical calculation, the real furnace structure is experimentally studied, and the temperature value of the experimental temperature measurement point is compared with the simulation data under the same conditions to verify the correctness of the simulation results. Among them, the experiment records multiple measurement data and takes the average temperature within a period of time in the stable temperature area. The overall flow chart is as follows Figure 1 shown.

[0040] The temperature values ​​of each temperature measurement point were compared with the results of numerical simulation at the same location, as shown in Table 2. The maximum error is 27%. Considering the simplification of the structure and simulation conditions, the error is within the allowable range. Figure 2 shown.

[0041] Table 2 Comparison of experimental average temperature and simulation results

[0042]

[0043] A simulation analysis of an industrial heat treatment furnace was conducted, and experimental research was conducted to verify the reliability of the simulation results. The experimental verification shows that the numerical simulation model established in this embodiment has a certain degree of reliability, and the temperature field and flow field distribution in the furnace are obtained, providing guidance for the design of heat treatment furnace structures.

[0044] In summary, this embodiment simulates and analyzes a medium- and low-temperature heat treatment furnace for industrial processing scenarios, coupling multiple heat exchange processes, including the fuel combustion process, the convection heat transfer process of the flue gas in the furnace body, the heat conduction process of the furnace wall, and the radiation heat transfer process in the furnace body. This embodiment comprehensively considers multiple heat exchange methods and is closer to the actual situation.

[0045] The above description is merely a preferred embodiment of the present application, but the scope of protection of the present application is not limited thereto. Any changes or substitutions that can be easily conceived by a person skilled in the art within the technical scope disclosed in the present application should be included in the scope of protection of the present application. Therefore, the scope of protection of the present application should be based on the scope of protection of the claims.

Claims

1. A numerical simulation method for a heat treatment furnace, characterized in that: include: S1: simulate the real heat treatment furnace to obtain a heat treatment furnace model, and simplify the heat treatment furnace model to obtain a simplified heat treatment furnace model; S2: Simulating the combustion reaction process of the simplified heat treatment furnace model, and numerically simulating various heat exchange forms in the furnace and the surrounding environment to obtain simulation data, including temperature field data and flow field distribution data in the furnace; S3: Conduct temperature field and flow field distribution test experiments on the real heat treatment furnace to obtain experimental data. Compare the experimental data of the preset experimental temperature measurement points with the simulation data under the same conditions. If they are different, return to step S2. If they are the same, end the simulation.

2. The method according to claim 1, characterized in that The simplification of the heat treatment furnace model specifically includes: The insulation material structure outside the heat treatment furnace structure is removed, and the structure and surrounding environment inside the furnace body involved in heat exchange are retained.

3. The method according to claim 1, characterized in that The simulation of the combustion reaction process of the simplified heat treatment furnace model specifically includes: The combustion reaction process of the simplified heat treatment furnace model is simulated based on the EDM finite reaction model, and the gas entry conditions and the mixing and combustion process of the gas in the heat treatment furnace are taken into consideration.

4. The method according to claim 1, wherein Numerical simulation of various heat exchange forms in the coupling furnace and the surrounding environment is carried out, specifically including: Considering various heat transfer forms in the furnace and its surrounding environment, numerical simulation analysis of the temperature field and flow field distribution in the furnace is carried out based on the standard k-ε turbulence model and implicit coupling.

5. The method according to claim 1, characterized in that The heat exchange forms include the convection heat exchange process of the flue gas in the furnace, the convection heat exchange between the flue gas in the furnace and the surrounding environment, the heat conduction process of the furnace wall, the heat conduction process of the other structures in the furnace, the radiation heat exchange process of the flue gas and the radiation heat exchange process of the inner wall of the furnace.

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