CN111400934B - Method for simulating oxygen content distribution of low-temperature carbonization furnace based on WORKBENCH - Google Patents
Method for simulating oxygen content distribution of low-temperature carbonization furnace based on WORKBENCH Download PDFInfo
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- 238000003763 carbonization Methods 0.000 title claims abstract description 38
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 title claims abstract description 28
- 239000001301 oxygen Substances 0.000 title claims abstract description 28
- 229910052760 oxygen Inorganic materials 0.000 title claims abstract description 28
- 238000000034 method Methods 0.000 title claims abstract description 24
- 238000009826 distribution Methods 0.000 title claims abstract description 22
- 238000004088 simulation Methods 0.000 claims abstract description 46
- 238000001514 detection method Methods 0.000 claims abstract description 35
- 238000004364 calculation method Methods 0.000 claims abstract description 23
- 238000013461 design Methods 0.000 claims abstract description 20
- 238000007789 sealing Methods 0.000 claims abstract description 15
- 238000011960 computer-aided design Methods 0.000 claims abstract description 10
- 238000005338 heat storage Methods 0.000 claims abstract description 10
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 claims description 27
- 229910052757 nitrogen Inorganic materials 0.000 claims description 15
- 239000012530 fluid Substances 0.000 claims description 11
- 230000003068 static effect Effects 0.000 claims description 7
- 230000000694 effects Effects 0.000 claims description 6
- 238000012546 transfer Methods 0.000 claims description 6
- 238000010438 heat treatment Methods 0.000 claims description 5
- 238000009413 insulation Methods 0.000 claims description 4
- 238000004458 analytical method Methods 0.000 claims description 3
- 230000005484 gravity Effects 0.000 claims description 3
- 239000000463 material Substances 0.000 claims description 3
- QJGQUHMNIGDVPM-UHFFFAOYSA-N nitrogen group Chemical group [N] QJGQUHMNIGDVPM-UHFFFAOYSA-N 0.000 claims description 3
- 239000002245 particle Substances 0.000 claims description 3
- 230000001052 transient effect Effects 0.000 claims description 3
- 238000012360 testing method Methods 0.000 abstract description 5
- 229920000049 Carbon (fiber) Polymers 0.000 description 15
- 239000004917 carbon fiber Substances 0.000 description 15
- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical compound C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 description 10
- 238000004519 manufacturing process Methods 0.000 description 7
- 229910001220 stainless steel Inorganic materials 0.000 description 6
- 239000010935 stainless steel Substances 0.000 description 6
- 238000011161 development Methods 0.000 description 4
- 238000010586 diagram Methods 0.000 description 4
- 239000007789 gas Substances 0.000 description 4
- 238000007380 fibre production Methods 0.000 description 3
- 238000005265 energy consumption Methods 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 238000012544 monitoring process Methods 0.000 description 2
- 238000011160 research Methods 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000007796 conventional method Methods 0.000 description 1
- 239000000498 cooling water Substances 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000012938 design process Methods 0.000 description 1
- 238000007599 discharging Methods 0.000 description 1
- 230000008676 import Effects 0.000 description 1
- 239000012774 insulation material Substances 0.000 description 1
- 230000004807 localization Effects 0.000 description 1
- 230000003647 oxidation Effects 0.000 description 1
- 238000007254 oxidation reaction Methods 0.000 description 1
- 238000004321 preservation Methods 0.000 description 1
- 230000002265 prevention Effects 0.000 description 1
- 238000012827 research and development Methods 0.000 description 1
- 238000009423 ventilation Methods 0.000 description 1
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Abstract
A simulation method for oxygen content distribution of a low-temperature carbonization furnace based on WORKBENCH relates to the technical field of oxygen content distribution testing in the design stage of the low-temperature carbonization furnace. The technical problem of the prior art existing in the design stage of the low-temperature carbonization furnace is solved, and the method comprises the following steps: s1, establishing a three-dimensional simulation model of a muffle cavity and an inlet and outlet sealing cavity of a low-temperature carbonization furnace by adopting a CAD (computer aided Design) software Design Modeler module in WORKBENCH software; s2, carrying out grid division on the three-dimensional simulation model; s3, transmitting the data to a CFX calculation module of the WORKBENCH software, and setting parameters in the CFX calculation module; s4, setting a detection point and a detection surface, and performing simulation operation to obtain a simulation result which is used as an index for designing a muffle cavity structure and an inlet and outlet sealing structure of the low-temperature carbonization furnace; and S5, repeating the steps S1 to S4 according to different parameters so as to determine the optimal hearth heat storage capacity and airflow distribution design. The structural design can be better measured, the design cost is reduced, and reference is provided for the design of the low-temperature carbonization furnace.
Description
Technical Field
The invention relates to the technical field of oxygen content distribution testing in the design stage of a low-temperature carbonization furnace.
Background
In the production process of carbon fiber, a low-temperature carbonization furnace is one of key devices, and the low-temperature carbonization furnace generally refers to 300 ℃ to 1000 ℃ relative to a high-temperature carbonization furnace, and mainly comprises a frame body (furnace shell), a heat insulation material, a stainless steel muffle, a muffle counterweight device, a heating element, a sensing element, an inlet nitrogen seal, an outlet cooling water tank, an outlet nitrogen seal, a muffle internal gas detection device, a high-purity nitrogen pipeline system, an electric appliance temperature control system and other systems. The stainless steel muffle is a key part of the low-temperature carbonization furnace, and is heated to be greatly deformed when working in a high-temperature environment of 300-1000 ℃ for a long time, and the performance and the service life of the low-temperature carbonization furnace are greatly influenced by the air tightness, the service life, the deformation, the local stress and the like of the stainless steel muffle due to the temperature difference stress and the deformation of the stainless steel muffle at different temperatures. In addition, the temperature uniformity and the temperature difference in the stainless steel muffle have great influence on the quality and the stability of the final carbon fiber. Discussed and analyzed, it was judged that the main causes of the above disadvantages may be the structure, deformation, exhaust port position and sectional area of the stainless steel muffle of the low temperature carbonization furnace are insufficient and the temperature uniformity inside. Through development and development in the last forty years, although products with the level similar to that of foreign T300 are prepared from carbon fibers in China, the annual yield and the product performance of the carbon fibers still cannot meet the requirements of domestic markets for the products. Compared with the international advanced carbon fiber product technical level, the main problems of the domestic carbon fiber are obviously reflected in the poor uniformity and stability of the carbon fiber, and the main reasons are that the carbon fiber process is limited abroad, and the other important influencing factor is that the main production equipment in the carbon fiber production process lags behind abroad. The current situation is that the developed countries abroad represented by the united states and japan monopolize the equipment production technology of high-performance carbon fibers, and attach great importance to the outflow of prevention technology, and compared with the relatively laggard development of China in the field of carbon fiber research and development, the industrialization is slow, the current enterprise production is mainly simulated, the key equipment for import is the main method for solving the equipment problem, especially the key equipment for carbonization of a production line with high capacity, such as an oxidation furnace, a carbonization furnace and the like, for a kiloton-grade carbon fiber production line, and the united states forbids equipment for export to China. If the current passive situation needs to be changed and the industrial safety threat needs to be broken, the autonomous development of the localization and industrialization of the carbon fiber production line equipment needs to be solved urgently, and professional researchers related to carbon fibers need to continuously improve and research. Therefore, a reasonable design method needs to be selected, the furnace wall can reach the surface temperature meeting the specification, and the reduction of unit energy consumption is the technical problem in the prior art.
Disclosure of Invention
In summary, the present invention is directed to solve the technical problem existing in the design stage of the low temperature carbonization furnace in the prior art, and to provide a simulation method for oxygen content distribution in the low temperature carbonization furnace based on work beam.
In order to solve the technical problems provided by the invention, the technical scheme is as follows:
the method for simulating the oxygen content distribution of the low-temperature carbonization furnace based on the WORKBENCH is characterized by comprising the following steps of:
s1, establishing a three-dimensional simulation model of a muffle cavity of the low-temperature carbonization furnace and an inlet and outlet sealing cavity by adopting a Design Modler module of CAD (computer aided Design) software in WORKBENCH (computer aided Design) software, and setting geometric parameters of the three-dimensional simulation model;
s2, transmitting the three-dimensional simulation models of the muffle cavity and the inlet and outlet sealing cavity of the carbonization furnace established in the step S1 to a Mesh division Mesh module, and carrying out Mesh division on the three-dimensional simulation models in the Mesh module by adopting a Sweep mode;
s3, transmitting the three-dimensional simulation model subjected to grid division in the step S2 to a CFX (computational fluid dynamics) calculation module of the WORKBENCH software, and setting parameters in the CFX calculation module;
s4, setting a detection point and a detection surface in a CFX calculation module in the WORKBENCH software, and performing simulation operation to obtain a simulation result which is used as an index for designing a muffle cavity structure and an inlet and outlet sealing structure of the low-temperature carbonization furnace;
and S5, under the same geometric parameter setting condition, setting different parameters of the three-dimensional simulation model and repeating the steps S1 to S4 to perform multiple times of simulation calculation, wherein the temperature change curve of the indoor detection point, the temperature cloud chart of the detection surface and the airflow speed cloud chart of the detection surface are used as indexes for evaluating the heating effect and the airflow distribution characteristic of the hearth, so that the optimized hearth heat storage capacity and airflow distribution design are determined.
The technical scheme for further limiting the invention comprises the following steps:
the geometric parameters set in step S1 at least include: the geometric shape and the geometric dimension of the muffle cavity, the geometric shape and the geometric dimension of the inlet and the outlet seal, the inlet dimension of the inlet and the outlet seal nitrogen pipe and the outlet dimension of the nitrogen pipe.
In step (3), the process of setting parameters in the CFX calculation module is as follows:
(3.1) importing a custom temperature parameter compiled according to the process parameter in an Expression option;
(3.2) in the Buoyancy option, setting the Y-direction Gravity Y Dirn as a preset value according to requirements, and setting the Analysis Type option as Transient calculation;
(3.3) setting Heat Transfer in the Fluid Models option as Thermal Energy, and selecting a k-epsilon model in the Turbulence option;
(3.4) selecting air and nitrogen in the Material Library option section;
(3.5) in the Fluid and particle Definitions option, the Fluid1 part is nitrogen and the Fluid2 part is oxygen;
(3.6) setting an inlet Boundary condition as Static Pressure in the Boundary option, setting a Heat Transfer option as a preset value according to actual requirements, setting an outlet Boundary condition as Average Static Pressure, setting each calculation domain as Interface for data exchange, setting walls as convection Heat exchange surfaces, defining the comprehensive temperature value of furnace wall air in each hour by using Expression, setting the convection Heat exchange coefficient as a preset value according to actual requirements, and setting other walls as Heat insulation smooth walls;
and (3.7) selecting the Define Run and then calculating.
In the step S4, the central point of the three-dimensional simulation model in the muffle furnace is selected as a detection point, and the detection surface is an X-direction plane passing through the central point.
In step S4, the simulation result includes: the temperature change curve of the detection point, the speed cloud picture of the detection surface and the temperature cloud picture of the detection surface.
Compared with the prior art, the invention has the beneficial effects that:
(1) Regarding the problem of oxygen content distribution of the low-temperature carbonization furnace, the conventional method is generally to perform single sensor test, and the invention judges the heat storage capacity of the hearth by utilizing the temperature change curve of a monitoring point, the temperature cloud chart and the speed cloud chart of a detection surface, so that the structural design can be better measured.
(2) By a numerical simulation method, a relation model of factors such as a muffle furnace model, fluid parameters and different oxygen contents and macroscopic properties is established, and the influence of the oxygen contents, different heating temperature regions and different flow speeds on the thermal environment in the muffle furnace is theoretically predicted, so that the design cost can be reduced.
(3) The method can obtain the distribution rule of the heat storage capacity in the muffle furnace, the temperature and the speed in the hearth under different flow speeds and different oxygen contents at different time periods, thereby providing reference for the design of the low-temperature carbonization furnace.
Drawings
FIG. 1 is a schematic diagram of a three-dimensional model established in the simulation method of the present invention.
FIG. 2 is a schematic diagram of temperature clouds of monitoring surfaces with different oxygen contents according to the invention.
FIG. 3 is a schematic diagram of an oxygen content cloud of a test surface for different oxygen contents according to the present invention.
Detailed Description
The method of the present invention is further described below with reference to the accompanying drawings and preferred embodiments of the invention.
The invention discloses a simulation method for oxygen content distribution of a low-temperature carbonization furnace based on WORKBENCH, which comprises the following steps:
s1, establishing a three-dimensional simulation model of a muffle cavity and an inlet and outlet sealing cavity of the low-temperature carbonization furnace by adopting a Design Modler module of CAD (computer aided Design) software in WORKBENCH (computer aided Design) software, as shown in a figure 1, and setting geometric parameters of the three-dimensional simulation model; the set geometrical parameters at least comprise: the geometric shape and the geometric dimension of the muffle cavity, the geometric shape and the geometric dimension of the inlet and the outlet seal, the inlet dimension of the inlet and the outlet seal nitrogen pipe and the outlet dimension of the nitrogen pipe.
S2, the three-dimensional simulation model of the muffle cavity of the carbonization furnace and the inlet and outlet sealing cavity which are established in the step S1 is transmitted to a Mesh division Mesh module, and the Mesh division is carried out on the three-dimensional simulation model in the Mesh module in a Sweep mode.
S3, transmitting the three-dimensional simulation model subjected to grid division in the step S2 to a CFX (computational fluid dynamics) calculation module of the WORKBENCH software, and setting parameters in the CFX calculation module; the process of setting parameters in the CFX calculation module is specifically as follows:
(3.1) introducing a custom temperature parameter compiled according to the process parameter in an Expression option;
(3.2) in the Buoyancy option, setting the Y-direction Gravity Y digit as a preset value according to requirements, and setting the Analysis Type option as Transient state calculation;
(3.3) setting Heat Transfer in the Fluid Models option as Thermal Energy, and selecting a k-epsilon model in the Turbulence option;
(3.4) selecting air and nitrogen in the Material Library option section;
(3.5) in the Fluid and particle Definitions option, the Fluid1 part is nitrogen and the Fluid2 part is oxygen;
(3.6) setting an inlet Boundary condition as Static Pressure in the Boundary option, setting a Heat Transfer option as a preset value according to actual requirements, setting an outlet Boundary condition as Average Static Pressure, setting each calculation domain as Interface for data exchange, setting walls as convection Heat exchange surfaces, defining the comprehensive temperature value of furnace wall air in each hour by using Expression, setting the convection Heat exchange coefficient as a preset value according to actual requirements, and setting other walls as Heat insulation smooth walls;
and (3.7) selecting the Define Run and then calculating.
S4, setting a detection point and a detection surface in a CFX calculation module in the WORKBENCH software, and carrying out simulation operation to obtain a simulation result which is used as an index for designing a muffle cavity structure and an inlet and outlet sealing structure of the low-temperature carbonization furnace; specifically, a central point of the three-dimensional simulation model in the muffle furnace may be selected as a detection point, and the detection plane 1 is an X-direction plane passing through the central point. The simulation result comprises: temperature change curves of the detection points, speed cloud pictures of the detection surface and temperature cloud pictures of the detection surface.
And S5, under the same geometric parameter setting condition, setting different parameters of the three-dimensional simulation model and repeating the steps S1 to S4 to perform multiple times of simulation calculation, wherein the temperature change curve of a detection point in the hearth, the temperature cloud picture of a detection surface and the airflow speed cloud picture of the detection surface are used as indexes for evaluating the heating effect and the airflow distribution characteristics of the hearth, so that the optimized hearth heat storage capacity and airflow distribution design are determined.
According to the invention, the ventilation time period is defined through the Expression, the oxygen content is modified in Boundary Conditions in the Fluid Values option, and the change rule of the Pressure of the sealing cavity and the heat storage capacity in the muffle furnace under different oxygen contents can be obtained by modifying the airflow Pressure in the inlet Boundary Static Pressure. Compared with the three oxygen contents, the temperature change curve has the same trend, but the heat storage capacity is different at different air flow speeds. In conclusion, the airflow speed has a delay effect on the temperature change, so that the gas on the wall surface of the hearth has a good heat preservation effect and excellent heat storage performance; the temperature cloud chart of the detection surface with different oxygen contents is shown as a schematic diagram in fig. 2, and the temperature distribution in the furnace discharging cavity is even. The oxygen content cloud of the test surface from different time periods is schematically shown in fig. 3, which shows that the oxygen content in the muffle chamber is not uniform, and the oxygen content concentration begins to increase along the entrance of the furnace chamber, indicating that the gas flow structure in the furnace chamber is unreasonable. In order to verify the simulation result of the WORKBENCH, the simulation results are simulated for multiple times, and the experimental results are compared and analyzed to obtain the optimal scheme of the gas distribution and heat storage performance of the muffle furnace chamber.
According to the invention, through simulating the heat flow field in the design process of the low-temperature carbonization furnace, the structure is optimally designed, the manufacturing cost of the low-temperature carbonization furnace is reduced on the premise of not reducing the existing heat insulation effect, the experimental cost can be reduced, the design is optimized, theoretical support is provided for reducing the production energy consumption of carbon fibers, a basis is provided for relevant numerical simulation research, and the defects of the prior art in the design stage of the low-temperature carbonization furnace are overcome.
The described embodiments of the present invention are only for describing the preferred embodiments of the present invention, and do not limit the concept and scope of the present invention, and the technical solutions of the present invention should be modified and improved by those skilled in the art without departing from the design concept of the present invention, and the technical contents of the present invention which are claimed are all described in the claims.
Claims (3)
1. A simulation method for oxygen content distribution of a low-temperature carbonization furnace based on WORKBENCH is characterized by comprising the following steps:
s1, establishing a three-dimensional simulation model of a muffle cavity of the low-temperature carbonization furnace and an inlet and outlet sealing cavity by adopting a CAD (computer aided Design) software Design Modeler module in WORKBENCH software, and setting geometric parameters of the three-dimensional simulation model; the set geometrical parameters at least comprise: the geometric shape of the muffle cavity, the geometric dimension of the muffle cavity, the sealing geometric shape of the inlet and the outlet, the sealing geometric dimension of the inlet and the outlet, the inlet dimension of a nitrogen pipe for sealing the inlet and the outlet, and the outlet dimension of the nitrogen pipe;
s2, transmitting the three-dimensional simulation models of the muffle cavity and the inlet and outlet sealing cavity of the carbonization furnace established in the step S1 to a Mesh division Mesh module, and carrying out Mesh division on the three-dimensional simulation models in the Mesh module by adopting a Sweep mode;
s3, transmitting the three-dimensional simulation model subjected to grid division in the step S2 to a CFX (computational fluid dynamics) calculation module of the WORKBENCH software, and setting parameters in the CFX calculation module; the process of setting parameters in the CFX calculation module is as follows:
(3.1) importing a custom temperature parameter compiled according to the process parameter in an Expression option;
(3.2) in the Buoyancy option, setting the Y-direction Gravity Y digit as a preset value according to requirements, and setting the Analysis Type option as Transient state calculation;
(3.3) setting Heat Transfer in the Fluid Models option as Thermal Energy, and selecting a k-epsilon model in the Turbulence option;
(3.4) selecting air and nitrogen in the Material Library option section;
(3.5) in the options of Fluid and particle Definitions, the Fluid1 part is nitrogen, and the Fluid2 part is oxygen;
(3.6) setting an inlet Boundary condition as Static Pressure in the Boundary option, setting a Heat Transfer option as a preset value according to actual requirements, setting an outlet Boundary condition as Average Static Pressure, setting each calculation domain as Interface for data exchange, setting walls as convection Heat exchange surfaces, defining the comprehensive temperature value of furnace wall air in each hour by using Expression, setting the convection Heat exchange coefficient as a preset value according to actual requirements, and setting other walls as Heat insulation smooth walls;
(3.7) calculating after selecting the Define Run;
s4, setting a detection point and a detection surface in a CFX calculation module in the WORKBENCH software, and carrying out simulation operation to obtain a simulation result which is used as an index for designing a muffle cavity structure and an inlet and outlet sealing structure of the low-temperature carbonization furnace;
and S5, under the same geometric parameter setting condition, setting different parameters of the three-dimensional simulation model, repeating the steps S1 to S4, performing multiple times of simulation calculation, and determining the optimized hearth heat storage capacity and airflow distribution design by taking the temperature change curve of the indoor detection point, the temperature cloud chart of the detection surface and the airflow speed cloud chart of the detection surface as indexes for evaluating the hearth heating effect and the airflow distribution characteristics.
2. The method for simulating the oxygen content distribution in a low-temperature carbonization furnace based on WORKBENCH as claimed in claim 1, wherein: in the step S4, the central point of the three-dimensional simulation model in the muffle furnace is selected as a detection point, and the detection surface is an X-direction plane passing through the central point.
3. The method for simulating the oxygen content distribution in a low-temperature carbonization furnace based on WORKBENCH as claimed in claim 1, wherein: in step S4, the simulation result includes: the temperature change curve of the detection point, the speed cloud picture of the detection surface and the temperature cloud picture of the detection surface.
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| WO2022011724A1 (en) * | 2020-07-17 | 2022-01-20 | 天华化工机械及自动化研究设计院有限公司 | Workbench-based method for simulating multi-coupling field stress distribution of low-temperature carbonization furnace |
| CN111680378B (en) * | 2020-07-17 | 2022-09-16 | 天华化工机械及自动化研究设计院有限公司 | ANSYS-based heat exchanger tube bundle modal analysis method in liquid filling state |
| CN112446177B (en) * | 2020-11-16 | 2023-01-03 | 天华化工机械及自动化研究设计院有限公司 | Simulation method for heat insulation performance of external heat insulation material of high-temperature carbonization furnace |
| WO2022099715A1 (en) * | 2020-11-16 | 2022-05-19 | 天华化工机械及自动化研究设计院有限公司 | Simulation method for visualizing dynamic distribution characteristics of oxygen concentration in high-temperature carbonization furnace |
| CN112270109B (en) * | 2020-11-16 | 2023-03-14 | 天华化工机械及自动化研究设计院有限公司 | Method for simulating heating performance of graphite rod in high-temperature carbonization furnace |
| CN112435716B (en) * | 2020-11-16 | 2023-04-07 | 天华化工机械及自动化研究设计院有限公司 | Visual simulation method for dynamic distribution characteristics of oxygen concentration in high-temperature carbonization furnace |
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