Method and system for evaluating quality of coke into furnace by using industrial CT
By combining industrial CT scanning with heat treatment and alkali metal etching, the problem of accuracy in detecting changes in the internal structure of coke has been solved, enabling rapid and accurate evaluation of coke quality and supporting stable blast furnace operation.
Patent Information
- Application Number
- CN202211736945.0
- Authority / Receiving Office
- CN · China
- Patent Type
- Patents(China)
- Current Assignee / Owner
- Filing Date
- 2022-12-31
- Publication Date
- 2026-01-27
- Estimated Expiration
- 2042-12-31
AI Technical Summary
Coke deteriorates severely during the deterioration process in the blast furnace. Existing technologies cannot effectively detect its strength, resulting in significant changes in its strength and size. Current technologies cannot accurately evaluate the changes in the internal structure of coke, which affects the stable operation of the blast furnace.
Industrial CT scans were used to scan the coke entering the furnace. Combined with heat treatment and alkali metal corrosion simulation of the blast furnace environment, the quality of the coke was evaluated by the changes in cracks and porosity before and after the scan.
This method enables accurate detection of the internal structure of coke, avoids particle size limitations, improves the accuracy and speed of evaluation, and provides a new method for coke quality evaluation.
Smart Images
Figure CN116008318B_ABST
Abstract
Description
Technical Field
[0001] This invention relates to the field of coke for blast furnace ironmaking, and in particular to a method and system for evaluating the quality of coke fed into the furnace using industrial CT. Background Technology
[0002] After entering the blast furnace, coke undergoes chemical reactions such as carbon melting, alkali metal corrosion, and slag-iron corrosion, leading to a continuous deterioration in its quality. This results in reduced strength, gradually smaller lumps, and ultimately, almost all of it is consumed within the blast furnace. As one of the most important raw materials in the blast furnace smelting process, the size of coke directly indicates the degree of quality deterioration. Coke deteriorates severely during its descent within the blast furnace, resulting in a loose internal structure, increased cracks, and impacting the stable operation of the blast furnace.
[0003] Coke is a hard, porous solid fuel. Cracks form during the coking process in the coking chamber of a coke oven when, as the temperature rises, the uneven shrinkage of the semi-coke generates stress that exceeds the strength of the porous coke structure. The heat treatment temperature and alkali metal content within the blast furnace are major factors affecting coke structure. The development of coke cracks and pore structure depends on the reactivity during heat treatment. At high temperatures, thermal stress increases between coke layers, causing carbon and ash to react internally, leading to coke volume expansion, cracking, and even continuous crack propagation. This increases the coke pulverization rate and reduces its size. Therefore, accurately assessing the degree of coke structural degradation in different parts of the furnace is essential for assisting operators in maintaining stable and smooth blast furnace operation. Summary of the Invention
[0004] This invention discloses a method and system for evaluating the quality of coke fed into the furnace using industrial CT, in order to solve any of the above-mentioned and other potential problems in the prior art.
[0005] To solve the above problems, the technical solution of the present invention is: a method for evaluating the quality of coke entering the furnace using industrial CT, the evaluation method specifically including the following steps:
[0006] S1) Randomly select multiple pieces of coke fed into the furnace as samples to obtain several coke samples A and B to be tested;
[0007] S2) Industrial CT was used to scan the original coke test samples A and B respectively to obtain the original crack and porosity characterization values of coke test samples A and B.
[0008] S3) The coke test samples A and B after S2) were treated by heat treatment and alkali metal etching respectively. After scanning with industrial CT, the internal crack and porosity characterization values of the coke test samples A and B after heat treatment and alkali metal etching were obtained.
[0009] S4) Process the internal crack and porosity characterization values collected at the same location in S2) and S3), and evaluate the quality of the coke entering the furnace based on the processing results.
[0010] Furthermore, the coke particle size in the coke test samples A and B in S1) is 40-50 mm.
[0011] Furthermore, the specific steps of S2) are as follows:
[0012] S2.1) First, take the original coke sample A to be tested, and use industrial CT to scan it to obtain the original crack length L1 and porosity R1 distribution characterization data of different parts of the coke sample A, and record them.
[0013] S2.2) First, take the original coke sample B and scan it with an industrial CT scanner to obtain the original crack length L2 and porosity R2 distribution characterization data of different parts of the original coke sample A, and record them.
[0014] Furthermore, the specific steps of S3) are as follows:
[0015] S3.1) Then, the coke sample A after S2) treatment is placed in an inert atmosphere and subjected to heat treatment at different temperatures and times, and then cooled to room temperature with the furnace. The coke sample after heat treatment is the sample A1.
[0016] S3.2) Take out the heat-treated coke sample A1, and scan the coke A1 again using industrial CT to obtain the length L3 and porosity R3 of cracks in different parts of the heat-treated coke, and record the distribution characterization data.
[0017] S3.3) Then place the coke sample B treated in S2) into alkali metal vapor and heat it to a predetermined temperature to erode the original coke sample B, and obtain the eroded coke sample as sample B1.
[0018] S3.4) Take out the heat-treated coke sample B1 and scan it again with industrial CT to obtain the length L4 and porosity R4 of the cracks in different parts of the eroded coke, and record the distribution data.
[0019] Furthermore, the inert atmosphere in S3.1) is N2 or Ar2;
[0020] The heat treatment temperature is 1100~1500℃, and the heat treatment time is 1-3h.
[0021] Furthermore, the alkali metal in S3.4) is K or Na; the temperature is raised to 1300℃, the alkali metal content is in the range of 1% to 5%, and the reaction time is 85-95 min.
[0022] Furthermore, the specific steps of S4 are as follows:
[0023] S4.1) The crack lengths and pore sizes of the coke test samples A and A1 are statistically analyzed to obtain the difference in crack length ΔL between the coke test samples before and after heat treatment. a =L1-L2 and the difference in aperture distribution ΔR a =R1-R2;
[0024] S4.2) The crack lengths and pore sizes of the coke samples B and B1 were statistically analyzed to obtain the difference in crack length ΔL between the coke samples before and after alkali metal corrosion. b =L3-L4 and the difference in pore size distribution ΔR b =R3-R4;
[0025] S4.3) The quality of the coke fed into the furnace is evaluated based on the difference obtained in S4.1) and the difference obtained in S4.2).
[0026] Furthermore, in S4.3), ΔL a Indicates the mass of coke at high temperature; ΔR represents the strength of the coke.
[0027] Through ΔL b ΔR represents the mass of coke after it has adsorbed alkaline vapor. b This indicates the strength of the coke.
[0028] Another object of the present invention is to provide a system for implementing the above-described method for evaluating the quality of coke entering the furnace using industrial CT, the system comprising:
[0029] The data acquisition module is used to acquire scanning data of coke samples before and after processing using industrial CT.
[0030] The analysis and processing module is used to process the collected scan data and obtain analysis results;
[0031] The evaluation module is used to evaluate the quality of the coke fed into the furnace based on the analysis results and output the results.
[0032] A readable storage medium includes a memory storing a program and a processor that executes the above-described method for evaluating the quality of coke fed into the furnace using industrial CT.
[0033] To avoid the limitations of traditional coke structure testing for small particle sizes, this technique uses a method of randomly selecting multiple pieces of coke fed into the furnace to prepare the test sample, and the coke particle size can be any size.
[0034] Industrial CT scans can observe the distribution of cracks and pores in any part of the coke interior;
[0035] The heat treatment temperature range is 1100~1500℃, and the heat treatment time is 1~3h;
[0036] The alkali metal content is 1%–7%, and the reaction time is 90 min;
[0037] ΔL a With ΔR a These represent the changes in internal crack length and pore size of coke before and after high-temperature heat treatment; ΔL a The larger the value, the worse the quality of the coke at high temperatures; the larger the value of ΔR, the lower the strength of the coke.
[0038] ΔL b With ΔR b These represent the changes in internal crack length and pore size of coke before and after alkali metal corrosion; ΔL b The larger the value, the worse the quality of the coke after it adsorbs alkali vapor; ΔR b The larger the value, the lower the strength of the coke.
[0039] Industrial CT scans allow us to observe internal cracks and pores, qualitatively characterizing the quality of coke. Scanning electron microscopy (SEM), however, only scans the sample surface and cannot observe the internal structure. Transmission electron microscopy (TEM), on the other hand, creates an image by focusing and magnifying an electron beam through the sample. Therefore, TEM observes the fine internal structure of the sample, such as crystal structure and morphology, rather than macroscopic phenomena like cracks and pores.
[0040] The advantages of this invention compared to existing technologies are as follows: By adopting the above-mentioned technical solution, the method of this invention improves upon the problem of excessively limited particle size in the original methods for detecting the micro and macroscopic structure of coke, and also avoids the error between the actual blast furnace coke deterioration process and experimental results. It directly characterizes the crack length and porosity distribution of coke to evaluate the quality of coke entering the blast furnace. This invention can simply, quickly, and accurately detect the internal structure of coke, providing a new approach and method for coke quality evaluation systems. Attached Figure Description
[0041] Figure 1 This is a flowchart of a method for characterizing coke block size, internal cracks, and pore structure using CT according to the present invention.
[0042] Figure 2 This is a flowchart illustrating an embodiment of the present invention.
[0043] Figure 3 This is a logic block diagram of the system of the present invention. Detailed Implementation
[0044] The technical solution of the present invention will be further described below with reference to the accompanying drawings and specific embodiments.
[0045] like Figure 1 As shown, this invention provides a method for evaluating the quality of coke entering the furnace using industrial CT, the evaluation method specifically including the following steps:
[0046] S1) Randomly select multiple pieces of coke fed into the furnace as samples to obtain several coke samples A and B to be tested;
[0047] S2) Industrial CT was used to scan the original coke test samples A and B respectively to obtain the original crack and porosity characterization values of coke test samples A and B.
[0048] S3) The coke test samples A and B after S2) were treated by heat treatment and alkali metal etching respectively. After scanning with industrial CT, the internal crack and porosity characterization values of the coke test samples A and B after heat treatment and alkali metal etching were obtained.
[0049] S4) Process the internal crack and porosity characterization values collected at the same location in S2) and S3), and evaluate the quality of the coke entering the furnace based on the processing results.
[0050] The coke particle size in samples A and B of S1) is 40-50 mm.
[0051] The specific steps of S2) are as follows:
[0052] S2.1) First, take the original coke sample A to be tested, and use industrial CT to scan it to obtain the original crack length L1 and porosity R1 distribution characterization data of different parts of the coke sample A, and record them.
[0053] S2.2) First, take the original coke sample B and scan it with an industrial CT scanner to obtain the original crack length L2 and porosity R2 distribution characterization data of different parts of the original coke sample A, and record them.
[0054] The specific steps of S3 are as follows:
[0055] S3.1) Then, the coke sample A after S2) treatment is placed in an inert atmosphere and subjected to heat treatment at different temperatures and times, and then cooled to room temperature with the furnace. The coke sample after heat treatment is the sample A1.
[0056] S3.2) Take out the heat-treated coke sample A1, and scan the coke A1 again using industrial CT to obtain the length L3 and porosity R3 of cracks in different parts of the heat-treated coke, and record the distribution characterization data.
[0057] S3.3) Then place the coke sample B treated in S2) into alkali metal vapor and heat it to a predetermined temperature to erode the original coke sample B, and obtain the eroded coke sample as sample B1.
[0058] S3.4) Take out the heat-treated coke sample B1 and scan it again with industrial CT to obtain the length L4 and porosity R4 of the cracks in different parts of the eroded coke, and record the distribution data.
[0059] The inert atmosphere in S3.1) is N2 or Ar2;
[0060] The heat treatment temperature is 1100~1500℃, and the heat treatment time is 1-3h.
[0061] The alkali metal in S3.4) is K or Na; the temperature is raised to 1300℃, the alkali metal content is in the range of 1% to 5%, and the reaction time is 85-95 min.
[0062] The specific steps of S4 are as follows:
[0063] S4.1) The crack lengths and pore sizes of the coke samples A and A1 were statistically analyzed to obtain the difference in crack length ΔL between the coke samples before and after heat treatment. a =L1-L2 and the difference in aperture distribution ΔR a =R1-R2;
[0064] S4.2) The crack lengths and pore sizes of the coke samples B and B1 were statistically analyzed to obtain the difference in coke crack length ΔL before and after alkali metal corrosion. b =L3-L4 and the difference in pore size distribution ΔR b =R3-R4;
[0065] S4.3) The quality of the coke fed into the furnace is evaluated based on the difference obtained in S4.1) and the difference obtained in S4.2).
[0066] In S4.3), through ΔL a Indicates the mass of coke at high temperature; ΔR represents the strength of the coke.
[0067] Through ΔL b ΔR represents the mass of coke after it has adsorbed alkaline vapor. b This indicates the strength of the coke.
[0068] like Figure 3 As shown, a system for implementing the above-described method of evaluating the quality of coke fed into the furnace using industrial CT is provided, the system comprising:
[0069] The data acquisition unit is used to acquire scanning data of the coke samples before and after processing using industrial CT.
[0070] The analysis and processing unit is used to process the acquired scan data and obtain analysis results;
[0071] The evaluation unit is used to evaluate the quality of the coke fed into the furnace based on the analysis results and output the results.
[0072] A readable storage medium includes a memory storing a program and a processor that executes the above-described method for evaluating the quality of coke fed into the furnace using industrial CT.
[0073] Implementation Case:
[0074] like Figure 2 As shown, this invention provides a method for characterizing coke bulk size, internal cracks, and pore structure using CT, comprising the following steps:
[0075] (1) Randomly select multiple pieces of coke from the same batch of furnace in a steel plant as the experimental samples, and randomly select 3 standard coke samples A and B to be tested respectively;
[0076] (2) Take three standard samples A and B respectively, and use industrial CT scanning to obtain the distribution of coke crack structure. Randomly select one part of coke A (or B) with crack length L1 = 16.3 mm (or L3 = 5 mm) and pore diameter R1 (or R3).
[0077] (3) Select the same standard sample A, and set the heat treatment temperature to 1100℃ under argon atmosphere. After heat treatment for 1 hour, cool it to room temperature with the furnace. The coke sample after heat treatment is the test sample A1. Then, CT scan is performed to obtain the crack length L2 = 23.8 mm and the pore size R2 of the coke after heat treatment. One set of tests is completed.
[0078] (4) Select two other standard samples A and set the heat treatment temperature to 1300℃ and 1500℃ respectively, and repeat step (3);
[0079] (5) Select the same standard sample B, set the reaction temperature to 1300℃, react the coke with 1% K (or Na) vapor in a sealed container for 1.5h, and then cool it to room temperature. The coke sample after alkali metal corrosion is the test sample B1. Then, use industrial CT scanning to obtain the crack length L4 = 36mm and the pore size R4 of coke B1, and complete 1 set of tests.
[0080] (6) Select two other standard samples B, with alkali vapor K (or Na) contents of 3% and 5% respectively, and repeat step (5);
[0081] (7) Three sets of tests were conducted on each coke sample. The differences in coke crack length ΔL and porosity ΔR were statistically analyzed, and the final result was: ΔL a ;ΔL b ;ΔR a ;ΔR b。
[0082] The foregoing has provided a detailed description of a method and system for evaluating the quality of coke fed into the furnace using industrial CT, as provided in the embodiments of this application. The descriptions of the embodiments above are merely for the purpose of helping to understand the method and its core ideas; furthermore, those skilled in the art will recognize that, based on the ideas of this application, there will be changes in the specific implementation methods and application scope. Therefore, the content of this specification should not be construed as a limitation of this application.
[0083] Certain terms are used in the specification and claims to refer to specific components. Those skilled in the art will understand that hardware manufacturers may use different names to refer to the same component. This specification and claims do not distinguish components based on differences in name, but rather on differences in function. The terms "comprising" and "including" used throughout the specification and claims are open-ended and should be interpreted as "comprising / including but not limited to". "Approximately" means that within an acceptable margin of error, those skilled in the art can solve the technical problem and substantially achieve the technical effect within a certain margin of error. The following descriptions in the specification are preferred embodiments for carrying out this application; however, these descriptions are for the purpose of illustrating the general principles of this application and are not intended to limit the scope of this application. The scope of protection of this application shall be determined by the appended claims.
[0084] It should also be noted that the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a product or system comprising a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a product or system. Without further limitation, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the product or system that includes said element.
[0085] It should be understood that the term "and / or" used in this article is merely a description of the relationship between related objects, indicating that three relationships can exist. For example, A and / or B can represent: A existing alone, A and B existing simultaneously, and B existing alone. Additionally, the character " / " in this article generally indicates that the preceding and following related objects have an "or" relationship.
[0086] The foregoing description illustrates and describes several preferred embodiments of this application. However, as previously stated, it should be understood that this application is not limited to the forms disclosed herein and should not be construed as excluding other embodiments. It can be used in various other combinations, modifications, and environments, and can be altered within the scope of the application concept described herein through the foregoing teachings or techniques or knowledge in related fields. Any modifications and variations made by those skilled in the art that do not depart from the spirit and scope of this application should be within the protection scope of the appended claims.
Claims
1. A method for evaluating the quality of coke fed into the furnace using industrial CT, characterized in that, The evaluation method specifically includes the following steps: S1) Randomly select multiple pieces of coke fed into the furnace as samples to obtain several coke samples A and B to be tested; S2) Industrial CT was used to scan the original coke test samples A and B respectively to obtain the original crack and porosity characterization values of coke test samples A and B. S3) The coke samples A and B after S2) were treated by heat treatment and alkali metal etching respectively. After scanning by industrial CT, the internal crack and porosity characterization values of the coke samples A and B after heat treatment and alkali metal etching were obtained. The specific steps are as follows: S3.1) Then, the coke sample A after S2) treatment is placed in an inert atmosphere and subjected to heat treatment at different temperatures and times, and then cooled to room temperature with the furnace. The coke sample after heat treatment is the sample A1. The inert atmosphere is N2 or Ar2; The heat treatment temperature is 1100~1500℃, and the heat treatment time is 1-3h; S3.2) Take out the heat-treated coke sample A1, and scan the coke A1 again using industrial CT to obtain the length L3 and porosity R3 of cracks in different parts of the heat-treated coke, and record the distribution characterization data. S3.3) Then place the coke sample B treated in S2) into alkali metal vapor and heat it to a predetermined temperature to erode the original coke sample B, and obtain the eroded coke sample as sample B1. S3.4) Take out the heat-treated coke sample B1, and scan the coke B1 again using industrial CT to obtain the length L4 and porosity R4 of the cracks in different parts of the eroded coke, and record the distribution characterization data. The alkali metal is K or Na; the temperature is heated to 1300℃, the alkali metal content is in the range of 1% to 5%, and the reaction time is 85-95 min. S4) Process the internal crack and porosity characterization values collected at the same location in S2) and S3), and evaluate the quality of the coke entering the furnace based on the processing results.
2. The evaluation method according to claim 1, characterized in that, The coke particle size in samples A and B of S1) is 40-50 mm.
3. The evaluation method according to claim 1, characterized in that, The specific steps of S2) are as follows: S2.1) First, take the original coke sample A to be tested, and use industrial CT to scan it to obtain the original crack length L1 and porosity R1 distribution characterization data of different parts of the coke sample A, and record them. S2.2) First, take the original coke sample B and scan it with an industrial CT scanner to obtain the original crack length L2 and porosity R2 distribution characterization data of different parts of the original coke sample A, and record them.
4. The evaluation method according to claim 1, characterized in that, The specific steps of S4 are as follows: S4.1) The crack lengths and pore sizes of the coke test samples A and A1 are statistically analyzed to obtain the difference in crack length ΔL between the coke test samples before and after heat treatment. a =L1-L2 and the difference in aperture distribution ΔR a =R1-R2; S4.2) The crack lengths and pore sizes of the coke samples B and B1 were statistically analyzed to obtain the difference in crack length ΔL between the coke samples before and after alkali metal corrosion. b =L3-L4 and the difference in pore size distribution ΔR b =R3-R4; S4.3) The quality of the coke fed into the furnace is evaluated based on the difference obtained in S4.1) and the difference obtained in S4.2).
5. The evaluation method according to claim 4, characterized in that, In S4.3), through ΔL a Indicates the mass of coke at high temperature; ΔR represents the strength of the coke. Through ΔL b ΔR represents the mass of coke after it has adsorbed alkaline vapor. b This indicates the strength of the coke.
6. A system for implementing the method for evaluating the quality of coke fed into the furnace using industrial CT as described in any one of claims 1-5, characterized in that, The system includes: The data acquisition module is used to acquire scanning data of coke samples before and after processing using industrial CT. The analysis and processing module is used to process the collected scan data and obtain analysis results; The evaluation module is used to evaluate the quality of the coke fed into the furnace based on the analysis results and output the results.
7. A readable storage medium, characterized in that, It includes a memory storing a program and a processor that executes the method for evaluating the quality of coke entering the furnace using industrial CT as described in any one of claims 1-5.