Method for improving metallurgical coke average particle size detection accuracy

Abstract

The invention discloses a method for improving metallurgical coke average particle size detection accuracy, and belongs to the technical field of detection. The method comprises the following steps: step 1, determining the influence of coke moisture; 2, strictly standardizing a detection tool test sieve; step 3, determining a calibration and verification system and rule of the test sieve; step 4; standardizing the sampling method and quantity; 5, standardizing a sample screening process; 6, the detection loss amount is stipulated; and 7, mechanical screening requirements and dispute treatment methods are stipulated. The technical problem of large data difference in the coke average particle size detection process is effectively solved, real and reliable data can be provided for coking industry production and blast furnace stable operation, the metallurgical coke quality is improved through coking production, the coal blending technical structure is optimized, the coal blending cost is reduced, and the coke average particle size detection method is suitable for industrial production. And a basic condition is laid for stable yield and high yield of the blast furnace, so that huge economic benefits and good social benefits are generated.

Description

TECHNICAL FIELD

[0001] The application belongs to the technical field of detection, and particularly relates to a method for improving detection accuracy of average particle size of metallurgical coke. BACKGROUND

[0002] Metallurgical coke is the most basic, most important and largest consumption of blast furnace production basic material, and its quality is the key to improving the utilization coefficient of blast furnace. The steel industry implements the direction of energy-saving, green and efficient development, continuously reduces the fuel ratio, improves the utilization coefficient of blast furnace, and the average particle size of coke is one of the most intuitive and basic quality control indexes. The average particle size of coke is a physical property representing the particle size distribution of coke, which is an index for evaluating the size and uniformity of coke. The calculation method of the average particle size of coke is to multiply the percentage of each particle size by the corresponding median value of each particle size, and the weighted result is the average particle size of coke. Good average particle size performance of metallurgical coke is the basis of the blast furnace permeability index, and the permeability of the blast furnace column directly affects the smooth running of the blast furnace, the distribution of blast furnace gas flow and the utilization rate of blast furnace gas. If the particle size of coke is too large, the larger pores and cracks in the coke are easy to produce coke in the process of transportation, loading and other processes; if the particle size of coke is too small, the blast furnace permeability, liquid permeability and other properties are affected in the ironmaking process, which has an adverse effect on the smooth running and long life of the blast furnace. In order to ensure the stable running of the blast furnace smelting process and obtain good production index, it is necessary to ensure the average particle size of coke to improve the permeability of the blast furnace column. With the increasing large-scale of blast furnace, the average particle size of metallurgical coke has attracted more and more attention of blast furnace workers and coking workers.

[0003] The detection method of the average particle size of metallurgical coke is to screen a certain weight of metallurgical coke sample by using a prescribed test sieve, calculate the percentage of the mass of each particle size in the total mass of the sample, and then multiply the average diameter of each adjacent two standard test sieves to obtain the average particle size of metallurgical coke. The accuracy of the detection data of the average particle size of coke is affected by many factors, and the difference of the detection data is increased. How to improve the detection accuracy of the average particle size of metallurgical coke and provide more real and more guiding data for coking production and blast furnace smelting. SUMMARY

[0004] In order to solve the above technical problems, the purpose of the present application is to provide a method for improving the detection accuracy of the average particle size of metallurgical coke.

[0005] In order to solve the above technical problems, the present application adopts the following technical scheme:

[0006] The present application is a method for improving the detection accuracy of the average particle size of metallurgical coke, and the specific implementation steps are as follows:

[0007] Step 1, determine the influence of coke moisture

[0008] The total moisture of the sample should be controlled within ≤2.5%, and when the moisture of the sample to be tested is greater than 2.5%, it should be properly treated before detection;

[0009] Further, when the coke is dry quenched coke, the moisture is less than 0.35%, and the step-by-step moisture determination can not be done.

[0010] The calculation formula is moisture treatment, which requires step-by-step moisture determination to be brought into the calculation formula, which is characterized by

[0011]

[0012] ds = ∑S i d i (2)

[0013] In the formula:

[0014] m i ---The mass of each particle size, in kilograms kg;

[0015] m---The mass of the sample, in kilograms kg;

[0016] M ti ---The total moisture of each particle size, in mass percentage%;

[0017] M t ---The total moisture of the sample, in mass percentage%;

[0018] ds---The average particle size of metallurgical coke, in millimeters mm;

[0019] S i ---The mass percentage of each particle size of coke%;

[0020] d i ---The average particle size of each particle size, in millimeters mm, calculated from the average diameter of the upper limit and lower limit of the standard test sieve, greater than 80mm is calculated as 90mm, and less than 25mm is calculated as 12.5mm;

[0021] Step 2, strictly regulate the test tool test sieve

[0022] The test sieve is a square hole sieve piece;

[0023] Step 3, ensure the test sieve calibration and verification system and rules

[0024] According to the frequency of use of the test sieve, determine the reasonable verification or calibration period, method and parameters;

[0025] The sieve piece should complete the metrological verification or calibration within the specified period;

[0026] Step 4; Standardize the sampling method and quantity

[0027] According to the national technical standard specification sampling method;

[0028] Consider the accuracy and practicality of the test data, and make detailed provisions for the quality of the test experiment;

[0029] Step 5, specification sample screening process

[0030] The sample screening is poured into the test screen in batches, and the manual screening is carried out, and the size greater than 25mm must be manually perforated;

[0031] When the sieve is manually perforated, as long as it is free to pass through the sieve hole in any direction, it is counted as the undersize;

[0032] When screening, the amount of each sieve is not more than 25kg to prevent the coke from being broken by impact;

[0033] Step 6, specify the loss amount of detection

[0034] The difference between the total mass of each particle size of coke detection screening and the total mass of sampling is called the loss amount;

[0035] Step 7, specify the mechanical screening requirements and dispute processing method

[0036] Mechanical sieve or rolling sieve is allowed to be used, but comparison test with hand sieve must be carried out, and when there is no significant difference, the hand sieve is used; When there is a dispute, the hand sieve is used, and the moisture content is measured step by step.

[0037] Further, in step 2, the screen sheet is a punched screen with a size of 1000mm*700mm.

[0038] Further, in step 2, the screen sheet is punched by a punch press, and the edge of the punched screen sheet is not allowed to be flattened by a hammer.

[0039] Further, in step 2, when the screen sheet is installed, the punching burr is downward, and the burr is flattened by a sand wheel.

[0040] Further, in step 2, all the punched holes must be completely included in the effective area.

[0041] Further, in step 2, if the length of the screen hole of each screen sheet exceeds 2% of the nominal value, it is a waste hole, and when the number of holes exceeds 10% of the total number of screen holes, the screen sheet needs to be replaced.

[0042] Further, in step 6, when the loss amount is greater than or equal to 0.5kg, the test is invalid, and when it is less than 0.5kg, it is counted in the size less than 25mm.

[0043] Compared with the prior art, the beneficial technical effects of the present application are:

[0044] The present application provides a technical scheme for improving the detection accuracy of the average particle size of metallurgical coke, effectively solves the technical problem of large data difference in the detection process of the average particle size of coke, and provides real and reliable data for the production of the coking industry and the stable operation of the blast furnace, improves the quality of metallurgical coke in coking production, optimizes the technical structure of coal blending, reduces the cost of coal blending, and lays a foundation for stable and high production of the blast furnace due to the real and reliable performance data of the most important raw material of the blast furnace, thereby generating huge economic benefits and good social benefits. BRIEF DESCRIPTION OF DRAWINGS

[0045] The present application will be further described below in combination with the drawings.

[0046] Figure 1 The figure shows a square screen hole of the screen sheet. DETAILED DESCRIPTION

[0047] In order to enable personnel in the art to better understand the present application scheme, the present application will be further described in detail below in combination with specific embodiments.

[0048] The present application is a method for improving the detection accuracy of the average particle size of metallurgical coke, and the core principle is: moisture control, screen sheet specification, metering calibration, appropriate sample amount, rigorous screening steps, clear loss, and method comparison.

[0049] A method for improving the detection accuracy of the average particle size of metallurgical coke, the specific implementation steps are:

[0050] Step 1, clarify the influence of coke moisture.

[0051] Further, the sampling site of the sample should follow the principle of consensus of both supply and demand parties;

[0052] Further, the total moisture of the sample should be controlled within ≤2.5%, and when the moisture of the sample to be tested is greater than 2.5%, appropriate treatment should be performed first, and then detection can be performed;

[0053] Further, when the coke is dry quenching coke, the moisture is less than 0.35%, and the step-by-step moisture determination can be omitted.

[0054] Further, the calculation formula is treated with moisture, and the step-by-step moisture determination is required to be brought into the calculation formula, which is characterized by:

[0055]

[0056] ds = ∑S i d i (2)

[0057] In the formula:

[0058] m i--- Mass of each size fraction in kilograms (kg);

[0059] m --- Mass of sample in kilograms (kg);

[0060] M ti --- Total moisture of each size fraction in percent by mass (%);

[0061] M t --- Total moisture of sample in percent by mass (%);

[0062] ds --- Average size of metallurgical coke in millimeters (mm);

[0063] S i --- Mass percent of each size fraction of coke (%);

[0064] d i --- Average size of each size fraction in millimeters (mm) calculated from the average diameter of the upper and lower limit of the standard test sieve, greater than 80 mm is calculated as 90 mm, less than 25 mm is calculated as 12.5 mm.

[0065] Step 2, strictly regulate the testing tool test sieve;

[0066] Further, the test sieve sheet is a square hole sieve sheet;

[0067] Further, the sieve sheet is a 1000 mm x 700 mm punched sieve, and the sieve hole is a square as shown in Table 1. Figure 1

[0068]

[0069] Further, the sieve sheet is punched by a punch press, and after punching, the edge of the sieve sheet is not allowed to be flattened with a hammer;

[0070] Further, when installing, the punched burr is downward, and the burr is flattened with a sand wheel;

[0071] Further, all punched holes must be completely included in the effective area.

[0072] Further, if any side length of the sieve hole of each level of sieve sheet exceeds the nominal value by 2%, it is a waste hole, and if the number of holes exceeds 10% of the total number of sieve holes, the sieve sheet needs to be replaced.

[0073] Step 3, ensure the test sieve calibration and verification system and rules;

[0074] Further, according to the frequency of use of the test sieve, determine the reasonable verification or calibration period, method and parameters;

[0075] Further, the sieve sheet should complete the metrological verification or calibration within the specified period;​

[0076] Step 4: Standard sampling method and quantity;

[0077] Further, according to the national technical standard sampling method;

[0078] Further, taking into account the accuracy and practicality of the detection data, the quality of the detection experiment is specified in detail;

[0079] Step 5, standard sample screening process;

[0080] Further, the sample screening is poured into the test sieve in batches, evenly and slowly, and manual screening is performed. The size greater than 25mm must be manually perforated;

[0081] Further, when the sieve is manually perforated, as long as it freely passes through the sieve hole in any direction, it is counted as the undersize;

[0082] Further, during screening, the amount of each sieve is not more than 25kg to prevent the coke from being broken by impact.

[0083] Step 6, specify the detection loss;

[0084] Further, the difference between the total mass of each size of coke detection screening and the total mass of sampling is called the loss. When the loss is ≥0.5kg, the test is invalid, and when it is <0.5kg, it is counted in the <25mm size;

[0085] Step 7, specify the mechanical screening requirements and dispute resolution method;

[0086] Further, mechanical sieving or rolling sieving is allowed, but must be compared with manual sieving. If there is no significant difference, it can be used.

[0087] Further, when there is a dispute, the manual sieve is used as the standard, and the moisture is measured step by step.

[0088] In order to further fully illustrate the patent technology, the detection of the average particle size of metallurgical coke produced by a certain steel joint enterprise and used in blast furnaces is used to illustrate the patent technology.

[0089] In order to further illustrate the patent technology, the dry quenching and wet quenching of metallurgical coke are used to illustrate the patent technology.

[0090] Example 1

[0091] The dry quenching equipment of a certain coke production enterprise was repaired for 65 days, and all wet quenching was used to produce coke with a moisture content of 3.0-4.0% to meet the needs of downstream blast furnace production. Example 1 uses this wet quenching coke as an example to illustrate the patent technology in detail.

[0092] According to the technical specification requirements of national technical standard GB / T 1997, 100 kg of sample is taken on the belt of the coking plant, and the moisture of the metallurgical coke is detected as 3.2%. The sample is evenly spread and dried in the test drying room for 1.5 hours, and then the total sample is taken to detect the moisture of the sample as 1.9%, and the detection result is less than 2.5%, which meets the repeatability detection error requirements. The test sample is sieved by using 80 mm, 60 mm, 40 mm and 25 mm four-stage square hole sieves, the square hole sieves are detected by a measurement unit with qualification, and the sieve holes meet the requirements. 100 kg of test sample is evenly and slowly poured into the test sieve for 4-5 times, and the sample greater than 25 mm is hand-punched, and the hand-punched sieve is only counted as the undersize when it freely passes through the sieve hole in any direction; the sample sieving should not be violently vibrated to prevent the coke from being broken by impact. After sieving, the ≥80 mm, 80-60 mm, 60-40 mm, 40-25 mm and ≤25 mm particle size coke is weighed, and the moisture of each particle size is detected, and the detection data is shown in Table 2. After detection, the loss is calculated, that is, the difference between the total mass of each particle size of the coke detection and the total mass of the sample is called the loss. The measured loss is 0.38 kg, and when the loss is less than 0.5 kg, it is counted into the less than 25 mm size.

[0093] Table 2 detection analysis data

[0094]

[0095] According to the data and the calculation formula, the average particle size of the metallurgical coke of the steel joint venture is calculated as 55.53 mm.

[0096] Example 2

[0097] The coke is produced by a normal dry quenching coke production enterprise, and the moisture of the coke is controlled between 0.10-0.25%.

[0098] Example 2 takes the dry quenching coke as an example to illustrate the patent technology in detail.

[0099] According to the technical specification requirements of national technical standard GB / T1997, 100 kg of samples are taken on the belt of the coking plant, and the moisture of the metallurgical coke is detected as 0.20%. The test samples are sieved by using 80 mm, 60 mm, 40 mm and 25 mm four-stage square hole sieves respectively, the square hole sieves are detected by a measurement unit with an identification qualification, and the sieve holes meet the requirements. 100 kg of test samples are poured into the test sieve in 4-5 times evenly and slowly, and the samples larger than 25 mm are perforated by hand, the sieve upper material is counted as sieve lower material as long as it is free to pass through the sieve hole in any direction; the sample sieving should not be vibrated violently to prevent the coke from being broken by impact. After sieving, the coke of ≥80 mm size, 80-60 mm size, 60-40 mm size, 40-25 mm size and ≤25 mm size are weighed respectively, and the moisture of each size is detected, and the detection data are shown in Table 2. After detection, the loss is calculated, that is, the difference between the total mass of each size of coke in the detection and sieving and the total mass of the sample is called the loss. The measured loss is 0.38 kg, and when the loss is less than 0.5 kg, it is counted into the coke smaller than 25 mm.

[0100] Table 3 detection analysis data

[0101]

[0102] According to the data and the calculation formula, the average particle size of the metallurgical coke of the steel joint venture is calculated as 59.06 mm.

[0103] The application provides a technical solution for improving the detection accuracy of the average particle size of metallurgical coke, effectively solves the technical problem that the data difference is large in the detection process of the average particle size of coke, and the application of the patent can provide real and reliable data for the production of the coking industry and the stable operation of the blast furnace, improve the quality of the metallurgical coke in the coking production, optimize the technical structure of the coal blending, reduce the cost of the coal blending, and lay a foundation for the stable and high production of the blast furnace due to the real and reliable performance data of the most important raw material of the blast furnace, thereby generating huge economic benefits and good social benefits.

[0104] The above-described embodiments are only used to describe the preferred modes of the application, and do not limit the scope of the application, and various modifications and improvements of the technical solutions of the application made by those skilled in the art without departing from the design spirit of the application should fall within the protection scope of the claims of the application.

Claims

1. A method for improving the accuracy of detecting the average particle size of metallurgical coke, characterized by: The specific implementation steps are: Step 1: Identify the impact of coke moisture The total moisture content of the sample should be controlled within 2.5%. If the moisture content of the sample is greater than 2.5%, it should be properly treated before testing. When the coke is dry quenched and the moisture content is less than 0.35%, it is not necessary to perform step-by-step moisture determination. The calculation formula is used to process moisture, which requires the moisture to be measured step by step and then brought into the calculation formula. ds=∑S i d i (2) Where: m i ---The mass of each particle size in kilograms; m---the mass of the sample, in kilograms; M ti ---Total moisture content of each particle size, expressed as mass percentage; M t --- Total moisture content of the sample, expressed as mass percentage; ds---average particle size of metallurgical coke, in millimeters; S i --- Mass percentage of each particle size coke %; d i ---The average particle size of each particle size fraction, in millimeters (mm), is calculated based on the average diameter of the upper and lower limit sieves of the standard test sieve. If the particle size is larger than 80 mm, it is calculated as 90 mm, and if the particle size is smaller than 25 mm, it is calculated as 12.5 mm; Step 2: Strictly standardize the test sieve of the detection tool The test sieve is a square hole sieve; Step 3: Establish test sieve calibration and verification system and rules Determine reasonable verification or calibration cycles, methods, and parameters based on the frequency of use of the test sieve; The sieve should be verified or calibrated within the prescribed period; Step 4: Standardize sampling methods and quantities Sampling methods shall be specified in accordance with national technical standards; Taking into account the accuracy and practicality of test data, detailed regulations are made on the quality of test experiments; Step 5: Standardize the sample screening process The sample screening should be poured into the test sieve evenly and slowly in batches and screened manually. If the sample is larger than 25mm, it must be punched by hand. When the oversize material is manually passed through the sieve, any material that passes freely through the sieve holes in any direction will be counted as undersize material. When screening, the amount of material put into the screen each time should not exceed 25kg to prevent the coke from being broken by impact; Step 6: Specify the amount of detection loss The difference between the total mass of each particle size in the coke test screening and the total mass of the sample is called the loss; Step 7: Specify mechanical screening requirements and dispute resolution methods Mechanical sieves or rolling sieves are allowed, but they must be compared with hand sieves and no significant difference can be found before they can be used. In case of dispute, hand sieves shall prevail and the moisture content shall be measured step by step.

2. The method for improving the accuracy of detecting the average particle size of metallurgical coke according to claim 1, characterized in that: In the step 2: the sieve is a perforated sieve of 1000 mm × 700 mm.

3. The method for improving the accuracy of detecting the average particle size of metallurgical coke according to claim 1, characterized in that: In step 2: the screen is punched with a punch press, and after punching, it is not allowed to flatten the edge with a hammer.

4. The method for improving the accuracy of detecting the average particle size of metallurgical coke according to claim 1, wherein: In step 2: when installing the screen, place the punched burrs downwards and use a grinding wheel to smooth the burrs.

5. The method for improving the accuracy of detecting the average particle size of metallurgical coke according to claim 1, characterized in that: In step 2: all punching holes must be completely included in the effective area.

6. The method for improving the accuracy of detecting the average particle size of metallurgical coke according to claim 1, characterized in that: In step 2, if the length of any side of the sieve holes of each level exceeds the nominal value by 2%, they are waste holes. If the number of such holes exceeds 10% of the total number of sieve holes, the sieve needs to be replaced.

7. The method for improving the accuracy of detecting the average particle size of metallurgical coke according to claim 1, characterized in that: In step 6: when the loss is ≥ 0.5 kg, the test is invalid; when it is < 0.5 kg, it is counted as less than 25 mm.

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