Rapid method for evaluating quality of single coal for testing loss amount of coking single coal after high-temperature reaction
By employing standardized processing and high-temperature reaction testing methods, the problems of long testing cycles and high costs for single types of coking coal in existing technologies have been solved. This enables rapid and accurate quality evaluation of single types of coal in batches, making it suitable for rapid screening and quality control in coking production.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- HEILONGJIANG JIANLONG CHEM
- Filing Date
- 2026-03-24
- Publication Date
- 2026-05-12
AI Technical Summary
Existing methods for testing the post-reaction strength of single types of coking coal are time-consuming and costly, and cannot achieve batch testing, making it difficult to quickly screen and control the quality of raw coal in coking production.
Using standardized processing and high-temperature reaction testing methods, single types of coal are tested in batches through test containers, including crushing, loading, compaction, coking, quenching, weighing, and high-temperature reaction. The loss is calculated to evaluate the high-temperature reactivity of the coal.
It enables rapid batch testing, shortens the inspection cycle, reduces costs, and improves testing efficiency and accuracy. It can quickly obtain quality status data for single types of coal and is suitable for large-scale quality testing in coking production.
Smart Images
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Abstract
Description
Technical Field
[0001] This invention relates to a rapid method for evaluating the quality of a single type of coking coal by examining the loss amount after high-temperature reaction. Background Technology
[0002] In the coking process of steel enterprises, the post-reaction strength (CSR) of a single type of coking coal is a core indicator for evaluating the quality of that coal, directly determining the quality of the coking product and the subsequent blast furnace ironmaking efficiency. Current methods for testing the CSR of a single type of coking coal require smelting that coal alone in a test coke oven for up to 24 hours, followed by a series of CSR tests on the coke after smelting.
[0003] This traditional testing method has obvious technical defects: on the one hand, the testing cycle is too long, with the 24-hour coking process of a single type of coal occupying the main testing time, making it impossible to quickly obtain quality status data for a single type of coal, which greatly hinders the rapid screening and quality control of raw coal in coking production; on the other hand, the testing cost is high, as the method of coking a single type of coal cannot achieve batch testing, and only one type of coal sample can be tested per batch, resulting in high unit testing costs for equipment, energy, and labor, which is not conducive to the large-scale quality testing of coking raw coal by enterprises.
[0004] Therefore, developing a method for evaluating the quality of single types of coking coal that can perform batch testing, shorten the inspection cycle, reduce testing costs, and ensure the accuracy of test results has become an urgent technical problem to be solved in the coking production field of steel enterprises. Summary of the Invention
[0005] This invention provides a rapid method for evaluating the quality of a single type of coking coal by testing the loss after high-temperature reaction. It solves the problems of long cycle and high cost of existing testing methods, realizes batch-by-batch rapid testing of the high-temperature reactivity of single types of coal, and efficiently evaluates the coking performance of single types of coal, providing a fast and accurate basis for controlling the quality of raw materials in coking production.
[0006] The present invention provides a rapid method for evaluating the quality of a single type of coking coal by assessing the loss after high-temperature reaction, which is specifically carried out according to the following steps:
[0007] I. Standardized processing of raw coal: The coking coal to be tested is crushed and then the crushed coal sample is air-dried naturally.
[0008] II. Loading and Tamping: The treated coal sample is loaded into the test container, and the coal sample in the container is tamped.
[0009] III. Coking and Feeding: Place the test containers containing coal samples symmetrically in the coal box of the test coke oven to ensure uniform heating; then feed the coal box with the test containers into the test coke oven.
[0010] IV. Heating and Coking: In accordance with the conventional heating system of the test coke oven, the coal sample in the coal box is heated and coked to ensure the standardization of the coking process and to fully refine the coal sample into coke.
[0011] V. Quenching and Cooling: After coking is completed, the test sample is taken out of the coke oven and the coke is cooled and quenched by spraying water in small amounts multiple times.
[0012] VI. Coke block screening and weighing: The coke after quenching is crushed; the coke larger than 5mm is screened out using a standard sieve, and the coke after screening is weighed and the data is recorded as the initial weight of the coke.
[0013] VII. High-temperature reaction test: The sieved block coke is subjected to a high-temperature reaction test to simulate the high-temperature reaction environment of coke in actual production;
[0014] 8. Weighing after reaction: After the high-temperature reaction test is completed, take out the coke from the container, weigh the block coke after the reaction and record the data as the remaining weight of the coke.
[0015] IX. Loss Calculation and Quality Evaluation: Based on the initial weight and remaining weight of coke, calculate the loss amount and loss ratio of the single type of coal after high-temperature reaction; by comparing the loss data of different batches of the same type of coal, evaluate the high-temperature reactivity and coking quality of the single type of coal. The lower the loss amount, the better the high-temperature reactivity and the higher the coking quality of the single type of coal.
[0016] The beneficial effects of this invention are:
[0017] Compared with the prior art, the testing method of the present invention has the following significant effects and advantages:
[0018] This invention enables batch testing and significantly shortens the inspection cycle: By using customized special test containers, single types of coal are loaded into different containers and sent to the coke oven for coking in batches. This breaks the existing mode of coking single types of coal separately. It can test 8-16 types of single coal at a time, and at the same time eliminates the complicated coke block preparation process. The inspection cycle is significantly shortened compared with traditional methods, and the quality status data of single coal can be obtained quickly.
[0019] Reduce inspection costs and improve testing efficiency: Batch testing mode effectively reduces the unit testing costs of equipment, energy and labor, while simplifying operation steps, reducing manpower input in the testing process, and greatly improving the testing efficiency of single coal coking performance, which is suitable for enterprises to conduct large-scale quality testing of coking raw coal.
[0020] The testing process is standardized, and the results are accurate and reliable: This invention has established standardized parameters for key aspects such as coal sample crushing fineness, moisture content, compaction density, and quenching moisture. At the same time, it adopts industry-standard high-temperature reaction test equipment to ensure the consistency of testing conditions. The loss data obtained from the test can truly and accurately reflect the high-temperature reactivity of a single type of coal, providing a reliable basis for coking quality evaluation.
[0021] Simple and convenient to operate, highly practical: The test container of this invention is simple to manufacture and highly adaptable. The test steps are simple and easy to understand. No complicated professional operating skills are required. It can be directly implemented on the test coke oven of existing coking enterprises without the need for additional large-scale equipment modification. It has strong industrial practicality and promotion value.
[0022] Efficiently guides production and controls raw material quality: This invention can quickly evaluate the high-temperature reactivity and coking performance of a single type of coal. Coking enterprises can quickly screen qualified coking raw coal based on the test results, adjust the raw coal blending scheme in a timely manner, effectively control the quality of coking raw materials, and ensure the stable operation of coking production and the quality of coke products. Attached Figure Description
[0023] Figure 1 This is a schematic diagram of the structure of the test container used in this invention; Figure 1 In the middle: 1 is a 306L stainless steel pipe body (φ125mm, length 200mm), 2 is a 3mm thick stainless steel sealing base plate, and 3 is a stainless steel cover plate. Detailed Implementation
[0024] Specific Implementation Method 1: This implementation method provides a quick way to evaluate the quality of a single type of coking coal by testing the loss after high-temperature reaction. The method is carried out according to the following steps:
[0025] I. Standardized processing of raw coal: The coking coal to be tested is crushed and then the crushed coal sample is air-dried naturally.
[0026] II. Loading and Tamping: The treated coal sample is loaded into the test container, and the coal sample in the container is tamped.
[0027] III. Coking and Feeding: Place the test containers containing coal samples symmetrically in the coal box of the test coke oven to ensure uniform heating; then feed the coal box with the test containers into the test coke oven.
[0028] IV. Heating and Coking: In accordance with the conventional heating system of the test coke oven, the coal sample in the coal box is heated and coked to ensure the standardization of the coking process and to fully refine the coal sample into coke.
[0029] V. Quenching and Cooling: After coking is completed, the test sample is taken out of the coke oven and the coke is cooled and quenched by spraying water in small amounts multiple times.
[0030] VI. Coke block screening and weighing: The coke after quenching is crushed; the coke larger than 5mm is screened out using a standard sieve, and the coke after screening is weighed and the data is recorded as the initial weight of the coke.
[0031] VII. High-temperature reaction test: The sieved block coke is subjected to a high-temperature reaction test to simulate the high-temperature reaction environment of coke in actual production;
[0032] 8. Weighing after reaction: After the high-temperature reaction test is completed, take out the coke from the container, weigh the block coke after the reaction and record the data as the remaining weight of the coke.
[0033] IX. Loss Calculation and Quality Evaluation: Based on the initial weight and remaining weight of coke, calculate the loss amount and loss ratio of the single type of coal after high-temperature reaction; by comparing the loss data of different batches of the same type of coal, evaluate the high-temperature reactivity and coking quality of the single type of coal. The lower the loss amount, the better the high-temperature reactivity and the higher the coking quality of the single type of coal.
[0034] Specific Implementation Method Two: This implementation method differs from Specific Implementation Method One in that the single type of coking coal to be tested in step one is coking coal, fat coal, gas coal, 1 / 3 coke, or lean coal. Everything else is the same as in Specific Implementation Method One.
[0035] Specific Implementation Method Three: This implementation method differs from Specific Implementation Method One in that: in step one, the crushing process controls the proportion of particles smaller than 3mm in the coal sample to be above 90%; and the drying process controls the moisture content of the coal sample to be below 10%. Everything else is the same as in Specific Implementation Method One.
[0036] Specific Implementation Method Four: This implementation method differs from Specific Implementation Method One in that: the test container described in step two is made by cutting a 200mm length from a φ125mm 306L stainless steel pipe, sealing the bottom with a 3mm thick stainless steel plate, and fabricating a matching stainless steel cover plate to form a cylindrical test container; based on the actual volume of the test coke oven iron box, 8-16 of these test containers are mass-produced. Everything else is the same as in Specific Implementation Method One.
[0037] The test container has a cylindrical structure. The tube body 1 is welded to the sealing base plate 2 as one piece. The cover plate 3 can be matched and fastened to the end of the tube body 1. The whole material is 306L stainless steel, which is resistant to high temperature and deformation. It can be adapted to the placement space of the coal box of the test coke oven, ensuring the sealing and uniform heating of the coal sample during the coking process.
[0038] Specific Implementation Method Five: This implementation method differs from Specific Implementation Method One in that the tamping operation in step two controls the bulk density of the coal sample to reach 1.1 tons / m³. 3 Everything else is the same as in Specific Implementation Method 1.
[0039] Specific Implementation Method Six: This implementation method differs from Specific Implementation Method One in that: in step four, the coking heating rate is 1.0℃ / min; the coking coal charging temperature is 850℃; the constant temperature for coking is 1050℃; and the coking time is 18 hours. Everything else is the same as in Specific Implementation Method One.
[0040] Specific Implementation Method Seven: This implementation method differs from Specific Implementation Method One in that, in step five, the moisture content of the coke is controlled to be below 5% during the cooling and quenching process to ensure the integrity of the coke's physical form. Everything else is the same as in Specific Implementation Method One.
[0041] Specific Implementation Method Eight: This implementation method differs from Specific Implementation Method One in that the crushing process in step six involves crushing large pieces of coke (greater than 40mm) to below 40mm. Everything else is the same as in Specific Implementation Method One.
[0042] Specific Implementation Method Nine: This implementation method differs from Specific Implementation Method One in the following aspects: The process flow for the high-temperature reaction test in step seven is as follows: The electric furnace is heated at a rate of 8℃ / min to 16℃ / min; when the material layer temperature reaches 400℃, nitrogen gas is introduced at a flow rate of 0.8L / min; when the material layer temperature reaches 1100℃, it is stabilized for 10 minutes, then the nitrogen gas is cut off, and carbon dioxide is introduced at a flow rate of 5L / min; the start time of the reaction is recorded; after the carbon dioxide is introduced, the material layer temperature recovers to 1100℃ ± 3℃ within 5 to 10 minutes; the reaction is carried out for 2 hours, heating is stopped, carbon dioxide is cut off, and nitrogen gas is introduced at a flow rate of 2L / min; the reaction is discharged from the furnace, and under nitrogen protection, the temperature drops below 100℃, then the nitrogen gas supply is stopped, and the high-temperature reaction test ends. Everything else is the same as in Specific Implementation Method One.
[0043] The technical effects of the present invention are verified through the following embodiments:
[0044] This embodiment provides a quick method for evaluating the quality of a single type of coking coal by examining the loss after high-temperature reaction. The specific implementation steps are as follows:
[0045] I. Standardized processing of raw coal: The coking coal to be tested is pulverized, and then the pulverized coal samples are laid flat in a ventilated place to air dry naturally. The moisture content of the coal samples is measured in real time using a moisture analyzer, and the moisture content of the coal samples is below 10%. The pulverization process controls the proportion of fine particles smaller than 3mm in the coal samples to be above 90%. The coking coal to be tested is coking coal, fat coal, gas coal, 1 / 3 coke, or lean coal.
[0046] II. Loading and Tamping: The treated coal sample is loaded into the test container, and the coal sample inside the container is tamped. A φ125mm 306L stainless steel pipe is selected, and a 200mm section of the pipe is cut using a cutting machine. A 3mm thick 306L stainless steel plate is welded to the bottom of the pipe to ensure a seamless weld. At the same time, a cover plate of the same material is made to match the pipe end, forming a cylindrical test container. The tamping operation described in step II controls the bulk density of the coal sample to reach 1.1 tons / m³. 3 ;
[0047] III. Coking and Feeding: Place the test containers containing coal samples symmetrically in the coal box of the test coke oven to ensure uniform heating; then feed the coal box with the test containers into the test coke oven.
[0048] IV. Heating and Coking: Following the conventional heating system of the test coke oven, the coal sample in the coal box was heated and coked to ensure the standardization of the coking process and to fully refine the coal sample into coke; coking heating rate: 1.0℃ / min; coking coal charging temperature: 850℃; coking constant temperature: 1050℃; coking time: 18h.
[0049] V. Quenching and Cooling: After coking is completed, the test sample is taken out of the coke oven and the coke is cooled and quenched by spraying water in small amounts and multiple times. The moisture content of the coke is controlled to be below 5% during quenching and cooling to ensure the integrity of the physical form of the coke.
[0050] VI. Coke block screening and weighing: After coke is quenched, the coke is crushed, and large pieces of coke larger than 40mm are crushed to less than 40mm; the coke larger than 5mm is screened out using a standard sieve, and the coke after screening is weighed and the data is recorded as the initial weight of coke M1.
[0051] VII. High-Temperature Reaction Test: The sieved block coke was subjected to a high-temperature reaction test to simulate the high-temperature reaction environment of coke in actual production. The process flow for the high-temperature reaction test was as follows: The electric furnace was heated at a rate of 8℃ / min to 16℃ / min. When the material bed temperature reached 400℃, nitrogen gas was introduced at a flow rate of 0.8L / min. When the material bed temperature reached 1100℃, it was stabilized for 10 minutes, then the nitrogen gas was cut off, and carbon dioxide was introduced at a flow rate of 5L / min. The start time of the reaction was recorded. After the introduction of carbon dioxide, the material bed temperature should recover to 1100℃ ± 3℃ within 5 to 10 minutes. The reaction was carried out for 2 hours, then heating was stopped, the carbon dioxide was cut off, and nitrogen gas was introduced at a flow rate of 2L / min. After the reaction was discharged from the furnace, the temperature was lowered to below 100℃ under nitrogen protection. The nitrogen gas supply was then stopped, and the high-temperature reaction test was completed.
[0052] 8. Weighing after reaction: After the high-temperature reaction test is completed, take out the coke from the container, weigh the block coke after the reaction and record the data as the remaining weight of coke M2.
[0053] IX. Loss Calculation and Quality Evaluation: Based on the initial weight and remaining weight of coke, calculate the loss amount and loss ratio of the single type of coal after high-temperature reaction; by comparing the loss data of different batches of the same type of coal, evaluate the high-temperature reactivity and coking quality of the single type of coal. The lower the loss amount, the better the high-temperature reactivity and the higher the coking quality of the single type of coal.
[0054] Loss calculation: Calculate the high-temperature reaction loss and loss ratio of a single type of coal coke according to the formula. Loss = M1 - M2, loss ratio = (M1 - M2) / M1 × 100%.
[0055]
[0056] In actual coal blending production, during the single-coal quality evaluation and tracking period using the LM prime coke sampling method, when the weight loss ratio was 22-25% and the blending ratio was 15%, the coke strength (CSR) reached 60-65%. During this period, there was one instance where the weight loss ratio increased to 28%, and the coke strength (CSR) decreased to 58%. Subsequently, by adjusting the production blending ratio, reducing the LM prime coke blending ratio to 10%, and increasing the XL prime coke blending ratio of the same quality by 5%, the coke strength (CSR) recovered to between 60-65%.
Claims
1. A rapid method for evaluating the quality of a single type of coking coal by examining the loss after high-temperature reaction, characterized in that... A quick method for evaluating the quality of a single type of coking coal after high-temperature reaction is as follows: I. Standardized processing of raw coal: The coking coal to be tested is crushed and then the crushed coal sample is air-dried naturally. II. Loading and Tamping: The treated coal sample is loaded into the test container, and the coal sample in the container is tamped. III. Coking and Feeding: Place the test containers containing coal samples symmetrically in the coal box of the test coke oven to ensure uniform heating; then feed the coal box with the test containers into the test coke oven. IV. Heating and Coking: In accordance with the conventional heating system of the test coke oven, the coal sample in the coal box is heated and coked to ensure the standardization of the coking process and to fully refine the coal sample into coke. V. Quenching and Cooling: After coking is completed, the test sample is taken out of the coke oven and the coke is cooled and quenched by spraying water in small amounts multiple times. VI. Screening and weighing of coke blocks: The coke after quenching is crushed. The coke larger than 5mm was screened out using a standard sieve. The coke after screening was weighed and the data was recorded as the initial weight of the coke. VII. High-temperature reaction test: The sieved block coke is subjected to a high-temperature reaction test to simulate the high-temperature reaction environment of coke in actual production; 8. Weighing after reaction: After the high-temperature reaction test is completed, take out the coke from the container, weigh the block coke after the reaction and record the data as the remaining weight of the coke. IX. Loss Calculation and Quality Evaluation: Based on the initial weight and remaining weight of coke, calculate the loss amount and loss ratio of the single type of coal after high-temperature reaction; by comparing the loss data of different batches of the same type of coal, evaluate the high-temperature reactivity and coking quality of the single type of coal. The lower the loss amount, the better the high-temperature reactivity and the higher the coking quality of the single type of coal.
2. The rapid method for evaluating the quality of a single type of coking coal by examining the loss after high-temperature reaction, as described in claim 1, is characterized in that... The single type of coking coal to be tested in step one is coking coal, fat coal, gas coal, 1 / 3 coke or lean coal.
3. A rapid method for evaluating the quality of a single type of coking coal by examining the loss after high-temperature reaction, as described in claim 1, is characterized in that... In step one, the crushing process involves controlling the proportion of particles smaller than 3mm in the coal sample to be above 90%; and the drying process controls the moisture content of the coal sample to be below 10%.
4. A rapid method for evaluating the quality of a single type of coking coal by examining the loss after high-temperature reaction, as described in claim 1, is characterized in that... The test container described in step two is made by cutting a 200mm length from a φ125mm 306L stainless steel pipe, sealing the bottom with a 3mm thick stainless steel plate, and making a matching stainless steel cover plate to form a cylindrical test container; according to the actual volume of the test coke oven iron box, 8-16 of these test containers are produced in batches.
5. A rapid method for evaluating the quality of a single type of coking coal by examining the loss after high-temperature reaction, as described in claim 1, is characterized in that... The tamping operation described in step two controls the bulk density of the coal sample to reach 1.1 tons / m³. 3 .
6. A rapid method for evaluating the quality of a single type of coking coal by examining the loss after high-temperature reaction, as described in claim 1, is characterized in that... In step four, the heating rate of coking is 1.0℃ / min; the coal charging temperature for coking is 850℃; the constant temperature for coking is 1050℃; and the coking time is 18h.
7. A rapid method for evaluating the quality of a single type of coking coal by testing the loss after high-temperature reaction, as described in claim 1, is characterized in that... In step five, cooling and quenching the coke controls the moisture content of the coke to be below 5%, ensuring the integrity of the coke's physical form.
8. A rapid method for evaluating the quality of a single type of coking coal by examining the loss after high-temperature reaction, as described in claim 1, is characterized in that... The crushing process described in step six involves crushing large pieces of coke larger than 40mm to less than 40mm.
9. A rapid method for evaluating the quality of a single type of coking coal by examining the loss after high-temperature reaction, as described in claim 1, is characterized in that... The process flow for the high-temperature reaction test in step seven is as follows: The electric furnace is heated at a rate of 8℃ / min to 16℃ / min. When the material layer temperature reaches 400℃, nitrogen is introduced at a flow rate of 0.8L / min. When the material layer temperature reaches 1100℃, it is stabilized for 10 minutes, then the nitrogen is cut off, and carbon dioxide is introduced at a flow rate of 5L / min. The start time of the reaction is recorded. After the carbon dioxide is introduced, the material layer temperature recovers to 1100℃ ± 3℃ within 5 to 10 minutes. The reaction is carried out for 2 hours, then heating is stopped, the carbon dioxide is cut off, and nitrogen is introduced at a flow rate of 2L / min. The reaction is then carried out of the furnace, and the temperature drops below 100℃ under nitrogen protection. Nitrogen is then stopped, and the high-temperature reaction test is completed.