Metallurgy automobile transportation coke manual sampling method

Abstract

The invention relates to a manual sampling method for metallurgical automobile-transported coke, which comprises the following steps of: in the whole unloading process, respectively sampling at three nodes of unloading start, unloading and unloading completion, screening and calculating the coke breeze mass percentage of a sample taken at each node, and recording the size fraction mass; summarizing the three-node data to obtain the overall coke breeze mass percentage; repeating the process to obtain multiple groups of data; deducing the sampling mass percentage of the three nodes by taking the actual content as the reference; and sampling as required according to the mass percent. Through scientific tests and data accumulation, the problem of inaccurate coke breeze content sampling is solved; according to the method, all steps of automobile transportation and unloading are covered, three key nodes are selected for sampling, and the problem that the coke breeze content is low in a traditional sampling mode is effectively avoided; and the mass percent of the sample required by each part is inversely calculated through a calculation formula, so that the representativeness and the accuracy of sampling data are ensured.

Description

Technical Field

[0001] The invention relates to the technical field of coke inspection and testing system process, in particular to an artificial sampling method for metallurgical truck-transported coke. Background Art

[0002] Coke is an indispensable bulk fuel for long-process steel enterprises, and is the bulk of the raw and auxiliary fuel procurement costs before ironmaking. The coke procurement settlement items generally include: moisture, ash, volatile matter, total sulfur, M25, M40, M10, CSR, CRI and other industrial analysis items, and the most important is its coke content (mass percentage of particles less than 25mm). The settlement price of coke is 40% of the coke settlement price. Therefore, for steel enterprises, it is critical to obtain representative samples. The content of coke directly determines the settlement price.

[0003] Coke transportation is generally divided into: shipping, rail and truck. More and more steel companies choose to automatically sample coke on the belt during unloading to obtain more representative samples. However, truck transportation still has the problem of relying on manual sampling due to equipment failure, sampling condition restrictions, equipment cost and other factors.

[0004] However, manual sampling by automobile transportation has the following defects:

[0005] 1. During transportation, the coke in the container is often not present on the surface due to the small particle size of the coke dust (<25mm) affected by gravity and other factors. Its quality level cannot be judged by the naked eye and it is difficult to obtain representative samples.

[0006] 2. After unloading, the truck-transported coke is piled up on the site to form a conical material pile. Manual sampling can only obtain samples from the surface and slightly inside, but not from the core. The sampling is not representative.

[0007] Therefore, after actual data comparison, the coke content of manual sampling is much lower than that of automatic sampling. Currently, there is no standard regulation for manual sampling of coke. Summary of the invention

[0008] The technical problem to be solved by the present invention is to provide a manual sampling method for metallurgical truck-transported coke, which can cover the entire unloading process, avoid the deviation of coke content, ensure data accuracy, and make the operation replicable, which has promotion value.

[0009] The technical solution adopted by the present invention to solve the technical problem is: a method for manually sampling metallurgical truck-transported coke, comprising the following steps:

[0010] S1. When unloading begins and the container rear door is opened and the coke stops falling, sampling of node a begins. The sampling method is: sampling is carried out at the left, middle and right points 50 cm above the height of the carriage, and fixed-point sampling is carried out using a sampling shovel.

[0011] S2. The sampling personnel evacuate to a safe position, continue to command the sampling vehicle to lift the carriage to a 45-degree angle and stop, wait for the coke to fall completely, and start sampling the b node part; the sampling method is: arrange points on the left, middle and right at a height of 100 cm from the carriage, and use a sampling shovel to sample at fixed points;

[0012] S3. After the sampling vehicle has finished unloading, the sampling of the c node part begins. The sampling method is: when the material pile is more than 50 cm above the ground, the left, middle and right points are arranged and the sampling shovel is used for fixed-point sampling.

[0013] S4. Screen the samples taken from the three nodes a, b and c respectively, calculate the mass percentage of the coke residue in each part and record the mass of each particle size;

[0014] S5. Summarize the coke dust data of the three nodes a, b, and c, add the masses of particles with the same diameter, and obtain the mass percentage of the coke dust of the entire sample;

[0015] S6. Screen the entire corresponding container coke and calculate the actual mass percentage of coke residue according to the mass;

[0016] S7. Repeat steps S4 to S6 for different truck-transported coke containers to obtain several sets of data. Take the actual content of coke dust in the entire container as a benchmark and combine the percentage of coke dust in each part of the three nodes a, b, and c in the entire sampling sample; reversely deduce the mass percentage of samples to be taken at each node a, b, and c to obtain the sampling mass percentage of each node a, b, and c: M%a+N%b+Q%c, where M, N, and Q are constants;

[0017] S8. According to the mass percentage in step S7, sampling is performed according to the actual required sample mass.

[0018] Furthermore, in step S1 of the present invention, before sampling, the sampling tool is cleaned 2-3 times with the sample to be sampled.

[0019] Furthermore, in step S1 of the present invention, the left, middle and right point distribution methods are: the left is 10 cm from the left compartment, the middle is the middle part of the compartment, and the right is 10 cm from the right compartment.

[0020] Furthermore, in step S2 of the present invention, the left, middle and right distribution methods are: the left is 10 cm from the left compartment, the middle is the middle of the compartment, and the right is 10 cm from the right compartment.

[0021] Furthermore, in step S4 of the present invention, the mass percentage of the coke residue in each part is less than 25 mm; and the particle sizes of each particle size are 25-40 mm, 40-60 mm, 60-80 mm, and >80 mm, respectively.

[0022] The beneficial effects of the present invention are that the defects existing in the background technology are solved.

[0023] 1. In the absence of relevant coke sampling standards, an objective and scientific method for manual sampling of road-transported coke was obtained through experiments, data accumulation and calculation.

[0024] 2. This manual sampling method covers all steps in the process of truck unloading, and by selecting and setting the three step nodes a / b / c, it better avoids the problem of being unable to obtain actual coke content samples during the truck coke unloading process. It has strong sampling representativeness and operational replicability.

[0025] 3. Through data accumulation and reagent data verification, the mass percentage of samples required for each part was calculated by reverse calculation formula, and the mass taken in each specific step was innovatively obtained; the problem of low coke content caused by average sampling of each part was avoided, and the coke data obtained by the sampling method was consistent with the actual coke data.

[0026] 4. This method has strong promotion value and is suitable for manual sampling of coke transported by truck in long-process steel enterprises. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] Figure 1 It is a comparison diagram between the manual sampling method and the automatic sampling method in the prior art. DETAILED DESCRIPTION

[0028] The present invention will now be described in further detail in conjunction with the accompanying drawings and preferred embodiments. These drawings are simplified schematic diagrams, which only illustrate the basic structure of the present invention in a schematic manner, and therefore only show the components related to the present invention.

[0029] A manual sampling method for metallurgical truck-transported coke is used to improve the existing sampling method. The coke content after the improvement is compared with that before the sampling method is improved and compared with the automatic sampling data. Figure 1 shown.

[0030] The specific steps are as follows:

[0031] (1) The unloading process of truck-transported coke is divided into three nodes: a. The truck container opens the silo at the beginning of unloading; b. The container is lifted up 45 degrees during the unloading process; c. The conical material pile is stored in the material yard after the unloading is completed. These three components correspond to the beginning of unloading, unloading, and unloading completion, covering the entire unloading process.

[0032] (2) Use sampling tools (in accordance with the requirements of Section 5.1 of GB / T1997-2018) at the three nodes a / b / c to take samples of corresponding mass, approximately 100 kg each.

[0033] At node a, instruct the driver of the vehicle to be picked up to open the rear door of the container. When the coke stops falling, start sampling. Before sampling, clean the sampling tool 2-3 times with the sample to be picked up. Use the sampling shovel to arrange points on the left, middle and right about 50 cm above the height of the carriage (the left is 10 cm from the left carriage, the middle is the middle of the carriage, and the right is 10 cm from the right carriage). Use the sampling shovel to take samples at fixed points;

[0034] At node b, the sampling personnel evacuated to a safe location and continued to direct the sampling vehicle to lift the carriage, and stopped at about 45 degrees (about half of the unloading). After the coke fell completely, sampling was carried out at the left, middle and right points about 100 cm from the height of the carriage (the left is 10 cm from the left carriage, the middle is the middle part of the carriage, and the right is 10 cm from the right carriage). Use a sampling shovel to take samples at fixed points;

[0035] At node c, the sampling vehicle has finished unloading, and the sampling shovel is used to take samples at fixed points on the left, middle and right sides of the pile at least 50 cm above the ground;

[0036] (3) Screen the three parts of samples a, b, and c respectively, calculate the mass percentage of coke residue in each part (<25 mm) and record the mass of each particle size (25-40 mm, 40-60 mm, 60-80 mm, >80 mm).

[0037] (4) The coke dust data of parts a, b, and c are summarized, and the masses of particles with the same particle size are added together to obtain the mass percentage of coke dust of the entire sample (<25 mm).

[0038] (5) The entire corresponding container coke (about 20t) is screened and the actual mass percentage of coke dust (<25mm) is calculated based on the mass.

[0039] (6) Repeat steps 3 to 5 for different truck-transported container cokes to obtain several sets of data, including:

[0040] The coke content (%) of node a, node a accounts for % of the coke content of the entire sample; the coke content (%) of node b, node b accounts for % of the coke content of the entire sample; the coke content (%) of node c, node c accounts for % of the coke content of the entire sample; and the actual coke content of the entire sample in the container.

[0041] The test data are shown in the following table (Table 1):

[0042]

[0043]

[0044] The total coke content of the three batches of data in the above table (Table 1) is: 8.65%, 4.66% and 5.75%. From the test data, the coke content of the two parts of the top 45° and the ground is relatively consistent, accounting for about 1.60% of the total coke content.

[0045] The screening coke data of the whole vehicle of samples in tests 1 to 3 is 6.97%.

[0046] (7) Based on the actual content of coke in the entire container, combined with the percentage of coke in each part of steps a, b, and c in the entire sample, the mass percentage of samples required for each step a, b, and c is reversed to obtain the mass percentage of samples in each step a, b, and c: 40% a + 30% b + 30% c.

[0047] Calculation process: the average value of coke dust sampled at the opening of the warehouse is 13.93%. If 45% of the mass is sampled at the opening of the warehouse, the content of coke dust sampled at the opening of the warehouse is: 13.93%*0.45=6.27%; the sum of the coke dust on the ground and at 45° accounts for 1.6% of the total sample, and the sample mass accounts for about 66% of the total mass. If the warehouse is opened at 45%, there will be 55% left, then this part of coke dust = 1.6%*0.55 / 0.66=1.33%.

[0048] Total coke content = 6.27% + 1.33% = 7.60%;

[0049] The average value of coke dust sampled at the opening of the warehouse is 13.93%. If 40% of the mass is sampled at the opening of the warehouse, the content of coke dust sampled at the opening of the warehouse is: 13.93%*0.4=5.57%; the sum of the coke dust at the ground and 45° accounts for 1.6% of the total sample, and the sample mass accounts for about 66% of the total mass. If the warehouse is opened at 40%, there will be 60% left, then this part of coke dust = 1.6%*0.6 / 0.66=1.45%.

[0050] Total coke content = 5.57% + 1.45% = 7.02%;

[0051] Therefore, the sampling method is determined as follows: 40% open warehouse + 30% lifted 45° + 30% grounded, with a total sample volume of 300kg.

[0052] According to the mass percentage in step 7, sampling is carried out according to the actual required sample mass: if the total sample volume is 300kg, 120kg is taken in step a, and 90kg is taken in step b / c respectively.

[0053] The above description only describes the specific implementation mode of the present invention. Various examples do not limit the essential content of the present invention. After reading the description, ordinary technicians in the relevant technical field can modify or deform the specific implementation modes described above without departing from the essence and scope of the invention.

Claims

1. A method for manual sampling of metallurgical coke transported by steam, characterized in that: The following steps are included: S1. When unloading begins and the container rear door is opened and the coke stops falling, sampling of node a begins. The sampling method is: sampling is carried out at the left, middle and right points 50 cm above the height of the carriage, and fixed-point sampling is carried out using a sampling shovel. S2. The sampling personnel evacuate to a safe position, continue to command the sampling vehicle to lift the carriage to a 45-degree angle and stop, wait for the coke to fall completely, and start sampling the b node part; the sampling method is: arrange points on the left, middle and right at a height of 100 cm from the carriage, and use a sampling shovel to sample at fixed points; S3. After the sampling vehicle has finished unloading, the sampling of the c node part begins. The sampling method is: when the material pile is more than 50 cm above the ground, the left, middle and right points are arranged and the sampling shovel is used for fixed-point sampling. S4. Screen the samples taken from the three nodes a, b and c respectively, calculate the mass percentage of the coke residue in each part and record the mass of each particle size; S5. Summarize the coke dust data of the three nodes a, b, and c, add the masses of particles with the same diameter, and obtain the mass percentage of the coke dust of the entire sample; S6. Screen the entire corresponding container coke and calculate the actual mass percentage of coke residue according to the mass; S7. Repeat steps S4 to S6 for different truck-transported coke containers to obtain several sets of data. Take the actual content of coke dust in the entire container as a benchmark and combine the percentage of coke dust in each part of the three nodes a, b, and c in the entire sampling sample; reversely deduce the mass percentage of samples to be taken at each node a, b, and c to obtain the sampling mass percentage of each node a, b, and c: M%a+N%b+Q%c, where M, N, and Q are constants; S8. According to the mass percentage in step S7, sampling is performed according to the actual required sample mass.

2. A method for manually sampling metallurgical coke transported by steam as claimed in claim 1, characterized in that: In the step S1, before sampling, the sampling tool is cleaned 2-3 times with the sample to be sampled.

3. A method for manually sampling metallurgical coke transported by steam as claimed in claim 1, characterized in that: In step S1, the left, middle and right points are arranged as follows: the left is 10 cm from the left compartment, the middle is the middle of the compartment, and the right is 10 cm from the right compartment.

4. A method for manual sampling of metallurgical coke transported by steam as claimed in claim 1, characterized in that: In step S2, the left, middle and right points are arranged as follows: the left is 10 cm from the left compartment, the middle is the middle of the compartment, and the right is 10 cm from the right compartment.

5. A method for manual sampling of metallurgical coke transported by steam transport as claimed in claim 1, characterized in that: In step S4, the mass percentage of the coke residue in each part is less than 25 mm; and the particle sizes of each particle size are 25-40 mm, 40-60 mm, 60-80 mm, and >80 mm respectively.

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