Method for detecting drying uniformity of coal material through coal moisture control and coal preheating
Through the methods of stratified sampling and temperature detection, the problem of coal drying uniformity detection was solved, and accurate evaluation and process optimization of coal drying uniformity were achieved, thus reducing energy consumption and improving coke oven production efficiency and coke quality.
Patent Information
- Application Number
- CN202510765922.X
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2025-06-10
- Publication Date
- 2025-09-05
AI Technical Summary
At present, there is a lack of effective methods to detect the drying uniformity of coal during the process of moisture adjustment, drying or preheating, which leads to uneven moisture content and affects industrial production efficiency, safety, economic benefits and environmental protection.
The method of layered zoning sampling and temperature detection is adopted. Sampling points are selected at equal intervals on the surface of the coal, the moisture difference and temperature difference are detected, the drying uniformity of the coal is judged, the sampling area is divided into three-dimensional spaces, and the temperature is measured using an infrared temperature gun or thermal imager.
It improves sample representativeness, accurately detects the drying uniformity of coal materials, guides process optimization, reduces energy consumption, avoids local overheating and spontaneous combustion, and improves coke oven operating efficiency and coke quality.
Smart Images
Figure CN120594791A_ABST
Abstract
Description
Technical Field
[0001] The present invention relates to the technical field of coal drying uniformity detection, in particular to a method for detecting coal drying uniformity during coal moisture adjustment and coal preheating. Background Art
[0002] During transportation, storage, and stacking, coal particles of varying sizes can segregate, and gravity can cause higher moisture levels in the middle and bottom layers. During coal moisture conditioning, drying, or preheating, varying heat sources, direct or indirect heating methods, particle size, distance from the heat source, or uneven bed thickness can all lead to uneven moisture content within the same dried material.
[0003] The importance of coal drying uniformity testing is reflected in many key areas, directly affecting industrial production efficiency, safety, economic benefits, product quality and environmental protection. (1) It can be used as one of the evaluation indicators for different coal moisture control, coal drying or coal preheating effects, so as to select a more suitable coal moisture control, coal drying or coal preheating process through comparison, and at the same time create conditions for significantly reducing the heat supply of coal in the coke oven; (2) It can be used as a basis for adjusting the number, distribution and process parameters of heat source points in the coal moisture control, coal drying or coal preheating process, thereby reducing the energy consumption of coal drying; (3) It can prevent safety risks. Unevenly dried coal piles may cause spontaneous combustion due to local overheating; (4) It provides a reference for the heat supply of subsequent coal in the coke oven, avoiding quality problems such as immature coke due to uneven coal moisture content, and also generating environmental risks such as yellow smoke or black smoke.
[0004] At present, there is no effective method to detect the uniformity of coal drying. How to detect the uniformity of coal drying has become a technical problem that needs to be solved in this field. Summary of the Invention
[0005] In order to overcome the deficiencies of the prior art, the present invention provides a method for detecting the drying uniformity of coal material during coal moisture adjustment and coal preheating, which can detect the drying uniformity of coal material.
[0006] In order to achieve the above object, the present invention adopts the following technical solutions:
[0007] A method for detecting coal drying uniformity during coal moisture control and coal preheating, comprising the following steps:
[0008] S1: Mix the coal;
[0009] S2: Select sampling points at equal distances on the upper surface of the coal, and take samples a1, a2, a3, a4...a n ;
[0010] S3: Detect a1, a2, a3, a4...a n Moisture content of sample coal: if the maximum moisture difference is >1.5%, the coal is not dried evenly;
[0011] S4: If the maximum moisture difference is ≤1.5%, the coal is divided into layers and zones, with N1 sampling points set at equal distances in the X direction, N2 sampling points set at equal distances in the Y direction, and N3 sampling points set at equal distances in the Z direction, for a total of (N1-1)×(N2-1)×(N3-1) sampling zones;
[0012] S5: Select sampling areas in the middle and lower layers of coal, take a sample in each sampling area, and take samples b1, b2, b3, b4...b n ;
[0013] S6: When taking out the sample, measure the sample temperature, which are T1, T2, T3, T4...T n ;
[0014] S7: Detect b1, b2, b3, b4...b n Moisture content of sample coal: if the maximum moisture difference is >1.5%, the coal is not dried evenly;
[0015] If the maximum moisture difference is ≤1.5%, and the maximum temperature difference between the coal samples is greater than the set value, the coal drying is relatively uneven;
[0016] If the maximum moisture difference is ≤1.5% and the maximum temperature difference detected between coal samples is less than the set value, the coal is dried relatively evenly.
[0017] Furthermore, in S2, 1 to 20 cm of the upper epidermis is removed, and then a sample is taken.
[0018] Furthermore, in S5, a coal sampler is used to take samples in each sampling area.
[0019] Furthermore, in S6, an infrared temperature measuring gun or a thermal imager is used to detect the temperature of the sample.
[0020] Furthermore, in S7, if the maximum moisture difference is ≤1.5% and the maximum temperature difference detected between the coal samples is >20-50°C, the coal material is relatively unevenly dried.
[0021] Furthermore, in S7, if the maximum moisture difference is ≤1.5%, and the maximum temperature difference detected between the coal samples is <20-50°C, the coal material is dried relatively evenly.
[0022] Compared with the existing method, the present invention has the following beneficial effects:
[0023] 1. After coal moisture adjustment, coal drying or coal preheating, the coal material is layered and zoned according to its shape during drying. It is divided into (N1-1)×(N2-1)×(N3-1) sampling areas according to length (X direction), width (Y direction) and height (Z direction). The sampling points are evenly distributed in three-dimensional space to improve the representativeness of the sample.
[0024] 2. The present invention is divided into two levels of detection, and the temperature of the coal sample is detected in the latter detection, which effectively reduces the sampling amount and detection workload, and can also accurately detect the drying uniformity of the coal material.
[0025] 3. The coal drying effects obtained by different coal moisture control, coal drying or coal preheating methods can be evaluated and compared, the upper and lower limits of operating parameters can be calibrated, and it can be used as a basis for adjusting the number, distribution and process parameters of heat source points in the coal moisture control, coal drying or coal preheating process, thereby reducing the energy consumption of coal drying; it can avoid the phenomenon of local coal overheating causing spontaneous combustion, and also provide a reference for the heat supply required for the coal in the next step of the coke oven distillation process.
[0026] 4. The present invention mixes the coal before moisture adjustment, drying or preheating to avoid interference with subsequent detection and analysis.
[0027] By detecting coal drying uniformity, this method can guide the optimization and improvement of coal moisture control, coal drying, or coal preheating process systems, thereby improving the heat consumption of coke ovens. Testing coal drying uniformity achieves process optimization and energy conservation through the following pathways: precise control of moisture and temperature to reduce ineffective heat loss; shortening the coking cycle to improve coke oven operating efficiency; and collaboratively optimizing pretreatment processes to reduce overall system energy consumption. This process not only reduces coking heat consumption but also improves coke quality and extends equipment life, forming a virtuous cycle of "energy conservation, cost reduction, and quality improvement." BRIEF DESCRIPTION OF THE DRAWINGS
[0028] Figure 1 This is a schematic diagram of Example 1 of the present invention.
[0029] Figure 2 This is a schematic diagram of Example 2 of the present invention.
[0030] Figure 3 This is a schematic diagram of Example 3 of the present invention.
[0031] In the formula: 1, a1 sampling point; 2, a2 sampling point; 3, a3 sampling point; 4, a4 sampling point; 5, a5 sampling point; 6, coal bunker; 7, heat source; 8, b1 sampling point; 9, b2 sampling point; 10, b3 sampling point; 11, b4 sampling point; 12, b5 sampling point; 13, b6 sampling point. DETAILED DESCRIPTION
[0032] The present invention discloses a method for coal moisture control, coal preheating and coal drying uniformity detection. Those skilled in the art can refer to the content of this article and appropriately improve the process parameters to achieve the desired effect. It should be noted that all similar substitutions and modifications are obvious to those skilled in the art and are considered to be included in the present invention. The method and application of the present invention have been described through preferred embodiments, and relevant personnel can obviously modify or appropriately change and combine the method and application described herein without departing from the content, spirit and scope of the present invention to implement and apply the technology of the present invention.
[0033] A method for detecting coal drying uniformity during coal moisture control and coal preheating, comprising the following steps:
[0034] S1: Before coal moisture adjustment, coal drying or coal preheating, the coal material is mixed.
[0035] S2: Select 2 to 8 sampling points at equal intervals on the upper surface of the coal material along the distance from the heat source equipment, remove the upper surface skin of 1 to 20 cm, and take samples a1, a2, a3, a4...a8.
[0036] S3: Detect the moisture content of coal samples a1, a2, a3, a4...a8. If the maximum moisture difference is greater than 1.5%, the coal is not dried evenly.
[0037] S4: If the maximum moisture difference is ≤1.5%, the coal is divided into layers and zones, with N1 sampling points set at equal distances in the X direction, N2 sampling points set at equal distances in the Y direction, and N3 sampling points set at equal distances in the Z direction, for a total of (N1-1)×(N2-1)×(N3-1) sampling zones.
[0038] S5: 3 to 8 sampling areas are staggered in the middle and lower layers of the coal material, and samples are taken from each sampling area using a coal sampler, namely, samples b1, b2, b3, b4...b8.
[0039] S6: When taking out the sample, use an infrared temperature gun or thermal imager to measure the sample temperature, which are T1, T2, T3, T4...T8 respectively.
[0040] S7: Detect the moisture content of coal samples b1, b2, b3, b4...b8. If the maximum moisture difference is greater than 1.5%, the coal material is unevenly dried.
[0041] Example 1:
[0042] like Figure 1 As shown, a method for detecting the uniformity of coal drying during coal moisture control and coal preheating includes the following steps:
[0043] 1. Before coal moisture adjustment, coal drying or coal preheating, the coal material should be mixed to avoid interference with subsequent detection and analysis.
[0044] 2. For the coal samples after moisture adjustment, coal drying or coal preheating, select a1 sampling point 1, a2 sampling point 2, and a3 sampling point 3 in the coal bunker 6 according to the distance from the heat source 7, take coal samples a1, a2, and a3, and then test the moisture content of coal samples a1, a2, and a3 in turn: 1.32%, 4.67%, and 8.67% respectively.
[0045] 3. The moisture content of the coal samples was tested. The maximum difference between the moisture test results was 7.35%, so it was judged that the coal was unevenly dried.
[0046] Example 2:
[0047] like Figure 2 As shown, a method for detecting the uniformity of coal drying during coal moisture control and coal preheating includes the following steps:
[0048] 1. Before coal moisture adjustment, coal drying or coal preheating, the coal material should be mixed to avoid interference with subsequent detection and analysis.
[0049] 2. For the coal samples after moisture adjustment, coal drying or coal preheating, select a1 sampling point 1, a2 sampling point 2, a3 sampling point 3, a4 sampling point 4, and a5 sampling point 5 in the coal bunker 6 according to the distance from the heat source 7, take coal samples a1, a2, a3, a4, and a5, and then test the moisture content of coal samples a1, a2, a3, a4, and a5 in turn, and the moisture content is 6.32%, 6.37%, 6.67%, 5.92%, and 6.82% respectively.
[0050] 3. Detect the moisture content of the coal samples at these 5 points. The maximum difference between the moisture test results is 0.90%. Continue to divide the coal into layers and zones. Set 5 sampling points at equal distances in the X direction, 6 sampling points at equal distances in the Y direction, and 6 sampling points at equal distances in the Z direction, for a total of 100 sampling areas. Select 5 sampling areas in the middle and lower layers of the coal, and select b1 sampling point 8, b2 sampling point 9, b3 sampling point 10, b4 sampling point 11, and b5 sampling point 12. Use a coal sampler to take a sample at each sampling point: b1, b2, b3, b4, and b5.
[0051] 4: When taking out samples with the coal sampler, immediately use an infrared temperature measuring gun to detect the sample temperatures T1, T2, T3, T4, and T5.
[0052] 5: Detect the moisture content of coal samples b1, b2, b3, b4, and b5: 7.32%, 6.97%, 7.67%, 9.92%, and 10.82%. If the maximum moisture difference is >3.85%, the coal material is unevenly dried.
[0053] Example 3:
[0054] like Figure 3As shown, a method for detecting the uniformity of coal drying during coal moisture control and coal preheating includes the following steps:
[0055] 1. Before coal moisture adjustment, coal drying or coal preheating, the coal material should be mixed to avoid interference with subsequent detection and analysis.
[0056] 2. For the coal samples after moisture adjustment, coal drying or coal preheating, select a1 sampling point 1, a2 sampling point 2, a3 sampling point 3, and a4 sampling point 4 in the coal bunker 6 according to the distance from the heat source 7, and then test the moisture content of coal samples a1, a2, a3, and a4 in turn: 5.32%, 5.67%, 6.67%, and 6.72%, respectively. The maximum difference between the moisture test results is 1.40%.
[0057] 3. Divide the coal into layers and zones, set 4 sampling points at equal distances in the X direction, 6 sampling points at equal distances in the Y direction, and 5 sampling points at equal distances in the Z direction, for a total of 60 sampling zones; select 6 sampling zones in the middle and lower layers of the coal, select b1 sampling point 8, b2 sampling point 9, b3 sampling point 10, b4 sampling point 11, b5 sampling point 12, and b6 sampling point 13, and use a coal sampler to take a sample at each sampling point: b1, b2, b3, b4, b5, b6; when taking samples with the coal sampler, immediately use an infrared temperature gun to detect the sample temperatures T1, T2, T3, T4, T5, and T6: 120.6℃, 117.5℃, 127.4℃, 113.3℃, 126.6℃, and 118.5℃.
[0058] 4. The moisture content of coal samples b1, b2, b3, b4, b5 and b6 were detected as follows: 6.38%, 6.87%, 6.67%, 5.99%, 6.85% and 6.66%, with the maximum moisture difference of 0.88%. The maximum temperature difference between the coal samples was 14.1°C, indicating that the coal was dried relatively evenly.
[0059] By detecting coal drying uniformity, this method can guide the optimization and improvement of coal moisture control, coal drying, or coal preheating process systems, thereby improving the heat consumption of coke ovens. Testing coal drying uniformity achieves process optimization and energy conservation through the following pathways: precise control of moisture and temperature to reduce ineffective heat loss; shortening the coking cycle to improve coke oven operating efficiency; and collaboratively optimizing pretreatment processes to reduce overall system energy consumption. This process not only reduces coking heat consumption but also improves coke quality and extends equipment life, forming a virtuous cycle of "energy conservation, cost reduction, and quality improvement."
[0060] The above description is only a preferred specific embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any technician familiar with the technical field, within the technical scope disclosed by the present invention, who makes equivalent replacements or changes based on the technical solution and inventive concept of the present invention, should be covered by the scope of protection of the present invention.
Claims
1. A method for detecting coal drying uniformity during coal moisture control and coal preheating, characterized in that: The specific steps include: S1: Mix the coal; S2: Select sampling points at equal distances on the upper surface of the coal, and take samples a1, a2, a3, a4...a n ; S3: Detect a1, a2, a3, a4...a n Moisture content of sample coal: if the maximum moisture difference is >1.5%, the coal is not dried evenly; S4: If the maximum moisture difference is ≤1.5%, the coal is divided into layers and zones, with N1 sampling points set at equal distances in the X direction, N2 sampling points set at equal distances in the Y direction, and N3 sampling points set at equal distances in the Z direction, for a total of (N1-1)×(N2-1)×(N3-1) sampling zones; S5: Select sampling areas in the middle and lower layers of coal, take a sample in each sampling area, and take samples b1, b2, b3, b4...b n ; S6: When taking out the sample, measure the sample temperature, which are T1, T2, T3, T4...T n ; S7: Detect b1, b2, b3, b4...b n Moisture content of sample coal: if the maximum moisture difference is >1.5%, the coal is not dried evenly; If the maximum moisture difference is ≤1.5%, and the maximum temperature difference between the coal samples is greater than the set value, the coal drying is relatively uneven; If the maximum moisture difference is ≤1.5% and the maximum temperature difference detected between coal samples is less than the set value, the coal is dried relatively evenly.
2. The method for detecting coal drying uniformity during coal moisture control and coal preheating according to claim 1 is characterized in that: In S2, 1 to 20 cm of the upper epidermis is removed and then a sample is taken.
3. The method for detecting coal drying uniformity during coal moisture control and coal preheating according to claim 1 is characterized in that: In S5, a coal sampler is used to take samples in each sampling area.
4. The method for detecting coal drying uniformity during coal moisture control and coal preheating according to claim 1 is characterized in that: In S6, an infrared temperature gun or a thermal imager is used to detect the sample temperature.
5. The method for detecting coal drying uniformity during coal moisture control and coal preheating according to claim 1 is characterized in that: In S7, if the maximum moisture difference is ≤1.5% and the maximum temperature difference between the coal samples is >20-50°C, the coal drying is relatively uneven.
6. The method for detecting coal drying uniformity during coal moisture control and coal preheating according to claim 1 is characterized in that: In S7, if the maximum moisture difference is ≤1.5% and the maximum temperature difference detected between the coal samples is <20-50°C, the coal material is dried relatively evenly.