Who has written a special report on coking coal blending?

Refer to this post: http://bbs.hcbbs.com/thread-413399-1-1.html

Investigation Report on the Coal Quality in Jincheng, Yangcheng and Other Areas: From May 5th to 8th, we conducted an investigation into the coal quality in Jincheng, Yangcheng and other areas, with the aim of determining a suitable coal blending ratio for the proper operation of the No. 2 coke oven as well as for future production. Brewery No. 2’s coke ovens No. 1 and No. 2 use the ramming coking process, which is primarily employed for processing coal with high volatility and low caking properties. Practices by various domestic and international manufacturers have shown that for coals with a preference for adhesiveness, the use of the ramming coking process does not result in any significant improvement or enhancement in coke quality. The characteristics of this process are as follows: 1. When the amount of coke is the same, the maximum amounts of high-volatility coal and weakly caking coal can be used. 2. Under the same coal blending ratio, the quality of coke is better. The southeastern Jin region of our province is a major production area for high-quality anthracite in China. This time, we conducted inspections on the tail coal from Jingxin Coal and Coking Co., Ltd. in Jincheng area, as well as that from Jushan Coal Mine. The results are as follows: 1. Quality analysis of Jingxin coal: moisture (Mad) 1.86%, ash content (Ad) 14.68%, volatile matter (Vdaf) 6.95%, sulfur content (St,d) 0.34%. The results of the flotation test showed a value of ≤1.4; 15% of the coal is high-quality coal, while 70% falls within the range of 1.4–1.8. For coal with a value of ≥1.8, 15% is waste coal with an ash content of 70.74%. This coal is considered easy to process, as it has low ash and sulfur content, with an ash content of 10.5%. Regarding prices, the cost of the ore is 150 yuan per unit (including taxes); additional taxes amount to around 50 yuan. The cost of transportation by truck is 100 yuan per ton, so the price at the factory is 300 yuan per ton. The recovery rate of refined coal is 80%, and the cost of coal washing is 5 yuan per ton; thus, the price of refined coal is around 380 yuan per ton. This coal can be transported to Hejin by rail; the total cost for short-distance transportation on both sides is 25 yuan per ton. The cost of rail transportation and delivery is ＿＿, with the price of raw coal at the factory being 390 yuan, and that of refined coal at ＿＿. As for the coal from Jiu Shan, its particle size after washing is less than 13 mm, the ash content is ≤12.5%, the total moisture content is ≤8%, and the total sulfur content is ≤0.75%. The price of this coal is 198 yuan. This coal source is located further away compared to Jingxin’s, and it cannot be transported to Hejin by rail; instead, it is mainly sold in Henan Province. The freight cost for road transport is higher than that of Jingxin, plus the export fees; it’s around 45 yuan per ton. The price at the factory is over 343 yuan per ton, and the ash content is relatively high. III. Regarding the lean coking coal from the Changzhi Shigejie Coal Mine, its ash content is around 9.5%, volatile matter content is 17%, sulfur content is about 0.3%, and the bonding index is around 50. The price at the mine is approximately 435 yuan per ton (including taxes); the export fee is around 40 yuan per ton. The cost of transportation by truck is higher than that for transportation to Jushan, resulting in a final price at the destination of over 535 yuan per ton. IV. The coking coal used at Changgang Ruida Coking Plant consists mainly of Linfen fertilizer coal and 1/3 coking coal (at around 660 yuan per ton), Anze and Guxian high-quality coking coal (700 yuan per ton for refined coal), as well as local lean coal (430 yuan per ton). Linfen Tongshida uses local fatty coal, coking coal, Taiyuan lean coal (around 350 yuan per ton), and Changzhi thin coal as the main raw materials, along with supplementary coal. V. The price of coal from Mine 1 is 415 yuan per ton, with shipping costs of 40 yuan per ton; thus, the cost of raw coal upon arrival at the plant is 455 yuan per ton. The price of refined coal from Plant 2 is 460 yuan per ton, while the price of lean coal processed into refined coal is also 460 yuan per ton, with shipping costs of 100 yuan per ton, resulting in a total cost of 560 yuan per ton. The price of local lean coal (coal with low binding properties) is around 150 yuan per ton, with shipping costs of 50 yuan. Assuming a recovery rate of 70%, the price of refined coal is approximately 300 yuan per ton. Based on the results of the above analysis, bituminous coal used as a thinning agent has a higher price upon arrival at the plant compared to the local thin coal; similarly, the thin coal from Changzhi also has a higher price than the local variety. It is recommended that the coaling used in our plant should be primarily refined coal that is rich in carbon (with low ash and sulfur content and high volatile matter), raw coal from Mine 1 (refined coal from Mine 2), as well as local thin coal with low ash and sulfur content and a low caking index of 20–30%. If a thinning agent is needed, a small amount of coke powder can be added. Coal blending test plan: This plan is formulated to ensure an optimal coal blending ratio once the second coking plant starts operating, so as to enable Coking Oven No. 2 to achieve successful commissioning on the first attempt and transition to normal production ahead of schedule. 1. Conduct coal quality surveys locally and in other areas from the end of March. 1. Start with Hejin, then Changzhi, Jincheng, Yan’an, and Shenmu. 2. Coal with good adhesiveness to be used by our factory in the future. 3. Focus on investigating coal with good industrial analysis but poor cohesion. 4. Prices of refined coal and raw coal, as well as the availability of raw coal. 5. 200 kg of samples per coal type are taken for testing. 6. For indicators that cannot be measured in our factory’s laboratory, go to the Hejin Quality Inspection Institute or the aluminum plant’s laboratory. II. Conducting small-scale industrial tests using a small coke oven in Plant 1: 1. Use steel plates with a thickness of δ3 mm to create an iron box with dimensions of 600×280×500; holes (Φ5-10 mm) are made in the steel plates every 40 mm using an oxygen cutting gun. 2. Make one square frame with dimensions δ5㎜, 570×470×260. 3. Medium-sized square yew handle, hammer handle. 4. 1 kg of iron No. 8; 5. One pair of large wire cutters. 6. Other equipment is available in the laboratory; please seek the laboratory’s support and cooperation. 7. The proportionally prepared refined coal is pressed into coal cakes with a specific gravity of 0.95–1.0, placed in iron boxes, and then secured with wire. 8. Select a carbonization chamber that is in normal operation (not a side furnace); after pushing out the coke, load it into an iron box and proceed with normal production until coke pushing is completed. 9. Perform the following measurements for refined coal and coke: (1) Moisture; (1) Industrial analysis; (2) Fineness; (2) Volatiles; (3) Density based on industrial analysis; (3) Coking capacity; (4) Volatiles; (4) Coking capacity of large lumps; (5) Viscosity index (Rogers index); (5) Porosity; (6) Gel layer (expansion order in a crucible test); (6) Strength

The proportionally prepared refined coal is pressed into coal cakes with a specific gravity of 0.95–1.0, placed in iron boxes, and then secured with wire.

I have a gentle question: what is the purpose of that box you mentioned? Is it used to press the coal cakes inside it, and then place that box inside an iron container??