Problems with coke M25
Thread Content
This post was last edited by Qingxin on 2010-5-8 08:27. I would like to ask fellow sailors: our factory’s internal control indicator M25 is at 89. What factors could influence this value? In terms of furnace temperature, what are the influencing factors? What is the optimal level for controlling volatile matter? Thank you! Here are the indicators for analysis by experts: Coke: M25: 88.7, M10: 7.4; Total moisture: 7.26; Moisture analysis value: 0.32; Ash content: 12.77; Volatiles: 0.93; Fixed carbon: 86.14; Sulfur content: 0.63. Coal to be fed into the furnace: Particle size: 87; Total moisture: 8.46; Analytical moisture: 1.40; Ash content: 9.25; Volatiles: 32.89; Fixed carbon: 60.05; Sulfur content: 0.75; G value: 58
It’s related to the type of coal used in blending – could it be that too much bituminous coal has been used? Appropriate addition of lean coal can improve the size of coke agglomerates
The volatility of the coal fed into the furnace is so high; it must be pre-formed coke. Please explain the coal blending ratio as well as the analysis of the raw coal
1. In the case of top feeding, the volatiles content of the coal fed into the furnace is 32.89%, which is somewhat high; therefore, the volatiles content of the coal fed into the furnace should be controlled appropriately. 2. The G value of the coal fed into the furnace can be increased appropriately; cohesion is a prerequisite for coking property. 3. The volatiles content of coke should be controlled at between 1% and 1.25%; either excessive burning or underburning of the coke can affect its mechanical strength as well as its thermal properties such as CRI and CSR. 4. If the coal fineness is for top-loading, it is generally sufficient; if it is for ramming, the fineness can be increased appropriately. 5. If possible, the rationality of the coal blending formula can be determined by analyzing the vitrinite reflectance using a coal rock analysis microscope.
Our factory uses TIL43-50D type ramming coke ovens
In rammed coke ovens, the volatility is indeed a bit high. Let’s take a look at the density of the coal pellets – we should keep it between 1.1 and 1.15. The G value in the coal mixture is currently 58; it can be increased to around 65. It’s better to maintain the Y value between 12 and 14. It would be ideal to conduct a coal lithology analysis on the coal used in the furnace. I estimate that the CSR of your coke will be around 48–53
This post was last edited by Qingxin on 2010-5-10 08:51. Please help analyze the following indicators; the factory’s internal control value M25 is 90. A detailed analysis would be appreciated. Thank you, Haiyou! Coke specifications: M25, M10; moisture, ash content, volatile matter, sulfur content – 89.00, 7.2, 10.84, 12.33, 0.89, 0.61; 89.40, 7.00, 6.22, 12.34, 0.91, 0.68; 89.10, 7.30, 7.20, 12.64, 1.06, 0.60; 89.00, 6.40, 9.50, 11.71, 0.94, 0.60. Coal specifications for use in furnaces: particle size, total moisture, ash content, sulfur content, G value – 90, 9.24, 8.67, 0.75; 68, 92, 8.12, 8.38, 0.78; 62, 92, 8.72, 8.80, 0.77; 61, 86, 9.70, 8.93, 0.75; 66
The indicators of light columns for coal entering the furnace cannot be analyzed comprehensively. Just list the types of coal, varieties, and proportions, and someone will give you advice. It is estimated that in China, it is not possible to give you a satisfactory answer based solely on the indicators for the coal fed into the furnace.