CRI+CSR=？
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What should the range be for the reactivity of coke and its strength after reaction? It is said to be between 92 and 94, but the value for our company’s rammed coke ovens is always above 96. Dear sea friends, be sure to include the coking process when specifying the scope! Thank you all!
I work in testing; the process is ramming. Generally it’s 90-94, and there are times it’s over 80 as well. But none above 96 have been found.
90-92, what is the value of CRI+CSR for top-mounted installation, and what does it indicate? Please give me some advice!
Our factory uses a ramming process, and the CRI+CSR value of the coke is 96.
Our coke has a CRI+CSR value of 92, but this doesn’t tell us much. The key lies in the respective values of CRI and CSR.
Our company uses a ramming process; the CRI+CSR value for coke is 92–94, and it drops to 89 in some cases.
I recently worked on a plant where they used a ramming process; the CRI+CSR value for the coke was 94, so it’s probably in that range. It should be feasible to use this method as suggested by the people above
CRI and CSR, just like M10 and M40, are used to characterize the quality of coke. The difference is that the latter two both simulate the impact resistance of coke during its descent in the blast furnace; in particular, M10 simulates the wear resistance during the lumpy zone phase. The simulation environments for CRI and CSR are even more stringent; they are designed to predict the strength and particle size of coke in blast furnaces. However, these simulations are carried out in an environment with an abundance of CO2 (100%) and without alkalis, and the experimental temperatures are also relatively low. Therefore, the industry has now conducted research on its accuracy and other aspects, pointing out many of its shortcomings! Hehe, I’m not sure if that’s correct This post was last edited by ryn on 2009-3-20 10:43]
Our factory uses separate criteria: the reactivity level should be less than 28, and the strength after reaction should be greater than 62; the actual values need to be slightly better. When the strength after reaction is high, it can reach 64.5
Using CRI and CSR to plot a graph, CRI + CSR = 90 represents a line with a slope of -1 and an intercept of 90; the formula indicates that CRI and CSR are not only linearly correlated but also have a correlation coefficient of 1. In fact, the correlation between these two parameters is not that strong, so it would be sufficient to use just one parameter； Moreover, the coefficient of this straight line is not 1; for a top-mounted 6m coke oven, it might be CRI+0.88CSR=87. The sum of these two parameters is merely used to estimate the experimental deviation, which is not very significant and has no physical meaning.
What can be reflected by adding these two indicators together? I guess I’ll have to check them one by one! CRI60 should meet the requirements for export metallurgical coke!
CSR is generally referred to as heat intensity, while CRI is known as heat reactivity. These are key indicators of the quality requirements for coke in steel mills’ blast furnaces; they directly affect the structure of the coke layer inside the furnace, and have a significant impact on factors such as the amount of coal injected and the coke-to-iron ratio. Generally, the former is greater than 60 and the latter is less than 30, which can meet the needs of blast furnaces.
Neither of them makes much sense; they should be expressed separately.
Moving on~ The new national standards are about to be officially implemented... What do you all think??
I think since the two of them represent two different meanings respectively, there is no need to add them together, and they also don’t convey anything meaningful.
After reading this post, I went back and retrieved the data from my previous experiments. There were 10 sets of data: one set had a value of 84, another had 85, while the rest ranged from 90 to 94. The focal lengths for these ten sets were different. We hadn’t analyzed them together before; we analyzed each set separately.