Volatile matter calculation
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The coking coal ratio is 20, and the volatility is 24.5； The bituminous coal ratio is 10, with a volatility content of 35.0 ； The proportion of lean coal is 5, with a volatility content of 20.0; the volatility content of the blended coal is
That still doesn’t add up to 100%, right? What other types of coal are there? Or is the volatility of all other coal types 0? If that is the case, and given that volatiles are additive, the volatiles of the blended coal amount to 9.4.
It should be 9.4/35% = 26.86. But I don’t know why
The moderator is right; the calculations are also correct – the sum of all individual types of coal does not equal 100%. Formula for calculation of the ratio: X = x1×a + x2×b + x3×c + x4×d… / 100. Here, X represents the property indicator to be calculated in the blended coal. Such as: moisture, ash, volatile matter, etc ； In the formula, x1, 2, 3, 4 represent the property indicators of the respective coal types to be calculated. For calculating water, water is taken into account. Like what, everything ； a, b, c, d—the weight percentage of each individual coal type in the blended coal.
Volatile matter is additive, that is, it is calculated as the sum of the products of the proportion of each coal type and its volatile matter content!
If there are no other types of coal, and the percentage is less than 100%, then one simply divides by XX%. In other words, the above three types of coal are considered as 100% in total, while in reality their combined percentage is only 35%; thus, 9.4%/35% represents the volatility content of the blended coal. Why must it be 100%? As long as this ratio is used, it’s sufficient. Last edited by cl4167 on 2009-3-21 at 10:28
The default unit for the ratio is %; it needs to be normalized as part of the mixing process, otherwise it can lead to ambiguity and confusion
Why waste everyone’s time? Simply state that there are only these three types of coal, with coking coal, bituminous coal, and lean coal in a ratio of 4:2:1, and their volatilities being 24.5, 35.0, and 20.0 respectively – wouldn’t that make it easier for everyone to calculate?
Volatile matter is additive, that is, it is calculated as the sum of the products of the proportion of each coal type and its volatile matter content