The sulfur content in coke is 1.3 times that of the sulfur in the coal fed into the furnace. What factors, do you all think, contribute to this situation?

It is caused by improper coal blending, as the high-sulfur coals in the blended coal have a high sulfur content and account for a large proportion.

The sulfur content in coke is determined by three factors: 1) the sulfur content in the coal fed into the furnace, 2) the form in which sulfur exists in the coal fed into the furnace, and 3) the volatiles in the coal fed into the furnace. For example: if the coal fed into the furnace contains 0.8% sulfur, 20% of this sulfur is in the form of organic sulfur and can volatilize as a result of high temperatures, while the remaining 80% is in the form of inorganic sulfur such as sulfates; this portion of sulfur cannot volatilize along with the raw gas and remains in the coke. If the dry basis volatile matter content of the coal is 26%, and assuming that 1% of the carbon undergoes pyrolysis and remains in the coke, then the overall coking efficiency of this coal is 75%. The sulfur content in the coke is therefore 0.8×80%÷(100-25) = 0.85%, which is 1.1 times the sulfur content of the coal fed into the furnace

It is possible that the sulfur in your sulfur-containing coal is mainly inorganic sulfur, which tends to be present in the coke as well.

I don’t think it’s very likely that the above situation will occur; one should doubt whether the test results are accurate, and whether there is a corresponding relationship between the coke sampled and the blended coal sampled. But if your factory has always used coal with a sulfur content that is 1.3 times higher, you can study the composition of sulfur in different types of coal.

The most likely explanation is the unevenness in the composition of the coal I use. At our company, the ash content of the coal used can sometimes be 11.3, while that of the coke is 13.5; at other times, however, the ash content of the coal is 10.3, with the ash content of the coke being 13.7

I think there’s a high possibility that your sampling was biased. The author didn’t describe the specific sampling process, so it’s difficult to analyze.

There are several reasons for this: 1. Sampling bias – sulfur particles were included in the sample, haha; 2. Inaccurate testing; 3. The water used for quenching coke is desulfurization waste liquid, or it may simply contain sulfur foam! ! ! ! 4. Wrong type of coal was used; almost all coal types were replaced by a single high-sulfur variety. 5. There were issues with the quality of the coal, as it contained extremely high levels of inorganic sulfur. It’s impossible for the proportions to be slightly inaccurate – the sulfur content in coke is 1.3 times that of the coal used in the furnace. The coal used in the furnace always contains some organic sulfur, so it’s impossible for no sulfur to be produced during the coking process

It hasn’t happened before; you can take samples again to check, but the view from the 3rd floor is more scientific, haha

The bituminous coal content is too low, and the temperature is not appropriate either

A high sulfate content in the coal fed into the furnace does not cause sulfur accumulation, although situations like the one you mentioned are rare.