What does the coking company use to determine the target production volume for coal tar?
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Due to production restrictions, our coking workshop only managed to complete 70% of its target, while the chemical processing workshop achieved 101%. May I ask experts how the tar production volume for the chemical processing workshop should be determined? In 2008, the targets were exceeded almost every month. We fail to complete it and get punished.
The tar recovery rate can be used as a metric for evaluation!
The tar recovery rate is around 3%, and it varies among different manufacturers; a comprehensive consideration based on the volatile content is necessary.
The coal tar yield depends on the volatiles content of the coal blend, the degree of coal metamorphism, the furnace wall temperature, and the temperature in the furnace roof space; the yield decreases above 800 degrees. And the condensation process operations. Under normal circumstances, the yield is 3–4.5 times that of dry coal; in my workshop, it was 3.98 in February
The volatile matter content of the coal blend is 28–30, and the tar recovery rate is generally around 3.5.
What exactly is the so-called recovery rate referring to? Is it the amount of gas?
The tar production can be calculated as 3.5% of the dry coal consumed, or approximately 0.046 tons of tar is produced per ton of dry coke generated.
It’s about converting your coke production amount into the amount of dry coal required... and then multiplying that by around 3.4%. For example, if your monthly coke production is 100,000 tons and the coking efficiency is 75%, then the amount of dry coal needed is 100,000/0.75... and multiplying that by 3.4% gives the amount of tar produced. Of course, the coking efficiency and tar yield vary from one factory to another; my factory’s tar yield is 3.4%, but we’re not able to reach that level.:(
The tar production is obtained by multiplying the coal loading amount by the yield. For example, if the coal loading is 100 tons and the yield is 3%, then the tar production will be 3 tons. What you have completed is 70% of the planned coal loading amount, while it represents the yield of the actual coal loaded. If the coal blend has a higher volatility content, wouldn’t it achieve just over 100%?
The performance target set by our company is 3.75, and we are able to exceed this target almost every month
For coal tar, Kd·g = [–18.35 + 1.53Vdaf·m – 0.026(Vdaf·m)²] × (100 – Ad/100); for crude benzene, Kd·b = [–1.61 + 0.144Vdaf·m – 0.0016(Vdaf·m)²] × (100 – Ad/100). Here, Kd·g and Kd·b represent the recovery rates of coal tar and crude benzene respectively based on the dry basis of the coal used as feedstock, while Vdaf·m denotes the volatile matter on a combustible basis of the coal fed into the furnace.
It usually refers to the yield of tar; our plant’s tar yield is around 4.0%, with a higher proportion of bituminous coal in the coal blend
This issue is easy to understand: if the volatility content of coal is higher than before, the yield of chemical products will certainly increase, while the yield of coke will decrease. This is why you fail to complete the task with coke, while coal tar succeeds in completing it. As for by how much it rises or falls, it needs to be compared using the value corresponding to the coal volatiles.
Are the assessment criteria coking rate and recovery rate? We generally calculate it based on 27.5 tons of coking per hole, with the tar yield taken as 4% of the coke produced. For example, to produce 10,000 tons of coke (with 8% moisture content), 400 tons of tar must be generated. During the production process, the tar yield is closely related to the operation of the coke oven and coal blending. The temperature in the space above the furnace should generally not exceed 800 degrees; if the suction pressure in the gas collection ducts remains normal, the quality of the tar will be good. The more bituminous coal, the higher the tar yield. As long as the electric capture operation in the chemical production recovery workshop is functioning properly, that’s sufficient.
Under the financial cost allocation method, the assessment of tar should be calculated on a basis of **kg/t per ton of tar recovered; our factory uses 39 kg/t per ton of tar recovered as the standard for evaluation.
It should be based on the average of your factory’s historical data, with a certain improvement target added as the basis for evaluation
I’m not sure how it was decided; our company uses 3.75
Under normal circumstances, the volatiles content of the coal blend is the main factor affecting tar yield； The tar production can be calculated based on the tar yield and the coke output.