Is the assessment of tar yield an assessment of chemical products?
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Could an expert please analyze this? Is the level of tar yield entirely determined by the chemical production department? I have seen a coking plant where the tar yield was less than 3%, and the emissions of tar from chemical processes did not exceed the allowed limits. But can this indicator be used to assess chemical production? Moreover, many factories tie their wages to those of their workers.
The tar yield is not solely the responsibility of the chemical processing unit; it is also greatly related to the coaling used. But *it’s still customary to evaluate the production processes
This indicator should not be determined by chemical conversion capacity; it is highly related to the type of coal and its blending. If the tar yield is low, first check whether there has been a change in the coal type; only if there is no change can the chemical conversion process be evaluated.
Under the condition of a fixed coal blending ratio, the chemical production workshop is evaluated based on the Vdaf value. Tar production is determined by coking time and volatile matter, but it is only logical that the purification of tar from the gas should be the responsibility of the chemical processing department. (This is how things are in our factory; it can serve as a reference.)
With the coal type and blending ratio remaining unchanged, it is appropriate to conduct evaluations based on chemical properties; this is generally how it is done. If there are changes, such evaluations should take those changes into consideration as appropriate.
The key factor affecting the level of tar yield is coal blending, but it is also closely related to the operations involved in tar processing – such as the control of the tar level in mechanical clarifiers, the timing of returning tar, and the rate (quantity) at which tar is returned. These factors are also closely associated with the level of tar yield. In routine assessments of tar yield, the focus is usually on the recovery workshop (also known as the chemical products workshop or gas purification workshop, etc.). If there are significant changes in the coal blending ratio, the impact on tar yield is taken into consideration appropriately in such assessments.
Evaluating the chemical products without changing the coal blend is one-sided; it is also influenced to some extent by the operation of the riser.
The rising pipes are now all automated; it’s also related to the adjustments made in the fan room. It still falls under the chemical production area… Alas! There’s nothing that can be done about it