I would like to ask what might be the reasons for the coal tar density exceeding the standard value of 1.22?
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As the title suggests, I am seeking expert assistance to resolve this issue.
In such cases, problems such as high viscosity, excessive free carbon, and difficulty in removing moisture often occur simultaneously. This is mainly related to the operation of the coke oven: whether the negative pressure used during coal loading is too high, whether the heating regime of the coke oven is properly implemented, and whether the coking time is too long.
First, check the temperature in the space above the furnace. If this temperature is too high, it will accelerate thermal decomposition, leading to an increase in the amount of free carbon, as well as an increase in the viscosity and density of tar, along with an increase in moisture content.
Adjusting the coke oven operation or enhancing tar decanting can both reduce tar density.