Rotary Dryer

Petroleum coke is made from heavy oil or other heavy oils after crude oil distillation. It is passed through the furnace tubes of a 500℃±1℃ heating furnace at a high flow rate to cause cracking and condensation reactions in the coke tower. Then, after a certain period of coking, it is cooled and decoked to produce petroleum coke.

It is widely used in metallurgy, chemical industry and other industries as a raw material for electrodes or chemical products. Petroleum coke can be used in graphite production, smelting and chemical industry depending on its quality.

During the use of petroleum coke dryer, energy consumption mainly comes from the supply of heat source, such as electricity, fuel oil, gas or air energy. Petroleum coke dryers with different heat sources have different energy consumption.

For example, the energy efficiency of electric dryer is about 0.95, and the energy output value is 817 kcal/degree;

while the energy efficiency of fuel oil dryer is 0.8, and the energy output value is 8240 kcal/kg.
The energy consumption of petroleum coke dryer is closely related to the type of heat source, equipment efficiency and operation mode. By selecting high-efficiency dryers, optimizing operating parameters, implementing waste heat recovery and regular maintenance, energy consumption can be effectively reduced and energy utilization efficiency can be improved.

The petroleum coke dryer uses the waste gas generated by the hot blast furnace to be sent to the blast furnace coke bin through pipes and high-temperature induced draft fans. It uses high-temperature waste gas (350~400℃) to pre-dry the coke, reducing the average moisture content of the coke entering the furnace from 11% to 6%, so as to reduce the adverse effects of coke powder and coke moisture fluctuations on the furnace condition, thereby increasing the calorific value and temperature of the coal gas, increasing TRT power generation, and reducing the coke ratio entering the furnace.

The Mohs hardness of petroleum coke is affected by many factors, including calcination temperature, calcination time and raw material composition. Studies have shown that when the calcination temperature of petroleum coke increases from 1000℃ to 1400℃, its Mohs hardness increases from 50 to 90.

Calcination time is another factor that affects the Mohs hardness of petroleum coke. The longer the calcination time, the higher the Mohs hardness of petroleum coke. The raw material composition, especially the sulfur and impurity content, also affects the hardness of petroleum coke. The presence of sulfur and impurities may cause instability in the internal structure of petroleum coke, thereby reducing its hardness.

The hardness of petroleum coke has a significant impact on its drying process, including drying time, energy consumption, and equipment wear. Therefore, in the drying process of petroleum coke, it is necessary to adjust the drying process and equipment parameters according to the specific hardness characteristics of petroleum coke to achieve the best drying effect.

Based on the structure and appearance of petroleum coke, petroleum coke products can be divided into four types: needle coke, sponge coke, shot coke and powder coke.

Based on the sulfur content, it can be divided into high-sulfur coke (sulfur content above 3%) and low-sulfur coke (sulfur content below 3%). Low-sulfur coke can be used as anode paste and prebaked anodes for aluminum plants and graphite electrodes for steel plants.

Among them, high-quality low-sulfur coke (sulfur content less than 0.5%) can be used to produce graphite electrodes and carbon enhancers. General-quality low-sulfur coke (sulfur content less than 1.5%) is often used to produce prebaked anodes.

Low-quality petroleum coke is mainly used for smelting industrial silicon and producing anode paste. High-sulfur coke is generally used as fuel for cement plants and power plants.