Petroleum coke is a black solid or powder produced by a delayed coker. According to the structure and appearance of petroleum coke, it is divided into needle coke, sponge coke, and projectile coke. Needle coke has a distinct needle structure and fiber texture, and has special requirements for the production process and raw materials. It is mainly used for the production of high-power graphite electrodes for electric furnace steelmaking. Sponge coke has high chemical reactivity and low impurity content. It is mainly used in aluminum industry and carbon industry. Projectile coke is generally produced from high-sulfur, high-asphalt residue, and can only be used as fuel for power generation, cement and other industries.
The petroleum coke dryer mainly consists of a heat source device, a material feeding device, a drying machine, a discharging system, a dust removal system, and a control system. What are the characteristics of the petroleum coke dryer? The following is a detailed analysis:
1, efficient combination of lifting plate
According to the change of the physical properties of the material in the drying process in the petroleum coke drying machine, a variety of structural combination of the lifting plate is adopted so that the material forms a uniform material curtain in the cylinder and heat and mass transfer is performed with the hot flue gas. For high-viscosity viscous materials, there will be chain breaking devices that prevent blockages and ball breakage. For materials with particularly good fluidity, spoon-type arc plates are used. So that its unit volume evaporation strength of 40 ~ 80kg/m3.h, evaporation intensity than the traditional coke dryer to increase 50 ~ 100%.
2, aligning roller device
The petroleum coke dryer adopts a bearing type and structure that is different from the traditional coke dryer support roller. The support roller is in contact with the wheel belt's self-contained retaining line. The friction surface contact is more widely balanced, ensuring the service life of the roller and belt. Enhance the stability of the cylinder operation. And appropriately reduce the angle between the rollers, reduce running resistance and reduce power consumption.
3, reasonable adjustment speed
According to the physical and chemical properties of the dry material is different, the drying time is different, the design uses the best speed to run, fully guarantee the quality of drying, generally equipped with electromagnetic speed control or frequency control motor.
4, dust tail cover design
According to the requirements of different dry materials, the petroleum coke drying machine expands the cavity to design the tail cover and change the tail gas flow direction so that the tail cover can take the primary dust collection function, which greatly reduces the dust collection pressure of the subsequent dust collector.
5, new sealing device
The front and rear seal rings of the petroleum coke dryer draw on the sealing device of the rotary kiln, which is composed of a labyrinth device, which is resistant to heat and wear, has good sealing effect, long service life, and is convenient to install and maintain.
Domestically produced petroleum coke is superior to imported petroleum coke in key quality indicators such as sulfur, ash and metal content, and the overall quality is better, but volatiles, moisture and other indicators need to be further improved. The average value of domestic petroleum coke moisture is 8.3%, which is much higher than that of imported petroleum coke. This can completely maintain the moisture content below 8% through the improvement of petroleum coke storage and transportation technology and management, and reduce the user transportation costs and the environmental pollution caused by water seepage during transportation.