Coke Breeze

Coke Breeze

Auxiliary equipment of cathodic protection systems / petroleum coking coal and metallurgy:

Flow injection anodes are usually installed in horizontal anode beds (when there are no environmental constraints) or well anode beds (when subjected to dry desert environmental conditions). In both of the above situations, the anodes are surrounded by a low-resistance carbon backing, which increases the life and performance of the anodes by reducing the resistance between the anode and the ground. Therefore, coking coal is used to lower the resistance of the anode bed (or earthing system). Coking coal composed of carbon particles in different granularities, coking coal is available in bulk or in packages with different weights. In the implementation of coking coal in anodic beds, it is better to use water to compress and thus lower the equivalent resistance of the bed. In the formulas for calculating the resistance of the anode bed, the effective surface of the anode is considered to be the surface of the coking coal.

There are three different types of coking coal:

Type 1: Coal coke breeze Type 2: Calcined petroleum coke breeze Type 3: Special calcined petroleum coke breeze

Type 1 and 2 are usually used in superficial anode beds and type 3 in deep anode beds. In accordance with IPS-M-TP-750/2 standard, three types of carbon backing materials with high amounts of carbon (metallurgical coke 80%, petroleum coke 90% and special petroleum coke 95%) are provided. The difference in chemical properties and density of these three types of coke is shown in the following table:

According to IPS-M-TP-750/2 standard, the specific resistance of coke type 1 and 2 should be less than 100 ohm.cm and the specific resistance of coke type 3 should not exceed 0.1 ohm.cm. The difference in the grading of these three types of coke is according to the following table: