Petroleum Coke is a dark gray, carbon material that is produced as a byproduct of petroleum refining. It is made by thermally cracking heavy crude oil and has unique physical and chemical properties that make it useful in a number of different industries.
It is important to test Petroleum Coke before importing, selling or using it. Testing ensures that the metal, sulfur and carbon content is at a safe level for industrial equipment and the environment. It also helps ensure that the Petroleum Coke has the right porosity for its specific use.
Testing also allows refineries to ensure that they are getting the most out of their product. The physical parameters that are measured include density, porosity, resistivity and more. The results from these tests provide critical information for commercial transactions, controlling plant operations and allocating production costs.
The steelmaking industry uses a variety of methods to convert iron ore and coke into steel. The most common method is the blast furnace process, which heats the raw materials to a high temperature until they are molten. This is followed by the basic oxygen furnace, which removes carbon dioxide and transforms the molten steel into finished products. The blast furnace and basic oxygen furnace processes consume huge amounts of energy, resulting in significant emissions of greenhouse gases and particulates.
Cofiring petroleum coke in these plants can reduce emissions by up to 30%. However, the low volatility of cyclone boilers limits the percentage of cofiring that can be achieved. The pulverized coal (PC) boilers are more conducive to cofiring, but the Hardgrove grindability index of the coke must be high enough to achieve stable combustion and flame stability. This can be difficult for some types of pet coke, especially those with a low HGI value.
One of the most significant uses of petroleum coke is as a blending fuel in electric power generation plants. It can be used in both conventional cyclone and PC boilers, as well as fluidized bed gasification systems. It can also be used to produce metallurgical coke for the steel industry and in coke-water or coke-oil slurries.
Metallurgical coke is made by mixing 5% to 40% of petroleum coke with coal in the coking ovens. This lowers the reactivity of the coal and improves the mechanical strength of the resulting metallurgical coke. It can also be mixed with iron ore in the blast furnace to reduce the amount of raw materials required.
In addition, calcined petroleum coke can be used in a variety of applications for the iron and steel industry. It can be reground in the blast furnace to replace up to 20% of the coke normally used, and it can be added to the raw material for the blast furnace or in the basic oxygen furnace to reduce reactivity and increase mechanical strength.
The other major use of petroleum coke is in the production of steel. It is used to provide the carbon component in the iron blast furnace and as a substitute for coal in the Bessemer, Siemens-Schuckert and finery processes. It can also be pulverized and used as a replacement for natural gas in the hot rolling mill.
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