Calcined Petroleum Coke (petcoke), is a black solid that is produced during the distillation process. It is a very important fossil fuel, used mostly in the production of electric power and as a raw material for petrochemicals. Due to its high thermal conductivity, calcined petroleum coke can be used as an excellent thermal insulation material in the building industry. It can be used as a substitute for mineral wool and other traditional insulation materials. It can also help to reduce energy costs. The platelet-shaped and randomly arranged petcoke particles are responsible for its insulating property. These particles act on the matrix of the building material as a multitude of small, disorderly reflective mirrors that reflect infrared energy (heat and cold radiation) optimally. Calcined petrol is characterized not only by its good thermal conduction but also by its high resistance to the loss of heat.
The insulating characteristics of calcined petroleum coke can be improved by means of special processing techniques. The petroleum coke can be devoid of volatile constituents through heat treatment in rotary furnaces, and then ground into a powder. The granular material is reduced to a particle size of approximately 50 micrometers. The remaining portion is used by the steel industry to carburize steel.
In the waste-heat recovery process, calcined oil coke is heated with water in a heating exchanger. The heat transfer coefficient is affected by the porosity and average temperature distribution of the calcined petrol coke. This article examines the effects of these variables on the heat transfer and the heat recovery efficiency for calcined oil coke.
The experiment was carried out in a waste-heat recovery system that consisted of a heat exchanger (internal and external), a system for supplying calcined petroleum, a system for water circulation, a temperature probe, and an instrument to collect data. The results of these experiments show that with increasing porosity, the calcined Petroleum Coke temperature distribution increases. The temperature of the heat exchanger's outlet decreases while the average coefficient of heat transfer and the waste energy recovery efficiency increase.
The resulting graph provides a fast and easy way to calculate the thermal conductivity. It can be shown for small temperature gradients at low sample temperatures that the k value of calcined oil coke is higher than other insulation materials. The kvalue is a useful tool to compare the thermal insulating qualities of different types of calcined coke, and other refractory products. It can be used to determine the best refractory product for a particular application. The authors declare that they have no conflicts of interests. The research was supported in part by Shandong Provincial Natural Science Foundation (China) (ZR2013EEQ005).
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