Transient natural convection and conduction heat transfers on hot box of a coke drum in Pre-heating stage

International Conference on Computing and Applied Informatics 2016

物理学;计算机科学

Siahaan, A.S.^1 ; Ambarita, H.^2 ; Kawai, H.^1 ; Daimaruya, M.^1

Department of Mechanical Systems of Engineering, Muroran Institute of Technology, 27-1 Mizumoto-cho, Muroran

050-8585, Japan^1

Sustainable Energy Research Centre, Faculty of Engineering, University of Sumatera Utara, Jl. Almamater Kampus USU, Medan

20155, Indonesia^2

关键词: Cyclic heating;    Heating stage;    Mechanical loads;    Oil refineries;    Transient natural convection;    Triangular cavities;    Triangular enclosure;    Useful life;   

Others  :  https://iopscience.iop.org/article/10.1088/1742-6596/801/1/012096/pdf
DOI  :  10.1088/1742-6596/801/1/012096

学科分类：计算机科学（综合）

来源: IOP

【 摘 要 】

In an oil refinery unit, coke drum is subjected cyclic thermal stress and mechanical loads due to cyclic heating and cooling loads. Thus, the useful life of a coke drum is much shorter than other equipment. One of the most severe locations due to thermal stress is shell to skirt junction. Here, a hot box is proposed. In this study effectiveness of a hot box will be analyzed numerically. The addition of hot box (triangular cavity) was expected to generate natural convection, which will enhance heat transfer. As for the result show that heat flux conduction and natural convection have the same trend. The peak of conduction heat flux is 122 W/m2and for natural convection is 12 W/m2. In the heating stage of coke drum cycle it found that the natural convection only provide approximately 10 % of heat transfer compare to conduction heat transfer. In this study it was proved that in the heating stage, the addition of triangular enclosure is less effective to enhance the heat transfer than previously thought.