The finite time thermodynamics analysis and the energy-saving optimization of the coil organic heat transfer material heater
Wei Li Gu1, 2, Han Qing Wang3, Guang Xiao Kou3, Qiao Ying Cao2
1School of Energy and Power Engineering, Central South University, Changsha 410000, China
2Department of Urban Construction, University of South China, Hengyang 421001, China
3Hunan University of Technology, Zhuzhou 412000, China
According to the problems as low efficiency, aging of organic heat transfer material and frequent accidents in the operation of the coil organic heat transfer material heater, with the finite time thermodynamics, this paper studies the actual processes including combustion process, flow and heat transfer process, considers the irreversible factors as combustion condition, the fuel characteristics, flow resistance and heat transfer temperature difference, derives the calculation formula of energy loss for three processes and to determine the minimum energy loss. Based on this, this paper proposes energy-saving optimization strategy and gives examples, the results accord with the analysis. In design and operation, the outlet flue gas temperature of furnace, flue gas temperature and flow velocity of hot oil are important.