Abstract
In order to fully understand the energy and exergy transfer processes in sinter vertical coolers, a simulation model of the fluid flow and heat transfer in a vertical cooler was established, and energy and exergy efficiency analyses of the gas–solid heat transfer in a vertical cooler were conducted in detail. Based on the calculation method of the whole working condition, the suitable operational parameters of the vertical cooler were obtained by setting the net exergy efficiency in the vertical cooler as the indicator function. The results show that both the quantity of sinter waste heat recovery (SWHR) and energy efficiency increased as the air flow rate (AFR) increased, and they decreased as the air inlet temperature (AIT) increased. The increase in the sinter inlet temperature (SIT) resulted in an increase in the quantity of SWHR and a decrease in energy efficiency. The air net exergy had the maximum value as the AFR increased, and it only increased monotonically as the SIT and AIT increased. The net exergy efficiency reached the maximum value as the AFR and AIT increased, and the increase in the SIT only resulted in a decrease in the net exergy efficiency. When the sinter annual production of a 360 m2 sintering machine was taken as the processing capacity of the vertical cooler, the suitable operational parameters of the vertical cooler were 190 kg/s for the AFR, and 353 K for the AIT.
Highlights
The simulation model of the flow and heat transfer in the vertical cooler was established by taking the particle movement into account based on the porous medium model and local non-thermodynamic equilibrium double energy equations, and the operational parametric effects, involving the sinter inlet temperature (SIT), air flow rate (AFR) and air inlet temperature (AIT), on the energy and exergy transfer processes in the vertical cooler were investigated in detail
As it is known from Equation (3), because the air pressure drop in the bed layer is larger than zero, the air pressure exergy is greater than zero, which means that the gas flow in the vertical cooler needs to consume the external work
The actual sinter production of a 360 m2 sintering machine was taken as the simulation processing capacity of the vertical cooler, namely, 3.9 million tons per year, which means that the sinter mass flow rate in the vertical cooler is 152 kg/s
Summary
Publisher’s Note: MDPI stays neutral with regard to jurisdictional claims in published maps and institutional affiliations. Tian et al [16,17] established a simulation model of three-dimensional flow and heat transfer in an annular cooler and optimized the operating parameters of a ring annular cooler by taking the sinter outlet temperature and exergy of SWHR as the objective function. The simulation model of the flow and heat transfer in the vertical cooler was established by taking the particle movement into account based on the porous medium model and local non-thermodynamic equilibrium double energy equations, and the operational parametric effects, involving the sinter inlet temperature (SIT), air flow rate (AFR) and air inlet temperature (AIT), on the energy and exergy transfer processes in the vertical cooler were investigated in detail. Energies 2021, 14, 4522 are very important and useful for improving the recovery rate of sinter waste heat and could provide theoretical guidance for the design and operation of sinter vertical coolers
Sign-in/Register to view highlights & summary Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callDisclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
