Numerical Simulation Of Heat Transfer In Regenerator And Operating Regulation Research Of Hot Blast Stove

The regenerative reheating furnace is an important assistant equipment of the blast furnace smelting. Its task is to supply hot air stably for the blast furnace. The checker in regenerator of hot blast stove is the carrier of heat exchange. The heat charge and discharge efficiency of checkers affect the temperature of hot air and the efficiency of hot blast stove. A reasonable operating regulation can make the hot blast stove to maximize its capacity and obtain great economic benefits. Consequently, it is significant to research on heat transfer and operating regulation of hot blast stove.In this dissertation, based on the characteristics of heat transfer of regenerator, the simplified models for heat transfer calculation are established. In order to solve heat transfer of single hole and its checkers, a single-hole model is built. In order to solve heat transfer of the whole regenerator, a porous model is established based on the porous theory. By means of FLUENT software, k-εturbulent equation model, compositional model and discrete ordinate (DO) model are utilized to solve single-hole model. K-εturbulent equation model, compositional model, P-1 model and porous media conditions are combined to solve the porous model. Finally, this paper summarizes calculation method of cycle time, gas flow under different operating regulations, and numerical simulation of them.This research obtains the simulation results of maximum temperature of outlet flue gas in combusting period and average temperature of outlet hot air in blasting period, which are based on single-hole model. The model is verified and results show that errors between each simulation result and corresponding practical value presented in references is 4.0% and 2.5% respectively. The simulation results based on the porous model show that the temperature distribution of regenerator on the same height cross section is uniformity, the heat transfer speed of 7-pole checker is faster then 5-pole checker, and the thermal efficiency of 7-pole checker is higher. The results of different operating regulations show that under"one burning, two blasting"that is one of three operating regulations of three cooperating hot blast stoves, the thermal efficiency of regenerator and its average temperature of outlet hot air are highest.In summary, the simplified model of heat transfer for regenerator based on FLUENT software can simulate the heat transfer of hot blast stove and its working condition under different operating regulations. The model provides a simple and efficient method for hot blast stove optimum design and optimizing its operating regulation.