Numerical Investigation Of Influence Of Waist Cooler And Exhaust On Key Condition Parameters Of Float Glass Furnace

This thesis reviewed systematically the development of numerical simulation for oxy-fuel combustion technology of float glass furnace. In view of detailed study on theory of oxy-fuel combustion technology of float glass furnace, we built three dimensional combustion space and melting pool mathematical models, and investigated the process of float glass furnace with Fluent software numerically. The effect rules of depth and location of waist cooler on stream and temperature field of liquid glass were researched in 460t/d float glass furnace. Result showed that:(1) energy consumption and back-flow would descend with increased depth of waist cooler. Flow state of liquid glass would change, and the loop flows back and front of furnace neck would increase when waist cooler existed; (2) when waist cooler migrated from entrance to exit of furnace neck, forward-flow and back-flow increased gradually while forward-flow temperature and back-flow temperature decreased at the entrance of furnace neck. Under the same circumstances, forward-flow and forward-flow temperature, back-flow and back-flow temperature decreased in exit, respectively.Meanwhile, taking combustion with one pair exhausts as research object, we investigated the effect of size of exhaust on temperature and pressure in combustion space. Results showed that:(1) exponential plot showed that pressure in combustion space fell with increased size of exhaust. The average pressure in combustion space was about 6 Pa when exhaust area of one side is 0.36m2. Exhaust area didn't strongly influence state of flame. (2) Alternation of location of exhaust made a great impact on pressure and out-flow in combustion space. When the exhaust was placed in the middle of the combustion space, out-flow and average pressure were the highest of the three schemes.Furthermore, the coupled numerical simulation was carried out based on previous study on combustion space and glass pool of float glass furnace. Results showed that not only was heat transfer from combustion space to glass pool related with temperature distribution, but also was connected with heat values of species, emission coefficients and conductive coefficients.