Research On Radiative Transfer And Flow Characteristics Of High Temperature Fuel Gas In Furnace

Because of high energy consumption and operation cost, some industrial furnaces which use high temperature flue gas for radiation heat transfer needs to be reformed, the requirements should be considered, the boiler after the transformation can produce clean high temperature flue gas, heat of high temperature flue gas is released mainly through radiation heat, flue gas should not directly scour the heat exchange tube during heat transfer. This paper introduces a kind of experimental slag tapping cyclone furnace with burning coal-water slurry, it is divided into three parts: combustor which produce high temperature flue gas, horizontal flue, radiant chamber used to simulate production process. This paper discussed technical characteristics and utilization situation of coal-water slurry and cyclone furnace, because PIV was used to study the situation of scouring the heat exchange tube in this experiment, technical advantage and utilization situation of PIV also were introduced.In order to understand heat transfer conditions in radiant chamber of coal water slurry cyclone furnace, and study the effect of heat transfer between fuel gas and simulated working medium. Hot test burning coal-water slurry was performed, it was presented flue gas temperature of radiant combustion chamber, furnace wall and tube wall temperature, result showed that the distribution of furnace temperature was uniformity,and it could achieve transformation requirements. In order to validate the feasibility of the cyclone furnace burning natural gas, burning natural gas hot test was performed, experimental results showed that the coal water slurry (CWS) cyclone furnace could be secure operated. Through comparing heat absorption capacity of different excess air coefficient and different fuel test condition, result found that there was some difference of heat transfer between different fuel, when the heat is satisfied, the radiation chamber flue gas temperature, furnace wall and heat exchange tube temperature can be reduced by improving excess air coefficient, so as to ensure safe operation of cyclone furnace. PIV measurement result is verified through furnace temperature field and soot formation conditions. In order to deeply understand whether flue gas would directly scour the heat exchange tube, and verify whether shunt can meet the design requirement. Research about the high temperature flue gas flow characteristics around shunt was performed through PIV, high-temperature particles(about5um diameter) were used as tracer particles in this experiment, it studied fuel gas flow field characteristics around shunt of different load. Research shown that jet tail would appear the phenomenon of local disturbance when flue gas jet strength was greater, large velocity gradient and vortex structure were appeared while flue gas was nearer to the exit of jet, and small velocity gradient was existed when flue gas was far away from the exit of jet. PIV measurement result shows that when jet velocity was22m/s, the flue gas jet had better rigidity, and flue gas would not directly scour heat exchange tube. PIV could reflect the flue gas velocity field, and it has very good instructive significance in shunt design...