At present, the heat transfer system in the decomposing furnace of the cement rotary kiln can realize the material distribution on the one hand and the overheating of the air temperature on the other hand.
At present, the heat transfer system in the decomposing furnace of the cement rotary kiln can realize the material distribution on the one hand and the overheating of the air temperature on the other hand. In the calciner of the cement rotary kiln, theburning speed and heat generating capacity are high. The powdered material isdispersed in the air flow, and has a very high heat transfer rate in thesuspended state. The burning heat released by the combustion is absorbed by thematerial in a short time.
The heat transferin the calciner of cement rotary kiln is mainly convective heat transfer, followedby radiative heat transfer. In the furnace, the fuel and materials aresuspended in the air stream. The combustion of the fuel heats the gas, whilethe high-temperature air stream convections the material in a convectionmanner. Due to the full contact of the gas-solid two cabinets, the heattransfer rate is high.
In addition, thetemperature of the combustion gas in the decomposing furnace of the cementrotary kiln determines that the radiant heat release is not high in the hightemperature zone of the cement rotary kiln. This radiative heat transfer has avery important positive significance for promoting the uniform temperature ofthe whole furnace.
The reason why theheat transfer rate in the calciner of the cement rotary kiln is much higherthan the decomposition zone of the rotary kiln is that the heat transfer areais greatly increased. In fact, there is also a small amount of material in therotary kiln suspended in the air flow. The heat transfer area in the kiln islarger than the above calculation results. The material powder in the calcineris easy to agglomerate. When the dispersion is not sufficient, the heattransfer area is higher than the above calculation results.