System and method for producing cement clinker through oxygen-fuel combustion: Fid-Bau Portal

System and method for producing cement clinker through oxygen-fuel combustion

HE XIAOLONG / PENG XUEPING / CHEN CHANGHUA / DAI ZHONGYUAN

The invention discloses a system and method for producing cement clinker through total oxygen combustion circulation preheating, the system comprises a preheater, a decomposing furnace, a smoke chamber, a rotary kiln and a cooling machine, the cooling machine comprises a first cooling area and a second cooling area, and the first cooling area comprises a first cooling subarea and a second cooling subarea; mixed gas of high-concentration pure oxygen and carbon dioxide flue gas is introduced into an inlet of the first cooling zone, an outlet of the first cooling zone is communicated with an air inlet of the rotary kiln, first cooling gas discharged from the outlet of the first cooling zone serves as secondary air to enter the air inlet of the rotary kiln, and carbon dioxide flue gas is introduced into an inlet of the second cooling zone; an outlet of the second cooling subarea is communicated with an air inlet of the rotary kiln through a first pipeline, and second cooling gas discharged from the outlet of the second cooling subarea is controlled to serve as quartic air to enter the air inlet of the rotary kiln, so that the concentration of O2 in mixed gas in the rotary kiln is adjusted, and then the flame temperature of oxygen-fuel combustion of the rotary kiln is controlled.

一种全氧燃烧循环预热生产水泥熟料的系统及方法，系统包括预热器、分解炉、烟室、回转窑以及冷却机，冷却机包括第一冷却区和第二冷却区，第一冷却区包括第一冷却分区和第二冷却分区，第一冷却分区的进口通入高浓度纯氧和二氧化碳烟气的混合气，第一冷却分区出口与回转窑进风口连通，第一冷却分区出口排出第一冷却气体作为二次风进入回转窑的进风口，第二冷却分区进口通入二氧化碳烟气，第二冷却分区出口通过第一管道与回转窑进风口连通，控制第二冷却分区出口排出的第二冷却气体作为四次风进入回转窑的进风口，从而调整回转窑内混合气体中O2浓度，进而控制回转窑全氧燃烧的火焰温度。

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