Energy-efficient, carbon-enriched cement production system and a method of producing cement clinker

An energy-efficient, carbon-enriched cement production system comprising:

• a raw meal preheating and precalcining system,
• a kiln inlet chamber,
• a rotary kiln comprising a first burner;
• a cooler;
• the kiln inlet chamber, the rotary kiln and the cooler being connected in sequence;
• the raw material preheating and precalcining system including a precalciner and a preheater, wherein the precalciner is equipped with a second burner and a raw material inlet;
• a lowermost air inlet of the preheater being connected to an outlet duct of the precalciner, and an uppermost air outlet of the preheater being configured to emit a low temperature flue gas;
• an uppermost feed port of the preheater being configured for feeding raw materials, and a lowermost discharge port thereof being connected to the kiln inlet chamber;
• the cooler including a first cooling zone and a second cooling zone, wherein the first cooling zone is set with a partition wall in the middle, dividing it into a first cooling partition and a second cooling partition, and the second cooling partition being arranged between the first cooling partition and the second cooling zone, an inlet of the first cooling partition being configured to feed a mixture of pure oxygen and high-concentration CO2 flue gas, an inlet of the second cooling partition being configured to fill high-concentration CO2 flue gas, and an inlet of the second cooling zone being configured to fill air,
• an outlet of the second cooling partition being connected to the lowermost air inlet of the preheater through a first pipe,
• the uppermost air outlet of the preheater being connected via a second pipe to a first fan, from an air outlet of the first fan the low temperature flue gas being split into a first portion and a second portion:
• the first portion entering a carbon capture system through a third pipe, and the second portion entering a fourth pipe where a second fan is set, the low temperature flue gas being divided into a third portion and a fourth portion by an outlet of the fourth pipe:
• the third portion entering a fifth pipe to mix with pure oxygen and get into the first cooling partition via the inlet of the first cooling partition, while the fourth portion entering the inlet of the second cooling partition via a sixth pipe, and
• wherein the circulating flue gas has a CO2 concentration of 70-95%.