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US 2026/0242279 A1Published application
Cement firing facility and firing method
AssigneeSumitomo Osaka Cement Co., Ltd.
InventorsShin NAKAYAMA, Yutaka OKADA
Life of this patent
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Abstract
Provided are a cement firing facility and a firing method in a cement firing facility, in which combustion exhaust gas produced in a cement firing facility is effectively utilized to increase the carbon dioxide concentration exhausted from the cement firing facility and to efficiently recover carbon dioxide, and combustibility of fuel is improved to improve a heat efficiency of the cement firing facility.
Claims13
A cement firing facility comprising:
- a drying and grinding device configured to dry and grind a cement raw material to obtain a powder material;
- a suspension pre-heater configured to pre-heat and calcinate the powder material;
- a rotary kiln configured to fire the pre-heated and calcinated powder material to obtain a cement clinker;
- a clinker cooler configured to cool the cement clinker;
- an exhaust gas cooling device configured to cool exhaust gas exhausted from the suspension pre-heater;
- an exhaust gas circulation path that includes an oxygen adding device configured to add oxygen to the exhaust gas cooled in the exhaust gas cooling device and where the exhaust gas to which oxygen is added in the oxygen adding device is circulated and used as cooling gas of the clinker cooler;
- a carbon dioxide recovery device configured to extract partial exhaust gas A from the exhaust gas that is cooled in the exhaust gas cooling device and to which oxygen is not yet added in the oxygen adding device, and to recover carbon dioxide from the exhaust gas A;
- and
- a fuel supply system including mixed gas preparation means for extracting partial exhaust gas B from the exhaust gas and mixing the exhaust gas B and oxygen to prepare mixed gas, and fuel supply means for inserting fuel into the mixed gas to supply the mixed gas including the fuel.
6 more elements
A firing method in a cement firing facility including
- a drying and grinding device configured to dry and grind a cement raw material to obtain a powder material,
- a suspension pre-heater configured to pre-heat and calcinate the powder material,
- a rotary kiln configured to fire the pre-heated and calcinated powder material to obtain a cement clinker,
- a clinker cooler configured to cool the cement clinker,
- an exhaust gas cooling device configured to cool exhaust gas exhausted from the suspension pre-heater,
- an exhaust gas circulation path that includes an oxygen adding device configured to add oxygen to the exhaust gas cooled in the exhaust gas cooling device and where the exhaust gas to which oxygen is added in the oxygen adding device is circulated and used as cooling gas of the clinker cooler,
- a carbon dioxide recovery device configured to extract partial exhaust gas A from the exhaust gas that is cooled in the exhaust gas cooling device and to which oxygen is not yet added in the oxygen adding device, and to recover carbon dioxide from the exhaust gas A, and
- a fuel supply system including mixed gas preparation means for extracting partial exhaust gas B from the exhaust gas and mixing the exhaust gas B and oxygen to prepare mixed gas, and fuel supply means for inserting fuel into the mixed gas to supply the mixed gas including the fuel,
- the firing method comprising performing the pre-heating and calcination of the powder material and the firing of the pre-heated and calcinated powder material using the fuel supply system.
6 more elements
Dependencies are inferred from the claim text.