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LIME CAKE (HIGH-WATER-CONTENT CALCIUM CARBONATE) BAKING SYSTEM
To provide a lime cake baking system that reliably prevents re-carbonation of calcium oxide and improves the thermal efficiency by circumventing the re-carbonates from being stuck in a baking exhaust gas flow path to stop the operation as the lime cake (high-water-content calcium carbonate CaCO) is dried and baked to produce calcium oxide (CaO) and the calcium oxide in baked exhaust gas in the baking furnace is re-carbonated by carbon dioxide (CO) in the baked exhaust gas.SOLUTION: In order to prevent the re-carbonation of powdered calcium oxide contained in the baked exhaust gas which is discharged from lime cake baking, the baked exhaust gas discharged from the baking furnace is mixed with air, and the baking gas is rapidly cooled to a temperature of 550°C or lower. The partial pressure of carbon dioxide in the baking gas is reduced to 0.012 MPa or less to prevent re-carbonation. By bringing the mixed gas obtained by separating and collecting calcium oxide from the baked exhaust gas into direct contact with the lime cake, the efficiency of the dry heat transfer of the lime cake is improved.SELECTED DRAWING: Figure 2
【課題】ライムケーキ（高含水炭酸カルシウム〜CaCO3）を乾燥・焼成して酸化カルシウム（CaO）を製造する際、焼成炉の焼成排ガス中の酸化カルシウムは、焼成排ガス中の二酸化炭素（CO２）により再炭酸化し、焼成排ガス流路に再炭酸化物が固着現象を生じて操業停止に至る可能性があることから、酸化カルシウムの再炭酸化を確実に防止するとともに、熱効率を向上させるライムケーキ焼成システムの提供。【解決手段】ライムケーキ焼成後の焼成排ガス中に含有されている粉状の酸化カルシウムの再炭酸化防止のため、焼成炉より排出した焼成排ガスに空気を混合して焼成ガス温度を５５０°Ｃ以下に急速冷却し、また焼成ガス中の二酸化炭素の分圧を0.012ＭPa以下に低下させて再炭酸化を防止し、焼成排ガスより粉状の酸化カルシウムを分離捕集した後の混合ガスをライムケーキに直接接触させることで、ライムケーキの乾燥熱伝達効率の向上を図る。【選択図】図２
LIME CAKE (HIGH-WATER-CONTENT CALCIUM CARBONATE) BAKING SYSTEM
To provide a lime cake baking system that reliably prevents re-carbonation of calcium oxide and improves the thermal efficiency by circumventing the re-carbonates from being stuck in a baking exhaust gas flow path to stop the operation as the lime cake (high-water-content calcium carbonate CaCO) is dried and baked to produce calcium oxide (CaO) and the calcium oxide in baked exhaust gas in the baking furnace is re-carbonated by carbon dioxide (CO) in the baked exhaust gas.SOLUTION: In order to prevent the re-carbonation of powdered calcium oxide contained in the baked exhaust gas which is discharged from lime cake baking, the baked exhaust gas discharged from the baking furnace is mixed with air, and the baking gas is rapidly cooled to a temperature of 550°C or lower. The partial pressure of carbon dioxide in the baking gas is reduced to 0.012 MPa or less to prevent re-carbonation. By bringing the mixed gas obtained by separating and collecting calcium oxide from the baked exhaust gas into direct contact with the lime cake, the efficiency of the dry heat transfer of the lime cake is improved.SELECTED DRAWING: Figure 2
【課題】ライムケーキ（高含水炭酸カルシウム〜CaCO3）を乾燥・焼成して酸化カルシウム（CaO）を製造する際、焼成炉の焼成排ガス中の酸化カルシウムは、焼成排ガス中の二酸化炭素（CO２）により再炭酸化し、焼成排ガス流路に再炭酸化物が固着現象を生じて操業停止に至る可能性があることから、酸化カルシウムの再炭酸化を確実に防止するとともに、熱効率を向上させるライムケーキ焼成システムの提供。【解決手段】ライムケーキ焼成後の焼成排ガス中に含有されている粉状の酸化カルシウムの再炭酸化防止のため、焼成炉より排出した焼成排ガスに空気を混合して焼成ガス温度を５５０°Ｃ以下に急速冷却し、また焼成ガス中の二酸化炭素の分圧を0.012ＭPa以下に低下させて再炭酸化を防止し、焼成排ガスより粉状の酸化カルシウムを分離捕集した後の混合ガスをライムケーキに直接接触させることで、ライムケーキの乾燥熱伝達効率の向上を図る。【選択図】図２
LIME CAKE (HIGH-WATER-CONTENT CALCIUM CARBONATE) BAKING SYSTEM
ライムケーキ（高含水炭酸カルシウム）の焼成システム
SETO HIROSHI (author)
2020-05-07
Patent
Electronic Resource
Japanese
IPC:
C04B
Kalk
,
LIME
/
C01B
NON-METALLIC ELEMENTS
,
Nichtmetallische Elemente
/
C01F
COMPOUNDS OF THE METALS BERYLLIUM, MAGNESIUM, ALUMINIUM, CALCIUM, STRONTIUM, BARIUM, RADIUM, THORIUM, OR OF THE RARE-EARTH METALS
,
Verbindungen der Metalle Beryllium, Magnesium, Aluminium, Calcium, Strontium, Barium, Radium, Thorium oder der Seltenen Erden
/
F27D
Einzelheiten oder Zubehör für Industrieöfen, Schachtöfen, Brennöfen oder Retorten, soweit sie nicht auf eine Ofenart eingeschränkt sind
,
DETAILS OR ACCESSORIES OF FURNACES, KILNS, OVENS, OR RETORTS, IN SO FAR AS THEY ARE OF KINDS OCCURRING IN MORE THAN ONE KIND OF FURNACE
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