JPS571425A - Denitrification of exhaust gas discharged from kiln for cement - Google Patents
Denitrification of exhaust gas discharged from kiln for cementInfo
- Publication number
- JPS571425A JPS571425A JP7558680A JP7558680A JPS571425A JP S571425 A JPS571425 A JP S571425A JP 7558680 A JP7558680 A JP 7558680A JP 7558680 A JP7558680 A JP 7558680A JP S571425 A JPS571425 A JP S571425A
- Authority
- JP
- Japan
- Prior art keywords
- kiln
- cement
- exhaust gas
- powder
- urea
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
Abstract
PURPOSE: To reduce NOx contained in the kiln exhaust gas to N by adding a specified amount of urea to a cement material being heated to a high temperature in a suspension preheater of the kiln for cement kiln.
CONSTITUTION: In the cement kiln B comprising the suspension preheater which may be further provided with an auxiliary furnace, a fine powder of blended cement material is preheated in the region from the first-stage cyclone I to the fourth-stage cyclone IV or in the auxiliary furnace V prior to entering the kiln B. In this case, the powder material of cement is introduced via a conduit provided between the first-stage cyclone I and the second-stage cyclone II, then it is heated in the cyclone of each stage by the high-temperature exhaust gas which is discharged from the kiln B and flowing upward, whereby CaCO3 is pyrolyzed into CaO and preheated. In this case, in a preheater in a region where the material powder is heated to 300W 1,200°C, urea is added to the powder, at a molar ratio of urea to NOx in the exhaust gas of 0.1W0.3, thereby reducing the NOx to N which is harmless.
COPYRIGHT: (C)1982,JPO&Japio
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP7558680A JPS571425A (en) | 1980-06-06 | 1980-06-06 | Denitrification of exhaust gas discharged from kiln for cement |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP7558680A JPS571425A (en) | 1980-06-06 | 1980-06-06 | Denitrification of exhaust gas discharged from kiln for cement |
Publications (1)
Publication Number | Publication Date |
---|---|
JPS571425A true JPS571425A (en) | 1982-01-06 |
Family
ID=13580446
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP7558680A Pending JPS571425A (en) | 1980-06-06 | 1980-06-06 | Denitrification of exhaust gas discharged from kiln for cement |
Country Status (1)
Country | Link |
---|---|
JP (1) | JPS571425A (en) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP2009154116A (en) * | 2007-12-27 | 2009-07-16 | Ube Machinery Corporation Ltd | Denitration apparatus and denitration method |
-
1980
- 1980-06-06 JP JP7558680A patent/JPS571425A/en active Pending
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP2009154116A (en) * | 2007-12-27 | 2009-07-16 | Ube Machinery Corporation Ltd | Denitration apparatus and denitration method |
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