JPS571425A - Denitrification of exhaust gas discharged from kiln for cement - Google Patents

Denitrification of exhaust gas discharged from kiln for cement

Info

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
Application number
JP7558680A
Other languages
Japanese (ja)
Inventor
Yoichi Ishikawa
Kozo Sedo
Kazumasa Matsumiya
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
DAIICHI CEMENT CO Ltd
DAIICHI CEMENT KK
Original Assignee
DAIICHI CEMENT CO Ltd
DAIICHI CEMENT KK
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by DAIICHI CEMENT CO Ltd, DAIICHI CEMENT KK filed Critical DAIICHI CEMENT CO Ltd
Priority to JP7558680A priority Critical patent/JPS571425A/en
Publication of JPS571425A publication Critical patent/JPS571425A/en
Pending legal-status Critical Current

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
JP7558680A 1980-06-06 1980-06-06 Denitrification of exhaust gas discharged from kiln for cement Pending JPS571425A (en)

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)

* Cited by examiner, † Cited by third party
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

Cited By (1)

* Cited by examiner, † Cited by third party
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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