JPS5489972A - Ammonia flow rate control method in dry exhaust gas denitration process - Google Patents
Ammonia flow rate control method in dry exhaust gas denitration processInfo
- Publication number
- JPS5489972A JPS5489972A JP15723077A JP15723077A JPS5489972A JP S5489972 A JPS5489972 A JP S5489972A JP 15723077 A JP15723077 A JP 15723077A JP 15723077 A JP15723077 A JP 15723077A JP S5489972 A JPS5489972 A JP S5489972A
- Authority
- JP
- Japan
- Prior art keywords
- value
- exhaust gas
- injection
- mean value
- concn
- 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
Landscapes
- Chimneys And Flues (AREA)
- Treating Waste Gases (AREA)
Abstract
PURPOSE: To avoid an oversupply of NH3 by calculating the mean value of the concn. of NOx in exhaust gas; picking out the negative value of the difference between the concn. of NOx at the time of denitration and the mean value; adding the negative value to the mean value; and using the added value as an NH3 injection setting value.
CONSTITUTION: The concn. of NOx in exhaust gas to be denitrated is previously detected for a fixed time, and the mean value is calculated. The concn. of NOx in exhaust gas entering denitrator C from flue A is detected with detector 1, and the negative value of the difference between the value and the mean value is picked out and added to the mean value. This signal is sent to setting value generation circuit 2 to actuate NH3 injection amt. regulation meter 8, NH3 injection amt. regulator 9 and NH3 injection amt. operation valve 10, thus injecting NH3 into flue A from NH3 injector B while controlling the injection amt. By this method a fluctuation in denitration rate is minimized, and discharge of unreacted NH3 is reduced, thereby solving a problem about high cost due to injection of excess NH3.
COPYRIGHT: (C)1979,JPO&Japio
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP15723077A JPS5489972A (en) | 1977-12-28 | 1977-12-28 | Ammonia flow rate control method in dry exhaust gas denitration process |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP15723077A JPS5489972A (en) | 1977-12-28 | 1977-12-28 | Ammonia flow rate control method in dry exhaust gas denitration process |
Publications (1)
Publication Number | Publication Date |
---|---|
JPS5489972A true JPS5489972A (en) | 1979-07-17 |
Family
ID=15645067
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP15723077A Pending JPS5489972A (en) | 1977-12-28 | 1977-12-28 | Ammonia flow rate control method in dry exhaust gas denitration process |
Country Status (1)
Country | Link |
---|---|
JP (1) | JPS5489972A (en) |
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS61257221A (en) * | 1985-05-08 | 1986-11-14 | Nippon Kokan Kk <Nkk> | Controller for amount of ammonia to be blown in catalytic denitration |
EP0866395A1 (en) * | 1997-03-21 | 1998-09-23 | Von Roll Umwelttechnik AG | Method and device for controlling the input quantity of a treating medium for reducing the nitrogen concentration in the exhaust gases of a burning process |
-
1977
- 1977-12-28 JP JP15723077A patent/JPS5489972A/en active Pending
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS61257221A (en) * | 1985-05-08 | 1986-11-14 | Nippon Kokan Kk <Nkk> | Controller for amount of ammonia to be blown in catalytic denitration |
EP0866395A1 (en) * | 1997-03-21 | 1998-09-23 | Von Roll Umwelttechnik AG | Method and device for controlling the input quantity of a treating medium for reducing the nitrogen concentration in the exhaust gases of a burning process |
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