Title:
AMMONIA INJECTION DEVICE
Document Type and Number:
Japanese Patent JP3702094
Kind Code:
B2
Abstract:
PROBLEM TO BE SOLVED: To provide an NH3 injection device capable of keeping the proper excess quantity of an NH3 gas injected into a waste gas to change sulfur dioxide in the waste gas into ammonium sulfate.
SOLUTION: In this feed back system, an ammonia injection quantity is set by a heavy oil flow rate signal 1 based on a fuel flow rate - NH3 injection quantity curve previously set in a function generator 4. The set value of the ammonia injection quantity is corrected by the deviation between the excess NH3 concentration signal 2 installed in an outlet flue of an electric dust collecting device and the previously set excess NH3 concentration. In such a case, the fuel flow rate - NH3 injection quantity curve is constructed so as to automatically correct it with time based on the past record of the NH3 injection quantity in a previously set fixed condition such as the NH3 injection quantity after 1 hr when the heavy oil flow rate reaches 100%. As a result, the control of the stable NH3 injection quantity small in feed back correcting quantity is carried out.
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Inventors:
Masahiro Anza
Masaya Kato
Yata victory
Yasuhiro Ishii
Hiroaki Obata
Masaya Kato
Yata victory
Yasuhiro Ishii
Hiroaki Obata
Application Number:
JP13977098A
Publication Date:
October 05, 2005
Filing Date:
May 21, 1998
Export Citation:
Assignee:
MITSUBISHI HEAVY INDUSTRIES,LTD.
International Classes:
B01D53/34; B01D53/50; (IPC1-7): B01D53/50; B01D53/34
Domestic Patent References:
| JP8257370A | ||||
| JP62171733A |
Attorney, Agent or Firm:
Shin Ishikawa
Akira Ishikawa
Akira Ishikawa
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