Title:
METHOD AND APPARATUS FOR RECOVERING AMMONIA DURING SEPARATION OF NITROGEN OXIDES FROM WASTE GAS
Document Type and Number:
Japanese Patent JPS63178829
Kind Code:
A
Abstract:
In a firing installation with a furnace (1) and a boiler (2), ammonia NH3 is admixed to the flue gas stream, whereby the nitrogen oxides are reduced in a reaction chamber (5) with catalysts. In a flue gas wet-scrubbing unit (7) downstream of the reaction chamber (5), the unreacted ammonia is dissolved in the scrubbing water. The latter is passed through a connection line (8) into a stripping column (9), where the ammonia is stripped from the scrubbing water and mixed with introduced air. This air enriched with ammonia NH3 is passed as combustion air into the furnace (1). As a result, the nitrogen oxide reduction can be operated with a large ammonia excess, so that a degree of nitrogen oxide separation of any desired high level can be achieved. In addition, the ammonia stripped out in the stripping column (9) is passed to the combustion, where it reacts with the NOx present, whereby the ammonia consumption is substantially reduced. This can also be achieved in combination with the SNCR process. ……
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Inventors:
RIYUUDEI FURAI
HANSU RIYUEGU
HANSU RIYUEGU
Application Number:
JP25643187A
Publication Date:
July 22, 1988
Filing Date:
October 13, 1987
Export Citation:
Assignee:
VON ROLL AG
International Classes:
B01D53/58; B01D53/94; C01C1/02; C01C1/12; C02F1/20; (IPC1-7): B01D53/34; B01D53/36; C01C1/02; C02F1/20
Domestic Patent References:
| JPS5845721A | 1983-03-17 |
Attorney, Agent or Firm:
Mitsuyoshi Ezaki (1 person outside)