Title:
COMBUSTION EXHAUST GAS TREATMENT METHOD AND COMBUSTION EXHAUST GAS TREATMENT APPARATUS
Document Type and Number:
WIPO Patent Application WO/2022/196728
Kind Code:
A1
Abstract:
This combustion exhaust gas treatment method comprises: a dry-mode treatment step for adding an alkali agent to an untreated combustion exhaust gas containing an acidic gas to neutralize the acidic gas, thereby producing an alkali-treated combustion exhaust gas; a dust collection step for supplying the alkali-treated combustion exhaust gas to a dust collector to collect fly ash; and a heavy metal fixation step for discharging the fly ash from the dust collector and adding a heavy metal fixing agent to the fly ash to fix a heavy metal in the fly ash. In the method, the concentration of the acidic gas in the untreated combustion exhaust gas is measured, the amount of the alkali agent to be added to the untreated combustion exhaust gas is calculated on the basis of a measurement value of the concentration of the acidic gas, and the alkali agent is added in the calculated amount, and the concentration of the unreacted alkali agent in the fly ash discharged from the dust collector is calculated, the amount of the heavy metal fixing agent to be added to the fly ash is calculated on the basis of a calculation value of the concentration of the unreacted alkali agent, and the heavy metal fixing agent is added in the calculated amount.
Inventors:
ITOU ICHIROU (JP)
FUJIYOSHI NAOAKI (JP)
FUJITA SATOSHI (JP)
FUJIYOSHI NAOAKI (JP)
FUJITA SATOSHI (JP)
Application Number:
PCT/JP2022/011912
Publication Date:
September 22, 2022
Filing Date:
March 16, 2022
Export Citation:
Assignee:
KURITA WATER IND LTD (JP)
International Classes:
B01D53/40; B01D53/50; B01D53/64; B01D53/68; B01D53/83; F23J15/00
Foreign References:
| JP2013017956A | 2013-01-31 | |||
| JP2020110773A | 2020-07-27 | |||
| JP2020006330A | 2020-01-16 | |||
| JPH09248542A | 1997-09-22 | |||
| JP2010234175A | 2010-10-21 |
Attorney, Agent or Firm:
OHTANI PATENT OFFICE (JP)
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