Title:
EXHAUST GAS TREATMENT SYSTEM AND METHOD
Document Type and Number:
WIPO Patent Application WO/2014/073268
Kind Code:
A1
Abstract:
This exhaust gas treatment system has: a denitrification device (14) that is provided in a flue (13) through which an exhaust gas (12) from a boiler (11) is discharged and that removes nitrogen oxides from the exhaust gas (12); an SO2·SO3 conversion catalyst unit (15) that is provided in the flue (13) on the wake side of the denitrification device (14) and that has a conversion catalyst which converts SO2 (sulfur dioxide) in the denitrified exhaust gas (12A) into SO3 (sulfur trioxide); a heat exchanger (16) that is provided in the flue (13) on the wake side of the SO2·SO3 conversion catalyst unit (15) and that conducts heat exchange between the exhaust gas (12B), which has passed through the catalyst, and air (20) to lower the temperature of the exhaust gas (12B) to a sulfuric acid dew point or lower and that makes dust and soot adhere to the surfaces of sulfuric acid droplets contained in the exhaust gas, the temperature of which has been lowered to a sulfuric acid dew point or lower in the heat exchanger (16); and a dust collector (17) that collets not only the dust- and soot-covered sulfuric acid but also dust and soot contained in the exhaust gas (12C). In the exhaust gas treatment system, the desulfurization of an exhaust gas is attained by: catalytically converting SO2 contained in an exhaust gas into SO3; subjecting the SO3-containing exhaust gas to heat exchange with air in a heat exchanger to lower the temperature of the exhaust gas to a sulfuric acid dew point or lower; making dust and soot adhere to the surfaces of sulfuric acid droplets contained in the exhaust gas; and collecting the dust- and soot-covered sulfuric acid together with dust and soot by a dust collector.
Inventors:
USHIKU TETSU (JP)
NAGAYASU TATSUTO (JP)
KAGAWA SEIJI (JP)
NAGAYASU TATSUTO (JP)
KAGAWA SEIJI (JP)
Application Number:
PCT/JP2013/074710
Publication Date:
May 15, 2014
Filing Date:
September 12, 2013
Export Citation:
Assignee:
MITSUBISHI HEAVY IND LTD (JP)
International Classes:
B01D53/86; B01D53/34; B01D53/50
Domestic Patent References:
| WO2008078721A1 | 2008-07-03 |
Foreign References:
| JP2011110480A | 2011-06-09 | |||
| JPS60225624A | 1985-11-09 | |||
| JP2000070666A | 2000-03-07 | |||
| JP2009291734A | 2009-12-17 | |||
| JPH11347363A | 1999-12-21 | |||
| JP2013142501A | 2013-07-22 | |||
| JP2013202422A | 2013-10-07 | |||
| JP2006326575A | 2006-12-07 |
Attorney, Agent or Firm:
SAKAI, Hiroaki et al. (JP)
Hiroaki Sakai (JP)
Hiroaki Sakai (JP)
Download PDF:
Previous Patent: CERAMIC HEATER TYPE GLOW PLUG
Next Patent: SPOUT, PACKAGING BODY WITH SPOUT, AND METHOD FOR MANUFACTURING PACKAGING BODY
Next Patent: SPOUT, PACKAGING BODY WITH SPOUT, AND METHOD FOR MANUFACTURING PACKAGING BODY