Title:
METHOD AND APPARATUS FOR TREATMENT OF EXHAUST GAS
Document Type and Number:
Japanese Patent JP3935547
Kind Code:
B2
Abstract:
PROBLEM TO BE SOLVED: To realize removal of mercury at a low cost by a method wherein combustion exhaust gas is reduced and denitrated in the presence of a solid catalyst by adding mercury chlorinating agent to the combustion gas containg NOx, SOx, and mercury, and then wetly desulfurized with alkali absorption liquid.
SOLUTION: An ammonia injection device 2 and an HCl injection device 4 are installed to a passage from a boiler 1 to a reducing denitration device 5, exhaust gas into which NH3 and HCl are injected therewith is reacted on NH3 and NOx with the reducing denitration device 5, and simultaneously metallic Hg is oxidized to HgCl2 under presence of NCl. Thereafter, for the exhaust gas, dust is removed with an electrostatic precipitator 8 via an air preheater 6, and a heat exchanger 7, and thereafter removal of SO2 in the exhaust gas and removal of HgCl2 are simultaneously executed with wet desulfurization equipment 9. Though excess HCl is contained in the exhaust gas coming out from the reducing denitration device 5, the HCl is absorbed in alkali aqueous solution with the denitration device 5, and not exhausted from a stack.
Inventors:
Kozo Iida
Takashina Toru
Shintaro Honjo
Takashina Toru
Shintaro Honjo
Application Number:
JP5097597A
Publication Date:
June 27, 2007
Filing Date:
February 19, 1997
Export Citation:
Assignee:
MITSUBISHI HEAVY INDUSTRIES,LTD.
International Classes:
B01J23/16; B01D53/50; B01D53/64; B01D53/77; B01D53/86; B01D53/94; B01J23/38; B01J23/70; (IPC1-7): B01D53/94; B01D53/50; B01D53/77; B01D53/86; B01J23/16; B01J23/38; B01J23/70
Domestic Patent References:
| JP8257363A | ||||
| JP62204830A | ||||
| JP7299331A | ||||
| JP4247221A | ||||
| JP5220345A |
Attorney, Agent or Firm:
Shoichi Okuyama
Arihara Koichi
Matsushima Tetsuo
Arihara Koichi
Matsushima Tetsuo