DENITRIFICATION DEVICE

• Main Authors: YANO KATSUMI, TANIGUCHI YUKIHISA
• Format: Patent
• Language: English; Japanese
• Published: 26.03.2020
• Subjects: BLASTING; COMBUSTION APPARATUS; COMBUSTION PROCESSES; ENGINE PLANTS IN GENERAL; FLUES; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNALCOMBUSTION ENGINES; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES ORENGINES IN GENERAL; HEATING; LIGHTING; MACHINES OR ENGINES IN GENERAL; MECHANICAL ENGINEERING; PERFORMING OPERATIONS; PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL; REMOVAL OR TREATMENT OF COMBUSTION PRODUCTS OR COMBUSTIONRESIDUES; SEPARATION; STEAM ENGINES; TRANSPORTING; WEAPONS

To suppress adhesion and accumulation of acidic ammonium sulfate to a device on the downstream side of a denitrification device and to reduce carbon monoxide in exhaust gas, while suppressing an increase in cost.MEANS FOR SOLVING THE PROBLEM: A first catalyst layer 11 is arranged on a gas flow passage 15, and carries a first catalyst for reducing and removing a nitride oxide in exhaust gas by using ammonia as a reducing agent. A second catalyst layer 12 is arranged on one gas flow passage 15 of at least one of the upstream or downstream of the first catalyst layer 11, and reduces and removes the nitride oxide in the exhaust gas by using carbon monoxide as a reducing agent. The second catalyst layer 12 has a catalyst-carrying region 21 which is arranged in at least four corner parts of a flow channel cross section of the gas flow passage 15 and carries a second catalyst, and a catalyst non-carrying region 22 which is arranged in the center part of the flow channel cross section of the gas flow passage 15 and does not carry the second catalyst, and a pressure loss of the flowing exhaust gas is equal to each other in the whole region of the flow channel cross section including the catalyst-carrying region 21 and the catalyst non-carrying region 22.SELECTED DRAWING: Figure 2 【課題】コストの上昇を抑制しつつ、脱硝装置の下流側の機器への酸性硫安の付着堆積の抑制と排ガス中の一酸化炭素の低減とを図る。【課題手段】第１触媒層１１は、ガス流通路１５に配置され、アンモニアを還元剤として排ガス中の窒素酸化物を還元除去する第１触媒を担持する。第２触媒層１２は、第１触媒層１１の上流側又は下流側の少なくとも一方のガス流通路１５に配置され、一酸化炭素を還元剤として排ガス中の窒素酸化物を還元除去する第２触媒を担持する。第２触媒層１２は、ガス流通路１５の流路断面の少なくとも４箇所の隅部に配置されて第２触媒を担持する触媒担持領域２１と、ガス流通路１５の流路断面の中央部に配置されて第２触媒を担持しない触媒非担持領域２２とを有し、触媒担持領域２１と触媒非担持領域２２とを含む流路断面の全域において、流通する排ガスの圧力損失が同等となるように構成されている。【選択図】図２