DENITRIFICATION APPARATUS

• Main Authors: YANO KATSUMI, TANIGUCHI YUKIHISA
• Format: Patent
• Language: Chinese; English
• Published: 09.04.2021
• 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

A first catalytic layer 11 is disposed in a gas flow passage 15 and is loaded with a first catalyst for reducing and removing nitrogen oxides in exhaust gas using ammonia as a reducing agent. A second catalytic layer 12 is disposed in the gas flow passage 15 on the upstream-side and/or the downstream-side of the first catalytic layer 11 and is loaded with a second catalyst for reducing and removing nitrogen oxides in the exhaust gas using carbon monoxide as a reducing agent. The second catalytic layer 12: has catalyst-loaded regions 21, which are disposed at least in the four corners of flow channel cross-sections of the gas flow passage 15 and in which the second catalyst is loaded, and a non-catalyst-loaded region 22, which is disposed in the center of flow channel cross-sections of the gas flow passage 15 and in which the second catalyst is not loaded; and is configured so that in the entire flow channel cross-section comprising the catalyst-loaded regions 21 and the non-catalyst-loaded region 22, the pres