REDUCTANT SOLUTION MIXING DEVICE AND EXHAUST GAS AFTER-TREATMENT DEVICE INCLUDING THE SAME

• Main Authors: TAKAGI SHU, MUKOJIMA MIKA, KANDA TOSHIO
• Format: Patent
• Language: English; Japanese
• Published: 26.07.2018
• Subjects: BLASTING; ENGINE PLANTS IN GENERAL; 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; SEPARATION; STEAM ENGINES; TRANSPORTING; WEAPONS

PROBLEM TO BE SOLVED: To provide a reductant solution mixing device capable of efficiently removing urea deposit with a simple structure and without unnecessarily increasing power consumption.SOLUTION: A reductant solution mixing device is arranged on an upstream side of a selective reduction catalyst device, and configured to add reductant solution to exhaust gas. The reductant solution mixing device includes: an injector 25 configured to inject reductant solution into the exhaust gas; guide members 30A, 30B extending to an outward side of an injection port 25A, with the injection port 25A of the injector 25 as a base end, and configured to guide reductant solution accumulated at the injection port 25A; and a heating member 32 provided at the tips of the guide members 30A, 30B, and configured to heat the reductant solution guided by the guide members 30A, 30B to dissolve reductant.SELECTED DRAWING: Figure 6 【課題】簡素な構造で、電力消費量を必要以上に増大させることがなく、尿素デポジットを効率的に除去できる還元剤水溶液ミキシング装置を提供すること。【解決手段】選択還元触媒装置の上流側に配置され、排気ガス中に還元剤水溶液を添加する還元剤水溶液ミキシング装置は、排気ガス中に還元剤水溶液を噴射するインジェクタ２５と、インジェクタ２５の噴射口２５Ａを基端とし、噴射口２５Ａの外方に向けて延び、噴射口２５Ａに滞留した還元剤水溶液を案内する案内部材３０Ａ、３０Ｂと、案内部材３０Ａ、３０Ｂの先端に設けられ、案内部材３０Ａ、３０Ｂにより案内された還元剤水溶液を加熱して、還元剤を分解する加熱部材３２とを備えている。【選択図】図６