EXHAUST GAS TREATMENT EQUIPMENT

• Main Authors: YASHIRO KATSUHIRO, KAI KEIICHIRO, UENISHI MASATO, MATSUYAMA KOTOE, YOKOYAMA KOICHI
• Format: Patent
• Language: English; Japanese
• Published: 13.08.2020
• Subjects: BLASTING; CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOIDCHEMISTRY; COMBUSTION APPARATUS; COMBUSTION PROCESSES; FLUES; HEATING; LIGHTING; MECHANICAL ENGINEERING; METHODS OF STEAM GENERATION; PERFORMING OPERATIONS; PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL; REMOVAL OR TREATMENT OF COMBUSTION PRODUCTS OR COMBUSTIONRESIDUES; SEPARATION; STEAM BOILERS; STEAM GENERATION; THEIR RELEVANT APPARATUS; TRANSPORTING; WEAPONS

To provide an exhaust gas purifier which satisfactorily suppresses production of acidic ammonium sulfate at exhaust gas low temperature time with simple configuration.SOLUTION: A denitration catalyst packed layer for reducing and removing nitrogen oxide in exhaust gas with ammonia or urea as a reductant is located in a gas flow passage 18 in which exhaust gas, which has been discharged from a furnace of a circulation type drum boiler 1 for heating water derived from a drum 4 by the furnace and returning the same to the drum 4, flows. Ammonia or urea is injected into exhaust gas flowing in the gas flow passage on an upstream side of the denitration catalyst packed layer. A heat exchanger 30 is located in the gas flow passage 18 on the upstream side of the denitration catalyst packed layer (denitration device 20), and a heat medium introduction pipe 33 introduces water in the drum 4 into the heat exchanger 30. Water introduced from the heat medium introduction pipe 33 flows in the heat exchanger 30 as a heat medium.SELECTED DRAWING: Figure 1 【課題】排ガス低温時の酸性硫安の生成を簡易な構成によって好適に抑制する、排ガス浄化装置の提供。【解決手段】ドラム４から導出した水を火炉で加熱してドラム４へ戻す循環型ドラムボイラ１の火炉から排出された排ガスが流通するガス流通路１８には、アンモニア又は尿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脱硝触媒充填層が配置され、脱硝触媒充填層の上流側のガス流通路を流通する排ガス中には、アンモニア又は尿素が注入される。熱交換器３０は、脱硝触媒充填層（脱硝装置２０）の上流側のガス流通路１８に配置され、熱媒導入管３３は、ドラム４内の水を熱交換器３０へ導入する。熱媒導入管３３から導入された水は、熱交換器３０の内部を熱媒として流通する。【選択図】図１