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    • 4. 发明申请
    • EXHAUST GAS DENITRATION METHOD
    • 排气净化方法
    • WO1998002234A1
    • 1998-01-22
    • PCT/JP1997002388
    • 1997-07-10
    • MITSUBISHI HEAVY INDUSTRIES, LTD.OSAKA GAS COMPANY LIMITEDMOCHIDA, IsaoYASUTAKE, AkinoriSETOGUCHI, ToshihikoKOBAYASHI, NorihisaNAKAMURA, HitoshiKASUH, TakahiroYOSHIKAWA, Masaaki
    • MITSUBISHI HEAVY INDUSTRIES, LTD.OSAKA GAS COMPANY LIMITED
    • B01D53/86
    • B01D53/8631
    • A method for denitration of combustion exhaust gas suitable for countermeasure for a low temperature exhaust gas produced at a start-up of a combustion device or for denitration of a low temperature part of the exhaust gas. The denitration method, in which denitration is performed by passing a combustion exhaust gas through an ammonia reduction denitration apparatus, comprises the steps of installing a bypass provided with a low temperature denitration apparatus and disposed on the downstream side of the ammonia reduction denitration apparatus in an exhaust gas flow passage, causing the low temperature denitration apparatus to perform denitration by passing the exhaust gas through the bypass when an exhaust gas temperature is low, causing the ammonia reduction denitration apparatus to perform denitration at a point of time when the ammonia reduction denitration apparatus comes to function fully, and regenerating a catalyst of the low temperature denitration apparatus while the bypass is closed. Further, the denitration method can perform denitration and regeneration of the catalyst by successively switching between low temperature denitration apparatuses of more than one systems which are installed in parallel in an area where a temperature of the exhaust gas in the exhaust gas flow passage ranges from room temperature to 200 DEG C.
    • 一种用于对燃烧装置启动时产生的低温废气或排气的低温部分进行脱硝的对策的燃烧废气脱硝方法。 通过使排气通过氨还原脱硝装置进行脱硝的脱硝方法包括以下步骤:将设置有低温脱硝装置的旁路安装在氨还原脱硝装置的下游侧, 排气流路,当排气温度低时使低温脱硝装置通过排气通过旁路进行脱硝,使氨还原脱硝装置在氨还原脱硝装置的时间点进行脱硝 充分发挥作用,在旁路关闭的同时再生低温脱硝装置的催化剂。 此外,脱硝方法可以通过在排气流路中的废气的温度为室内的并排安装的多个系统的低温脱硝装置之间连续切换来进行催化剂的脱硝和再生 温度至200℃