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    • 16. 发明授权
    • Method for removing nitrogen oxides from exhaust gas
    • 从废气中除去氮氧化物的方法
    • US06432373B1
    • 2002-08-13
    • US08429767
    • 1995-04-27
    • Satoshi TanazawaKen-ichiro KobayashiHiroaki HayashiMotonobu Kobayashi
    • Satoshi TanazawaKen-ichiro KobayashiHiroaki HayashiMotonobu Kobayashi
    • B01J800
    • B01D53/8631B01J19/26B01J2208/00548B01J2208/00884B01J2219/00094B01J2219/00119B01J2219/00252
    • In an apparatus for selectively reduction-removing nitrogen oxides in exhaust gas in presence of catalyst by spraying aqueous solid reducing agent solution into exhaust gas flowing through a duct to mix the reducing agent into exhaust gas, the present invention prevents nozzle-clogging caused by the reducing agent or its reaction product, permits stable and continuous spraying and uniform mixing of the reducing agent solution into exhaust gas, and thus removes nitrogen oxides at a high efficiency. The nozzle is cooled by supplying at least one of water and gas before supplying the solution into the nozzle. Upon discontinuing supply of the solution to the nozzle, at least one of water and gas is supplied to remove the solution remaining in the nozzle. The solution stored at high concentration is sprayed after diluting it with water in the course of transfer for spraying. A line for supplying water for diluting is added to the line for supplying the solution. On the side peripheral surface of the duct, a nozzle having double-tube structure comprising an inner and an outer tube in which the inner tube tip projects by 1 to 5 mm from the outer tube tip is installed, the solution is supplied into the nozzle inner tube and spray gas is supplied between the inner and outer tubes to spray the solution to exhaust gas.
    • 在催化剂存在下通过将固体还原剂水溶液喷射到通过管道的废气中进行选择性还原除去氮氧化物的装置中,将还原剂混合到废气中,本发明防止由于 还原剂或其反应产物允许稳定和连续的喷雾和还原剂溶液均匀混合到废气中,从而以高效率除去氮氧化物。 在将溶液供入喷嘴之前,通过供应水和气体中的至少一种来冷却喷嘴。 在停止向喷嘴供应溶液时,供应水和气中的至少一种以除去留在喷嘴中的溶液。 在喷雾转移过程中用水稀释高浓度储存的溶液。 将用于稀释的水的管线添加到用于供应溶液的管线中。 在管道的侧面上安装有具有双管结构的喷嘴,其包括内管末端与内管尖端突出1〜5mm的内管和外管,将溶液供给到喷嘴 在内管和外管之间供应内管和喷雾气体以将溶液喷射到废气中。