公开(公告)号：US5270025A

公开(公告)日：1993-12-14

申请号：US858316

申请日：1992-03-25

申请人： Loc Ho ,  Shih L. Chen ,  William R. Seeker ,  Peter M. Maly

发明人： Loc Ho ,  Shih L. Chen ,  William R. Seeker ,  Peter M. Maly

IPC分类号： B01D53/56 ,  C01B21/00 ,  B01J8/00 ,  C01B17/00 ,  C01B17/20

CPC分类号： B01D53/56 ,  Y02C20/10

摘要： Method for controlling N.sub.2 O emissions from stationary combustion systems having variable flue gas temperatures are disclosed. The N.sub.2 O emissions are controlled by the introduction of a N.sub.2 O control agent, such as an alkaline compound, into the effluent stream. In addition, the present invention discloses methods for controlling N.sub.2 O emissions from stationary combustion systems having variable flue gas temperatures while reducing NO.sub.x emissions. Use of an NO.sub.x reducing agent and an N.sub.2 O control agent, such as urea and monosodium glutamate, enlarges the temperature window for effective selective noncatalytic NO.sub.x reduction while significantly eliminating N.sub.2 O emissions commonly experienced with urea injection. Further, the present invention discloses methods for controlling N.sub.2 O emissions from stationary combustion systems having variable flue gas temperatures while reducing SO.sub.x emissions. Use of an NO.sub.x reducing agent, an SO.sub.x reducing agent, and an N.sub.2 O control agent, such as urea, an alkaline-earth metal compound, and an alkali-metal compound, respectively, enlarges the temperature window for effective NO.sub.x and SO.sub.x reductions while significantly eliminating N.sub.2 O emissions.

摘要翻译： 公开了用于控制具有可变烟道气温度的固定燃烧系统的N2O排放的方法。 通过在流出物流中引入N2O控制剂，例如碱性化合物来控制N2O排放。 此外，本发明公开了用于控制具有可变烟道气温度的固定燃烧系统的N2O排放的方法，同时减少NOx排放。 使用NO x还原剂和N2O控制剂，如尿素和谷氨酸钠，可以扩大用于有效选择性非催化NOx还原的温度窗口，同时显着消除尿素喷射通常经历的N2O排放。 此外，本发明公开了用于控制具有可变烟道气温度的固定燃烧系统的N2O排放的方法，同时减少SO x排放。 分别使用NO x还原剂，SOx还原剂和N2O控制剂，如尿素，碱土金属化合物和碱金属化合物，可大大增加有效NOx和SOx还原的温度窗口 消除N2O排放。

公开(公告)号：US5116584A

公开(公告)日：1992-05-26

申请号：US681697

申请日：1991-04-05

申请人： Shih L. Chen ,  William R. Seeker ,  Loc Ho

发明人： Shih L. Chen ,  William R. Seeker ,  Loc Ho

IPC分类号： B01D53/56

CPC分类号： B01D53/56

摘要： Methods for reducing NO.sub.x emissions from stationary combustion systems having variable flue gas temperatures are disclosed. Use of an annonium salt of an organic acid enlarges the temperature window for effective selective noncatalytic NO.sub.x reduction thereby accounting for variable flue gas temperatures. Currently preferred ammonium salts of organic acids include ammonium formate, ammonium acetate, and ammonium oxalate. Mixtures of urea and either an ammonium salt of an organic acid or a metallic salt of an organic acid provide an even greater temperature window for NO.sub.x reduction. Currently preferred metallic salts of organic acids include Ca(COOH).sub.2, Ca(CH.sub.3 COO).sub.2, Ca(C.sub.2 H.sub.5 COO).sub.2, Mg(COOH).sub.2, Mg(CH.sub.3 COO).sub.2, and Mg(C.sub.2 H.sub.5 COO).sub.2.

摘要翻译： 公开了用于减少具有可变烟道气温度的固定燃烧系统的NOx排放的方法。 使用有机酸的onium盐可以扩大用于有效选择性非催化NOx还原的温度窗口，从而考虑可变的烟气温度。 目前优选的有机酸铵盐包括甲酸铵，乙酸铵和草酸铵。 脲和有机酸的铵盐或有机酸的金属盐的混合物为NOx还原提供了更大的温度窗口。 目前优选的有机酸金属盐包括Ca（COOH）2，Ca（CH 3 COO）2，Ca（C 2 H 5 COO）2，Mg（COOH）2，Mg（CH 3 COO）2和Mg（C 2 H 5 COO）2）。

公开(公告)号：US5139755A

公开(公告)日：1992-08-18

申请号：US674752

申请日：1991-03-22

申请人： William R. Seeker ,  Shih L. Chen ,  John C. Kramlich

发明人： William R. Seeker ,  Shih L. Chen ,  John C. Kramlich

IPC分类号： B01D53/56

CPC分类号： B01D53/56

摘要： Techniques for enhancing the burnout zone chemistry for NO.sub.x reduction are disclosed. The key parameters for the enhancement of burnout zone chemistry are: (a) a reaction temperature in the range from about 1300.degree. F. to about 1900.degree. F., and optimally in the range from 1400.degree.-1700.degree. F.; (b) a carbon monoxide concentration below about 0.5 percent; and (c) the presence of nitrogenous reducing species. By controlling the stoichiometry associated with reburning to produce a slightly fuel-rich region for selective reducing agent injection, reductions can be achieved at relatively low temperatures which approach those obtained by conventional catalytic reduction.

摘要翻译： 公开了用于增强用于NOx还原的燃烧区化学的技术。 用于增强燃烧区化学的关键参数是：（a）反应温度在约1300°F至约1900°F范围内，最优选在1400°-1700°F范围内。 （b）一氧化碳浓度低于约0.5％; 和（c）含氮还原物质的存在。 通过控制与重燃相关的化学计量，以产生用于选择性还原剂注入的略微富含燃料的区域，可以在相对较低的温度下实现降低，其接近通过常规催化还原获得的那些。