Selective Catalytic NOx Reduction Process and Control System
    21.
    发明申请
    Selective Catalytic NOx Reduction Process and Control System 有权
    选择性催化NOx还原过程和控制系统

    公开(公告)号:US20130039827A1

    公开(公告)日:2013-02-14

    申请号:US13568411

    申请日:2012-08-07

    IPC分类号: B01D53/56

    摘要: A process and an apparatus enhance urea utilization for selective catalytic reduction (SCR) of NOx, by controlled preparation and feed of gasified urea during combustor load variation. The concentration of NOx in the combustion gases and a required total gas flow necessary to supply an SCR reactor with NOx reducing and carrier gases are determined. Urea is gasified by gasification gases in a thermal gasification reactor. The resulting urea gasification products are mixed with carrier gases to provide an injection grid supply stream. Heating is reduced and flue gas enthalpy is efficiently used by controls utilizing monitoring the temperatures of gases fed to the thermal gasification reactor and of the stream of carrier gases.

    摘要翻译: 一种方法和装置通过在燃烧器负荷变化期间通过控制制备和气化尿素进料来增强NOx的选择性催化还原(SCR)的尿素利用。 确定燃烧气体中的NOx浓度以及向SCR反应器供应NOx还原和载气所需的总气体流量。 尿素在热气化反应器中由气化气体气化。 所得到的尿素气化产物与载气混合以提供注入电网供应流。 通过控制利用监测进入热气化反应器和载气流的气体的温度有效地使用烟道气焓。

    Selective Catalytic Reduction of NOx Enabled by Urea Decomposition Heat-Exchanger Bypass
    22.
    发明申请
    Selective Catalytic Reduction of NOx Enabled by Urea Decomposition Heat-Exchanger Bypass 有权
    通过尿素分解换热器旁路选择性催化还原NOx

    公开(公告)号:US20100055014A1

    公开(公告)日:2010-03-04

    申请号:US12615622

    申请日:2009-11-10

    IPC分类号: B01D53/56 B01J8/00 B01D53/74

    摘要: Disclosed are a process and apparatus for selective catalytic reduction of NOx. The process is enabled by bypassing a heat exchanger section, such as an economizer, of the boiler in advance of an SCR unit at low load conditions to enable NOx reduction even at low loads using urea instead of ammonia. In a preferred form, under high load conditions, the bypass can be almost fully closed and the economizer can be operated normally without excessively cooling the combustion gases, using only a portion of bypassed gases which are hot enough to decompose the urea into its active components including ammonia.

    摘要翻译: 公开了用于NOx的选择性催化还原的方法和装置。 该过程通过在低负载条件下绕过SCR单元之前的锅炉的热交换器部分(例如节能器)来实现,使得即使在低负载下使用尿素代替氨也能够降低NOx。 在优选形式中,在高负载条件下,旁路可以几乎完全关闭,并且节能器可以正常运行而不会过度冷却燃烧气体,仅使用足够热的一部分旁路气体将尿素分解成其活性组分 包括氨。

    Selective catalytic reduction of NOx enabled by urea decomposition in heat-exchanger bypass
    23.
    发明授权
    Selective catalytic reduction of NOx enabled by urea decomposition in heat-exchanger bypass 有权
    在热交换器旁路中通过尿素分解进行选择性催化还原NOx

    公开(公告)号:US07615200B2

    公开(公告)日:2009-11-10

    申请号:US11695971

    申请日:2007-04-03

    IPC分类号: B01D53/56 B01D53/74

    摘要: Disclosed are a process and apparatus for selective catalytic reduction of NOx. The process is enabled by passing a heat exchanger section, such as an economizer, of the boiler in advance of an SCR unit at low load conditions to enable NOx reduction even at low loads using urea instead of ammonia. In a preferred form, under high load conditions, the bypass can be almost fully closed and the economizer can be operated normally without excessively cooling the combustion gases, using only a portion of bypassed gases which are hot enough to decompose the urea into its active components including ammonia.

    摘要翻译: 公开了用于NOx的选择性催化还原的方法和装置。 该过程是通过在低负载条件下通过SCR单元之前通过锅炉的热交换器部分来实现的,以使即使在使用尿素而不是氨的低负载下也能够降低NOx。 在优选形式中,在高负载条件下,旁路可以几乎完全关闭,并且节能器可以正常运行而不会过度冷却燃烧气体,仅使用足够热的一部分旁路气体将尿素分解成其活性组分 包括氨。

    Highly efficient hybrid process for nitrogen oxides reduction
    24.
    发明授权
    Highly efficient hybrid process for nitrogen oxides reduction 失效
    氮氧化物还原的高效混合工艺

    公开(公告)号:US5286467A

    公开(公告)日:1994-02-15

    申请号:US907222

    申请日:1992-07-01

    CPC分类号: B01D53/8625 B01D53/56

    摘要: A process for reducing nitrogen oxides in a combustion effluent is presented. The process involves introducing a nitrogenous treatment agent other than ammonia into the effluent to create a treated effluent having reduced nitrogen oxides concentration such that ammonia is present in the treated effluent; introducing a source of ammonia into the effluent; and contacting the treated effluent with a nitrogen oxides reducing catalyst.

    摘要翻译: 提出了一种用于还原燃烧流出物中的氮氧化物的方法。 该方法包括将不同于氨的含氮处理剂引入流出物中以产生具有降低的氮氧化物浓度的经处理的流出物,使得经处理的流出物中存在氨; 在流出物中引入氨源; 并将经处理的流出物与氮氧化物还原催化剂接触。

    Process for nitrogen oxides reduction to lowest achievable level
    25.
    发明授权
    Process for nitrogen oxides reduction to lowest achievable level 失效
    将氮氧化物还原成最低可达水平的方法

    公开(公告)号:US5229090A

    公开(公告)日:1993-07-20

    申请号:US725183

    申请日:1991-07-03

    IPC分类号: B01D53/56

    CPC分类号: B01D53/56

    摘要: A system for the reduction of nitrogen oxides in the effluent from the combustion of a carbonaceous fuel is presented. This system utilizes means for determining the lowest achievable nitrogen oxides concentration with respect to a treatment agent to be introduced into the effluent; means for determining whether the baseline nitrogen oxides concentration at the point of introduction is above the lowest achievable nitrogen oxides concentration; and means for introducing the treatment agent into the effluent under conditions effective to reduce the effluent nitrogen oxides concentration.

    摘要翻译: 提出了一种用于还原来自碳质燃料燃烧的流出物中的氮氧化物的系统。 该系统利用相对于待引入流出物的处理剂确定最低可实现的氮氧化物浓度的手段; 用于确定引入点的基准氮氧化物浓度是否高于最低可实现的氮氧化物浓度的手段; 以及用于在有效降低流出物氮氧化物浓度的条件下将处理剂引入流出物的装置。

    Catalytic/non-catalytic combination process for nitrogen oxides reduction
    26.
    发明授权
    Catalytic/non-catalytic combination process for nitrogen oxides reduction 失效
    用于氮氧化物还原的催化/非催化组合方法

    公开(公告)号:US5139754A

    公开(公告)日:1992-08-18

    申请号:US626439

    申请日:1990-12-12

    IPC分类号: B01D53/56 B01D53/86

    CPC分类号: B01D53/8625 B01D53/56

    摘要: A process for reducing nitrogen oxides in a combusiton effluent is presented. The process involves introducing a nitrogenous treatment agent into the effluent under conditions effective to create a treated effluent having reduced nitrogen oxides concentration such that ammonia is present in the treated effluent; and then contacting the treated effluent under conditions effective to reduce the nitrogen oxides in the effluent with a nitrogen oxides reducing catalyst.

    摘要翻译: 提出了一种还原氮气氧化物的方法。 该方法包括在有效地产生具有降低的氮氧化物浓度的经处理的流出物的条件下将氮处理剂引入流出物中,使得氨在经处理的流出物中存在; 然后在有效降低流出物中的氮氧化物的条件下与氮氧化物还原催化剂接触处理的流出物。

    Process for reducing nitrogen oxides without generating nitrous oxide
    27.
    发明授权
    Process for reducing nitrogen oxides without generating nitrous oxide 失效
    减少氮氧化物而不产生一氧化二氮的方法

    公开(公告)号:US4997631A

    公开(公告)日:1991-03-05

    申请号:US489919

    申请日:1990-03-07

    IPC分类号: B01D53/56

    CPC分类号: B01D53/56 Y02C20/10

    摘要: A process is presented for the reduction of nitrogen oxides in the effluent from the combustion of a carbonaceous fuel while reducing the generation of nitrous oxide. The process comprises introducing a treatment agent comprising ammonium carbamate into the effluent in an amount effective to substantially avoid the presence of nitrous oxide.

    摘要翻译: 提出了一种减少来自碳质燃料燃烧的流出物中的氮氧化物同时减少一氧化二氮的产生的方法。 该方法包括将含有氨基甲酸铵的处理剂以有效基本避免一氧化二氮存在的量引入流出物中。