System and method for selective catalytic reduction of nitrogen oxides in combustion exhaust gases
    2.
    发明授权
    System and method for selective catalytic reduction of nitrogen oxides in combustion exhaust gases 有权
    用于选择性催化还原燃烧废气中氮氧化物的系统和方法

    公开(公告)号:US08691170B2

    公开(公告)日:2014-04-08

    申请号:US12122093

    申请日:2008-05-16

    IPC分类号: B01D53/56 B01D53/90

    摘要: A multi-stage selective catalytic reduction (SCR) unit (32) provides efficient reduction of NOx and other pollutants from about 50-550° C. in a power plant (19). Hydrogen (24) and ammonia (29) are variably supplied to the SCR unit depending on temperature. An upstream portion (34) of the SCR unit catalyzes NOx+NH3 reactions above about 200° C. A downstream portion (36) catalyzes NOx+H2 reactions below about 260° C., and catalyzes oxidation of NH3, CO, and VOCs with oxygen in the exhaust above about 200° C., efficiently removing NOx and other pollutants over a range of conditions with low slippage of NH3. An ammonia synthesis unit (28) may be connected to the SCR unit to provide NH3 as needed, avoiding transport and storage of ammonia or urea at the site. A carbonaceous gasification plant (18) on site may supply hydrogen and nitrogen to the ammonia synthesis unit, and hydrogen to the SCR unit.

    摘要翻译: 多级选择性催化还原(SCR)单元(32)在发电厂(19)中提供了大约50-550℃的NOx和其它污染物的有效还原。 氢(24)和氨(29)根据温度可变地供应到SCR单元。 SCR单元的上游部分(34)催化高于约200℃的NOx + NH 3反应。下游部分(36)催化低于约260℃的NOx + H 2反应,并催化NH 3,CO和VOC的氧化, 废气中的氧气高于约200℃,有效地在低氮NH3的条件下有效地除去NOx和其他污染物。 氨合成单元(28)可以连接到SCR单元以根据需要提供NH 3,避免在现场运输和储存氨或尿素。 现场的碳质气化设备(18)可向氨合成装置供应氢气和氮气,向SCR装置供应氢气。

    SMART AIR CLEANING SYSTEM AND METHOD THEREOF
    4.
    发明申请
    SMART AIR CLEANING SYSTEM AND METHOD THEREOF 有权
    智能空气清洁系统及其方法

    公开(公告)号:US20020193064A1

    公开(公告)日:2002-12-19

    申请号:US09888204

    申请日:2001-06-19

    IPC分类号: A62C002/06

    摘要: An air cleaning system and method employs both particulate and gaseous contaminant removal from a flowing air stream to improve air quality in a selected environmental space. Particulate contaminants are removed by an appropriate filter. Gaseous contaminants such as VOCs, CO, and O3 are removed using a catalyst to oxidize such contaminants. The air stream is selectively heated to provide an adequate catalyst reaction temperature and the heat energy is then recovered by a heat exchanger. Various sensors are employed to monitor flow rate, air composition, temperature and pressure. A controller is programmable to control air quality for either minimizing contaminants or minimizing energy usage required to achieve a selected minimum air quality over a period of time.

    摘要翻译: 空气净化系统和方法采用从流动空气流中除去颗粒物和气体污染物以改善所选择的环境空间中的空气质量。 颗粒污染物通过适当的过滤器去除。 使用催化剂除去气体污染物如VOC,CO和O 3以氧化这些污染物。 气流被选择性地加热以提供足够的催化剂反应温度,然后通过热交换器回收热能。 采用各种传感器来监测流速,空气组成,温度和压力。 控制器是可编程的,以控制空气质量,以最小化污染物或最小化在一段时间内实现所选择的最小空气质量所需的能量使用。