CN109442393A - 超临界co2试验锅炉的引入烟气再循环系统及循环方法 - Google Patents
超临界co2试验锅炉的引入烟气再循环系统及循环方法 Download PDFInfo
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- UGFAIRIUMAVXCW-UHFFFAOYSA-N carbon monoxide Chemical compound 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Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23C—METHODS OR APPARATUS FOR COMBUSTION USING FLUID FUEL OR SOLID FUEL SUSPENDED IN A CARRIER GAS OR AIR
- F23C9/00—Combustion apparatus characterised by arrangements for returning combustion products or flue gases to the combustion chamber
- F23C9/06—Combustion apparatus characterised by arrangements for returning combustion products or flue gases to the combustion chamber for completing combustion
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23C—METHODS OR APPARATUS FOR COMBUSTION USING FLUID FUEL OR SOLID FUEL SUSPENDED IN A CARRIER GAS OR AIR
- F23C9/00—Combustion apparatus characterised by arrangements for returning combustion products or flue gases to the combustion chamber
- F23C9/08—Combustion apparatus characterised by arrangements for returning combustion products or flue gases to the combustion chamber for reducing temperature in combustion chamber, e.g. for protecting walls of combustion chamber
Abstract
一种超临界CO2试验锅炉的引入烟气再循环系统及循环方法。目前，新型20MW超临界CO2试验锅炉，采用常规燃气燃烧器，火焰集中，导致火焰的中心温度较高，产生大量热力型的NOx，且很难实现燃烧分级有效降低NOx。一种超临界CO2试验锅炉的引入烟气再循环系统，其组成包括：锅炉（1）、锅炉水平烟道（2）、空气预热器（3）和燃气燃烧器（4），锅炉采用L型布置方式，且顶部设置有燃气燃烧器，燃气燃烧器采用炉顶下冲方式布置，锅炉的一侧与锅炉水平烟道连接，锅炉水平烟道为双烟道结构布置，锅炉水平烟道的尾部设置有烟气挡板（5），烟气挡板的另一侧与空气预热器连接。本发明应用于锅炉领域。
Description
技术领域：
本发明涉及一种超临界CO2试验锅炉的引入烟气再循环系统。
背景技术：
目前，新型20MW超临界CO2试验锅炉，采用常规燃气燃烧器，火焰集中，导致火焰的中心温度较高，火焰局部温度过高产生大量热力型的NOx，且很难实现燃烧分级有效降低NOx。鉴于环保标准日益提高，NOx排放难以满足最新环保标准要求。针对新型20MW超临界CO2试验锅炉，采用引入烟气再循环的方式，可有效降低燃气燃烧器NOx的排放量。
本发明涉及一种超临界CO2试验锅炉的引入烟气再循环系统及循环方法。
发明内容：
本发明的目的是提供一种超临界CO2试验锅炉的引入烟气再循环系统，针对新型20MW超临界CO2试验锅炉，采用引入烟气再循环的方式，可有效降低燃气燃烧器NOx的排放量。
上述的目的通过以下的技术方案实现：
一种超临界CO2试验锅炉的引入烟气再循环系统，其组成包括：锅炉、锅炉水平烟道、空气预热器和燃气燃烧器，所述的锅炉采用L型布置方式，且顶部设置有所述的燃气燃烧器，所述的燃气燃烧器采用炉顶下冲方式布置，所述的锅炉的一侧与所述的锅炉水平烟道连接，所述的锅炉水平烟道为双烟道结构布置，所述的锅炉水平烟道的尾部设置有烟气挡板，所述的烟气挡板的另一侧与所述的空气预热器连接，所述的烟气在循环风机的抽烟气口位于分流省煤器的出口位置。
所述的超临界CO2试验锅炉的引入烟气再循环系统，所述的锅炉水平烟道的右侧设置有一级过热器和二级过热器，所述的水平烟道的左侧设置有一级再热器和二级再热器，所述的一级过热器和所述的二级过热器连接，所述的一级再热器和所述的二级再热器连接。
所述的超临界CO2试验锅炉的引入烟气再循环系统，所述的分流省煤器分为过热器侧分流省煤器和再热器侧分流省煤器两个部分，所述的过热器侧分流省煤器设置在所述的锅炉水平烟道的右侧，所述的再热器侧分流省煤器设置在所述的锅炉水平烟道的左侧。
所述的超临界CO2试验锅炉的引入烟气再循环系统，所述的过热器侧分流省煤器和所述的再热器侧分流省煤器采用并联方式连接。
所述的超临界CO2试验锅炉的引入烟气再循环系统，所述的锅炉采用20MW试验锅炉，所述的空气预热器采用管式空气预热器。
所述的超临界CO2试验锅炉的引入烟气再循环系统及循环方法，其特征是:该方法包括如下步骤：
（1）工质流程：一部分约主流的10%经过分流省煤器加热后，在进入气冷壁进口集箱前与主流混合，混合后的工质从气冷壁进口集箱引入到垂直管圈气冷壁，从气冷壁出口集箱引出的工质依次进入两级过热器加热至额定参数600℃。
（2）风烟流程：来自送风机的冷空气，经管式空气预热器加热后，与送入炉膛的燃气混合燃烧，产生的热烟气向下在水平分隔烟道分成两路，依次经二级过热器和二级再热器、一级过热器和一级再热器及两侧的并联形式的分流省煤器，并在省煤器出口烟道汇合，再通过空气预热器离开锅炉。
本发明的有益效果：
1.本发明针对超临界CO2为工质的20MW试验锅炉，锅炉采用“L”型布置方式，燃气燃烧器采用炉顶下冲布置方式，锅炉水平烟道为双烟道布置，过热器位于水平烟道右侧烟道内，两级布置，再热器位于水平烟道左侧烟道内，两级布置，分流省煤器分成两部分，一部分布置在右侧烟道，另一部分布置在左侧烟道。尾部设置烟道挡板，采用烟气再循环技术，烟气再循环的抽烟气口位于分流省煤器出口，将抽出的烟气引入到空气预热器出口处，与一次风混合后送入炉内。
本发明针对超临界CO2为工质的20MW试验锅炉，采用从省煤器尾部抽取烟气与一次风混合进入炉内，既可以降低燃烧温度，又可以降低氧气浓度，因而可以有效减低NOx的排放浓度。
本发明的工质流程分为两部分，一部分约主流的10%经过分流省煤器加热后，在进入气冷壁进口集箱前与主流混合。混合后的工质从气冷壁进口集箱引入到垂直管圈气冷壁，从气冷壁出口集箱引出的工质依次进入两级过热器加热至额定参数600℃。
本发明风烟流程来自送风机的冷空气，经管式空气预热器加热后，与送入炉膛的燃气混合燃烧，产生的热烟气向下在水平分隔烟道分成两路，依次经二级过热器（再热器）、一级过热器（再热器）及两侧的并联形式的分流省煤器，并在省煤器出口烟道汇合，再通过空气预热器离开锅炉。
附图说明：
附图1是本发明的结构示意图。
附图2是本发明的锅炉水平烟道俯视图。
图中：1、锅炉，2、锅炉水平烟道，3、空气预热器，4、燃气燃烧器，5、烟气挡板，6、烟气在循环风机，7、一级过热器，8、二级过热器，9、一级再热器，10、二级再热器，11、过热器侧分流省煤器，12、再热器侧分流省煤器。
具体实施方式：
实施例1：
一种超临界CO2试验锅炉的引入烟气再循环系统，其组成包括：锅炉1、锅炉水平烟道2、空气预热器3和燃气燃烧器4，所述的锅炉采用L型布置方式，且顶部设置有所述的燃气燃烧器，所述的燃气燃烧器采用炉顶下冲方式布置，所述的锅炉的一侧与所述的锅炉水平烟道连接，所述的锅炉水平烟道为双烟道结构布置，所述的锅炉水平烟道的尾部设置有烟气挡板5，所述的烟气挡板的另一侧与所述的空气预热器连接，所述的烟气在循环风机的抽烟气口位于分流省煤器的出口位置。
实施例2：
根据实施例1所述的超临界CO2试验锅炉的引入烟气再循环系统，所述的锅炉水平烟道的右侧设置有一级过热器7和二级过热器8，所述的水平烟道的左侧设置有一级再热器9和二级再热器10，所述的一级过热器和所述的二级过热器连接，所述的一级再热器和所述的二级再热器连接。
实施例3：
根据实施例1或2所述的超临界CO2试验锅炉的引入烟气再循环系统，所述的分流省煤器分为过热器侧分流省煤器11和再热器侧分流省煤器12两个部分，所述的过热器侧分流省煤器设置在所述的锅炉水平烟道的右侧，所述的再热器侧分流省煤器设置在所述的锅炉水平烟道的左侧。
实施例4：
根据实施例1或2或3所述的超临界CO2试验锅炉的引入烟气再循环系统，所述的过热器侧分流省煤器和所述的再热器侧分流省煤器采用并联方式连接。
实施例5：
根据实施例1或2或3或4所述的超临界CO2试验锅炉的引入烟气再循环系统，所述的锅炉采用20MW试验锅炉，所述的空气预热器采用管式空气预热器。
Claims (6)
1.一种超临界CO2试验锅炉的引入烟气再循环系统，其组成包括：锅炉、锅炉水平烟道、空气预热器和燃气燃烧器，其特征是：所述的锅炉采用L型布置方式，且顶部设置有所述的燃气燃烧器，所述的燃气燃烧器采用炉顶下冲方式布置，所述的锅炉的一侧与所述的锅炉水平烟道连接，所述的锅炉水平烟道为双烟道结构布置，所述的锅炉水平烟道的尾部设置有烟气挡板，所述的烟气挡板的另一侧与所述的空气预热器连接，所述的烟气在循环风机的抽烟气口位于分流省煤器的出口位置，将抽出的烟气引入到所述的空气预热器出口处。
2.根据权利要求1所述的超临界CO2试验锅炉的引入烟气再循环系统，其特征是:所述的锅炉水平烟道的右侧设置有一级过热器和二级过热器，所述的水平烟道的左侧设置有一级再热器和二级再热器，所述的一级过热器和所述的二级过热器连接，所述的一级再热器和所述的二级再热器连接。
3.根据权利要求2所述的超临界CO2试验锅炉的引入烟气再循环系统，其特征是:所述的分流省煤器分为过热器侧分流省煤器和再热器侧分流省煤器两个部分，所述的过热器侧分流省煤器设置在所述的锅炉水平烟道的右侧，所述的再热器侧分流省煤器设置在所述的锅炉水平烟道的左侧。
4.根据权利要求3所述的超临界CO2试验锅炉的引入烟气再循环系统，其特征是:所述的过热器侧分流省煤器和所述的再热器侧分流省煤器采用并联方式连接。
5.根据权利要求1所述的超临界CO2试验锅炉的引入烟气再循环系统，其特征是:所述的锅炉采用20MW试验锅炉，所述的空气预热器采用管式空气预热器。
6.一种权利要求1—5之一所述的超临界CO2试验锅炉的引入烟气再循环系统及循环方法，其特征是:该方法包括如下步骤：
（1）工质流程：一部分约主流的10%经过分流省煤器加热后，在进入气冷壁进口集箱前与主流混合，混合后的工质从气冷壁进口集箱引入到垂直管圈气冷壁，从气冷壁出口集箱引出的工质依次进入两级过热器加热至额定参数600℃。
（2）风烟流程：来自送风机的冷空气，经管式空气预热器加热后，与送入炉膛的燃气混合燃烧，产生的热烟气向下在水平分隔烟道分成两路，依次经二级过热器和二级再热器、一级过热器和一级再热器及两侧的并联形式的分流省煤器，并在省煤器出口烟道汇合，再通过空气预热器离开锅炉。
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