公开(公告)号：US5960723A

公开(公告)日：1999-10-05

申请号：US15836

申请日：1998-01-29

申请人： Scott A. Vierstra ,  John J. Letcavits

发明人： Scott A. Vierstra ,  John J. Letcavits

IPC分类号： F23C7/00 ,  F23K3/02 ,  F23M9/02 ,  F23J15/00 ,  F23B5/02

CPC分类号： F23K3/02 ,  F23C7/00 ,  F23M9/02 ,  F23C2201/20 ,  F23D2205/00 ,  F23K2201/103 ,  F23K2900/01041

摘要： A method and apparatus retrofitted to a multiple-intertube pulverized-coal burner to reduce NO.sub.x emissions of roof fired boilers. An internal two stage process controls the amount of secondary air which flows to the burner. The first stage includes a secondary air damper and air flow station to regulate the amount of air which flows into a windbox of the burner. A baffle plate assembly which includes a plurality of baffle plates further limits the amount of air which flows to the core of the burner for combustion of the fuel. The baffle plates create a pressure drop within the windbox which forces or diverts a quantity of air to the periphery of the burner. The second stage includes an outlet formed in the hot primary air duct, an air plenum which communicates therewith, and a plurality of interjectory air ports which correspond with the burners in number and position along a front wall of the boiler and which communicate with the air plenum. The interjectory air ports inject interjectory air into a combustion chamber of the boiler at a substantially 90 degree angle to the direction of a plurality of burner tips of each burner and supplies the balance of the required theoretical combustion air needed to complete combustion of the fuel. A plurality of probes measure the amount of primary air, secondary air and interjectory air and signal a command loop circuit to adjust the secondary air dampers and interjectory air ports accordingly.

摘要翻译： 改造为多管间粉煤燃烧器以减少屋顶燃烧锅炉的NOx排放的方法和装置。 内部两级过程控制流入燃烧器的二次空气量。 第一级包括二次空气阻尼器和空气流动站，以调节流入燃烧器的风箱中的空气量。 包括多个挡板的挡板组件进一步限制了流入燃烧器芯的空气量，用于燃烧燃料。 挡板在风箱内形成一个压力降，它将一定数量的空气推到燃烧器的外围。 第二级包括形成在热的主空气管道中的出口，与其连通的空气通风室，以及沿着锅炉前壁的数量和位置对应的燃烧器的多个相互连接的空气端口，并与空气连通 全会。 间隔空气端口将空间空气以与每个燃烧器的多个燃烧器尖端的方向成大致90度角的方式喷射到锅炉的燃烧室中，并提供燃料完全燃烧所需的理论燃烧空气的平衡。 多个探头测量一次空气，二次空气和空中空气的量，并且发出一个命令循环电路，以相应地调节二次空气阻尼器和插入空气端口。

公开(公告)号：US06155183A

公开(公告)日：2000-12-05

申请号：US358301

申请日：1999-07-21

申请人： Scott A. Vierstra ,  John J. Letcavits

发明人： Scott A. Vierstra ,  John J. Letcavits

IPC分类号： F23C7/00 ,  F23K3/02 ,  F23M9/02 ,  F23B5/02 ,  F23B7/00 ,  F23N5/18

CPC分类号： F23K3/02 ,  F23C7/00 ,  F23M9/02 ,  F23C2201/20 ,  F23D2205/00 ,  F23K2201/103 ,  F23K2900/01041

摘要： A method and apparatus retrofitted to a multiple-intertube pulverized-coal burner to reduce NO.sub.x emissions of roof fired boilers. An internal two stage process controls the amount of secondary air which flows to the burner. The first stage includes a secondary air damper and air flow station to regulate the amount of air which flows into a windbox of the burner. The second stage includes an outlet formed in the hot primary air duct, an air plenum which communicates therewith, and a plurality of interjectory air ports which correspond with the burners in number and position along a front wall of the boiler and which communicate with the air plenum. The interjectory air ports inject interjectory air into a combustion chamber of the boiler at a substantially 90 degree angle to the direction of a plurality of burner tips of each burner and supplies the balance of the required theoretical combustion air needed to complete combustion of the fuel. A plurality of probes measure the amount of primary air, secondary air and interjectory air and signal a command loop circuit to adjust the secondary air dampers and interjectory air ports accordingly. The burner tips extend into the central core of each windbox and mixes with the incoming secondary air to provide for the fuel rich mixture.

摘要翻译： 改造为多管间粉煤燃烧器以减少屋顶燃烧锅炉的NOx排放的方法和装置。 内部两级过程控制流入燃烧器的二次空气量。 第一级包括二次空气阻尼器和空气流动站，以调节流入燃烧器的风箱中的空气量。 第二级包括形成在热的主空气管道中的出口，与其连通的空气通风室，以及沿着锅炉前壁的数量和位置对应的燃烧器的多个相互连接的空气端口，并与空气连通 全会。 间隔空气端口将空间空气以与每个燃烧器的多个燃烧器尖端的方向成大致90度角的方式喷射到锅炉的燃烧室中，并提供燃料完全燃烧所需的理论燃烧空气的平衡。 多个探头测量一次空气，二次空气和空中空气的量，并且发出一个命令循环电路，以相应地调节二次空气阻尼器和插入空气端口。 燃烧器尖端延伸到每个风箱的中心芯中，并与进入的二次空气混合以提供富燃料混合物。

公开(公告)号：US5771823A

公开(公告)日：1998-06-30

申请号：US594855

申请日：1996-01-31

申请人： Scott A. Vierstra ,  John J. Letcavits

发明人： Scott A. Vierstra ,  John J. Letcavits

IPC分类号： F23C7/00 ,  F23K3/02 ,  F23M9/02 ,  F23D1/00 ,  F23J3/00

CPC分类号： F23K3/02 ,  F23C7/00 ,  F23M9/02 ,  F23C2201/20 ,  F23D2205/00 ,  F23K2201/103 ,  F23K2900/01041

摘要： A method and apparatus retrofitted to a multiple-intertube pulverized-coal burner to reduce NO.sub.x emissions of roof fired boilers. An internal two stage process controls the amount of secondary air which flows to the burner. The first stage includes a secondary air damper and air flow station to regulate the amount of air which flows into a windbox of the burner. A baffle plate assembly which includes a plurality of baffle plates further limits the amount of air which flows to the core of the burner for combustion of the fuel. The baffle plates create a pressure drop within the windbox which forces or diverts a quantity of air to the periphery of the burner. The second stage includes an outlet formed in the hot primary air duct, an air plenum which communicates therewith, and a plurality of interjectory air ports which correspond with the burners in number and position along a front wall of the boiler and which communicate with the air plenum. The interjectory air ports inject interjectory air into a combustion chamber of the boiler at a substantially 90 degree angle to the direction of a plurality of burner tips of each burner and supplies the balance of the required theoretical combustion air needed to complete combustion of the fuel. A plurality of probes measure the amount of primary air, secondary air and interjectory air and signal a command loop circuit to adjust the secondary air dampers and interjectory air ports accordingly.

摘要翻译： 改造为多管间粉煤燃烧器以减少屋顶燃烧锅炉的NOx排放的方法和装置。 内部两级过程控制流入燃烧器的二次空气量。 第一级包括二次空气阻尼器和空气流动站，以调节流入燃烧器的风箱中的空气量。 包括多个挡板的挡板组件进一步限制了流入燃烧器芯的空气量，用于燃烧燃料。 挡板在风箱内形成一个压力降，它将一定数量的空气推到燃烧器的外围。 第二级包括形成在热的主空气管道中的出口，与其连通的空气通风室，以及沿着锅炉前壁的数量和位置对应的燃烧器的多个相互连接的空气端口，并与空气连通 全会。 间隔空气端口将空间空气以与每个燃烧器的多个燃烧器尖端的方向成大致90度角的方式喷射到锅炉的燃烧室中，并提供燃料完全燃烧所需的理论燃烧空气的平衡。 多个探头测量一次空气，二次空气和空中空气的量，并且发出一个命令循环电路，以相应地调节二次空气阻尼器和插入空气端口。