公开(公告)号：US08521333B2

公开(公告)日：2013-08-27

申请号：US12386461

申请日：2009-04-17

申请人： Mark Richman ,  Michael Hoeg Nielsen ,  Ralph Joseph Lebron

发明人： Mark Richman ,  Michael Hoeg Nielsen ,  Ralph Joseph Lebron

IPC分类号： G05B13/02

CPC分类号： G05B13/021 ,  F23J15/02 ,  F23J2217/102 ,  F23J2217/40 ,  F23J2219/60

摘要： An improved method and system for flue gas recirculation (FGR) from the ID Fan located downstream of a scrubber (or other Air Quality Control Equipment including cyclones, baghouses, etc., hereafter “AQC equipment”) back to the scrubber (or other AQC Equipment) inlet to maintain the minimum required flue gas throughput during low-load conditions, thereby eliminating the need for a separate booster fan. A flue gas recirculation duct is connected from downstream of the ID Fan to the inlet of the scrubber (or other AQC Equipment). A variable flow restrictor is placed in the duct downstream of the ID Fan for controlling pressure of the recirculated flue gas. The flow restrictor is controlled in accordance to a function of boiler load or flue gas flow to produce the required backpressure that enables the flue gas to flow through the recirculation duct back to the inlet of the scrubber (or other AQC Equipment) at low loads. This side stream of treated gas is recirculated from the discharge of the ID Fan to the inlet of the AQC Equipment to maintain the appropriate gas velocity regardless of boiler load conditions. The pressure differential between fan discharge and the AQC Equipment inlet enables recirculation of a sufficient amount of treated flue gas using only a small duct and simple flow control damper, without using a booster fan.

公开(公告)号：US20090271039A1

公开(公告)日：2009-10-29

申请号：US12386461

申请日：2009-04-17

申请人： Mark Richman ,  Michael Hoeg Nielsen ,  Ralph Joseph Lebron

发明人： Mark Richman ,  Michael Hoeg Nielsen ,  Ralph Joseph Lebron

IPC分类号： G05B13/02

CPC分类号： G05B13/021 ,  F23J15/02 ,  F23J2217/102 ,  F23J2217/40 ,  F23J2219/60

摘要： An improved method and system for flue gas recirculation (FGR) from the ID Fan located downstream of a scrubber (or other Air Quality Control Equipment including cyclones, baghouses, etc., hereafter “AQC equipment”) back to the scrubber (or other AQC Equipment) inlet to maintain the minimum required flue gas throughput during low-load conditions, thereby eliminating the need for a separate booster fan. A flue gas recirculation duct is connected from downstream of the ID Fan to the inlet of the scrubber (or other AQC Equipment). A variable flow restrictor is placed in the duct downstream of the ID Fan for controlling pressure of the recirculated flue gas. The flow restrictor is controlled in accordance to a function of boiler load or flue gas flow to produce the required backpressure that enables the flue gas to flow through the recirculation duct back to the inlet of the scrubber (or other AQC Equipment) at low loads. This side stream of treated gas is recirculated from the discharge of the ID Fan to the inlet of the AQC Equipment to maintain the appropriate gas velocity regardless of boiler load conditions. The pressure differential between fan discharge and the AQC Equipment inlet enables recirculation of a sufficient amount of treated flue gas using only a small duct and simple flow control damper, without using a booster fan.

摘要翻译： 来自位于洗涤器（或其他空气质量控制设备，包括旋风分离器，袋子等，以下称为“AQC设备”）下游的ID风扇的烟道气再循环（FGR）的改进方法和系统返回到洗涤器（或其他AQC 设备）入口，以在低负载条件下保持最低所需的烟气通量，从而无需单独的增压风扇。 烟道气循环管道从ID风扇的下游连接到洗涤器（或其他AQC设备）的入口。 可变流量限制器放置在ID风扇下游的管道中，用于控制再循环烟道气的压力。 流量限制器根据锅炉负荷或烟气流量的功能进行控制，以产生所需的背压，使得废气能够在低负载下通过再循环管道回流到洗涤器（或其他AQC设备）的入口。 经过处理的气体的这种侧流从ID风扇的排放再循环到AQC设备的入口，以保持适当的气体速度，而不管锅炉负载条件如何。 风扇排放和AQC设备入口之间的压力差可以使用只有小管道和简单的流量控制阻尼器才能再循环足够量的经处理的烟道气，而不使用增压风扇。