EXHAUST GAS TREATMENT DEVICE FOR AN OXYGEN COMBUSTION SYSTEM
    2.
    发明申请
    EXHAUST GAS TREATMENT DEVICE FOR AN OXYGEN COMBUSTION SYSTEM 失效
    用于氧气燃烧系统的排气处理装置

    公开(公告)号:US20120272626A1

    公开(公告)日:2012-11-01

    申请号:US13509693

    申请日:2010-11-19

    IPC分类号: B01D50/00

    摘要: In an exhaust gas treatment device provided with: an exhaust gas treatment unit in which an oxygen combustion boiler 1 using coal as fuel, a denitration device 3, an air preheater 4, a dust-collection device 5, a desulfurization device 6, and a carbon dioxide recovery device 8 are sequentially arranged from the upstream side to the downstream side of an exhaust gas duct; and an exhaust gas circulation unit which branches off from the exhaust gas duct at an outlet of the dust-collection device 5 or an outlet of the desulfurization device 6 and through which the exhaust gas is preheated by the air preheater 4 and returned to the oxygen combustion boiler 1, a heat-recovery heat exchanger 13 that adjusts a gas temperature at an inlet of the dust-collection device 5 to be not greater than an acid dew point of SO3 and not lower than a water dew point is provided between the air preheater 4 and the dust-collection device 5, a reheating heat exchanger 13 that adjusts a gas temperature to be not lower than the acid dew point of SO3 is provided in the vicinity of a branch of the exhaust gas circulation unit, adjusting the gas temperature at the inlet of the dust-collection device 4 to be not greater than the acid dew point of SO3 makes it possible to prevent corrosion of pipes in the exhaust gas circulation unit and to avoid a decrease in fluidity or combustibility of the pulverized coal in the pipes in the mill.

    摘要翻译: 在具有:利用煤作为燃料的氧气燃烧锅炉1,脱硝装置3,空气预热器4,集尘装置5,脱硫装置6以及脱硫装置6的废气处理装置的排气处理装置中, 二氧化碳回收装置8从废气导管的上游侧向下游侧依次配置; 以及废气循环单元,其在集尘装置5的出口或脱硫装置6的出口处从废气导管分支,并且废气通过空气预热器4预热并返回到氧气 燃烧锅炉1,将在尘埃捕集装置5的入口处的气体温度调节为不大于SO3的酸露点且不低于露点的热回收热交换器13设置在空气 预热器4和集尘装置5,在废气循环装置的分支附近设置有调节不低于SO3的酸露点的气体温度的再热交换器13,调整气体温度 在集尘装置4的入口处不大于SO3的酸露点使得可以防止废气循环装置中管道的腐蚀并避免流动性或可燃性的降低 在磨机管道中的粉煤。