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A Novel Instrument for In-situ NO{sub}x Measurement Applied to SCR Units

机译:一种用于原位的新颖仪器{Sub} X测量应用于SCR单元

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A critical element in monitoring SCR operation is the performance of the catalytic bed. Diagnosing potential problems on an SCR may be facilitated by reliably monitoring NO{sub}x concentrations at the inlet as well as the outlet to the SCR unit. In addition to obtaining temporal data on NO{sub}x concentrations, having spatially resolved measurements enable location of degraded performance within the catalytic bed. In the past, inlet and outlet NO{sub}x was measured using conventional extractive continuous emissions monitoring systems (CEMS). Such systems are used for reporting regulated emissions. They are expensive to purchase. Extractive, so-called, micro-CEMS cost less than the regulatory CEMS; however, both types of CEMS require frequent maintenance. Because of these cost issues, operators are reluctant to install multiple instruments to gain spatially resolved monitoring capability. HORIBA in collaboration with the EPRI Instrumentation and Control Center have developed a low cost, low-maintenance, in-situ instrument for monitoring NO{sub}x concentrations, the INM-700. The benefits of such an instrument for the SCR application is that its low purchase price and low operating and maintenance cost free the operator to deploy multiple units at both inlets and outlets to SCRs; the in-situ nature of the measurement allows the instrument to be precisely located with none of the drawbacks of sample handling lines and time lags associated with extractive methods. The in-situ instrument measures NO{sub}x using a novel zirconium oxide detector. The solid-state sensor is installed at the end of an air cooled probe tube. The probe geometry requires little of the setup, sample conditioning, and maintenance necessary for systems employing extractive sampling, thus offering reduced initial cost and cost of ownership.
机译:监测SCR操作中的临界元件是催化床的性能。通过在入口处的{Sub} X浓度以及SCR单元的出口中可靠地监测IN {sub}浓度,可以促进SCR上的诊断潜在问题。除了在没有{Sub} X浓度上获得时间数据,具有空间分辨测量,使得能够在催化床内降低性能的位置。在过去,使用常规的提取连续排放监测系统(CEM)测量入口和出口NO {SUB} x。这些系统用于报告规范的排放。他们购买昂贵。提取,所谓的微型CEMS成本低于监管CEMS;但是,两种类型的CEM都需要频繁维护。由于这些成本问题,运营商不愿意安装多种仪器以获得空间解决的监控能力。 Horiba与EPRI仪器和控制中心合作开发了低成本,低维护,原位仪器,用于监测NO {Sub} X浓度,INM-700。这种用于SCR应用的仪器的好处是,它的低购买价格和低运营和维护均可释放运营商将多个单位部署到SCR的inlet和插座上;测量的原位性质允许仪器精确地定位样品处理线的缺点和与提取方法相关的时间滞后。原位仪器使用新型氧化锆检测器测量否{sub} x。固态传感器安装在空气冷却探针管的末端。探头几何形状不需要采用提取采样的系统所需的设置,样品调节和维护,从而提高了降低的初始成本和所有权成本。

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