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Sampling Challenges for High Level Inlets

机译:高水平进样口的采样挑战

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摘要

Most EPA methods are designed to measure low level emissions at the outlet of incinerators and furnaces. In instances where the inlet concentration is required the methods must be modified to collect representative samples. An example is the determination of hydrogen chloride and chlorine removal efficiency. EPA Method 26A works well at the combustor outlet where low concentrations are expected, but may not be easily applied at the inlet where high concentrations may be present. Often it is necessary to use higher concentration reagents (1 normal instead of 0.1 normal) and to add more impingers to collect the samples. It may also be necessary to collect a smaller gas volume. Samplers should also be aware that the high level streams may present safety hazards that require special protective equipment. Several case studies will be presented to illustrate the sampling challenges.
机译:大多数EPA方法旨在测量焚烧炉和熔炉出口处的低水平排放。在需要入口浓度的情况下,必须修改方法以收集代表性样品。一个例子是确定氯化氢和氯的去除效率。 EPA方法26A在预期浓度低的燃烧室出口处效果很好,但在浓度较高的入口处可能不容易应用。通常需要使用更高浓度的试剂(1标准液代替0.1标准液),并添加更多的撞击器来收集样品。可能还需要收集较小的气体量。采样器还应注意,高液位流可能存在安全隐患,需要特殊的防护设备。将提供一些案例研究来说明抽样挑战。

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