了解最新的EN 14181流量要求

Following the revision to the Environment Agency’s MID for EN 16911-2 released at the beginning of 2024, there are a number of mandatory requirements that we need to adopt when performing QAL2 and AST testing for Volumetric Flow Rate and Velocity as per the stipulations of EN 14181.

做了多大的修改啊?

The first major change required is a highly recommended one-off ‘pre-investigation’ test for all newly installed CEMS. 对于现有的CEMS也建议这样做. The pre-investigation test aims to determine whether the installed CEMS is suitable for the profile encountered at the sampling plane at varying flow rates, and the outcome of this test dictates which type of QAL2/AST is to be performed. QAL2/AST校准的两种类型是:

1. Pre-Investigation outcome is a Pass: This allows for a Type 1 QAL2 / AST – this is a reduced test QAL2, whereby the minimum number of paired tests performed can reduce from a minimum of 15 to 9 (4 for an AST). There is no need for the operator to vary the flow profile over the course of the QAL2 or AST.
2. Pre-Investigation outcome is a Fail or has not been completed: This requires a Type 2 QAL2 / AST, 它涉及至少15对测量(AST为5对). Type 2 QAL2分为不同的测试路由, following an assessment of the flow variability during normal operation over the last calendar year.

笔记:

If the lowest 10th percentile flow is determined to be >80% of the maximum flow, then the flow profile does not need to be altered by the operator during the QAL2 tests.

If the lowest 10th percentile flow is determined to be <80% of the maximum flow, then the operator must provide their testing partner with low flow conditions so a single test can be achieved at these conditions, 在流量恢复正常之前, 作为QAL2测试的一部分.

如何进行修订后的EN 14181流量评估

In order for an assessment of the varying flow over the last calendar year to be performed, 请联系您的测试合作伙伴提交您的CEMS数据. 该数据应包括以下内容:

1. 时间和日期
2. 容积流量值(修正条件)
3. A tag or column highlights if the corresponding measurement is considered valid data (valid would be for example the plant operating normally / or is invalid due to start up or shut down / plant off or in maintenance cycle).

在收到数据后, 您的测试伙伴将删除所有无效数据, 确定您的流量与正常操作相比有多大变化, and then advise on what steps to take during your EN 14181 flow assessment.

EN 14181的决策过程 

The flow chart below demonstrates the decision process regarding EN 14181流量评估.

修订摘要和后续步骤

The recent revision to the Environment Agency’s MID for EN 16911-2, 2024年初上映, brings significant changes to QAL2 and AST testing for Volumetric Flow Rate and Velocity under EN 14181. Collaboration with testing partners to assess flow variability over the past year is essential for EN 14181 flow assessment. These revisions highlight the importance of thorough testing and data analysis for reliable emissions monitoring systems.

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