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Title: Design And Capabilities Of Nists S Cale-Model Smokestack Simulator Smss(
Author: Aaron N. Johnson Joey T. Boyd Eric Harman Mark Khalil Jacob R. Ricker Chris J. Crowley John D. Wright Rodney A. Bryant Iosif Shinder
Source: 2015 International Symposium on Fluid Flow Measurement
Year Published: 2015
Abstract: The amount of CO 2 emitted from a coal-fired power plant (CFPP) is measured by continuous emissions monitoring systems (CEMS) permanently installed in the exhaust smokestack. Both the CO 2 concentration and the bulk flow are cont inuously measured by CEMS, and the product of these measurements gives the CO 2 flux. The EPA requires CEMS to be calibrated yearly using a test procedure called a relative accuracy test audit (RATA). This calibration procedure links the concentration measurement to the SI through reference gas standards. However, establishing flow traceability is more difficult because the CE MS flow meter and the flow meter used to perform the RATA can be adversely affected by the complex velocity fields (i.e., swirling flow with a skewed velocity profile) prevalent in smokestacks. As a result the RATA only provides relative accuracy instead of flow traceability to a primary standard. In order to quantify the uncertainty of smokestack flow measurements, and to establish a calibration platform with documented tracea- bility to the derived SI unit of flow, NIST constructed a 1/10 th scale model smokestack simulator (SMSS). The test section of the SMSS will have the same velocity range and similar flow distor- tions found in to a typical CFPP smokestack.

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