Smokestack Gas Velocity Measurements using 3-D Pitot tubes in a Coal-Fired Power Plant

W. Kang, S. Im, N. D. Trang, J. Shin, Y-M Choi
The fossil carbon dioxide (CO2) emissions from the combustion of fossil fuels and energy generators prevail over total greenhouse gas (GHG) emissions. Therefore, accurately estimating GHG emissions from stationary sources such as coal-fired power plants is also one of the efforts to mitigate the global rise in emissions. The GHG volumetric flow rates in stacks are measured mostly with the S-type Pitot tubes in Korea. But the S-type Pitot tube introduces error when it is operated under the presence of non-axial flows in stacks. In contrast, the three-dimensional (3D) Pitot tubes, which can determine all three-directional velocity components of the flow, are expected to surmount the restriction of the S-type Pitot tube. In this research, the flue gas velocity in the smokestack is measured with the 3D Pitot tubes to investigate the three-dimensional velocity profile and patterns inside the smokestack. The axial and off-axial velocity components of the flue gas in the smokestack are measured with two kinds of 3D Pitot tubes which are prism and spherical 3D Pitot tubes. They are compared with the TMS velocity which is measured with the S-type Pitot tube. The axial velocity components measured by the 3D Pitot tubes are well agreed with the TMS velocities by the S-type Pitot tube, and the velocity distribution and flow patterns inside the smokestack are investigated.
Greenhouse gas emission; Continuous emission monitoring system; 3D Pitot tube; Volumetric gas flowrate measurement
Event details
Event name:

19th International Flow Measurement Conference 2022

Chongqing, CHINA
01 November 2022 - 04 November 2022