Title |
Multi Point Water Quenched Prove for Spatially Averaged Hot Gas Sampling in Industrial Combustors |
Creator |
Ochs, B.A. |
Contributor |
Ballance, H.C., Sun, W. |
Date |
2015-09-11 |
Spatial Coverage |
Salt Lake City, Utah |
Subject |
2015 AFRC Industrial Combustion Symposium |
Description |
Paper from the AFRC 2015 conference titled Multi Point Water Quenched Prove for Spatially Averaged Hot Gas Sampling in Industrial Combustors |
Abstract |
Extracting gas samples through intrusive probes remains the most common and simple means of gas com-; position analysis. After extraction, the probe delivers the gas sample to an online or oine gas analysis; unit; these devices operate on many dierent principles but ultimately measure the composition of the gas; at the sampling unit. This procedure works well when the measured species are homogeneous in space and; when the gas temperature is low enough to freeze any chemical reactions prior to extraction. In industrial; combustors, these conditions are typically only met when the sample is taken from the exhaust stream;; where heat exchangers and other devices mix the gas and remove heat prior to sampling. When these; conditions are not met, such as when sampling from an industrial heater or gas turbine transition piece,; special design considerations are needed to ensure reliability in the measurement. In particular, the probe; must be able to quench reactions in situ to avoid subsequent oxidation and spatially average the sample.; This paper describes the design procedure for a new multi point gas sampling probe that incorporates these; considerations. A chemical kinetics analysis was performed to nd the required cooling rate to quench the; chemical reactions. With the required quenching rate known, a one-dimensional single-point probe was; designed using a heat transfer model that delivered the required cooling rate. Next, a series of these single; point probes were combined in a sample rake designed to spatially average the gas sample. The rake's; quenching rate was validated with a two-dimensional heat transfer model using ANSYS. The new multi; point probe is shown to have sucient spatial averaging and quenching rate characteristics suggesting that; it is an appropriate design for species measurement within typical industrial combustors. |
Type |
Event |
Format |
application/pdf |
Rights |
No copyright issues exist |
ARK |
ark:/87278/s6j433jd |
Setname |
uu_afrc |
ID |
1387833 |
Reference URL |
https://collections.lib.utah.edu/ark:/87278/s6j433jd |