Eventos Anais de eventos
ENCIT 2022
19th Brazilian Congress of Thermal Sciences and Engineering
Identification of transient differential pressure signal features of two-phase in different flow patterns across an orifice plate
Submission Author:
Tiago Francisconi Borges Camargo , SC
Co-Authors:
Tiago Francisconi Borges Camargo, Emilio Paladino
Presenter: Tiago Francisconi Borges Camargo
doi://10.26678/ABCM.ENCIT2022.CIT22-0259
Abstract
Phase flow rate measurement and flow pattern identification of two-phase gas-liquid flows are important to process monitoring and control in several industrial applications. The inline flow-rate measurement, i.e., without prior phase separation, is important, mainly, in applications in remote areas such as off-shore oil production. Differential pressure flowmeters represent a good alternative in these applications due to their robustness, reliability and low cost. In this work, the orifice plate is studied as a flow rate metering device which is also used to address the flow pattern identification. The temporal series of differential pressure is used to relate the flow behavior to the transient “signature” of the signal. While the mean of the differential pressure signal, can be related to the total mass flow rate, knowe a priori, the phase fractions, its transient part can be related to the individual phase flow rates or phase fractions. In addition, this signal signature can be used for flow pattern identification. and for methods of machine learning inputs. Some specific characteristics or “features” of the pressure signal as PDF, PSD, and DWT are extracted from the signal which is then used as inputs to a deep neural network used to determine phase flow rates and flow patterns. In this paper, a preliminary analysis is presented that relates the transient pressure signal and its features, to the observed flow structure The experimental procedure operates ranges of 0.03 to 0.49 m/s liquid superficial velocity and 0.03 to 15 m/s gas superficial velocity on a horizontal configuration of a 25,4 mm internal diameter. The PDF of the signal is analyzed against the superficial gas velocity and the pattern taken by photograph 20D upstream of the orifice plate, with this information is discussed how is related to the representation as a behavior signature of the two-phase flow. The PSD is then compared with gas and liquid superficial velocity and analyzed how these parameters influence the frequency distribution. Wavelet coefficients maximum and minimum are compared with the standard deviation of each point of constant liquid superficial velocity and gas superficial velocity, those coefficients are more pronounced relay on the respective frequency ranges. The PSD representation of the signal shows an increase in its highest value until the transition from slug to annular flow, beyond this region there is a scattering of power density to higher frequency values compared with the peak frequency.
Keywords
Gas-Liquid Flow, Signal Analysis, Inline two-phase flow metering, orifice plate
