Change characteristics of pressure drop and collection efficiency of the filter separators in the gas transmission station

The typical horizontal filter separator in the gas station was taken as the subject to evaluate the collection efficiency and working status of the filter separators through their operational pressure-drops under different operating conditions and guide their field operation and replacement of their filter elements. The dust on-line detection technique and CFD simulation were adopted to analyze the static and dynamic characteristics of pressure drop and collection efficiency of filter separator under different running time and pressure. The major results were verified using actual values. The results indicate that the lower of initial pressure-drop of the filter separator, the lower of operating pressure at the same flow rate. With the increase of its operational time, a strong trend of the monitored pressure-drop values is negatively deviating their best-fitted curves, and its collection efficiencies also present a decreasing trend, especially at its lower operational pressure, due to the gas with higher flow velocity carrying more coalesced particles to the downstream and leading to the increase of downstream dust concentration at this operational condition. The errors of collection efficiencies obtained by the on-line particle monitoring technique and the CFD method are lower than 20%. The actual dust collection verified that both methods are of higher accuracy, reliability and suitable in the prediction on the evolution of the pressure drop and the collection efficiency. © 2021, Chemical Industry Press Co., Ltd. All right reserved.