Liu Shen

Bio: Liu Shen is an academic researcher from Southeast University. The author has contributed to research in topics: Pressure drop & Phase (matter). The author has an hindex of 3, co-authored 6 publications receiving 37 citations.

Investigation on Dynamic Calibration for an Optical-Fiber Solids Concentration Probe in Gas-Solid Two-Phase Flows

Abstract: This paper presents a review and analysis of the research that has been carried out on dynamic calibration for optical-fiber solids concentration probes. An introduction to the optical-fiber solids concentration probe was given. Different calibration methods of optical-fiber solids concentration probes reported in the literature were reviewed. In addition, a reflection-type optical-fiber solids concentration probe was uniquely calibrated at nearly full range of the solids concentration from 0 to packed bed concentration. The effects of particle properties (particle size, sphericity and color) on the calibration results were comprehensively investigated. The results show that the output voltage has a tendency to increase with the decreasing particle size, and the effect of particle color on calibration result is more predominant than that of sphericity.

Design optimization of a venturi tube geometry in dense-phase pneumatic conveying of pulverized coal for entrained-flow gasification

Abstract: The use of a venturi tube to sustain the pipeline pressure in the dense-phase pneumatic conveying of pulverized coal system is promising for its application to the pressurized entrained-flow coal gasification process, in spite of the limited knowledge of the fundamentals of the gas–solid flow through the venturi tubes at high-pressure and dense-phase pneumatic transport conditions. In this paper, a series of experiments were carried out and the geometry parameters of the venturi tube, including the convergent angle, the throat diameter, the throat length and the diffuser angle were varied at constant flow conditions to evaluate their effect on the conveying properties and on the pressure reduction effects in the flow of gas–solid mixtures through the venturi tube. The optimum values or ranges of the above mentioned venturi geometrical parameters in the application of venturi tubes to dense-phase pneumatic conveying of pulverized coal are determined in this work. These values will provide a useful reference for the design of feeding systems in the pressurized entrained-flow coal gasification process.

Experimental investigation on the flowability properties of cohesive carbonaceous powders

Abstract: The flowability properties of two carbonaceous powers (anthracite coal and petroleum coke), including angle of repose (AOR), Hausner ratio (HR) and powder compressibility (C), etc., were determined. The effects of particle size, external moisture content (MC) and power type on powder flowability properties were investigated. The results indicate that as the powder particle size increases, the AOR, HR and C decrease, respectively, and the powder flowability becomes better. As the powder external MC increases, the AOR, HR and C increase, respectively, and the powder flowability becomes worse. The anthracite coal has lower values of AOR, HR and C, and higher values of flow function (FF) than those values of petroleum coke. Therefore, anthracite coal has better flowability compared to petroleum coke. Meanwhile, there exists a good linear correlation between AOR and HR.

Solid-Mass Flow-Rate Prediction in Dense-Phase Pneumatic Conveying of Pulverized Coal by a Venturi Device

Abstract: This paper aims at predicting the solid-mass flow rate of pulverized coal in dense-phase pneumatic conveying systems. A one-dimensional model was developed based on the proper modification of a dilute-flow model by inserting a two-phase flow multiplier. The relationships between the model parameters (discharge coefficient and pressure ratio parameter) and the hydrodynamic nondimensional numbers (Reynolds and Stokes numbers) were determined, and the fitting coefficients were obtained from calibration tests by using regression analysis. Two methods attached to the model were proposed to predict the solid-mass flow rate, and both can provide satisfactory predictions with acceptable errors. These results indicated the possibility of applying a venturi device to measure the solid-mass flow rate at high-pressure and dense-phase conditions.