The Experts below are selected from a list of 981 Experts worldwide ranked by ideXlab platform
Liu Zhaogui - One of the best experts on this subject based on the ideXlab platform.
-
discharging device of dehydrated vegetable cleaner
2014Co-Authors: Liu ZhaoguiAbstract:The utility model relates to the field of vegetable cleaning equipment, in particular to a discharging device of a dehydrated vegetable cleaner. The discharging device of the dehydrated vegetable cleaner comprises a Conveying Pipeline arranged below a discharging outlet of the dehydrated vegetable cleaner, wherein a feeding inlet and a discharging outlet are formed in the Conveying Pipeline, the discharging outlet of the dehydrated vegetable cleaner is fixedly connected with the feeding inlet of the Conveying Pipeline, rotary rollers are symmetrically arranged at the two ends of the Conveying Pipeline respectively, a conveyer belt is arranged on the rotary rollers, and a plurality of separating plates are arranged on the conveyer belt. Due to the fact that when the discharging device of the dehydrated vegetable cleaner is used, vegetables cleaned by the dehydrated vegetable cleaner are discharged through the discharging outlet, then fall to the position between every two adjacent separating plates on the conveyer belt, are conveyed through the conveyer belt, and are discharged out through the discharging outlet, Conveying efficiency is high, and damage to the vegetables cannot be caused. The discharging device of the dehydrated vegetable cleaner has the advantages of being simple in structure, reasonable in design, low in manufacturing cost and the like.
Yong Yan - One of the best experts on this subject based on the ideXlab platform.
-
Mass flow rate measurement of solids in a pneumatic Conveying Pipeline in different orientations
Measurement: Sensors, 2020Co-Authors: Faisal Abbas, Lijuan Wang, Yong YanAbstract:Abstract Extensive work has been undertaken for the mass flow rate measurement of solids in a horizontal or vertical pneumatic Conveying pipe. However, flow regime of the two-phase flow is highly influenced by different orientations of the pipe, resulting in different characteristics of sensor signals and hence large errors in mass flow rate measurement using conventional methods. This paper presents a novel technique to measure the mass flow rate of pneumatically conveyed particles in different pipe orientations. A range of low-cost sensors, including an array of electrostatic sensors, a differential-pressure transducer, and an accelerometer, are integrated to form a sensing unit. Data-driven models, based on support vector machine (SVM), are developed to take the selected features from post-processed sensor data and infer the mass flow rate of solids in different pipe orientations. The partial mutual information algorithm is applied to quantify the importance of each feature. The firefly algorithm is used to optimize the selection of useful features and tune the learning parameters in SVM models. Experimental tests were conducted on a pneumatic Conveying test rig circulating flour over the mass flow rate of solids from 3.2 g/s to 35.8 g/s in pipe orientations from 0° to 90°. Performance comparisons are made between the conventional SVM model and the optimised SVM models with the training data from horizontal orientation and different orientations, respectively. Results demonstrate that the relative error and repeatability of the measured mass flow rate of solids with the optimized SVM model are both improved to within ±12%.
-
an integrated multi channel electrostatic sensing and digital imaging system for the on line measurement of biomass coal particles in fuel injection Pipelines
Fuel, 2015Co-Authors: Xiangchen Qian, Yong Yan, Lijuan Wang, Jiaqing ShaoAbstract:The measurement of key parameters of biomass–coal particles in a pneumatic Conveying Pipeline at a power plant presents a significant challenge due to the inherent complexity of the dilute particle flow and differences in physical properties between the different kinds of fuels. This paper presents the latest development in on-line continuous measurement of mean particle velocity, concentration and particle size distribution of pulverised fuel using multi-channel electrostatic sensing and digital imaging techniques. An integrated instrumentation system has been implemented to achieve the intended measurement of pulverised fuel particles. Comprehensive tests were conducted on a 150 mm bore horizontal pipe section of a large scale test facility using pulverised coal and biomass–coal blends. The results suggest that the characteristics of the pulverized fuel flow depend on the flow velocity and biomass proportion in the mixture and, to a large extent, on the biomass properties. It is found that coal particles travel faster and carry more electrostatic charge than biomass–coal blends. As more biomass particles (up to 20% by weight) are added to the flow, the particle velocity reduces, the electrostatic charge level decreases, and the flow becomes less stable in comparison with coal flow.
-
On-line automatic detection of wood pellets in pneumatically conveyed wood dust flow
2014Co-Authors: Duo Sun, Yong Yan, Robert M. Carter, Lingjun Gao, Xiangchen QianAbstract:This paper presents a piezoelectric transducer based system for on-line automatic detection of wood pellets in wood dust flow in pneumatic Conveying Pipelines. The piezoelectric transducer senses non-intrusively the collisions between wood pellets and the pipe wall. Wavelet-based denoising is adopted to eliminate environmental noise and recover the collision events. Then the wood pellets are identified by sliding a time window through the denoised signal with a suitable threshold. Experiments were carried out on a laboratory test rig and on an industrial pneumatic Conveying Pipeline to assess the effectiveness and operability of the system.
-
I2MTC - Detecting the presence of large biomass particles in pneumatic Conveying Pipelines using an acoustic sensor
2013 IEEE International Instrumentation and Measurement Technology Conference (I2MTC), 2013Co-Authors: Duo Sun, Yong Yan, Robert M. Carter, Gerry Riley, Matthew WoodAbstract:This paper proposes a novel approach to online automatic detection of the presence of large biomass particles in a pneumatic Conveying Pipeline using an acoustic emission sensor and time-frequency analysis techniques. The acoustic sensor is used to capture the sound emitted from the collisions between biomass particles and pipe wall. Time-frequency analysis technique is used to eliminate environmental noise from the acoustic signal, extract the revealing information about the collisions, and identify the large particles. The acoustic sensor together with its signal conditioning unit is integrated into a compact enclosure, which can be easily attached to the outer face of a pneumatic Pipeline. Experimental results obtained from an industrial pneumatic conveyor demonstrate the method works well and results are promising.
-
concentration measurement of biomass coal air three phase flow by integrating electrostatic and capacitive sensors
Flow Measurement and Instrumentation, 2012Co-Authors: Juan Zhang, Jun Dong, Yong YanAbstract:This paper describes an integrated instrumentation system for the volumetric-concentration measurement of biomass/coal/air three-phase flow in a pneumatic Conveying Pipeline. The system combines electrostatic sensors with capacitive sensors and incorporates data fusion techniques. As the electrostatic sensor is more sensitive to dilute pulverized coal and the capacitive sensor is more sensitive to biomass particles, both sensor techniques are integrated for the concentration measurement of biomass and pulverized coal in biomass/coal/air three-phase flow. First, the flow regime is identified through the Hilbert marginal spectrum of the electrostatic sensor output signal. Then, under certain identified flow regimes, the dual regression analysis method is applied to work out the biomass concentration and the pulverized coal concentration. The experimental result indicates that the fiducial error of the system is less than 5%, and the resolution is about 1%.
Mark Jones - One of the best experts on this subject based on the ideXlab platform.
-
application of the principles of gas permeability and stochastic particle agitation to predict the pressure loss in slug flow pneumatic Conveying systems
Powder Technology, 2014Co-Authors: I Lecreps, Mark Jones, O Orozovic, Karl SommerAbstract:Abstract This paper focuses on the development and applicability of a single slug or total slug model that combines the concepts of gas permeability through bulk material (Ergun's model), particle agitation (kinetic theory) and gas expansion along a Conveying Pipeline (ideal gas law). Due to the independent development of those three models, a system of three equations with three unknowns can be solved to obtain the pressure loss, particle velocity and gas density along a slug. Calculations were carried out and compared with the experimental data obtained during horizontal slug flow pneumatic Conveying of plastic pellets. The effects of the most relevant physical parameters to be input in the prediction model such as slug porosity, stresses, supply air velocity and total slug length are discussed on the basis of experimental and numerical results.
-
Analysis of Wear Mechanisms in Pneumatic Conveying Pipelines of Fly Ash
Lecture Notes in Mechanical Engineering, 2013Co-Authors: A. A. Cenna, Mark Jones, Kenneth Williams, W. RobinsonAbstract:Pneumatic Conveying is a frequently used method of material transport particularly for in-plant transport over relatively short distances. This is primarily to exploit the degree of flexibility it offers in terms of Pipeline routing as well as dust minimization. Approximately 80 % of industrial systems are traditionally dilute phase system which uses relatively large amount of air to achieve high particle velocities to stay away from trouble, such as blocking the Pipeline. However, for many applications higher velocities lead to excessive levels wear of Pipelines, bends, and fittings. To combat these problems, many innovative bends have been designed. These designs have solved the problem of wear in the bends, but often introduce the wear problem in the area immediately after the bend due to the changed flow conditions. Wear in pneumatic Conveying is a very complex problem and at present there is limited understanding of the wear mechanisms responsible for the severe wear in certain areas of a pneumatic Conveying Pipeline. The ability to determine the wear mechanisms in these areas holds the key for determining the service life of pneumatic Conveying Pipelines in industry. Even though the fly can be conveyed at low velocity dense phase mode, wear of Pipeline Conveying fly ash remained a critical issue for many power plant operators. In this paper the wear mechanisms in a fly ash Conveying Pipeline has been analyzed. Wear samples from fly ash Conveying Pipeline have been collected and analyzed for dominant wear mechanisms in the critical wear areas. Analysis of the worn Pipeline showed continuous wear channels along the bottom of the Pipeline consistent with the abrasive wear by larger particles. The other severe wear areas are the sections after the special bends used to reduce bend wear. Scanning electron microscope (SEM) analysis of the surfaces revealed that both erosive wear and abrasive wear mechanisms are present in these areas. Formation of a surface layer similar to transfer film in alumina Conveying Pipelines have been recognized in this analysis. These layers seem to be removed through brittle manners such as cracking and spalling. The wear mechanisms and the wear debris seen on the surface are consistent with wear by larger particles.
-
modeling and analysis for fluidized dense phase Conveying including particle size distribution
Powder Technology, 2013Co-Authors: Niranjana Behera, Vijay K. Agarwal, Mark Jones, K C WilliamsAbstract:Abstract Pressure drop in fluidized dense phase pneumatic Conveying involves frictional interactions among gas, particle and pipe wall. There have been numerous correlations proposed by different researchers for predicting the pressure drop in fluidized dense phase Conveying. In this paper steady state flow equations have been written for different phases and these equations are solved by assuming certain factors for different Conveying materials. For writing the flow equations, a single gas phase and certain number of solids phases (which are chosen based on the particle size distribution of the Conveying material) have been considered. Experimental data have been used as initial conditions at the exit of the Pipeline in order to solve for the value of the flow parameters at the inlet of the Pipeline. Experimental data have also been used to find the maximum possible Conveying distance or maximum possible Conveying Pipeline diameter by imposing certain limiting conditions of Conveying. Scaling equations for the solids mass flow rate and the air mass flow rate have been used to predict the pressure drop for different Pipeline diameters and Pipeline lengths.
-
Experimental determination of cutting and deformation energy factors for wear prediction of pneumatic Conveying Pipeline
Engineering Asset Lifecycle Management, 2010Co-Authors: Kim Pang, A. A. Cenna, Shengming Tan, Mark JonesAbstract:Pneumatic Conveying has become a well established method of transporting materials in the resource and process industries. Erosion is a phenomenon that occurs in pneumatic Conveying Pipeline due to the inherent nature of Conveying process. In pneumatic Conveying, particulate material is transported by the motive of compressed gas with velocities usually less than 60 m/s. In the present investigation, erosion tests were performed in order to study the wear behaviour and determine specific energy factors of Pipeline material for the predictive models of wear in dense phase mode of pneumatic Conveying Pipeline. These tests were performed on mild steel and aluminum surface with alumina and Ilmenite particles. Double disc method was used to measure the particle impact velocities with different powder mass flow rates at different compressed air pressures for erosion tests. Erosion rate and erosion behaviour were studied under the influence of solid particle erosion at dense phase Conveying condition. Deformation and cutting energy factors were then determined for predicting wear based on the material removal mechanisms. These factors will then be incorporated in a generic software algorithm to predict the service life of pneumatic Conveying Pipeline.
-
Numerical simulation of some effects on pressure drop predicting in pneumatic transport
Journal of Wuhan University of Technology, 2010Co-Authors: Kenneth Williams, Jiemin Zhou, Mark JonesAbstract:The prediction of pressure drop along a pneumatic Conveying Pipeline is important for the design of air supply system.The pressure drops between certain cross-sections of a pneumatic Conveying Pipeline were predicted based on a series of experiments.A numerical study of gas-solid flow was undertaken by means of commercial CFD software Fluent.The simulation was performed by using the Euler-Euler approach.The agreement of the predictions with the experiments was found to be very good.Furthermore,the effect of some main factors on the pressure drops was investigated systematically.
Yan Zhang - One of the best experts on this subject based on the ideXlab platform.
-
characterization of electrostatic sensors for flow measurement of particulate solids in square shaped pneumatic Conveying Pipelines
Sensors and Actuators A-physical, 2008Co-Authors: Lihui Peng, Yan ZhangAbstract:Theoretical analysis of an electrostatic sensor with square-shaped electrodes for installation on a pneumatic Conveying Pipeline is reported in this paper. In comparison with ring-shaped ones, the square-shaped electrodes are more difficult to analyze because of the four sharp corners. Based on a mathematical model of the electrostatic sensor, induced charge on the electrode and hence the induced current are derived. Sensitivity distribution and frequency response of the sensor are consequently identified. Additionally, effects of the geometric dimensions and attributes of charged particles on the characteristics of the sensor are investigated. Experimental work was performed on a purpose-built particle flow test rig in order to verify the modeling results. Suggestions on the improvement of the electrostatic sensor design are also given.
Xiangchen Qian - One of the best experts on this subject based on the ideXlab platform.
-
an integrated multi channel electrostatic sensing and digital imaging system for the on line measurement of biomass coal particles in fuel injection Pipelines
Fuel, 2015Co-Authors: Xiangchen Qian, Yong Yan, Lijuan Wang, Jiaqing ShaoAbstract:The measurement of key parameters of biomass–coal particles in a pneumatic Conveying Pipeline at a power plant presents a significant challenge due to the inherent complexity of the dilute particle flow and differences in physical properties between the different kinds of fuels. This paper presents the latest development in on-line continuous measurement of mean particle velocity, concentration and particle size distribution of pulverised fuel using multi-channel electrostatic sensing and digital imaging techniques. An integrated instrumentation system has been implemented to achieve the intended measurement of pulverised fuel particles. Comprehensive tests were conducted on a 150 mm bore horizontal pipe section of a large scale test facility using pulverised coal and biomass–coal blends. The results suggest that the characteristics of the pulverized fuel flow depend on the flow velocity and biomass proportion in the mixture and, to a large extent, on the biomass properties. It is found that coal particles travel faster and carry more electrostatic charge than biomass–coal blends. As more biomass particles (up to 20% by weight) are added to the flow, the particle velocity reduces, the electrostatic charge level decreases, and the flow becomes less stable in comparison with coal flow.
-
On-line automatic detection of wood pellets in pneumatically conveyed wood dust flow
2014Co-Authors: Duo Sun, Yong Yan, Robert M. Carter, Lingjun Gao, Xiangchen QianAbstract:This paper presents a piezoelectric transducer based system for on-line automatic detection of wood pellets in wood dust flow in pneumatic Conveying Pipelines. The piezoelectric transducer senses non-intrusively the collisions between wood pellets and the pipe wall. Wavelet-based denoising is adopted to eliminate environmental noise and recover the collision events. Then the wood pellets are identified by sliding a time window through the denoised signal with a suitable threshold. Experiments were carried out on a laboratory test rig and on an industrial pneumatic Conveying Pipeline to assess the effectiveness and operability of the system.