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Ning Z.,Zhejiang University | Podlinski J.,Szewalski Institute of Fluid Flow Machinery | Shen X.,Zhejiang University | Li S.,Zhejiang University | And 3 more authors.
Journal of Electrostatics | Year: 2016

Wide Electrostatic Precipitator (having plate-to-plate spacing 400 mm or more) is one of a promising ways to improve existing ESPs, yet its large-scale application has been limited because of potential collection efficiency reduction. This article focus on study the electrohydrodynamic flow inside the ESP and the particle collection efficiency by using Particle Image Velocimetry and Electrical Low Pressure Impactor respectively when several different electrode geometries were applied, in order to increase wide ESP efficiency. Results showed that geometry with juxtaposed high voltage wires provided best performance of the wide ESP (both in collection efficiency and running cost) among our tests. © 2016 Elsevier B.V.

Zhang Y.,Shenhua Guoneng Energy Group Corporation Ltd | Wang N.L.,North China Electrical Power University
Applied Mechanics and Materials | Year: 2014

Energy-saving management is playing increasingly important parts in the energy conservation of thermal power generation. The economic performance indexes were decomposed and clarified to set a delicacy energy-saving management system. With the great volume of operation data, an fuzzy rough set (FRS) –based big data analytics were introduced to build the intelligent energy-saving decision-making model. Based on such energy-saving management system, the operation optimization practice was performed on a 600MW thermal power unit to determine the optimum working state under specific operation conditions. The result shows that the proposed energy-saving management can makes great guidelines for the operation optimization and energy-saving diagnosis of thermal power units. © 2014 Trans Tech Publications, Switzerland.

Huang Y.,Zhejiang University | Huang S.,Zhejiang University | Zheng Q.,Zhejiang University | Shen X.,Zhejiang University | And 4 more authors.
International Journal of Plasma Environmental Science and Technology | Year: 2015

Electrostatic precipitation (ESP) is a common technology applied in fly ash control in coal-fired power plant over the world, due to its high efficiency, low pressure loss, and low maintenance cost. Since fine particle collection (PM2.5) is much harder than relative large particle, modern ESP requires excellent performance on PM2.5 collection. In this paper, not only the ESP principles and models, but also the modern techniques developed recently for ESP in PM2.5 control will be reviewed, such as electric agglomeration, flow field visualization, modern power source, moving electrode ESP and colder-side ESP. The newly developed ESP index model and its application in ESP sizing and upgrading will be introduced in detail. Besides, several advanced flue gas cleaning systems developed in the past twenty years will be presented and compared, especially for the system with colder-side ESP developed in the recent ESP upgrading activities in China.

Shen X.-J.,Zhejiang University | Shen X.-J.,Shenyang University of Technology | Wang S.-L.,Shenhua Guoneng Energy Group Corporation Ltd | Han P.,Shenhua Guoneng Energy Group Corporation Ltd | And 3 more authors.
Zhejiang Daxue Xuebao (Gongxue Ban)/Journal of Zhejiang University (Engineering Science) | Year: 2015

In order to investigate the influence of gas flow field on fine particles precipitation of electrostatic pricipitator (ESP), submicron particle movement inside an ESP was measured by using two-dimensional Particle Image Velocimetry (2D-PIV) technique. Moxa-moxibustion smoke was used as the tracer for the experiments. The wire-plate type ESP had gap distance of 200 mm. Experiments were performed with changing the high-voltage wires or corona discharge polarities. For a single high-voltage wire ESP and at the applied voltage of 50 kV, four generated vortexes around the wire are usually observed. For the ESP with double corona wires, more vortexes are produced due to their interaction. The four vortexes become much more symmetrical in between the two corona wires. Positive or negative corona discharges give similar vortexes in terms of their shapes. They are also similar each other when using wire or spike type electrodes. The particle velocity, however, can be significantly increased when using the double spike electrode due to its larger discharge power. The observed maximum velocity is about 1.6 m/s, which is almost three times of the primary gaseous velocity. ©, 2015, Zhejiang University. All right reserved.

Zhang Y.,Shenhua Guoneng Energy Group Corporation Ltd | Fu P.,North China Electrical Power University | Wang N.L.,North China Electrical Power University
Advanced Materials Research | Year: 2014

The in-depth energy conservation of thermal power units is confronting new challenges under the varying operation conditions and ambient constraints. Compared with traditional optimal values, the description of energy-consumption benchmark state was proposed to describe the economic performance of thermal power units with the varying operation boundary, operation conditions and equipment performance. The energy consumption interactions of units were divided into 4 parts: parameters, equipment, subsystems and units. The models for energy-consumption benchmark states were established with the fuel specific consumption(FSC) setting as the optimization objective. Such a method was performed on a 600MW supercritical power unit and the results show that the energy-consumption benchmark state, which is related with the varying boundary, can reflect the boundary condition, operation lever and equipment performance. It makes significant reference for the energy-saving diagnosis and operation optimization of thermal power units under overall working conditions. © (2014) Trans Tech Publications, Switzerland.

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