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Jin Y.,Zhejiang University | Zheng X.,Zhejiang University | Chu X.,Yantai Longyuan Power Technology Co. | Chi Y.,Zhejiang University | And 2 more authors.
Industrial and Engineering Chemistry Research | Year: 2012

Oil sludge from an oil storage tank was treated using a combined ultrasound and thermochemical cleaning method. The effects of cleaning temperature, cleaning time, ultrasound frequency, ultrasound power, and other factors on the oil recovery were investigated. Experiments on the screening and remixing of reagents were conducted and indicated that the best constituents of detergent solution were sodium silicate, sodium dodecyl benzene sulfonate, and fatty alcohol ethoxylates in a ratio of 1:1:1. The optimum conditions of the combined treatment system were also determined. The results showed that, under the optimum conditions, the oil content of oil sludge dropped from 43.13% to 1.01%, 0.53% of solids remained in the separated oil layer, and 99.32% oil recovery could be achieved when the concentration of detergent solution was to 2 g/L. Compared with traditional thermochemical cleaning, the oil recovery was 17.65% higher for the combined treatment system. © 2012 American Chemical Society. Source

Lin Y.,Shandong Business Institute | Bai Y.,Yantai Longyuan Power Technology Co.
Jixie Qiangdu/Journal of Mechanical Strength | Year: 2015

The dynamic responses of the beam under the function of the moving loads are very important practical problem in the strength and stiffness designs and the strength and stiffness checks. The measuring technology of the sensors is no doubt one of the ripe methods in the detections of the structural stresses, The reasonable designs of the electrical measuring sensors are often based on the theoretical analyses, but the theoretical solution of this kinds of problems are often hard to be given. In this paper, the definite mathematical model was proposed before hand; and the model can be divided into two sub-problems considering of the linearity of the problem, then the method of separation of variables and the inherent function method were used to give the theoretical solutions respectively, an numerical example were introduced to give the deflection responses and the stress responses of the simply-supported beam and the dynamic responses of the capacitor of the sensor in order to illustrate the important effects of the dynamic effects. This method can be extended to study the dynamic responses of the beam with an elastic system moving on it., the given theoretical conclusions have some references to the designs of new electrical sensors. ©, 2015, Journal of Mechanical Strength. All right reserved. Source

Zou G.,Shandong University | Wang X.,Yantai Longyuan Power Technology Co. | Gao H.,Shandong University | Yun B.,Xian Xirui Protection and Control Co.
Dianli Zidonghua Shebei/Electric Power Automation Equipment | Year: 2010

A busbar protection scheme with distributed calculation and local control is proposed for digital substation based on IEC61850. Its overall configuration without master station is constructed according to the technical characteristics of digital substation. The data transmission characteristics of samples and GOOSE are analyzed and the process bus which connects the devices of process layer and the protection equipment of bay layer is designed based on Ethernet technology. The principle of instantaneous current differential protection is applied in the calculation of distributed busbar protection, which takes the advantage of unsaturated current transducer. Analysis shows that the proposed scheme has simple structure, high reliability and feasibility. Source

Xing H.-Y.,China Electric Power Research Institute | Yuan H.-C.,Yantai Longyuan Power Technology Co. | Deng C.,China Electric Power Research Institute | Bai K.,China Electric Power Research Institute | And 2 more authors.
Dianli Xitong Baohu yu Kongzhi/Power System Protection and Control | Year: 2011

After analyzing the single phase grounding fault's equivalent circuit of underground power cable system, this paper proposes a new algorithm of power cable fault location based on the sequence network transformation and distributed parameters. This algorithm considers the influence of mutual inductance between core and sheath, and the mutual inductance among three-phase cables, transforms the matrix of high rank three-phase fault system into three individual sequence network matrix. It sets up the boundary conditions of the sequence network equation and phase network equation from sending end, fault point and receiving end, uses the voltage, current and other parameters of sending end, and finally gets the position of fault point by using Newton-Raphson iterative method. The algorithm is tested by using PSCAD/EMTDC simulation software, which shows high precision under different short circuit impedances. Source

Yantai Longyuan Power Technology Co. | Date: 2013-01-15

The present invention relates to a pulverized coal fired boiler with wall-attachment secondary air and grid overfire air. Primary burners including primary air spouts, secondary air spouts and close coupled overfire air spouts arranged at intervals along the height direction of a hearth are arranged on four corners of the hearth. Two-way wall-attachment secondary air spouts and one-way wall-attachment secondary air spouts are arranged from bottom to top in a primary combustion zone where the primary burners are located. One-way wall-attachment secondary air spouts are arranged in a reduction zone between the primary burners and the top overfire air spouts, and grid overfire air spouts are arranged in a burnout zone where the overfire air is supplied. By adopting the pulverized coal fired boiler with wall-attachment secondary air and grid overfire air according to the present invention, the NO amount generated in the hearth is reduced, the NO reduction rate along a flame is improved, the coke burnout rate is improved, less coke which is not burnt out enters into the burnout zone, slagging on the water-cooled wall is reduced, and ultralow emission of NOx may be realized on the premise that the combustion efficiency is not reduced, slag is not agglomerated in the hearth and the flue gas temperature deviation is small.

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