Aiming at monitoring contaminated oil samples of marine engines, the FT-IR spectroscopy is used to analysis the oil samples. Under the condition of laboratory, 18 oil samples with different concentrations and different types of contaminants were measured. The types of contaminants were water, fuel dilution, ethylene glycol and oxidation. The FT-IR spectral data of oil samples is obtained. Firstly, the original FT-IR spectral data are pre-processed by the baseline correction and the data normalization. Then, the dimensions of FT-IR spectral data pre-processed are reduced by the principal component analysis (PCA) and the four different kinds of contaminant oil samples are shown by figures. Lastly, the low dimensional data are clustered by the self-organizing feature map network and the clustered results which stand for different kinds of contaminant oil samples are demonstrated in the digital form. The results showed that the accuracy of oxidation samples clustering reached 100%, the accuracy of contaminant water samples clustering reached 83%, and the accuracy of fuel or ethylene glycol contaminant samples clustering were unsatisfactory.

Gas suspension calciner is a kind of ideal fluidization process equipment for energy economy. In order to improve the effective of gas suspension calciner, a series of effecting factors such as producer gas component, air-fuel ratio, products moisture and heat dissipation on calciner energy consumption were discussed in this paper, which is based on the research of thermal balance calculation of gas suspension calciner. The study of thermal balance calculation has significant meaning on the energy-saving and the whole refinery energy consumption.

As the construction of the Energy Internet has launched into a novel method, the dependence on energy and information networks has been greatly increased. The interaction of energy and information flow has become recurring, and the deep coupling of energy and information flow has been realized. As a result, security risk factors have increased substantially. Given that, this article from the perspective of energy and information flow, combined with the "Source-Grid-Load-Storage" coordination scenario of the energy Internet and the actual development needs of the information network, this article proposes a risk assessment for many security risks that threatens the stable construction of the energy Internet Index system and corresponding index analysis.

The arc characteristic analysis of C 4 F 7 N/CO 2 , CO 2 and SF 6 gases with volume fraction of 10%C 4 F 7 N-90% under DC condition is studied. Firstly, based on the internal physical process of arc, a two-dimensional axisymmetric arc model of C 4 F 7 N/CO 2 , CO 2 and SF 6 gas was established and calculated. The arc temperature distribution and dynamic characteristics of three gas media are compared and analyzed the results show that the temperature distribution of C 4 F 7 N/CO 2 mixed gas is more similar to that of SF6 gas arc, and its radial cooling speed is faster, indicating that compared with CO 2 gas, C 4 F 7 N/CO 2 mixed gas has better arc-quenching characteristics, which can be used in the study of SF 6 substitute gas.

With more and more renewable energy connected to the power system, the power system gradually presents the characteristics of low inertia and the risk of frequency instability gradually becomes prominent. Therefore, nadir frequency has become one of the limiting factors of renewable energy carrying capacity. In this paper, firstly, based on the swing equation, frequency dynamic response after power loss was analysed. Secondly, quantitative analysis on system inertia time with renewable resources was carried out, with higher penetration rate k and the replacement rate a, the inertia time is relative lower. Thirdly, fast estimation method of renewable energy carrying capacity of power grid based on nadir frequency constraint was proposed. Finally, taking a regional power grid as an example, the effectiveness of the proposed estimation method is verified.

The application of digital management of power transmission project based on BIM technology is introduced in this paper. In recent years, the vigorous development of China's power grid, especially the comprehensive construction of UHV power transmission and transformation projects, has provided strong support for China's power grid construction. With engineering and technical personnel's gradual dependence on digital information, a 3-D digital management system based on BIM technology has been progressively implemented. It has become an inevitable trend to establish a 3-D digital and integrated platform based on BIM technology to assist owners and operators to jointly manage power transmission and transformation projects. With the wide application of power transmission and transformation entity structure BIM models in the design, construction, procurement, management and operation phases, the advantages of BIM technology in visualization, coordination, simulation and integration continue to emerge in its effective circumventing the risks and hidden dangers of power projects. Thus, BIM technology has gradually become a new channel for enterprises to earn profits and win greater economic benefits and market competitiveness.