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Ren Y.,Harbin Engineering University | Mu Z.-Y.,Beijing Gas Group Co. | Zheng H.-T.,Harbin Engineering University | Chen S.,CCS Mansion
Advanced Materials Research | Year: 2014

Energy consumption analysis models of ship energy system were established. The performance indexes, such as energy loss ratio, waste heat recovery rate and waste heat recovery perfect degree were defined. A 70000 - ton crude oil carrier was taken as an example for energy consumption analysis. The results show that the waste heat recovery rate of exhaust smoke was 15.69%, and the waste heat recovery perfect degree was 52.76%. © (2014) Trans Tech Publications, Switzerland. Source


Yang H.,Investment Center for Beijing Gas Group Co. | Zhang L.,Beijing Gas Group Co.
Natural Gas Industry | Year: 2014

Evaluation of shale gas exploration block selection involves technical, economic and market factors. However, for lack of such a scientific, easy and practical evaluation model, those relavant companies can not find any reference at their bidding phase. In view of this, the impacts of investment scale and market conditions on shale gas exploration block selection were first quantitatively analyzed based on the CRITIC method, and combined with the 6 main indexes reflecting geological conditions of shale gas resources. Thus, a comprehensive quantitative model was built, considering 12 factors including resources conditions, investment scale, gas market situation, etc., in the decision-making process. After the introduction of investment scale and market conditions into this model, a rather great change occurs in the decision-making results, meanwhile due to the quantitative analysis, this model helps make a strategic decision more scientific and objective, so with its simple and practical aspects, it becomes a best choice for those non-oil operators. In the case of the China's second round auction of exploration rights for shale gas blocks, this model provided the similar outcomes with the actual competitive bidding results, thus providing practical reference for a bidding enterprise to make a proper decision in the subsequent shale gas bidding. Source


Wang J.-P.,Beijing Institute of Technology | Wang J.-P.,Beijing Gas Group Co. | Liu Q.-M.,Beijing Institute of Technology | Wang B.,Beijing Institute of Technology | And 3 more authors.
Meitan Xuebao/Journal of the China Coal Society | Year: 2015

The lower explosion limit of dust cloud is a basic characterization of the dangers of inflammable and explosive dust. Accurately test and show the lower explosion limit is important for the assessment and prevention of dust explosion disaster. According to Logistic regression model based on statistical analysis, using the calculation method of the lower explosion limit of dust cloud which represented by probability, the experiments on the lower explosion limit of coal dust with different diameters were conducted in 20 L spherical explosion test apparatus. The test results were analyzed using statistical software (SPSS) to obtain probability distributions for ignition versus dust concentrations of coal dust with different diameters and different experimental frequency. The results show that the lower explosion limit of coal dust under different ignition probability has a tendency to decrease with reducing particle size. And the smaller the particle size, the narrower the range of concentration of ignition probability from 10% to 90%, which means the deflagrating characteristic of coal dust is becoming much more stable. The lower explosive limit probability distribution is affected by experimental frequency, the more the experiments, the narrower the range of lower explosive limit concentration. When the ignition probability is 50%, the corresponding concentration has nothing to do with the number of experiments, which is the key to the research of dust explosion experiment. Compared with other standard calculations, the viewpoint of ignition as a statistical phenomenon appears to be more consistent with the test data in engineering, can also meet the needs of different production environment for security control. ©, 2015, China Coal Society. All right reserved. Source


Ren Y.,Harbin Engineering University | Mu Z.-Y.,Beijing Gas Group Co. | Zheng H.-T.,Harbin Engineering University | Chen S.,CCS Mansion | Peng L.-J.,CCS Mansion
Applied Mechanics and Materials | Year: 2014

A new IAQ improved ventilation system- reversible ventilation system was designed. This system's working principle was introduced. For analyzing the superiority of reversible ventilation system, the conceptions of effective fresh air ratio and minimum effective fresh air ratio were described. The formula of effective fresh air ratio was deduced. The formula can be used to analyze the different air outputs of reversible ventilation system and conventional general ventilation system, in rooms with the same degree of fresh air. It can be taken as the guide for design and actual applications of reversible ventilation system. © (2014) Trans Tech Publications, Switzerland. Source


Cai W.,Ningbo University of Technology | Wang H.,Ningbo University of Technology | Chen W.,Ningbo University of Technology | Ma M.,Beijing Gas Group Co.
2012 2nd International Conference on Consumer Electronics, Communications and Networks, CECNet 2012 - Proceedings | Year: 2012

The purpose of this study is to investigate the application of variable frequency primary pump technology. The energy conservation effect and feasibility of several kinds of variable frequency circulation pump control in air conditioning system were analyzed. The results show that the temperature difference controls has the best energy conservation effect. The utilization of the control method in design needs a good balance and careful analysis according to the system size, composing of the load, and the balance of the resistance of water system. © 2012 IEEE. Source

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