Papers by Author: Min Du

Abstract: With the continuous development of electric power construction and electricity market reform, power grid investment are facing more and more uncertainties. As to the Key Project investment evaluation for grid, single stage evaluation model is too simple to make an appropriate decision, which overlooked the option value of the investment project. Therefore, in view of the periodical characteristics of investment decision-making process of the grid company’s key project, this article based on the real option analysis methods, and divide the power grid’s key projects into multiple stage according to time sequence, to evaluate each stage’s option value, and to determine the overall value of the grid company’s key investment projects, which has also provided an new train of thought for the assessment of risk investment projects.

Abstract: Dissymmetric bis-quaternary ammonium with imidazoline ring was evaluated for corrosion inhibition efficiency against Q235 steel in 1.0mol•L-1hydrochloric acid solution at room temperature (298K) by gravimetric method, potentiodynamic polarization, electrochemical impedance spect- rum(EIS) and quantum chemical calculation. The results of mass loss and polarization data showed the compound acted as a very good mix-up inhibitor for Q235 steel in 1.0mol•L-1hydrochloric acid solution. EIS results showed that the associated values of the charge transfer resistance (Rct) increase by increasing the additive concentrations and immersing time whereas the associated values of double layer capacitance (Cdl) decrease. These changes in the impedance parameters (Rct and Cdl) are indicative of adsorption of the compound on Q235 steel surface leading to the formation of a protective film. The obtained correlations and Quantum chemical calculations conclusions agree well with the experimental results.

Abstract: Imidazoline derivative inhibitors are successfully used in oil-gas field for CO2 and H2S corrosion. The inhibition performance and inhibition mechanism of imidazoline with thioureido to prevent corrosion of steel in saltwater saturated with CO2 were studied by polarization curves and electrochemical impedance spectroscopy (EIS), in the meantime, quantum chemical analysis was used to analysis the results. The results of electrochemical measurements indicated that the inhibitor belonged to mixed-type inhibitor which mainly inhibited anodic process and worked as “negative catalysis”. The inhibition efficiencies increased then decreased with the increase in inhibitor concentration. The electrochemical results have also been supplemented by quantum chemical analysis. It was found that the chemical adsorption of the imidazoline with thioureido molecule on Q235 steel depended on the imidazoline ring and thioureido, thus the inhibitor had good corrosion inhibition.