The main purpose of the electro-osmosis method in engineering is to reinforce the foundation. The electro-osmosis method has a lot of research on the foundation reinforcement. The most application is the experiment of electro-osmotic combined loading. The experiment on treatment of heavy metals in municipal sludge by electro-osmotic method is still in a blank state. In this paper, the changes of basic physical properties of sludge before and after electro-osmosis and the changes of heavy metals in sludge before and after electro-osmosis were analyzed. The feasibility of electro-osmotic treatment of heavy metals in sludge was verified by comparing the content of heavy metals in the sludge with the standard value of soil environmental quality after electro-osmotic treatment.
Abstract Due to the nature of fluctuation and intermittency, the increasing penetration of wind and solar power will bring a huge impact to the power grid management. Therefore the concept of liquid air energy storage system was proposed. Compared to compressed air energy storage, liquid air energy storage has a larger storage capacity and no geographic constraints owing to the high density of liquid air. In order to obtain the optimum system design, two different liquid air energy storage systems with LNG cold energy recovery were studied. For one system, the LNG cold energy was used to precool the compressor inlet air to decrease the compression work. For another one, the LNG cold energy was applied to supplement the cold energy needed to liquefy the air and realize the decoupling between the energy storage and release processes. Thermodynamic analysis based on steady-state mathematical model was employed to evaluate the system performance difference.
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Abstract As a large-scale energy storage technology, liquid air energy storage (LAES) can effectively improve the stability and quality of power grid. However, the traditional LAES has low cycle efficiency, high initial investment and low economic benefits. In order to improve the system performance, a LAES system based on off-peak electric heat storage and high temperature preheating of turbine inlet air was proposed. The thermodynamic characteristics of the LAES system were analyzed, and the energy analysis, exergy analysis and economic evaluation were carried out. Combined with off-peak electric heat storage, the power generation during the peak time by the LAES system can be significantly increased, and the economy of the LAES system can be effectively improved with the peak-valley electricity price difference, especially in areas where the price difference is obvious. The results will be beneficial for the application and promotion of the LAES technology.
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