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This paper proposes a Tension Cable-Membrane Concentrator with an ultra-lightweight, practical and low cost alternative construction which is used in the optical-electrical conversion system. The relationship between the varied count triangular facets of the membrane surface and the focal spot radius are studied. Based on Monte Carol ray-tracing method, the optical performances of the concentrator, such as the concentrate ratio, flux distributions and focal spot radiuses etc., are analyzed in different geometry design parameters. Further, a 15 m aperture Tension Cable-Membrane Concentrator is designed, and the form-finding design is studied and verified by ANSYS®. The optical performance comparisons with the original and pre-stressed shape of the reflective film are discussed. Simulation results exhibit that the surface density of the proposed Tension Cable-Membrane Concentrator is only 5% of that of traditional rigid concentrator. It takes on the ultra-lightweight and low-cost that excite designers. The optical performance comparisons show that the peak flux distribution after form-finding over a 0.25 m receiver approximately deliver up to 800 kW/m2 corresponding to the peak concentrate ratio exceeds 1000 suns which are even better than the traditional steel design and completely satisfy design requirements.

At the same time as the rapid growth of the global economy, excessive production has led to serious pollution of water sources and the environment, endangering health and sustainable development of the environment. Realizing the informatization of environmental supervision and the intelligent supervision of pollution sources has become an urgent environmental challenge. In this study, in order to solve the problem of intelligent supervision of pollution sources, an energy-saving and environmentally friendly multi-objective load scheduling method was designed by using multi-objective load dispatching, incorporating environmental factors into power system operation to reduce pollution emissions. The main pollution sources were detected and analyzed. The demand analysis of pollution source online monitoring system was carried out from the perspective of software engineering. According to B/S architecture, the system was divided into corresponding functional modules with the idea of modularization. The system architecture encompassed data collection, transmission, alarm systems, data processing, and centralized control. This integrated approach aided in achieving sustainability in power system operations and environmental protection, offering an effective solution for online monitoring and pollution source management. The results showed that the power system dispatching administrator could view the historical alarm information through the alarm statistics and analysis function and carry out alarm statistics according to different needs. This study provided effective help for the analysis of power system business flow, network operation, and equipment performance. [ABSTRACT FROM AUTHOR]

This paper proposes a technical route for the cementation of desulfurization wastewater in power plants after concentration with flue gas. The concentrated desulfurization wastewater is mixed with cement, fly ash and other materials to obtain a solidified body. The effects of different chlorine ion concentrations, high concentration brine water with different pH and coating treatment on the performance of the solidified body were explored. The results showed that the chemical bonding and physical adsorption of chlorine ions in the cement system could greatly improve the compressive strength of the solidified body. When the chlorine ion concentration was 70,000 mg/L, the compressive strength of the solidified body was the largest and the leaching rate of chlorine ion in the solidified body was below 16%; When the pH was 4, the compressive strength and chlorine ion leaching rate of the solidified body were the best. In the practical application, Ca(OH)2 is added to the concentrated wastewater, and the pH is adjusted to 4.0–5.0; adding an epoxy resin coating on the surface of the solidified body greatly reduced the leaching rate of chlorine ion in the solidified body to less than 1%, but the disadvantage is that is decreased the compressive strength of the solidified body. [ABSTRACT FROM AUTHOR]

After the promulgation of the “water pollution control action plan” in China, zero liquid discharge (ZLD) of flue gas desulfurization (FGD) wastewater has become a hot spot for electric power conservation. In this paper, key factors affecting spray evaporation and optimum conditions were studied through laboratory experiments and industrial applications. The research results show that small atomized particle size, high flue gas flow rate, and high flue gas temperature were conducive to the complete evaporation, The optimum parameters through our lab test are listed as, flue gas temperature 300°C, the liquid flow rate 150 ml/min, the compressed air flow rate 15 L/min and the flue gas flow rate 300 m³/h; What’s more, industrial test was conducted in one specific power plant, the system can be safely run and the complete evaporation can be realized. The bypass flue has no adverse effects on subsequent equipment. This paper provides an optimized scheme for the FGD wastewater ZLD process and data to support achieving the FGD wastewater complete evaporation. [ABSTRACT FROM AUTHOR]

At present, the desulfurization wastewater produced from flue gas desulfurization (FGD) has complex compositions, discharging of FGD wastewater results not only consumption of large quantities of water resources but also destruction of the environment. With the implementation of "The Action Plan for Prevention and Treatment of Water Pollution" in China, the discharging requirements for FGD wastewater from coal-fired power plants are increasingly stringent. Besides, the traditional chemical precipitation method can no longer meet the needs of the current "zero discharge" policy. Thus, advanced treatment of desulphurization wastewater has become an inevitable trend. It is necessary to analyze the existing advanced treatment technologies for desulfurization wastewater and find out the difficulties and problems existing in these technologies. Then, the rationalizations of these technologies will be proposed, and improvable system will be designed as well as the goal of "zero discharge" achieved gradually. This paper will discuss the characteristics of desulphurization wastewater and introduce the current status of existing wastewater treatment techniques by comparing their advantages and disadvantages. In the end, combined with technologic development and the analytic results above, a new concept of "thermal membrane hybrid method" is being proposed. [ABSTRACT FROM AUTHOR]