Abstract
In order to analyze the operation rule of steam ejector used in sewage treatment field, this paper established the mathematical model of steam ejector, simulated the internal flow state, analyzed the influence rule of external parameters on the performance of steam ejector, and analyzed the influence rule of ejector position on the water production ratio of steam ejector multi-effect evaporation desalination system. The research results show that under the same steam ejector structure, as the pressure of the working steam increases, the mixing and disturbance of the working steam and the ejected steam become more intense, and the diamond shock wave structure increases. As the pressure of the ejected steam increases, the momentum exchange effect of the shear blending of working steam and ejected steam is accelerated, and the speed increase rate becomes larger, and the diamond shock wave structure gradually gathers toward the nozzle. As the pressure rise of the ejected steam inlet and outlet increases, the backflow phenomenon near the wall in the mixing chamber becomes more serious, and the diamond shock wave structure is reduced. With the forward movement of the ejector position of the thermal steam compressor, the pressure of the ejected steam increases, and the water production ratio of the steam ejector multi-effect evaporation seawater desalination system shows a downward trend. Therefore, choosing appropriate working condition parameters can effectively improve the working performance of steam ejector and improve its operating efficiency in the field of sewage treatment.
Highlights
Conventional sewage treatment methods, such as membrane method, physical-chemical method and activated sludge method, have high cost and complex process, which restrict the advanced treatment of sewage
The research on steam ejector mainly focuses on the design optimization of structure and parameters of steam ejector, the improvement of ejector performance and the reduction of energy consumption of coupling system
Steam ejector (Fig.1) is the key equipment used in the coupling system of steam ejector and multi-effect evaporator
Summary
A large amount of untreated sewage is discharged directly, causing serious water pollution. Conventional sewage treatment methods, such as membrane method, physical-chemical method and activated sludge method, have high cost and complex process, which restrict the advanced treatment of sewage. The coupling system of steam ejector (TVC) and multieffect evaporator (MED), as a low-cost and highefficiency sewage treatment method, has become one of the research hotspots of industrial sewage treatment technology. The analysis of the present situation shows that there are few studies on the influence of operating parameters on the steam flow state in the steam ejector and the influence of determining the injection position on the steam ejector, which greatly affects the research and optimization of the performance of the coupling system between the steam ejector and the multi-effect evaporator. In this paper, the internal flow state of steam ejector is numerically simulated, and the influence of operating parameters on the flow of steam ejector is analyzed, and the influence of ejector position on the water production ratio of steam ejector multi-effect evaporation desalination system is determined
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