不同布置方式下温排水对水域环境生态影响研究

发布时间：2018-04-30 11:54

本文选题：不同布置方式 + 温排水　；参考：《华北电力大学》2016年硕士论文

【摘要】：随着经济的快速发展,电能已经成为不可或缺的能源之一,对经济的发展和人民生活水平的提高起着至关重要的作用。作为电能输出的重要部门,电厂已经有了大规模的发展,对于很多采用直流冷却方式对机组进行冷却的电厂来说,大量温排水连续不断地排入自然水域,会对水域的环境生态造成不同程度的热影响,因此受纳水域中的鱼类、藻类等物种的生长和繁殖也将会受到严重影响。而生态系统中的各个组成物种之间又是相互联系和制约的,因此,温排水造成的热影响将会对整个水域环境生态系统造成影响。本文首先利用FLUENT软件对底部垂直式中的工况1进行数值模拟,将结果与已有文献中的试验结果进行对比。然后,在对比结果基本一致的情况下,利用该方法对侧向中部式、侧向底部式、同流中部式三种不同的温排水布置方式分别在相同四种工况下的温升情况进行模拟,分析了每种布置方式下温排水温升扩散规律以及对水域环境生态影响程度。最后,利用综合指数评价方法对不同布置方式下温排水对受纳水域中的鱼类、藻类、浮游动物、底栖动物这四种热影响指标分别在夏季及冬季两个不同季节下造成的生态环境热影响进行综合评价,总结出不同布置方式下温排水对水域生态环境的影响特点和规律,得出了对水域环境生态系统影响最大和最小的温排水布置方式,为实际工程中温排水方式的优化选取可提供一定的依据。
[Abstract]:With the rapid development of economy, electric energy has become one of the indispensable energy sources, which plays a vital role in the development of economy and the improvement of people's living standard. As an important sector of electric power output, power plants have developed on a large scale. For many power plants that use direct current cooling methods to cool their units, a large number of warm water drains are continuously discharged into natural waters. Therefore, the growth and reproduction of fish, algae and other species in the receiving waters will also be seriously affected. However, each species in the ecosystem is interrelated and restricted. Therefore, the thermal effect caused by temperature drainage will affect the whole water environment ecosystem. In this paper, FLUENT software is first used to simulate the working condition 1 in the bottom vertical equation, and the results are compared with the experimental results in the previous literatures. Then, under the condition that the comparison results are basically the same, the temperature rise of three different temperature and drainage arrangements under the same four working conditions are simulated by using this method, including the lateral middle type, the lateral bottom type and the same flow middle type. The law of temperature rise and diffusion of temperature drainage and the degree of ecological influence on water environment under each arrangement are analyzed. Finally, the comprehensive index evaluation method is used to evaluate the effects of temperature drainage on fish, algae and zooplankton in the receiving waters under different arrangements. The ecological and environmental thermal effects caused by the four heat impact indexes of benthos in summer and winter were evaluated synthetically, and the characteristics and rules of the effects of temperature drainage on the ecological environment of water area under different arrangement were summarized. The temperature drainage layout which has the greatest and least influence on the water environment ecosystem is obtained, which can provide a certain basis for the optimum selection of the temperature drainage mode in the actual engineering.
【学位授予单位】：华北电力大学
【学位级别】：硕士
【学位授予年份】：2016
【分类号】：X57;X82

【引证文献】