厄瓜多尔CCS水电站发电机层气流组织及特殊运行工况模拟

发布时间：2018-03-11 01:19

本文选题：水电站　切入点：通风空调　出处：《西安建筑科技大学》2014年硕士论文　论文类型：学位论文

【摘要】：目前，，水电作为一种可持续发展的能源形式在国内外水电中得到了快速发展，水电站的数量、规模不断扩大。水电站一般位于地下，为了排除室内各种电气设备和发电机散入室内的余热、余湿，保证厂房的温度、湿度和气流速度在允许的范围内，保障设备的安全运行和适宜的工作环境，这是水电站通风空调设计的主要任务。西安建筑科技大学大学、黄河勘测规划设计有限公司承担了位于南美洲、气候属热带雨林气候的厄瓜多尔CCS地下水电站通风空调理论分析研究与设计任务。本文利用CFD技术对黄河勘测规划设计有限公司初步提出的厄瓜多尔CCS地下水电站发电机层的气流组织进行了数值模拟及分析，数值计算时采用标准k-两方程模型、SIMPLE算法，壁面边界条件采用标准壁面函数，对不同送风速度，不同风口位置布置形成的厂房内温度场及气流速度采用速度不均匀系数k v、温度不均匀系数k t及能量利用系数、PPV—PPD指标和空气分布特性指标ADPI评价指标进行了综合评价对比，提出了适用于CCS水电站发电机层高大空间送风方式，送风高度及送风速度分别为4.5m和5m/s预期可以到达较好的通风效果。研究了该水电站运行过程中可能遇到两种特殊故障工况：主厂房空调系统停运的极端工况和水轮机压气发电工况情况的环境控制技术对策。空调停运时，夜间可以采用全通风方式的可行性；分别对1月、4月、7月和10月不同室外气象条件工况进行了数值模拟。水轮机压气工况下，由于压气过程中产生的热量散发洞内，造成洞内冷负荷的显著增加，模拟了故障工况下，主厂房温度、速度及湿度状况，并提出了技术对策。
[Abstract]:At present, hydropower, as a form of sustainable development of energy, has been developed rapidly at home and abroad, and the number and scale of hydropower stations are constantly expanding. The hydropower stations are generally located underground. In order to eliminate the residual heat and humidity of indoor electrical equipment and generators, to ensure that the temperature, humidity and airflow velocity of the plant are within the permitted range, and to ensure the safe operation of the equipment and a suitable working environment, This is the main task of ventilation and air conditioning design of hydropower station. Xi'an University of Architectural Science and Technology, Huanghe River Survey Planning and Design Co., Ltd. is responsible for the theoretical analysis and design of ventilation and air conditioning of CCS underground hydropower station in Ecuador, which is located in South America and has a tropical rain forest climate. In this paper, CFD technique is used to simulate and analyze the airflow distribution of generator layer of CCS underground hydropower station in Ecuador, which is initially proposed by Huanghe River Survey Planning and Design Co., Ltd. The standard k- two equation model and simple algorithm are used in the numerical calculation. The wall boundary condition is based on the standard wall function. The temperature field and airflow velocity formed by different tuyere positions are evaluated by using velocity inhomogeneity coefficient k _ v, temperature non-uniformity coefficient k _ t and energy utilization coefficient / PPV-PPD index and air distribution characteristic index (ADPI). This paper presents an air supply mode suitable for large space in generator layer of CCS Hydropower Station. The air supply height and velocity are 4.5 m and 5 m / s, respectively, and the ventilation effect is expected to be better. This paper studies two kinds of special malfunction conditions which may be encountered in the operation of the hydropower station: the extreme condition of shutdown of air conditioning system in main building and the environmental control technology countermeasure of hydraulic turbine pressurized air power generation condition, when the air conditioning is out of operation, The feasibility of adopting full ventilation at night, the numerical simulation of different outdoor meteorological conditions on January, April, July and July were carried out respectively. As a result, the cooling load in the tunnel is increased significantly, and the temperature, speed and humidity of the main powerhouse under the malfunction condition are simulated, and the technical countermeasures are put forward.
【学位授予单位】：西安建筑科技大学
【学位级别】：硕士
【学位授予年份】：2014
【分类号】：TV735;TV737

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