超超临界机组高压加热器水室结构强度研究

发布时间：2018-01-22 04:58

本文关键词： 高加水室结构应力应变测试数值模拟　出处：《西南交通大学》2017年硕士论文　论文类型：学位论文

【摘要】：我国的电力供应目前仍然以火力发电为主,严重依赖煤炭。与传统的发电技术不同,超超临界发电技术热循环效率更高,排放污染更少,是一种更加高效和先进发电技术。高压加热器是超超临界火力发电机组热力循环系统中的一个非常重要的组成设备,它的稳定运行是火力发电机组安全、经济运行的保障和前提。高加水室是高压加热器的主要承压部件,其汽水压力参数高,工况恶劣。论文采用应变电测试验方法和数值模拟方法,对高加水室的结构强度进行研究。应变电测试验是与高压加热器产品的出厂水压试验同步进行,通过粘贴在高加水室结构内、外壁的电阻应变计,运用应变数据采集仪器读取在高液压工况下应变计的数据,测量得到高加水室封头上开孔及其影响区域的应力;分析试验数据、并依据GB/T 16507.4-2013《水管锅炉-受压元件强度计算》标准研究水室结构的强度,判断其最高承载压力。参照高压加热器产品结构,按实际测量的真实尺寸建立高加水室结构的三维模型,采用有限元软件MSC.Patran作为前后处理器,以MSC.Nastran为数值求解器,模拟分析高加水室模型,用JB/T 4732《钢制压力容器—分析设计标准》的规定为判据,对有限元数值模拟的结果进行水室结构的强度评定。论文通过试验数据与模拟结果进行比对分析,研究了超超临界机组用高加水室的应力分布的典型特征和表现规律,对加热器的结构强度进行了计算校核和实验验证,为同类结构的强度评定提供了技术检验参考,为超规范设计提供了新的思路。
[Abstract]:The power supply in China is still dominated by thermal power generation and relies heavily on coal. Unlike traditional power generation technology, ultra-supercritical power generation technology has higher thermal cycle efficiency and less emission pollution. High pressure heater is a very important component equipment in the thermal cycle system of ultra supercritical thermal power generating unit, and its stable operation is the safety of thermal power generating set. High water chamber is the main pressure part of high pressure heater, its steam pressure parameter is high, the working condition is bad. The paper adopts strain electric test method and numerical simulation method. The strain electric test is carried out synchronously with the water pressure test of the high pressure heater products. The strain gauge is attached to the structure of the high water feeding chamber and the external wall of the resistor strain gauge. Using the strain data acquisition instrument to read the strain gauge data under the high hydraulic condition, the stress of the hole on the head of the high water filling chamber and its affected area is measured. The test data are analyzed and the strength of water chamber structure is studied according to GB/T 16507.4-2013 "strength calculation of water-tube boiler-pressure element". According to the product structure of high pressure heater, the three-dimensional model of high water chamber structure is established according to the actual measured size. The finite element software MSC.Patran is used as the front and rear processor and MSC.Nastran as the numerical solver to simulate and analyze the model of high water adding chamber. The criterion is JB/T 4732 "Steel pressure vessel-Analytical Design Standard". The results of finite element numerical simulation are used to evaluate the strength of the water chamber structure. The typical characteristics and performance rules of stress distribution of high water feeding chamber used in ultra-supercritical unit are studied. The structural strength of heater is calculated and verified by experiments. It provides a technical reference for the strength evaluation of similar structures and a new way of thinking for the design of supercode.
【学位授予单位】：西南交通大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：TM621.3

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