330MW机组凝结水泵变频系统的仿真研究.docVIP

准能矸电330MW机组凝结水泵变频系统的仿真研究 摘 要 近年来，随着火电厂对节能减排技术的迫切需求，对因此火电机组及其辅机设备的节能改造工作是非常重要的。一般电厂采用的凝结水泵都是定速驱动的水泵，通过改变出口阀的开度来调节流量，这种调节方式存在严重的节流损耗。本文通过对准能矸电330MW机组凝结水泵变频系统的仿真研究，比较了凝结水泵的节能改造方法，提出了水泵变频改造的计划。改造后运行表明，改造后有效减少了凝结水泵电动机起动时的电流冲击，并且节能效果明显，对于安全运行，延长设备的寿命都有着重要的意义，为火电厂凝结水泵变频改造提供借鉴。 关键词：火电厂；330 MW直接空冷机组；凝结水泵；电动机；变频改造 ZHUN NENG GANGUE ELECTRICITY OF CONDENSATE PUMP FREQUENCY CONVERSION SYSTEM OF 330 MW direct air cooling unit SIMULATION RESEARCH Abstract In recent years, the urgent need of energy conservation and emissions reduction technology as the power plant, for thermal power unit and its auxiliary equipment of energy-saving renovation work is very important. Condensate pump general plant are used in constant speed pump driven by the opening, change the outlet valve to regulate flow, this regulation has the serious throttle loss. In this paper, aim at to bottles of condensate pump frequency conversion system of 330 mw power simulation, comparison of the condensate pump energy saving transformation method, proposed the water pump frequency conversion transformation plan. After transforming operation show that the modified effectively reduced the condensate pump motor starting current shock, and energy saving effect obviously, and for the safe operation, has an important significance to prolong the service life of equipment, provide reference for power plant condensate pump variable frequency modification. Key Words： thermal power plant；330 MW unit；condensate pump；frequency-varying retrofit 目 录 摘 要 I Abstract II 1 绪 论 1 1.1 研究背景及变频改造的意义 1 1.2 国内外发展现状及发展趋势 1 1.3 本文主要工作 4 2 准能矸电330MW锅炉设备规范及直接空冷系统介绍 5 2.1 锅炉型式及特点 5 2.2 汽水系统 6 2.3 风烟系统 7 2.4 直接空冷系统 8 3 发电厂凝结水泵介绍 10 3.1 凝结水泵在电厂中的作用 10 3.2 凝结水泵简介及其工作原理 10 3.3 凝结水泵的参数及特征 11 4 异步电动机调速 14 4.1 异步电动机调速介绍 14 4.2 变极调速 14 4.3 变频调速 14 4.4 变频器的调速类型 16 4.5 变频控制回路中的PWM控制策略 17 4.6 电厂凝结水泵变频调速应注意的问题 18 5 准能矸电330MW凝结水泵变频系统的仿真研究 19 5.1 准能矸电330MW凝结水泵变频改造 19 5.2 仿真研究算法说明 21 5.3 凝结水泵变频改造的运行分析 27 5.4 改造后优缺点 29 5.4.1 变频调节优点 29 5.