电厂发电机氢气冷却系统(严选)
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毕业设计(论文) `题目发电机氢气冷却系统报告院系自动化系专业班级自动化专业1302班学生姓名杨晓丹指导教师马进发电机氢气冷却系统报告摘要发电机在运行的过程中由于能量转换、电磁作用和机械摩擦会产生一定的热量。
为了使发电机温度不超过与绝缘耐热等级相应的极限温度,应采取冷却措施使这些部件有效地散热。
氢气比重小、比热大、导热系数较大、化学性质较稳定,是冷却发电机转子常用的介质。
氢气在发电机的腔室内循环,依次穿过冷热风室,由冷却器冷却。
发电机中的氢气容易发生泄漏,需要在轴与静密封瓦之间形成油膜封住气体。
在发电机检修后,发电机内充满空气,为防止氢气与空气混合产生安全隐患,充入氢气时应先做气密实验,再从下至上向发电机内充满二氧化碳,最后从上至下向发电机内充满氢气。
关键词:发电机;氢气冷却;气体置换;密封油系统Report of hydrogen cooling system forgeneratorAbstractGenerator in the process of running due to energy conversion, electromagnetic and mechanical friction generates heat.Hydrogen cooling system is used to limited the generator temperature exceed the limiting temperature of thermal class for electric machine insulation.Because of Hydrogen gas has small specific gravity,large specific heat,large coefficient of thermal conductivity and relatively stable chemical properties,it is the commonly used medium cooling generator rotor.Hydrogen is circulated in the generator hydrogen and cooled by corner cooler.In order to limite hydrogen leakage,oil seals the space between the shaft and static seal tile.After the generator maintenance, air is full of inside the generators.There was a safe hidden trouble if hydrogen is mixed into the oxygen.Carbon is blowed from the from the bottom to the full of generator to replace air after Sealing experiment was passed.And hydrogen is blowed from the from the full to the bottom of generator to replace carbon. Keywords:Generator;Hydrogen cooling;Gas replacement;Seal oil system目录1 引言 (5)1.1发电机冷却系统的重要性 (5)1.2氢气冷却的优势 (6)2 发电机氢气系统组成、功能及原理 (7)2.1氢气系统的组成 (7)2.2氢气系统部件的功能及原理 (8)2.3氢气的循环冷却 (8)3 密封油系统 (9)3.1密封原理 (9)3.2密封油系统的组成 (9)4发电机的气体置换 (10)4.1气密试验 (10)4.2二氧化碳和氢气用量估计 (11)4.3二氧化碳置换空气 (12)4.4氢气置换二氧化碳 (12)4.5二氧化碳置换氢气 (12)参考文献 (13)1 引言1.1发电机冷却系统的重要性发电机在工作的过程中由于能量转换、电磁作用和机械摩擦会产生一定的热量,要使发电机的温度保持在材料限定温度范围内,就要配备发电机冷却系统。
毕业设计(论文) `题目发电机氢气冷却系统院系专业班级学生姓名指导教师二○15年六月发电机氢气冷却系统摘要随着电厂装机容量的提升,发电设备的冷却环节越来越重要,所用到冷却介质也是多种多样。
在对发电机进行冷却技术当中,氢冷技术是最为成熟、应用最为广泛的几种技术之一。
由于氢气本身的特点以及工作环境的要求,氢冷系统当中有几项十分重要的环节,如氢气的置换、冷却、干燥、密封。
这几个环节直接决定着整个系统的冷却效果,也是发电机安全工作的重要影响因素。
关键词:发电机;氢冷技术;置换;冷却;干燥;密封Generator Hydrogen Cooling SystemAbstractWith the increase of installed capacity, the process of generator-cooling is more and more important . The kind of coolant medium is also miscellaneous. Among the methods about cooling generators, hydrogen-cooling is one of the most mature and widely technology.Because of the characteristics of hydrogen and the demand of operational environment, Hydrogen Cooling System has some important parts, such as replacing, cooling, drying and leaking proof hydrogen. These links directly determine the cooling effect of the whole system, which essential to the safety of generators.Keywords:Hydrogen-cooling; replacing; cooling; drying; leaking proof;目录目录发电机氢气冷却系统 (2)Generator Hydrogen Cooling System (3)Abstract (3)目录 (4)1、绪论 (5)1.1发电机冷却技术背景 (5)1.2发电机常见的冷却方式 (5)1.3发电机氢冷方式普及原因 (5)1.4论文的主要内容 (6)2、氢气置换的实现方式 (7)2.1氢气置换总则 (7)2.2氢气置换的实现方法——中间介质置换法 (7)2.3采用中间介质置换法应注意的事项: (8)3、氢气冷却系统 (9)3.1氢气冷却器简介 (9)3.2氢冷器的构造 (9)4、氢气干燥系统 (10)4.1未经处理的氢气湿度大的原因 (10)4.2湿氢气的危害 (10)4.3氢气干燥器的工作原理及运行方式(以冷凝式干燥器为例) (10)5、密封油系统 (11)5.1密封油系统简介及其功能 (11)5.2密封油系统工作流程及运行方式 (11)5.3密封油的运行时的注意事项 (12)参考文献 (13)1、绪论1.1发电机冷却技术背景在电力生产过程中,当发电机运转将机械能转化成电能时,不可避免的会产生能量损耗。
发电机氢气冷却系统原理English:The hydrogen cooling system for a generator is based on the principle of using hydrogen gas as a coolant to remove the heat generated during the operation of the generator. The system typically includes a gas-tight generator casing that contains the hydrogen gas, a gas circulation system with a compressor and coolers, and a hydrogen storage and purification system. During operation, the hydrogen gas flows through the generator stator and rotor windings to remove the heat generated by the electrical resistance and magnetic losses. The gas is then circulated through a heat exchanger or cooler to remove the heat, and then purified and recirculated back into the generator. The use of hydrogen as a coolant offers several advantages, including high thermal conductivity, low density, and low viscosity, which allows for efficient heat removal and reduced windage losses. Additionally, hydrogen has a high specific heat capacity, allowing it to absorb a large amount of heat without a substantial increase in temperature. Overall, the hydrogen cooling system provides an effective andefficient method for managing the heat generated during the operation of a generator.中文翻译:发电机的氢气冷却系统是基于使用氢气作为冷却剂,以去除在发电机运行过程中产生的热量的原理。
发电机氢气冷却规程汽机车间2012年1月发电机氢气冷却规程第一章总则1.0.1 发电机氢气冷却或氮气冷却运行,均应保持0.03~0.05Mpa风压,密封油压保持比风压高0.03~0.05Mpa,只有氢气系统故障及试运行期间,才允许发电机以氮气冷却作短时间运行。
1.0.2 氢气冷却时,无论停机或运行中,皆应保持风压和密封油压,排烟机连续运行,如因故障停运排烟风机,主油箱排气门应打开。
1.0.3 氮气冷却时,氢气总门后应装有带尾巴的堵板,停机后可不再保持风压并停止排烟风机及密封油泵运行。
1.0.4 氢罐的氢气纯度不得低于99.5%,氧气和其它气体的含量不得大于0.5%,湿度小于6g/m3,氢罐压力应保持在0.2~0.6Mpa之间。
1.0.5 氮气母管应经常保持纯度在97.5%以上,含氧量小于2%的可靠汽源,氮气母管压力保持在0.2~0.4Mpa。
1.0.6气体置换操作在发电机运行中和停止中均可进行,但不得在启动中进行,气体置换操作应有能胜任此项操作的监护人及操作人担任,在操作中不能做与此无关的工作,更不能离开操作现场。
1.0.7 氮气冷却运行时,发电机气体操作台前,至少应有2~3瓶二氧化碳,以作氮气的备用气源。
氢冷发电机冷却气体的置换第一节氮气置换空气条件2.1.1氮气置换空气条件(1)发电机所属油系统工作结束,工作票终结,手续办理。
(2)氮气总门前的排污门,氮气一、二次门间的排污检查门打开,排污达10分钟以上化验氮气合格。
(3)密封油系统具备注油条件,密封油泵送电。
(4)发电机及密封油系统表记投运。
(5)氢气干燥器氧化铝未失效。
(6)关闭氮气一、二次门,开启氮气检查门判断氮气一次门应严密。
2.1.2 氮气置换空气的操作(1)检查氢气总门关闭且门后有带尾巴的堵板。
(2)检查发电机抽真空门关闭且门后有带尾巴的堵板。
(3)检查开启手动补氢气,门及补氢电磁阀旁路门。
(4)检查关闭H2取样门及排N2、H2至室外门,排污总门。