密封油系统概述

1、ALSTOM (Switzerland)Ltd 2001Preliminary/for discussion purposes only. We reserve all rights in this document and in the information contained therein. Reproduction, use or disclosure to third parties without express authority is strictly forbidden.1发电机密封油系统概述Feb. 2006ALSTOM (Switzerland)Ltd 2001Prel

2、iminary/for discussion purposes only. We reserve all rights in this document and in the information contained therein. Reproduction, use or disclosure to third parties without express authority is strictly forbidden.2氢气的密封氢气的密封密封油的作用: 为了保证将一定压力的氢气密封于发电机机壳内, 不从动静间隙间溢出.密封油系统应用一切相关设备,使供油压力高于氢压0.5bar,保证

3、了氢气的密封.密封油系统的可靠性对机组运行的可靠性是非常关键的.密封油系统必须保证在机组静态(0 rpm)和带负荷运行(3000 rpm)时,都保证密封功能.ALSTOM (Switzerland)Ltd 2001Preliminary/for discussion purposes only. We reserve all rights in this document and in the information contained therein. Reproduction, use or disclosure to third parties without express autho

4、rity is strictly forbidden.3单流环密封油系统单流环密封油系统ALSTOM (Switzerland)Ltd 2001Preliminary/for discussion purposes only. We reserve all rights in this document and in the information contained therein. Reproduction, use or disclosure to third parties without express authority is strictly forbidden.4三流环密封油系

5、统三流环密封油系统三流环系统三流环系统 保证了在氢压较高时仍然有很低的漏氢量.实际的密封元件为套于轴上的密封环(氢侧和空侧), 与轴颈间的间隙非常小, 并沿轴向由密封瓦座定位和固定.密封环沿圆周有三个油槽密封环沿圆周有三个油槽. 每个密封油槽在环的的侧面沿圆周都钻有很多油孔, 密封油则在一定的设计油压下, 从油孔注入, 并填充到密封环和大轴间的间隙中去,起到密封的作用.ALSTOM (Switzerland)Ltd 2001Preliminary/for discussion purposes only. We reserve all rights in this document and i

6、n the information contained therein. Reproduction, use or disclosure to third parties without express authority is strictly forbidden.5三流环密封油系统三流环密封油系统1. 真空油真空油 2. 含空气的油含空气的油 3. 饱含氢气的油饱含氢气的油 4.空气中带有氢气空气中带有氢气(微量微量)ALSTOM (Switzerland)Ltd 2001Preliminary/for discussion purposes only. We reserve all ri

7、ghts in this document and in the information contained therein. Reproduction, use or disclosure to third parties without express authority is strictly forbidden.6密封环在瓦座内的情况密封环在瓦座内的情况空侧排油腔室空侧排油腔室氢侧排油腔室氢侧排油腔室空侧油空侧油真空油真空油氢侧油氢侧油氢气侧氢气侧空气侧空气侧虽然油源一致虽然油源一致,但是经过不同管路和设备但是经过不同管路和设备, 形成空侧、真空侧、氢侧油，注入到三个油槽中形成空侧、真

8、空侧、氢侧油，注入到三个油槽中ALSTOM (Switzerland)Ltd 2001Preliminary/for discussion purposes only. We reserve all rights in this document and in the information contained therein. Reproduction, use or disclosure to third parties without express authority is strictly forbidden.7三流环密封油系统三流环密封油系统三个不同的油路三个不同的油路：- 空侧油

9、空侧油,含空气含空气, 以高于氢压以高于氢压0.5bar的压力从空侧密封环的中间油槽注入。的压力从空侧密封环的中间油槽注入。-真空油真空油, 去处气体去处气体, 以高于空侧油大约以高于空侧油大约0.3bar的压力从空侧密封环和氢侧密封的压力从空侧密封环和氢侧密封环中间形成的油槽注入。环中间形成的油槽注入。- 氢侧油氢侧油, 饱含氢气饱含氢气, 以和真空油相同的压力从氢侧密封环中间的油槽注入。以和真空油相同的压力从氢侧密封环中间的油槽注入。ALSTOM (Switzerland)Ltd 2001Preliminary/for discussion purposes only. We reserv

10、e all rights in this document and in the information contained therein. Reproduction, use or disclosure to third parties without express authority is strictly forbidden.8密封油压力密封油压力空侧油入空侧油入真空油入真空油入氢侧油入氢侧油入真空油从空侧油回油流回真空油从空侧油回油流回, 保证了空气不进入发电机内部保证了空气不进入发电机内部, 进而保进而保证了氢气的纯度证了氢气的纯度.空侧和真空油空侧和真空油,回油在一起回油在一起

11、 氢侧回油氢侧回油 真空油真空油空侧油空侧油氢侧油氢侧油发电机外发电机外发电机内发电机内氢压氢压ALSTOM (Switzerland)Ltd 2001Preliminary/for discussion purposes only. We reserve all rights in this document and in the information contained therein. Reproduction, use or disclosure to third parties without express authority is strictly forbidden.9密封油

12、装置密封油装置集成式装置, 一般位于0m汽机房发电机下, 主油箱(空侧油箱)安装于装置侧. 装置与发电机靠油管路相连.空侧油箱空侧油箱真空油箱真空油箱ALSTOM (Switzerland)Ltd 2001Preliminary/for discussion purposes only. We reserve all rights in this document and in the information contained therein. Reproduction, use or disclosure to third parties without express authority

13、 is strictly forbidden.10密封油装置密封油装置真空油泵真空油泵空侧油泵空侧油泵氢侧油泵氢侧油泵密封油差压控制阀密封油差压控制阀真空油箱真空油箱ALSTOM (Switzerland)Ltd 2001Preliminary/for discussion purposes only. We reserve all rights in this document and in the information contained therein. Reproduction, use or disclosure to third parties without express a

14、uthority is strictly forbidden.11密封油装置密封油装置空侧油箱空侧油箱泄油观察窗泄油观察窗真空油箱真空油箱冷油器冷油器ALSTOM (Switzerland)Ltd 2001Preliminary/for discussion purposes only. We reserve all rights in this document and in the information contained therein. Reproduction, use or disclosure to third parties without express authority

15、 is strictly forbidden.12Air-Oil Circuit - 1In the air-oil circuit oil is pumped into the groove on the atmospheric side of the shaft sealing ring. The supply pressure at the ring is 0.5 bar above the hydrogen pressure in the generator.This circuit provides the sealing function, i.e. it serves to co

16、ntain the internal hydrogen pressure at the seal. In view of the importance of maintaining pumping power in this circuit, the main a.c. motor driven pump (1) is backed-up by a second a.c. and a d.c. motor driven pump. The cooler (2) and the filter (3) have both 100% redundancy. The air-oil tank (4)

17、provides the reservoir for the air-oil circuit. Oil is drawn from this tank by the service air-oil pump and pumped to the the seal oil unit and then to the air-side DE and NDE sealing rings via the air-oil cooler and filter.ALSTOM (Switzerland)Ltd 2001Preliminary/for discussion purposes only. We res

18、erve all rights in this document and in the information contained therein. Reproduction, use or disclosure to third parties without express authority is strictly forbidden.13Air-Oil Circuit 2 In order to ensure proper generator sealing, the seal oil pressure must be maintained 0.5 bar above the H2 p

19、ressure at all times and in all types of operation. This task is performed by the differential pressure controller (11), which leads the oil surplus back to the air-oil tank (4).Since the vacuum-oil pressure is set 0.3 bar higher than the air-oil pressure, the air-oil flows into the un-pressurised a

20、ir-side drain chambers and from there back to the air-oil tank.The oil vapour in air-oil tank is expelled by the exhaust blower (fan) (9). At the same time, this fan ensures that the necessary partial vacuum is present in the sealing ring housing.ALSTOM (Switzerland)Ltd 2001Preliminary/for discussio

21、n purposes only. We reserve all rights in this document and in the information contained therein. Reproduction, use or disclosure to third parties without express authority is strictly forbidden.14差压控制阀氢压氢压 (4 bar)(氢侧排油腔室压力氢侧排油腔室压力)空侧油压空侧油压 (4,5 bar)型号型号 42.25油流向见图中箭头所示. 阀芯(3)的位置影响了阀座(2)前后的油压差.阀位靠弹簧

22、(14)调整平衡, 压力取样脉冲管接至阀位控制室来根据氢压及空侧油压调整阀门开度,进而控制差压.差压控制阀对轻微的差压变化不起作用.ALSTOM (Switzerland)Ltd 2001Preliminary/for discussion purposes only. We reserve all rights in this document and in the information contained therein. Reproduction, use or disclosure to third parties without express authority is stric

23、tly forbidden.15Vacuum-Oil CircuitThe oil required for degasification is taken from the air-oil line downstream of the filter and taken to the vacuum tank (7) via the level control valve.All entrained gases are separated out of the oil by the vacuum pump (10) on the vacuum tank.The optimum vacuum-oi

24、l pressure can be adjusted by the vacuum pressure regulator (12).The evacuated oil is pumped between the two DE and NDE air-side and gas side sealing rings (middle groove) by the vacuum oil pump (8). The oil pressure in the vacuum oil circuit is set at the pressure regulations valve (12) and so that

25、 vacuum-oil pressure is always 0.3 bar higher than the air-oil pressure.As the H2 pressure is regulated to the same value, the vacuum-oil flows across the pressure drop to the air-oil and returns to the air-oil tankALSTOM (Switzerland)Ltd 2001Preliminary/for discussion purposes only. We reserve all

26、rights in this document and in the information contained therein. Reproduction, use or disclosure to third parties without express authority is strictly forbidden.16氢侧油路氢侧油路汽侧和励侧的氢侧密封油路各自独立.The H2-oil pumps (5) supply the hydrogen-saturated oil to the DE and NDE gas-side sealing rings via the H2-oil

27、 coolers (6). The oil level at the pump inlets is maintained constant by the two oil column controllers (e), which ensures that the H2-oil pressure is always adjusted to the vacuum-oil pressure at the shaft.Due to the pressure drop to the gas side of the generator, the H2-oil flows into the gas-side drain chambers and back to the H2-oil pumps. With the exception of control processes, this circuit can therefore be regarded as a closed oil circuit.ALSTOM (Switzerland)Ltd 2001Preliminary/for discussion purposes only. We reserve all rights in this document and in the informati