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摘 要:华能营口电厂#2机组汽轮机为前苏联哈尔科夫汽轮机厂制造,自高压抗燃油液压控制系统改造后,高压缸绝对膨胀值显著变小、轴向位移增大。本文通过机组运行数据对比确定可能造成上述问题的原因,分析机头部分滑销系统卡涩是引起高压缸绝对膨胀值变小和轴向位移增大的原因。滑销组卡涩影响级内效率,增加运营燃料成本。同时滑销断裂或突然恢复将造成机组振动突变,从而触发机组保护动作,甚至使动静叶片发生刮蹭危及人身和设备安全。
关键词:汽轮机 轴向位移 绝对膨胀 滑销系统 设备安全
中图分类号:TK16 文献标识码:A文章编号:1674-098X(2021)04(b)-0109-03
Cause analysis of axial displacement increase of steam turbine and absolute expansion failure of high pressure cylinder
LIU Shancong1 LI Shiyue2
(1.Huaneng Yingkou Power Plant, Yingkou, Liaoning Province,115007 China; 2.Huaneng Yingkou Thermal Power Co., Ltd., Yingkou,Liaoning Province ,115000 China)
Abstract:The #2 steam turbine of Huaneng Yingkou Power Plant is manufactured by Kharkov Steam Turbine Factory of the former Soviet Union. Since the reform of DEH, the absolute expansion value of the high pressure cylinder has decreased significantly and the axial displacement has increased. In this post, through the comparison of the #2 unit operation data, the possible causes of the above problems are determined,and it is analyzed that the turbine head part jam of the sliding pin system is the cause of the decrease of the absolute expansion value of the high pressure cylinder and the increase of the axial displacement. The jam of sliding pin group affects the internal efficiency and increases the fuel cost. At the same time, the sudden recovery of sliding pin will cause a sudden vibrat change of the #2 unit , which will trigger the protection action of the #2 unit , and even make the moving and static blades scratch, endangering the safety of personnel and equipment.
Key words: Steam turbine; Axial displacement; Absolute expansion; Sliding pin system; Equipment safety
1 設备简介
华能营口电厂#2机组汽轮机为前苏联哈尔科夫汽轮机厂制造,后经供热改造的N330/C250-23.5/0.44/540/ 540型、超临界参数、非调节抽汽、一次中间再热、单轴三缸两排汽凝汽式汽轮机。经高压抗燃油液压系统改造后,高压缸绝对膨胀值在同负荷下显著变小,同时高负荷时轴向位移显著增大,运行期间需依靠调整供热供汽量缓解轴向位移过大的问题。
2 研究背景介绍
随着社会进步人民生活质量逐步提高,一方面供热需求日益增大,另一方面国家对能源能耗问题以及环保问题的关注日趋强烈。而我国人口众多,其中多以煤炭、石油、天然气为主要的能源,发改委“十三五规划”中指出煤炭消费比例从2015年的64%降到2020年的58%以下,接近发展中国家的人均用电量,缩小与发达国家标准煤的使用量[1-2]。依靠限制供热避免轴向位移保护动作的操作,虽能缓解轴向位移增大的问题,但也严重限制了机组供热能力,降低了机组的综合效率,提高了电厂的燃煤消耗量,不利于节能减排。且当机组深度调峰时,需要将定滑压曲线向低负荷延伸,以保证机炉协调运行时机组主要参数匹配[3],但是深度调峰下汽轮机合理的主汽压力未必满足延伸的定滑压曲线[4]。因此,深调时限制供热将会给机组带来安全隐患。
3 故障诊断分析
通过机组控制系统调取数据,研究高压缸绝对膨胀变小和轴向位移增大的故障原因,并列出表1、表2。
关键词:汽轮机 轴向位移 绝对膨胀 滑销系统 设备安全
中图分类号:TK16 文献标识码:A文章编号:1674-098X(2021)04(b)-0109-03
Cause analysis of axial displacement increase of steam turbine and absolute expansion failure of high pressure cylinder
LIU Shancong1 LI Shiyue2
(1.Huaneng Yingkou Power Plant, Yingkou, Liaoning Province,115007 China; 2.Huaneng Yingkou Thermal Power Co., Ltd., Yingkou,Liaoning Province ,115000 China)
Abstract:The #2 steam turbine of Huaneng Yingkou Power Plant is manufactured by Kharkov Steam Turbine Factory of the former Soviet Union. Since the reform of DEH, the absolute expansion value of the high pressure cylinder has decreased significantly and the axial displacement has increased. In this post, through the comparison of the #2 unit operation data, the possible causes of the above problems are determined,and it is analyzed that the turbine head part jam of the sliding pin system is the cause of the decrease of the absolute expansion value of the high pressure cylinder and the increase of the axial displacement. The jam of sliding pin group affects the internal efficiency and increases the fuel cost. At the same time, the sudden recovery of sliding pin will cause a sudden vibrat change of the #2 unit , which will trigger the protection action of the #2 unit , and even make the moving and static blades scratch, endangering the safety of personnel and equipment.
Key words: Steam turbine; Axial displacement; Absolute expansion; Sliding pin system; Equipment safety
1 設备简介
华能营口电厂#2机组汽轮机为前苏联哈尔科夫汽轮机厂制造,后经供热改造的N330/C250-23.5/0.44/540/ 540型、超临界参数、非调节抽汽、一次中间再热、单轴三缸两排汽凝汽式汽轮机。经高压抗燃油液压系统改造后,高压缸绝对膨胀值在同负荷下显著变小,同时高负荷时轴向位移显著增大,运行期间需依靠调整供热供汽量缓解轴向位移过大的问题。
2 研究背景介绍
随着社会进步人民生活质量逐步提高,一方面供热需求日益增大,另一方面国家对能源能耗问题以及环保问题的关注日趋强烈。而我国人口众多,其中多以煤炭、石油、天然气为主要的能源,发改委“十三五规划”中指出煤炭消费比例从2015年的64%降到2020年的58%以下,接近发展中国家的人均用电量,缩小与发达国家标准煤的使用量[1-2]。依靠限制供热避免轴向位移保护动作的操作,虽能缓解轴向位移增大的问题,但也严重限制了机组供热能力,降低了机组的综合效率,提高了电厂的燃煤消耗量,不利于节能减排。且当机组深度调峰时,需要将定滑压曲线向低负荷延伸,以保证机炉协调运行时机组主要参数匹配[3],但是深度调峰下汽轮机合理的主汽压力未必满足延伸的定滑压曲线[4]。因此,深调时限制供热将会给机组带来安全隐患。
3 故障诊断分析
通过机组控制系统调取数据,研究高压缸绝对膨胀变小和轴向位移增大的故障原因,并列出表1、表2。