CN206554985U - 一种带预暖功能的零号高压加热器系统 - Google Patents
一种带预暖功能的零号高压加热器系统 Download PDFInfo
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- CN206554985U CN206554985U CN201621086507.4U CN201621086507U CN206554985U CN 206554985 U CN206554985 U CN 206554985U CN 201621086507 U CN201621086507 U CN 201621086507U CN 206554985 U CN206554985 U CN 206554985U
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- 238000010438 heat treatment Methods 0.000 title claims abstract description 11
- 230000001105 regulatory Effects 0.000 claims abstract description 32
- 238000005086 pumping Methods 0.000 abstract description 2
- 238000010977 unit operation Methods 0.000 description 5
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Abstract
本实用新型在燃煤发电机组在宽负荷运行时应用，具体为一种带预暖功能的零号高压加热器系统，包括连接零号高压加热器和高压缸的主管道，主管道上安装有调节阀Ⅰ，主管道上设置有调节阀Ⅰ的旁路管道，旁路管道上安装有调节阀Ⅱ；在满负荷运行时，主管道上的调节阀Ⅰ均关闭，旁路管道上的调节阀Ⅱ均开启；在非满负荷时，主管道上的调节阀Ⅰ均开启，旁路管道上的调节阀Ⅱ均关闭。本实用新型在主管道上设置调节阀的旁路，根据机组的运行情况，调节主管道或者旁路开启，进而使一部分的抽气进入零号高压加热器，使零号高压加热器壳端维持在一定的温度，减少零号高压加热器壳端在运行和非运行状态的温差。
Description
一种带预暖功能的零号高压加热器系统
技术领域
[0001]本实用新型在燃煤发电机组在宽负荷运行时应用，具体为一种带预暖功能的零号 高压加热器系统。
背景技术
[0002]随着我国经济的快速发展，居民用电和商业用电的比重逐年增加，导致用电负荷 峰谷差激增，使得按照带基本负荷设计的600MW级和1000MW级超超临界机组不得不参与调 峰，且通常处于低负荷运行。根据全国现役1000MW超超临界机组的运行情况统计，低于70% 负荷下机组的运行小时数约占35%。河南省1000MW级机组运行负荷多数时间运行在75-50% THA负荷之间，夏季100%THA运行所占小时数仅为585h。
[0003]机组低负荷时，采用滑压方式运行，不在设计“经济区”下。机组效率较低，造成供 电煤耗升高，无法发挥超超临界机组高效率的优点，造成不必要的较大经济损失。
[0004]对大机组宽负荷的超超临界机组展开研宄，突破超超临界机组低负荷运行时效率 低、无法发挥超超临界机组优势的技术瓶颈，提升电力工业的技术水平，经济和社会效益非 常显著。
[000S]其中在一号高压加热器出口增设零号高压加热器，能提高低负荷时的最终给水温 度，从而改善汽轮机在低负荷的运行经济性。
[0006]零号高压加热器(简称零号高加)在75%负荷时完全投入(此时给水温度与THA工况 给^温度相当），机组在7S%负荷以下运行时，零号高加完全投入运行;机组在75%负荷以上 运行时，零号高加通过调整抽汽调节门开度来控制零号高加出口水温基本不变(维持给水 温度与THA工况给水温度相当）。
[0007]_ _在机组运行在满负荷时，零号高加不投运，此时零号高加壳端运行在较低温度;在 机组运行在低f荷时，零号高加投运，此时零号高加壳端运行在较高温度。因此，机组宽负 荷运行时，零号高加壳端温度变化较大，导致其热应力等相关参数有较大变化，不利于设备 良好运行。 实用新型内容
[0008]本实^新型要解决的技术问题是：零号高压加热器不投运的时候运行在较低温 度，在投入运行时，零号高压加热器壳端运行在较高温度，零号高压加热器壳端温度变化较 大，为解决上述问题，提供一种带预暖功能的零号高压加执器手％
[0009]本实用新型的目的是以下述方式实现的： ^ ° _0]-种带丽功能的零号高励热器系统，包括连J妾零号高压加热器和高压缸的主 管道，主管道上安装有H周节阀I，主管道上设置有调节阀〗的旁路管道，旁路管道上安装有调 节阀n ;在满负荷运行时，主管道上的调节阀I均关闭，旁路管道上的调节阀n均开启;在非 满负荷时，主管道上的调节阀I均开启，旁路管道上的调节阀n均关闭。
[0011]调节阀包括设置在主管社的气动止回阀j、电动截止阔r和气动调节阀【。
[0012]旁路包括与主管道连接的旁路管道，旁路管道上设置有气动止回阀n、电动截止 阀n和气动调节阀n。
[0013]主管道上调节阀I包括气动止回阀I、电动截止阀I和气动调节阀I，旁路管道上的 调节阀n包括气动止回阀n、电动截止阀n和气动调节阀n。
[0014]相对于现有技术，本实用新型在主管道上设置调节阀的旁路，根据机组的运行情 况，调节主管道或者旁路开启，进而使一部分的抽气进入零号高压加热器，使零号高压加热 器壳端维持在一定的温度，减少零号高压加热器壳端在运行和非运行状态的温差。
附图说明
[0015]图1是本实用新型整体结构示意图。
[0016] 其中，1是主管道;2是气动止回阀I; 3是电动截止阀I; 4是气动调节阀I; 5是旁路管 道;6是气动止回阀n;7是电动截止阀n;8是气动调节阀n;9是零号高压加热器;10是高压 缸;11是主蒸汽补汽阀。
具体实施方式
[0017] 如图1所示，本实用新型包括连接零号高压加热器9和高压缸10的主管道1，以及安 装在主管道1上安装的调节阀I，调节阀I包括气动止回阀12、电动截止阀13、气动调节阀14， 旁路管道5安装在主管道1上气动止回阀12和气动调节阀14的两端，旁路管道5上安装有调 节阀n，调节阀n包括气动止回阀n 6、电动截止阀n 7、气动调节阀n 8。高压缸1〇上连接有 主蒸汽补汽阀11。
[0018] 本实用新型的工作原理及工作过程为：
[0019] 在机组运行在满负荷时，主管道1上的气动止回阀12、电动截止阀13、气动调节阀I 4均关闭，旁路管道5上的气动止回阀n 6、电动截止阀n 7、气动调节阀n 8均开启，通过调节 气动调节阀ns开度来控制一部分抽气进入零号高压加热器9,使零号高压加热器壳端维持 一定温度;在机组运行在非满负荷时，旁路管道5上的气动止回阀116、电动截止阀117、气动 调节阀n 8均关闭，主管道1上的气动止回阀12、电动截止阀13、气动调节阀14均开启，通过 调节气动调节阀4开度来控制零号高压加热器9管端出口水温，此时零号高压加热器9正常 运行。
Claims (4)
1.一种带预暖功能的零号高压加热器系统，其特征在于:包括连接零号高压加热器和 高压缸的主管道，主管道上安装有调节阀I，主管道上设置有调节阀〗的旁路管道，旁路管道 上安装有调节阀n ;在满负荷运行时，主管道上的调节阀I均关闭，旁路管道上的调节阀jj 均开启;在非满负荷时，主管道上的调节阀I均开启，旁路管道上的调节阀n均关闭。
2. 根据权利要求1所述的一种带预暖功能的零号高压加热器系统，其特征在于°:调节阀 包括设置在主管道上的气动止回阀I、电动截止阀I和气动调节_[。
3. 根据权利要求2所述的一种带预暖功能的零号高压加热器系统，甘特征在于.旁路包 括与主管道连接的旁路管道，旁路管道上设置有气动止回阀n、电动截止阀n和气动调节 阀n 〇
4. 根据权利要求3所述的一种带预暖功能的零号高压加热器系统，其特征在于:主管道 上调节阀I包括气动止回阀I、电动截止阀I和气动调节阀I，旁路管道上的调节阀n包括气 动止回阀n、电动截止阀n和气动调节阀n。
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