3G3RV-PDRT2

3G3RV-PDRT2

3G3RV-PDRT2

3G3RV-PDRT2

3G3RV-PDRT2

为保证整个锅炉系统的稳定运行，改造前机组通过调节给水泵液偶输出转速的方式改变给水流量，保持汽包的液位稳定。由于给水泵转速较高，液力偶合器主要由两部分组成，一是增速齿轮，这一部分的作用是把电动机的额定转速，升高至满足给水泵额定工况的运行转速；二是泵轮、涡《联系人；欧先生》
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轮、勺管、和循环油系统，其作用是通过勺管调节循环油，改变偶合器内的充油量，从而调节涡轮转速，实现输出转速的调速。机组正常运行时，就采用单台给水泵供水运行方式，另外一台泵处于备用状态，两台给水泵之间只需按规程进行定期倒泵操作。
三、可行性分析
3.1存在的问题
瑞平电厂在采用液力偶合器调速时，虽然能满足锅炉供水调节的功能，但是发现存在以下问题：
（1）给水泵采用液偶传动调速运行，传动损失大、系统效率低，造成大量能源浪费。
（2）调速范围有限为50～95%，转速不稳定，高速段减小了设备的出力能力，低速段影响节能效益的发挥；
（3）调速精度低，线性度差，响应慢，不大适应自动控制要求；
（4）液偶调速器采用高压传动油工作，在机械能传递过程中产生大量热量损失。
（5）电机虽然可以不带载启动，但仍然有5倍左右的冲击电流，影响电网稳定；
（6）由于存在较为复杂的油系统，液偶维护量较大，单台4000KW的液力偶合器平均每年的维护费用就近20W，严重浪费人力及影响生产。同时由于液力偶合器启动时仍具有的较大冲击电流，会对电厂的系统稳定造成影响，瑞平电厂技术人员寻找适合的替代方案，经多方对比发现，利用高压变频器替换目前给水泵液偶调速控制，具有 的解决方案。同液偶调速方案相对比，高压变频器调速系统具有以下优势：
（7）调速范围宽0-140%，调速精度高，响应速度快
（8）效率高（大于96%），且在20%负荷以上时均稳定在96%
（9）可实现真正的软启动，对电动机和电网无冲击，可降低给水泵及电动机的故障率，减少维修费用
（10）输入功率因数高可达0.95以上，只吸收很少的无功
（11）易维护；改造、调试周期短；故障时可切换工频运转，适用于不允许停机的场合。

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