氧化铝分解槽循环水余能利用

Surplus energy reuse of circulating water power in alumina decomposition tank

为充分利用众多的氧化铝生产企业的分解槽循环水系统中存在的大量余能,并为其他类似余能回收提供技术支持,研究了氧化铝分解槽循环水系统中余能的特点.根据余能的多少,提出了不同的余能利用方案.重点研究了余能发电的利用方式.并针对余能发电的特殊性,设计了分解槽水循环系统余能发电装置——集成循环水余能发电装置.针对其循环水不能异常中断的问题,提出了循环水保护方案.针对通过机组的水量小于其空载流量时,水轮发电机会在并网条件下吸收电网功率的逆送电情况,提出了发电机逆功率保护方案,并将余能发电装置的控制保护各子系统集成在一起,形成具有励磁、调速、同期和保护功能的"四合一综合控制盘".实践证明,氧化铝分解槽循环水余能发电装置能安全、可靠、稳定运行.

To make full use of the large number of surplus energy in the circulating water system of a- lumina decomposition tank, and to provide technical support for energy recovery of other similar sys- tem, the characteristics of circulating water system of alumina decomposition tank have been studied. Based on the size of the system, different solutions of energy recovery have been put forward. The solu- tion of using the surplus energy to generate electricity has been mainly focused. And in view of its pe- culiarities ,the power generation device of the circulating water system in alumina decomposition tank was designed, which is called as the integrated power generation device for using the surplus of circulat- ing water. A circulating water protection process was proposed to solve the problem that the circulating water should not be cut down unexpectedly. An issue named inverse power will be occurred in genera- tor when the turbine discharge is smaller than that under non-load condition. Therefore, protection method for reverse power of generator was put forward, which included the generator excitation subsys-tem, speed control subsystem, synchronization subsystem and protect subsystem, all the subsystems of control and protect integrated together, forming the four unity comprehensive control panel. Practices have proved that the integrated power generation device for using the surplus energy of circulating water in alumina decomposition tank is safe, reliable and stable.