以临海钢铁企业的水电共生海水淡化新技术系统为对象，针对该系统以汽轮机乏汽作为低温多效蒸发海水淡化的热源，汽轮发电机组与海水淡化机组耦合紧密，联合安全控制难度大、技术缺乏的问题，从优先考虑设备安全运行的角度，设计了适合水电共生工艺的启动逻辑、设备故障下的设备安全联锁保护逻辑、汽轮机低负荷场景下海水淡化装置的模式切换保护逻辑等安全控制策略，可实施对汽轮发电机组和海水淡化装置的双向联锁保护。该技术方案在某沿海钢铁厂的实际运用结果表明，所设计的水电共生安全控制策略，可实现整个系统的安全有序启动；在设备故障场景下能够实现主设备系统的双向安全联锁停机，具备既可在汽轮发电机组故障时连停海水淡化装置，也可以在海水淡化装置故障时连停汽轮发电机组；同时，安全策略能适应钢厂煤气大负荷调节的需要，安全运行效果明显。

Taking the hydropower symbiosis seawater desalination new technology system of a coastal steel enterprise as the subject, this paper addresses the challenges of using the steam turbine's exhaust steam as the heat source for low-temperature multi-effect evaporation seawater desalination within a system where the steam turbine generator set is closely coupled with the seawater desalination unit, presenting significant difficulties in joint safety control and a lack of technical solutions. From the perspective of prioritizing equipment safety, this paper designs safety control strategies suitable for the hydropower symbiosis process, including start logic, equipment safety interlocking protection logic under equipment failure conditions, and mode switching protection logic for the seawater desalination unit during low steam turbine load scenarios, enabling bidirectional interlocking protection for the steam turbine generator set and the seawater desalination unit. The practical application of this technical scheme at a certain coastal steel plant demonstrates that the designed hydropower symbiosis safety control strategies can achieve a safe and orderly start-up of the entire system. In the event of equipment failure, it can realize a bidirectional safe interlocking shutdown of the main equipment system, capable of stopping the seawater desalination unit in conjunction with the failure of the steam turbine generator set, and vice versa. Concurrently, the safety strategy can adapt to the needs of large load adjustments of the steel plant's gas supply, with significant effects on safe operation.

TK323

国家科技支撑计划课题（2015BAB10B01）