回汽保护控制下舰用蒸汽动力系统响应规律

Response pattern of marine steam power system under back-steam protection

回汽保护是缓解蒸汽动力舰船紧急减速时汽包压力骤升幅度、提高舰船机动性的有效措施。建立增压锅炉、主汽轮机、调节阀等设备模型,集成了回汽保护系统仿真模型,并应用试验数据对仿真模型进行了校验。对不同回汽保护控制条件下蒸汽动力系统响应规律进行仿真研究,研究结果表明:倒车调节阀开度越大、开阀时间越短,汽包压力骤升幅度越小,回汽保护效果越明显;倒车调节阀开度越大,冷凝器喉部最高温度越高,而开阀时间对于冷凝器喉部最高温度无明显影响。

The back-steam protection is an effective measure to improve the maneuverability of steampowered ships through reducing the amplitude of the growth of drum pressure caused by the ship's emergency deceleration.The simulation models of the composition units and whole system for back-steam protection system were built and validated through the experimental date,including the supercharged boiler,main steam turbines,valves.The response pattern of marine steam power system on the different control of back-steam protection was researched.The results show that the rising amplitude of the drum pressure with the larger valve opening and the less opening valve time decreases,so the effect of the backsteam protection is more obvious.Also,the larger valve opening,the higher maximum condenser inlet temperature.Moreover,there is no significant influence on the maximum condenser inlet temperature in different opening valve time.