The astern turbine which exists in marine steam power plant is usually only used in astern condition. In or-der to prevent the boiler pressure from being overpressure in direction reversing process, it is essential to fully utilize back-steam control. In this paper, we build up mathematical model of steam power plant and propose a boiler-turbine coordinated control system with back-steam control. The simulation results of direction reversing process shows that compared with co-ordinated control system without back-steam control, the maximum main pressure deviation of boiler-turbine coordinated control system with back-steam technology is 1%less than that of coordinated control system without back-steam techno-logy. The boiler-turbine coordinated control system with back-steam control can provide greater stability of main steam pres-sure in direction reversing process. It can solve the problem of overpressure in direction reversing process.%船舶蒸汽动力装置中设置的倒车汽轮机,一般情况下只在船舶倒车工况时工作.为了克服船舶换向过程中锅炉超压的问题,应充分利用倒车汽轮机和回汽控制技术.本文以大型船舶蒸汽动力装置为研究对象,通过机理分析建立其数学模型,提出一种具有回汽控制的机炉协调控制方案,并对换向过程进行动态仿真.仿真结果表明使用回汽控制的机炉协调控制方式的主蒸汽压力偏差相对于不使用回汽控制的协调控制方式减小了1%,主蒸汽压力更稳定.可以得到结论,使用具有回汽控制的机炉协调控制方式可以解决换向过程中锅炉超压的问题.
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