基于动态仿真系统的空分及高压氮气管路节能优化研究

Research on Energy Saving Optimization of Air Separation Unit and High Pressure Nitrogen Pipeline Based on Dynamic Simulation System

针对国内首台整体煤气化联合循环电站,建立了关于该电站空分设备和全厂主要高压氮气使用设备及管路的实时动态仿真系统。在不同负荷下稳态运行的仿真测试表明,建立的实时动态仿真系统对于现场运行状态的仿真结果误差小于5%,表明该仿真系统具有较高的精度,能够用于对实际物理过程的仿真。利用该实时动态仿真系统对新增氮气储罐布置于原有空分至高压氮气缓冲储罐之间的管路来收集放空氮气同时平稳原有高压氮气管路压力波动的改造方案进行了研究,结果表明改造方案相比现有方案可以减少高压氮气管路系统压力波动范围,且串联布置方式优于并联布置方式。

A real-time dynamic simulation system for the air separation unit and the main high-pressure nitrogen equipment and pipelines of the power plant has been established for the first integrated gasification combined cycle power plant in China.The simulation test of steady-state operation under different loads shown that the error between the computation by the established realtime dynamic simulation system and the field operation data is less than 5%,indicating that the simulation system has high accuracy and can be used to simulate the actual physical process.The real-time dynamic simulation system was then used to study the proposed operation scheme of an additional nitrogen storage tank arranged in between the original air separation unit and the high-pressure nitrogen buffer tank to collect the vented nitrogen and stabilize the pressure fluctuation of the original high-pressure nitrogen pipeline.The results shown that the proposed operation scheme can reduce the pressure fluctuation range of the highpressure nitrogen pipeline system compared with the existing one.And the addition nitrogen storage tank should be placed in series fashion rather than parallel fashion to achieve better effects.