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以集总参数法为基础,建立了超临界循环流化床锅炉水冷壁动态特性的数学模型,并进行二次建模,得到了能够直接用数值积分法求解的动态方程组.开发了动态特性仿真程序,该程序能对不同负荷工况下,当燃料量、汽轮机进口阀门开度、给水流量与温度发生扰动时的水冷壁动态特性进行计算,为锅炉设计和安全运行提供了依据.对我国自主开发的1台600 MW超临界循环流化床(CFB)锅炉,在30%锅炉最大连续蒸发量(BMCR)和100%BMCR负荷工况下,当流量、压力、进口焓值、热负荷发生变化时的水冷壁动态特性进行了计算,得到过冷段长度、压力、出口焓值、工质温度与金属壁温的响应特性.结果表明:在扰动发生一段时间后,响应参数均趋于稳定不变,说明流动系统是稳定的,水冷壁设计和运行是安全可靠的.
Based on the lumped parameter method, the mathematical model of the dynamic characteristics of the water wall of a supercritical circulating fluidized bed boiler was built and the second order model was established. The dynamic equations which could be directly solved by numerical integration were obtained. Simulation program, which can calculate the dynamic characteristics of water wall at different load conditions, when the amount of fuel, turbine inlet valve opening, water flow and temperature disturbance, provide a basis for the design and safe operation of the boiler. A self-developed 600 MW CFB boiler, with flow rate, pressure, enthalpy of inlet, and thermal load occurring under the conditions of BMCR of 30% and load of 100% BMCR, The dynamic characteristics of the waterwall were calculated and the response characteristics of the length, pressure, outlet enthalpy, working fluid temperature and metal wall temperature were obtained.The results showed that the response parameters tended to be stable after a period of disturbance The same, indicating that the flow system is stable, water wall design and operation is safe and reliable.