【摘要】 随着大型循环流化床机组的投产,流化床机组自身存在的热惯性大、迟滞性大、参数间耦合关系强烈的特点,使机组的自动控制及自动发电量控制(automatic generation control,AGC)功能的投入存在很大困难。通过对首台国产化300MW外置循环流化床机组协调控制策略等的优化,克服流化床机组热惯性问题,在保证运行过程的物料平衡、能量平衡以及两侧床压平衡(防止翻床)的基础上,优化协调控制系统,通过控制燃料量变化来提高对主汽压力偏差的响应速度,优化上、下层二次风量的控制来提高流化床锅炉的燃烧率,克服主蒸汽压力、床温、床压的强耦合,适应炉内大量床料的存在所产生的大惯性、非线性,最终投入AGC功能,取得满意的效果。更多还原

【Abstract】 With the commissioning of large-scale circulating fluidized bed units,it is very difficult to realize the input of the automatic control and automatic generation control (AGC) functions of the fluidized bed unit,due to its large thermal inertia and hysteresis,and the strong coupling between parameters.Through coordinated control strategy optimization of the first domestic 300 MW external circulating fluidized bed unit,the thermal inertia problem is overcome.By keeping the mass balance,energy balance and bed pressure balance,optimization of the coordinated control system improves its response speed to the main steam pressure derivation through controlling the fuel quantity.Optimization of the secondary air flow control on the upper and lower layers improves the combustion efficiency and overcomes the strong coupling between main steam pressure,bed temperature and bed pressure so as to make the unit adapt to the large inertia and nonlinearity produced by the large quantity of bed material in the furnace.The AGC function is eventually put into operation and satisfactory result has been achieved.On the basis of the problem of the final fluidized bed unit into AGC function,and achieved satisfactory results.更多还原