直冷式空冷机组燃料BTU实时校正方法研究
Study on Real-time Correction Method of Fuel BTU for Direct Air-cooling Unit
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摘要:
煤质的频繁变化严重影响着直冷式空冷机组的特性和效率。火电厂来煤不稳定且实际煤种发热量很难实时准确的得到，给机组协调控制系统的设计带来很大困难。对此，针对直冷式空冷机组研究了一种基于模型的燃料BTU校正方法，用机组负荷实际值与机组模型负荷预测值的比值来反映实际煤种发热量与设计煤种发热量的关系，实时校正进入锅炉的燃料量，消除入炉煤质变化对机组协调控制系统的影响。经仿真实验和实际数据验证：在煤质频繁波动情况下协调控制系统控制品质良好，煤质稳定情况下不会对协调控制产生影响；得到的BTU校正系数不受模型输入信号的影响，能实时准确反映实际煤发热量的变化。该方法可行且有效，可适应现场煤质频繁变化的情况。 Abstract:The frequent changes of coal calorific value seriously affect the characteristics and efficiency of direct air-cooling unit. Source instability of coal in thermal power plant and difficulty in getting the actual calorific value of coal real-time and accuracy brings great difficulties for the design of unit coordinated control system.Therefore, A model-based fuel BTU correction method for direct air-cooling unit. is studied. The ratio between the actual value of the unit load and the forecast load of the unit model is used to reflect the relationship between the calorific value of the actual coal and design of calorific value of coal. Therefore, the fuel quantity entering the boiler is corrected in real time and the influence of coal calorific value variation on the unit coordinated control system is eliminated. Through simulation experiment and actual data validation, the coordination control system has good control quality in the case of frequent coal calorific value fluctuation and there is no effect when coal calorific value is stable. What's more, the obtained BTU correction coefficient is not affected by the input signal of model, which can accurately reflect the actual coal calorific value changes in real time. This method is feasible and effective and it can be adapted to the frequent changes of coal quality in the field.
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