【摘要】 循环流化床燃烧系统因其高效性和低排放被越来越多的作为发电中的优越燃煤系统。然而,由于其非线性和复杂的变化,很难去给出一个全面的模型去包含全部的系统动态。床温是这些类型的操作系统中最为重要的参数之一,它影响着锅炉总效率和污染物的排放率。基于确定的系统模型结构,采用一个PID控制算法来控制床温,是通过输入参数即煤的输送速率和总风量来控制。该PID控制器可以实现输出对于输入的完美跟踪。控制器可以适当的设置温度到我们所期望的范围,并且最小化扰动对于闭环系统的影响。最后我们总结了输入的不确定性和内部参数的不稳定对于床温的影响。更多还原

【Abstract】 Circulating fluidized bed(CFB) combustion systems are increasingly used as superior coal burning systems in power generation due to their higher efficiency and lower emissions.However,because of their non-linearity and complex behavior,it is difficult to build a comprehensive model that incorporates all the system dynamics.Bed temperature,which influences boiler overall efficiency and the rate of pollutants emission,is one of the most significant parameters in the operation of these types of systems.Having parametric certainties in the model,a PID control algorithm has been applied to control the bed temperature by input parameters,i.e.coal feed rate and total wind volume.The PID controller can carry out the perfect tracking from output to input.The controller also can set the temperature to our desired range and minimize the influence of the noise to closed-loop system.Finally the influence to bed temperature causing by the input uncertainties and the instability from the internal parameters are summarized.更多还原