Data-driven Modeling and Self-organizing Control of Municipal Solid Waste Incineration Process
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摘要: 城市固废焚烧(Municipal solid waste incineration, MSWI)是处置城市固废(Municipal solid waste, MSW) 的主要手段之一. 中国MSW来源范围广、组分复杂、热值波动大, 其焚烧过程通常依靠人工干预, 这导致MSWI过程智能化水平较低且难以满足日益提升的控制需求. MSWI具有多变量耦合、工况漂移等诸多不确定性特征, 因而难以建立其被控对象模型并设计在线控制器. 针对以上问题, 提出了一种面向MSWI过程的数据驱动建模与自组织控制方法. 首先, 构建了基于多输入多输出Takagi Sugeno 模糊神经网络(Multi-input multi-output Takagi Sugeno fuzzy neural network, MIMO-TSFNN) 的被控对象模型; 然后, 设计了基于多任务学习的自组织模糊神经网络控制器(Multi-task learning self-organizing fuzzy neural network controller, MTL-SOFNNC)用于同步控制炉膛温度与烟气含氧量, 其通过计算神经元的相似度与多任务学习(Multi-task learning, MTL)能力对控制器结构进行自组织调整; 接着, 通过Lyapunov定理对MTL-SOFNNC稳定性进行了证明; 最后, 通过北京市某MSWI厂的过程数据验证了模型与控制器的有效性.Abstract: Municipal solid waste incineration (MSWI) is one of the main means to dispose of municipal solid waste (MSW). MSW in China has a wide range of sources, complex components, and large fluctuations in calorific value. Its incineration process usually relies on manual intervention. This will lead to a low degree of intelligence in the MSWI process and it is difficult to meet the increasing control requirements. MSWI has many uncertain characteristics such as multivariable coupling and working condition drift, so it is difficult to build the model of controlled object and design the on-line controller. To solve the above problems, this paper proposes a data-driven modeling and self-organizing control method for MSWI process. Firstly, the model of controlled object based on multi-input multi-output Takagi Sugeno fuzzy neural network (MIMO-TSFNN) is constructed. Secondly, a multi-task learning self-organizing fuzzy neural network controller (MTL-SOFNNC) is designed to synchronously control the furnace temperature and flue gas oxygen content, which can self-organize the structural parameters of the controller by calculating the similarity of neurons and the ability of multi-task learning (MTL). Meanwhile, the stability of MTL-SOFNNC is proved by Lyapunov theorem. Finally, the effectiveness of the model and controller is verified by the process data of an MSWI plant in Beijing.
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表 1 实验对象的运行范围
Table 1 Operating range of experimental subjects
变量名 运行范围 单位 一次风总流量 40 ~ 100 km3 N/h 干燥炉排速度百分比 0 ~ 100 % 二次风流量 0 ~ 30 km3 N/h 炉膛温度 850 ~ 1050 ℃ 烟气含氧量 2 ~ 14 % 主蒸汽流量 65 ~ 85 t/h 表 2 被控对象建模效果评价
Table 2 Evaluation of modeling effect of controlled object model
被控模型 评价指标 炉膛温度
模型烟气含氧
量模型主蒸汽
流量模型MIMO-TSFNN 训练 RMSE 3.88 ℃ 0.30% 0.43 t/h APE 0.27% 3.16% 0.45% 测试 RMSE 4.18 ℃ 0.58% 0.49 t/h APE 0.31% 6.97% 0.59% 表 3 MSWI过程多变量控制器性能比较
Table 3 Performance comparison of multi-variable controllers for MSWI process
控制器 神经元个数 炉膛温度 烟气含氧量 IAE ISE $ \bar{\sigma}{\text{%}} $ $\bar{t}_r \;({\rm{s} })$ IAE ISE $ \bar{\sigma} {\text{%}}$ $\bar{t}_r\; ({\rm{s} })$ MTL-SOFNNC 10 1.883 28.828 0.39% 23.93 0.151 0.124 3.12% 21.47 M-DSNNC 21 2.379 29.374 0.58% 25.68 0.188 0.150 3.14% 29.47 SOFC 20 2.464 30.229 0.46% 30.43 0.194 0.152 3.92% 29.37 SOTSFNNC 17 2.872 30.414 0.72% 23.38 0.214 0.136 4.13% 27.72 TSFNNC 20 2.854 30.728 0.75% 24.14 0.217 0.151 5.45% 34.77 -
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