Development and Validation of a Dynamic Flowsheet Model for a 350 MWe Supercritical Circulating Fluidized Bed Boiler

EngRN: Heat Transfer (Topic) Pub Date : 1900-01-01 DOI:10.2139/ssrn.3933569

Shahong Zhu, Man Zhang, Boyu Deng, Zhong Huang, Yi Ding, Gang Wang, Hairui Yang, G. Yue

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引用次数: 1

Abstract

The circulating fluidized bed (CFB) boiler is highly recommended in peak shaving for its wide load regulating range compared with the pulverized coal (PC) boiler. However, the research on dynamic flowsheet model of the CFB boiler is quite limited due to its complex flow regime. In this paper, both steady state and d ynamic flowsheet model of a supercritical 350 MWe CFB boiler was developed based on Aspen Plus and Aspen Dynamics software coupled with comprehensively user defined combustion kinetics and heat transfer coefficient with FORTRAN subroutines. This model was then validated by the operating data of the 350 MWe supercritical CFB boiler. Based on this model, the dynamic characteristics of three typical step signal disturbances, coal flow rate, primary flow rate and secondary air flow rate, were further analyzed to provide theoretical references to dynamic operation. Also, the quantitative relation between the stabilization time and step signal amplitude was calculated. Above all, this dynamic flowsheet model can not only be used to conduct dynamic behavior prediction and analysis but also provide transfer functions to the further development of CFB automatic control system.

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350mwe超临界循环流化床锅炉动态流程模型的建立与验证

与煤粉锅炉相比，循环流化床锅炉具有较大的负荷调节范围，因此在调峰时被大力推荐。然而，由于循环流化床锅炉流动形式复杂，对其动态流程模型的研究相当有限。基于Aspen Plus和Aspen Dynamics软件，结合用户自定义的燃烧动力学和传热系数以及FORTRAN子程序，建立了超临界350mwe循环流化床锅炉稳态和动态流程模型。并通过350mwe超临界循环流化床锅炉的运行数据对该模型进行了验证。在此模型的基础上，进一步分析了煤流量、一次风流量和二次风流量三种典型阶跃信号扰动的动态特性，为动态运行提供理论参考。并计算了稳定时间与阶跃信号幅值之间的定量关系。综上所述，该动态流程模型不仅可以用于循环流化床自动控制系统的动态行为预测和分析，还可以为循环流化床自动控制系统的进一步开发提供传递函数。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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EngRN: Heat Transfer (Topic)

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