Start-Up and dynamic processes simulation of supercritical once-through boiler

Deng, Kangjie; Yang, Chen; Chen, Hao; Zhou, Nana; Huang, Sheng-Jie

doi:10.1016/j.applthermaleng.2017.01.016

Cited by 38 publications

(14 citation statements)

References 18 publications

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“…In each model instance, the flow, M, through the stage is calculated by Equation 2, where the flow parameter C flow is designed for the nominal load. The efficiency, η is , of the leading stage is then calculated using Equations (3) and (4). The equations used for this model are adapted from the work of Liese [27].…”

Section: Leading Stagementioning

confidence: 99%

“…Therefore, due to the pathways of the flue gas and the BFW/steam, all boiler components and some upstream and downstream components must be simulated together. A dynamic model of a 600 MW supercritical plant was developed and used for studying start-up and dynamic behavior [4]. This model included the economizer, superheater, water circulation pump, and water storage tank.…”

Section: Introductionmentioning

confidence: 99%

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Development of a Dynamic Model and Control System for Load-Following Studies of Supercritical Pulverized Coal Power Plants

et al. 2018

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Traditional energy production plants are increasingly forced to cycle their load and operate under low-load conditions in response to growth in intermittent renewable generation. A plant-wide dynamic model of a supercritical pulverized coal (SCPC) power plant has been developed in the Aspen Plus Dynamics® (APD) software environment and the impact of advanced control strategies on the transient responses of the key variables to load-following operation and disturbances can be studied. Models of various key unit operations, such as the steam turbine, are developed in Aspen Custom Modeler® (ACM) and integrated in the APD environment. A coordinated control system (CCS) is developed above the regulatory control layer. Three control configurations are evaluated for the control of the main steam; the reheat steam temperature is also controlled. For studying servo control performance of the CCS, the load is decreased from 100% to 40% at a ramp rate of 3% load per min. The impact of a disturbance due to a change in the coal feed composition is also studied. The CCS is found to yield satisfactory performance for both servo control and disturbance rejection.

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Section: Leading Stagementioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Development of a Dynamic Model and Control System for Load-Following Studies of Supercritical Pulverized Coal Power Plants

et al. 2018

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“…Modeling is the prerequisite for control. Some models are accurate but too complex for control design [11][12][13][14]. Some models have low precision while can reflect the main dynamic characteristics of the system.…”

Section: Introductionmentioning

confidence: 99%

Compensation Design of Coordinated Control System for Supercritical Once-Through CHP Plants Based on Energy Analysis

et al. 2021

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To increase the flexibility of power generation, the supercritical once-through boiler combined heat and power (CHP) plant should improve its coordinated control system (CCS). The difficulty of CCS for supercritical once-through boiler unit is to determine the water-fuel ratio in the dynamic process. First, a CHP unit model is established and simplified into a three-input three-output object under pure condensing working conditions. Second, dynamic relative matrix gain method and simulation is used to analysis several once-through boiler coordinated control schemes commonly used in engineering in which the compensation link is designed on the basis of water-fuel ratio. Simulation results show that, the water following CCS scheme has better intermediate point temperature performance and worse throttle pressure performance than the fuel following CCS scheme. To improve pressure performance, the closed-loop characteristics of pressure response to fuel and feed water flow are analyzed and compared through wavelet analysis. Finally, a method for determining the inertia time constant in the dynamic compensation link by comparing the wavelet coefficients is proposed. Wavelet analysis show that the imbalance in the speed of energy changes to fuel and feed water flow is the essential cause of large fluctuations in intermediate point temperature and throttle pressure before turbine of the supercritical once-through boiler unit. Simulation results show that using the proposed dynamic compensation in water following CCS can effectively reduce fluctuations of the intermediate point temperature and fluctuations of throttle pressure before turbine when power load command changes.

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“…In black‐box modeling, the coordinated control systems were modeled through fuzzy‐modeling or neural modeling 14,15 to prepare for optimized controllers. Developed by an advanced process simulation software, APROS, the dynamic simulation models 16 can simulate the dynamic behavior of the real power plant with a high accuracy, even at very low loads 17 . These simulated models have the advantages of higher accuracy but their complexity disables them from being used for CCS directly.…”

Section: Introductionmentioning

confidence: 99%

The control‐oriented model of coordinated control system based on stochastic differential equations

Niu

et al. 2020

Energy Science & Engineering

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Considering the large‐scale development of renewable energy resources globally, control optimization of coal‐fired power plants is becoming increasingly crucial. The dynamics of the coordinated control system (CCS) must be studied prior to designing a controller. These dynamics of the subcritical units have been expressed through various modeling methods. However, in previous studies, ordinary differential equations (ODEs) have been primarily employed, which cannot reflect the uncertainties in the system. Therefore, a model with a greater accuracy should be observed to comprise uncorrelated residuals. In this study, the uncertainties in the calorific value of fired coal and combustion process were analyzed first. A normal distribution of disturbance was assumed in this process. The dynamics of the CCS were then described with stochastic differential equations (SDEs). Furthermore, a parameter estimation procedure was designed. The residual evaluation is employed to improve the model evaluation. After simulations, the SDE‐based model‐3 in this study elucidates the dynamics of the subcritical boiler‐turbine system better than the ODE‐based model and other SDE‐based models. The measured values can be regarded as a possible result of this model, rendering it a potential platform to employ stochastic model predictive control in CCS.

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Start-Up and dynamic processes simulation of supercritical once-through boiler

Cited by 38 publications

References 18 publications

Development of a Dynamic Model and Control System for Load-Following Studies of Supercritical Pulverized Coal Power Plants

Development of a Dynamic Model and Control System for Load-Following Studies of Supercritical Pulverized Coal Power Plants

Compensation Design of Coordinated Control System for Supercritical Once-Through CHP Plants Based on Energy Analysis

The control‐oriented model of coordinated control system based on stochastic differential equations

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