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Modeling and Simulation for 440t/h CFB Boiler Air-Flue Gas System

Author: WanLiPeng
Tutor: YangChen
School: Chongqing University
Course: Thermal Power Engineering
Keywords: Circulating fluidized bed Simulation Modular Modeling
CLC: TK229.6
Type: Master's thesis
Year: 2005
Downloads: 232
Quote: 3
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Abstract


Circulating fluidized bed combustion is a highly efficient, low-pollution, fuel adaptability clean coal burning power generation technology in the current case is still coal-fired power generation in the future based circulating fluidized bed coal-fired power generation technology in the domestic external rapid development. The overall dynamic mathematical model developed simulation system using a boiler timely forecasting, analysis and solve the field operation of the boiler, thereby enhancing the security and economy of the boiler. Cyclone is a large circulating fluidized bed boiler system is very important and complex device, the actual run, after the burning of the separator phenomenon is very common, and the dynamic of the existence of the phenomenon of post-combustion boiler system as a whole characteristics have not be ignored. Therefore, their accurate dynamic mathematical model is very necessary. This work is based on the starting point, to 440t / h circulating fluidized bed boiler flue gas system equipment for research object to establish a separate dynamic mathematical model, focusing on the cyclone. Create a mathematical model of the cyclone, according to the actual situation, consider the phenomenon of post-combustion of the separator material, and separator inlet flue gas particulate consider the characteristics of its wide screening. The mathematical model includes a separator model, superheater model, economizer model turbine model (s), pump and valve model. On the basis of the mathematical model, the use of high-level object-oriented programming languages ??(FORTRAN) simulation model, taking into account pathological characteristics of the boiler equipment, model algorithm uses automatic variable order variable step numerical integration algorithm-Gear algorithm , as well as solving the Jacobian matrix Jacobi algorithm. Subsequently, each device simulation step disturbance. The results show that: the dynamic laws of each module is correct and reasonable, the dynamic characteristics of the theoretical analysis results in good agreement; the add modules disturbance state parameter change is reasonable, consistent with the results of theoretical analysis correctly reflects the dynamic characteristics of each device; verified the correctness of the mathematical model established in this paper. Modeling the idea of ??modular modeling, it is established in this paper equipment module has the versatility, openness, reusability and scalability and many other advantages. Therefore, as the power plant engineering analysis part of the emulator, this article COMPAQ Visual Fortran 6.5 as a development tool, the development of a dynamic model of the cyclone and boiler flue gas system equipment module. General equipment module developed in this paper can be better used on-site engineering and process analysis, to favor timely and accurate analysis to solve practical engineering problems.

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CLC: > Industrial Technology > Energy and Power Engineering > Steam Power Engineering > Steam boiler > Various types of boilers > Coal-fired boilers
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