Simulation and Performance Reliability of Boiler Load Raising Process Considering Leakage of Feed Water

doi:10.16183/j.cnki.jsjtu.2020.033

Abstract

Abstract:

In response to the problems of boiler low water level and pump cavitation caused by the leakage of feedwater unloading pipeline in the process of boiler load raising of the conventional steam power system, the relational model of water-lift, mass flow, revs of booster pump, and each impeller of the feedwater pump are identified by using a differential evolution algorithm based on residual correction. The relational model of mass flow and resistance of feedwater pipelines and valves, the calculational model of working fluid parameters in feedwater system, and the performance degradation model of feedwater unloading control valve are established by using be mechanism modeling method. On this basis, the process of boiler load raising is simulated, and the main parameters of feedwater system are obtained at different feedwater unloading flow rates. It is found that the performance degradation of the control valve of the feedwater unloading pipeline is one of the main causes for boiler water low level and pump cavitation in the process of boiler load raising. In order to further clarify the degradation rule of the performance reliability of the feedwater system with the working time, a simulation method integrating the mathematical model and Monte Carlo random sampling is adopted to the performance reliability simulation of a certain type of marine water supply system in the process of boiler load raising. Thus the whole performance reliability changes of this boiler and the performance reliability life of this feedwater unloading control valve are obtained. The research results reveal the mechanism and degeneration rule of a unique fault of the steam power system, which has certain theoretical and engineering application value.

Key words: boiler load raising process, feedwater leakage, simulation, performance reliability

CLC Number:

NI He, QIN Haibo, ZHENG Yiyang. Simulation and Performance Reliability of Boiler Load Raising Process Considering Leakage of Feed Water[J]. Journal of Shanghai Jiao Tong University, 2021, 55(4): 444-454.

Figures/Tables 10

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References 16

[1]	王挺, 吴文辉, 措姆, 等. 核电常规岛给水除氧器水位控制系统建模与仿真[J]. 电网与清洁能源, 2011, 27(7):70-72.
	WANG Ting, WU Wenhui, CUO Mu, et al. Modeling and simulation of tuning adjustment on the control system for the water level in the water feeder deaerator of the conventional island[J]. Power System and Clean Energy, 2011, 27(7):70-72.
[2]	彭明民, 管晓纳, 李浩杰, 等. 浮动核电站给水系统瞬态分析[J]. 核科学与技术, 2017, 5(3):185-193.
	PENG Mingmin, GUAN Xiaona, LI Haojie, et al. Anlysis on transient working conditions for main water feeding system of floating nuclear power[J]. Nuclear Science and Technology, 2017, 5(3):185-193.
[3]	SZAPAJKO G, RUSINOWSKI H, MILEJSKI A. Mathematical model of the steam-water cycle for CHP unit with bleed-condensing turbine[C]//Proceedings of the 13th International Carpathian Control Conference (ICCC). High Tatras, Slovakia: IEEE, 2012: 694-698.
[4]	KAJAL S. Simulation modelling of condensate and feed water system in national thermal power plant[J]. Journal of Mathematical Modelling and Application, 2013, 1(8):68-77.
[5]	成守宇, 彭敏俊, 薛若军, 等. 基于Topmeret的核电厂凝给水系统仿真研究[C]//第二届中国指挥控制大会论文集. 北京. 2014: 395-399.
	CHENG Shouyu, PENG Mingjun, XUE Ruojun, et al. Study on dynamic simulation of condenser water and feed water system of nuclear power plants based on Topmeret[C]//Proceedings of the 2^nd China Conference on Command and Control. Beijing, 2014: 395-399.
[6]	孙雅慧. 船舶动力系统汽水管网热力水力特性研究及优化设计[D]. 哈尔滨: 哈尔滨工程大学, 2015.
	SUN Yahui. Thermal-hydraulic characteristics research and optimal design of steam-water pipe network in marine propel system[D]. Harbin: Harbin Engineering University, 2015.
[7]	覃海波, 金家善, 倪何. 考虑高温水泄漏影响的凝水泵启动过程仿真分析[J]. 哈尔滨工业大学学报, 2020, 52(1):118-125.
	QIN Haibo, JIN Jiashan, NI He. Simulation analysis on startup period of condensate pump considering impact of high temperature water leaking[J]. Journal of Harbin Institute of Technology, 2020, 52(1):118-125.
[8]	周红. 核动力装置凝给水系统协调控制方法研究[D]. 哈尔滨: 哈尔滨工程大学, 2009.
	ZHOU Hong. Research on the coordinated control method of condensate and feed water system in nuclear power system[D]. Harbin: Harbin Engineering University, 2009.
[9]	张勇, 陈钢, 高世超, 等. 系统仿真平台SimuWorks应用[M]. 北京: 科学技术文献出版社, 2016.
	ZHANG Yong, CHEN Gang, GAO Shichao, et al. Application of system simulation platform SimuWorks [M]. Beijing: Scientific and Technical Documentation Press, 2016.
[10]	倪何, 肖航, 曾凡明, 等. 基于残差修正的涡轮增压机组差异演化建模与降负荷特性分析[J]. 上海交通大学学报, 2015, 49(5):620-625.
	NI He, XIAO Hang, ZENG Fanming, et al. Differential evolutionary modeling with residual correction and down-load characteristic analysis for marine turbocharged unit[J]. Journal of Shanghai Jiao Tong University, 2015, 49(5):620-625.
[11]	覃海波, 倪何, 金家善. 基于残差修正的离心泵差异演化建模与汽蚀特性[J]. 哈尔滨工程大学学报, 2019, 40(2):298-303.
	QIN Haibo, NI He, JIN Jiashan. Differential evolutionary modeling with residual correction and cavitation characteristics analysis of a centrifugal pump[J]. Journal of Harbin Engineering University, 2019, 40(2):298-303.
[12]	倪何, 覃海波, 金家善, 等. 基于差异演化和残差修正的离心泵特性辨识与汽蚀分析[J]. 上海交通大学学报, 2018, 52(7):831-836.
	NI He, QIN Haibo, JIN Jiashan, et al. Characteristic identification and cavitation analysis of centrifugal pump based on differential evolution algorithm with residual correction[J]. Journal of Shanghai Jiao Tong University, 2018, 52(7):831-836.
[13]	黄文元, 金家善, 倪何. 基于差异演化算法和残差修正的涡轮增压机组防喘振控制[J]. 中国舰船研究, 2016, 11(5):100-106.
	HUANG Wenyuan, JIN Jiashan, NI He. Active surge control of marine turbocharged units based on differential evolutionary modeling with residual correction[J]. Chinese Journal of Ship Research, 2016, 11(5):100-106.
[14]	POZRIKIDIS C. Fluid dynamics: Theory, computation and numerical simulation[M]. New York, USA: Springer, 2013.
[15]	潘灵永, 王向旗, 李宝仁, 等. 基于阀门开度的水下闸阀摩擦力负载模型研究[J]. 华中科技大学学报(自然科学版), 2015, 43(10):6-9.
	PAN Lingyong, WANG Xiangqi, LI Baoren, et al. Study on frictional load model based on subsea gate valve opening[J]. Journal of Huazhong University of Science and Technology (Natural Science Edition), 2015, 43(10):6-9.
[16]	阎昌琪. 气液两相流[M]. 哈尔滨: 哈尔滨工程大学出版社, 2007.
	YAN Changqi. Gas-liquid two-phase flow[M]. Harbin: Harbin Engineering University Press, 2007.

t/τ	仅增压泵汽蚀	仅锅炉失水	仅增压泵汽蚀和锅炉失水,给水泵不汽蚀	仅给水泵汽蚀和锅炉失水,增压泵不汽蚀	三者同时出现
0~17	0	0	0	0	0
18	3	2	6	0	0
20	19	8	38	0	0
22	35	90	135	0	0
24	22	166	240	6	20
26	15	238	321	18	89
28	2	216	422	42	128
30	0	132	315	22	415
32	0	48	170	12	694