超超临界二次再热机组汽温控制策略研究

发布时间：2018-05-07 03:32

本文选题：超超临界 + 二次再热　；参考：《华北电力大学》2014年硕士论文

【摘要】：由于超超临界二次再热机组具有良好的经济效益和环保效益，，在现有的材料技术和热工控制水平的基础上发展超超临界二次再热机组将是我国今后高参数、大容量火电机组的发展趋势。二次再热机组由于其锅炉构造的复杂性及特殊性，如何实现主汽温和两个再热汽温的有效控制是亟待解决的问题。本文在分析国外现有二次再热机组汽温控制方法的基础上，针对二次再热塔式炉的受热面布置特点及设计参数，设计了一套针对超超临界二次再热机组的汽温控制方案。主汽温的控制主要由燃水比和过热器喷水减温完成；两个再热汽温主要由燃烧器摆角和烟气挡板调节，喷水减温作为事故及紧急情况下的调温手段。考虑到燃烧器摆动对主汽温的影响，将燃烧器摆角的变化作为前馈信号叠加到过热器喷水控制回路中。对于再热汽温的控制，本控制方案采用了偏差调节的方法，其中燃烧器摆角按照再热汽温实际值与设定值之间较大的偏差进行调节；烟气挡板用来调节两个再热汽温的偏差，使两个再热汽温偏差趋于相同。燃烧器摆角与烟气挡板的协调动作可以保证再热汽温的基本稳定，这同时也解决了燃烧器摆角和烟气挡板同时控制再热汽温时两者之间相互匹配的问题。本文的设计组态均是在国电智深DCS上完成的。最后通过在超超临界二次再热机组激励式仿真机上进行仿真试验，验证了汽温控制策略的控制效果。通过本文的研究分析，能够对超超临界二次再热机组汽温控制的实际应用有一定的借鉴意义。
[Abstract]:As the super supercritical two reheat unit has good economic and environmental benefits, the development of super supercritical two reheat unit on the basis of existing material technology and thermal control level will be the development trend of high parameter and large capacity thermal power unit in the future. The two reheat unit is complicated and special because of its boiler structure. Therefore, how to realize the effective control of the main steam and two reheated steam temperatures is an urgent problem.
Based on the analysis of the steam temperature control methods for two reheat reheat units abroad, this paper designs a set of steam temperature control scheme for the ultra supercritical two reheat unit, aiming at the layout characteristics and design parameters of the two reheat tower furnace. The control of the main steam temperature is mainly done by the ratio of water to the burning water and the temperature reduction of the superheater water spray; two reheat reheat. The steam temperature mainly consists of the burner swing angle and the flue gas baffle adjustment and the water spray temperature reduction as the temperature adjustment means in the accident and emergency. Considering the effect of the burner swing on the main steam temperature, the change of the burner's swing angle is superimposed on the superheater spray control loop as the feedforward signal. The adjustment method, in which the burner angle is adjusted according to the larger deviation between the actual value of reheated steam temperature and the set value, the flue gas baffle is used to adjust the deviation of the two reheated steam temperatures, so that the two reheated steam temperature deviations tend to be the same. The coordination action of the burner angle and the flue gas baffle can ensure the basic stability of the reheated steam temperature. The matching problem between the burner swing angle and the flue gas baffle at the same time controlling the reheated steam temperature is also solved.
The design configuration of this paper is completed on the national DCS. Finally, the control effect of the steam temperature control strategy is verified by the simulation test on the exciting simulator of the ultra supercritical two reheat unit.
The research and analysis in this paper can be used for reference in the practical application of steam temperature control for ultra supercritical two reheat units.

【学位授予单位】：华北电力大学
【学位级别】：硕士
【学位授予年份】：2014
【分类号】：TM621.6

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