锅炉排烟余热利用计算及在线优化软件设计

发布时间：2018-03-12 09:54

本文选题：模块化　切入点：低温省煤器　出处：《天津大学》2016年硕士论文　论文类型：学位论文

【摘要】：近些年来,为了节约能源,保护环境,人们开始比以往更关注能源的利用问题。因此,大力发展可再生能源和对现有的能源进行充分利用已经成为世界各国关注的焦点问题。电力锅炉发电厂是以朗肯循环为基础进行热功转换获得电能的,在获取能源的同时,也存在着较大的热量损失。而这其中锅炉烟气的排热损失就是主要热量损失源之一。采用低温省煤器改造回收锅炉排放的排烟余热是目前较为成熟可靠的锅炉排烟余热利用方式。低温省煤器系统的改造的关键在于与回热系统的连接和运行温度的控制。在低温省煤器的传统设计过程中,存在着大量重复的人工操作,回热系统连接设计以及温度控制的设计参数优化选择过程,需要反复对机组整体热效率进行多次计算,传统方法耗时费力。通过开发一套针对低温省煤器系统的锅炉排烟余热利用计算软件,不仅可以极大的减少重复的人工操作,节省人力,避免人工查图查表的误差,还可以利用设计过程中形成的计算模型,指导低温省煤器运行参数的选定,使得低温省煤器系统得到更高的节能效果。锅炉排烟余热利用计算软件采用模块化设计,热力计算、换热器设计、管道设计、工质参数设计等模块功能分离,通过重新组合、补充功能,可用于其它烟气换热装置或各类环保、节能装置的设计优化。机组热效率计算采用等效焓降法计算,相比于正反平衡法等算法,节省了计算资源,减少了对数据采集的需求。计算所需参数更易获得,计算出来的结果也更为直观。针对不同机组测点位置不同、效率算法不同的问题,在线效率计算采用图形化组态二次计算方式。测点故障、机组变工况、改造等情况发生时,只需及进行重新组态,不需重新编译,不需专门人员培训。
[Abstract]:In recent years, in order to save energy and protect the environment, people begin to pay more attention to the use of energy than ever before. The development of renewable energy and the full utilization of existing energy have become the focus of attention in the world. Power boiler power plants are based on the Rankine cycle for thermal power conversion to obtain electricity, while obtaining energy, The heat loss of boiler flue gas is one of the main sources of heat loss. It is more mature and reliable to use low temperature economizer to transform the waste heat of exhaust gas from the recovery boiler. The key to the transformation of low temperature economizer system lies in the connection with the regenerative system and the control of operating temperature. In the traditional design process of low temperature economizer, There are a lot of repeated manual operation, connection design of regenerative system and optimum selection of design parameters of temperature control, so it is necessary to repeatedly calculate the overall thermal efficiency of the unit. The traditional method is time-consuming and laborious. By developing a set of calculation software for boiler exhaust heat utilization of low temperature economizer system, not only the repeated manual operation can be greatly reduced, but also the manpower can be saved, and the error of manually checking the chart and table can be avoided. The calculation model formed in the design process can also be used to guide the selection of the operating parameters of the cryogenic economizer, so that the cryogenic economizer system can obtain higher energy saving effect. The calculation software for waste heat utilization of boiler exhaust gas is modular design and thermal calculation. Heat exchanger design, pipe design, working fluid parameter design and other modules function separation, through re-assembly, supplementary functions, can be used in other flue gas heat transfer devices or all kinds of environmental protection, The design optimization of energy-saving device. The equivalent enthalpy drop method is used to calculate the thermal efficiency of the unit. Compared with the positive and negative balance method, the calculation resources are saved and the demand for data acquisition is reduced. The calculated results are also more intuitionistic. In view of the problem of different measuring points and different efficiency algorithms of different units, the on-line efficiency calculation adopts the secondary calculation method of graphical configuration, when the fault of measuring points, the variable working conditions of the units, the transformation of the units, and so on, occur. Only reconfiguration, no recompilation, no professional training.
【学位授予单位】：天津大学
【学位级别】：硕士
【学位授予年份】：2016
【分类号】：TM621.2;TK115;TP311.52

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