达拉特发电厂330MW机组低低温省煤器节能研究

发布时间：2018-05-22 09:20

本文选题：330MW机组 + 锅炉尾部烟气温度　；参考：《华北电力大学》2017年硕士论文

【摘要】：低低温省煤器技术是在现阶段电站锅炉尾部烟气热量回收、节能利用的一项技术,针对当前电厂锅炉的排烟温度过高的问题,这项技术便成为近年来发电厂有效降低锅炉排烟温度的一项很实用的方法。本文在前人研究的基础上,依据热平衡原理建立低低温省煤器优化设计模型,利用计算机编程来计算、优化,得到最优的设备参数。通过分析比较,选取低低温省煤器在烟气侧最优的布置位置及在水侧最优的连接方式。结合实际发电厂的工程项目,依据等效焓降法及余热利用理念,计算应用低低温省煤器后系统的热经济性指标。首先,考虑到低低温省煤器处在低温环境,经过对耐腐蚀材料和管型传热性能的分析和比较,得到了合适的管材和管型。选取低低温省煤器管相关参量作为决策变量,通过热平衡理论进行传热计算,设定相关约束条件,假设低低温省煤器出口烟气温度为变量,建立低低温省煤器的优化设计模型,经过程序计算和优化后得出最优结果。其次,结合达拉特发电厂330MW机组的实际工程,选取低低温省煤器在锅炉尾部最合理的布置方式。由煤种特性计算出烟气露点温度,控制低低温省煤器入口凝结水的温度,避免低温腐蚀的影响。对其水侧串并联系统进行热力分析,选取最优的串并联方式。通过低低温省煤器优化设计和相关参量确定后,利用等效焓降法及余热利用理念,分析加装低低温省煤器后的热力系统,计算标准煤耗量、煤耗率、机组热效率等热经济性指标。
[Abstract]:Low and low temperature economizer technology is a technology for heat recovery and energy saving of flue gas from the tail of power plant boiler at the present stage. Aiming at the problem of excessive exhaust gas temperature of power plant boiler at present, This technique has become a practical method for reducing boiler exhaust gas temperature in power plants in recent years. In this paper, based on the previous research, the optimal design model of low temperature economizer is established according to the principle of heat balance, and the optimum equipment parameters are obtained by computer programming. Through analysis and comparison, the optimal arrangement position of low temperature economizer on the flue gas side and the optimal connection mode on the water side are selected. Based on the equivalent enthalpy drop method and the idea of waste heat utilization, the thermal economic indexes of the system after the application of low temperature economizer are calculated. Firstly, considering that the low temperature economizer is in the low temperature environment, through the analysis and comparison of the corrosion resistant material and the heat transfer performance of the tube type, the appropriate pipe and tube type are obtained. The parameters related to the tube of low temperature economizer are selected as decision variables. The heat transfer calculation is carried out through the theory of heat balance. The relevant constraint conditions are set up, and the optimal design model of low temperature economizer is established, assuming that the flue gas temperature at the outlet of low temperature economizer is a variable. The optimal results are obtained by program calculation and optimization. Secondly, combined with the practical project of 330MW unit in Dharat Power Plant, the most reasonable arrangement of low temperature economizer in boiler tail is selected. The dew point temperature of flue gas is calculated according to the characteristics of coal, and the temperature of condensate at the inlet of low temperature economizer is controlled to avoid the influence of low temperature corrosion. The thermodynamic analysis of the water side series-parallel system is carried out, and the optimal series-parallel mode is selected. After optimized design of low temperature economizer and determination of relevant parameters, the thermodynamic system after installing low temperature economizer is analyzed by using equivalent enthalpy drop method and waste heat utilization concept, and standard coal consumption and coal consumption rate are calculated. Unit thermal efficiency and other thermal economic indicators.
【学位授予单位】：华北电力大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：TM621

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