三塔合一间接空冷塔优化研究

发布时间：2018-04-06 22:36

本文选题：烟塔合一　切入点：三塔合一　出处：《华北电力大学》2017年硕士论文

【摘要】：随着烟塔合一技术的成熟应用,在其基础上出现了三塔合一技术,即将脱硫塔内置于空冷塔内,由烟塔合一改为三塔合一。三塔合一技术具有节能降耗和减轻环境污染效益。在节能减排的形式下,三塔合一技术将在火电行业得到广泛应用。三塔合一结构中排烟在塔内与热气体之间的混合和热交换以及塔内布置的脱硫塔和烟囱会影响塔内气体流动,使流场更加复杂,换热特性的影响因素更加复杂。散热器的布置方式、塔内排放的高温高速烟气、脱硫塔、烟囱以及塔型参数等因素均不同程度地影响换热特性。全面的研究分析各个因素对换热特性的影响规律,并探究出各个因素影响下的最优换热特性,为三塔合一结构的优化运行提供参考。以某600MW三塔合一间接空冷机组为研究对象,首先建立三维数值计算模型,并利用相应的实测数据验证了所建立数值模型的正确性。其次以此模型为基础,对比研究了不同环境风速下散热器塔外垂直布置和塔内水平布置时三塔合一间接空冷塔和常规间接空冷塔的流场和换热特性的差异,以及散热器布置方式对三塔合一间接空冷塔的换热特性的影响。最后分别以三塔合一间接空冷塔的塔内排烟参数、脱硫塔和烟囱的结构参数以及空冷塔的塔型参数为单一变量,对不同变量取值的模型进行模拟计算,选取适当的评价指标,探究各个变量对换热特性的影响规律及影响程度。研究结果表明:无环境风工况下,每一种散热器布置方式的两种结构的换热特性差异不大;存在环境风时,随着环境风速的增大,每一种散热器布置方式的两种结构的换热特性差异逐渐变大;在整个模拟的环境风速范围内,三塔合一间接空冷塔的换热特性始终好于常规间接空冷塔的换热特性,散热器塔外垂直布置时的换热特性好于塔内水平布置时的换热特性。排烟温度、排烟速度、排烟流量、烟囱高度和烟囱直径等参数的改变对换热特性的影响并不大;随着脱硫塔直径的变大,换热特性继续减弱;随着出口直径或喉部直径的变大,换热特性先增强再减弱;无环境风工况下,随着喉部高度的变大,换热特性先增强再减弱,而有环境风时变化与之相反;随着塔高度的变大,换热特性持续增强;当出口直径与零米直径的比值R1/R2=0.8~0.85,喉部直径与零米直径的比值R0/R2=0.6~0.65时,换热特性最优。
[Abstract]:With the mature application of one tower, on the basis of the three in one technology, will be built in the desulfurization tower of air cooling tower, the smoke tower one to three one. Three in one technology with energy saving and reducing environmental pollution benefits. Energy saving and emission reduction in the form of a three. Technology will be widely used in thermal power industry. Three combined structure between the exhaust tower and hot gas mixing and heat exchange and internal layout of the desulfurization tower and chimney tower will affect the gas flow, the flow field is more complex, factors affecting the heat transfer characteristics are more complicated. The layout of the radiator, high temperature flue gas. The emission of the desulfurization tower, chimney and tower type parameters and other factors have different degrees of influence on heat transfer characteristics. Influence of comprehensive study on the thermal characteristics analysis of various factors on the exchange, and explore the various factors under the influence of the Excellent heat transfer characteristics, provide a reference for the optimization operation of a tower structure. With a 600MW three one indirect air-cooled unit as the research object, firstly established the three-dimensional numerical calculation model, and the corresponding measured data to verify the correctness of the numerical model. Then this model as the foundation, comparative study of different the wind speed difference flow radiator outside tower vertical layout and layout of three tower level one indirect air cooling tower and conventional indirect air cooling tower and heat transfer, and radiator arrangement on the tower one indirect air cooling tower heat transfer effect. Finally, three one indirect air cooling tower the exhaust tower parameters, structure parameters of the desulphurization tower and chimney type air cooling tower and tower parameters for a single variable, the different variable model simulation, selecting appropriate evaluation indexes, to explore the variable The influence and impact on the amount of thermal characteristics. The results show that under the condition of no wind, there was a slight difference between the heat transfer characteristics of two kinds of structure of each radiator arrangement; environmental wind, with the increase of wind speed, heat transfer characteristics between two kinds of structure of each radiator. Gradually increased; in the environment of the whole simulation range of wind speed, the heat transfer characteristics of the heat transfer characteristics of three in one indirect air cooling tower is always better than the conventional indirect air cooling tower, the heat transfer characteristics of radiator outside tower vertical arrangement of heat transfer characteristics in horizontal tower. When the exhaust gas temperature and exhaust velocity. The smoke flow, influence of thermal properties change on the chimney height and diameter of the chimney and other parameters are not; with the desulfurization tower diameter becomes larger, the heat transfer characteristics as exports continue to weaken; the diameter or throat diameter becomes larger, the heat transfer characteristics of first increasing and then Weakened; no environmental air condition, with the throat height increases, the heat transfer characteristics of first increased and then decreased, and the environmental wind changes the opposite; with the tower height increases, the heat transfer characteristics continue to increase; when the ratio of R1/R2=0.8~0.85 and zero exit diameter meter diameter, throat diameter and the ratio of R0/R2=0.6~0.65 zero meters in diameter, the optimal heat transfer characteristics.

【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

【参考文献】