1000MW火电机组吸收塔脱硫泵设计与理论研究

发布时间：2018-05-28 07:56

本文选题：吸收塔脱硫泵 + 设计方法　；参考：《江苏大学》2014年博士论文

【摘要】：本课题是国家科技支撑计划项目“典型离心泵关键技术研究及工程示范应用”课题(项目编号：2011BAF14800)及江苏省科技支撑(工业)计划项目“火电厂大型系列烟气脱硫吸收塔循环泵关键技术开发与应用”课题(项目编号：BE2011141)的主要研究内容之一。火电机组吸收塔脱硫泵广泛地应用于火电厂、石油、化工等重要行业,火电机组吸收塔脱硫泵的开发及推广应用,对减少火电厂排放的二氧化硫污染,治理环境具有重要的现实意义及显著的经济和社会效益。因此,对火电机组吸收塔脱硫泵的设计方法与理论进行研究,从泵内部流场进行分析,旨在开发出高效的水力模型,提出创新结构设计方案,提高机组的效率及运行的可靠性,为吸收塔脱硫泵优化设计提供依据。主要研究工作及创造性成果有： (1)从设计理论、试验研究、数值仿真计算和综合研究等方面概括论述了目前国内外液固两相流理论与液固两相流泵的研究现状,对叶片机械数值模拟方法研究进行了简要介绍,分析了火电机组吸收塔脱硫泵的发展及趋势。对数值模拟计算所涉及到的不可压缩的粘性流体的纳维-斯托克斯方程进行了分析,研究并选择了模拟计算所需要的数学模型。 (2)借助液固两相流泵的设计理论对火电机组吸收塔脱硫泵的设计方法进行了探讨,借鉴速度系数法对2种规格火电机组吸收塔脱硫泵产品进行了创新设计。引入了基于贝塞尔曲线的叶片极大扭曲结构设计方法,极大扭曲叶片减少了能量损失,提高了泵的水力性能；叶轮进口处叶片超长延伸的设计方法提高了泵的效率,降低了运行成本；设计的叶轮背叶片有效平衡了轴向力；脱硫泵的叶轮和泵体之间设计了自动补偿叶轮间隙的装置及叶轮轴向位移调节装置,保证了泵在高效区运行。 (3)对TLB600-700型脱硫泵分别进行了以清水为介质的单相流场、以含有石灰石颗粒的溶液为介质的液固两相流场的数值模拟。结果表明,泵内流场的流动规律比较好,验证了水力设计方案的可行性,并预测了输送清水时泵的外特性曲线。分析了输送液固两相流时,颗粒物参数对泵性能的影响,对脱硫泵的主要过流部件进行了分析,预测了叶轮及压水室的主要磨损位置。通过三维非定常数值模拟计算,初步揭示了TLB600-700型脱硫泵内部三维流场由于旋转的叶轮和压水室之间的动静干涉作用引起的压力脉动特性。 (4)采用ANASYS软件对2种规格火电机组吸收塔脱硫泵的叶轮进行了流固耦合分析,揭示了脱硫泵叶轮上应力分布密集的区域出现位置,以及叶轮上的变形量最大的位置和形变分布情况。最后,对2种规格火电机组吸收塔脱硫泵样机进行了外特性测试,试验结果表明,采用创新方法设计的2种规格脱硫泵样机设计合理,设计方法可靠,高效率区较宽,额定点效率比国家标准分别提高了3.78个百分点和4.15个百分点。 (5)将数值模拟结果与试验结果进行了对比分析,结果表明数值模拟比较准确地反应了泵内流场的流动情况,证明通过试验与数值模拟结合的方法提高火电机组吸收塔脱硫泵效率的可行性,为火电机组吸收塔脱硫泵系列产品的设计开发与理论研究提供了技术支持,大幅度缩短了设计周期,简化了理论计算的繁琐过程。
[Abstract]:This project is the subject of national science and technology support program "key technology research and engineering demonstration application of typical centrifugal pump" (project number: 2011BAF14800) and Jiangsu science and technology support (industry) project "development and application of key technology of circulating pump for large series flue gas desulfurization absorption tower of thermal power plant" (project number: BE2011141) One of the main contents of the study.
The desulfurization pump of the absorption tower of thermal power unit is widely used in the important industries, such as thermal power plant, oil and chemical industry, and the development and application of desulfurization pump for the absorption tower of thermal power unit. It has important practical significance and remarkable economic and social benefit to reduce the pollution of sulfur dioxide emitted by thermal power plants and control the environment. Therefore, desulfurization of the absorption tower of thermal power unit The design method and theory of the pump are studied. From the flow field of the pump, an efficient hydraulic model is developed and an innovative design scheme is proposed to improve the efficiency of the unit and the reliability of the operation. The main research work and creative achievements are as follows:
(1) from the aspects of design theory, experimental research, numerical simulation calculation and comprehensive research, the current research status of liquid solid two-phase flow theory and liquid solid two phase flow pump at home and abroad is summarized, and the research on the numerical simulation method of blade mechanical simulation is briefly introduced, and the development and trend of the desulfurization pump of the absorption tower of the fire motor group are analyzed. The Navier Stokes equation of the incompressible viscous fluid involved in the calculation is analyzed, and the mathematical model needed for the simulation calculation is studied and chosen.
(2) by means of the design theory of liquid solid two phase flow pump, the design method of the desulfurization pump for the absorption tower of the thermal power unit is discussed. By using the speed coefficient method, the product of the desulfurization pump of the absorption tower of the 2 kinds of thermal power units is innovating. The design method of the maximum twisted blade structure based on the Bessel curve is introduced, and the greatly twisted blade reduces the energy. The hydraulic performance of the pump is improved. The design method of the blade's ultra long extension at the inlet of the impeller improves the efficiency of the pump and reduces the operating cost. The designed impeller back blade is effective in balancing the axial force; the impeller and the pump body of the desulfurization pump are designed to automatically compensate the clearance of the impeller and the axial displacement regulating device of the impeller. It is proved that the pump runs in the high efficiency area.
(3) the single phase flow field of TLB600-700 type desulfurization pump was carried out with clear water as the medium. The numerical simulation of the liquid solid two phase flow field with the solution of limestone particles was used. The results showed that the flow law of the inner flow field was better, the feasibility of the hydraulic design scheme was verified, and the external characteristic curve of the pump was predicted. The effect of the particle parameters on the pump performance is analyzed. The main flow parts of the desulfurization pump are analyzed. The main wear position of the impeller and the pressure water chamber is predicted. The three-dimensional flow field in the inner part of the TLB600-700 type desulfurization pump is preliminarily revealed by the three-dimensional unsteady numerical simulation. The characteristics of pressure fluctuation caused by dynamic and static interference.
(4) the ANASYS software is used to analyze the flow and solid coupling analysis of the impeller of the desulfurization pump of the 2 kinds of thermal power unit absorption tower. The location of the area where the stress distribution is dense on the impeller of the desulfurization pump, the maximum position of the deformation on the impeller and the distribution of the deformation are revealed. Finally, the prototype of the desulfurization pump for the absorption tower of 2 kinds of thermal power units is carried out. The test results show that the design of 2 types of desulfurization pump prototype designed by innovation method is reasonable, the design method is reliable, the high efficiency area is wide and the fixed point efficiency is increased by 3.78 percentage points and 4.15 percentage points compared with the national standard respectively.
(5) the numerical simulation results are compared with the test results. The results show that the numerical simulation accurately reflects the flow of the internal flow field in the pump, and proves the feasibility of improving the efficiency of the desulfurization pump in the absorption tower of the thermal power unit through the combination of the test and numerical simulation, and the design of the series products of the desulfurization pump for the absorption tower of the thermal power unit. The research provides technical support for theoretical research and greatly shortens the design cycle and simplifies the tedious process of theoretical calculation.
【学位授予单位】：江苏大学
【学位级别】：博士
【学位授予年份】：2014
【分类号】：X773

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