太阳能热发电站热力系统动态特性仿真

发布时间：2018-03-05 01:10

本文选题：太阳能热发电站　切入点：热力系统　出处：《重庆大学》2014年硕士论文　论文类型：学位论文

【摘要】：随着能源危机和大量使用化石能源带来的环境问题日益严峻，清洁能源吸引了世界各界的目光。太阳能、核能、水能和风能是目前应用最好的四大清洁能源。其中，太阳能热发电是大规模开发和利用太阳能的一个重要方式，已成为世界各国学者研究的重点。较多学者只对太阳能热发电站热力系统中单一设备或者子系统进行了研究，但是对太阳能热发电站整个热力系统研究较少，所以为了保证太阳能热发电站能够稳定、安全地运行，对太阳能热发电站整个热力系统的动态特性进行研究是非常有必要的。本论文以太阳能热发电站热力系统为研究对象，主要研究了在不同运行模式下，太阳辐照变化时热力系统的动态响应。主要工作如下： ①根据模块化建模思想，以设备为单元，将该热力系统分为接收器、油罐、管壳式换热器（壳侧流体是导热油工质、管侧流体是水蒸汽）、蒸汽蓄热器以及汽轮机、凝汽器、除氧器和阀门、泵、管道等模块。 ②采用集中参数法建立了油罐、管壳式换热器、蒸汽蓄热器的数学模型和仿真模型，并改写了以导热油为工质的泵、阀门和管道模块，对所有新建模块进行了测试，并将这些模块加入到MMS模块库中。 ③应用MMS仿真平台，搭建了完整的太阳能热发电站热力系统的仿真模型，进行了仿真模型与实际系统设计值的比较。 ④在此模型基础上，，完成了辐照度不同扰动方式（阶跃、斜坡）、不同幅度（5%、10%）、控制系统不同投入状态，以及蓄热系统参与运行等多组仿真试验研究。通过仿真计算结果与实际系统值的比较和多组动态仿真试验，证明所建模型符合热动力系统运行机理，具有一定仿真精度。在蓄热系统未投入运行和辐照变化较小时，可以通过控制系统的调节作用，使得汽轮机功率逐渐恢复到额定值；辐照变化较大时，蓄热系统投入运行，可以有效地降低辐照对汽轮机功率的影响。本文的研究结果为进一步研究控制策略和运行方式奠定了基础。
[Abstract]:With the energy crisis and the growing environmental problems caused by the massive use of fossil energy, clean energy has attracted worldwide attention. Solar, nuclear, hydro and wind energy are the four best used clean energy sources. Solar thermal power generation is an important way to develop and utilize solar energy on a large scale and has become the focus of scholars all over the world. But there is little research on the whole thermal system of the solar thermal power station, so in order to ensure the stable and safe operation of the solar thermal power station, It is necessary to study the dynamic characteristics of the whole thermal system of solar thermal power station. The dynamic response of thermal system to solar radiation. The main work is as follows:. 1 according to the idea of modular modeling, the thermodynamic system is divided into receiver, oil tank, tube and shell heat exchanger (shell side fluid is heat conduction oil working fluid, tube side fluid is steam steam, steam accumulator, steam turbine, condenser, etc. Deaerator and valves, pumps, pipes and other modules. (2) the mathematical model and simulation model of oil tank, shell heat exchanger and steam accumulator were established by means of lumped parameter method, and the pump, valve and pipeline modules with heat conduction oil as working fluid were rewritten, and all the new modules were tested. These modules are added to the MMS module library. 3 using MMS simulation platform, a complete simulation model of solar thermal power station thermal power system is built, and the simulation model is compared with the actual system design value. 4 on the basis of this model, the simulation experiments of different irradiance disturbance modes (step, slope, different amplitude, different input state of control system and heat storage system are completed. By comparing the simulation results with the actual system values and many dynamic simulation tests, it is proved that the established model accords with the operation mechanism of the thermal power system and has a certain simulation accuracy. By regulating the control system, the steam turbine power can be gradually restored to the rated value. When the radiation change is large, the heat storage system is put into operation. It can effectively reduce the effect of irradiation on steam turbine power. The results of this paper lay a foundation for further study on control strategy and operation mode.
【学位授予单位】：重庆大学
【学位级别】：硕士
【学位授予年份】：2014
【分类号】：TM615

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