塔式太阳能光热配套电站系统仿真研究

发布时间：2018-03-14 05:42

本文选题：太阳能辅助燃煤　切入点：塔式太阳能　出处：《华北电力大学》2015年硕士论文　论文类型：学位论文

【摘要】：太阳能作为一种取之不尽、用之不竭的清洁可再生能源,利用太阳能发电是解决当前能源问题和保护环境、节能减排的有效途径之一。将太阳能产生的热量引入常规电厂,构建太阳能光热配套电站,以实现太阳能辅助燃煤发电,为火电厂节能开辟了一条新的途径。太阳能光热配套电站不用安装纯太阳能热发电的储热系统,降低了系统投资及相应的投资风险;用太阳能替代燃煤机组部分燃料产生蒸汽,节约了燃煤消耗量,实现节能减排,同时利用燃煤机组的可调整性来填补太阳能的间歇性;在中午电网高峰负荷时,太阳能辐射最强,可有效提高机组的调峰能力。本文采用塔式太阳能锅炉与电站锅炉并列运行方案,从机组高加出口引部分给水进入太阳能光热系统,产生的合格蒸汽与电站锅炉蒸汽混合一同进入高压缸做功。根据镜场运行规律、塔式太阳能结构以及工质流动特点建立塔式太阳能光热系统数学模型,基于STAR-90仿真平台,搭建塔式太阳能光热仿真系统,并将其与某350MW机组仿真系统相连接,构建塔式太阳能光热配套系统仿真模型。在模型基础上,对光热配套电站系统的运行进行模拟,包括系统的启动、运行、停运,同时做辐射强度、给水流量、调节阀开度扰动试验。结果表明本文所建立的模型可以准确反映太阳能光热系统以及火电机组的运行规律,其动态特性变化合理有效,可以预测系统的变化特性。同时,太阳能光热系统的运行对火电机组影响不大,火电机组的控制系统不需要较大改动即可实现光热配套电站的正常运行。
[Abstract]:Solar energy is an inexhaustible clean and renewable energy. Solar power generation is one of the effective ways to solve the current energy problems, protect the environment, save energy and reduce emissions. The solar photothermal power station is constructed to realize the solar energy auxiliary coal power generation, which opens a new way for the thermal power plant to save energy. The solar photothermal auxiliary power station does not need to install the pure solar thermal power generation heat storage system. The system investment and the corresponding investment risk are reduced, the steam is produced by replacing part of fuel with solar energy, the consumption of coal is saved, the energy saving and emission reduction is realized, and the adjustability of coal-fired unit is used to fill the intermittence of solar energy. During the peak load of power grid at noon, the solar energy radiation is the strongest, which can effectively improve the peak-shaving ability of the unit. In this paper, the tower solar boiler and the power station boiler are adopted to run side by side, and the feed water from the high and outlet of the unit is introduced into the solar light and heat system. The qualified steam and boiler steam are mixed into the high pressure cylinder to do work. According to the operating law of mirror field, the mathematical model of tower solar photothermal system is established based on STAR-90 simulation platform, and the characteristics of tower solar energy structure and working fluid flow are established. The tower solar photothermal simulation system is built, and connected with the simulation system of a 350 MW unit, and the simulation model of the tower solar photothermal matching system is constructed. On the basis of the model, the operation of the photothermal power station system is simulated. The results show that the model established in this paper can accurately reflect the operation law of solar photothermal system and thermal power unit, including the system start-up, operation, outage, radiation intensity, water flow rate, adjusting valve opening disturbance test, the results show that the model established in this paper can accurately reflect the operation law of solar photothermal system and thermal power unit. The change of dynamic characteristics is reasonable and effective, and the variation characteristics of the system can be predicted. At the same time, the operation of solar photothermal system has little effect on the thermal power unit. The control system of thermal power unit can realize the normal operation of photothermal power station without big modification.
【学位授予单位】：华北电力大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：TM615

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