700℃超超临界二次再热富氧燃煤锅炉设计及仿真研究
发布时间：2018-07-29 16:13
【摘要】：目前,在我国的电力行业中,以燃用化石燃料为主的火力发电厂仍占总装机容量的65%左右,是环境污染的重要来源。在治理环境污染和提高电厂效率方面都落后于国外,随着我国环境保护法律的逐渐健全,对火电厂污染物排放的要求也逐渐提高。而作为减少火电厂CO2排放的最好办法之一,富氧燃煤技术越来越受到广大学者的关注,它是采用锅炉尾部烟气中的一部分循环烟气和空气分离获得的氧气构成富氧气体,作为炉内燃烧煤粉的氧化剂,从而可以提高二氧化碳在烟气中的份额,然后对烟气进行压缩和纯化处理,即可实现CO2零排放。700℃超超临界二次再热技术具有较高的循环效率和二氧化碳减排等优点,可以弥补富氧燃煤锅炉机组循环效率低的缺陷。将这两种技术结合起来,即可实现对于火力发电节能减排的要求,因此,700℃超超临界二次再热富氧燃煤锅炉机组的设计以及运行特性的研究,对于燃煤电厂的发展和突破至关重要。本文首先以富氧燃煤锅炉机组的工作机理为基础,根据锅炉容量、参数和燃料特性,从炉膛结构、主要设备的选型以及各受热面的布置等方面,对700℃超超临界二次再热富氧燃煤锅炉机组进行初步设计;然后将锅炉机组分解成若干子系统,建立各子系统的过程和设备的动态数学模型,并利用Fortran语言编写其仿真算法,借助一体化模型开发平台GenSystem建立各系统的仿真模型,根据各系统之间实际运行的关联将其相互连接,形成整个700℃超超临界二次再热富氧燃煤锅炉机组的仿真模型;然后通过该模型的计算,对机组的结构参数进行修正,使各参数达到设计值;最后借助GenSystem仿真支撑平台,在BMCR工况下,对该锅炉机组中燃烧与风烟系统、汽水系统等主要设备进行了仿真试验,得到锅炉机组主要运行数据的变化规律,分析相关系统和设备的运行特性。对今后700℃超超临界二次再热富氧燃煤锅炉机组的设计和安全经济运行具有一定的参考意义。
[Abstract]:At present, the fossil fuel fired thermal power plants still account for about 65% of the total installed capacity in the electric power industry in China, which is an important source of environmental pollution. With the improvement of environmental protection laws in our country, the requirements for pollutant emission from thermal power plants have been gradually raised with the improvement of environmental pollution control and improvement of power plant efficiency. As one of the best ways to reduce CO2 emissions from thermal power plants, oxygen-enriched coal combustion technology has attracted more and more attention of scholars. It uses a part of circulating flue gas from boiler tail gas and oxygen from air separation to form oxygen-enriched gas. As an oxidant for burning pulverized coal in the furnace, the amount of carbon dioxide in the flue gas can be increased, and then the flue gas is compressed and purified. The CO2 zero-emission. 700 鈩，
本文编号：2153222
[Abstract]:At present, the fossil fuel fired thermal power plants still account for about 65% of the total installed capacity in the electric power industry in China, which is an important source of environmental pollution. With the improvement of environmental protection laws in our country, the requirements for pollutant emission from thermal power plants have been gradually raised with the improvement of environmental pollution control and improvement of power plant efficiency. As one of the best ways to reduce CO2 emissions from thermal power plants, oxygen-enriched coal combustion technology has attracted more and more attention of scholars. It uses a part of circulating flue gas from boiler tail gas and oxygen from air separation to form oxygen-enriched gas. As an oxidant for burning pulverized coal in the furnace, the amount of carbon dioxide in the flue gas can be increased, and then the flue gas is compressed and purified. The CO2 zero-emission. 700 鈩，
本文编号：2153222
本文链接：https://www.wllwen.com/kejilunwen/dianlidianqilunwen/2153222.html
