共查询到20条相似文献,搜索用时 125 毫秒
1.
2.
3.
火电机组进行深度调峰低负荷运行将成为常态,摸清典型锅炉深度调峰能力具有较大意义。对3台试点典型燃煤机组进行深度调峰试验。结果表明:掺烧高挥发分、低热值煤对提高锅炉特别是设计燃烧器截面热负荷较低锅炉的低负荷稳燃能力是有利的;亚临界锅炉不存在干湿态转换的问题,深度调峰水动力性能优于超临界、超超临界锅炉;通过分级省煤器、省煤器旁路烟道改造或增设0号高压加热器,优化吹灰、增加锅炉送风量等方式,可以提高SCR入口烟气温度;分级省煤器的低负荷节能效果优于省煤器旁路烟道改造和增设0号高压加热器;低负荷运行中,在保证SCR入口烟气温度的前提下,应适当控制锅炉送风量以降低干湿态转换点和提高锅炉效率。 相似文献
4.
5.
6.
随着汽轮机的发展和电网峰谷差的不断增大,对机组的调峰和调频要求越来越高。因此,降低运行成本,改善机组运行可靠性和控制灵活性,已成了各电厂特别是老电厂的当务之急。介绍了广州石化1号机组液压调节系统改造为数字式电液调节系统的改造方案,对比分析了机组调节系统改造前后的控制水平。 相似文献
7.
8.
本文介绍了某350MW超临界单辅机直流锅炉深度调峰改造的技术方案,对30%负荷下锅炉运行方式进行调试并对30%负荷下锅炉脱硝能力、汽水温度、烟气温度、锅炉水动力、烟道低温腐蚀等进行了评价,计算了30%负荷下锅炉效率,得出该锅炉通过烟气旁路改造具备机组长期在30%负荷下安全运行能力. 相似文献
9.
10.
11.
介绍了平煤集团坑口电厂1#锅炉实施改烧煤泥的基本情况,针对锅炉改烧煤泥后的运行情况进行了研究分析,提出了合肥的燃烧器改造方案,并通过适当的调整锅炉运行参数使得改烧煤泥后锅炉运行情况良好,取得了显著的经济效益和社会效益。 相似文献
12.
13.
14.
15.
16.
With the increased interest in exploiting renewable energy sources for district heating applications, the economic comparison of viable options has been considered as an important step in making a sound decision. In this paper, the economic performance of several energy options for a district heating system in Vancouver, British Columbia, is studied. The considered district heating system includes a 10 MW peaking/backup natural gas boiler to provide about 40% of the annual energy requirement and a 2.5 MW base‐load system. The energy options for the base‐load system include: wood pellet, sewer heat, and geothermal heat. Present values of initial and operating costs of each system were calculated over 25‐year service life of the systems, considering tax savings due to depreciation and operating costs, and salvage value of equipment and building and resale price of land in the cash flow analysis. It was shown that the natural gas boiler option provided less expensive energy followed by the wood pellet heat producing technologies, sewer heat recovery, and geothermal heat pump. Among wood pellet technologies, the grate burner was a less expensive option than powder and gasifier technologies. It was found that using natural gas as a fuel source for the peaking/backup system accounted for 37% of the heat production cost for the considered district‐heating center. The results show that the cost of produced heat from wood pellet grate burner is well comparable to that of the natural gas boiler. Emissions of the systems are also calculated in this study. It is shown that the natural gas boiler for the base‐load heat production would produce more than 4300 tonnes of GHG emission per year, while wood pellet burning systems are GHG neutral. Sensitivity analysis on various inputs to the economic model has been carried out. It was shown that 20% increase in capital cost of the natural gas base‐load system or 1% decrease in wood pellet price inflation would make the wood pellet grate burner economically preferable to the natural gas boiler. Copyright © 2009 John Wiley & Sons, Ltd. 相似文献
17.
18.
19.