[关键词]
[摘要]
为有效解决东北电力产能过剩,促进风电、核电等清洁能源消纳问题,提升燃煤供热机组的灵活性迫在眉睫。本文针对东北地区某热电厂,通过对热电解耦时间、电锅炉型式以及不同电锅炉容量配置对机组实际发电负荷的影响等灵活性改造关键技术进行研究,确定了最佳电锅炉容量,提出了电锅炉装设方案,并对改造前后机组的调峰能力和性能指标进行对比分析。分析得出,随着电锅炉容量的增长,抵减电锅炉用电后的机组实际发电负荷率显著降低,综合考虑采暖期内机组自身厂用电及供热厂用电率的消耗,推荐配置总容量约400MW的电极式电锅炉。提升火电机组灵活性改造后,电厂调峰能力显著提升,考虑以全厂172MW发电负荷运行,整个电厂调峰能力在采暖初末期增加了368MW,采暖中期增加了528MW。改造后,全厂供热标煤耗由39.7kg/GJ降低至34.3kg/GJ,降低了5.4kg/GJ。
[Key word]
[Abstract]
In order to effectively solve the problem of excess power capacity in northeast China, promote the elimination of clean energy sources such as wind power and nuclear power, and enhance the flexibility of coal-fired heating units, it is extremely urgent. According to a thermal power plant in northeast China, this paper studies the key technologies of flexible transformation, such as thermal-electrolytic coupling time, electric boiler types and the influence of different electric boiler capacity configurations on the actual power generation load of the unit, determines the optimal electric boiler capacity, provides the installation scheme of the electric boiler, and makes a comparative analysis on the peaking capacity and performance indexes of the unit before and after transformation. The analysis shows that with the increase of the capacity of the electric boiler, the actual power generation load rate of the unit after offsetting the power consumption of the electric boiler is significantly reduced. Considering the consumption of the unit"s own auxiliary power and heating auxiliary power rate during the heating period, it is recommended to configure the electrode type electric boiler with a total capacity of about 400MW. After upgrading the flexibility of thermal power units, the peak shaving capacity of the power plant has been significantly improved. Considering the 172MW power generation load of the whole plant, the peak regulation capacity of the whole plant increased 368MW at the beginning and end of heating and 528MW at the middle of heating. After the renovation, the standard coal consumption for heating in the whole plant was reduced from 39.7kg/GJ to 34.3kg/GJ, which was 5.4kg/GJ lower.
[中图分类号]
[基金项目]