共查询到20条相似文献,搜索用时 140 毫秒
1.
2.
3.
4.
随着“碳达峰、碳中和”和新型电力系统建设目标的提出,提高能效水平、减少碳排放是热电锅炉持续发展的重要途径。针对国内外既有研究成果,首先从锅炉能效分析方法和评价指标体系等方面进行文献研究。研究表明,现有评价方法与指标主要是针对锅炉热效率及技术经济指标的监测与评价,缺乏对各项影响因素的分析,难以系统化评价锅炉运行水平。其次,梳理了我国目前常用的碳核算方法,分析了影响热电锅炉碳排放的相关因素。最后,提出应耦合能效与碳排放,通过合理的评价方法和评价指标构建热电锅炉系统综合评价体系。对热电增效、节能、降碳系统优化、综合性能提升改造有一定帮助。 相似文献
5.
火电厂煤粉燃烧效率体现在燃尽程度上,一般用锅炉的飞灰含碳量来进行评价.这个参数的预知对燃料分级燃烧优化,即在能够降低NOx的排放的同时保证煤粉的燃烧效率,进而提高锅炉运行效率极为重要.分析了锅炉飞灰含碳量的影响因素,利用局部投影神经网络LPN结构简单、收敛速度快、泛化能力强和适用于非线性时变过程的特点,建立锅炉的飞灰含碳量动态预测模型.利用锅炉热态试验所得数据训练和测试该模型,结果表明,预测模型较精确地预测了飞灰含碳量,从而为燃料分级燃烧优化的进行提供了模型基础. 相似文献
6.
7.
8.
9.
10.
11.
《International Journal of Hydrogen Energy》2022,47(65):28188-28203
Hydrogen-enriched natural gas (HENG) is a promising low-carbon fuel in the industry. The fuel flexibility of the existing natural gas-fueled industrial combustion equipment is a crucial issue for the HENG application. This study evaluates the thermal and emission performances of a large-scale industrial steam boiler fueled with HENG. Considering different operation strategies, three boiler operation scenarios were proposed, namely, the unchanged fuel/air valve opening (Scenario 1), the maintained boiler capacity with unchanged valve control logic (Scenario 2), and the maintained boiler capacity with unchanged excess air ratio (Scenario 3). A model considering the thermal equilibrium and heat transfer inside the boiler was built to study the thermal efficiency under the three scenarios, and a chemical reaction network model was established to investigate the NOx emission characteristics. The results showed that thermal efficiency and NOx emission presented a similar variation trend. Both of them decreased in Scenarios 1 and 2 while increased in Scenario 3 as hydrogen volumetric fraction in HENG increased from 0 to 0.9. The differences in decarbonization potentials among the three scenarios were limited. This study implies that the trade-off between thermal efficiency and NOx emission should be carefully concerned when applying HENG to industrial steam boilers. 相似文献
12.
论述了我国层燃、半悬浮燃烧、悬浮燃烧,各种燃烧方式的优缺点,不同燃料应采用不同的燃烧方式;400多台燃煤工业锅炉测试表明:我国燃煤工业锅炉的运行效率普遍低于设计效率,从2 t/h到20 t/h以上燃煤工业锅炉,随容量的增加锅炉运行效率从68.03%到80.59%,各种能量损失中漏风引起的热损失最大,最高达21%,可采用膜式水冷壁、先进的炉排密封技术和自控技术解决漏风问题,排烟温度热损失次之,最高达5%,采用增加锅炉尾部受热面和新的循环系统来降低排烟温度;用典型案例证明了能效分析应从能源的开采、运输、利用、污染物控制全系统成本考虑,而不应从单一用能设备的效率高低来评价。 相似文献
13.
14.
针对目前中小型煤粉炉计算机控制系统在送风控制回路上,没有合适的经济性指标来衡量锅炉运行效率,提出了中小煤粉炉优化控制新方法。该方法从锅炉热效率的反平衡计算和炉膛能量平衡出发,并结合锅炉实际运行数据,舍弃了一些次要因素,并通过详细的推导,得到了在送风量改变时锅炉热效率变化的趋势--热效率判据。以该判据为依据,不断对送风控制回路的目标--烟气含氧量进行优化,从而调节风煤比,达到优化燃烧的目的。 相似文献
15.
16.
生物质颗粒燃料取代常规煤燃料对节约常规能源、优化我国能源结构、减轻环境污染具有积极的意义。生物质颗粒燃料与常规煤燃料的特性有较大的区别。当将燃煤锅炉改造为燃生物质颗粒燃料锅炉时应采取相应的改造措施。以本公司锅炉为实例对燃煤链条锅炉的炉膛和燃烧系统进行了改造,通过对炉拱、炉排、风室、卫燃带、上料系统、燃烧控制系统进行改造实现了锅炉与生物质颗粒燃料燃烧的良好匹配。能效和环保测试结果表明,锅炉改燃生物质颗粒燃料后热效率提高,污染物排放符合标准要求。 相似文献
17.
《Energy》2001,26(3):299-306
Heating appliances used in buildings are designed according to building's heating load as a function of outdoor design air temperature. Usually this temperature is quite lower than the average external air temperature during the heating season. For most of the heating season, heating appliances do not operate at their nominal heating capacity. This requires boilers to operate at a lower thermal efficiency. Furthermore, on–off cycling of the pressure oil burner increases the amount of emissions of harmful substances into the flue gases. In many systems, a built-in burner is harmonized to the heating power of a boiler. The heating appliance's thermal efficiency appears to depend on burner cycle time and boiler heating load. Thermal efficiency of the heating appliance drops during shorter burner cycle times. The shortest burner cycle time appears at approx. 50% of the boiler heating load. Interestingly, in cases where the boiler heating load is not equivalent to rated (design) boiler capacity, two methods of calculating boiler thermal efficiency produce different results. 相似文献
18.
19.
20.
分析我国燃煤锅炉现状的基础上,阐述燃煤工业锅炉节能减排的主要途径,通过加强技术改造、运行管理、水质监督等措施的应用,可提高锅炉的运行效率,实现节能减排的目的。 相似文献