深度余热利用对锅炉影响的分析

Analysis on the Influence of Depth Waste Heat Utilization on Boiler

通过设定不同的余热容量、效率边界,探讨深度余热利用技术对锅炉设计参数的影响,并对供电煤耗进行对比分析。结果表明:计算锅炉效率时应明确参考温度;加热高压给水对于降低汽轮机热耗的效果优于加热低压凝结水;从锅炉设计角度考虑,余热容量不宜大于30 MW;采用深度余热利用技术对燃用低水分烟煤机组经济效益的提升很有限。

Based on different waste heat capacities and different efficiency boundaries,the effect of depth waste heat utilization technology on boiler design parameters was discussed,and a comparison and analysis was conducted on the power supply coal consumption.Results show that the reference temperature should be defined when calculating the boiler efficiency.Heating high-pressure feed water is more effective and efficient than heating low-pressure condensate in reducing the heat consumption of steam turbine.From the perspective of boiler design,it is recommended that the waste heat capacity should not be greater than 30 MW.For the unit with low-moisture bituminous coal adopting depth waste heat utilization technology,the improvement of economy is very limited.