摘要
基于单级低压省煤器烟气余热利用技术,提出了双级低压省煤器烟气利用技术。以300MW机组为例,根据能量守恒原理与矩阵法建立了汽轮机通用矩阵计算模型,并进行了4种设计方案的经济性计算分析与比较。结果表明,双级低压省煤器系统在提高机组效率、降低煤耗、节约成本等方面均优于单级低压省煤器系统;对于双级低压省煤器系统,将低压高温省煤器投用在较高级的加热器比投放在较低级的加热器系统能使效率提高更多。在设计方案4下,机组煤耗降低了6.4g/(kW.h),效率由未引入低压省煤器系统的46.29%提高至47.15%,每台机组每年可节约1 215.82万元,二氧化碳排放量每年可减少9.83万t,经济和环保效益显著。
Utilization of the waste heat of boiler flue gas has important significance for power plant.For single-stage low pressure economizer using in regenerative system of steam turbine,there are such problems as low temperature difference,large heat transfer area and low-temperature corrosion.So the two-stage low pressure economizer technology was proposed.Taking a 300 MW unit as an example,general computational model of the turbine side was established according to the energy conservation principle and matrix method.Economic calculation and comparison for four different design schemes was performed.Results showed that,the two-stage low pressure economizer system was superior to the single-stage technology in aspects of unit efficiency enhancement,coal consumption cut down and cost saving etc.For the two-stage system,it will enhance much more efficiency if using the low pressure economizer in the higher heater but not the lower one.For scheme 4,the coal consumption of the unit decreased by 6.4 g/(kW·h),the efficiency increased from 46.29%(with no low pressure economizer) to 47.15%,each unit can save 1.215 82×107 yuan per year.The economic benefit was huge and the CO2 emission can be reduced by 9.83×107 yuan every year.
出处
《热力发电》
CAS
北大核心
2013年第2期7-11,共5页
Thermal Power Generation
关键词
300
MW机组
双级低压省煤器
能量守恒
矩阵法
效率
300 MW unit
two-stage low pressure economizer
energy conservation principle
matrix method
efficiency
economic analysis.
