锅炉经济性煤种掺烧技术研究

Study on economical coal blending technology for boiler

为降低燃料采购成本,某电厂拟掺烧石炭3500和神混4500等低热值的经济性煤种。拟掺烧煤种的煤质特性偏离现燃用煤种,影响了锅炉运行的安全性、经济性和环保性。本文通过煤质化验分析、试验室试验、理论分析计算、现场制粉系统优化试验、经济煤掺烧试验和运行参数优化试验等方法,对锅炉经济性煤种掺烧技术进行了系统性研究。研究结果显示:石炭3500可磨度偏低,磨损特性严重,与制粉系统及锅炉适应性差,且掺烧后机组综合供电成本上升;神混4500燃料特性与电厂主力煤种接近,大比例掺烧时锅炉运行性能良好,机组综合供电成本下降,经济效益显著;电厂可将神混4500确定为长期掺烧的经济性煤种。本研究可为有类似掺烧需求的电厂提供借鉴和参考。

In order to reduce the cost of fuel procurement,a power plant plans to burn economical coal with low calorific value,such as carbon 3500 and Shenhun 4500.The quality characteristics of the coal to be blended deviate from the coal currently used,which affects the safety,economy and environmental protection of the boiler operation.Through coal quality analysis,laboratory test,theoretical analysis and calculation,on-site pulverizing system optimization test,economic coal blending test and operation parameter optimization test,the technology of economic coal blending combustion of boiler is studiedsystematically.The research results show that the low grindability and serious wear characteristics of the carbon 3500 lead to its poor adaptability to the pulverizing system and the boiler,and the comprehensive power supply cost of the unit increases after blending combustion.The fuel characteristics of Shenhun 4500 are close to the main coal types of the power plant,the operation performance of large proportion of mixed burning boilers is good,the comprehensive power supply cost of the unit is reduced,and the economic benefits are significant.It is suggested that the power plant can determine Shenhun 4500 as an economic coal for long-term combustion.This study can provide reference for power plants with similar demand for mixed combustion.