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.