In thermal power generating units

due to the shortage of coal resources

the fuel often deviates from the design value.The fuel with deteriorated quality has a significant impact on the boiler of the unit

which may lead to problems such as the over-temperature of the heating surface wall temperature

the deviation of the flue gas temperature

and the excessive amount of desuperheating water.Technicians analyze and judge the main parameters during the operation process

and carry out combustion optimization adjustments for typical working conditions to improve the safety and economic efficiency of the boiler operation.Taking a 300 MW subcritical parameters bituminous coal unit in a power plant as an example

it carries out the analysis and corresponding combustion adjustments.The results show that by analyzing the changes in the wall temperature of the heating surface of the rear platen superheater

the deviation of the flue gas temperature at the outlet of the turning chamber

and the amount of emergency desuperheating water of the reheater

and at the same time

combining with the situation of leveling the primary air velocity of each coal mill in the coal pulverizing system

the settings of different horizontal swing angles of the SOFA air

and the changes in the opening degree of the perimeter air.It is found that the above factors have a influence on the operation of the boiler.The specific manifestations are as follows: after leveling the primary air velocity of each coal mill

by adjusting the horizontal swing angles of the lower two layers of SOFA air to appropriate positions under low load conditions

the wall temperature of the rear platen superheater decreases significantly

and it controlls the flue gas temperature deviation on both sides of the outlets A and B of the turning chamber within a reasonable range.When the load is high

by adjusting the opening degree of the perimeter air of the nozzles on the operating layer to the test opening degree

the amount of desuperheating water of the reheater decreases to a controllable range.