Problems and solutions in boiler commissioning and operation

When the primary fan is overloaded, the motor is overloaded during the initial start-up trial operation, so that the overcurrent protection action causes the fan inlet baffle to be unadjustable. The problem has been solved without changing the fan starting method and cutting the fan blades. After comprehensive analysis, it was decided to adopt a method of changing the air circulation area, and gradually reduce the flow section of the tuyere by using a paper-shell method at the air outlet of the fan.

The results show that when the area of ​​the air intake is reduced to 3/5, the fan current is gradually reduced. When the opening degree of the inlet baffle is adjusted, the air volume changes linearly. Tests show that the fan selection is large, the motor selection is small, and the fan startup is difficult to overcome the excessive air leakage, resulting in motor overload. Later, the five inlet baffles of the fan inlet were changed to three adjustable, the two ends were closed and fixed, the throttling was increased, and the baffle was added on the air passage to solve the problem of fan overload. The No. 3 furnace primary fan blade cut short 65mm, resulting in the fan air volume can only be maintained at 60,000m3 / h, the boiler can only run with 90t / h load, there is no room for adjustment of the primary air volume.

Burner primary air duct expansion joint burned out the inner wall refractory paint burnt down No. 3 furnace When entering the high temperature oven, the No. 2 burner was partially overheated and burned red. After checking the joint between the oil gun ignition area and the primary air inlet, the outer lining bauxite castable can not withstand the high temperature baking above 800e (the castable can only bear 700e, causing the castable to burn down and collapse, resulting in the burner The lining of the local steel jade crack collapse. One of the reasons is that the air leakage in the burner inlet chamber is reduced due to the air leakage in the non-expansion section of the primary air duct, which reduces the flow rate of the flue gas of the air distribution plate and cannot make the inner cylinder of the burner. The wall is well cooled. It is changed to a high temperature resistant metal expansion joint, the surface of the steel lining is increased by temperature measurement point, and the oil pressure of the main pipe and the atomizing piece (output <300kg/h) are adjusted. When the atomization angle is 30b40b, the wall is Incomplete combustion and overheating of the casing have been alleviated, but the heating process has been extended; if the atomized piece with 450kg/h output is used, the ignition start time should not exceed 8h, and the bed material is always in fluidized state. There is basically no burning phenomenon of the burner. From the perspective of operation, the installation period of the boiler is short, and the cooking time of the burner is not enough, which is also a cause of the detachment of the lining.

Waist Support

Waist Support,Waist Support Belt,Waist Brace,Back Support,Back Support Belt

Shijiazhuang AoFeiTe Medical Devices Co., Ltd. , https://www.aofit.com