1. The modification of low nitrogen burner can replace the screen mesh of the wood block separator, clean the coarse powder separator to ensure the separation effect of the separator, and improve the fineness of coal powder by grinding machine sieve ball
In view of the coal mill out of coarse powder, for the following work: using immobilized and pulverizing system maintenance opportunity by changing sieve armour ethylene-propylene block separator exports in the coal pulverizing system, to prevent debris into the coarse powder separator. When cleaning the thick powder separator of a, b and c, it was found that there were more internal sundries, such as weeds, woven bags, branches and iron wires. There are many sundries in the coarse powder separator, which is caused by the serious wear of the screen net at the outlet of the wood block separator.
Will armour ethylene-propylene coarse powder separator to baffle Angle in the coal pulverizing system unified adjust to 45 °, fixed bends to the baffles are adjusted the cap, prevent in the operation of the baffle angles vary, keeping the best separation effect of the coarse powder separator. It is found that there are many broken steel balls and irregular steel balls in contact with the inspection and throwing ball when the unit is out of service. After repairing the liner, refill the steel ball with diameter of 30mm, 40mm and 50mm at 1:1:1. After the above treatment and treatment, the fineness of coal powder returned to normal.
After the coal pulverizing system of governance, pulverized coal fineness to the normal range, slag carbon content has a tendency to turn for the better, but it is still on the high side, shows that pulverized coal fineness on the high side is one of the reasons for the slag carbon content on the high side, but not the main reason.
2. The switching powder making system of the low nitrogen burner was reformed, the operation mode of the powder making system was changed, and the influence of the powder making system on the carbon content of slag was observed
In running parameters under normal operation, the fineness of pulverized coal slag carbon content is still on the high side, transform the coal pulverizing system operation mode, such as armour ethylene-propylene, party a and party b, d, a BingDing, YiBingDing (pulverizing system from the bottom of a YiBingDing), running a day each way, observing the layers of low nitrogen burner for slag carbon content, the influence of change of the coal pulverizing system operation mode, slag carbon content had no obvious change, can eliminate the coal pulverizing system operation mode for the effects of slag content.
Repair or replace the low-nitrogen burner with a modified low-nitrogen burner
The specific work of repair and replacement of low nitrogen burner is as follows: (2) conduct the actuator debugging of the burner to ensure the internal and external swing angles are consistent and the synchronous swing is flexible without sticking; The exhaust air baffle is also checked and debugged to ensure flexibility and smooth. (3) repair or replace all low-nitrogen burners, and wear resistant all low-nitrogen burners.