What are the precautions for starting the milling system

1) Equipment inspection. There should be no accumulated dust and debris around the equipment; There is no spontaneous combustion of powder accumulation everywhere; All baffles, air locks, inspection doors, manhole doors, etc. should be flexible, and can be fully opened and closed tightly; The explosion-proof door is tight and meets the relevant requirements of the banquet cavity, and the powder level measurement device has been raised to an appropriate height; The fire extinguishing device is on standby.

2) Rotating machinery inspection. All the rotating machines are ready to be activated at any time; The oil quality of the lubricating oil system is good, the temperature meets the requirements, the oil quantity is appropriate, and the cooling water is unimpeded. The rotating machinery has undergone partial test operation after overhaul.

3) Spare enough raw coal in the raw coal bunker.

4) Electrical equipment, thermal instruments and automatic devices are all ready for starting. If it is started after overhaul, the following tests need to be done: pull-close test, accident press and torsion test, interlock device test, etc.

As the name suggests, coal-fired power generation is to burn coal in the furnace to heat water to turn it into water vapor, and then the steam enters the steam turbine to do work, driving the generator rotor to rotate for power generation. The circulating fluidized bed boiler burns the coal from the raw coal bunker directly into the furnace through the coal feeder, which was common in the previous 300 MW unit. Now, with the gradual shutdown of small units in the country, this kind of boiler is no longer common, so I will not explain it here.

Hello, I am glad to answer your questions about the [milling system workflow] and make the following: Huosun Tanli power generation generally refers to coal-fired power generation units. Coal-fired power generation, as the name suggests, is to burn the coal in the furnace to heat the water to turn it into water vapor key kela, and then the steam enters the steam turbine to do work, driving the generator rotor to rotate for power generation.

The circulating fluidized bed boiler burns the coal from the raw coal bunker directly into the furnace through the coal feeder, which was common in the previous 300 MW unit. Now, with the gradual shutdown of small units in the country, this kind of boiler is no longer common, so I will not explain it here.

Hello dear, before talking about the ball mill powder system, let's first understand the working principle of the ball mill. As the name suggests, the ball mill is to put a large number of steel balls of different sizes into the ball mill drum skin, after the ball mill starts, the motor drives the drum to rotate, and the steel balls of different sizes in the drum will strike the coal into the drum without gaps until it becomes pulverized coal. The ball mill is bulky and bulky, with high power consumption and high noise; However, the suitable erection of coal should have a wide range and reliable operation, especially suitable for grinding hard anthracite.

Now more than 300,000 units basically do not see the ball mill. I've only seen spherical fiber mill mill systems in some of the old 300,000 units. The coal of the raw coal bunker enters the coal feeder through the entrance gate of the coal feeder, and the main function of the coal feeder is to control the amount of coal to be fed through the speed and record the weight of the coal feed through the belt scale of the coal feeder.

At the same time, the instantaneous weight display of the coal feeder belt scale also provides a reference for adjusting the speed of the coal feeder and judging the coal breaking alarm at the inlet of the coal feeder. The raw coal is weighed by the coal feeder and then enters the ball mill through the outlet gate gate. The raw coal is beaten into pulverized coal in the ball mill, and the pulverized coal is blown away by the mixing air sent by the blower and the wind blown by the powder exhaust fan, and the pulverized coal passes through the wood block separator and the coarse powder separator in turn, and the large lump of coal filtered by the coarse powder separator enters the ball mill again after passing through the gas lock for secondary grinding.

The outlet of the coarse powder separator is connected to the fine powder separator, and the fine powder separator filters the pulverized coal through the air lock and wood powder separator and goes to the pulverized coal bin by the bucket elevator.

1) Equipment inspection. There should be no accumulated dust and debris around the equipment; There is no spontaneous combustion of powder accumulation everywhere; All baffles, air locks, inspection doors, manholes, etc. should be flexible, and can be fully opened and closed tightly; The explosion-proof doors are tight and meet the relevant requirements, and the powder level measurement device has been raised to the appropriate height; The fire extinguishing device is on standby.

2) Rotating machinery inspection. All rotating machinery is in a state that can be started at any time; The oil quality of the lubricating oil system is good, the temperature meets the requirements, the oil quantity is appropriate, and the cooling water is unimpeded. The rotating machinery has been tested in parts after overhaul.

3) There is enough raw coal in the raw coal bunker.

4) Electrical equipment, thermal instruments and automatic devices are all ready for starting. If the system is started after overhaul, the following tests need to be done: pull-close test, accident button test, interlocking device test, etc.

The milling system should be started after the secondary air temperature of the air preheater outlet reaches 150 after the boiler is ignited, and the specific steps are as follows:

After the commander or the main controller starts the command, start the coal mill oil station of the pulverizing system to be started, adjust the oil pressure to normal, and put the standby pump into the interlocking position. Thoroughly check that the milling system is normal.

After confirming that the boiler combustion is stable and there is no disturbance such as coal cutting off of other pulverizing systems, start the operation of the powder discharger, and confirm that the powder discharge machine is running normally.

After opening the inlet baffle of the pulverizer slightly, start the coal mill, and after the operation, comprehensively check the normal operation of the coal mill in all aspects.

Gradually open the inlet baffle of the large pulverizer and the hot air door at the inlet of the coal mill to keep the negative pressure at the inlet of the coal mill normal, and increase the temperature at the outlet of the coal mill.

When the outlet temperature of the coal mill reaches 60, start the operation of the coal feeder, adjust the speed of the coal feeder to the normal coal feed, further adjust the system air volume to maintain the negative pressure at the inlet and the differential pressure at the inlet and outlet of the coal mill, and monitor the gas powder mixture at the outlet of the coal mill should exceed the specified value.