What are the reasons for the basic output of the coal mill and the sudden zero of the coal mill forc

The selection of coal mill is based on coal quality and boiler.

The first step in the selection of the coal mill pulverized system is to determine the type of the pulverized coal mill system.

The number of coal mills and the selection of output margin have the following requirements:

Direct blowing type: A: When the amount is less than 200MW, there are no less than 3 sets, of which 1 is standby;

B: When more than 200MW, there are no less than 4 sets of medium speed grinders, no less than 3 fans, one of which is standby;

c: When there are more than 6 fan mills, 2 are standby;

d: Double-in and double-out grinding is not used for equipment.

E: The output of high-speed and medium-speed coal mills except for standby coal mills is not less than 110% of the coal consumption of the maximum continuous evaporation of the boiler, and the total output of all coal mills before overhaul is not less than the coal consumption of the maximum continuous evaporation when checking the coal type.

F: Double in and double out of the mill, when designing the coal type, it should not be less than 115% of the coal burning amount at the maximum continuous evaporation silo type: a not less than two, not for equipment.

B: Calculate the output force is not less than 115% of the amount of coal, and not less than 100% of the coal type should be calculated first, and the coal consumption of the boiler should be calculated when the maximum continuous evaporation is used when the coal type is burned, and the value when the coal type is used for the check, and then select the coal mill model and number.

The grinding model number is not the same for each manufacturer, the model of the coal mill is generally determined by the middle diameter or outer diameter of the grinding disc of the mill, and the general model corresponds to an output, such as the output of the mine Xingli mill KXLM1700 is 15 20 tons, that is to say, the output of the grinding disc diameter of 1700 is 15 20 tons, and so on.

Method 1: Coal feeder weighing. This should be accurate, reliable data.

Method 2: Coal mill outlet measurement, need to measure the concentration of pulverized coal and wind speed and other values, the method is complicated, the data is unreliable, generally do it when the test is carried out, and the user unit is generally not capable of doing this test.

This is a problem of coal mill selection calculation, which needs to be calculated according to a lot of data such as coal quality, and the correction coefficient must be reasonably selected.

Hello, it is a pleasure to serve you and give you the following answers:1Power failure:

Due to a power failure, the motor of the coal mill suddenly stops, so that the force of the coal mill is zeroed. Solve the method of ear calling ruler: check whether the power supply is normal, if the power supply is not normal, the power supply should be replaced in time, or check whether the power plug is in good contact, if the contact is poor, the power plug with good contact should be replaced in time.

2.Motor failure: Due to the failure of the motor, the motor of the coal mill suddenly stops running, so that the force of the coal mill is zeroed.

Solution: Check whether the motor is normal, if the motor is abnormal, the motor should be replaced in time, or check whether the wiring of the motor is correct, if the wiring is incorrect, the wiring of the motor should be restored in time. 3.

Transmission failure: Due to transmission failure, the transmission of the coal mill will suddenly stop running, so that the force of the coal mill will be zeroed. Workaround:

Check whether the transmission device is normal, if the transmission device is not normal, the transmission device should be replaced in time, or check whether the chain pin connection of the transmission device is correct, if the connection is incorrect, the connection of the transmission device should be restored in time. 4.Coal mill clogging:

Due to the blockage of coal in the coal mill, the coal grinding efficiency of the coal mill will decrease, so that the force of the coal mill will be zeroed. Solution: Check whether the coal of the coal mill is blocked, if the coal is blocked, the coal should be cleaned up in time, or check whether there are debris at the feed port of the coal mill, if there is debris, the debris should be cleaned up in time.

1. Coal mill motor overload: The coal mill motor is overloaded, exceeding the rated power of the motor, resulting in too high power.

2. Coal mill motor damage: When the motor is damaged, the motor capacity decreases and the power increases, resulting in excessive power.

3. Damage to the reducer of the coal mill: when the reducer is damaged, the reduction ratio becomes larger, the speed of the motor decreases, and the power increases, resulting in too high power.

4. Uneven fineness of pulverized coal in coal mill: uneven fineness of pulverized coal, too large proportion of coarse powder, increased load of coal mill motor, increased power, resulting in too high power.

Answer: The coal mill is often limited due to the large current of the coal mill motor.

output, which affects the load of the unit. The possible reasons for the high motor current of the coal mill are: (1) the gap between the grinding bowls is too small; (2) The spring loading force is too large; (3) coal wet; (4) Low outlet temperature; (5) The air volume is too small; (6) The opening of the folding door is too small (the pulverized coal is too fine); (7) Motor overload; (8) The coal feed rate is inaccurate; (9) The grindability index of coal is small; (10) Poor coal quality (more stones, more mud, and more moisture); (11) The gap between the grinding roller head and the loading spring is not adjusted accurately.

Hello! We're happy to answer for you! The reasons for the grinding roller tile of the coal mill are as follows: 1

The machine has been operated for too long, the wear resistance is poor, and the use is improper, resulting in serious wear and tear of the coal mill roller hub; 2.The improper operation of the grinding roller leads to the deflection of the nut hole of the laughing roller frame and the base, which deforms the roller flower; 3.Lack of routine maintenance, hollow ventilation, oil grease corrosion damage to the surface of the grinding rolls.

Summary. Pro, the reasons for the grinding roller tile of the coal mill may be as follows: 1

damage to the surface of the grinding roller; 2.The surface of the grinding roller is not properly lubricated; 3.uneven pressure on the surface of the grinding roller; 4.

The abrasive contains a large number of impurities; 5.The abrasive loses its elasticity due to long running times.

Pro, the reasons for the grinding of coal and the clever grinding of the roller tile may be: 1damage to the surface of the grinding roller; 2.

The surface of the grinding roller is not properly lubricated; 3.uneven pressure on the surface of the grinding roller; 4.The abrasive contains a large number of impurities in the bridge draft; 5.

The abrasive loses its elasticity due to long running times.

Solution 1: Check the bearing of the grinding roller, and replace it in time if it is found to be damaged. 2. Check the shell of the grinding roller, if there are cracks or other abnormal conditions, it should be replaced in time if it is cracked. 3. Check the surface of the grinding roller, if there are scratches or other abnormal conditions, it should be replaced in time.

4. Correct the gap between the grinding roller and the casing to keep it within the normal size requirements. 5. Strengthen the gap between the grinding roller and the casing, so that it will not deviate due to external force. 6. Regularly maintain and repair the grinding roller to ensure its normal operation.

The reasons for the low output of the ball mill are:

1) The output of the coal feeder is insufficient, the coal quality is hard, and the grindability is poor.

2) The loading capacity of steel balls in the coal mill is insufficient or excessive. The quality of the steel balls is poor, the small steel balls are not cleaned in time, and the wavy tiles are seriously worn and not replaced in time.

3) The ventilation in the coal mill is insufficient, the drying output is low, or the moisture of the raw coal is increased. For example, the output of the powder discharge machine is insufficient, the system damper is faulty, and the coal accumulation or air leakage at the inlet of the coal mill is completed.

4) The amount of powder returned is too large, and the pulverized coal is too fine.

Measures to increase the output of the milling system are:

1) Keep the coal feed uniform to prevent coal breakage. Under the condition of keeping the outlet temperature of the coal mill unchanged, try to increase the air temperature of the coal mill inlet.

2) Add steel balls regularly, maintain a certain amount of steel balls in the coal mill, and regularly clean up unqualified steel balls and iron debris.

3) Maintain the appropriate ventilation in the coal mill, the smaller the negative pressure at the inlet of the coal mill, the better, and the powder leakage shall prevail.

4) Eliminate the air leakage of the pulverizing system, strengthen the maintenance of the coarse and fine powder separator, and keep the flexible action of each air locker.

5) Maintain the qualified fineness of pulverized coal, properly adjust the folding door of the coarse pulverizer, and the pulverized coal should not be too fine.

Coal mills'> the design of the coal mill'> output is determined under a certain premise and is actually operated.

It will be affected by many conditions, the main ones are:

1) The shape and degree of wear of the armor because it affects the drop height of the steel ball, and the armor wears out.

After that, the output of the coal mill will be reduced.

2) The loading capacity of the steel ball and the size of the steel ball, the loading of the steel ball is too much or too little, which will affect the output.

Therefore, a reasonable steel ball filling coefficient should be maintained; The size of the steel ball should be kept in a reasonable proportion and should be made up regularly.

Score the over and clear the under.

3) Too much or too little coal in the coal mill will reduce the output and increase the power consumption of coal grinding.

Therefore, the coal feed should be adjusted in time according to the pressure difference between the inlet and outlet of the coal mill to maintain the appropriate coal loading.

4) The ventilation volume affects the distribution of coal along the length of the cylinder, and the coal powder is coarse and windy when the air volume is large.

The output decreases when the volume is small. Therefore, it is important to maintain an optimal ventilation volume during operation in order to maintain economic output.

5) The change of coal quality, the increase of the moisture and particle size of the raw coal, and the decrease of the grindability coefficient will make the coal grinding.

The output of the machine decreased.

6) The pulverizing system has a large air leakage, which reduces the air volume entering the coal mill, and the output of the coal mill will be reduced.