How to Solve Problems That Ball Mill Brings

Depending on the company’s coal, often the smooth flow towards the coal mill is often disrupted. The mill will then trip on flow protection, upsetting boiler parameters and demanding instant operator corrective action.

Bowl mills are applied for pulversing coal in pulverized coal fired boilers. The coal to the mill is fed having a coal feeder within the coal bunker. You can find a great deal of type of feeders valuable for coal feeding like the belt feeder that is often in volumetric or gravimetric mode, the chain link feeder, The drag feeder, etc. Row coal inside the yard is sized in crushers and stored in coal bunkers. It really is often knowledgeable, based upon coal excellent, that the smooth flow for the coal mill can get disrupted. The mill will trip on no coal flow protection, and such a mill trip can upset boiler parameters and call for corrective action.

For taking corrective action throughout a coal hang-up in bowl mills, the operator will have to be aware of basis for such a hang up the telephone, how the plant will respond, what he has to reply to, and specifically what the nearby operator will must do. This could lessen the potential for mill trip and convey the boiler typical again condition as soon as feasible. dolomite powder machine

Specific causes

The reasons for coal hang-up to mills could be quite a few, like substantial raw coal size, jamming from the feeder, jamming of the coal chute from the bunker thanks to high moisture inside the coal, foreign material at raw coal inlet to feeder, and so on.

Plant responses

The boiler fuel input coming down as a result of coal flow hang-up the mill slowly gets unloaded. This is usually inferred from your response using the boiler.

Mill differential pressure comes down

Mill outlet temperature will rise

Boiler steam pressure will start falling

No coal flow alarm will appear

Coal feeder and mill will trip should you do time

Mill outlet temperature high alarm will appear

Operator responses

On seeing adjustments inside the operating parameters from the mill the operator will have to take corrective action.

Reduce the strain on the boiler and inform the steam consumer accordingly

Keep boiler pressure and temperature of steam

Start off reserve mill and stabilize, if reserve mill is on maintenance, then ask local operator for that cause for hang-up and the action plan

Keep steam customers informed of the action

When coal flow is restored through the reserve mill or perhaps exactly the same mill, steam consumer may perhaps be asked to enhance load coal mining equipment

Local operator responses

In this case the local operator ought to play a major function in helping the control room boiler operator by performing these checks and deciding additional program of action.

Check no matter whether the heat and cold air gates are closed, or perhaps then close both

Check heat to raw coal and feeder is closed, if not close this

Close the raw coal feeder inlet gate if not already closed

Just after creating particular just about every one of the above are closed, open the inspection door from the mill

See if the coal pipe from feeder to mill is apparent and be sure they are produced clear

Check raw coal feeder and if chocked then have it cleaned

Look at the raw coal feeder shear pin and replace if needed

Now operate on no load and look for smooth running

Look at the coal chute from bunker to feeder is apparent, that’s from your closed feeder inlet gate onwards

Look in the bunker for coal, if empty organize for filling immediately

If mill has any remnant supplies then clean the mill and restart the mill and check for smooth operation

Now clear the mill for resuming operation

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