JPH08243429A - Method for controlling coal output amount of mill and device therefor - Google Patents

Abstract

PURPOSE: To bring coal output amount close to target value even when a kind of coal is changed by performing new dynamic characteristic evaluation prior to change of an output command and obtaining a correction signal of output amount in accordance therewith and controlling coal feed amount and the number of revolutions of a classifier by the correction signal. CONSTITUTION: The dynamic characteristic evaluation part 70 of a simulating device 64 performs subtraction through respective data of the previously stored standard conditions in accordance with coal moisture 66, hardness 67 of coal, primary air flow rate 68, the number of revolutions 69 of a classifier which have been measured prior to change of an output command 22 and the conversion factor of dead time, and time-lag is calculated. When the output command 22 is changed, new dynamic characteristics T1 ', T2 ' are calculated from the dynamic characteristic storing change width (B2 -B1 ) of output command value B1 , B2 . Furthermore, dynamic characteristics T1 , T2 close to practice are evaluated by multiplying the previously calculated conversion factor. An additional signal correction arithmetic part 85 calculates a preceding additional signal 36 from the dynamic characteristics T1 , T2 . An additional signal correction part 86 outputs an additional correction signal 87 according to the preceding additional signal 36.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a mill coal output control method and apparatus.

[0002]

2. Description of the Related Art FIG. 4 shows an example of a mill 1 provided in a coal-fired boiler or the like. In FIG. 4, one mill 1 is illustrated, but normally, there are a plurality of mills for one boiler. Mill 1 of is connected.

The mill 1 includes a coal bunker 2 as shown in the drawing.
The coal 3 is charged into the mill casing 7 through the coal feeding pipe 6 by the coal feeding device 5 whose amount can be adjusted by the coal feeding motor 4. Follow the rotation of the crushing table 9 while pressing the coal 3 charged from the crushing table 9 with the upper surface of the crushing table 9 which is rotationally driven through the speed reducer 8 connected to the electric motor and the upper surface of the crushing table 9 by the reduction device 10. Grinding roller 11 rolling and rolling
I'm trying to crush between.

The powder 12 produced by the pulverization is blown up in the mill casing 7 by the primary air 14 for transportation from the blow-out port 13 provided in an annular shape so as to surround the pulverizing table 9, and the mill casing 7 is blown. 7 The powder 12 that has been conveyed upward through the slit openings 17 formed by raising the outer edge portion 16 at a plurality of circumferential positions of the funnel-shaped slit cone 15 that divides the interior into upper and lower parts, and is guided further upward is , The fine powder of which the fine particles of a predetermined particle size or less are connected to the rotary classifier 19 which is provided in the upper part of the inside of the mill casing 7 and whose rotation is driven by the classifier motor 18 and which is classified. It is adapted to be supplied to a burner such as a coal-fired boiler 21 via a delivery pipe 20.

The coarse powder repelled by the rotary classifier 19 slides down the inclined surface between the slit openings 17 of the slit cone 15 and is returned from the lower end of the slit cone 15 to the central portion of the crushing table 9. Has become. Further, the output command 22 for controlling the coal-fired boiler 21 is input to the coal output control device 23, and the coal feeder motor 4 is supplied.
The rotation speed of the classifier motor 18 is controlled while the rotation speed of the classifier motor is controlled. The coal-fired boiler 21 is crushed by the mill 1 and conveyed by air to convey the fine powder delivery pipe 20.
The pulverized coal supplied through the is burned to produce steam.

FIG. 5 shows a coal output control device 23 of the mill 1.
As an example, the coal output control device 23 includes a coal output command circuit 24, a coal supply control circuit 25, and a classifier rotation speed control circuit 26.

In the coal output command circuit 24, the output command 22 is input to the change rate limiter 27, and the output command 22 is output.
The change rate setting command 28 is input to the change rate limiter 27 at the same time as the change of the output, and an output command signal 29 giving a predetermined change rate is obtained when the load increases and when the load decreases. The command signal 29 is input to the subtractor 30, and the subtractor 30 subtracts the output detection signal 31 from the output detector 31a detecting the output of the generator 21b of the steam turbine 21a and subtracting the difference. Is output to the function generator 33, the difference signal 32 is converted into a coal output, and a coal output command signal 34 as shown in FIG. 6 is created.

On the other hand, by inputting the change rate setting command 28 to the function generator 35, a preceding additional signal 36 as shown by the broken line in FIG. 7 is created, and the preceding additional signal 36 is added by the adder 37. It is configured to be added to the coal output command signal 34.

Further, the output detection signal 31 is input to a function generator 38 to obtain a main steam pressure conversion value 39 corresponding to the magnitude of the output detection signal 31, and the main steam pressure conversion value 39 is subtracted from the subtractor 40. And the detection signal 41 from the main steam pressure detector 41a that detects the pressure of the main steam supplied from the coal-fired boiler 21 to the steam turbine 21a is input to the subtractor 40 and subtracted. , The difference signal 42 is converted into a coal output correction signal 44 by the function generator 43, and the adder 45
Is added to the coal output command signal 34.

Further, the output detection signal 31 is supplied to the function generator 46.
To the main steam temperature conversion value 47 corresponding to the magnitude of the output detection signal 31, and the main steam temperature conversion value 47 is detected by the main steam temperature detector 48a detecting the temperature of the main steam. The difference signal 50 is converted into a correction signal 52 for the coal output by the function generator 51, and added to the output command signal 34 by the adder 53. are doing.

The coal supply amount control circuit 25 includes a coal output amount command signal 34 from the adder 53 of the coal output amount command circuit 24 and an amount of coal supplied by the coal supply machine 5 (FIG. 4) (for example, a coal supply machine motor). 4) is input to the subtractor 55 and the coal feed control signal 56 including the difference obtained by subtraction is supplied to the subtracter 55. The rotation of the coal feeder motor 4 of the coal machine 5 is controlled.

Further, the classifier rotation speed control circuit 26 outputs the coal supply control signal 56 of the coal supply amount control circuit 25 to the function generator 5
7 to obtain the rotation speed of the rotary classifier 19 (FIG. 4) corresponding to the coal feeding control signal 56, and the rotation speed signal 58
The rotational speed of the rotary classifier 19 (for example, the classifier motor 1
The driving speed of the classifier motor 18 is controlled by a rotation speed control signal 61 that is added to the classifier rotation speed detection signal 59 of the rotation speed detector 59a, which is detected via the adder 60. It has become.

As shown in FIG. 4, in the coal-fired boiler 21, the load is increased or decreased by the output command 22 especially at the time of starting and stopping.
The coal 3 supplied to the mill 1 is crushed by the crushing table 9 and the crushing roller 11 and then raised by the primary air 14, the coarse powder is separated by the rotary classifier 19, and only the fine powder is sent to the fine powder delivery pipe 20. Through the coal-fired boiler 21
Is supplied to the output command 22.
Changes and the coal feed control signal 56 from the coal output control device 23
Even if the value changes, a large time delay occurs after the amount of coal supplied to the pulverized coal mill 1 is changed by the coal feeder 5 and before the amount of fine coal output to the coal-fired boiler 21 actually changes. Will end up.

Therefore, when the coal feeder motor 4 and the classifier motor 18 are simply controlled based on the coal output command signal 34 which changes as shown in FIG. 6, the output as shown in FIG. There is a problem that a very large deviation S ₁ occurs between the coal amount command signal 34 (target value) and the actual amount of coal produced.
In this respect, in a boiler or the like that uses gas or oil as fuel, the fuel flow rate can be immediately controlled according to changes in the output command, so the above-mentioned time delay does not pose a problem.

In order to prevent the response delay of the coal output as described above, as shown in FIGS. 5 and 7, the coal output command signal 34 from the function generator 33 is added in advance to the coal output command signal 34 from the function generator 35. The signal 36 is added by the adder 37 (indicated by a dotted line in FIG. 7), and thus the preceding additional signal 3
When the coal feeder motor 4 and the classifier motor 18 are controlled based on the coal output command signal 34 with 6 added,
As shown by the diagonal lines in FIG. 7, the coal output command signal 34 (target value)
The deviation S ₂ between and can be reduced.

[0016]

However, also in the conventional coal output control device 23 shown in FIG. 5, the water content of the coal 3, the hardness (HGI) of the coal 3, the flow rate of the primary air 14, the rotary classification. When the rotation speed of the machine 19 changes, there is a problem that the degree of the response delay changes. In particular, in the case of the coal-fired boiler 21 that uses different origins and different types of coal 3 as a raw material, the water content and hardness of the coal 3 change each time due to a change in the coal type, and the coal output characteristics of the mill 1 are improved. This has a large effect, and therefore the deviation S ₂ between the target coal output command signal 34, which is the target value shown by hatching in FIG. 7, and the actual output amount becomes large, and the main steam temperature of the coal-fired boiler 21 and This causes a large change in the main steam pressure, which causes a problem of deteriorating controllability.

The present invention has been made in view of the above circumstances, and enables stable coal output control by bringing the coal output close to the target output command signal even when the coal type changes. An object of the present invention is to provide a mill output control method and apparatus capable of controlling the amount of coal output.

[0018]

According to the present invention, a coal feed amount and a classifier of a mill are added to a coal output amount command signal obtained on the basis of an output command by adding a preceding additional signal when the output command changes. A method for controlling the amount of coal output from a mill that controls the number of revolutions of coal, the moisture content of the coal, the hardness of the coal, the primary air flow rate, and the number of revolutions of the classifier The dynamic characteristics of the coal output of the mill are measured and stored in advance, and the moisture content of the coal, the hardness of the coal, the primary air flow rate, and the number of revolutions of the classifier that are newly obtained prior to the change in the output command are stored in advance. The new dynamic characteristic is evaluated based on the dynamic characteristic of the coal output of the mill, and based on the dynamic characteristic evaluation, the rising angle of the preceding addition signal to be added to the output instruction signal when the output command changes and the initial addition. A height-changed additional correction signal is obtained and based on the additional correction signal. Mill coal output control method and controlling the coal feed amount and classifier rotational speed have those according to.

Further, according to the present invention, when the output command changes, a coal output amount command signal which is changed at a change rate according to a change rate setting command is output, and when the output command changes, the coal output amount command signal is output. A coal output amount command circuit for adding a preceding addition signal to, and a coal supply amount control circuit for inputting the coal output amount command signal of the coal output amount command circuit to control the amount of coal supplied to the mill, A mill coal output control device comprising a classifier rotation speed control circuit that controls the rotation speed of a classifier based on a coal supply control signal of the coal supply rate control circuit, wherein the water content of coal, the hardness of coal,
The dynamic characteristics of the mill coal output when the output command changes when the primary air flow rate and the classifier rotation speed change respectively were measured and stored in advance, and were newly obtained prior to the change of the output command. Moisture of coal, hardness of coal, primary air flow rate, a new dynamic characteristic evaluation based on the dynamic characteristics of the mill output of coal stored for the classifier rotation speed, and based on the dynamic characteristic evaluation, output A simulation device that outputs an additional correction signal for correcting the rising angle and the initial additional height of the preceding additional signal added to the coal output command signal when the command changes to the coal supply control circuit and the classifier rotation speed control circuit The present invention relates to a mill coal output control device characterized by being provided.

[0020]

In the present invention, the dynamic characteristics of the mill coal output at the time when the output command changes when the moisture content of the coal, the hardness of the coal, the primary air flow rate, and the number of revolutions of the classifier change are measured and stored in advance. It should be noted that, regarding the newly obtained water content of coal, hardness of coal, primary air flow rate, and classifier rotation speed prior to the change of the output command, based on the stored dynamic characteristics of the mill coal output, Performing a dynamic characteristic evaluation, based on the dynamic characteristic evaluation,
Obtaining a coal output amount correction signal for changing the rising angle of the preceding addition signal added to the coal output amount command signal when the output command changes and the initial addition height, and based on the output amount correction signal, the coal supply amount and Since the classifier speed is controlled, even if the coal type changes and the water content and hardness of the coal change, the coal output can be brought closer to the target output command signal, which is a stable output. Control can be performed.

[0021]

Embodiments of the present invention will be described below with reference to the drawings.

FIG. 1 shows an embodiment of the present invention applied to the coal output control device 23 of FIG. 5, and the same reference numerals in the drawing represent the same parts.

As shown in FIG. 1, a coal output command circuit 24 similar to that shown in FIG. 5 is provided so that when the output command 22 changes, the output command 22 is changed at a change rate according to a change rate setting command 28. When the output command 22 changes, the preceding addition signal 36 is added to the coal output amount command signal 34.

Further, the coal output command signal 34 of the coal output command circuit 24 is input to the coal supply motor 4 to supply the coal supply control signal 5
6 is provided with a coal feeding control circuit 62 for controlling the amount of coal fed to the mill 1 (FIG. 1), and further, based on the coal feeding control signal 56 of the coal feeding control circuit 62, the number of revolutions of the classifier motor 18 is increased. A classifier rotation speed control circuit 63 that outputs a control signal 61 to control the rotation speed of the rotary classifier 19 (FIG. 1) is provided.

Further, in addition to the above configuration, a dynamic characteristic evaluation simulator 64 is provided.

As shown in FIGS. 1 and 2, the simulation device 64 receives the output command 22 and the change rate setting command 28 input to the coal output amount command circuit 24, and when the load increases and the load decreases. At some time, an output command signal 29 given a predetermined rate of change is obtained and displayed, and further, the output command signal 29 is converted into a coal output by the coal output command circuit 24, and a preceding addition signal 36 is further added. In addition, a coal output command signal input unit 65 for inputting and displaying the coal output command signal 34 at the outlet of the adder 53 after correction by the main steam pressure and the main steam pressure is provided. There is.

The simulating device 64 includes a mill 1
The respective data of the moisture content 66 of coal, the hardness 67 of coal, the primary air flow rate 68, and the number of revolutions of the classifier 69 which influence the coal output characteristics of (FIG. 1) are input, and when the respective data are changed. A dynamic characteristic evaluation unit 70 capable of calculating the dynamic characteristics of the coal output of the mill is provided. At this time, the water content of the coal 66
The hardness 67 of the coal and the hardness of the coal change every time the type of coal changes, and since it is a requirement that has a great influence on the coal output characteristics, they are evaluated and entered, and the primary air flow rate 68 and the number of revolutions of the classifier The change in 69 also has a large effect on the dynamic characteristics of the coal output, and it also has an immediate effect with a small time delay, so this is also evaluated and input.

The dynamic characteristic evaluation section 70, for example, outputs the output command 22.
From the output command value B ₁ '(40%) to the output command value B ₂ ' (1
00%), the dead time T ₁ ′ from the increase point of the output command 22 to the point at which the actual increase of the coal output is started, and the point at which the actual increase of the coal output is started. , It was necessary for the actual coal output to change up to the point of 67% of the difference between the output command value B ₁ '(40%) before the change and the output command value B ₂ ' (100%) after the change. Time delay T ₂ 'with coal moisture 66', coal hardness 67 ', primary air flow 6
8 ', the average one standard condition of the classifier rotation speed 69' is obtained in advance, and the standard condition is stored in the condition storage unit 71 shown in FIG.
The dead time T ₁ 'and the time delay T ₂ ' when the hardness 67 'of the coal, the primary air flow rate 68', and the classifier rotation speed 69 'are individually changed (different from the standard condition).
The effect on and is evaluated at a plurality of points, and the result is input to the function generators 72 to 75.

Further, under the above-mentioned standard conditions, the dead time T ₁ 'when the output command 22 is changed so that the change width B ₂ ' -B ₁ 'of the output command values B ₁ ' and B ₂ 'changes variously. 'and time delay T _2' measured ', and the relationship between the variation width B _2' -B ₁ 'and the dead time T _1' 'and the time delay T _2' 'to be stored in the dynamic characteristic storage section 76 Therefore, when the output command values B ₁ and B ₂ by the new output command 22 are input, the change width B ₂ −B ₁
And the stored dead time T ₁ ″ and time delay T ₂ ″
Therefore, the dead time T ₁ 'and the time delay T ₂ ' are required.

Further, the dynamic characteristic evaluation section 70 is newly provided with
Moisture 66 of coal evaluated, hardness of coal 67, primary air
A flow rate of 68 and a classifier rotation speed of 69 were individually provided.
It is input to the subtracters 77-80, and
Corresponding to the reference condition stored in the condition storage unit 71.
Moisture 66 'of coal, hardness 67' of coal, primary air flow rate 6
8 ', classifier rotation speed 69' data is subtractor 77-80
Before being input to and subtracted, and the signals of the difference corresponded respectively
Time delay T input to the function generators 72 to 75 ₁'When
Time delay T₂Is converted into a conversion coefficient of
Each of the above-mentioned dynamic characteristic storage units 76 through the multipliers 81 to 84
Ranotam Time T₁’And time delay T₂Is multiplied by
Standing time T₁And time delay T₂So that
ing.

Further, the simulation device 64 is provided with an additional signal correction calculation section 85 and an additional signal correction section 86.

The additional signal correction calculation unit 85 indicates to the additional signal correction unit 86 the rising angle α of the preceding additional signal 36 indicated by the diagonal lines.
And the initial additional height L are set, and the dynamic characteristics T ₁ and T ₂ calculated by the dynamic characteristic evaluation unit 70 are input to T
₁ / T ₁ ′, T ₂ / T ₂ ′, the rising angle α and the size of the initial additional height L are calculated from the data obtained in advance, and the results are displayed. There is.

The rising angle α ₁ and the initial additional height L ₁ newly obtained by the additional signal correction operation unit 85 are input to the additional signal correction unit 86, and two points are shown in the figure with respect to the preceding additional signal 36. As shown by the chain line, the shape of the preceding addition signal 36a is changed and the result is displayed, and the addition correction signal 87 based on the preceding addition signal 36a is output. At this time, the magnitudes (areas) of the signals added by the preceding additional signals 36, 36a are controlled to be the same.

The additional correction signal 87 from the additional signal correction section 86 is added to the coal output amount command signal 34 input to the coal supply control circuit 62 from the coal output amount command circuit 24 shown in FIG. The additional correction signal 87 is converted by the function converter 89 into a rotation speed signal of the classifier, and the adder 90 is added to the rotation speed signal 58 from the function generator 57 of the classifier rotation speed control circuit 63. I am trying to add through.

Further, in the above embodiment, the detailed description was given only when the output command 22 was increased, but the same operation can be performed when the output command 22 is decreased.

Next, the operation of the above embodiment will be described.

Stone measured before the change of the output command 22
Moisture 66 of coal, hardness 67 of coal, primary air flow rate 68, min
Each data of the class machine speed 69 is simulated by the simulator 64
When input to, as shown in FIG.
6, coal hardness 67, primary air flow rate 68, classifier speed
Each of the 69 inputs to its own subtractor 77-80
The corresponding reference condition stored in the condition storage unit 71
Moisture 66 'of coal, hardness of coal 67', primary air
Subtracted with the data of flow rate 68 ', classifier rotation speed 69',
The difference signals are input to the corresponding function generators 72 to 75.
Forced dead time T ₁’And time delay T₂’Conversion factor
Are converted and the respective conversion factors are input to the multipliers 81 to 84.
Be done.

On the other hand, when the output command 22 changes, the output command values B ₁ and B _{2 of} the output command 22 are input to the dynamic characteristic storage unit 76 of FIG. 3, and the output command value change width B ₂ -B ₁ dead time stored in the dynamic characteristic storage section 76 T ₁ '' and the time delay T ₂ '' and a new dead time from the relationship of T ₁ 'and the time delay T _2' is obtained immediately.

The new dynamic characteristic T thus obtained
₁ ′ and T ₂ ′ are corrected by being multiplied by the conversion factors based on the measurement data from the function generators 72 to 75 by the multipliers 81 to 84, and the dynamic characteristics T ₁ ,
An evaluation of T ₂ is made.

Newly obtained by the dynamic characteristic evaluation unit 70.
Dynamic characteristics T₁, T₂Is added to the additional signal correction calculator 85 of FIG.
The preceding additional signal 36 inputted and shown to the additional signal correction unit 86
Rising angle α₁And initial additional height L₁And the dynamic characteristics
T₁, T₂Of T₁/ T₁’And T ₂/ T₂From the ratio with
Ask. The rising angle newly obtained in this way
α₁And initial additional height L₁Accordingly, the additional signal correction unit 86
The shape of the preceding additional signal 36 in FIG.
And an additional correction signal 87 for changing like
It

The additional correction signal 87 from the additional signal correction section 86 is added to the coal output amount command signal 34 input to the coal supply control circuit 62 from the coal output amount command circuit 24 shown in FIG.
8 to correct the coal feed control signal 56 and add the additional correction signal 87 to the function converter 89.
After being converted into a signal of the number of rotations of the classifier by the number of rotations signal 5 from the function generator 57 of the number-of-class rotations control circuit 63.
The number of revolutions control signal 61 is corrected by adding the value to 8 through the adder 90.

According to the above, the addition correction for correcting the preceding addition signal 36 when the output command 22 is changed, particularly when the water content 66 of the coal and the hardness 67 of the coal change due to the change of the coal type. The signal 87 can automatically correct the coal output command signal 34, and as a result, the deviation S ₂ between the coal output command signal 34 and the actual coal output, which is the target value shown by hatching in FIG. 7, can be calculated. It can be made as small as possible.

In the above embodiment, the case where the number of revolutions of the classifier is controlled has been described, but the opening of the classifier vane may be controlled or the rolling force of the crushing roller may be controlled. good.

[0044]

EFFECTS OF THE INVENTION According to the present invention, the dynamic characteristics of the mill coal output when the output command changes when the water content of the coal, the hardness of the coal, the primary air flow rate, and the number of revolutions of the classifier change are determined in advance. Measured and memorized, the moisture content of the coal, the hardness of the coal, the primary air flow rate, and the classifier rotation speed newly obtained prior to the change of the output command, the dynamic characteristics of the memorized mill output Based on the dynamic characteristic evaluation, based on the dynamic characteristic evaluation, the rising angle of the preceding additional signal added to the coal output amount command signal when the output command changes, and the coal output amount for changing the initial addition height. Since the correction signal is obtained and the coal supply amount and the classifier rotation speed are controlled based on the coal output correction signal, even if the coal type changes and the water content or hardness of the coal changes,
It is possible to achieve an excellent effect that the coal output can be brought close to the target coal output command signal and the stable coal output control can be performed.

[Brief description of drawings]

FIG. 1 is a block diagram showing an embodiment of a coal output control device of the present invention.

FIG. 2 is a flowchart showing an example of the simulator of FIG.

FIG. 3 is a block diagram showing an example of a dynamic characteristic evaluation unit in FIG.

FIG. 4 is a cut front view showing an example of a mill.

FIG. 5 is a block diagram of a conventional coal output control device.

FIG. 6 is a diagram showing an example of a coal output command signal.

FIG. 7 is a diagram showing a state in which a preceding addition signal is added to the coal production amount command signal and a deviation between the coal production amount command signal and the actual coal production amount in that case.

FIG. 8 is a diagram showing a deviation between a coal output amount command signal and an actual coal output amount when a preceding addition signal is not added to the coal output amount command signal.

[Explanation of symbols]

1 mill (pulverized coal mill) 5 coal feeder 19 classifier (rotary classifier) 22 output command 23 coal output control device 24 coal output command circuit 25 coal supply control circuit 26 classifier speed control circuit 28 change Rate setting command 34 Coal output command signal 36 Preceding additional signal (reference) 36a Preceding additional signal 56 Coal feeding control signal 61 Rotation speed control signal 62 Coal feeding control circuit 63 Classifier rotation speed control circuit 64 Simulation device 66 Coal moisture 66 'Coal moisture (standard) 67 Coal hardness 67' Coal hardness (standard) 68 Primary air flow rate 68 'Primary air flow rate (standard) 69 Classifier rotation speed 69' Classifier rotation speed (standard) 87 Additional correction signal α rising angle (reference) alpha ₁ rising angle L initial additional height (reference) L ₁ initial additional height T ₁ dead time (dynamic characteristics) T ₂ hours behind (dynamic characteristics) T ₁ 'dead time (dynamic characteristics) Reference) T ₂ 'time delay (dynamics) (reference) T _1' 'dead time (dynamic characteristics) (reference) T _2' 'time delay (dynamics) (reference)

 ─────────────────────────────────────────────────── ─── Continued Front Page (72) Inventor Shigeru Kusama 3-2-16 Toyosu, Koto-ku, Tokyo Ishikawajima Harima Heavy Industries Co., Ltd. Toyosu General Office

Claims (2)

[Claims] 1. A coal feed amount command signal obtained on the basis of an output command is added with a preceding additional signal when the output command changes to control the coal feed amount of the mill and the rotation speed of the classifier. The method of controlling the amount of coal output from a mill, in which the dynamic characteristics of the amount of coal output from the mill when the output command changes when the moisture content of the coal, the hardness of the coal, the primary air flow rate, and the rotation speed of the classifier change Dynamic characteristics of the mill coal output, which were measured and stored in advance, and were previously stored prior to the change of the output command, regarding the moisture content of the coal, the hardness of the coal, the primary air flow rate, and the rotation speed of the classifier. Based on the dynamic characteristic evaluation, and based on the dynamic characteristic evaluation, an additional correction signal for changing the rising angle of the preceding additional signal to be added to the coal output command signal when the output command changes and the initial additional height. Based on the additional correction signal, A mill coal output control method characterized by controlling the number of turns. 2. A coal output amount command signal that is changed at a change rate according to a change rate setting command when the output command changes, and when the output command changes, a preceding addition signal to the coal output amount command signal. Of the coal output amount command circuit, a coal supply amount control circuit for inputting a coal output amount command signal of the coal output amount command circuit to control the amount of coal supplied to the mill, and the coal supply amount A mill coal output control device comprising a classifier rotation speed control circuit for controlling the rotation speed of a classifier based on a coal feed control signal of a control circuit, wherein the water content of coal, hardness of coal, primary air flow rate, The dynamic characteristics of the mill coal output at the time of the change of the output command when each of the classifier rotation speed is changed and stored in advance, the moisture of the coal newly obtained prior to the change of the output command, Hardness of coal,
A new dynamic characteristic evaluation is performed on the basis of the stored dynamic characteristics of the mill coal output amount regarding the primary air flow rate and the classifier rotation speed, and based on the dynamic characteristic evaluation, the coal output amount command is issued when the output command changes. A mill equipped with a simulation device for outputting an additional correction signal for correcting the rising angle and the initial additional height of the preceding additional signal added to the signal to the coal supply amount control circuit and the classifier rotation speed control circuit. Coal output control device.