KR100503200B1 - Controller for controlling the amount of the coal feeding in the coal moisture control apparatus - Google Patents

Abstract

The present invention relates to a coal discharging control device of a coal drying facility for drying and charging the water of 8 ~ 9% of the existing coke manufacturing coal to 6 to 7% to improve the quality and productivity of coke, the inlet of one end Cylindrical dryer which is inclined at a predetermined angle so that coal introduced through the outlet is discharged through an outlet of the other end, a heat source for supplying hot steam in a reverse direction of the coal passing direction, and the dryer is rotated at both ends thereof. It is composed of a power transmission means for transmitting power to be rotated by rotating the coal discharged from the coal drying equipment is the coal drawn through the inlet is dried by the high temperature steam flowing upward while passing downwardly inside the dryer The controlling device is a hydraulic chamber installed in the lower portion of the dryer to adjust the inclination angle of the dryer Rotation adjusting means for adjusting the rotation speed of the Linder and / or the dryer, and the amount and moisture content of coal introduced through the inlet of the dryer and coal discharged and water content discharged through the outlet of the dryer Since it consists of a controller for controlling the operation of the hydraulic cylinder by measuring and comparing, it brings out the effect of preventing the overload of the equipment in advance by discharging the dry coal smoothly.

Description

Controller for controlling the amount of the coal feeding in the coal moisture control apparatus}

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an apparatus for controlling the discharge of coal which is dried in a dryer of a coal moisture control process (CMCP) and discharged through the outlet of the dryer, and in particular, the coal introduced through the inlet is The present invention relates to an apparatus for controlling the amount of coal to be dried by changing the inclination angle and the rotation speed of the dryer when the coal is not smoothly discharged.

In general, the coal drying equipment is a device for reducing the water content of the coal blended coke for production, it is possible to improve the productivity and quality of the coke by charging the coal reduced water content in the coke oven. That is, coal having a water content of about 8% to 9% (hereinafter referred to as 'wet coal') is coal having a water content of about 6% to 7% through a coal drying facility (hereinafter referred to as 'dry coal'). Dried).

Referring to FIG. 1, wet coal supplied from the surge bin 10 through the inlet screw 20c to the inside of the dryer 20 flows downward inside the dryer 20 which is inclined at a predetermined angle and rotates. The wet coal is discharged through the outlet of the dryer 20 in a dried state by hot steam supplied from a heat source (not shown) into the dryer. At this time, the dust generated in the dryer 20 is collected in the collector 30.

The dryer 20, which is the main unit of the coal drying plant, has a defined angle of inclination (e.g., 5.14 °, tilt 9/100), a rotational speed (e.g., 4.3 RPM) and a cross-sectional area. The amount of dry coal discharged through the outlet is always constant in proportion to the amount of wet coal introduced.

That is, referring to Figure 2, the coal transport capacity of the dryer 20, according to the following equation 1, the flow cross-sectional area (A) of the wet coal, the flow rate (V) of the wet coal, and the specific gravity of the wet coal ( It can be seen that it is proportional to ψ).

<Equation 1>

F = AV

In addition, the flow cross-sectional area (A) of the wet coal is proportional to the inner diameter (D) of the dryer 20 by Equation 2 below, and the flow rate (V) of the wet coal is the dryer by Equation 3 below. It can be seen that it is proportional to the rotation speed N and the slope S of 20.

<Equation 2>

A = (π / 4) D² · X,

<Equation 3>

V = (60 / K) NS S D.

In the above equation, X represents the coal retention rate of the dryer and K represents the transfer capacity coefficient of the dryer.

For example, the specific gravity (ψ) of coal is 0.7, the internal diameter (D) of the dryer is 4.2 m, the coal retention rate (X) is 0.22, the conveyance capacity coefficient (K) is 0.38, and the rotation speed (N) of the dryer. Is 4.3 rpm, and the dryer's inclination (S) is 9/100, the flow rate of coal (V) = 256.64 (m / Hr) in the dryer and the transport capacity (F) = 547.9 (TON / Hr) of the dryer. It can be seen that.

In other words, since the flow rate V of coal is constant, the discharge amount of dry coal discharged from the dryer 20 cannot be arbitrarily added or subtracted.

In such a coal drying system, when the coal is not discharged normally and stagnated in the dryer, it is easy to overload the incoming screw 20c, and when the coal stagnated inside the dryer is temporarily discharged, It is easy to overload the dispensing equipment, and in particular, coal is stuck inside the dryer, which has a problem of accelerating coal congestion.

The present invention has been made in order to solve the conventional problems as described above, by comparing the amount of dry coal introduced into the dryer and the amount of dry coal discharged to the outlet side compared with each other, the appropriate amount of dry coal is discharged It is an object of the present invention to provide a coal discharge amount control device of a coal drying apparatus that can control the inclination angle and / or rotation speed of the dryer when not.

In order to achieve the above object, according to the present invention, a cylindrical dryer which is inclined at a predetermined angle so that coal introduced through an inlet of one end is discharged through an outlet of the other end, and hot steam in a reverse direction of a passing direction of the coal. It is composed of a heat source for supplying power, and a power transmission means for transmitting power so that the dryer can be rotated on both ends of the rotary shaft so that coal introduced through the inlet flows upward while passing downwardly inside the dryer. The apparatus for controlling the coal discharge amount of the coal drying equipment dried by the high temperature steam includes a hydraulic cylinder installed in the lower part of the dryer so as to adjust the inclination angle of the dryer, and the amount of coal introduced through the inlet of the dryer. And the amount and number of coal discharged and discharged through the moisture content and the outlet of the dryer. By measuring the content and comparing it is characterized in that consists of a controller for controlling the operation of the hydraulic cylinder.

According to another embodiment of the present invention, the cylindrical dryer is inclined at a predetermined angle so that the coal introduced through the inlet of one end is discharged through the outlet of the other end, and supplying hot steam in the reverse direction of the passing direction of the coal. Coal in the coal drying equipment is composed of a heat source for the power source and a power transmission means for transmitting the power of the motor so that the dryer can be rotated on both ends of the rotary shaft, the coal introduced through the inlet is passed through the interior of the dryer An apparatus for controlling the discharge amount, comprising: a rotation speed variable means for adjusting the power of the motor to vary the rotation speed of the dryer, an incoming amount and a water content of coal introduced through the inlet of the dryer, and the dryer The rotation speed by measuring and comparing the discharge amount and water content of coal discharged through the outlet of Characterized in that consists of a controller for controlling the operation of the variable stage.

Hereinafter, exemplary embodiments of the present invention will be described with reference to the accompanying drawings.

3 shows a configuration of a coal drying apparatus equipped with a discharge amount control apparatus according to the present invention, and FIG. 4 is a flowchart showing an operating state of the discharge amount control apparatus according to the present invention.

First, according to one embodiment of the present invention, in order to control the discharge amount of the dry coal discharged from the dryer 20 of the coal drying equipment, the rotation speed conversion for changing the rotational speed of the drive motor 20a of the dryer 20 The control method is used. That is, as shown in FIG. 3, the inverter 20a-1 and the frequency conversion controller 20a-2 are attached to the drive motor 20a of the dryer 20, and the rotation speed of the motor 20a is Since it changes according to the change of frequency, the rotation speed of the drive motor 20a is controlled using the frequency conversion controller 20a-2. Of course, the frequency conversion is performed by the inverter 20a-1.

On the other hand, according to another embodiment of the present invention, in addition to the rotation speed conversion control method as described above, the angle conversion control method for converting the angle of the dryer 20 to control the discharge amount of the dry coal is used. According to this method, the hydraulic device 60 is installed below the base of the dryer 20, and the hydraulic controller 60a is combined to control the operation of the hydraulic device 60.

The hydraulic device 60 has four sets of hydraulic cylinders assembled to a set of hydraulic bodies, and these are operated simultaneously or separately by a control signal of the hydraulic controller 60a. And when the inclination of the dryer 20 is changed by the operation of the hydraulic device 60, a shock absorbing spring 70 for mitigating the impact acting on the dryer 60 is provided.

In addition, where wet coal is introduced from the inflow side of the dryer 20, a first measuring device 40 for measuring the weight and water content of the wet coal is provided, and the first controller 40a for controlling the same is provided. Is provided. On the other hand, the discharge side of the dryer 20 is provided with a second measuring device for measuring the discharge amount and the water content of the discharged dry coal, there is provided a second controller (50a) for controlling this. The second controller 50a compares the weight and water content of the wet coal with the weight and water content of the dry coal measured by the first controller 40a.

Hereinafter, the operation of the present invention will be described.

First, referring to FIG. 3, the amount of wet coal stored in the surge bin 10 is introduced into the dryer 20 by the quantity dispenser. At this time, the weight and moisture content of the incoming wet coal is detected and stored by the first measuring device 40 installed on the inflow side.

The wet coal is introduced into the dryer 20 and dried by a certain amount of steam, and the dried coal is discharged to the outlet side by the rotation of the dryer 20.

Then, the discharged dry coal is detected and stored by the second measuring device 50 provided on the discharge side. In this case, the second controller 50a for controlling the operation of the second measuring device 50 compares the weight and water content of the wet coal and the weight and water content of the dry coal detected by the first measuring device 50.

According to the comparison calculation result by the second controller 50a, the angle and / or rotation speed of the dryer 20 are corrected.

That is, referring to FIG. 5, moisture is measured first while wet coal is introduced, and then the weight is measured in a first load cell. The wet coal is dried by steam while being passed through the dryer 20 which is maintained at a constant inclination angle and rotates at a constant rotational speed and is discharged from the dryer 20. The discharged dry coal is weighed in the moisture measurement and the second load cell.

Thereafter, the weight and water content of wet coal and the weight and water content of dry coal are compared and calculated. That is, by comparing the discharged amount of dry coal expected from the wet coal with the actual amount of discharged dry coal, if the discharged amount of dry coal is normal, it is maintained without changing the inclination and the rotation speed of the dryer 20.

However, if the actual discharge amount of dry coal differs from the scheduled discharge amount, the inverter 20a-1 is transmitted to a signal to the hydraulic controller 60a to correct the inclination of the dryer 20 and / or to convert the frequency. By transmitting a signal to) to convert the number of revolutions of the dryer (20).

In this case, the operator may select whether the discharge amount compensation is to be converted to an angle by the hydraulic controller 60a or to a rotational speed by the inverter, as the selection switch according to the operating conditions and conditions of the facility. In other words, one of two conditions is used for driving.

Table 1 below shows the coal transport speed and the transport capacity of the dryer according to the corrected angle of the dryer 20, and Table 2 shows the coal transport speed and the transport capacity of the dryer according to the corrected rotation speed of the dryer 20.

For example, assuming 550.0 (T / HR) of coal is dried on the inlet side to dry 2% of moisture, the amount of 550.0 (1-0.02) = 539.0 (T / HR) should be released on the outlet side.

However, the amount of coal discharged to the discharge side may be detected to be 539.0 (T / HR) or less due to a phenomenon in which coal is stagnated in the dryer 20.

Table 1

Discharge side detection amount (ton / hr) Dryer tilt Dryer Calibration Angle Conveying speed (m / hr) Carrying capacity (ton / hr) 540 9.0 / 100 5.1 256.6 547.9 510 9.5 / 100 5.4 270.9 576.6 480 10.0 / 100 5.7 285.2 608.8 450 10.5 / 100 6.0 299.4 639.3 420 11.0 / 100 6.3 313.7 669.7 390 11.5 / 100 6.6 327.9 700.1 360 12.0 / 100 6.9 342.2 730.6 330 12.5 / 100 7.2 356.5 761.0 300 13.0 / 100 7.5 370.7 791.5 270 13.5 / 100 7.8 385.0 821.9 240 14.0 / 100 8.1 399.2 852.3 210 14.5 / 100 8.4 413.5 882.8 180 15.0 / 100 8.7 427.7 913.2

TABLE 2

Exit detection amount Dryer RPM (rpm) Conveying speed (m / hr) Carrying capacity (ton / hr) 540 4.3 256.6 547.9 515 4.5 268.6 573.4 490 4.7 280.5 598.9 465 4.9 292.5 624.4 440 5.1 304.4 649.9 415 5.3 316.3 675.4 390 5.5 328.3 700.8 365 5.7 340.2 726.3 340 5.9 352.1 751.8 315 6.1 364.1 777.3 290 6.3 376.0 802.8 265 6.5 388.0 828.3 240 6.7 399.9 853.7

At this time, the second controller 50a installed at the discharge side transmits the insufficient amount of data to the hydraulic controller 60a to operate the hydraulic apparatus 60 or the inverter 20a-1 and the frequency conversion controller 20a-2. To change the frequency.

As shown in the table, it can be seen that as the detection amount decreases, the angle and rotational speed of the dryer increase, and thus the transport speed and transport capacity increase.

As shown in the formula of carrying capacity (F) = A · V · ￠, the carrying capacity is proportional to the rotational speed (N), the carrying speed (V), and the carrying capacity (F), or the slope (S). ), The transport speed (V) and the transport capacity (F) are proportional to each other.

By this principle, if the phenomenon of stagnation in the dryer 20 appears immediately changes the slope or the number of revolutions of the dryer 20 to facilitate the discharge of coal.

Therefore, according to the present invention, when the dryer 20 does not discharge smoothly after drying the wet coal, but is stagnated inside the dryer 20, the apparatus according to the present invention operates to increase the flow of coal, thereby more smoothly drying coal. It is effective to prevent overloading of equipment by discharging it.

The foregoing is merely illustrative of the preferred embodiments of the present invention and those skilled in the art to which the present invention pertains may make modifications and changes to the present invention without departing from the spirit and gist of the invention as set forth in the appended claims. It should be recognized.

1 is a schematic view showing a general coal drying facility.

2 is a diagram for deriving a transport amount of coal in a coal drying facility.

3 is a block diagram of a coal drying equipment according to the present invention.

Figure 4 is a flow chart showing the operating state of the coal drying equipment according to the present invention.

<Description of Symbols for Main Parts of Drawings>

10: SURGE BIN 20: Dryer

20a: Dryer driving motor 20a-1: Inverter

20a-2: Frequency conversion controller 20b: Gus gear

20c: incoming screw 30: dust collector

40, 50: Weigher 40a, 50a: Weight controller

60: hydraulic device 60a: hydraulic controller

70: buffer spring

Claims (5)

A cylindrical dryer inclined at a predetermined angle so that coal drawn in through the inlet of one end is discharged through an outlet of the other end, a heat source for supplying hot steam in a reverse direction of the coal passing direction, and the dryer is provided at both ends thereof. Coal of the coal drying equipment is composed of a power transmission means for transmitting power to be rotated by the rotary shaft is dried by a high temperature steam flowing upward while passing through the inside of the dryer downward through the inlet In the device for controlling the discharge amount, A hydraulic cylinder installed below the dryer to adjust the inclination angle of the dryer; It is characterized in that the controller for controlling the operation of the hydraulic cylinder by measuring and comparing the incoming amount and the water content of coal introduced through the inlet of the dryer and the coal discharged and water content discharged through the outlet of the dryer Coal discharge amount control device of coal drying equipment. The method of claim 1, And a buffer spring for buffering when the inclination angle of the dryer is changed by the operation of the hydraulic cylinder. A cylindrical dryer inclined at a predetermined angle so that coal drawn in through the inlet of one end is discharged through an outlet of the other end, a heat source for supplying hot steam in a reverse direction of the coal passing direction, and the dryer is provided at both ends thereof. In the apparatus for controlling the amount of coal discharged from the coal drying equipment is composed of a power transmission means for transmitting the power of the motor to be rotated by the rotating shaft is passed through the inlet is dried while passing through the inside of the dryer, Rotational speed variable means for adjusting the power of the motor to vary the rotational speed of the dryer; It is composed of a controller for controlling the operation of the variable speed means by measuring and comparing the incoming amount and the water content of coal introduced through the inlet of the dryer and the coal discharged and water content discharged through the outlet of the dryer Coal discharge amount control device of the coal drying equipment. The method of claim 3, The rotation speed variable means is a coal discharge amount control device of the coal drying equipment, characterized in that consisting of an inverter and a frequency conversion controller. The method according to claim 1 or 3, And a selection switch for the controller to select the inclination angle conversion or the rotation speed conversion of the dryer so as to smoothly discharge the dried coal.