KR101782788B1 - Pulverizing Mill for Coal Grinding - Google Patents

Abstract

The present invention relates to a pulverizer for pulverizing coal, comprising: a main body; a stoker disposed at an upper part of the inside of the main body to supply coal; a pressurizer configured to apply pressure to the coal supplied from the stoker to pulverize the coal; a bowl disposed adjacent to the pressurizer to pulverize the coal by the pressurizer and configured to support the pressurizer at a lower part thereof; an air blower configured to move the coal pulverized by the pressurizer; and an outlet through which the coal is discharged. The pulverizer for pulverizing coal comprises: a pressurizer controller for controlling a distance between the pressurizer and the bowl; a fire prevention unit for monitoring and preventing occurrence of a fire by sensing a temperature by a temperature sensor included in the main body; and a display unit for displaying a state during operation of the pulverizer.

Description

[0001] Pulverizing Mill for Coal Grinding [0002]

The present disclosure relates to a pulverization apparatus for pulverizing coal.

The description in this section merely provides background information on this disclosure and does not constitute prior art.

Generally, a thermal power plant generates electricity by burning fossil fuels such as petroleum, coal, or gas in a burner to generate steam, and rotating the turbine using the generated steam. In the case of oil or gas, it can be supplied to the burner as soon as it is vaporized. However, the coal is made into a fine powder form by using a pulverizer and then supplied to the burner. In such a differentiator, there is a problem that a fire frequently occurs as the inlet temperature rises excessively compared to the outlet temperature. Further, in the case of a conventional pulverizer, when impurities such as bolts are contained between the pulverizer and the bowl, the pressure of the pulverizer is reduced to flow the impurities. However, impurities flowing in the pulverizer may damage the inside of the main body.

A fire monitoring system of a conventional coal pulverization differentiator (Patent Publication No. 2011-

0125014) receives each sensing value input from each dispenser outlet temperature sensor, CCD sensor, infrared ray and ultraviolet sensor through the network and displays it on the HMI screen of the central control room in real time, so the current state in each differentiator is displayed in the central control room It can detect the occurrence of fire, but it has a disadvantage that it can not be prevented or predicted before the fire occurs. In addition, when the impurities are contained in the inside, there is a disadvantage in that there is no apparatus for collecting the impurities separately, and the inside of the differentiator may be damaged and the efficiency may be lowered.

Accordingly, there is a need for a pulverizer for pulverizing coal having a device for filtering impurities and a device for suppressing a fire in a stepwise manner before an occurrence of a fire and for emitting an alarm in the event of a fire.

Accordingly, a problem to be solved by the present invention is to provide a pulverizing apparatus for pulverizing coal having a fire preventive unit capable of rapidly suppressing fire at an early stage through fire prevention in stages. In addition, the present disclosure provides a pulverization apparatus for pulverizing coal having an impurity filtering device for preventing impurities from flowing into the main body by supplying impurities to the coal to be supplied together with the impurities.

The present invention relates to an apparatus and a method for controlling a coal supply system, which comprises a main body, a charger disposed at the upper part of the main body to supply coal, a presser for crushing and applying coal to the coal supplied from the charger, A bowl for supporting the pressurizer at a lower portion thereof, a blower for moving coal pulverized by the pressurizer, and an outlet for discharging the coal, the pulverizing pulverizer for pulverizing coal in a thermal power plant, A pusher control unit for controlling a distance of the pusher; A fire prevention unit for monitoring and preventing occurrence of a fire by detecting a temperature by a temperature sensor included in the main body; And a display unit for displaying a state during operation of the differential apparatus.

Additional solutions of the invention will be set forth in part in the description which follows, and in part will be readily apparent from the description, or may be learned by practice of the invention.

It is to be understood that both the foregoing general description and the following detailed description are exemplary and explanatory only and are not restrictive of the invention, as claimed.

The pulverizing apparatus for pulverizing coal according to the present disclosure includes a fire preventive unit and can quickly suppress the fire in the early stage through the fire prevention step by step.

Further, the present disclosure can be provided with an impurity filtering apparatus to prevent impurities from flowing into the main body and damaging the inside of the main body.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a perspective view of a pulverization apparatus for pulverizing coal according to the present disclosure; FIG.
Figure 2a is a schematic view of the presser and bowl of the present disclosure;
2B is a conceptual diagram of the operation sequence of the pusher control section of the present disclosure.
Figure 3A is a schematic diagram of the impurity processor of the present disclosure;
3B is a perspective view of the impurity processor of the present disclosure;
3C is a schematic view of the through-hole of the permeation net of the impurity processor of the present disclosure;
4A is a schematic view of the fire prevention part of the present disclosure;
FIG. 4B is a schematic view depicting the internal structure of the fire prevention part of the present disclosure; FIG.
4C is a schematic view of the back side of the fire-extinguishing agent fire extinguisher supply channel of the present disclosure.
5 is a conceptual view of a display portion of the present disclosure;

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Reference will now be made in detail to the preferred embodiments of the present disclosure, examples of which are illustrated in the accompanying drawings.

In the following description, a detailed description of known functions and configurations incorporated herein will be omitted when it may make the subject matter of the present disclosure unnecessarily obscure.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a perspective view of a pulverization apparatus for pulverizing coal according to the present disclosure; FIG.

Referring to FIG. 1, the apparatus for pulverizing coal according to the present invention includes a main body 110, a charger 120, a pressurizer 130, a bowl 140, a blower 150, an outlet 160, A control unit 137, a fire prevention unit 400, and a display unit 500. The charger 120 includes a supply part for supplying coal in a funnel shape and a cylinder-shaped inflow path through which coal is introduced. The power charger 120 is located inside the main body 110, and is positioned at an upper portion thereof to supply coal. The pressurizer 130 pressurizes the coal supplied from the charger 120 and pulverizes it to produce pulverized coal with very small particles. The bowl 140 serves to hold the coal for a while so that the pressurizer 130 can perform a crushing function and to support the coal from the bottom so as not to detach the coal. The blower 150 moves the pulverized coal generated by the pusher 130 to the outlet 160.

Figure 2a is a schematic view of the presser and bowl of the present disclosure; 2B is a conceptual diagram of the operation sequence of the pusher control section of the present disclosure.

Referring to FIG. 2A, position sensors 133 and 143 may be provided at portions where the pusher 130 and the bowl 140 are in contact with each other. 2B, the pressurizer control unit 137 can maintain the distance 135 between the pressurizer 130 and the bowl 140 within a predetermined range in order to crush coal to 200mesh or less, i.e., 0.076 mm or less in diameter, And maintaining the distance value between the position sensors 133 and 143 within a predetermined constant range. Through this process, coal can be crushed to less than 200mesh and the ignition efficiency of the boiler connected to the differential device can be increased. The pusher control unit 137 can maintain the distance 135 between the position sensors 133 and 143 within a certain range of 1 cm to 5 cm and adjust the position of the pusher 130 when the distance is outside a certain range, Within the range. When the distance value is out of the predetermined range and lasts for a certain period of time, a fault situation such as impurities being caught between the presser 130 and the bowl 140 or the presser 130 not operating due to another reason is solved The operation of the charger can be stopped and a failure alarm can be displayed on the display unit 500. [

The pressurizer 130 may further include a pressure sensor (not shown). When the pressure value measured by the pressure sensor is equal to or higher than the pressure reference value, impurities are interposed between the pressurizer 130 and the bowl 140, It is possible to move the pressurizer 130 such that the distance between the bowl 140 and the pressurizer 130 is equal to or greater than an upper limit value of a certain range of 5 cm or more, whereby the impurities can be removed.

Figure 3A is a schematic diagram of the impurity processor of the present disclosure;

3B is a perspective view of the impurity processor of the present disclosure;

Referring to FIG. 3A, the apparatus for pulverizing coal according to the present disclosure may further include an impurity processor 300. Referring to FIG. 3B, the impurity processor 300 includes a transmission network 310 and a collection box 330. The permeation net 310 passes pulverized coal through a through hole 320 to be described later, and does not pass impurities such as bolts and nuts having a large size. The transmission net 310 may be made of a flexible plastic material such as PET, PE, PP, PS, or PVC. However, the transmission net 310 may be made of any material such as iron or wood. The collection box 330 serves to collect impurities that have not passed through the permeation net 310.

3C is a schematic view of the through-hole of the permeation net of the impurity processor of the present disclosure;

The through-hole 320 has a vertically raised symbol of a 12-fold resistance, and includes a first left vertex 321a to a fifth left vertex 321e from the bottom to the left of the virtual vertical line at the center And the right vertex may include the first right vertex 322a to the fifth right vertex 322e from below. A line connecting the second left vertex 321b and the second right vertex 322b is divided into a first line 325 extending in the second left vertex 321b direction, a fourth left vertex 321d, A second line 326 extending in the direction of the fourth left vertex 321d, a third left vertex 321c and a second right vertex 322b and a third right vertex 322c And the third line 327 and the fourth line 328, each line extending in the direction of the second right vertex 322b and the third right vertex 322c.

Referring again to FIG. 3B, a plurality of through holes 320 may be formed to be offset from each other in the upper, lower, left, and right directions, and the first line 325 of one through hole 320 may be formed in the other through hole 320 4 line 328 and the second line 326 of one through hole 320 may be formed adjacent to and parallel to the third line 327 of the other through hole 320 . The plurality of through-holes 320 may be formed in odd-numbered columns in the odd-numbered columns and even-numbered columns in the even-numbered columns in the transmission net 310,

The length of the first line 325, the second line 326, the third line 327 and the fourth line 328 may be at least ½ of the vertical length of the through-hole 320, But is not limited thereto. The ratio of the length of the first line 325 to the length of the third line 327 may be from 1: 1.2 to 1: 1.7. According to this, the ratio between the through holes 320 is adjusted at an appropriate ratio to increase the passing ratio of the pulverized coal, reduce the passing ratio of the impurities to remove the impurities, and protect the inside of the apparatus without loss of the pulverized coal supply amount.

4A is a schematic view of the fire prevention part of the present disclosure;

FIG. 4B is a schematic view depicting the internal structure of the fire prevention part of the present disclosure; FIG.

4C is a schematic view of the back side of the fire-extinguishing agent fire extinguisher supply channel of the present disclosure.

The fire prevention unit 400 includes a temperature value receiving unit 410 and a fire extinguishing gas supply channel 420. The temperature value receiving unit 410 receives the temperature value measured by the temperature sensor 401 provided in the main body 110 through the network.

The extinguishing agent supply channel 420 includes a first extinguishing agent supply channel 421, a second extinguishing agent supply channel 422, a third extinguishing agent supply channel 423, a connection channel 424, a common connection channel 425, 426). The first extinguishing agent is stored in the first extinguishing agent supply channel 421. The first extinguishing agent may be inert vapor including helium, neon, argon, krypton, xenon, radon, nitrogen, The second extinguishing agent supply channel 422 may store the second extinguishing agent, and the second extinguishing agent may be carbon dioxide. The third extinguishing agent supply channel 423 may store the third extinguishing agent, and the third extinguishing agent may be water extinguishing liquid.

The connection channel 424 may include a first connection channel 424a, a second connection channel 424b and a third connection channel 424c and may be formed of a flexible material such as PET, PE, PP, PS, or PVC . ≪ / RTI > The common connection channel 425 includes a first passage 425a, a second passage 425b, and a third passage 425c. The first extinguishing agent supply channel 421 is connected to the first connection channel 424a and the first passage 425a to inject the first extinguishing agent through the ejection section 426 and the second extinguishing agent supply channel 422 is connected to the first connection channel 424a and the first passage 425a, And the third fire extinguishing agent supply channel 423 is connected to the third connection channel 424b and the second passage 425b to spray the second fire extinguishing agent through the jetting section 426. The third fire extinguishing agent supply channel 423 is connected to the third connection channel 424c, And the third fire extinguishing agent can be sprayed through the spray part 426. [

The jetting section 426 is formed in the shape of a hollow cylindrical or quadrangular column, and a plurality of the jetting sections 426 are connected to the common connection channel 425. The injector 426 discharges the extinguishing agent to the outside when each extinguishing agent is injected.

The first extinguishing agent supply channel 421, the second extinguishing agent supply channel 422 and the third extinguishing agent supply channel 423 are stacked in a layered manner and have a first connection channel 424a of a flexible material, a second connection channel 424b The first connection channel 424a, the second connection channel 424b and the third connection channel 424c are coupled to the first connection channel 424a, the second connection channel 424b, and the third connection channel 424c, The first passage 425a, the second passage 425b, and the third passage 425c, respectively. The common connection channel 425 may be coupled with a plurality of jetting portions 426 formed radially around the center of the common connection channel 425.

When the temperature value is equal to or higher than a predetermined first reference value of the fire prevention unit 400, for example, 150 to 180 ° C, the fire extinguishing unit 400 injects inert vapor, which is the first extinguishing agent, in the first extinguishing agent supply channel 421, The alarm first step may be displayed on the display unit 500. [ When the temperature value is equal to or higher than a predetermined second reference value, for example, 250 to 280 ° C, carbon dioxide, which is a second extinguishing agent, is injected in the second extinguishing agent supply channel 422 and an operation stop signal is transmitted to the arsenal 120, And the second alarming step may be displayed on the display unit 500. [ When the temperature value is equal to or higher than a predetermined third reference value of 350 to 400 ° C, a fire extinguishing liquid containing water as a third fire extinguishing agent is sprayed from the third fire extinguishing agent supply channel 423, ). ≪ / RTI > A fire alarm may be sent to the central control center or 119 if the temperature value is above a predetermined third reference value for a certain period of time, for example, 10 to 15 seconds after the end of the third fire extinguisher has ended.

Spraying water containing digestive fluids to prevent or suppress fires can cause the water and coal to clog, requiring cleaning and stopping operation and allowing the device to cool down after the temperature has dropped, thereby interfering with continuity of operation And there is a problem that a complicated cleaning process is added. According to the fire prevention unit 400, the fire extinguishing agent for fire prevention or suppression is sprayed in stages according to the temperature value inside the differential apparatus, and the fire extinguisher containing water is sprayed at the final stage, Occurrence can be prevented. In addition, according to the fire prevention unit 400, various kinds of fire extinguishing agents can be injected through a single structure, thereby enabling miniaturization of the apparatus.

5 is a conceptual view of a display portion of the present disclosure;

Referring to FIG. 5, the display unit 500 may display status information of a differential apparatus including a fire notification, an operating state of a steady-state charger, an operating state of a blower, and an operating state of a pressurizer. The fire alarm can be indicated by alarms 1, 2 and 3, which are alarms related to fire occurrence. Regarding the operating state of the charger, it can indicate whether or not the charger is operating normally. In relation to the operating condition of the blower, it can be displayed so that it can be judged whether or not the blower is normally operating and transporting the pulverized coal to the inlet of the boiler. With respect to the operating state of the pressurizer, it can be displayed so as to judge whether or not the operation is normally performed by the impurities.

It will be understood by those of ordinary skill in the art that various changes in form and details may be made therein without departing from the spirit and scope of the present disclosure, It will be possible. The present embodiments are intended to illustrate and not to limit the technical spirit of the present disclosure, and thus the scope of the present disclosure is not limited by the present embodiment. The scope of protection of the present disclosure should be construed according to the scope of the claims, and all technical ideas which are deemed to be equivalent or equivalent should be construed as being included in the scope of the present disclosure.

110: main body 120: charger 130:
133: Position sensor 135: Distance value 140: Bowl
300: Impurity processor 310: Transmission net 320: Through hole
321a to e: first to fifth left corner points 322a to e: first to fifth right corner points 325: first line
326: second line 327: third line 328: fourth line
330: Collection Box
400: fire prevention unit 401: temperature sensor 410: temperature value receiver
420: Extinguishing agent supply channel 421: First extinguishing agent supply channel 422: Second extinguishing agent supply channel
423: Third Extinguishing Agent Supply Channel 424: Connection Channel 424a: First Connection Channel
424b: second connection channel 424c: third connection channel 425: common connection channel
425a: first passage 425b: second passage 425c: third passage
426:
500:

Claims (16)

A pressurizing unit for pressurizing and pulverizing coal supplied from the desulfurizer, a pressurizer for pressurizing the coal supplied from the desulfurizer, and a pressurizer for pressurizing the pressurizer, the pressurizer being disposed adjacent to the pressurizer so as to crush the coal, And an outlet through which the coal is discharged. The apparatus for pulverizing coal for a coal-fired power plant includes:
A pusher controller for controlling a distance between the pusher and the bowl;
A fire prevention unit for monitoring and preventing occurrence of a fire by detecting a temperature by a temperature sensor included in the main body; And
And a display unit for displaying a state during operation of the differential apparatus,
The fire-
A temperature value receiving unit for receiving a temperature value measured by a temperature sensor provided in the main body through a network; And
And an extinguishing agent supply channel for receiving the temperature value and injecting the extinguishing agent when the temperature value is equal to or higher than a reference value,
Wherein the extinguishing agent supply channel includes a first extinguishing agent supply channel, a second extinguishing agent supply channel, a third extinguishing agent supply channel, a connection channel, a common connection channel,
Wherein the reference value includes a first reference value, a second reference value, and a third reference value,
The first extinguishing agent is injected through the first extinguishing agent supply channel when the temperature value is equal to or higher than the first reference value,
The second extinguishing agent is injected from the second extinguishing agent supply channel when the temperature value is equal to or higher than the second reference value,
The third extinguishing agent is injected from the third extinguishing agent supply channel when the temperature value is equal to or higher than the third reference value,
The connection channel includes a first connection channel, a second connection channel, and a third connection channel,
The common connection channel comprising a first passage, a second passage and a third passage,
Wherein the first extinguishing agent supply channel is connected to the first connection channel and the first passage to inject the first extinguishing agent through the injection unit,
Wherein the second extinguishing agent supply channel is connected to the second connection channel and the second passage to spray the second extinguishing agent through the injection unit,
Wherein the third extinguishing agent supply channel is connected to the third connection channel and the third passage to inject the third extinguishing agent through the injection unit,
Wherein the first fire extinguishing agent supply channel is coupled to one side of the first connection channel, the second fire extinguishing agent supply channel is connected to one side of the second connection channel, and the third fire extinguishing agent supply channel is connected to one side of the third connection channel,
The other side of the first connection channel, the second connection channel, and the third connection channel is connected to one side of the common connection channel, and the first passageway, the second passageway, and the third passageway, Respectively,
And the common connection channel is coupled to the other of the common connection channels with a plurality of splitter portions radially arranged around the center of the common connection channel
Wherein the coal pulverizing apparatus comprises: The method according to claim 1,
The pusher control unit,
Maintaining the distance between the bowl and the position sensor provided in the pusher within a predetermined range to maintain the distance between the pusher and the bowl within a predetermined distance range,
Wherein the predetermined distance is a distance that allows the coal to be crushed to a size of 0.076 mm or less in diameter. delete 3. The method of claim 2,
When the pressure value measured by the pressure sensor provided in the pressurizer is equal to or higher than the pressure reference value,
Wherein the pressurizer is moved so that the distance between the bowl and the pressurizer is equal to or greater than an upper limit value of the predetermined range. The method according to claim 1,
Further comprising an impurity processor for filtering impurities other than coal,
The impurity processor includes:
A permeate net blocking the outlet from which the coal is removed from the bowl; And
And a collection box for collecting impurities that have not passed through the permeation net. 6. The method of claim 5,
Wherein the transmission net includes a plurality of through holes,
The through-hole has a shape in which the sign of the 12-fold bent resistor is set vertically,
A vertex on the left side of the center includes a first left vertex to a fifth left vertex from below and a vertex on the right side includes a first right vertex to a fifth right vertex from below,
A line connecting a second left vertex and a second right vertex extends in a second left vertex direction,
A second line in which a line connecting the fourth left vertex and the third right vertex extends in the fourth left vertex direction,
And each line connecting the third left vertex, the second right vertex, and the third right vertex is a shape including a third line and a fourth line extending in the direction of the second right vertex and the third right vertex. Pulverizing differential equipment. The method according to claim 6,
The plurality of through-holes may be formed in a plurality of rows,
Wherein the first line of one through-hole is formed in parallel adjacent to the fourth line of the other through-hole,
And the second line of one through-hole is formed adjacent to and parallel to the third line of the other through-hole. The method according to claim 6,
Wherein the lengths of the first line, the second line, the third line and the fourth line are 1/2 or more and 2/3 or less of the vertical length of the through-hole. The method according to claim 6,
Wherein the ratio of the length of the first line to the length of the third line is 1: 1.2 to 1: 1.7. delete delete delete delete delete delete delete

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