KR101594696B1 - Under bowl auto-cleaning system for pulverizer - Google Patents

Abstract

The present invention relates to an under-bowl coal residue removing apparatus for a pulverizer. The apparatus includes: a bowl body storing falling coal residues and including an outlet to discharge the coal residues; and a coal residue guiding unit which collects the coal residues to an operating area of a scrapper rotating in the bowl body to move the falling coal residue to the outlet. The apparatus of the present invention can prevent fires by improving the structure of the pulverizer unlike a conventional technology when the occurrences of fire in the pulverizer and a coal handling facility increases as the use of low-grade coals increases in order to reduce the power generation cost while ensuring the flexibility of the coal supply. Accordingly, the present invention can increase the continued use of the low-grade coals and ensure reliability thereof as well as safely operating the facility. An air spray type ring member formed by two upper and lower ring members is installed on a corner edge of the inside of the under-bowl. Accordingly, the novel coal residue removal system can effectively discharge the coal residues by using the air pressure and the swirling air flows in order to reduce the time of internal inspection and maintenance time of the pulverizer by simplifying the structure and ensuring an easy maintenance as well as increasing the operating rate of the facility.

Description

{UNDER BOWL AUTO-CLEANING SYSTEM FOR PULVERIZER}

The present invention relates to an under-bowl residual coal removing apparatus for a pulverizer, and more particularly, to an apparatus for removing under-bowl residual coal from an under-bowl when discharging impurities generated in a pulverizer for pulverizing coal into pulverized coal, The present invention relates to an under-bowl residual carbon removing apparatus for a differentiator.

Generally, in coal-fired power plants, coal is pulverized into fine particles and burned in boilers.

In a normal thermal power plant, the unloaded coal is transported through a belt conveyor to a coal storage tank for temporarily storing the coal, and the coal is supplied to the differentiator as needed for power generation through a charger.

In the pulverizer, the supplied coal is pulverized to a predetermined size, and the pulverized coal is transferred to the boiler through an air delivery fan. Impurities such as unbranched Pyrite, iron pieces, and pebbles are sent to a rotary treatment facility .

Here, the pulverizer is a device for crushing coal into pulverized coal having a size suitable for combustion. The pulverizer includes a tube differentiator, a bowl differentiator, a roller differentiator, a beater wheel differentiator, .

Among them, the bowl differentiator is most commonly used in coal-fired power plants or coal-fired power plants due to reliability, low power consumption, and relatively quiet operation noise.

Such a bowl differentiator is composed of a structure including a bowl, a crushing roller, a bowl driving device, a roller pressing device, a lubricant system, an air sealing system, a pulverized coal separator, etc. In this bowl differentiator, So that the pulverized pulverized coal is supplied to the burner, and impurities such as pyrites, which have not been pulverized, are dropped to the lower portion of the bowl by the rising air and then discharged through the scraper to the grinding facility.

Particularly, coal residues which are not completely treated by the scrapers are accumulated around the edge of the under bowl, and there is a problem that ignition and flame are generated due to the accumulation of volatile gases accumulated in the high temperature transfer air (200 to 250 ° C) .

In other words, the fine carbon and the impurities of the high volatile components in the underside bowl are not smoothly discharged to the processing facility, and sparks are generated by spontaneous ignition or friction with the rotating scraper. As a result, There is a problem that the volatile gas is ignited to lead to the fire of the differentiator.

In consideration of this point, in Korean Patent No. 10-1031444 (registered on Mar. 19, 2011), it is possible to prevent the residual coal from remaining on the edge of the corner of the underside of the underside of the undersea bowl and to extinguish the fire 'Automatic cleaning and fire extinguishing system of undersea bowl' is proposed.

However, since piping must be provided at the corner edge of the under bowl and the nozzle must be mounted, it is not structurally disadvantageous, and since water or air is sprayed through the nozzle, nozzles are occasionally clogged due to fine residual coal dust There are disadvantages in terms of maintenance as well as deterioration.

SUMMARY OF THE INVENTION The present invention has been made in order to solve the above problems and it is an object of the present invention to provide a method and apparatus for improving the flexibility of a coal supply and a cost reduction of a coal feeder, The present invention has been made to solve the above-mentioned problems, and it is an object of the present invention to provide an under-bowl residual charcoal removal device for a differentiator which is capable of stable operation of the facility, reliability, and continual use of low-

Further, the present invention is characterized in that an air injection type ring member formed by combining two upper and lower ring members on the corner edge of the under bowl is provided, and a new member capable of effectively discharging residual coal by the air pressure and swirl- The object of the present invention is to provide an apparatus for removing under-bowl residual carbon monoxide from a differentiator which can increase the operation rate of equipment by simplifying the structure and facilitating the maintenance and repairing of the inside of the separator, have.

The apparatus for removing under-bowl residual carbon in a differentiator according to the present invention comprises: a bowl main body having a discharge port for receiving residual coal to be dropped and for discharging the coal residue; And a coal quartz guide portion inclined at a corner of the bowl main body so as to collect the falling coal into an operating region of a scraper rotated inside the bowl main body for transferring the coal residues to the discharge port side.

Wherein the quartz casting section comprises: an upper ring member extending obliquely downwardly with one side fixed to an inner circumferential surface of the bowl body; And a lower ring member extending obliquely with one side fixed to the bottom surface of the bowl body and overlapping the upper ring member.

The upper ring member and the lower ring member can form a gap therebetween such that they can be deformed by the pushing force of the residual coal agglomerated with the scraper.

Wherein the upper ring member or the lower ring member has a gap maintaining plate for holding the gap; The bowl main body may connect an air supply pipe for supplying and guiding air to remove the coal residues deposited on the upper ring member, the lower ring member and the corner portion side.

The gap holding plate is disposed to be inclined in the scraper rotating direction to induce a swirl action of the air.

The upper ring member and the lower ring member may be provided in one or more in the circumferential direction.

The coal residues discharged from the bowl body are collected in a collection bin; The collector being removably provided with a spacer on a lower side adjacent to the hub; The spacer may be provided with a gland between the hub and the hub.

A packing may be further disposed between the spacer and the hub.

As described above, unlike the prior art, the apparatus for removing under-bowl residual carbon monoxide from the differentiator according to the present invention can contribute to enhancement of facility reliability by preventing the occurrence of fire in the sprayer.

The present invention can increase fuel supply stability and profitability by continuously using low-grade carbon.

The present invention can simplify the structure such as the elimination of the air nozzle and facilitate the maintenance as well as improve the efficiency of the overall operation and improve the operation rate of the equipment by checking the inside of the dispenser and shortening the maintenance time.

The present invention can expect efficient maintenance of the maintenance manpower and intangible effect.

According to the present invention, the structure is designed to be divided into four parts, and a structure capable of being disassembled and assembled for each part is adopted, thereby facilitating the transportation and installation of the structures in the under-bowl, and simplifying the efficiency and workability of the maintenance personnel.

Accordingly, it is inevitable that the use of low-grade coal is inevitably expanded in order to secure fuel supply stability and fuel cost reduction owing to the rapid increase in coal consumption due to economic development of China and India, and the continuous use of low- In the situation where moisture and volatile matter are increasing, it is possible to prevent the fire through the improvement of the differentiator structure, thereby contributing to stable operation of the facility and increasing the reliability and continuous use of low-grade coal.

1 is a cross-sectional view showing an installation state of an underground bullet coal remover according to an embodiment of the present invention.
FIG. 2 is an enlarged plan view showing an under-bowl residual carbon removing apparatus according to an embodiment of the present invention. FIG.
FIG. 3 is a view showing a use state of an under-bowl residual carbon removing apparatus according to an embodiment of the present invention. FIG.
4 is an enlarged cross-sectional view of a main part showing an installation state of an underfloor remover for removing underground coal according to an embodiment of the present invention.
5 and 6 are perspective views showing a ring member of the apparatus for removing under-bowl carbon remover according to an embodiment of the present invention.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, embodiments of an apparatus for removing under-bowl residual carbon monoxide in a differentiator according to the present invention will be described with reference to the accompanying drawings. In this process, the thicknesses of the lines and the sizes of the components shown in the drawings may be exaggerated for clarity and convenience of explanation. In addition, the terms described below are defined in consideration of the functions of the present invention, which may vary depending on the intention or custom of the user, the operator. Therefore, definitions of these terms should be made based on the contents throughout this specification.

FIG. 1 is a cross-sectional view showing an installed state of an underground bullet brine removing apparatus according to an embodiment of the present invention, and FIG. 2 is an enlarged plan view illustrating an underground bullet brine removing apparatus according to an embodiment of the present invention.

FIG. 3 is a view showing the use state of the underground bullet charcoal removing apparatus according to an embodiment of the present invention, and FIG. 4 is an enlarged cross-sectional view showing an installed state of the underground bullet char holder removing apparatus according to an embodiment of the present invention.

5 and 6 are perspective views showing a ring member of the apparatus for removing under-bowl carbon remover according to an embodiment of the present invention.

Referring to FIGS. 1 to 6, an apparatus for removing bottoms of an under bowl 20 of a differentiator 10 according to an embodiment of the present invention includes a bowl body 30 and a residual coal inducing unit 100.

The bowl body 30 forms the outer shape of the under bowl 20 and is formed on the lower peripheral surface of the hub 50 of the differentiator 10. Thus, the bowl main body 30 collects and discharges residual coal of the pulverized coal which is scattered in the hub 50 and falls down.

Then, the bowl body 30 forms a discharge port 32 at a specific site to discharge the discharged coal residues.

In addition, the bowl body 30 includes a collecting cylinder 160. The collector 160 is positioned below the bowl body 30 and collects the coal residues discharged through the discharge port 32. At this time, the collector 160 is connected to the bowl main body 30. Particularly, the collecting cylinder 160 can be deformed into various shapes and can be detachably installed from the bowl main body 30.

In addition, the bowl body 30 has a scraper 34 inside. The scraper 34 rotates in the circumferential direction inside the bowl body 30 and collects the coal residues dropped on the floor toward the discharge port 32. [ Of course, the scraper 34 can be deformed into various shapes and various materials.

At this time, the scraper 34 must be rotated in contact with the inner surface of the bowl main body 30 so that most of the residual coal accumulated on the bottom of the bowl main body 30 can be collected toward the discharge port 32 side.

Particularly, when the scraper 34 is rotated while being in contact with the inner surface of the bowl body 30, noise is generated and the scraper 34 or the bowl body 30 can be worn. Thus, the scraper 34 is rotated with the end thereof being spaced apart from the inner surface of the bowl body 30 by a predetermined clearance.

Therefore, the remaining body coal can be accumulated along the inner corner 33 of the bowl body 30 to be deposited.

In order to prevent this, a residual coal inducing portion 100 is provided.

The quartz guide portion 100 is provided at an angle to the corner portion 33 so as to be collected into the operation (rotation) region of the scraper 34 in order to convey the falling coal to the discharge port 32 side. That is, the coal residues slip on the surface of the coal residue inducing portion 100 of the corner portion 33 and move smoothly to the inside of the turning radius of the scraper 34.

On the other hand, the quartz guide portion 100 includes an upper ring member 110 and a lower ring member 120.

The upper ring member 110 extends obliquely downwardly while one side is fixed to the inner circumferential surface of the bowl body 30 and the lower ring member 120 extends obliquely with one side fixed to the bottom surface of the bowl body 30 do. The upper ring member 110 is fixedly connected to the inner circumferential surface of the bowl body 30 in various ways such as welding or bolting and the lower ring member 120 is fixed to the bottom surface of the bowl body 30 in various ways such as welding or bolting. As shown in FIG.

At this time, the upper ring member 110 and the lower ring member 120 are partially overlapped. The upper ring member 110 and the lower ring member 120 are disposed side by side.

In particular, the upper ring member 110 and the lower ring member 120 are made of a material that can be rolled so as not to damage the scraper 34 or interfere with rotation when the scraper 34 hits the scraper 34.

The upper ring member 110 and the lower ring member 120 are disposed at a predetermined inclination (&thetas;) in the upward direction from the center of the bowl body 30 toward the edge direction. This is to allow the coal left on the surfaces of the upper ring member 110 and the lower ring member 120 to be slidably moved into the turning radius of the scraper 34. Here, the inclination [theta] of the upper ring member 110 and the lower ring member 120 is not limited.

In other words, the upper ring member 110 and the lower ring member 120 are provided along the corner portion 33, which is the inner edge of the bowl body 30, and the upper ring member 110 and the lower ring member 120 The residual coal falling into the bowl main body 30 is naturally lowered along the inclined surfaces of the upper ring member 110 and the lower ring member 120 It allows us to flow down.

The lower side of the upper ring member 110 and the upper side of the lower ring member 120 are vertically combined with each other. Of course, the upper ring member 110 and the lower ring member 120 can be deformed into various shapes and are applicable to various materials and are not limited to the number provided.

Particularly, the upper ring member 110 is inserted into the lower ring member 120 from above, and the lower end of the upper ring member 110 and the upper end of the lower ring member 120 are overlapped with each other by a predetermined length It is possible to achieve a form that is combined into a state.

The upper ring member 110 and the lower ring member 120 are manufactured in the same shape in diameter, height and inclination angle of the end face so that the upper ring member 110 and the lower ring member 120 are arranged in the vertical direction The upper ring member 110 can be naturally overlapped and overlapped with the upper ring member 110 above the lower ring member 120.

The upper ring member 110 and the lower ring member 120 are spaced apart from each other with a predetermined clearance and forming a gap 130.

The upper ring member 110 and the lower ring member 120 may have a structure capable of jetting air through the gap 130 formed at the overlapping portion between the upper ring member 110 and the lower ring member 120, .

A plurality of spacing plates 140 may be inserted into the overlapping portions between the upper ring member 110 and the lower ring member 120. In particular, the gap maintaining plate 140 is formed on the upper ring member 110 or the lower ring member 120 corresponding to the mutually facing portions, and is provided on the front side of the lower ring member 120. Here, 'front side' means the front side of the lower ring member 120 facing the rear side of the overlapping upper ring member 110.

A predetermined gap 130 is formed between the upper ring member 110 and the lower ring member 120 by the gap maintaining plate 140. [

This allows the air to flow from the outside to the inside, that is, to the inside of the lower ring member 120, through the gap 130 formed between the upper ring member 110 and the lower ring member 120.

At this time, the gap between the upper ring member 110 and the lower ring member 120 is not limited. That is, the size of the gap maintaining plate 140 is not limited. Of course, the number and shape of the gap maintaining plates 140 are not limited.

The gap holding plates 140 inserted between the upper ring member 110 and the lower ring member 120 are arranged at regular intervals along the circumferential direction of the lower ring member 120, So that a uniform gap 130 can be formed over the entire circumference of the member 110 and the lower ring member 120.

At this time, the gap holding plate 140 is positioned in an inclined posture toward the rotating direction of the scraper 34. The air discharged through the gap 130 between the upper ring member 110 and the lower ring member 120 is guided by the gap maintaining plate 140 so as to have a directionality toward one side, The swirl of the air can be caused by being discharged while being seen to be discharged.

As a result, the swirling action of the air injected through the gaps 130 of the upper and lower plates allows the coal residues to more effectively center.

Meanwhile, the upper ring member 110 and the lower ring member 120 may be divided into a plurality of parts that can be disassembled and assembled, respectively. Therefore, the bowl body 30 can be easily installed.

More specifically, the bowl body 30 is provided with a scraper which is attached to the bowl skirt 40 and rotates. A corner ring 33 of the bowl body 30 is provided with an upper ring member 110 and a lower ring member 120 are installed.

The upper ring member 110 and the lower ring member 120 in an integrally joined state are disposed along the corner portion 33 of the bowl body 30 and the upper end portion of the upper ring member 110 and the lower ring member 120 120 are welded to the wall and bottom of the bowl body 30, respectively.

Of course, the upper ring member 110 and the lower ring member 120 may be integrally provided, but they may be provided separately and air can be supplied therebetween.

The corner portion 33 of the bowl body 30, that is, the corner portion where the inner circumferential surface of the bowl body 30 meets the bottom, and the rear portion of the upper ring member 110 and the lower ring member 120, The space portion 36 is formed.

At this time, the space portion 36 is formed so as to communicate with the entire circumference of the corner portion 33 of the bowl body 30. [

An air supply pipe 150 extending from an external air supply source (not shown) is connected to the wall of the bowl body 30 so that air supplied through the air supply pipe 150 is supplied to the upper The air can be introduced into the space portion 36 formed at the rear side of the ring member 110 and the lower ring member 120 and the air introduced into the space portion 36 can be introduced into the space between the upper ring member 110 and the lower ring member 120 120 to the interior of the bowl body 30 and to collect the residual coal within the radius of rotation of the scraper 34. [

On the other hand, the hub 50 of the differentiator 10 is spaced apart from the bowl body 30 and the collecting cylinder 160, and the bottom surface of the collecting cylinder 160 is held in contact with the hub 50. Here, the hub 50 forms the overall contour of the differentiator 10 including the bowl.

At this time, noise is generated while air flows due to a narrow gap between the hub 50 and the bottom of the collecting cylinder 160.

Thus, the collector 160 detachably couples the spacer 210 to the lower side adjacent to the hub 50. A gland 220 is disposed between the spacer 210 and the hub 50 to block or minimize the flow of air.

Particularly, the gland 220 is partly detachably coupled to the lower side of the spacer 210, and the remainder is inserted between the spacer 210 and the hub 50. Of course, the gland 220 is applicable in a variety of shapes and materials.

At this time, the spacer 210 may be detachably coupled to the bottom of the collecting cylinder 160 by a fastening member 230, and the gland 220 may be detachably attached to the spacer 210 by another fastening member 230 Can be combined. Here, the fastening member 230 is a mechanical fastening element such as a bolt.

In addition, a packing 240 is further provided between the hub 50 and the spacer 210. Accordingly, as the air does not flow between the collection cylinder 160 and the hub 50, the generation of the resulting noise is prevented or reduced.

The use state of the underfloor removing apparatus 20 constructed as described above will be described below.

The apparatus for removing residual carbon in the under bowl 20 includes an upper ring member 110 and a lower ring member 120 which are sloped inside the bowl body 30 and air from the outside is supplied into the bowl body 30, The residual coal accumulated in the corner portion 33 of the bowl body 30 is collected toward the center so that the scraper 34 can remove the residual coal in such a manner that the residual coal can be easily scraped off.

The residual coal falling into the lower bowl 20 is accumulated on the bottom of the bowl body 30 by the operation of the differentiator 10 and the accumulated coal is pushed to one side by the rotating scraper 34, Through the outlet 32 in the collecting cylinder 160 and then to the processing facility for processing.

The residual coal falling to the edge region of the bowl main body 30 slides down the upper ring member 110 and the lower ring member 120 having an inclined structure and enters the operating range of the scraper 34, The coal residues present between the member 120 and the scrapers 34 are pushed toward the center by the air and can be processed by the scrapers 34. [

That is, air supplied from an external air supply source (not shown) such as a compressor or the like is introduced into the space portion 36 through the air supply pipe 150, and air is supplied to the upper ring member 110 and the lower ring member The residual coal collected at the lower front side of the lower ring member 120 is pushed by the air pressure and collected into the central region where the scrapers 34 are rotating.

That is, the air that has passed through the upper ring member 110 and the lower ring member 120, which serve as nozzles for jetting air, strongly blows the residual coal, so that the residual coal can be pushed toward the center.

At this time, the air discharged from the upper ring member 110 and the lower ring member 120 is discharged in the same direction as the rotating direction of the scrapers 34 (see FIG. 3), causing a swirl phenomenon, By this swirl action, it is possible to gather more effectively at the center.

As described above, according to the present invention, the combination of the upper ring member 110 and the lower ring member 120 of the air injection type, which is installed in an inclined structure in the corner portion 33 inside the under bowl 20, And a swirl-type air flow, it is possible to simplify the structure and to shorten maintenance time of the differentiator (10) due to the ease of maintenance, The operating rate can be increased.

While the present invention has been particularly shown and described with reference to exemplary embodiments thereof, 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 invention as defined by the appended claims. I will understand. Accordingly, the true scope of the present invention should be determined by the following claims.

10: differentiator 20: under bowl
30: bowl body 32: outlet
33: corner portion 34: scraper
36: Space section 40: Bowl skirt
50: hub 100:
110: upper ring member 120: lower ring member
130: gap 140: gap holding plate
150: Air supply pipe 160: Collection tank
210: spacer 220: gland
230: fastening member 240: packing

Claims (8)

A bowl main body having a discharge port for receiving the coal residues to be dropped and for discharging the coal residues; And a residual coal inducing unit for collecting the coal residues to be dropped into an operating region of a scraper rotated inside the bowl body to transfer the discharged coal to the discharge port side,
Wherein the quartz casting section comprises: an upper ring member extending obliquely downwardly with one side fixed to an inner circumferential surface of the bowl body; And a lower ring member extending obliquely with one side fixed to the bottom surface of the bowl body and overlapping with the upper ring member,
Wherein the upper ring member and the lower ring member form a gap between the upper ring member and the lower ring member such that the upper ring member and the lower ring member can be deformed by the pushing force of the coal residues agglomerated with the scrapers.
delete delete The method according to claim 1,
Wherein the upper ring member or the lower ring member has a gap maintaining plate for holding the gap;
Wherein the bowl main body connects an air supply pipe for supplying and guiding air to remove the coal residues deposited on the inner corner side, the upper ring member, and the lower ring member. .
5. The method of claim 4,
Wherein the gap holding plate is disposed obliquely in the scraper rotating direction to induce a swirl action of the air.
The method according to claim 1,
Wherein at least one of the upper ring member and the lower ring member is provided in the circumferential direction.
The method according to claim 1,
The coal residues discharged from the bowl body are collected in a collection bin;
The collector being removably provided with a spacer on a lower side adjacent to the hub;
Wherein the spacer disposes a gland between the hub and the underbody residual charcoal removing device.
8. The method of claim 7,
And a packing is further disposed between the spacer and the hub.

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