KR200439982Y1 - Fire grate - Google Patents

Abstract

The present invention is arranged in the waste incinerator in the width direction while alternately cascaded alternately in the waste conveying direction to form an incineration treatment table, and extends from a rectangular body in the horizontal direction, the front end and the left and right ends of the main body; A grate comprising a shear wall and left and right sidewalls, the upper surface of the main body adjacent to the shear wall, characterized in that a plurality of projections having a vertical surface extending from the front surface of the shear wall and the inclined surface toward the rear is formed spaced apart from each other, According to the configuration of the present invention, it is possible to improve the conduction of waste in the incinerator, the durability of the grate, and the combustion efficiency.

Grate, protrusion, slope, shear wall, recess, abrasion, high temperature corrosion

Description

Grate {FIRE GRATE}

BRIEF DESCRIPTION OF THE DRAWINGS The front view which shows the typical structure of the waste conveying apparatus by which the conventional grate was cascade | arranged in an incinerator.

FIG. 2 is a perspective view of an incineration treatment stand of the waste conveying apparatus of FIG. 1. FIG.

3 is a waste or combustion product is loaded on the grate during the incineration process, the waste is dropped due to the inclination of the front end portion exposed to the flame (part A), the wear of the grate load and the reciprocating motion occurs (part B) A diagrammatic representation of the problem.

Figure 4 is a perspective view showing the structure of the grate according to the first embodiment of the present invention.

Figure 5 (a), (b) and (c) is a plan view, front view and side view of the grate according to the present invention shown in Figure 4, respectively.

Figure 6 is a perspective view showing the projection of the grate according to the second embodiment of the present invention.

7 is a perspective view showing the shape of the projection of the grate according to the third embodiment of the present invention.

** Explanation of symbols for main parts of drawings **

10: Grate 12: Moving Grate

14: fixed grate 20: main body

30: shear wall 40: rear wall

50: side wall 52: recess

60: mounting groove 80: protrusion

82: inclined plane 84: vertical plane

90: waste 100: support rod

110: hydraulic cylinder 120: moving frame

130: fixed frame

The present invention relates to a grate of an incinerator for incineration of waste (living waste, industrial waste, infectious waste, etc.), and more specifically, a mobile grate column and a fixed grate column are alternately arranged at a lower side of the waste incinerator. An incinerator grate for reciprocating in contact with the upper surface of the main body of the fixed grate on the downstream side of the shear wall.

In the treatment of wastes such as household wastes and industrial wastes, a method of incineration of wastes in the incinerator is most commonly employed, and the waste put into the incinerator is completely burned by a process such as drying, combustion, and post-combustion. Below the incinerator for this use, a stocker type conveying apparatus including heat-resistant / wear-resistant metal grate is provided.

1 is a schematic view showing a typical structure of a waste conveying apparatus, wherein the waste conveying apparatus comprises an incineration treatment table composed of a plurality of grate 10 and various supporting devices for supporting or reciprocating the grate 10.

The grate 10 constituting the incineration treatment table is connected to the moving grate 12 and the fixed frame 130 connected to the moving frame 120 reciprocating by a driving device such as the hydraulic cylinder 110 according to the movable property. Although divided into the fixed grate 14, typically the grate of the same structure is used for the mobile grate 12 and the fixed grate (14).

These grate 10 (12, 14) is arranged in a stepwise form in a row in the width direction (direction perpendicular to the ground in Fig. 1), waste or combustion products loaded on the incineration treatment by the reciprocating motion of the moving grate 12 It is conveyed gradually to the downstream side (right side of FIG. 1).

2 is a perspective view showing a part of an incineration treatment table made of grate. Each grate 10 includes a main body 20 extending in the horizontal direction, a front wall 30, a rear end wall 40, and a side wall 50 extending in the vertical direction from the front, rear, left, and right ends of the main body 20. Equipped. The rear end wall 40 of the grate is formed with a mounting groove 60, the mounting groove 60 is connected to the support rod 100 of the frame to support the grate.

During incineration, waste or combusted products are brought into contact with the main body 20 and the shear wall 30 of the grate while moving downstream on the incineration treatment, and the main body 20 can be smoothly conveyed to the downstream side of the grate 10. ) And the connecting portion 25 between the shear wall 30 is generally designed to achieve a predetermined radius of curvature.

However, in the case of the incineration treatment table using the conventional grate 10, in the vicinity of the connecting portion 25 between the main body 20 and the shear wall 30, the waste stays only for a very short time and moves directly to the incineration treatment below. In addition, the connection portion 25 of the grate has a problem in that the corrosion is accelerated by continuous direct exposure to the corrosive combustion gas and the flame inside the incinerator during the incineration operation.

FIG. 3 is an enlarged view of the portion indicated by the circle of FIG. 1, showing the state in which the waste 90 is loaded on the grate 10 during the incineration process, and schematically illustrating phenomena related to wear of the conventional grate as described above. Is showing. That is, the main wear parts of the grate are the upper surface and the front part of the main body, and the upper surface of the main body is worn by friction and the weight of the grate due to the relative movement between the grate, and the waste 90 is caused by the inclination at the front end. By falling, the front part is exposed to a flame, causing deterioration.

In addition, the grate 10 having the structure shown in FIGS. 1 to 3 has a problem that the efficiency of pressurizing and conveying waste or combustion products is low, and the combustion efficiency is low because stirring of the waste is not sufficiently performed during incineration.

Referring again to FIG. 2, an air flow path is formed by a lower space partitioned by the main body 20 and the side walls 50 of the grate 10, and in the conventional grate, the air flow path is typically supplied through the air flow path. Air nozzles 22, 24, 32 for supplying air into the incineration chamber are perforated in a circular or slit shape on the main body 20 and the front wall 30.

When the air nozzle for supplying air is formed on the front wall 30 of the grate 10 in this way, if the air is supplied excessively, high temperature corrosion proceeds at the air nozzle 32 and the durability of the grate is considerably reduced. There is also a problem.

The object of the present invention for solving the problems of the conventional grate as described above is to extend the service life by improving the shape of the front end of the grate.

Another object of the present invention is to shorten the burning time of the waste and further increase the combustion efficiency by conducting or stirring the waste during incineration.

Another object of the present invention is to reduce the high temperature corrosion of the grate itself by changing the air flow path from the grate to the waste.

While most of the surface of the grate is covered with waste during operation of the incinerator, it is not directly exposed to the flame, but the tendency of the grate's body and the shear wall boundary is easy to be exposed, and the tendency increases even when the radius of curvature of the boundary is large. As a result, it has been found that corrosion and abrasion are promoted by a high-temperature corrosive atmosphere, and as a result of earnestly examining the structure of the grate for further improving combustion efficiency, the present invention has been achieved.

The gist of the present invention is as follows.

(1) in a waste incinerator, arranged stepwise alternately in the waste conveying direction while forming heat in the width direction to form an incineration treatment table, a rectangular body in the horizontal direction, and a shear wall extending from the front and left and right ends of the body; In the grate comprising a left and right side wall,

The upper surface of the main body adjacent to the shear wall, the grate characterized in that a plurality of projections having a vertical surface extending from the front surface of the shear wall and the inclined surface toward the rear are formed spaced apart from each other.

(2) The grate according to (1), wherein the inclined surface and the vertical surface of the protrusion are connected by a horizontal surface or an arcuate curved surface.

(3) The grate according to (1) or (2), wherein the plurality of projections start to rise in front of the maximum forward position of the shear wall of the grate adjacent to the upstream side.

(4) The grate according to (1) or (2), wherein one or both of the left and right side walls are formed with one or more recesses extending from the bottom to the top of the side walls to be used as air passages.

<Preferred embodiment>

Hereinafter, preferred embodiments of the present invention will be described in detail with reference to FIGS. 4 to 7 of the accompanying drawings.

4 is a perspective view of a first embodiment of the grate according to the present invention, Figure 5 shows (a) a plan view, (b) front view and (c) side view of the grate according to FIG. 6 and 7 show the shape of the projections of the second and third embodiments of the grate according to the present invention, respectively. 4 to 7 are for illustrating the embodiments of the present invention, and the present invention is not limited to the embodiments shown in the drawings.

Among the parts of the grate according to the present invention shown in FIGS. 4 to 7, the same reference numerals are used for parts common to those of the conventional grate of FIGS. 1 to 3, and description thereof will be omitted.

In the present invention, the smaller the radius of curvature at the boundary between the main body 20 and the shear wall 30 of the grate 10, more preferably at least the upwardly inclined structure toward the front end of the main body 20, the incinerator Based on the finding that the grate is easily shielded from the high temperature oxidizing atmosphere during operation, the structure of the grate which can secure such shielding effect and improve the combustion efficiency and agitation effect of waste or combustion products is examined.

The grate 10 of the present invention according to the result of the examination, as shown in FIGS. 4 to 7, protrudes upward from the boundary of the main body 20 and the shear wall 30 and its vicinity and extends in the width direction. A plurality of protrusions 80 are spaced apart from each other. More specifically, the plurality of protrusions 80 have a vertical surface 84 extending from the front surface of the shear wall 30 and an inclined surface 82 facing backward.

When the projection 80 of the grate is viewed in the side wall direction, the shape is triangular or approximately triangular, and in consideration of safety in handling, the right angle portion of the triangular projection 80 is cut into a sawtooth shape by cutting in the direction parallel to the horizontal plane. In addition, the inclined surface 82 and the vertical surface 84 may be connected by being rounded and arcuate.

The shape of the inclined surface 82 of the protrusion 80, the interval of the protrusion 80, and the like are not particularly limited in the present invention, and may be selected in consideration of the transport efficiency and the stirring effect of the waste. For example, the structure may be simplified by making the inclined surface 82 of the protrusion a plane of a predetermined inclination, but the inclination gradually increases toward the rear from the point where the elevation starts on the top surface 20 of the grate 10 and then inclines again. Various embodiments are possible, such as is reduced to a curved surface connected to the vertical surface 84.

In addition, the shape of the side surface of the inclined surface 82 is not particularly limited, but when considering the removal of foreign matter between the projections and the convenience of management of the grate, the third embodiment of the embodiments illustrated in FIGS. 4 to 7 The shape of the projections is particularly preferred.

Next, the height of the projection 80 and the inclination of the inclined surface 82 will be described with reference to FIGS. 4 and 5.

Typically, the size of the grate 10 used in the incinerator is about 550 mm to 650 mm in length, about 220 mm to 240 mm in width, and about 80 mm to 100 mm in height. A grate is used (to be described later), and the height of the projection 80 is preferably 10 mm to 30 mm. If the height of the projection is less than 10 mm, it is difficult to form a layer of the combustion material having a thickness effective for shielding the front end portion of the main body 20, the stirring effect of the combustion product does not sufficiently occur, and if it exceeds 30 mm, it acts as a barrier to the waste conveyance. It is not desirable to do so.

In addition, in the case of a grate having the shape of the protrusion 80 as shown in FIG. 4, the angle between the inclined surface 82 of the protrusion 80 and the upper surface of the main body 20 is preferably 5 degrees to 30 degrees. During the reciprocating motion of the grate 10, the lower surface of the shear wall 30 of the upstream grate 10 and the inclined surface 82 of the downstream grate 10 should be configured so as not to interfere with each other, the upper surface of the main body 20 The position at which the inclined surface 82 starts to be raised from the front side should be located at the front side than the point of contact with the main body of the fixed grate 14 on the downstream side in the maximum advance state of the moving grate 12. Due to these constraints, if the inclined surface is less than 5 degrees, the height of the projections becomes low, making it difficult to form a layer of combusted material having a sufficient thickness to shield the front end of the main body 20, and if it is larger than 30 degrees, Excessive disturbances are undesirable.

Even in the case of employing a grate as in the embodiment of Fig. 6 and Fig. 7, the height of the projection 80 and the inclination of the inclined surface 82 are appropriately adjusted in consideration of the correlation between the layer thickness of the combustion product and the movement of the combustion product. Those skilled in the art can readily understand that the present invention can be used.

Since the waste conveying apparatus in the incinerator in which the grate 10 according to the present invention is used has the same structure as in FIGS. 1 and 3, the operation of the protrusion 80 according to the present invention will be described below with reference to FIGS. 1 and 3. Shall be.

In the grate 10 according to the present invention, as in the conventional grate 10, the grate 10 is separated into a row of moving grate 12 and a fixed grate 10, and are arranged in parallel in the width direction, respectively, and the grate grate 12 and the grate grate 14 are fixed. Each of the rows is mounted on the support rod 100 provided on the moving frame 120 and the fixed frame 130 of the waste conveying apparatus.

By the forward and backward reciprocating movement of the moving frame 120, the lower end of the front end wall 30 of the row of moving grate 12 contacts the main body 20 of the row of the fixed grate 14 located downstream, and reciprocates relatively. The main body 20 of the row of moving grate 12 is in reciprocating contact with the lower end of the shear wall 30 of the row of fixed grate 14 located upstream. Accordingly, the waste or combustion products loaded in the grate 10; 12, 14 rows is pressurized by the shear wall 30 of the grate 10 and transported downstream.

According to a feature of the present invention, a plurality of projections 80 protruding while being inclined from the horizontal plane in the upper region of the main body 20 reaching the shear wall 30 at a predetermined distance from the shear wall 30 of the grate 10. ) Is formed so that a portion of the waste or combusted products may be retained in the upstream grate row during the process of sequentially transporting the waste grate 10 from the upstream grate 10 row to the downstream grate 10 row.

In this case, in the process of reciprocating the row of grate 10, even if the waste or combustion products loaded in the grate 10 row is pressed by the shear wall 30 of the row of grate 10 located upstream, a part of the projection 80 It is not disturbed and conveyed to the grate 10 on the downstream side, and remains at least until the next cycle of the reciprocating motion.

Subsequently, the waste or the combustion products remaining in the projection 80 is pressurized by the waste or the combustion products carried from the row of the grate 10 on the upstream side by the reciprocating motion of the next cycle and transported to the grate 10 on the downstream side to be replaced. do. As a result, the protrusions 80 are always blocked and protected from corrosive gas, such as flame, and corrosive gas inside the incineration chamber by waste, thereby significantly reducing the rate of wear damage caused by corrosion.

In addition, according to the configuration in which the plurality of protrusions 80 are formed on the main body 20 of the grate 10, a space is formed by the interval between the plurality of protrusions 80, which affects the waste incineration, thereby improving combustion efficiency. Can be.

That is, due to the difference between the height of the projection 80 and the height of the upper surface of the main body 20, the fluctuation of the combustion product up and down or conduction during the reciprocating motion of the grate 10 is stirred, in particular, the portion where the projection 80 passes and Due to the difference in the height of the part where the gap passes and the path difference therebetween, the waste is also agitated in the left and right directions, thereby improving the overall stirring efficiency and ultimately increasing the combustion efficiency.

In order to cope with such an improvement in the combustion efficiency, it is preferable to be accompanied by an improvement in the conveyance efficiency of the waste, but in the incineration treatment table employing the grate 10 according to the present invention, the vertical surface 82 of the projection 80 facing the downstream side and The front surface of the front wall 30 serves to pressurize the combustion products, thereby increasing the conveyance efficiency.

According to a more preferred embodiment of the present invention, in order to prevent the high temperature corrosion phenomenon in the air nozzle overlaps with the wear of the main body by friction or the front end due to exposure to the corrosive environment, the deterioration phenomenon is accelerated, grate 10 It is preferable that the recess 52 is formed in the side wall 50 of the side wall and only the air is supplied by the recess 52. To this end, the widthwise dimension of the grate 10 may be reduced, and the air supply may be made from the connection portion of the grate 10 and the grate 10.

One or more of the recesses 56 may be disposed on at least one of the left and right sidewalls 50 of the grate 10 to provide a passage of air, and according to this preferred embodiment, high temperature corrosion occurring in the grate itself Wear can be minimized.

As described above, the preferred embodiment of the present invention has been described, but the scope of the present invention is not limited to the above embodiment, and various modifications are possible without departing from the essential and essential configuration of the present invention. Accordingly, the embodiments described above are merely illustrative and not intended to have a limiting meaning, and the scope of the present invention should be understood to include the matters set forth in the appended claims and all modifications that may be understood therefrom. .

According to the configuration of the present invention, by forming a projection at the front end of the upper surface of the grate, it is possible to achieve the conduction of waste, the durability of the grate, and the combustion efficiency. The waste always stays on these serrated protrusions, thereby reducing the exposure to the flame, thereby affecting durability, and forming spaces between the protrusions, which affects the incineration of the waste, thereby improving combustion efficiency.

Claims (4)

The waste incinerators are arranged stepwise alternately in the waste conveying direction while forming heat in the width direction to form an incineration treatment table, and have a rectangular body in the horizontal direction, shear walls extending from the front ends and the left and right ends of the main body, and the left and right side walls. In the grate comprising a, The upper surface of the main body adjacent to the shear wall, the grate characterized in that a plurality of projections having a vertical surface extending from the front surface of the shear wall and the inclined surface toward the rear are formed spaced apart from each other. The method of claim 1, The inclined surface and the vertical surface of the projection grate, characterized in that connected by a horizontal surface or arcuate curved surface. delete The method according to claim 1 or 2, The grate according to one or both of the left and right side walls, at least one recess formed from the lower side to the upper side of the side wall is used as an air flow path.

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