grate bars and grate bar assembly

Abstract

The grate (10) includes: grate plate (1), cooling water passage (2), slipper (3), side plate (4), pin (5), central fixed bearing (6), two side fixed bearings (7), water inlet (8), and drainage passage (9). The grate plate (1) is located on the upper part of the grate (10). The grate plate (1) extends throughout the grate (10) in the surface direction. The grate plate (1) is rectangular when viewed from above. The grate plate (1) is in contact with the combustion material. The surface of the grate plate (1) is constructed of a wear-resistant and corrosion-resistant material. The grate plate (1) is a plate with an integral continuous shape in both the length and width directions.

Description

Technical Field

[0001] This invention relates to grate bars used in incinerators and grate bar assemblies. Background Technology

[0002] Japanese Patent Application Publication No. 2017-078534 discloses refractory-coated grate bars. For example, paragraph 0037 of that publication describes a coal feeder structure comprising a fixed grate bar array and a movable grate bar array arranged side-by-side in the left-right direction. For example, paragraphs 0053 and 0054 of that publication describe a technique for intentionally setting gaps (expansion allowances) between adjacent grate bars.

[0003] Existing technical documents

[0004] Patent documents

[0005] Patent Document 1: Japanese Patent Application Publication No. 2017-078534 Summary of the Invention

[0006] The technical problem that the invention aims to solve

[0007] Previously, as stated in the aforementioned announcement, it was common technical practice to provide grate rows consisting of multiple grate bars arranged side-by-side with a length along the row direction, or to provide gaps between adjacent grate bars. In such cases, ash, waste residue, and other contaminants sometimes leaked from the gaps between the grate bars, and this leakage could cause various problems.

[0008] The present invention provides an improved grate and grate device capable of suppressing the leakage of ash or water.

[0009] Solutions for solving technical problems

[0010] One configuration of the grate includes: a grate plate, which is constructed as an integral continuous shape along its length; a cooling water passage, which is constructed to extend within the surface of the grate plate; a water inlet passage, which is connected to the cooling water passage to allow cooling water to flow in; and a water outlet passage, which is connected to the cooling water passage to discharge cooling water.

[0011] One method of the grate assembly includes: a fixed grate that is at least water-cooled; and a sliding grate that overlaps the fixed grate and moves back and forth to stir solid combustibles on the fixed grate, the fixed grate including a grate plate carrying combustibles, the grate plate being constructed as an integral continuous shape in a length direction intersecting the back and forth direction of the sliding grate.

[0012] Invention Effects

[0013] The continuous shape of the furnace grate can effectively suppress the leakage of ash or water. Attached Figure Description

[0014] Figure 1 This is a perspective view showing the structure of the furnace bars according to the embodiment.

[0015] Figure 2 This is a rear view showing the structure of the furnace bars in the embodiment, along... Figure 1 The dashed line I with arrows in the figure shows a cross-sectional view of the furnace strips cut by the furnace.

[0016] Figure 3 These are (a) a side view, (b) a front view, and (c) a perspective view of the structure of the furnace bars used to illustrate the implementation method.

[0017] Figure 4 This is a perspective view of the cooling water path of the furnace bars used to illustrate the implementation method.

[0018] Figure 5 The figure shows an example of the structure of another furnace strip, (a) is a rear view, (b) is a side view, (c) is a front view and (d) is a perspective view.

[0019] Figure 6 The figure shows an example of the structure of another furnace strip, (a) is a rear view, (b) is a side view, (c) is a front view and (d) is a perspective view.

[0020] Figure 7 This is a diagram showing a grate assembly equipped with grate bars according to an embodiment.

[0021] Figure 8 This is an exploded perspective view showing an example of the internal structure of the grate bars. Detailed Implementation

[0022] Figure 1 This is a perspective view showing the structure of the furnace bar 10 according to the embodiment. Figure 2 It is along Figure 1 The cross-sectional view of furnace bar 10 cut by dashed line I with arrow. Figure 3 These are (a) a side view, (b) a front view, and (c) a perspective view illustrating the structure of the furnace bar 10 in the embodiment.

[0023] Figure 1 The furnace grate 10 of the illustrated embodiment includes: a furnace grate plate 1 and a cooling water channel 2 (see reference). Figure 2 ), 3, slipper; 4, side plate; 5, pin; 6, central fixed bearing; 7, two side fixed bearings; 8, water inlet; and 9, drainage. A grate plate 1 is located on top of the grate 10. The grate plate 1 defines the surface dimensions of the grate 10. The grate plate 1 is rectangular when viewed from above. The grate 10 can also be referred to as a fixed liquid-cooled grate bar.

[0024] Figure 2The cooling water channel 2 shown includes multiple water channels extending within the surface of the grate plate 1. A sliding shoe 3 is located near the front end 1a of the grate plate 1. The sliding shoe 3 protrudes downwards from the grate plate 1. Side plates 4 are respectively located at both ends of the long side of the grate 10.

[0025] Water inlet 8 is a water passage for allowing cooling water to flow into cooling water passage 2. In this embodiment, water inlet 8 is an opening located at one end of the grate 10. Specifically, water inlet 8 is an opening located on the side of the grate 10 (specifically, on the upper part of the slipper 3).

[0026] The drainage passage 9 is a water passage used to discharge cooling water that has undergone heat exchange during the process in the cooling water passage 2. In this embodiment, the drainage passage 9 is an opening in the grate 10 located at the end opposite to the water inlet passage 8. Specifically, the drainage passage 9 is an opening located on the upper surface of the grate 10 (specifically, at the corner of the grate plate 1).

[0027] like Figures 1-3 As shown, the furnace bar 10 has a length dimension L1 along the length direction, a width dimension W1 along the width direction, and a height dimension H1 along the height direction (or thickness direction). The length direction, width direction, and height direction of the furnace bar 10 correspond to the length direction, width direction, and height direction of the furnace bar plate 1, respectively. The furnace bar 10 and the furnace bar plate 1 have a width W1 along the width direction.

[0028] As an example, the length L1 can be from 1500mm to 5000mm. Setting the lower limit of L1 to 1500mm has the advantage of ensuring waste handling capacity and reducing costs. Setting the upper limit of L1 to 5000mm has the advantage of ensuring ease of maintenance and reducing the overall weight of the grate 10.

[0029] As an example, the width W1 of the grate bars 10 and the grate plate 1 can be 500mm to 1000mm. Setting the lower limit of W1 to 500mm has the advantages of ensuring waste handling capacity and reducing costs. Setting the upper limit of W1 to 1000mm has the advantages of ensuring ease of maintenance and reducing the weight of the grate bars 10.

[0030] The grate plate 1 is in contact with the combustion material. The surface of the grate plate 1 is constructed of a wear-resistant and anticorrosive material. The grate plate 1 is a plate with an integral and continuous shape in both the length and width directions. In this embodiment, when viewed along the length direction, the grate plate 1 has no cracks or gaps in the middle. For convenience, in this embodiment, such an integral and continuous shape along the length direction of the grate plate 1 is also referred to as a "whole row integrated structure".

[0031] like Figure 2 As shown, the cooling water passage 2 is provided on the back side of the grate plate 1. As an example, the cooling water passage 2 in this embodiment includes a front-side water passage, a rear-side water passage, and multiple parallel water passage sections. The front-side water passage and the rear-side water passage are respectively provided at the front and rear ends of the grate plate 10 and extend along the length direction of the grate plate 10. The multiple parallel water passage sections connect the front-side water passage section and the rear-side water passage section by extending parallel to the width direction of the grate plate 1.

[0032] Figure 3 The length L1 of the grate 10 shown is designed based on the width of the incinerator. An upper limit can be set for this length L1, which can be, for example, 3 meters (3000 mm) or less. For example, as described later... Figure 7 All the grate bars 10 used in the grate assembly 100 can be less than 3 meters in length L1.

[0033] When setting the furnace bar 10 in the implementation method, such as Figure 3 As schematically shown in (c), the grate bar 10 is inclined at a specific angle θ relative to the horizontal direction. The front end 1a of the grate bar 10 is positioned relatively lower due to its forward inclination. When viewed along the height direction Z relative to the horizontal plane, the opening of the water inlet 8 is positioned relatively lower, and the opening of the drain 9 is positioned relatively higher. In this configuration, cooling water flows in from the lower end of the grate bar 10. The cooling water undergoes heat exchange as it flows through the interior of the grate bar 10. Then, the cooling water that has undergone heat exchange is discharged as warm water from the outlet 9 located at the upper end of the grate bar 10.

[0034] Figure 4 This is a perspective view of the cooling water passage 2 of the grate 10 used to illustrate the embodiment. Figure 4For convenience, the structure of the cooling water passage 2 is schematically illustrated through a perspective view of the furnace grate 1. Multiple arrows FLi, FLm, and FLo schematically represent the flow of cooling water within the cooling water passage 2. Arrow FLi indicates the flow in the front-side water passage section, arrow FLm indicates the flow in the parallel water passage section, and arrow FLo indicates the flow in the rear-side water passage section.

[0035] Cooling water flowing in from water inlet 8 flows along arrow FLi towards the length of grate 10. The cooling water flowing along arrow FLi branches midway into the width direction and flows along arrow FLm towards the rear end of grate 10. The cooling water flowing along arrow FLm receives heat from the grate plates 1, which have become hot due to the incineration of solid waste. When the cooling water reaches the rear end of grate 10 along arrow FLm, it flows again along arrow FLo towards the length. The cooling water finally exits through drain 9 to the outside of cooling water passage 2 along arrow FLo.

[0036] like Figure 2 As shown, the cooling water channel 2 is constructed by welding multiple steel profiles 2a to a steel plate 2b. For example, the steel profiles 2a are channel steel (channel-shaped steel) 2a. The cooling water channel 2 is constructed by welding multiple steel profiles 2a to the steel plate 2b. The shell is constructed from the steel plate 2b and the side plate 4, and multiple channel steels 2a are arranged side-by-side inside the shell. The spacing between adjacent channel steels 2a forms the cooling water channel 2. The cooling water channel 2 forms a fixed frame. The cooling water channel 2 also serves to support the overall structural strength.

[0037] An opening for a water inlet 8 is provided at one end of the grate 10 in the width direction. An opening for a drain 9 is provided at the other end of the grate 10 in the width direction. Cooling water flows in from the water inlet 8 along the long side of the grate 10. The cooling water passage 2 is sealed by the channel steel (i.e., the section steel 2a) and the steel plate 2b, so that the cooling water flows along the width direction of the grate 10. Using the cooling water, the entire grate 10 is cooled by heat exchange. The cooling water, which has been heated by heat exchange, is discharged from the drain 9 and supplied to the cooling tower. The heat of the cooling water can then be reused. Sealed leak-proof devices are provided at the openings of the water inlet 8 and the drain 9, respectively.

[0038] The sliding shoe 3 is made of wear-resistant and corrosion-resistant material. The sliding shoe 3 is installed on the front end 1a of the furnace grate 10 in a removable form.

[0039] like Figures 1-3 As shown, the central fixed bearing 6 and the two side fixed bearings 7 are bearings with a semi-circular open structure 7a. A shaft is mounted on this semi-circular open structure 7a. This structure offers the advantage of easy maintenance.

[0040] Figure 5 as well as Figure 6 An example of the structure of other furnace bars 21, 31 is shown. Figure 5 An example of the structure of a fixed tile 21 used in the solid waste incineration industry is shown. The fixed tile 21 includes a length dimension L2, a width dimension W2, and a height dimension H2. Figure 6 An example of the structure of a sliding tile 31 used in the solid waste incineration industry is shown. The sliding tile 31 includes a length dimension L3, a width dimension W3, and a height dimension H3.

[0041] like Figure 5 As shown in the front view of (c), the front end 21a of the fixed furnace bar 21 has serrated protrusions and convexities. Similarly, as Figure 6 As shown in the front view of (c), the front end 31a of the sliding furnace strip 31 has toothed protrusions and dentations.

[0042] The length dimensions L2 and L3 are each shorter than the length dimension L1 of the furnace grate 10 in this embodiment. For example, the length dimensions L2 and L3 can each be 250 mm, or more than 250 mm, or less than 250 mm. For example, the height dimension H2 can be 120 mm, meaning it can be the same as the height dimension H1. For example, the width dimension W2 can be 680 mm, or more than 680 mm, or less than 680 mm. For example, the width dimension W3 can be 612 mm, or more than 612 mm, or less than 612 mm.

[0043] exist Figure 5 The diagram in (d) shows a connecting grate 20 arranging multiple grate bars 21 in a row. Figure 6 The diagram in (d) shows a connecting grate 30 in which multiple grate bars 31 are arranged in a row. The grate bars 21 and 31 are components (i.e., small pieces or parts) that construct the connecting grate bars 20 and 30. The connecting grate bars 20 are formed by connecting the grate bars 21 together in close contact. Similarly, the connecting grate bars 30 are formed by connecting the grate bars 31 together in close contact. The connecting grate bars 20 and 30 may also have the same length dimension L1 as the grate bar 10.

[0044] Figure 7 This figure illustrates a grate assembly 100 equipped with the grate bars 10 of the embodiment. The grate assembly 100 includes a stepped grate structure in which grate bars 10 and connecting grate bars 30 are alternately stacked along the height direction. The connecting grate bars 30 are sliding connecting grate bars constructed from multiple sliding grate bars 31. When the grate assembly 100 is in operation, the grate bars 10 are fixed. On the other hand, the connecting grate bars 30 move along the width direction (that is, along...). Figure 7The grate 30 is driven back and forth in the direction of the width dimension W1. By reciprocating, the solid combustibles on the fixed grate 10 are stirred by the connecting grate 30. The connecting grate 30 is driven by a hydraulic cylinder or other drive device (not shown) to reciprocate in the direction of waste flow at a constant interval.

[0045] like Figure 7 As shown, a cooling air supply device 102 is provided in the grate assembly 100 of the embodiment. A lower air chamber (not shown) is provided below the grate bars 10 and the connecting grate bars 30 in the grate assembly 100. The cooling air supply device 102 communicates with the lower air chamber. The cooling air supply device 102 supplies air to the lower air chamber for cooling the grate bars 10 and the connecting grate bars 30. It should be noted that... Figure 7 The cooling air supply device 102 is schematically illustrated, but the lower air chamber is omitted. The specific structure of the cooling air supply device 102 can be achieved by combining various known or well-known devices, therefore detailed description is omitted here.

[0046] In the grate assembly 100 of the embodiment, the grate 10 can be cooled simultaneously and doubly using both air and water. That is, when the grate assembly 100 is operating inside the incinerator, cooling water is supplied to the cooling water path 2 of the grate 10. While performing this water cooling, air cooling is also performed by contacting the back of the grate 10 and the back of the grate 30 connected to it.

[0047] The effects of the above-described embodiments will be explained. In this embodiment, the grate plate 1 is a single, integrated structure, a continuous, seamless design along its length. This provides the advantage of suppressing leakage of ash or waste residue downwards from the grate plate 1.

[0048] Here, the effect of the implementation method on suppressing leakage will be explained with comparative examples. The comparative example is a "grate structure consisting of multiple grate bars arranged side by side". When multiple grate bars are arranged side by side, gaps inevitably occur between adjacent grate bars. For example, if more than 10 grate bars (grate blocks) are connected along the column direction to construct a water-cooled grate bar of a certain length, ash, waste residue, or water may leak from the gaps between adjacent grate bars. Even if multiple grate bars (or grate plates) are arranged in close contact without gaps, it is impossible to completely eliminate the gaps between multiple grate plates. For example, this is because the grate bars undergo thermal shrinkage when used in high-temperature environments. In addition, each grate plate has design tolerances, and the end faces that abut each other are warped or uneven.

[0049] This disclosure focuses on various problems arising from the gaps between the grate bars. Specifically, when burning highly volatile and low-melting-point materials, the rapidly burning material, when molten, easily drips through the gaps between the water-cooled grate bars. As the dripping molten material is rapidly cooled by the water-cooled grates, it solidifies into coke. Through repeated melting, dripping, and solidification, a hard coke layer rapidly forms on the water-cooled grate bars. As wear between the grate bars increases, the normal ash fall is hindered. Over time, a thick coke layer may accumulate across the entire water-cooled grate. When this phenomenon accumulates, it has a negative impact on combustion performance and can easily damage the water-cooled grate bars. There is also a problem of reduced water cooling effectiveness, making it difficult to effectively control the overall temperature of the grate bars. Furthermore, there is a problem of shortened grate lifespan due to overheating of the grate surface.

[0050] Here, refer to Figure 5 as well as Figure 6 The other furnace bars 21 and 31 are shown. Even if multiple furnace bars 21 and 31 are made to be in close contact along the column direction, tiny gaps will remain between the two contacting end faces, and the furnace bars 21 and 31 will undergo thermal expansion and contraction respectively. Therefore, it is impossible to completely seal the gaps at the boundaries of multiple furnace bars 21 and 31. Especially at high temperatures, water is prone to leaking from these gaps. Due to water leakage, there are problems that hinder normal operation, for example, when the furnace needs to be stopped.

[0051] In this respect, according to the embodiment of the grate 10, the grate plate 1 is a whole row integrated structure. In the embodiment, the grate 10 is constructed as a continuous integral shape along its length, thus avoiding the aforementioned "grate gaps," thereby solving various problems caused by such gaps (such as ash or water leakage). Furthermore, according to the embodiment of the grate assembly 100 (see...) Figure 7 Even if water or ash leaks from the gaps between multiple grate bars 31 to the bottom of the connecting grate bars 30, the water or ash can be caught by the grate bars 10 directly below.

[0052] In addition, according to the implementation method, such as Figure 3As schematically shown in (c), the grate bars 10 are inclined at a specific angle θ. Due to this structure, which allows cooling water to flow upwards from below, even under harsh conditions where the cooling water vaporizes inside the cooling water passage 2, the steam can easily and smoothly move vertically upwards. This avoids situations where air resistance affects the cooling effect. It should be noted that a vent valve can also be installed in the pipe of the drain passage 9 that discharges warm water. To ensure that the grate bars 10 are always kept in a water-cooled state, they can also be filled with water from the very beginning during startup.

[0053] Additionally, according to the embodiment, a wear-resistant slipper 3 is provided at the front end 1a of the grate 10. The slipper 3 interacts with the sliding grate below (e.g., the grate itself). Figure 7 The connecting grate 30 is in repeated contact. The slipper 3 wears down due to this repeated contact. In other words, the wear-resistant slipper 3 is a consumable. According to the embodiment, even if wear intensifies, only the slipper 3 can be replaced locally and non-destructively, rather than replacing the entire air-water mixed-cooling grate 10. This significantly reduces maintenance costs.

[0054] Furthermore, in this embodiment, the furnace bars 10 and the cooling water channels 2 are integrated into a single design. This eliminates the need for connecting components that link multiple water-cooled furnace bars (and their cooling water channels). Connecting components can sometimes cause leaks. In this embodiment, connecting components can be omitted, thus effectively suppressing leaks.

[0055] Furthermore, in this embodiment, the water inlet 8 and the drainage outlet 9 are located at both ends of the long side of the grate 10. Therefore, the cooling water inlet and outlet are not located in the lower air chamber of the grate 10, but are located outside the lower air chamber. Even if a leak occurs at the cooling water inlet and outlet, it has the advantage of not completely stopping the grate assembly and being easy to repair.

[0056] In the case of using a grate structure consisting of multiple water-cooled grate bars arranged in parallel, a "waterway connection component" is needed to connect the cooling water channels in order to inject cooling water into each grate bar. This waterway connection component can leak when its airtightness decreases in a high-temperature, corrosive environment. When leakage occurs, the grate assembly needs to be stopped and repaired after complete cooling. Stopping the grate assembly leads to a decrease in operational efficiency. In this respect, the embodiment has the advantage of simultaneously solving all the problems listed above.

[0057] Furthermore, the grate assembly 100 according to the embodiment provides an air-water hybrid dual cooling grid structure. The use of both air and water cooling methods has the advantage of effectively cooling the grate plates 1. It also has the advantage of rapidly removing surface heat from the grate plates 1. This results in the ability to reduce the actual temperature of the grate plates 1. Consequently, it has the advantage of enabling all components of the grate assembly 100 to operate efficiently as a whole. It also has the advantage of easily extending maintenance periods and achieving energy-saving effects.

[0058] In this embodiment, the cooling water channel 2 is constructed by welding channel steel and steel plate, and does not include U-shaped pipes. U-shaped pipes have the disadvantages of low cooling efficiency and the generation of water bubbles. Compared with the case using U-shaped pipes, this embodiment has the advantages of high cooling efficiency and easy drainage of water bubbles even if they are generated.

[0059] In the field of incinerators for burning solid waste such as municipal solid waste, biomass, or industrial waste, with the improvement of people's living standards and the acceleration of civilization, waste classification has become increasingly detailed. Consequently, the calorific value of the waste being burned is constantly increasing. Regarding the grate bars used in incinerators, there are air-cooled grate bars and water-cooled grate bars. Air-cooled grate bars have low cooling performance. Therefore, purely air-cooled grate bars cannot be used in environments with calorific values ​​exceeding 2000 kcal / kg. In this regard, the grate bar 10 of the embodiment features an air-water hybrid dual-cooling grid structure, solving the problem of purely air-cooled grids and providing a grate bar structure capable of handling a wider range of solid waste calorific values. According to the embodiment, a grate bar 10 suitable for withstanding calorific values ​​exceeding 2000 kcal / kg is provided.

[0060] For example, the furnace bar 10 may include Figure 8 The internal structure shown. Figure 8 An exploded perspective view showing an example of the internal structure of the grate 10. Figure 8 In this example, as a variation, the steel section 2a is not a channel steel 2a, but other steel sections 2a. Thus, the steel section 2a can also be a steel section with any arbitrarily divided cross-sectional shape.

[0061] The implementation can be adapted to various modifications (improvements) described below. Several modifications are illustrated below, but one or more arbitrary modifications can also be combined based on these sets of modifications.

[0062] The length dimension L1 of the furnace bar 10 and the length dimensions L2 and L3 of the other furnace bars 21 and 31 can be modified in various ways. The values ​​of L1 to L3 can be set such that the value of length dimension L1 is an integer multiple of the values ​​of length dimensions L2 and L3. Therefore, when connecting multiple furnace bars 21 and 31 to construct connecting furnace bars 20 and 30, it is easy to construct connecting furnace bars 20 and 30 with furnace bars 10 of equal length. However, this is not a limitation; the value of length dimension L1 may not be an integer multiple of the values ​​of length dimensions L2 and L3.

[0063] Regarding the width dimension W1 of the furnace bar 10 in the embodiment, and the width dimensions W2 and W3 of the other furnace bars 21 and 31, various modifications can be made. For example, the width dimension W2 can be 680 mm, but it can also be 680 mm or more, or less than 680 mm. For example, the width dimension W3 can be 612 mm, but it can also be 612 mm or more, or less than 612 mm. The width dimension W2 can be the same as the width dimension W1 (that is, W2 = W1), but as a modification, it can also be W2 < W1 or W2 > W1.

[0064] The height dimension H1 of the furnace bar 10 and the height dimensions H2 and H3 of the other furnace bars 21 and 31 can each be modified in various ways. For example, the height dimension H3 can be 120 mm, but it can also be 150 mm. That is, the height dimension H3 can be the same as the height dimensions H1 and H2, but as a variation, H3 can be greater than H1. The height dimension H2 can be the same as the height dimension H1 (that is, H2 = H1), but as a variation, H2 can be less than H1 or H2 greater than H1.

[0065] The specific shape of the cooling water channel 2 is not limited and can be modified in various ways. For example, the cooling water channel 2 can be modified to include one or more tortuous water channels. In one embodiment, the cooling water channel 2 is constructed as a continuous water channel within the surface of the grate plate 1 without water channel connecting the workpiece. However, as a variation, the cooling water channel 2 can be divided into multiple water channels midway along the length of the grate plate 1, and the discontinuities in the water channels can be connected by water channel connecting the workpiece. In addition, the positions of the water inlet channel 8 and the water outlet channel 9 can be arbitrarily changed according to the structure of the cooling water channel 2. In one embodiment, the water inlet channel 8 is disposed at one end of the grate plate 10, and the water outlet channel 9 is disposed at the other end of the grate plate 10 on the opposite side. However, as a variation, the water inlet channel 8 and the water outlet channel 9 can also be concentrated at one end of the grate plate 10.

[0066] As a variation, the slide shoe 3 can be integrated in a form that cannot be removed from the periphery of the front end 1a of the grate plate 10. Alternatively, the slide shoe portion can be integrated with the front end 1a of the grate plate 1.

[0067] As a variation, the central fixed bearing 6 and the two side fixed bearings 7 can be annular openings such as circles. A shaft can be inserted through these circular openings.

[0068] The grate 10 can be used as a fixed grate or a sliding grate.

[0069] Explanation of reference numerals in the attached figures

[0070] 1. Furnace grate plate

[0071] 1a, 21a, 31a Front end

[0072] 2 Cooling water circuit

[0073] 2a type steel (channel steel)

[0074] 2b steel plate

[0075] 3. Slipper boots

[0076] 4 side panels

[0077] 5. Pins

[0078] 6. Central fixed bearing

[0079] 7. Fixed bearings on both sides

[0080] 7a Semi-circular open structure

[0081] 8 waterway

[0082] 9. Drainage channel

[0083] 10 furnace bars

[0084] 20 Connecting grate bars (connecting fixed grate bars)

[0085] 30 Connecting grate bars (connecting sliding grate bars)

[0086] 21. Furnace bars (fixed furnace bars)

[0087] 31. Sliding furnace bars (sliding furnace bars)

[0088] 100 grate rack assembly

[0089] 102 Cooling air supply device

[0090] FLi, FLm, and FLo are arrows indicating the flow of cooling water.

[0091] Height dimensions H1, H2, H3

[0092] L1, L2, L3 length dimensions

[0093] Width dimensions of W1, W2, and W3

[0094] Z-axis

[0095] θ is the inclination angle of the grate bars.

Claims

1. A grate bar which is arranged obliquely with respect to the horizontal direction, wherein The grate includes: a grate plate having a continuous shape in a length direction and a width direction; a cooling water path configured to extend in a surface of the grate plate; a shoe provided at a front end of the grate plate and protruding downward of the grate plate; side plates respectively provided at both ends of a long side of the grate; a water inlet path provided at a portion of a side surface of the shoe close to the grate plate and connected to the cooling water path to allow cooling water to flow in; and a water outlet path provided at an end of the other side opposite to the water inlet path, that is, a corner portion of an upper surface of the grate plate, and connected to the cooling water path to discharge the cooling water, the grate plate has a rectangular shape when viewed from above, the cooling water path is divided by a partition between the grate plate and a steel plate facing each other, and a space divided by the partition is used as a water path of the cooling water to contact the entire back surface of the grate plate.

2. The grate according to claim 1, wherein the cooling water path is formed by welding the steel plate and a profile steel as the partition.

3. The grate according to claim 1 or 2, wherein the cooling water path includes a plurality of water paths extending in parallel in the width direction of the grate plate.

4. The grate according to claim 1, wherein the length of the grate plate is 1500 mm to 5000 mm.

5. The grate according to claim 1, wherein the width of the grate plate is 500 mm to 1000 mm.

6. The grate according to claim 1, wherein a detachable wear-resistant shoe is provided at one side of the front end of the grate plate.

7. The grate according to claim 1, wherein the grate plate has a uniform structure of a plate having a surface constructed of a wear-resistant corrosion-resistant material.

8. The grate according to claim 1, wherein an intermediate fixed bearing is provided at a middle of the length direction of the grate plate, both end fixed bearings are provided at both ends of the length direction of the grate plate, the intermediate fixed bearing and the both end fixed bearings include a semi-circular open structure.

9. A grate bar arrangement, wherein, including: a grate loaded with solid fuel; and a sliding grate overlapping the grate in a length direction of the grate and stirring the solid fuel loaded in the grate by reciprocating displacement, in the grate device, the grate is provided to be inclined with respect to a horizontal direction and a front end of the grate is located at a position relatively lower due to the inclination to the front, and includes: a grate plate having a continuous shape in a length direction and a width direction; a cooling water path configured to extend in a surface of the grate plate; a shoe provided at a front end of the grate plate and protruding downward of the grate plate; side plates respectively provided at both ends of a long side of the grate; a water inlet path provided at a portion of a side surface of the shoe close to the grate plate and connected to the cooling water path to allow cooling water to flow in; and a water outlet path provided at an end of the other side opposite to the water inlet path, that is, a corner portion of an upper surface of the grate plate, and connected to the cooling water path to discharge the cooling water, the grate plate has a rectangular shape when viewed from above, The cooling water path separates the mutually facing furnace bar plate and steel plate with a partition, and uses the space separated by the partition as a water path for cooling water to contact the entire back surface of the furnace bar plate.

10. The furnace bar device according to claim 9, wherein a cooling air supply device that supplies cooling air to the back surface of the furnace bar and the sliding furnace bar is further included in the water cooling of the furnace bar, The sliding furnace bar is arranged in parallel with a plurality of furnace bar pieces in the length direction.

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