Low-resistance efficient L-shaped grid plate

Abstract

The invention relates to the technical field of the building material industry, aims to solve the problems of poor quenching heat exchange, low heat recovery efficiency, poor process index, high energy consumption, high discharging temperature, low strength, poor grindability, short service life, high maintenance cost, poor air uniformizing capacity and poor cooling effect in the prior art, and provides a low-resistance and high-efficiency L-shaped grid plate which comprises a plurality of grid plate groups, each grid plate group is provided with a first grid section and a second grid section, a wave arc surface is arranged between the long edge of each first grid section and the short edge of each first grid section, and a first horizontal section and a first upper arc surface are arranged between the long edge of each second grid section and the short edge of each second grid section; a plurality of third grate bars which are staggered, overlapped and uniformly distributed are arranged between the first grate bars and the second grate bars, and cooling air ducts are arranged between the adjacent third grate bars. The invention has the beneficial effects of streamline smoothness, low resistance, good quenching heat exchange, high heat recovery efficiency, good process index, low energy consumption, low discharge temperature, good grindability, long service life, low maintenance cost, good air uniformizing capability and good cooling effect.

Description

Technical Field

[0001] The invention relates to the technical field of building materials industry, and in particular to a low-resistance and high-efficiency L-shaped grate plate. Background Art

[0002] In the building materials industry, grate coolers are often used to cool high-temperature clinker, and the main component that controls the cooling function of the grate cooler is the grate plate. Under the grate plate is the cooling air chamber, and on the grate plate is the high-temperature clinker. The cooling air passes through the gaps in the grate plate and enters the high-temperature clinker for heat exchange cooling. Obviously, the grate plate controls different key factors such as the wind speed, wind direction, and air volume of the cooling air. These factors will have a great impact on the heat exchange efficiency of the high-temperature clinker. Therefore, studying the grate plate has very important practical significance.

[0003] The grate plates currently in use are of various forms and have different performances. The existing grate plates and heat exchange methods are difficult to adapt to the new requirements of the fourth-generation grate cooler. The existing grate plates have poor wear resistance and a short service life, so frequent replacement of grate plates affects production and has high maintenance costs; the air outlet direction is unreasonable, the heat exchange path is short, the turbulence level is low, it is not easy to break the critical layer between gas and solid, the rapid cooling heat exchange efficiency is low, the discharge temperature is high, the clinker is not quickly cooled, and the quality and grindability are very poor.

[0004] Therefore, the reasonable design of grate plate and efficient heat exchange method have a very important influence on the rapid cooling heat exchange, clinker strength, wear resistance life, resistance power consumption, etc. of grate cooler. On the contrary, unreasonable grate plate structure will reduce the process index of grate cooler, and even further affect the energy saving, consumption reduction, emission reduction and waste heat recovery of the whole firing system. Summary of the invention

[0005] The present invention aims to provide a low-resistance and high-efficiency L-shaped grate plate to solve the problems in the prior art of poor rapid cooling heat exchange, low heat recovery efficiency, poor process index parameters, high energy consumption, high discharge temperature, low strength, poor wear resistance, short service life, high maintenance cost, poor air distribution capacity and poor cooling effect.

[0006] The embodiment of the present invention is achieved as follows:

[0007] The embodiment of the present invention provides a low-resistance and high-efficiency L-shaped grate plate, which includes a plurality of grate plate groups;

[0008] A plurality of the grate plate groups each have a first grate bar and a second grate bar, wherein the first grate bar and the second grate bar are parallel to and spaced from each other;

[0009] The first grate bar and the second grate bar are both L-shaped structures, a wavy arc surface is provided between the long side of the first grate bar and the short side of the first grate bar, a first horizontal section and a first upper arc surface are provided between the long side of the second grate bar and the short side of the second grate bar, and the first horizontal section is connected to the first upper arc surface;

[0010] A plurality of third grate bars are arranged between the first grate bars and the second grate bars, the plurality of third grate bars are mutually staggered and overlapped and evenly distributed, and a cooling air channel is provided between adjacent third grate bars.

[0011] When in use, the cooling air generated by the cooling air chamber passes through the gaps between the first grate bar, the second grate bar and several of the third grate bars in the grate plate group and enters the high-temperature clinker for heat exchange cooling. The wavy curved surface, the first horizontal section, the first upper curved surface and the cooling air duct can all guide the air smoothly, so that the cooling air forms an air cushion on the top surface of the grate plate group.

[0012] A low-resistance and high-efficiency L-shaped grate plate disclosed in the present embodiment has the beneficial effects of streamlined and smooth low resistance, good rapid cooling and heat exchange effect, high heat recovery efficiency, good process index parameters, low energy consumption, low discharge temperature, high discharge strength, high discharge wear resistance, long service life, low maintenance cost, good wind distribution ability and optimal cooling effect, by virtue of the reasonable design of the above-mentioned grate plate group.

[0013] Optionally: the upper parts of the plurality of the third grate bars have a second horizontal section and a third horizontal section, and a second upper arc surface is provided between the second horizontal section and the third horizontal section;

[0014] The lower parts of the plurality of third grate bars have a third lower arc surface, and the third lower arc surface is located at the lower part of the third horizontal section.

[0015] With such arrangement, the third horizontal sections of the top surfaces of some of the third grate bars carry high-temperature clinker, and the third lower curved surface changes the direction of the cooling air to an inclined direction of about 30 degrees. When the cooling air leaves the surface of the grate plate group, due to the Coanda effect, the cooling air turns from the third lower curved surface and adheres to the surface of the third horizontal section of the adjacent third grate bar, thereby forming an air cushion, reducing the wear of the grate plate group, and also extending the heat exchange path of the cooling air, thereby enhancing the heat exchange effect.

[0016] Optionally: the thickness of the third horizontal segment is greater than four millimeters.

[0017] With such arrangement, the thickness of the third horizontal section does not affect the gas flow field distribution, but can increase the service life of the grate plate of the grate plate assembly. Only when the thickness range of the third horizontal section is completely worn out, will it begin to affect the cooling air duct.

[0018] Optionally: the second horizontal section of the adjacent third grate bar corresponds to the third lower arc surface of the adjacent third grate bar.

[0019] With such arrangement, when there is a lot of powder material that is prone to leakage, the wind speed is low at a large opening rate, and the ability to resist leakage is weak, the second horizontal section can prevent the clinker from leaking under the grate through the cooling air duct.

[0020] Optionally: the air inlet of the cooling air duct is a V-shaped groove, and a bell mouth is formed between the second upper arc surface of the adjacent third grate bars and the third lower arc surface of the adjacent third grate bars, and the bell mouth and the V-shaped groove are interconnected.

[0021] With such arrangement, the cooling air duct has an appearance similar to an inclined trumpet mouth, and the cooling air is collected at the lower end of the V-shaped groove. The cooling air passes through the inclined trumpet mouth and gushes out at the narrowest air outlet at the upper end, thereby achieving rapid cooling of the clinker.

[0022] Optionally: a grate box is provided at the bottom of the grate plate group, the grate plate group is fixedly connected in the grate plate box, an annular bottom plate is provided at the bottom of the grate plate box, and the grate plate box is fixedly connected to the annular bottom plate.

[0023] With such arrangement, the grate box can limit and fix the grate group, and the annular bottom plate can allow lower cooling air to pass through the annular bottom plate into the cooling air duct of the grate group, thereby realizing rapid cooling and heat exchange of the clinker.

[0024] Optionally: the feed end of the grate box has a rear plate, the discharge end of the grate box has a front plate, and the height of the rear plate is greater than the height of the front plate.

[0025] With such arrangement, the height of the front plate is relatively low so that the cooling wind close to the front plate can be sprayed to cool the high-temperature clinker more smoothly, and the height of the rear plate is relatively high so as to block the material at the feed end so that a small amount of material is accumulated on the outer side of the rear plate, retaining a certain reasonable dead material layer, thereby reducing the wear of the grate plate group and effectively increasing the service life of the grate plate group.

[0026] Optionally, an intermediate plate is provided between the rear plate and the front plate, and two ends of the intermediate plate are respectively vertically fixedly connected to the rear plate and the front plate.

[0027] With such arrangement, the intermediate plate can effectively reduce the stress and load of a plurality of third grate bars, thereby improving the stability of the grate plate group.

[0028] Optionally: a first side plate and a second side plate are respectively provided on both sides of the above-mentioned middle plate, two ends of the above-mentioned first side plate are respectively vertically fixedly connected to one end of the above-mentioned rear plate and the above-mentioned front plate, two ends of the above-mentioned second side plate are respectively vertically fixedly connected to the other end of the above-mentioned rear plate and the above-mentioned front plate, and the height of the above-mentioned first side plate and the above-mentioned second side plate is greater than the height of the above-mentioned grate plate group.

[0029] Such arrangement can reduce the wear of the grate plate group and also facilitate the welding team.

[0030] Optionally, a bending plate is fixedly connected at the connection between the first side plate, the second side plate, the rear plate and the front plate.

[0031] In this way, the bent plate is configured to reduce welding deformation and welding amount, which is beneficial to improving the structural stability and strength of the grate box.

[0032] Optionally, a plurality of through holes are provided on the annular bottom plate outside the grate box.

[0033] In this way, the provision of the plurality of through holes facilitates the installation and disassembly of the grate plate assembly.

[0034] Based on the above description, the low-resistance and high-efficiency L-shaped grate plate disclosed in the present invention has the beneficial effects of streamlined and smooth low resistance, good rapid cooling heat exchange effect, high heat recovery efficiency, good process index parameters, low energy consumption, low discharge temperature, high discharge strength, high discharge abrasion resistance, long service life, low maintenance cost, good wind distribution ability and optimal cooling effect. BRIEF DESCRIPTION OF THE DRAWINGS

[0035] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings required for use in the embodiments are briefly introduced below. It should be understood that the following drawings only show certain embodiments of the present invention and therefore should not be regarded as limiting the scope. For ordinary technicians in this field, other related drawings can be obtained based on these drawings without creative work.

[0036] Figure 1 A three-dimensional stereogram of a low-resistance and high-efficiency L-shaped grate plate in an embodiment of the present invention;

[0037] Figure 2 is a cross-sectional view of a grate plate assembly in an embodiment of the present invention;

[0038] Figure 3 A three-dimensional stereogram of a grate box in an embodiment of the present invention;

[0039] Figure 4 is a three-dimensional stereogram of the third grate bar in an embodiment of the present invention;

[0040] Figure 5 is a front view of the third grate bar in the embodiment of the present invention;

[0041] Figure 6 is a three-dimensional stereogram of the second grate bar in an embodiment of the present invention;

[0042] Figure 7 It is a three-dimensional stereogram of the first grate bar in an embodiment of the present invention.

[0043] Icons: 1-grate plate group, 2-first grate bar, 3-second grate bar, 4-wavy arc surface, 5-first horizontal section, 6-first upper arc surface, 7-third grate bar, 8-cooling air duct, 9-second horizontal section, 10-third horizontal section, 11-second upper arc surface, 12-third lower arc surface, 13-V-shaped groove, 14-bell mouth, 15-grate plate box, 16-annular bottom plate, 17-rear plate, 18-front plate, 19-middle plate, 20-first side plate, 21-second side plate, 22-bent plate, 23-through hole. DETAILED DESCRIPTION

[0044] In order to make the purpose, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, not all of the embodiments. Generally, the components of the embodiments of the present invention described and shown in the drawings here can be arranged and designed in various different configurations.

[0045] Therefore, the following detailed description of the embodiments of the present invention provided in the accompanying drawings is not intended to limit the scope of the invention claimed for protection, but merely represents selected embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0046] Example

[0047] See also Figure 1 , Figure 2 , Figure 3 , Figure 4 , Figure 5 , Figure 6 and Figure 7 , this embodiment provides a low-resistance and high-efficiency L-shaped grate plate, including a plurality of grate plate groups 1;

[0048] Each of the grate plate groups 1 comprises a first grate bar 2 and a second grate bar 3, wherein the first grate bar 2 and the second grate bar 3 are parallel to each other and spaced apart;

[0049] The first grate bar 2 and the second grate bar 3 are both L-shaped structures, a wavy arc surface 4 is provided between the long side of the first grate bar 2 and the short side of the first grate bar 2, a first horizontal section 5 and a first upper arc surface 6 are provided between the long side of the second grate bar 3 and the short side of the second grate bar 3, and the first horizontal section 5 is connected to the first upper arc surface 6;

[0050] A plurality of third grate bars 7 are disposed between the first grate bars 2 and the second grate bars 3 . The plurality of third grate bars 7 are staggered, overlapped and evenly distributed. A cooling air duct 8 is disposed between adjacent third grate bars 7 .

[0051] When in use, the cooling air generated by the cooling air chamber passes through the gaps between the first grate bar 2, the second grate bar 3 and the plurality of third grate bars 7 in the grate plate group 1 and enters the high-temperature clinker for heat exchange cooling. The wavy curved surface 4, the first horizontal section 5, the first upper curved surface 6 and the cooling air duct 8 can all smoothly guide the air, so that the cooling air forms an air cushion on the top surface of the grate plate group 1.

[0052] The low-resistance and high-efficiency L-shaped grate plate disclosed in the present embodiment has a reasonable design of the grate plate group 1, so that the cooling air passes through the cooling air duct 8 and forms an air cushion on the grate plate group 1, so as to facilitate the rapid cooling and heat exchange of the clinker, thereby making the low-resistance and high-efficiency L-shaped grate plate have the beneficial effects of streamlined and smooth low resistance, good rapid cooling and heat exchange effect, high heat recovery efficiency, good process index parameters, low energy consumption, low discharge temperature, high discharge strength, high discharge wear resistance, long service life, low maintenance cost, good wind distribution ability and optimal cooling effect.

[0053] See also Figure 1 , Figure 2 , Figure 3 , Figure 4 , Figure 5 , Figure 6 and Figure 7 , the upper part of some third grate bars 7 has a second horizontal section 9 and a third horizontal section 10, and a second upper curved surface 11 is provided between the second horizontal section 9 and the third horizontal section 10; the lower part of some third grate bars 7 has a third lower curved surface 12, and the third lower curved surface 12 is located at the lower part of the third horizontal section 10. The third horizontal section 10 on the top surface of some third grate bars 7 carries high-temperature clinker. The third lower curved surface 12 changes the direction of the cooling air to an inclined direction of about 30 degrees. When the cooling air leaves the surface of the grate plate group 1, due to the Coanda effect, the cooling air turns from the third lower curved surface 12 and fits on the surface of the third horizontal section 10 of the adjacent third grate bar 7, which can form an air cushion, reduce the wear of the grate plate group 1, and also extend the heat exchange path of the cooling air to enhance the heat exchange effect.

[0054] The thickness of the third horizontal section 10 is greater than four millimeters. The thickness of the third horizontal section 10 does not affect the gas flow field distribution, but can increase the service life of the grate plate of the grate plate group 1. Only when the thickness range of the third horizontal section 10 is completely worn out, will it begin to affect the cooling air duct 8.

[0055] The second horizontal section 9 of the adjacent third grate bar 7 corresponds to the third lower arc surface 12 of the adjacent third grate bar 7. When there is a lot of powder and it is easy to leak, the wind speed is low at a large opening rate, and the anti-leakage ability is weak, the second horizontal section 9 can prevent the clinker from leaking into the grate through the cooling air duct 8.

[0056] See also Figure 1 , Figure 2 , Figure 3 , Figure 4 , Figure 5 , Figure 6 and Figure 7 The air inlet of the cooling air duct 8 is a V-shaped groove 13, and a bell mouth 14 is formed between the second upper arc surface 11 of the adjacent third grate bar 7 and the third lower arc surface 12 of the adjacent third grate bar 7. The bell mouth 14 and the V-shaped groove 13 are interconnected. The shape of the cooling air duct 8 is similar to the inclined bell mouth 14. The lower end of the V-shaped groove 13 collects cooling air, and the cooling air passes through the inclined bell mouth 14 and gushes out at the narrowest air outlet at the upper end, thereby realizing rapid cooling of the clinker.

[0057] A grate box 15 is provided at the bottom of the grate group 1, and the grate group 1 is fixedly connected in the grate box 15. An annular bottom plate 16 is provided at the bottom of the grate box 15, and the grate box 15 is fixedly connected to the annular bottom plate 16. The grate box 15 can limit and fix the grate group 1, and the annular bottom plate 16 can allow the lower cooling air to pass through the annular bottom plate 16 into the cooling air duct 8 of the grate group 1, thereby realizing the rapid cooling and heat exchange of the clinker.

[0058] The feeding end of the grate box 15 has a rear plate 17, and the discharging end of the grate box 15 has a front plate 18. The height of the rear plate 17 is greater than that of the front plate 18. The height of the front plate 18 is lower so that the cooling wind close to the front plate 18 can spray and cool the high-temperature clinker more smoothly. The height of the rear plate 17 is higher so as to block the material at the feeding end, so that a small amount of material is accumulated on the outside of the rear plate 17, retaining a certain reasonable dead material layer, which can reduce the wear of the grate group 1 and effectively improve the service life of the grate group 1.

[0059] An intermediate plate 19 is provided between the rear plate 17 and the front plate 18 , and both ends of the intermediate plate 19 are vertically fixedly connected to the rear plate 17 and the front plate 18 , respectively. The intermediate plate 19 can effectively reduce the stress and load of a plurality of third grate bars 7 , and improve the stability of the grate plate group 1 .

[0060] A first side plate 20 and a second side plate 21 are respectively provided on both sides of the middle plate 19, and both ends of the first side plate 20 are respectively vertically fixedly connected to one end of the rear plate 17 and the front plate 18, and both ends of the second side plate 21 are respectively vertically fixedly connected to the other end of the rear plate 17 and the front plate 18. The height of the first side plate 20 and the second side plate 21 is greater than the height of the grate plate group 1, which can reduce the wear of the grate plate group 1 and also facilitate welding.

[0061] A bent plate 22 is fixedly connected to the connection between the first side plate 20 and the second side plate 21 and the rear plate 17 and the front plate 18 . The bent plate 22 is used to reduce welding deformation and welding amount, which is beneficial to improving the structural stability and strength of the grate box 15 .

[0062] A plurality of through holes 23 are formed on the annular bottom plate 16 outside the grate plate box 15 . The provision of the plurality of through holes 23 facilitates the installation and removal of the grate plate assembly 1 .

[0063] In this embodiment, the clinker enters the upper part of the grate plate group 1 from the rear plate 17 and exhausts from the front plate 18. During this process, the cooling air at the lower part of the grate plate group 1 is blown toward the clinker at the upper part of the grate plate group 1 through the cooling air duct 8 to facilitate rapid cooling and heat exchange of the clinker.

[0064] See also Figure 1 , Figure 2 , Figure 3 , Figure 4 , Figure 5 , Figure 6 and Figure 7 In this embodiment, the first grate bar 2, the second grate bar 3 and the third grate bar 7 adopt a streamlined design, the entire grate bar is round and smooth, and the cooling air duct 8 formed between adjacent third grate bars 7 is also relatively smooth without excessive bends. Therefore, the resistance of the cooling air duct 8 is small, which can reduce the pressure and power consumption of the fan equipped with the grate cooler.

[0065] See also Figure 1 , Figure 2 , Figure 3 , Figure 4 , Figure 5 , Figure 6 and Figure 7 In this embodiment, the cooling air duct 8 is in an oblique trumpet shape, gradually narrowing from wide. After the cooling air is gathered, it gushes out at the trumpet mouth 14 and blows quickly toward the high-temperature clinker, forming an expansive flow, generating rapid momentum and heat exchange in the adjacent interface layer, which is beneficial to improving the heat exchange efficiency and accelerating the rapid cooling and heat exchange of the clinker.

[0066] See also Figure 1 , Figure 2 , Figure 3 , Figure 4 , Figure 5 , Figure 6 and Figure 7 In this embodiment, the cooling air duct 8 is horizontally discharged on the surface of the grate group 1, which has the effect of forming an air cushion and reducing the wear of the grate group 1. The rear plate 17 in the grate box 15 is relatively high, which can make a certain reasonable dead material layer gather on the grate group 1, and can also play a role in reducing the wear of the grate group 1. In addition, the thickness of the third horizontal section 10 is relatively high, that is, theoretically, the cooling air duct 8 will not be affected until the thickness area of ​​the third horizontal section 10 is worn. Therefore, increasing the thickness of the third horizontal section 10 can also greatly extend the overall service life of the grate group 1.

[0067] See also Figure 1 , Figure 2 , Figure 3 , Figure 4 , Figure 5 , Figure 6 and Figure 7In this embodiment, the number and size of the cooling air ducts 8 are reasonably distributed, and the air distribution capacity is good, which eliminates the phenomenon of uneven cooling and material segregation of the clinker caused by uneven air supply.

[0068] In this embodiment, a plurality of grate plate groups 1 are connected end to end to form a grate bed, so as to extend the heat exchange cooling time and path.

[0069] In this embodiment, the gap size of the cooling air duct 8 between adjacent third grate bars 7 can be adjusted according to process requirements, which has strong versatility and process adaptability. However, the direction of the airflow is the same as the conveying direction of the clinker, which is also beneficial to the forward conveying of the clinker to a certain extent.

[0070] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. For those skilled in the art, the present invention may have various modifications and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. A low-resistance and high-efficiency L-shaped grate plate, characterized in that: It comprises a plurality of grate plate groups (1); A plurality of the grate plate groups (1) each comprises a first grate bar (2) and a second grate bar (3), wherein the first grate bar (2) and the second grate bar (3) are parallel to and spaced from each other; The first grate bar (2) and the second grate bar (3) are both L-shaped structures, a wavy arc surface (4) is provided between the long side of the first grate bar (2) and the short side of the first grate bar (2), a first horizontal section (5) and a first upper arc surface (6) are provided between the long side of the second grate bar (3) and the short side of the second grate bar (3), and the first horizontal section (5) is connected to the first upper arc surface (6); A plurality of third grate bars (7) are arranged between the first grate bars (2) and the second grate bars (3); the plurality of third grate bars (7) are staggered, overlapped and evenly distributed; and a cooling air duct (8) is provided between adjacent third grate bars (7).

2. A low-resistance and high-efficiency L-shaped grate plate according to claim 1, characterized in that: The upper parts of the plurality of third grate bars (7) have a second horizontal section (9) and a third horizontal section (10), and a second upper curved surface (11) is provided between the second horizontal section (9) and the third horizontal section (10); The lower parts of the plurality of third grate bars (7) have a third lower arc surface (12), and the third lower arc surface (12) is located at the lower part of the third horizontal section (10).

3. A low-resistance and high-efficiency L-shaped grate plate according to claim 2, characterized in that: The thickness of the third horizontal section (10) is greater than four millimeters.

4. The low-resistance and high-efficiency L-shaped grate plate according to claim 2, characterized in that: The second horizontal section (9) adjacent to the third grate bar (7) corresponds to the third lower arc surface (12) adjacent to the third grate bar (7).

5. The low-resistance and high-efficiency L-shaped grate plate according to claim 2, characterized in that: The air inlet of the cooling air duct (8) is a V-shaped groove (13), and a bell mouth (14) is formed between the second upper arc surface (11) of the adjacent third grate bar (7) and the third lower arc surface (12) of the adjacent third grate bar (7), and the bell mouth (14) and the V-shaped groove (13) are interconnected.

6. The low-resistance and high-efficiency L-shaped grate plate according to claim 1, characterized in that: A grate box (15) is provided at the bottom of the grate plate group (1), the grate plate group (1) is fixedly connected inside the grate plate box (15), an annular bottom plate (16) is provided at the bottom of the grate plate box (15), and the grate plate box (15) is fixedly connected to the annular bottom plate (16).

7. The low-resistance and high-efficiency L-shaped grate plate according to claim 6, characterized in that: The feed end of the grate box (15) is provided with a rear plate (17), the discharge end of the grate box (15) is provided with a front plate (18), and the height of the rear plate (17) is greater than the height of the front plate (18).

8. The low-resistance and high-efficiency L-shaped grate plate according to claim 7, characterized in that: An intermediate plate (19) is provided between the rear plate (17) and the front plate (18), and two ends of the intermediate plate (19) are respectively vertically fixedly connected to the rear plate (17) and the front plate (18).

9. The low-resistance and high-efficiency L-shaped grate plate according to claim 8, characterized in that: A first side plate (20) and a second side plate (21) are respectively provided on both sides of the middle plate (19); two ends of the first side plate (20) are respectively vertically fixedly connected to one end of the rear plate (17) and the front plate (18); two ends of the second side plate (21) are respectively vertically fixedly connected to the other end of the rear plate (17) and the front plate (18); and the height of the first side plate (20) and the second side plate (21) is greater than the height of the grate plate group (1).

10. The low-resistance and high-efficiency L-shaped grate plate according to claim 9, characterized in that: A bending plate (22) is fixedly connected at the connection points between the first side plate (20) and the second side plate (21) and the rear plate (17) and the front plate (18).

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