Fire grate supporting beam sealing system

Abstract

The invention relates to the technical field of garbage incinerators, and discloses a fire grate supporting beam sealing system which comprises an outer sealing assembly and an inner sealing assembly, the outer sealing assembly and the inner sealing assembly are both arranged in a fire grate frame and both applied to the linear stroke position of a supporting beam, and the outer sealing assembly and the inner sealing assembly jointly form a sealing cavity; the outer sealing assembly comprises a sealing frame and two sealing cover plates, and the sealing frame and the sealing cover plates are fixed. The inner sealing assembly comprises two inner sealing frames. According to the scheme, the sealing system is arranged in and acts on the linear motion area of the fire grate supporting beam, the sealing gap problem caused by swing of a traditional driving arm is solved, an inner and outer double-layer sealing structure is adopted, a multi-layer sealing measure is combined, the primary air blocking capacity is effectively improved in the high-temperature environment, meanwhile, air is introduced into a sealing cavity, and the sealing effect is improved. And a stable air sealing barrier is formed, a sealing area is cooled, and the service life of a sealing piece is prolonged.

Description

Technical Field

[0001] This invention relates to the field of waste incinerator technology, and in particular to a grate support beam sealing system. Background Technology

[0002] The grate of an incinerator is a key component for carrying and transporting waste during the waste incineration process. It is usually located at the bottom of the furnace. Its main functions are to support the material during waste combustion, achieve uniform material distribution, promote complete combustion, and push the burnt residue towards the ash outlet. The grate is generally made of high-temperature resistant and corrosion-resistant alloy materials. It can also control the residence time of waste in the furnace to ensure complete combustion. This device directly affects the thermal efficiency, emission level, and operational stability of the incinerator and is one of the core components of a modern waste incineration system.

[0003] In existing reciprocating grate technology, the sealing between the grate drive mechanism and the furnace body is generally poor, mainly due to its motion characteristics. The connecting rod in the drive mechanism swings during movement, making it difficult to achieve a tight seal at the connection with the grate frame. To avoid motion interference, the sealing structure usually has a reserved gap or uses flexible materials. However, under the action of high-temperature primary air and long-term alternating stress, the seals are prone to aging, deformation, or even damage, resulting in seal failure. The direct consequence of this is that high-temperature primary air inside the furnace and ash leakage from the grate leak out through the gaps, which not only pollutes the environment and endangers the health of operators, but also makes it difficult to lubricate the hydraulic cylinder bearings in the high-temperature environment. Furthermore, the high temperature environment accelerates the aging of the hydraulic cylinder seals, leading to their failure and shortening the maintenance time and service life of the hydraulic cylinder. Therefore, the weak sealing between the grate drive connecting rod and the furnace body area has become one of the key issues restricting the safe, stable, and clean operation of incinerators. Summary of the Invention

[0004] The purpose of this invention is to address the shortcomings of existing technologies by proposing a grate support beam sealing system.

[0005] To achieve the above objectives, the present invention adopts the following technical solution:

[0006] A grate support beam sealing system includes an outer sealing assembly and an inner sealing assembly. Both the outer and inner sealing assemblies are disposed inside the grate frame and applied to the linear stroke position of the support beam. The inner sealing assembly is disposed inside the outer sealing assembly, and the outer and inner sealing assemblies together form a sealing cavity. The outer sealing assembly includes a sealing frame and two sealing cover plates, with the sealing frame fixed to the sealing cover plates. The inner sealing assembly includes two inner sealing frames, which are respectively positioned opposite the two sealing cover plates. Each sealing cover plate includes a sealing plate with an air inlet communicating with the sealing cavity for connecting an external fan to regulate the air pressure within the sealing cavity.

[0007] As a preferred embodiment of the present invention, the sealing frame further includes two vertical frames and two horizontal frames, the two vertical frames and the two horizontal frames together forming a U-shaped structure, and the sealing plate is fixed to the middle section of the inner side of the two horizontal frames respectively; the sealing cover plate includes two vertical cover plates and two horizontal cover plates, the vertical cover plates and the horizontal cover plates together forming a U-shaped structure, and are slidably sleeved on the grate support beam, the two sealing cover plates are respectively disposed on both sides of the sealing plate, the two horizontal cover plates are respectively fixed to the two horizontal frames, one vertical cover plate is fixed to the vertical frame, and the other vertical cover plate is fixed to the sealing plate.

[0008] As a preferred embodiment of the present invention, the upper surface of the sealing plate and the upper surface of the horizontal frame are on the same horizontal plane.

[0009] As a preferred embodiment of the present invention, the two vertical frames and the two horizontal frames are all fixedly connected to the bottom plate in the grate frame by welding, and the sealing plate is fixed to the horizontal frame by welding.

[0010] As a preferred embodiment of the present invention, the inner sealing frame includes two sealing frame one and two sealing frame two. The sealing frame one and sealing frame two together form a U-shaped structure and are slidably sleeved on the support beam of the grate. Several U-shaped slots are provided between the inner sides of the two sealing frame one and the two sealing frame two. The inside of the slots is provided with a high-temperature resistant and low-friction sealing element. The sealing element is slidably connected to the side wall of the grate support beam. A sealing ring is provided between the side wall of the sealing element and the inner side of the slot.

[0011] As a preferred embodiment of the present invention, the sealing frame one and the sealing frame two are fixed to the base plate of the grate frame by bolts.

[0012] As a preferred embodiment of the present invention, the sealing element is made of PTFE material, and the sealing ring is made of silicone rubber material.

[0013] As a preferred embodiment of the present invention, the side walls of the two sealing frames one and the two sealing frames two are jointly embedded with a U-shaped aluminum silicate fiber rope.

[0014] As a preferred embodiment of the present invention, the side walls of the two sealing frames one and the two sealing frames two are provided with a sealing gasket layer for improving the sealing performance between the inner sealing frame and the grate bottom plate.

[0015] As a preferred embodiment of the present invention, a gasket is provided between the sealing cover and the sealing frame, and the gasket has a U-shaped structure.

[0016] The present invention has the following beneficial effects:

[0017] This solution specifically optimizes the existing reciprocating grate system in terms of structural layout and sealing strategy. By integrating the outer and inner sealing components into the grate frame and placing them in the linear movement area of ​​the support beam, it avoids the sealing difficulties caused by the complex swing trajectory of the traditional drive arm, reducing leakage paths caused by dynamic gaps. The inner and outer two-layer U-shaped sealing structure, combined with low-friction seals, O-rings, aluminum silicate fiber ropes, and a bottom sealing pad, constitutes a multi-level synergistic sealing system with good barrier capability against high-temperature primary air. The sealing components adopt a combination of welding and bolting installation, ensuring overall rigidity while providing convenience for maintenance and replacement. In addition, by setting an air inlet on the sealing plate and connecting it to a continuously running micro-positive pressure fan, clean air is stably supplied to the sealing cavity, making the pressure inside the cavity slightly higher than the pressure in the grate air chamber, forming a stable airflow barrier from the outside to the inside. This helps to suppress the escape of primary air and has a certain cooling effect on the sealing area, which is conducive to extending the service life of the sealing material. The overall solution improves the sealing reliability and also improves the operational stability and environmental performance of the incineration system. Attached Figure Description

[0018] Figure 1 This is a schematic diagram of the grate connecting rod and the sealing structure between the connecting rod and the furnace body in the prior art.

[0019] Figure 2 for Figure 1 Enlarged view of the sealing structure between the connecting rod and the furnace body;

[0020] Figure 3 This is a schematic diagram of the structure of a grate support beam sealing system proposed in this invention;

[0021] Figure 4 for Figure 3 Enlarged view of the structure at point A;

[0022] Figure 5 for Figure 3 Cross-sectional view at BB;

[0023] Figure 6 This is a schematic diagram of the sealing cover plate in the external sealing assembly;

[0024] Figure 7 This is a cross-sectional view of the inner sealing assembly;

[0025] Figure 8 for Figure 3 Cross-sectional view at CC;

[0026] Figure 9 This is a schematic diagram of the inner sealing frame.

[0027] In the diagram: 11 Vertical frame, 12 Horizontal frame, 13 Sealing plate, 131 Air inlet, 14 Opening, 21 Vertical cover plate, 22 Horizontal cover plate, 23 Through-hole one, 3 Gasket, 41 Sealing frame one, 42 Sealing frame two, 43 Through-hole two, 44 ​​Groove, 51 Sealing element, 52 Sealing ring, 53 Aluminum silicate fiber rope, 54 Sealing pad layer. Detailed Implementation

[0028] The technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present invention. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments.

[0029] Before introducing the technical solutions described in this manual, a brief introduction to the structure and working principle of existing solid waste incineration devices will be given:

[0030] Please see the appendix Figure 1 The reciprocating grate system in the prior art generally includes a linkage mechanism: connecting the crank and the grate support beam, converting rotational motion into reciprocating linear motion; a crank mechanism: a hydraulically driven hydraulic cylinder, serving as the power input end to achieve circular motion; a grate frame, including several grate plates and several support beams b for supporting the grate plates: the grate plates carry the waste, and the support beams b move linearly under the action of the linkage mechanism to push the material and control combustion; supports and hinge points: multiple rotating joints that allow the components to swing relative to each other during movement, ensuring smooth movement; and slide rails and guide devices: limiting the horizontal movement trajectory of the grate frame to prevent deviation.

[0031] Its working principle is as follows: When the crank rotates, it drives the connecting rod structure to swing back and forth. One end of the connecting rod structure is fixed to the crank, and the other end is hinged to the support beam b. When the crank rotates, the connecting rod drives the grate support beam b to move back and forth along the slide rail, so that the grate plates continuously push the garbage, promote air circulation and complete combustion. The whole system achieves synchronous movement through multiple sets of linkage mechanisms.

[0032] Please refer to the appendix for details. Figure 2 The linkage structure includes a drive arm a. In the prior art, in order to ensure the sealing of the furnace, a sealing mechanism is usually set between the drive arm a and the grate frame. When the drive arm a pushes the grate support beam b to make a linear reciprocating motion, its head movement trajectory is arc-shaped, which will cause lateral offset and angular displacement. The overall structure swings. There is a large gap between the drive arm a and the sealing mechanism to allow it to swing. Moreover, the swinging motion will squeeze the sealing mechanism. Such a structure affects the sealing of the incinerator and is prone to primary air leakage.

[0033] In summary, existing incinerator technologies suffer from poor sealing performance, frequent maintenance, and easy gas leakage at the connection between the grate drive mechanism and the grate frame.

[0034] Therefore, please participate in the attached Figure 3 The present invention proposes a grate support beam sealing system, including an outer sealing component and an inner sealing component. The outer sealing component and the inner sealing component are arranged in a built-in form inside the grate frame and applied to the linear stroke position of the support beam to avoid the change of sealing range caused by the swing of the connecting rod. The outer sealing component and the inner sealing component form a sealing cavity.

[0035] Specifically, please refer to the appendix. Figures 4-6 The outer sealing assembly includes a sealing frame, which includes two vertical frames 11 and two horizontal frames 12. The two vertical frames 11 and two horizontal frames 12 are all L-shaped and are fixedly connected to the bottom plate in the grate frame by welding. The whole assembly forms a U-shaped outer flange structure. A sealing plate 13 is fixed between the two horizontal frames 12. The sealing plate 13 is fixed to the middle section of the horizontal frame 12 by welding. The upper surface of the sealing plate 13 is on the same horizontal plane as the upper surface of the horizontal frame 12. An opening 14 is formed between the sealing plate 13 and the vertical frame 11 for the grate support beam to pass through.

[0036] The outer sealing assembly also includes two sealing covers, which are positioned directly above the opening 14. The sealing covers include two vertical covers 21 and two horizontal covers 22. The vertical covers 21 and the horizontal covers 22 together form a U-shaped structure, and the four together form a through opening 23. The through opening 23 allows the grate support beam to pass through, and its inner side is slidably connected to the side wall of the grate support beam. The two horizontal covers 22 are fixed to the two horizontal frames 12 respectively. One of the vertical covers 21 is fixed to the vertical frame 11, and the other vertical cover 21 is fixed to the sealing plate 13. The fixing method is by bolts and nuts. In addition, the bottom of the sealing cover is also provided with a U-shaped gasket 3 to improve the sealing performance and stability of the connection between the sealing cover and the sealing frame.

[0037] Please refer to Figures 7-9The inner sealing assembly includes two inner sealing frames, each corresponding to one of the two sealing covers. The inner sealing frames are located inside the outer sealing frame. Each inner sealing frame includes two sealing frames 41 and 42. Sealing frames 41 and 42 are fixed to the base plate of the grate frame using bolts and nuts. Sealing frames 41 and 42 together form a U-shaped structure, with a through-hole 43 formed between them. The inner side of through-hole 43 is slidably connected to the side wall of the grate support beam. Through-hole 43 and through-hole 23 are of the same size and directly opposite each other, serving to allow the support beam to pass through and accommodate its linear reciprocating motion. Several U-shaped sections are provided between the inner sides of the two sealing frames 41 and 42. The device features a slotted structure 44 with a low-friction seal 51 inside. The seal 51 is attached to and slidably connected to the side wall of the support beam. An O-ring 52 made of silicone rubber is provided between the side wall of the seal 51 and the inner side of the slot 44 to improve the sealing performance between the inner sealing assembly and the support beam. The side walls of the two sealing frames 41 and 42 are embedded with a U-shaped aluminum silicate fiber rope 53. A non-asbestos sealing gasket 54 is provided between the side walls of the two sealing frames 41 and 42 and the bottom plate of the grate. The sealing gasket 54 improves the sealing performance of the inner sealing assembly and the stability of the device. Under the action of the multi-layer sealing structure in the inner sealing assembly, the device can prevent the leakage of high-temperature primary air from the furnace body.

[0038] Furthermore, the sealing plate 13 is provided with an air inlet 131, which is connected to the air outlet of the blower and is preferentially connected to the normally open micro positive pressure blower system. The blower can introduce room temperature air into the sealing cavity between the outer sealing component and the inner sealing component, so that the cavity maintains a slightly higher micro positive pressure state than the inside of the furnace, thereby actively inhibiting the high temperature primary air in the furnace from seeping out through the inner sealing gap, realizing the active sealing mechanism of "sealing air with air". This design not only significantly reduces the risk of leakage, but also cools the sealing area, extends the life of the sealing device, and improves the environmental protection, safety and operational stability of the incineration device as a whole.

[0039] The specific working principle of this invention is as follows:

[0040] The outer and inner sealing components are integrated inside the grate frame, and a double-layer U-shaped sealing structure is constructed around the support beam that makes linear reciprocating motion. A multi-level static seal is formed by low-friction sealing element 51, O-ring, aluminum silicate fiber rope 53 and sealing gasket 54. At the same time, an air inlet 131 is set on the sealing plate 13 of the outer sealing component and connected to a continuously running micro positive pressure fan to continuously introduce room temperature air into the sealing cavity between the inner and outer sealing components, so that the cavity maintains a positive pressure environment slightly higher than that of the furnace, thereby actively preventing high-temperature primary air from leaking from the inside to the outside, realizing dual protection of structural sealing and gas sealing, and effectively solving the problem of sealing failure caused by the swing of the drive arm in traditional methods.

[0041] The above description is only a preferred embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any equivalent substitutions or modifications made by those skilled in the art within the scope of the technology disclosed in the present invention, based on the technical solution and inventive concept of the present invention, should be covered within the scope of protection of the present invention.

Claims

1. A grate support beam sealing system, characterized in that, It includes an outer sealing assembly and an inner sealing assembly, both of which are located inside the grate frame and are applied to the linear stroke position of the support beam. The inner sealing assembly is located inside the outer sealing assembly, and the outer and inner sealing assemblies together form a sealing cavity. The external sealing assembly includes a sealing frame and two sealing covers, wherein the sealing frame is fixed to the sealing covers; The inner sealing assembly includes two inner sealing frames, which are respectively positioned opposite to two sealing cover plates; The sealing cover includes a sealing plate (13), and the sealing plate (13) has an air inlet (131) that communicates with the sealing cavity, which is used to connect an external fan to regulate the air pressure in the sealing cavity.

2. The grate support beam sealing system according to claim 1, characterized in that, The sealing frame also includes two vertical frames (11) and two horizontal frames (12). The two vertical frames (11) and the two horizontal frames (12) together form a U-shaped structure. The sealing plate (13) is fixed to the middle section inside the two horizontal frames (12). The sealing cover plate includes two vertical cover plates (21) and two horizontal cover plates (22). The vertical cover plates (21) and the horizontal cover plates (22) together form a U-shaped structure and are slidably mounted on the grate support beam. The two sealing cover plates are respectively set on both sides of the sealing plate (13). The two horizontal cover plates (22) are respectively fixed to the two horizontal frames (12). One of the vertical cover plates (21) is fixed to the vertical frame (11), and the other vertical cover plate (21) is fixed to the sealing plate (13).

3. The grate support beam sealing system according to claim 2, characterized in that, The upper surface of the sealing plate (13) is on the same horizontal plane as the upper surface of the cross frame (12).

4. The grate support beam sealing system according to claim 2, characterized in that, The two vertical frames (11) and the two horizontal frames (12) are fixedly connected to the bottom plate in the grate frame by welding, and the sealing plate (13) is fixed to the horizontal frame (12) by welding.

5. A grate support beam sealing system according to claim 2, characterized in that, The inner sealing frame includes two sealing frame one (41) and two sealing frame two (42). The sealing frame one (41) and the sealing frame two (42) together form a U-shaped structure and are slidably fitted on the support beam of the grate. Several U-shaped slots (44) are provided between the inner sides of the two sealing frame one (41) and the two sealing frame two (42). The slots (44) are provided with low friction sealing elements (51). The sealing elements (51) are slidably connected to the side wall of the grate support beam. A sealing ring (52) is provided between the side wall of the sealing elements (51) and the inner side of the slots (44).

6. A grate support beam sealing system according to claim 5, characterized in that, The sealing frame one (41) and sealing frame two (42) are fixed to the bottom plate of the grate frame by bolts.

7. A grate support beam sealing system according to claim 5, characterized in that, The seal (51) is made of PTFE material, and the sealing ring (52) is made of silicone rubber material.

8. A grate support beam sealing system according to claim 5, characterized in that, The sidewalls of the two sealing frames one (41) and the two sealing frames two (42) are jointly embedded with a U-shaped aluminum silicate fiber rope (53).

9. A grate support beam sealing system according to claim 5, characterized in that, The side walls of the two sealing frames one (41) and the two sealing frames two (42) are provided with a sealing gasket layer (54) to improve the sealing between the inner sealing frame and the grate bottom plate.

10. A grate support beam sealing system according to claim 2, characterized in that, A gasket (3) is provided between the sealing cover and the sealing frame, and the gasket (3) has a U-shaped structure.

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