Ash removal knife for a large-scale pressurized coal gasification furnace

Abstract

A large-scale coal-fired pressurized gasification furnace ash removal knife, relating to the technical field of coal gasification equipment, includes a knife head, a knife handle, a knife body, and a knife holder. An arc-shaped rib perpendicular to the knife handle is provided on one side. One end of the arc-shaped rib is connected to the knife holder, and the other end extends to the connection between the knife head and the knife body. The thickness of the knife head gradually increases from its top to the connection with the knife body, forming a wedge-shaped structure. This invention effectively supports the ash removal knife against the pressure of the ash layer above by setting an arc-shaped rib on the knife handle, preventing the knife head and knife body from deforming due to downward pressure. Simultaneously, the wedge-shaped knife head, together with the arc-shaped rib, resists the pressure generated when the knife head breaks slag, avoiding lateral deformation of the knife head, improving the ash removal knife's lifespan, and reducing the frequency of furnace shutdown maintenance.

Description

Technical Field

[0001] This utility model relates to the technical field of coal gasification equipment, specifically to an ash removal knife for a large-scale crushed coal pressurized gasification furnace. Background Technology

[0002] A pressurized coal gasifier, also known as a fixed-bed or moving-bed gasifier, is a device that uses coal and a gasifying agent to react chemically, converting coal into fuel gas or syngas. The pressurized coal gasifier uses lump coal with a particle size of 6-50mm, added from the top of the gasifier. The gasifying agent is a mixture of steam and oxygen, introduced from the bottom of the grate. The coal and gasifying agent react counter-currently, undergoing oxidation and reduction reactions to produce crude coal gas, while the residue is discharged in solid form. The gasifier is equipped with a tower-shaped rotating grate, which supports the movement of the bed, distributes the gasifying agent, and discharges ash. Ash removal blades are installed at the bottom of the grate; as the grate rotates, they interact with the guard plates to crush the ash, which is then fed into an inner crushing ring for further crushing before being discharged into an ash lock for final ash removal.

[0003] Currently, the main type of pulverized coal pressurized gasification furnace in operation in China is the Saiding 3800-40 model, with a diameter of 3.8m, and it uses traditional ash removal blades. Figure 1 As shown, the device includes a cutter head 1, a cutter handle 2, a cutter body 3, and a cutter holder 4. The cutter head 1, cutter body 3, and cutter holder 4 are located below the cutter handle 2 and perpendicular to the cutter handle 2. One end of the cutter handle 2 is located on the cutter holder 4, and the other end is equipped with the cutter head 1. The two ends of the cutter body 3 are connected to the cutter head 1 and the cutter holder 4, respectively. During the operation of the gasifier, the ash discharge knife is always in contact with high-temperature ash and slag. Due to different coal qualities, high-temperature ash and slag may adhere to the surface of the ash discharge knife. Continuous high temperature causes the structure to deteriorate and cracks to appear. At the same time, the pressure of the ash layer above and the coal pushing in front causes the ash discharge knife head to bend and sink, scraping the guard plate, and creating a blind zone for scraping. In some cases, the ash discharge knife may even break directly.

[0004] Saiding's next-generation Φ5m pulverized coal pressurized gasifier (5000-60 furnace type) is about to be put into operation. The gasifier diameter has been increased from 3.8m to 5m, which greatly improves the gasification capacity. However, at the same time, the ash layer is thicker and the amount of ash discharged is increased. This increases the pressure on the ash discharge knife from scraping and conveying ash and the ash layer above. If the traditional ash discharge knife structure is continued, the bending of the knife head and the breakage of the knife body will be more serious, affecting the stable operation of the gasifier. Utility Model Content

[0005] Based on the problems existing in the prior art, the purpose of this utility model is to propose an ash removal knife for a large-scale coal crushing pressurized gasification furnace.

[0006] The technical solution adopted by this utility model is: a large ash removal knife for a pressurized coal gasification furnace, including a knife head, a knife handle, a knife body, and a knife holder. An arc-shaped rib perpendicular to the knife handle is provided on one side. One end of the arc-shaped rib is connected to the knife holder, and the other end extends to the connection between the knife head and the knife body. The thickness of the knife head gradually increases from the top to the connection with the knife body, forming a wedge-shaped structure.

[0007] As a preferred embodiment, the side of the arc-shaped rib away from the handle is flush with the side of the blade away from the handle.

[0008] As a preferred embodiment, the thickness of the arc-shaped rib is 20-40 mm.

[0009] As a preferred embodiment, the outer edge of the side arc of the cutter head smoothly transitions to one side of the arc-shaped rib.

[0010] As a preferred embodiment, the cutting head extends from one side of the handle to the other side.

[0011] As a preferred embodiment, the height of one side of the cutter head is 180-190mm, and the height of the extended portion on the other side is 65-75mm.

[0012] As a preferred embodiment, the tool holder has an outer edge composed of multiple arc-shaped segments.

[0013] As a preferred embodiment, the middle of the outer edge is provided with a stepped contraction section, so that the front end of the handle has a smaller width than the rear end.

[0014] As a preferred embodiment, the tool holder is provided with a lifting hole and a mounting bolt hole.

[0015] The beneficial effects of this utility model are: This invention features an arc-shaped rib on the handle, which connects to the cutter head, body, and holder. This effectively supports the ash removal blade against the pressure of the ash layer above, preventing the cutter head and body from sagging due to stress. Simultaneously, a wedge-shaped cutter head is provided, which, together with the arc-shaped rib, resists the pressure generated when the cutter head breaks slag, preventing lateral deformation of the cutter head, increasing the lifespan of the ash removal blade, and reducing the frequency of shutdown maintenance. Attached Figure Description

[0016] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0017] Figure 1 This is a schematic diagram of a traditional ash removal knife structure; Figure 2Top view of a traditional ash removal blade installed on a grate; Figure 3 This is a schematic diagram of the structure of this utility model; Figure 4 This is a top view of the present invention installed on the grate.

[0018] Attached reference numerals: 1. Blade head, 2. Blade handle, 3. Blade body, 4. Blade holder, 5. Arc-shaped rib, 6. Outer edge, 7. Shrinkage section, 8. Grate. Detailed Implementation

[0019] The present invention will now be described in detail through exemplary embodiments. However, it should be understood that, without further description, elements, structures and features in one embodiment may be advantageously incorporated into other embodiments.

[0020] To more clearly describe an ash removal knife for a large-scale pulverized coal pressurized gasification furnace, a detailed description is provided below with reference to the accompanying drawings: like Figure 3 As shown, a large coal-fired pressurized gasifier ash removal knife includes a knife head 1, a knife handle 2, a knife body 3, a knife holder 4, and an arc-shaped rib 5. The knife handle 2 is placed horizontally in the gasifier. The knife holder 4 is provided perpendicularly to the knife handle 2, and one end of the knife handle 2 is set on the knife holder 4. The knife body 3 is provided on one side of the knife holder 4, and the knife head 1 is provided at the other end of the knife body 3. The knife head 1 and the knife body 3 are both perpendicular to the knife handle 2. The knife head 1 extends from the bottom of the knife handle 2 upward to the top of the knife handle 2. The height of the part of the knife head 1 extending to the top of the knife handle 2 is 65-75mm, and the height of the part below is 180-190mm. The thickness of the knife head 1 gradually increases from the top to the connection with the knife body 3, forming a wedge-shaped structure.

[0021] Furthermore, the tool holder 2 is provided with an outer edge 6 composed of multiple arc segments, and a stepped contraction section 7 is provided in the middle of the outer edge 6, so that the front end of the tool holder 2 has a smaller width than the rear end. The tool holder 2 is provided with a lifting hole and a mounting bolt hole (not shown in the figure).

[0022] In this embodiment, the arc-shaped rib 5 is disposed below the handle 2 and perpendicular to the handle 2. One end of the arc-shaped rib 5 is connected to the blade holder 4, and the other end extends to the connection between the blade head 1 and the blade body 3. The side of the arc-shaped rib 5 away from the handle 2 is flush with the side of the blade body 3 away from the handle 2 on the same horizontal plane, and smoothly transitions with the outer edge of the side arc of the blade head 1.

[0023] Furthermore, the thickness of the handle 2, the blade 3, and the arc-shaped rib 5 is 20-40mm.

[0024] Compared with traditional ash removal knives, this utility model can provide effective support for the upper handle 2 and the side blade head 1 and blade body 3 simultaneously through the arc-shaped rib plate 5, and at the same time set with wedge-shaped blade head 1, thereby improving the pressure resistance and bending resistance of the ash removal knife.

[0025] The ash removal blade is installed onto the grate 8, extending from below the grate 8. The rear end of the blade handle 2 is within the coverage area of ​​the grate 8, while the front end extends beyond the coverage area of ​​the grate 8. Figure 4 As shown, this utility model features a stepped constriction section 7 in the middle of the outer edge 6, which makes the front end of the handle 2 narrower than the rear end, thus increasing the contact area between the handle 2 and the upper ash layer compared to the previous method. Figure 2 The area of ​​the handle 2 of the conventional ash removal knife shown is reduced by 61%, thereby reducing the pressure of the ash layer on the handle 2 and reducing the probability of sagging deformation of the knife head 1 and the knife body 3, so that it can adapt to the high ash layer pressure and high slag breaking and ash removal requirements of large-scale coal crushing pressurized gasification furnace.

[0026] The parts not described in detail in this embodiment are existing technologies.

[0027] It should be noted that although the present invention has been described through the above embodiments, there may be other various embodiments of the present invention. Without departing from the spirit and scope of the present invention, those skilled in the art can obviously make various corresponding changes and modifications to the present invention, but all such changes and modifications should fall within the scope of protection of the appended claims and their equivalents.

Claims

1. A coal ash discharge cutter for a large-scale coal pressurized gasification furnace, comprising a cutter head (1), a cutter handle (2), a cutter body (3), and a cutter holder (4), characterized in that: The handle (2) is provided with an arc-shaped rib plate (5) perpendicular to the handle (2), one end of the arc-shaped rib plate (5) is connected with the holder (4), and the other end extends to the connecting position of the head (1) and the body (3), the thickness of the head (1) gradually increases from the top end to the connecting position of the head (1) and the body (3), and a wedge-shaped structure is formed.

2. The coal discharging knife for a large-scale coal pressurized gasifier according to claim 1, characterized in that: The side of the arc-shaped rib plate (5) away from the handle (2) is flush with the side of the body (3) away from the handle (2).

3. The coal discharging knife for a large-scale coal pressurized gasifier according to claim 2, characterized in that: The thickness of the arc-shaped rib plate (5) is 20-40mm.

4. The coal discharging knife for a large-scale coal pressurized gasifier according to claim 1, characterized in that: The side circular arc outer edge of the head (1) is smoothly connected with one side of the arc-shaped rib plate (5).

5. The coal discharging knife for a large-scale coal pressurized gasifier according to claim 4, characterized in that: The head (1) extends from one side of the handle (2) to the other side.

6. The coal discharging knife for a large-scale coal pressurized gasifier according to claim 5, characterized in that: The height of one side of the head (1) is 180-190mm, and the height of the extended part of the other side is 65-75mm.

7. The coal discharge knife for a large coal gasification pressure furnace according to claim 1, characterized by: The handle (2) is provided with an outer edge (6) composed of multiple arc-shaped segments.

8. The coal discharging knife for a large-scale coal pressurized gasifier according to claim 7, characterized in that: The middle part of the outer edge (6) is provided with a stepped contraction segment (7), so that the front end of the handle (2) has a smaller width than the rear end.

9. The coal discharge knife for a large-scale coal pressurized gasifier according to any one of claims 1 to 8, characterized in that: The handle (2) is provided with a lifting hole and an assembly bolt hole.

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