Gasifier and stirring arm of gasifier stirring device

Abstract

The present invention discloses a stirring arm of a stirring device of a gasifier, comprising: a shell; and a partition plate, which is arranged in the shell and divides the internal space of the shell into a first cooling chamber and a second cooling chamber, wherein the partition plate is a wavy corrugated plate. In the present invention, since the partition plate in the stirring arm is a wavy corrugated plate, the cooling fluid will form a strong turbulent flow in the cooling chamber of the stirring arm under the action of the corrugated plate, thereby improving the heat exchange efficiency of the stirring arm, thereby improving the service life of the stirring arm. In addition, in some exemplary embodiments of the present invention, a layer of wear-resistant material is arranged on the outside of the stirring arm, thereby improving the wear resistance of the stirring arm, thereby further improving the service life of the stirring arm.

Description

Technical Field

[0001] The invention relates to a stirring arm of a stirring device of a gasifier and a gasifier comprising the stirring arm. Background Art

[0002] For a fixed bed gasifier used for coal gasification, a stirring device for stirring raw coal is usually installed therein. By using the stirring device, the fixed bed gasifier can not only gasify non-sticky coal and weakly sticky coal, but also medium-sticky coal and strong-sticky coal, greatly improving the range of coal types that can be gasified by the fixed bed gasifier. At the same time, the use of the stirring device can reduce the temperature fluctuation range of the outlet coal gas and prevent partial burning in the furnace, thereby improving the gasification efficiency.

[0003] In the prior art, the stirring device generally includes a plurality of blade-shaped stirring arms, a fixing device for mounting the stirring arms, and a driving shaft connected to the fixing device. When the driving shaft rotates, the fixing device and the stirring arms mounted thereon rotate together with the driving shaft, thereby stirring the raw coal in the gasifier. As the core and key component of the stirring device, the quality and performance of the stirring arm directly determines the service life of the entire stirring device, and ultimately affects the process operation performance of the entire gasifier.

[0004] Since the working environment temperature of the stirring arm is high, the stirring arm needs to be cooled. The existing stirring arm generally includes a shell and a partition plate (or baffle plate) arranged in the shell, and the partition plate divides the internal space of the shell into a first cooling chamber and a second cooling chamber. The cooling fluid flows into the stirring arm from the inlet of the first cooling chamber and flows out from the outlet of the second cooling chamber, thereby cooling the stirring arm.

[0005] However, in the prior art, the partition plate in the stirring arm is a simple straight flat plate, which results in poor heat exchange effect of the stirring arm. In addition, the working environment of the stirring arm is also characterized by strong corrosion and high wear, but in the prior art, there is no anti-wear material layer on the outside of the stirring arm. Therefore, in the prior art, the stirring arm of the stirring device of the fixed bed gasifier often breaks and leaks after a short period of operation, which reduces the service life of the stirring device and seriously affects the normal use of the entire stirring device. Summary of the invention

[0006] The purpose of the present invention is to solve at least one aspect of the above-mentioned problems and defects in the prior art.

[0007] According to one aspect of the present invention, a stirring arm of a gasifier stirring device is provided, comprising: a shell; and a partition plate, which is arranged in the shell and divides the internal space of the shell into a first cooling chamber and a second cooling chamber, wherein the partition plate is a wavy corrugated plate.

[0008] According to an exemplary embodiment of the present invention, the shell includes a base material layer located at its innermost side, a wear-resistant material layer located at its outermost side, and an anti-corrosion material layer located between the base material layer and the wear-resistant material layer.

[0009] According to another exemplary embodiment of the present invention, the wear-resistant material layer is welded to the surface of the corrosion-resistant material layer by intermittent spot welding.

[0010] According to another exemplary embodiment of the present invention, the shape of the welding spot on the wear-resistant material layer is circular, elliptical, triangular, rectangular or star-shaped.

[0011] According to another exemplary embodiment of the present invention, the welding spots on the wear-resistant material layer are evenly distributed on the entire surface of the wear-resistant material layer.

[0012] According to another exemplary embodiment of the present invention, a cross section of the partition plate along the width direction of the stirring arm is S-shaped.

[0013] According to another exemplary embodiment of the present invention, a cross section of the partition plate along the length direction of the stirring arm is S-shaped.

[0014] According to another exemplary embodiment of the present invention, the upper and lower sides of the partition plate are respectively welded to the inner wall of the shell.

[0015] According to another exemplary embodiment of the present invention, there is a gap between the top end of the partition plate and the inner wall of the shell, and the first cooling chamber and the second cooling chamber are connected to each other via the gap.

[0016] According to another exemplary embodiment of the present invention, the first cooling chamber has a cooling fluid inlet, and the second cooling chamber has a cooling fluid outlet; the cooling fluid flows into the first cooling chamber from the cooling fluid inlet, and flows out of the second cooling chamber through the cooling fluid outlet.

[0017] According to another exemplary embodiment of the present invention, the volume of the first cooling chamber is smaller than the volume of the second cooling chamber.

[0018] According to another aspect of the present invention, a gasifier is provided, comprising the aforementioned stirring arm.

[0019] In the aforementioned exemplary embodiments according to the present invention, the partition plate in the stirring arm is a wavy plate. Therefore, under the action of the wavy plate, the cooling fluid will form a strong turbulent flow in the cooling chamber of the stirring arm, thereby improving the heat exchange efficiency of the stirring arm and thus increasing the service life of the stirring arm.

[0020] In addition, in some exemplary embodiments of the present invention, a layer of wear-resistant material is provided on the outside of the stirring arm, so as to improve the wear resistance of the stirring arm, thereby further improving the service life of the stirring arm.

[0021] Other objects and advantages of the present invention will become apparent from the following description of the present invention with reference to the accompanying drawings, which will help to provide a comprehensive understanding of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 A front view showing a stirring device for a gasifier according to an exemplary embodiment of the present invention;

[0023] Figure 2 A top view showing a stirring device for a gasifier according to an exemplary embodiment of the present invention;

[0024] Figure 3 Display the edge of the stirring arm Figure 2 A cross-sectional view taken along the AA direction as shown; and

[0025] Figure 4 show Figure 3 An enlarged schematic diagram of a local surface of the stirring arm is shown. DETAILED DESCRIPTION

[0026] The technical solution of the present invention is further specifically described below by examples and in conjunction with the accompanying drawings. In the specification, the same or similar reference numerals indicate the same or similar components. The following description of the embodiments of the present invention with reference to the accompanying drawings is intended to explain the overall inventive concept of the present invention and should not be construed as a limitation of the present invention.

[0027] In addition, in the detailed description below, for ease of explanation, many specific details are set forth to provide a comprehensive understanding of the disclosed embodiments. However, it is apparent that one or more embodiments may be implemented without these specific details. In other cases, known structures and devices are embodied in a schematic manner to simplify the accompanying drawings.

[0028] According to an overall technical concept of the present invention, a stirring arm of a gasifier stirring device is provided, comprising: a shell; and a partition plate, which is arranged in the shell and divides the internal space of the shell into a first cooling chamber and a second cooling chamber, wherein the partition plate is a wavy corrugated plate.

[0029] Figure 1 A front view showing a stirring device for a gasifier according to an exemplary embodiment of the present invention; Figure 2 A top view showing a stirring device for a gasifier according to an exemplary embodiment of the present invention.

[0030] like Figure 1 and Figure 2 As shown, in the illustrated embodiment, the stirring device of the gasifier generally includes a plurality of blade-shaped stirring arms 100, a fixing device 200 for installing and fixing the plurality of stirring arms 100, and a driving shaft (not shown) for driving the stirring arms 100 and the fixing device 200 to rotate together.

[0031] like Figure 1 and Figure 2 As shown, in the illustrated embodiment, the fixing device 200 includes an outer cylinder 210 and a fixing frame 220 fixed inside the outer cylinder 210. The base of the stirring arm 100 is fixed to the fixing frame 220, for example, welded to the fixing frame 220. The blade-shaped main body of the stirring arm 100 is supported on the outer cylinder 210 and extends from the outer cylinder 210. The blade-shaped main body of the stirring arm 100 can be directly fixed to the outer cylinder 210, for example, welded to the outer cylinder 210.

[0032] Figure 3 The edge of the stirring arm 100 is shown Figure 2 The cross-sectional view is taken along the AA direction (ie, the width direction of the stirring arm).

[0033] like Figure 1 , Figure 2 and Figure 3 As shown, in the illustrated embodiment, the stirring arm 100 mainly includes a shell 110 and a partition plate (or baffle plate) 120. The partition plate 120 is disposed in the shell 110 to divide the internal space of the shell 110 into a first cooling chamber 101 and a second cooling chamber 102.

[0034] like Figure 3 As shown, in the illustrated embodiment, the cross section of the partition plate 120 along the width direction of the stirring arm 100 is S-shaped. However, please note that the present invention is not limited to the illustrated embodiment. For example, in another embodiment of the present invention, the cross section of the partition plate 120 along the length direction of the stirring arm 100 is S-shaped.

[0035] Please continue to see Figure 3 In the illustrated embodiment, the shell 110 of the stirring arm 100 includes a base material layer 111 located at its innermost side, a wear-resistant material layer 113 located at its outermost side, and an anti-corrosion material layer 112 located between the base material layer 111 and the wear-resistant material layer 113 .

[0036] Figure 4 show Figure 3 The schematic diagram of the partial surface of the stirring arm 100 is shown.

[0037] like Figure 3 and Figure 4 As shown, in the illustrated embodiment, the wear-resistant material layer 113 is welded to the surface of the corrosion-resistant material layer 112 in an intermittent spot welding manner. That is, the welding points 113a on the wear-resistant material layer 113 are discontinuous.

[0038] like Figure 3 and Figure 4 As shown, in the illustrated embodiment, the shape of the weld 113a on the wear-resistant material layer 113 is roughly elliptical, but the present invention is not limited to the illustrated embodiment, and the weld 113a on the wear-resistant material layer 113 may also be circular, triangular, rectangular, star-shaped or any other suitable geometric shape.

[0039] like Figure 3 and Figure 4 As shown, in the illustrated embodiment, the welding points 113 a on the wear-resistant material layer 113 are evenly distributed over the entire surface of the wear-resistant material layer 113 .

[0040] In the illustrated embodiment, since the wear-resistant material layer 113 is welded to the surface of the corrosion-resistant material layer 112 by intermittent spot welding, not only can the bonding strength between the wear-resistant material layer 113 and the corrosion-resistant material layer 112 be guaranteed, but also the heat exchange effect of the entire stirring arm 100 will not be significantly reduced.

[0041] like Figure 3 As shown, in the illustrated embodiment, the upper and lower sides of the partition plate 120 can be welded to the inner wall of the housing 100 respectively.

[0042] like Figure 2 As shown, in the illustrated embodiment, there is a gap between the top end of the partition plate 120 and the inner wall of the housing 100, and the first cooling chamber 101 and the second cooling chamber 102 can be connected to each other through the gap.

[0043] Please continue to see Figure 2 In the illustrated embodiment, the first cooling chamber 101 has a cooling fluid inlet 221 and the second cooling chamber 102 has a cooling fluid outlet 222. The cooling fluid flows into the first cooling chamber 101 from the cooling fluid inlet 221 and flows out of the second cooling chamber 102 through the cooling fluid outlet 222.

[0044] like Figure 3As shown, in one embodiment of the present invention, the volume of the first cooling chamber 101 is smaller than the volume of the second cooling chamber 102, and the flow rate of the cooling fluid in the first cooling chamber 101 is greater than the flow rate in the second cooling chamber 102. This is because the wear force to which the stirring arm portion corresponding to the first cooling chamber 101 is subjected during operation is greater than the wear force to which the stirring arm portion corresponding to the second cooling chamber 102 is subjected during operation. Therefore, the flow rate of the cooling fluid in the first cooling chamber 101 with a smaller volume is greater than the flow rate in the second cooling chamber 102 with a larger volume, thereby improving the heat exchange effect between the stirring arm and the portion corresponding to the first cooling chamber 101, so that the portion of the stirring arm corresponding to the first cooling chamber 101 can be fully cooled, thereby improving the service life of the stirring arm. Therefore, in one embodiment of the present invention, the heat exchange effect of the stirring arm 100 can be optimized by reasonably designing the volume ratio of the first cooling chamber 101 and the second cooling chamber 102.

[0045] Although not shown in the drawings, in another embodiment of the present invention, a gasifier is disclosed. The gasifier includes a stirring device having the aforementioned stirring arm 100 .

[0046] In the above-mentioned embodiment of the present invention, by changing the existing straight partition plate into a wavy partition plate and adding a layer of wear-resistant material on the outside of the stirring arm, the normal service life of the stirring arm can be greatly improved, thereby greatly improving the service life of the entire stirring device in the gasifier. In addition, the structure of the stirring arm of the present invention is very simple and maintenance is convenient and quick.

[0047] Those skilled in the art can understand that the embodiments described above are exemplary and can be improved by those skilled in the art. The structures described in various embodiments can be freely combined without causing conflicts in structure or principle.

[0048] Although the present invention has been described in conjunction with the accompanying drawings, the embodiments disclosed in the accompanying drawings are intended to exemplify the preferred implementations of the present invention and should not be construed as limiting the present invention.

[0049] Although some embodiments of the present general inventive concept have been shown and described, it will be appreciated by those skilled in the art that changes may be made to these embodiments without departing from the principles and spirit of the present general inventive concept, the scope of which is defined by the claims and their equivalents.

[0050] It should be noted that the word "comprising" does not exclude other elements or steps, and the word "a" or "an" does not exclude a plurality. In addition, any element reference signs in the claims shall not be construed as limiting the scope of the present invention.

Claims

1. A stirring arm of a gasifier stirring device, comprising: Housing (110); and a partition plate (120) disposed in the housing (110) to partition the internal space of the housing (110) into a first cooling chamber (101) and a second cooling chamber (102); Features: The partition plate (120) is a corrugated plate in a wavy shape; wherein the cross section of the partition plate (120) along the width direction of the stirring arm (100) is a smooth single S-shape, or the cross section of the partition plate (120) along the length direction of the stirring arm (100) is a smooth single S-shape; the upper and lower sides of the partition plate (120) are respectively welded to the inner wall of the shell (100); A gap is provided between the top end of the partition plate (120) and the inner wall of the shell (100), and the first cooling chamber (101) and the second cooling chamber (102) are connected to each other via the gap; The first cooling chamber (101) has a cooling fluid inlet (221), and the second cooling chamber (102) has a cooling fluid outlet (222); The cooling fluid flows into the first cooling chamber (101) from the cooling fluid inlet (221), and flows out of the second cooling chamber (102) through the cooling fluid outlet (222); The volume of the first cooling chamber (101) is smaller than the volume of the second cooling chamber (102).

2. The stirring arm of the stirring device for a gasifier according to claim 1, characterized in that: The shell (110) comprises a base material layer (111) located at its innermost side, a wear-resistant material layer (113) located at its outermost side, and an anti-corrosion material layer (112) located between the base material layer (111) and the wear-resistant material layer (113).

3. The stirring arm of the stirring device for a gasifier according to claim 2, characterized in that: The wear-resistant material layer (113) is welded to the surface of the corrosion-resistant material layer (112) by intermittent spot welding.

4. The stirring arm of the stirring device for a gasifier according to claim 3, characterized in that: The shape of the welding spot (113a) on the wear-resistant material layer (113) is circular, elliptical, triangular, rectangular or star-shaped.

5. The stirring arm of the stirring device for a gasifier according to claim 3, characterized in that: The welding spots (113a) on the wear-resistant material layer (113) are evenly distributed over the entire surface of the wear-resistant material layer (113).

6. A gasifier, characterized in that: The gasifier comprises the stirring arm (100) according to any one of the preceding claims 1-5.

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