Internal cooling and ash removal structure and method of high-temperature dust removal equipment

Abstract

This invention relates to an internal cooling and ash discharge structure and method for a high-temperature dust removal device. The structure includes a cooling frame comprising a cooling medium pipe arranged in a frame-like manner inside the high-temperature dust removal device, with the cooling medium flowing from bottom to top; an inner ash hopper mounted on the cooling frame; an axially penetrating ash flow cavity within the inner ash hopper, the cross-sectional area of ​​which gradually decreases from top to bottom; and an outer ash dropping section and an inner ash dropping section arranged from top to bottom at the center of the ash flow cavity, which prevent high-temperature flue gas from short-circuiting through the middle of the ash flow cavity. This invention eliminates the need for a separate inner ash hopper support structure, effectively overcoming the high temperature inside the equipment, achieving a combination of support and ash discharge, with a simple overall structure, providing strong conditions for the safe operation of the equipment.

Description

Technical Field

[0001] This invention relates to the field of flue gas dust removal and waste heat recovery technology in converter steelmaking, and particularly to an internal cooling and ash discharge structure and method for a high-temperature dust removal device. Background Technology

[0002] The flue gas produced by converter oxygen blowing steelmaking is characterized by high temperature, large volume, high dust content, and very fine dust particles. Flue gas purification and cooling are essential processes in the coal gas recovery process. Because converter steelmaking is an intermittent, cyclical operation, not only does the flue gas volume fluctuate cyclically throughout the entire smelting cycle, but the flue gas temperature also fluctuates cyclically. For the ash hopper and ash chute located in the high-temperature flue gas environment, the metal wall temperature also exhibits cyclical changes from 800-900℃ to several tens of degrees.

[0003] An existing technology provides an online cooling device for dust collectors in high-temperature dust removal equipment. A dust hopper is located below the dust collector, and cooling pipes are installed inside the hopper. Both the cooling water inlet and outlet of the cooling pipes extend outside the hopper shell. This device has cooling water pipes installed outside the hopper, solely for cooling the high-temperature dust and recovering hot water; the hopper requires separate support.

[0004] Therefore, based on years of experience and practice in related industries, the inventor proposes an internal cooling and ash discharge structure and method for high-temperature dust removal equipment to overcome the shortcomings of existing technologies. Summary of the Invention

[0005] The purpose of this invention is to provide an internal cooling and ash discharge structure and method for a high-temperature dust removal device. This invention eliminates the need for a separate internal ash hopper support structure, effectively overcomes the high temperature inside the device, and achieves a combination of cooling, support, and ash discharge. The overall structure is simple and provides strong conditions for the safe operation of the device.

[0006] The objective of this invention is achieved by providing an internal cooling and ash discharge structure for a high-temperature dust removal device, comprising:

[0007] The cooling frame includes a cooling medium pipe arranged in a frame-like manner inside the high-temperature dust removal equipment, wherein the cooling medium in the cooling medium pipe flows from bottom to top.

[0008] An inner ash hopper is mounted on the cooling frame; an axially penetrating ash flow cavity is provided inside the inner ash hopper, and the cross-sectional area of ​​the ash flow cavity gradually decreases from top to bottom; an outer ash drop section and an inner ash drop section are provided from top to bottom at the center of the ash flow cavity, and the outer ash drop section and the inner ash drop section are used to prevent high-temperature flue gas from short-circuiting through the middle of the ash flow cavity.

[0009] In a preferred embodiment of the present invention, at least one inner partition plate is provided at the upper part of the ash flow cavity, the inner partition plate being used to prevent the ash in the inner ash hopper from being rolled up by the flue gas.

[0010] In a preferred embodiment of the present invention, an observation hole is provided at the top of the outer dust collection part, and an observation hole cover plate that can be opened and closed is provided at the observation hole.

[0011] In a preferred embodiment of the present invention, a vertical partition plate facing the flue gas side is provided on the observation hole cover plate.

[0012] In a preferred embodiment of the present invention, the outer dust collection section is a frustum-shaped grid structure or a cylindrical grid structure.

[0013] In a preferred embodiment of the present invention, the inner dust collection section is a soft windproof curtain structure.

[0014] In a preferred embodiment of the present invention, the soft windbreak structure is made of a swaying multi-layer chain structure or a swaying multi-layer tube structure.

[0015] In a preferred embodiment of the present invention, a support block is provided on the outer wall of the cooling medium pipe, and the inner ash hopper is supported on the support block.

[0016] In a preferred embodiment of the present invention, the support block is a circular rib or a semi-circular rib.

[0017] In a preferred embodiment of the present invention, the upper part of the inner ash hopper is bowl-shaped.

[0018] The objective of this invention can also be achieved as follows: a method for internal cooling and ash discharge of a high-temperature dust removal device, comprising: setting the aforementioned internal cooling and ash discharge structure of the high-temperature dust removal device inside the high-temperature dust removal device; continuously filling the cooling medium pipe with cooling medium, the cooling medium flowing from bottom to top; the ash flow in the high-temperature dust removal device flowing into the ash flow cavity; the ash flow flowing downward through the annular space between the outer ash drop section and the inner wall of the inner ash hopper, and the annular space between the inner ash drop section and the inner wall of the inner ash hopper to the bottom of the inner ash hopper.

[0019] As described above, the internal cooling and ash removal structure and method of the high-temperature dust removal equipment of the present invention have the following beneficial effects:

[0020] In this invention, the cooling frame formed by the cooling medium pipes ensures the supporting strength of the inner ash hopper and increases the amount of waste heat recovery; the outer and inner ash dropping sections inside the inner ash hopper prevent high-temperature flue gas from "short-circuiting" and avoid a large amount of flue gas passing through the middle of the inner ash hopper instead of passing through the dust removal unit. At the same time, the outer and inner ash dropping sections ensure smooth ash dropping. This invention does not require a separate inner ash hopper support structure, effectively overcomes the high temperature inside the equipment, achieves a combination of support and ash discharge, has a simple overall structure, and provides strong conditions for the safe operation of the equipment. Attached Figure Description

[0021] The accompanying drawings are intended only to illustrate and explain the present invention and do not limit the scope of the invention.

[0022] in:

[0023] Figure 1 : This is a schematic diagram of the internal cooling and ash discharge structure of the high-temperature dust removal equipment of the present invention.

[0024] Figure 2 : This is a top view of the inner ash hopper of the present invention.

[0025] In the picture:

[0026] 1. Cooling frame; 11. Cooling medium pipe;

[0027] 2. Inner ash hopper; 20. Inner partition plate; 21. Outer ash collection section; 22. Inner ash collection section; 23. Observation hole; 24. Observation hole cover plate;

[0028] 3. Support block. Detailed Implementation

[0029] To provide a clearer understanding of the technical features, objectives, and effects of the present invention, specific embodiments of the present invention will now be described with reference to the accompanying drawings.

[0030] The specific embodiments of the present invention described herein are for illustrative purposes only and should not be construed as limiting the invention in any way. Under the teachings of this invention, those skilled in the art can conceive of any possible modifications based on the invention, all of which should be considered within the scope of the invention. It should be noted that when an element is referred to as being "set on" another element, it can be directly on the other element or there may be an intervening element. When an element is referred to as being "connected" to another element, it can be directly connected to the other element or there may be an intervening element. The terms "mounted," "connected," and "linked" should be interpreted broadly; for example, they can refer to mechanical or electrical connections, or internal communication between two elements, and can be direct or indirect connections through an intermediate medium. Those skilled in the art can understand the specific meaning of the above terms according to the specific circumstances. The terms "vertical," "horizontal," "upper," "lower," "left," "right," and similar expressions used herein are for illustrative purposes only and do not represent the only possible embodiments.

[0031] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs. The terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the application. The term "and / or" as used herein includes any and all combinations of one or more of the associated listed items.

[0032] like Figure 1 , Figure 2 As shown, the present invention provides an internal cooling and ash discharge structure for a high-temperature dust removal device, which is located below the dust collector (existing technology), and includes:

[0033] The cooling frame 1 includes a cooling medium pipe 11 arranged in a frame-like manner inside the high-temperature dust removal equipment. The cooling medium in the cooling medium pipe 11 flows from bottom to top, creating conditions for natural circulation of the cooling medium. The cooling frame 1, through which the cooling medium flows, can effectively reduce deformation caused by high temperature and reduce the impact of the high-temperature environment on the support (cooling frame 1), thereby ensuring the strength of the support. Furthermore, the cooling medium in the cooling medium pipe 11 recovers some of the waste heat inside the equipment during its flow, increasing the amount of waste heat recovered.

[0034] The inner ash hopper 2 is mounted on the cooling frame 1, which is composed of cooling medium pipes 11. While providing support, it avoids deformation caused by high temperature and ensures support stability. An axially penetrating ash flow cavity is set inside the inner ash hopper 2. The cross-sectional area of ​​the ash flow cavity gradually decreases from top to bottom. An outer ash drop section 21 and an inner ash drop section 22 are set from top to bottom at the center of the ash flow cavity. The outer ash drop section 21 and the inner ash drop section 22 are used to prevent high-temperature flue gas from short-circuiting through the middle of the ash flow cavity.

[0035] The ash in the high-temperature dust removal equipment flows from top to bottom into the inner ash hopper 2. The cooling frame 1, which is composed of cooling medium pipes 11, ensures the support strength of the inner ash hopper 2 and increases the amount of waste heat recovery.

[0036] The outer ash collection section 21 and the inner ash collection section 22 of the inner ash hopper prevent high-temperature flue gas from "short-circuiting" and avoid a large amount of flue gas from passing through the middle of the inner ash hopper instead of passing through the dust removal unit. At the same time, the outer ash collection section 21 and the inner ash collection section 22 can make the ash collection smooth.

[0037] The internal cooling and ash discharge structure of the high-temperature dust removal equipment of the present invention features a cooling frame composed of cooling medium pipes that ensures the support strength of the inner ash hopper and increases the amount of waste heat recovery. The outer and inner ash discharge sections within the inner ash hopper prevent high-temperature flue gas from "short-circuiting," avoiding a large amount of flue gas from passing through the middle of the inner ash hopper instead of the dust removal unit. At the same time, the outer and inner ash discharge sections ensure smooth ash discharge. The internal cooling and ash discharge structure of the high-temperature dust removal equipment of the present invention eliminates the need for a separate inner ash hopper support structure, effectively overcomes the high temperature inside the equipment, achieves a combination of support and ash discharge, has a simple overall structure, and provides strong conditions for the safe operation of the equipment.

[0038] Furthermore, such as Figure 1 , Figure 2 As shown, at least one inner partition plate 20 is provided at the upper part of the ash flow chamber. In this embodiment, there are multiple inner partition plates 20, which are arranged circumferentially between the inner wall of the inner ash hopper 2 and the outer ash discharge section 21. The inner partition plates 20 are used to prevent the ash in the inner ash hopper from being rolled up by the high-temperature flue gas. The number of inner partition plates 20 can be odd or even, and the specific number is determined according to actual needs.

[0039] Furthermore, such as Figure 1 , Figure 2 As shown, an observation hole 23 is provided at the top of the outer ash collection section 21, and an observation hole cover 24 that can be opened and closed is provided at the observation hole 23. In addition to being used to observe the internal condition of the inner ash hopper 2 during maintenance, the observation hole 23 is also used for cleaning large ash clumps during maintenance.

[0040] Furthermore, to extend the lifespan of the observation hole cover 24 and reduce the erosion of the observation hole cover surface by dusty flue gas, vertical partition plates facing the flue gas side are provided on the observation hole cover 24. The specific number is determined according to actual needs. The shape of the partitions created by the vertical partition plates can be rectangular, honeycomb, or other shapes.

[0041] Furthermore, the outer dust collection section 21 is a frustum-shaped grid structure or a cylindrical grid structure, or other structures that can meet the requirements for supporting the observation hole and dust collection.

[0042] Furthermore, the inner dust collection section 22 is a soft windbreak curtain structure. In a specific embodiment of the present invention, the soft windbreak curtain structure is made of a swaying multi-layer chain structure, or a swaying multi-layer tube structure, or other swaying windbreak structures that facilitate dust collection and can operate under high-temperature conditions.

[0043] Furthermore, such as Figure 1 As shown, a support block 3 is provided on the outer wall of the cooling medium pipe 11, and the inner ash hopper 2 is supported on the support block 3. In a specific embodiment of the present invention, the support block 3 is a circular rib, a semi-circular rib, or other shapes.

[0044] Considering the different thermal expansion of the inner ash hopper 2 and the cooling medium pipe 11, when the inner ash hopper 2 is installed in a cold state, it is welded to the support block 3 (rooting structure) of the cooling medium pipe 11. It is required that there be a gap between the inner ash hopper 2 and the lower header and the lower header support (existing technology) to absorb the different thermal expansion.

[0045] The cooling medium pipe 11 can be symmetrical or asymmetrical;

[0046] The cooling medium pipe 11 can be cooled by vaporization, water, or other cooling media.

[0047] Anti-wear plates may or may not be installed on the cooling medium pipe 11; fins may or may not be installed on the cooling medium pipe 11.

[0048] Furthermore, the inner ash hopper 2 can be a single layer, or a double layer or a multi-layer inner ash hopper; the upper part of the inner ash hopper 2 is set in a bowl shape, and the outer edge of the bowl shape is supported on the cooling frame 1.

[0049] The present invention also provides an internal cooling and ash discharge method for a high-temperature dust removal device, comprising: setting the aforementioned internal cooling and ash discharge structure for the high-temperature dust removal device inside the high-temperature dust removal device; continuously filling the cooling medium pipe 11 with cooling medium; the cooling medium flowing from bottom to top to achieve cooling of the cooling frame 1; the ash inside the high-temperature dust removal device flowing from top to bottom into the ash flow cavity; the ash flow passing through the annular space between the outer ash drop section 21 and the inner wall of the inner ash hopper, and the annular space between the inner ash drop section 22 and the inner wall of the inner ash hopper, flowing downward to the bottom of the inner ash hopper 2.

[0050] As described above, the internal cooling and ash removal structure and method of the high-temperature dust removal equipment of the present invention have the following beneficial effects:

[0051] In this invention, the cooling frame formed by the cooling medium pipes ensures the supporting strength of the inner ash hopper and increases the amount of waste heat recovery; the outer and inner ash dropping sections inside the inner ash hopper prevent high-temperature flue gas from "short-circuiting" and avoid a large amount of flue gas passing through the middle of the inner ash hopper instead of passing through the dust removal unit. At the same time, the outer and inner ash dropping sections ensure smooth ash dropping. This invention does not require a separate inner ash hopper support structure, effectively overcomes the high temperature inside the equipment, achieves a combination of support and ash discharge, has a simple overall structure, and provides strong conditions for the safe operation of the equipment.

[0052] The above description is merely an illustrative embodiment of the present invention and is not intended to limit the scope of the invention. Any equivalent changes and modifications made by those skilled in the art without departing from the concept and principles of the present invention should fall within the scope of protection of the present invention.

Claims

1. An internal cooling and ash discharge structure for a high-temperature dust removal device, characterized in that, include, The cooling frame includes a cooling medium pipe arranged in a frame-like manner inside the high-temperature dust removal equipment, wherein the cooling medium in the cooling medium pipe flows from bottom to top. An inner ash hopper is mounted on the cooling frame; an axially penetrating ash flow cavity is provided inside the inner ash hopper, and the cross-sectional area of ​​the ash flow cavity gradually decreases from top to bottom; an outer ash drop section and an inner ash drop section are provided from top to bottom at the center of the ash flow cavity, and the outer ash drop section and the inner ash drop section are used to prevent high-temperature flue gas from short-circuiting through the middle of the ash flow cavity; At least one inner partition plate is provided at the upper part of the ash flow chamber, and the inner partition plate is used to prevent the ash in the inner ash hopper from being rolled up by the flue gas. The outer dust collection section is a frustum-shaped grid structure or a cylindrical grid structure; The inner dust collection section is a soft windproof curtain structure; The soft windbreak curtain structure is made of a multi-layered chain structure that can sway, or a multi-layered tube structure that can sway.

2. The internal cooling and ash discharge structure of the high-temperature dust removal equipment as described in claim 1, characterized in that, An observation hole is provided at the top of the outer dust collection section, and an observation hole cover plate that can be opened and closed is provided at the observation hole.

3. The internal cooling and ash discharge structure of the high-temperature dust removal equipment as described in claim 2, characterized in that, The observation hole cover is provided with a vertical partition plate facing the flue gas side.

4. The internal cooling and ash discharge structure of the high-temperature dust removal equipment as described in claim 1, characterized in that, The outer wall of the cooling medium pipe is provided with a support block, and the inner ash hopper is supported on the support block.

5. The internal cooling and ash discharge structure of the high-temperature dust removal equipment as described in claim 4, characterized in that, The support block is a circular rib or a semi-circular rib.

6. The internal cooling and ash discharge structure of the high-temperature dust removal equipment as described in claim 1, characterized in that, The upper part of the inner ash hopper is bowl-shaped.

7. A method for internal cooling and ash removal in a high-temperature dust removal device, characterized in that, The high-temperature dust removal equipment includes an internal cooling and ash discharge structure as described in any one of claims 1 to 6, wherein a cooling medium is continuously filled into the cooling medium pipe and flows from bottom to top; the ash flow in the high-temperature dust removal equipment flows into the ash flow cavity, and the ash flow flows downward to the bottom of the inner ash hopper through the annular space between the outer ash dropping part and the inner wall of the inner ash hopper and the annular space between the inner ash dropping part and the inner wall of the inner ash hopper.

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