Liquid slag outlet rectification structure for liquid slag discharge boiler

Abstract

The invention discloses a liquid slag outlet rectifying structure for a liquid slag discharging boiler, and belongs to the technical field of liquid slag discharging boilers. According to the invention, the problems of cooling water splashing, scum and slag blockage caused by unorganized flowing slag, swinging flowing slag position and discontinuous flowing of the existing liquid deslagging boiler are solved, and the problems of iron separation and hydrogen separation caused by carbon deposition in molten slag are solved. The slag accretion pool is fixedly arranged at the bottommost end of the slag hopper, the cofferdam is located on the inner side of the slag hopper, the lower end of the cofferdam is fixedly arranged at an outlet of the slag hopper, a slag discharging opening is formed in the upper end of the cofferdam and communicates with the outlet of the slag hopper, a rectification opening is formed in the side, facing the slag accretion pool, of the cofferdam, and the top of the rectification opening communicates with the slag discharging opening. The bottom of the rectifying port is positioned at the lowest point of the slag accretion pool. By means of the liquid slag outlet rectifying structure, flowing slag is gathered into the slag gathering pool and flows out of the rectifying opening in order, the flowing slag is continuous and stable, and the slag discharging reliability of a liquid slag discharging boiler is greatly improved.

Description

Technical Field

[0001] The invention relates to a liquid slag outlet rectifying structure for a liquid slag discharge boiler, belonging to the technical field of liquid slag discharge boilers. Background Art

[0002] my country has abundant reserves of Zhundong coal, but it has a high alkali metal content and serious slagging and contamination problems. A large number of solid slagging boilers burning Zhundong coal have experienced varying degrees of slagging and contamination, frequent damage to the water-cooled wall of the cold ash hopper, malfunction of the slagging system, and blockage of the flue, and are forced to shut down in serious cases. Liquid slagging boilers have a high slag capture rate, which captures most of the low-melting-point alkali metal components into the slag, reduces the ash content in the flue gas, especially reduces the content of alkali metal substances, and prevents coking and contamination of the furnace and heating surface. Liquid slagging is an effective way to solve the coking and contamination problems when boilers burn strong coking coals such as Zhundong coal. However, there are very few large-scale liquid slagging boilers in my country, and there is a lack of experience. Liquid slagging is prone to poor slagging flow, splashing of cooling water, slag and slag blockage, as well as iron and hydrogen precipitation caused by carbon deposition in the slag, which seriously affects the safe operation of the boiler. This is an urgent problem to be solved in the development of liquid slagging boilers. Summary of the invention

[0003] The present invention aims to solve the problems of cooling water splashing, slag clogging and iron and hydrogen precipitation caused by carbon deposition in the molten slag in the existing liquid slag discharge boiler due to the unorganized slag flow, swinging slag flow position and discontinuous flow, and further provides a liquid slag outlet rectification structure for the liquid slag discharge boiler.

[0004] The technical solution adopted by the present invention to solve the above technical problems is:

[0005] A liquid slag outlet rectification structure for a liquid slag discharge boiler comprises a cofferdam and a slag accumulation pool arranged at the bottom of a slag hopper, wherein the slag accumulation pool is fixed at the bottom of the slag hopper, the cofferdam is located inside the slag hopper and the lower end of the cofferdam is fixed at the slag hopper outlet position, a slag discharge port is arranged at the upper end of the cofferdam and is connected to the slag hopper outlet, a rectification port is arranged on one side of the cofferdam facing the slag accumulation pool, and the top of the rectification port is connected to the slag discharge port, and the bottom of the rectification port is located at the lowest point of the slag accumulation pool.

[0006] Furthermore, the hopper outlet is located at the lower part of the side wall of the hopper, the cofferdam is a gradually narrowing structure with a thicker bottom and a thinner top, and the angle between the plane where the bottom end of the cofferdam is located and the horizontal plane is between 5° and 30°.

[0007] Furthermore, the angle between the plane where the slag discharge port is located and the horizontal direction is between 5° and 30°.

[0008] Furthermore, the rectifying port has a V-shaped port structure that is wide at the top and narrow at the bottom.

[0009] Furthermore, the V-shaped opening angle of the rectifying opening ranges from 30° to 60°.

[0010] Furthermore, the V-shaped opening angle of the rectifying opening is 45°.

[0011] Furthermore, the slag pool has a cone or wedge-shaped structure that is wide at the top and narrow at the bottom.

[0012] Furthermore, the slope of the slag pool ranges from 30° to 50°, and the depth is not less than 100 mm.

[0013] Furthermore, the slag pool and the cofferdam are integrally formed with the slag bucket.

[0014] Furthermore, the plane where the slag discharge port is located is parallel to the plane where the bottom end of the cofferdam is located.

[0015] Compared with the prior art, the present invention has the following effects:

[0016] The present invention overcomes the problems that it is difficult for a liquid slag discharge boiler to form a stable slag pool, the slag flow is disorganized, the slag flow position frequently swings, and an intermittent flow is formed, which easily causes cooling water splashing, and the slag and slag blocking problems occur. By setting a cofferdam, the liquid slag pouring down along the slag bucket is diverted and diverted to prevent the slag flow from directly rushing into the slag discharge port. The slag pool is set at the lowest position of the slag bucket. The cofferdam is tilted in the slag bucket due to the inclined structure of the inner wall of the slag bucket. The liquid slag flows downward along both sides of the cofferdam. The slag pool plays a role in gathering liquid slag to form a stable slag pool. Since the bottom of the rectifier port is located at the lowest point of the slag pool, the slag pool forms an emptyable structure, so that the slag in the slag pool is always in a state of continuous renewal, avoiding the problems of iron precipitation and hydrogen precipitation caused by the deposition of carbon-containing slag, and improving the operating safety and reliability of the liquid slag discharge boiler.

[0017] Through the liquid slag discharge port rectifying device of the present invention, the flowing slag is gathered into the slag pool and flows out from the rectifying port in an orderly manner. The slag flow is continuous and stable, which greatly improves the slag discharge reliability of the liquid slag discharge boiler. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 It is a front view schematic diagram of a liquid slag outlet rectifying structure for a liquid slag discharge boiler;

[0019] Figure 2 It is a three-dimensional structural schematic diagram of a liquid slag outlet rectifying structure for a liquid slag discharge boiler;

[0020] Figure 3 It is a three-dimensional effect schematic diagram of the liquid slag outlet rectification structure for a liquid slag discharge boiler (the tube bundle structure in the figure is only for the convenience of illustrating the outline direction of the liquid slag outlet rectification structure);

[0021] Figure 4This is a schematic diagram of the position of the liquid slag outlet rectification structure in the slag hopper for a liquid slag discharge boiler.

[0022] In the figure:

[0023] 1. Cofferdam; 2. Slag pool; 3. Slag outlet; 4. Rectification outlet; 5. Slag hopper. DETAILED DESCRIPTION

[0024] Specific implementation method 1: Combination Figure 1 to Figure 4 The technical solutions in the embodiments of the present invention are described clearly and completely. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of the present invention.

[0025] It should be noted that the descriptions of the present invention regarding directions such as "front", "back", "left", "right", "inside", "outside", "left side", "right side", "upper", "lower", "top", "bottom", etc. are all defined based on the relationship between the orientations or positions shown in the drawings. They are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the structure must be constructed and operated in a specific orientation. Therefore, they cannot be understood as limitations on the present invention. In the description of the present invention, the meaning of "multiple" is more than two, unless otherwise clearly and specifically defined.

[0026] In the description of the present invention, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a direct connection, or an indirect connection through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0027] A liquid slag outlet rectifying structure for a liquid slag discharge boiler comprises a cofferdam 1 and a slag pool 2 arranged at the bottom of a slag hopper 5, wherein the slag pool 2 is fixedly arranged at the bottom of the slag hopper 5, the cofferdam 1 is located inside the slag hopper 5 and the lower end of the cofferdam 1 is fixedly arranged at the outlet of the slag hopper 5, a slag discharge port 3 is provided at the upper end of the cofferdam 1 and is connected to the outlet of the slag hopper 5, a rectifying port 4 is provided on one side of the cofferdam 1 facing the slag pool 2, and the top of the rectifying port 4 is connected to the slag discharge port 3, and the bottom of the rectifying port 4 is located at the lowest point of the slag pool 2.

[0028] The slag hopper 5 is a part of the liquid slag discharge boiler, which is a conventional hopper-shaped structure. In the present application, the bottom outlet of the slag hopper is opened at the lower part of one side wall of the slag hopper, deviating from the central axis of the slag hopper.

[0029] The present invention overcomes the problem that it is difficult for a liquid slag discharge boiler to form a stable slag pool, the slag flow is disorganized, the slag flow position frequently swings, and an intermittent flow is formed, which easily causes cooling water splashing, and the slag and slag blocking problems occur. By setting a cofferdam 1, the liquid slag pouring down along the slag bucket 5 is diverted and guided to prevent the slag flow from directly rushing into the slag discharge port 3. The slag pool 2 is set at the lowest position of the slag bucket 5. The cofferdam 1 is tilted and arranged in the slag bucket 5 due to the inclined structure of the inner wall of the slag bucket 5. The liquid slag flows downward along both sides of the cofferdam 1. The slag pool 2 plays a role in gathering liquid slag to form a stable slag pool. Since the bottom of the rectifier port 4 is located at the lowest point of the slag pool 2, the slag pool 2 forms an emptyable structure, so that the slag in the slag pool 2 is always in a state of continuous renewal, avoiding the problems of iron precipitation and hydrogen precipitation caused by the deposition of carbon-containing slag, and improving the operating safety and reliability of the liquid slag discharge boiler.

[0030] The liquid slag flowing out of the rectifying port 4 pours out like a column, with a fixed position and stable flow, which is very conducive to the accurate granulation of the cooled slag and effectively avoids the occurrence of floating slag and slag blockage. Through the rectifying device of the liquid slag discharge port 3 of the present invention, the flowing slag is gathered in the slag pool 2 and flows out of the rectifying port 4 in an orderly manner. The flowing slag is continuous and stable, which greatly improves the reliability of the slag discharge of the liquid slag discharge boiler.

[0031] The outlet of the slag bucket 5 is located at the lower part of the side wall of the slag bucket 5. The cofferdam 1 is a gradually narrowing structure with a thicker bottom and a thinner top. The angle between the plane where the bottom end of the cofferdam 1 is located and the horizontal plane is between 5° and 30°. With such a design, the slag bucket 5 is a common gradually narrowing structure with a thicker top and a thinner bottom. The bottom end of the cofferdam 1 is connected to a side wall slope of the slag bucket 5. By designing the angle between the plane where the bottom end of the cofferdam 1 is located and the horizontal plane to be between 5° and 30°, the angle is preferably 15°. This angle is conducive to the flow of slag, but it cannot make the slag flow too fast. If the angle is too small, it is easy to cause slag accumulation. If the angle is too large, the slag flow rate is fast and a slag film of a certain thickness cannot be formed on the inner wall of the slag bucket. The inclination angle between the cofferdam 1 as a whole and the horizontal plane is the same as the inclination angle between the side wall of the slag bucket 5 and the horizontal plane.

[0032] The angle between the plane where the slag discharge port 3 is located and the horizontal direction is between 5° and 30°. With such a design, the slag discharge port 3 is inclined, so that the slag discharge port 3 has a low point, which can control the slag flow to produce a slow dumping effect, fix the slag flow position, and increase the flow stability. The angle is preferably 15°, and the plane where the slag discharge port 3 is located is parallel to the plane where the bottom end of the cofferdam 1 is located.

[0033] The rectifying port 4 is a V-shaped structure that is wide at the top and narrow at the bottom. With such a design, the slag flow can produce a nozzle effect. The slag flow is inclined like a column and does not hang on the wall, just like a column inserted into the cooling water, avoiding the splashing of cooling water, strengthening the granulation effect, and avoiding the slag phenomenon. The design of the V-shaped mouth structure can adjust the amount of slag discharged according to the change of the liquid level of the slag pool. The upper end of the V-shaped mouth structure is connected to the slag discharge port 3, which not only ensures the discharge capacity when there is a large amount of slag, but also improves the flow control ability when there is a small amount of slag. The lower end tip of the V-shaped mouth structure is connected to the lowest point of the slag pool 2, so that the slag in the slag pool 2 is always in a state of continuous renewal, and the slag in the slag pool 2 can be fully discharged when the furnace is shut down.

[0034] The V-shaped opening angle of the rectifying opening 4 is in the range of 30° to 60°. Such a design can ensure the discharge capacity when there is a large amount of slag, and improve the flow control capacity when there is a small amount of slag.

[0035] The V-shaped opening angle of the rectifying opening 4 is 45°. Such a design can ensure the discharge capacity when there is a large amount of slag, and improve the flow control capacity when there is a small amount of slag.

[0036] The slag pool 2 is a cone or wedge-shaped structure that is wide at the top and narrow at the bottom. With such a design, the top of the slag pool 2 is integrally formed and fixedly connected with the slag bucket 5.

[0037] The slope of the slag pool 2 is in the range of 30° to 50°, and the depth is not less than 100 mm. Such a design can achieve a good slag gathering effect, ensure the slag accumulation in the slag pool, increase the stability of the slag flowing out of the rectifying port 4, and reduce fluctuations.

[0038] The slag pool 2 and the cofferdam 1 are integrally formed with the slag bucket 5 .

[0039] The above description is only a preferred specific implementation manner of the present invention, but the protection scope of the present invention is not limited thereto. Any technician familiar with the technical field can make equivalent replacements or changes according to the technical scheme and inventive concept of the present invention within the technical scope disclosed by the present invention, which should be covered by the protection scope of the present invention.

Claims

1. A liquid slag outlet rectifying structure for a liquid slag discharge boiler, characterized in that: The invention comprises a cofferdam (1) and a slag pool (2) arranged at the bottom of a slag bucket (5), wherein the slag pool (2) is fixedly arranged at the bottom of the slag bucket (5), the cofferdam (1) is located inside the slag bucket (5) and the lower end of the cofferdam (1) is fixedly arranged at the outlet of the slag bucket (5), a slag discharge port (3) is provided at the upper end of the cofferdam (1) and is connected to the outlet of the slag bucket (5), a rectifying port (4) is provided on one side of the cofferdam (1) facing the slag pool (2), and the top of the rectifying port (4) is connected to the slag discharge port (3), and the bottom of the rectifying port (4) is located at the lowest point of the slag pool (2).

2. The liquid slag outlet rectifying structure for a liquid slag discharge boiler according to claim 1, characterized in that: The outlet of the hopper (5) is located at the lower part of the side wall of the hopper (5), the cofferdam (1) is a gradually narrowing structure with a thicker bottom and a thinner top, and the angle between the plane where the bottom end of the cofferdam (1) is located and the horizontal plane is between 5° and 30°.

3. A liquid slag outlet rectifying structure for a liquid slag discharge boiler according to claim 1 or 2, characterized in that: The angle between the plane where the slag discharge port (3) is located and the horizontal direction is between 5° and 30°.

4. The liquid slag outlet rectifying structure for a liquid slag discharge boiler according to claim 1, characterized in that: The rectifying port (4) is in a V-shaped port structure which is wide at the top and narrow at the bottom.

5. The liquid slag outlet rectifying structure for a liquid slag discharge boiler according to claim 4, characterized in that: The V-shaped opening angle of the rectifying opening (4) is in the range of 30° to 60°.

6. The liquid slag outlet rectifying structure for a liquid slag discharge boiler according to claim 4, characterized in that: The V-shaped opening angle of the rectifying opening (4) is 45°.

7. The liquid slag outlet rectifying structure for a liquid slag discharge boiler according to claim 1, characterized in that: The slag pool (2) is in a cone or wedge-shaped structure that is wide at the top and narrow at the bottom.

8. The liquid slag outlet rectifying structure for a liquid slag discharge boiler according to claim 7, characterized in that: The slope of the slag pool (2) is in the range of 30° to 50°, and the depth is not less than 100 mm.

9. The liquid slag outlet rectifying structure for a liquid slag discharge boiler according to claim 1, characterized in that: The slag pool (2) and the cofferdam (1) are integrally formed with the slag bucket (5).

10. The liquid slag outlet rectifying structure for a liquid slag discharge boiler according to claim 1, characterized in that: The plane where the slag discharge port (3) is located is parallel to the plane where the bottom end of the cofferdam (1) is located.

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