Slag tapping hole structure of liquid-state slag tapping gasifier and liquid-state slag tapping gasifier

Abstract

The utility model discloses a slag tapping opening structure of a liquid slagging gasification furnace and the liquid slagging gasification furnace, the slag tapping opening structure of the liquid slagging gasification furnace comprises a slag tapping opening main body which is arranged at the bottom of a combustion chamber of the gasification furnace, the slag tapping opening main body comprises a coil pipe, and the coil pipe is coiled to form a cylinder body with a hollow channel; the protective layer is arranged at the position, close to the bottom of the cylinder body, of the inner wall of the cylinder body, the bottom of the cylinder body is provided with a bent part which is bent outwards from the bottom of the cylinder body, a supporting plate is installed on the lower portion of the slag tapping opening body, a fireproof layer is arranged between the supporting plate and the bent part, and the fireproof layer is arranged between the supporting plate and the bent part. The end, close to the fireproof layer, of the protection layer is smoothly attached to the coil pipe. The protective layer is arranged at the bottom of the cylinder body, so that the coil pipe is prevented from being directly scoured by molten slag, part of high-temperature raw gas and steam, the service life of the slag tapping hole structure is prolonged, and the safety performance is improved.

Description

Technical Field

[0001] The utility model relates to the technical field of gasifier slag removal, in particular to a lower slag opening structure of a liquid slag removal gasifier and the liquid slag removal gasifier. Background Art

[0002] Gasifiers have been widely used in the coal chemical industry due to their many advantages, such as high carbon conversion rate, high operating pressure, high operating temperature, strong adaptability to coal types and high effective gas yield. The upper part of the gasifier is a combustion chamber, where coal gasification reaction takes place, and the lower part is a quenching chamber, where the raw coal gas and ash produced by gasification are cooled and separated. The lower slag port is a component connecting the combustion chamber and the quenching chamber of the gasifier, and is a key part of the gasifier. The lower slag port provides a channel for high-temperature molten liquid slag and high-temperature raw coal gas to enter the quenching chamber for solid-liquid separation, dust removal and cooling.

[0003] The lower slag outlet of the gasifier in the prior art is coiled into a cylindrical shape, and the cylinder adopts a segmented stepped structure design, and the inner wall of the cylinder is provided with a high-temperature resistant coating. The high-temperature molten liquid slag and the high-temperature raw coal gas diffuse in the cylinder, and the high-temperature raw coal gas and the high-temperature molten liquid slag flowing out of the lower slag outlet are scattered streams, causing part of the high-temperature raw coal gas and steam to swirl at the bottom of the lower slag outlet. The high-temperature raw coal gas and steam continuously erode the coil at the bottom of the lower slag outlet, which can easily cause the refractory coating at the bottom of the lower slag outlet to fall off, and the coil is eroded by the high-temperature molten liquid slag for a long time, which can easily cause the coil to leak. Utility Model Content

[0004] The utility model aims to at least solve the technical problem in the prior art that the coils are easily leaked due to long-term erosion of the bottom coils at the slag outlet by high-temperature raw coal gas and steam and scouring by high-temperature molten liquid slag.

[0005] To this end, one object of the utility model is to provide a slag outlet structure of a liquid slag discharge gasifier, the slag outlet structure of the liquid slag discharge gasifier comprising:

[0006] A lower slag outlet body is arranged at the bottom of the combustion chamber of the gasifier, and the lower slag outlet body includes a coil, and the coil is wound to form a cylinder with a hollow channel;

[0007] A protective layer is arranged on the inner wall of the cylinder near the bottom of the cylinder, the bottom of the cylinder has a bent portion bent outward from the bottom of the cylinder, a support plate is installed at the lower part of the lower slag outlet body, a refractory layer is arranged between the support plate and the bent portion, and the end of the protective layer close to the refractory layer is smoothly fitted with the coil.

[0008] In some embodiments, the bottom of the cylinder has a protective layer mounting portion, the protective layer is arranged on the side of the protective layer mounting portion and the bending portion facing the center of the cylinder, and multiple fixings are installed on the side of the protective layer close to the center of the cylinder, and the multiple fixings are arranged at intervals.

[0009] In some embodiments, a connecting notch is provided on a side of the protective layer facing the coil, the connecting notch is located between two adjacent coils, a connecting piece is installed in the connecting notch, and two ends of the connecting piece are respectively connected to the two adjacent coils.

[0010] In some embodiments, a limiting portion is further provided on the top of the protective layer, and the limiting portion is formed by extending from the coil toward the center of the cylinder.

[0011] In some embodiments, two adjacent coils are connected via a connecting plate.

[0012] In some embodiments, the inner wall of the cylinder is further provided with an inner wall coating, and the protective layer is located between the coil and the inner wall coating.

[0013] In some embodiments, the lower slag outlet structure further includes a water inlet and a water outlet, and the water inlet and the water outlet are respectively installed on both sides of the cylinder, and the water inlet and the water outlet have different heights.

[0014] In some embodiments, the protective layer is a nickel-based alloy protective layer;

[0015] The coil is a chrome-molybdenum steel coil.

[0016] Another object of the utility model is to provide a liquid slag discharge gasifier, including the above-mentioned slag outlet structure of the liquid slag discharge gasifier.

[0017] The embodiment of the utility model provides a slag outlet structure of a liquid slag discharge gasifier and a liquid slag discharge gasifier, which has the following beneficial effects:

[0018] (1) A protective layer is provided at the bottom of the cylinder to prevent the high-temperature molten liquid slag, some high-temperature raw coal gas and steam from directly scouring the coil, thereby extending the service life of the slag outlet structure and improving safety performance;

[0019] (2) The bottom of the cylinder has a protective layer installation portion and a bent portion bent outward from the bottom of the cylinder. The protective layer is arranged on the side of the protective layer installation portion and the bent portion facing the center of the cylinder. The protective layer is arranged at multiple positions on the bottom of the cylinder to improve the protective effect of the protective layer on the coil. The fixing part is installed on the protective layer to reinforce the coil. The fixing part is not in direct contact with the coil, which reduces the risk of crack defects in the coil base material caused by inappropriate welding current when welding the stud of the fixing part.

[0020] (3) The protective layer has a regular shape and is smoothly connected to the refractory layer, making it easy to cast, solidify and harden the refractory material, ensuring that the refractory material is not easy to fall off and extending the service life of the slag outlet structure. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] In order to more clearly illustrate the embodiments of the utility model or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments recorded in the utility model. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative labor.

[0022] Figure 1 It is a structural schematic diagram of a slag outlet structure of a liquid slag discharge gasifier according to an embodiment of the utility model;

[0023] Figure 2 A schematic structural diagram of a protective layer in an embodiment of the utility model.

[0024] Reference numerals:

[0025] 1. Coil; 2. Hollow channel; 3. Protective layer; 4. Water inlet; 5. Water outlet; 6. Protective layer installation part; 7. Bending part; 8. Fixing part; 9. Connecting part; 10. Connecting plate; 11. Limiting part; 12. Support plate; 13. Refractory layer. DETAILED DESCRIPTION

[0026] Various aspects and features of the present invention are described herein with reference to the accompanying drawings.

[0027] It should be understood that various modifications may be made to the embodiments of the present application. Therefore, the above description should not be considered as limiting, but only as an example of the embodiments. Other modifications within the scope and spirit of the present utility model will occur to those skilled in the art.

[0028] The accompanying drawings, which are included in and constitute a part of the specification, illustrate embodiments of the present invention and, together with the general description of the present invention given above and the detailed description of the embodiments given below, are used to explain the principles of the present invention.

[0029] These and other characteristics of the invention will become apparent from the following description of a preferred form of embodiment given as a non-limiting example, with reference to the accompanying drawings.

[0030] It should also be understood that although the present invention has been described with reference to some specific examples, those skilled in the art will be able to realize many other equivalent forms of the present invention that have the features described in the claims and are therefore within the scope of protection defined thereby.

[0031] The above and other aspects, features and advantages of the present invention will become more apparent from the following detailed description when taken in conjunction with the accompanying drawings.

[0032] Specific embodiments of the present invention are described hereinafter with reference to the accompanying drawings; however, it should be understood that the embodiments applied for are merely examples of the present invention, which may be implemented in a variety of ways. Well-known and / or repeated functions and structures are not described in detail to avoid unnecessary or redundant details that obscure the present invention. Therefore, the specific structural and functional details applied for herein are not intended to be limiting, but merely serve as the basis and representative basis for the claims to teach those skilled in the art to use the present invention in a variety of ways with substantially any suitable detailed structure.

[0033] This specification may use the phrases "in one embodiment", "in another embodiment", "in yet another embodiment" or "in other embodiments", all of which may refer to one or more of the same or different embodiments according to the present invention.

[0034] The first embodiment of the utility model provides a slag outlet structure of a liquid slag discharge gasifier, such as Figure 1 As shown, the slag outlet structure of the liquid slag discharge gasifier includes:

[0035] The lower slag outlet body is arranged at the bottom of the combustion chamber of the gasifier, and the lower slag outlet body comprises a coil 1, and the coil 1 is wound to form a cylinder with a hollow channel 2;

[0036] The protective layer 3 is arranged on the inner wall of the cylinder near the bottom of the cylinder.

[0037] The main body of the lower slag port is arranged at the bottom of the combustion chamber of the gasifier, providing a channel for the high-temperature molten liquid slag and high-temperature raw coal gas to enter the quenching chamber for solid-liquid separation, dust removal and cooling. The main body of the lower slag port is mainly formed by the coil 1 winding to form a cylinder with a hollow channel 2, which is the channel for the liquid slag and the high-temperature raw coal gas. Cooling water is passed into the coil 1 to quickly cool down. Among them, the bottom of the cylinder is most prone to leakage. A protective layer 3 is arranged at the bottom of the cylinder to reduce the erosion of the coil 1 by the high-temperature molten liquid slag, part of the high-temperature raw coal gas and steam, thereby extending the service life of the lower slag port structure and improving safety performance.

[0038] The lower slag outlet structure includes a water inlet 4 and a water outlet 5. Cooling water flows into the coil 1 from the water inlet 4 and flows out of the coil 1 from the water outlet 5. The positions of the water inlet 4 and the water outlet 5 are arranged according to actual conditions. In order to save layout space and facilitate installation, the water inlet 4 and the water outlet 5 are installed on both sides of the cylinder respectively. In addition, the heights of the water inlet 4 and the water outlet 5 are different. The height of the water outlet 5 is higher than that of the water inlet 4, which ensures that the cooling water fully flows in the coil 1 and improves the cooling efficiency.

[0039] The coil 1 is wound to form a cylinder, and the diameter of the cylinder is different. In some embodiments, the diameter of the lower part of the cylinder is larger than the diameter of the upper part of the cylinder, and the movement speed of the high-temperature molten liquid slag and the high-temperature raw coal gas in the lower cylinder is reduced, thereby improving the gas-slag separation effect. The coil 1 at the upper part of the cylinder extends outward to form a U-shaped structure, expanding the cooling range of the lower slag opening structure for the liquid slag and the high-temperature raw coal gas.

[0040] In the prior art, the coil is made of SATP seamless steel pipe (austenitic stainless steel). After the coil leaks, welding is likely to produce welds and heat-affected zones, and the coil is prone to corrosion and cracking, making maintenance difficult. The utility model replaces the coil material from SATP (austenitic stainless steel) with chromium-molybdenum steel, such as CrMoVG, which simplifies the welding process during maintenance and is not prone to thermal cracking and stress corrosion cracking.

[0041] The high-temperature molten liquid slag and high-temperature raw coal gas diffuse in the hollow channel 2 of the cylinder, and the raw coal gas and liquid slag flowing out of the cylinder diffuse, causing part of the high-temperature raw coal gas and steam to swirl at the bottom of the lower slag outlet structure, which continuously erodes the coil 1 at the bottom of the lower slag outlet structure. The coil 1 at the bottom of the cylinder is eroded by the high-temperature molten liquid slag and high-temperature raw coal gas for a long time, which easily causes the coil 1 to leak. The bottom of the cylinder is most likely to leak. Figure 2 As shown, the bottom of the cylinder has a protective layer installation portion 6 and a bent portion 7 bent outward from the bottom of the cylinder, and the protective layer 3 is arranged on the side of the protective layer installation portion 6 and the bent portion 7 facing the center of the cylinder. The protective layer 3 reduces the erosion of the coil 1 by the high-temperature molten liquid slag, part of the high-temperature raw coal gas and steam. The protective layer 3 is a nickel-based alloy protective layer. The nickel-based alloy has good resistance to stress corrosion cracking, good resistance to pitting corrosion and crevice corrosion, good oxidation resistance and non-oxidizing hot acid performance, and has good mechanical properties at room temperature and high temperatures up to 500°C. Preferably, the protective layer 3 can be selected as a nickel-chromium-iron alloy (Incoloy alloy).

[0042] like Figure 2As shown, a plurality of fixing members 8 are installed on one side of the protective layer 3 close to the center of the cylinder, and the plurality of fixing members 8 are arranged at intervals. The fixing members 8 are preferably anchor nails. The intervals between two adjacent fixing members 8 are kept consistent. The fixing members 8 enhance the adhesion of the protective layer 3 and improve the stability of the structure. The fixing members 8 are arranged on the protective layer 3 instead of being directly installed on the coil 1, so as to ensure that the fixing members 8 do not directly contact the coil 1, and reduce the risk of crack defects in the base material of the coil 1 due to inappropriate welding current when the fixing members 8 are stud welded.

[0043] A connecting notch is provided on the side of the protective layer 3 facing the coil 1. The connecting notch is located between two adjacent coils 1. A connector 9 is installed in the connecting notch. Both ends of the connector 9 are respectively connected to two adjacent coils 1. Two adjacent coils 1 are connected by a connecting plate 10. The connecting plate 10 and the connector 9 improve the stability of the coil 1. The connector 9 can be a flexible filling piece or a rigid connecting plate. The connecting plate 10 is preferably an Inconel steel plate. When installing the protective layer 3, first weld two adjacent coils 1 through the connecting plate 10, connect the two adjacent coils 1 near the center of the cylinder at the bottom of the cylinder through the connector 9, and then embed the protective layer 3 into the bottom of the cylinder to ensure that the protective layer 3 is in close contact with the coil 1 to ensure the heat transfer effect.

[0044] A limiting portion 11 is also provided on the top of the protective layer 3, and the limiting portion 11 extends from the coil 1 toward the center of the cylinder. The limiting portion 11 can be set as a plate-like structure or a block-like structure, which is set at the bottom of the cylinder to limit the protective layer 3 and provide an installation position for the protective layer 3.

[0045] In some embodiments, the inner wall of the cylinder is further provided with an inner wall coating, and the protective layer 3 is located between the coil 1 and the inner wall coating. The inner wall coating is a high temperature resistant coating, which is arranged on the outermost side of the inner wall of the cylinder, and the protective layer 3 is only arranged near the bottom of the cylinder. The inner wall coating protects the coil 1 from being worn or damaged by the erosion of high temperature molten liquid slag and high temperature raw coal gas. The inner wall coating protects the coil, and the protective layer 3 enhances the protection of the coil 1 at the bottom of the cylinder.

[0046] A support plate 12 is installed at the lower part of the lower slag outlet body. The support plate 12 is a support component and plays a supporting role. A refractory layer 13 is arranged between the support plate 12 and the bent portion 7. The refractory layer 13 is integrally cast by a mold and a refractory material. The end of the protective layer 3 close to the refractory layer 13 is smoothly fitted with the coil 1. The end of the coil 1 has a regular shape, and the protective layer 3 is tightly installed with the coil 1 and is not easy to fall off. At the same time, it is easy to cast the refractory layer 13.

[0047] The second embodiment of the utility model provides a liquid slag discharge gasification furnace, including the above-mentioned lower slag opening structure of the liquid slag discharge gasification furnace.

[0048] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present invention.

[0049] In the description of the present invention, "first feature" or "second feature" may include one or more of the features.

[0050] In the description of the present invention, "plurality" means two or more.

[0051] In the description of the present invention, a first feature being “above” or “below” a second feature may include that the first and second features are directly in contact with each other, or may include that the first and second features are not in direct contact but are in contact with each other via another feature therebetween.

[0052] In the description of the present invention, a first feature “above”, “over” and “above” a second feature includes the first feature being directly above and obliquely above the second feature, or simply means that the first feature is horizontally higher than the second feature.

[0053] In the description of this specification, the description with reference to the terms "one embodiment", "some embodiments", "illustrative embodiments", "examples", "specific examples", or "some examples" means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the utility model. In this specification, the schematic representation of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in any one or more embodiments or examples in a suitable manner.

[0054] Although the embodiments of the present invention have been shown and described, those skilled in the art will appreciate that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the claims and their equivalents.

Claims

1. A slag outlet structure for a liquid slag discharge gasifier, characterized in that: include: A lower slag outlet body is arranged at the bottom of the combustion chamber of the gasifier, and the lower slag outlet body includes a coil, and the coil is wound to form a cylinder with a hollow channel; A protective layer is arranged on the inner wall of the cylinder near the bottom of the cylinder, the bottom of the cylinder has a bent portion bent outward from the bottom of the cylinder, a support plate is installed at the lower part of the lower slag outlet body, a refractory layer is arranged between the support plate and the bent portion, and the end of the protective layer close to the refractory layer is smoothly fitted with the coil.

2. The slag outlet structure of a liquid slag discharge gasifier according to claim 1, characterized in that: The bottom of the cylinder has a protective layer installation portion, the protective layer is arranged on the side of the protective layer installation portion and the bending portion facing the center of the cylinder, and a plurality of fixing parts are installed on the side of the protective layer close to the center of the cylinder, and the plurality of fixing parts are arranged at intervals.

3. The slag outlet structure of a liquid slag discharge gasifier according to claim 2, characterized in that: A connecting notch is provided on one side of the protective layer facing the coil, and the connecting notch is located between two adjacent coils. A connecting piece is installed in the connecting notch, and two ends of the connecting piece are respectively connected to the two adjacent coils.

4. The slag outlet structure of a liquid slag discharge gasifier according to claim 3, characterized in that: A limiting portion is also provided on the top of the protective layer, and the limiting portion is formed by extending from the coil toward the center of the cylinder.

5. The slag outlet structure of a liquid slag discharge gasifier according to claim 3, characterized in that: Two adjacent coils are also connected via a connecting plate.

6. The slag outlet structure of a liquid slag discharge gasifier according to claim 2, characterized in that: The inner wall of the cylinder is also provided with an inner wall coating, and the protective layer is located between the coil and the inner wall coating.

7. The slag outlet structure of a liquid slag discharge gasifier according to claim 1, characterized in that: It also includes a water inlet and a water outlet, which are respectively installed on both sides of the cylinder, and the water inlet and the water outlet are at different heights.

8. The slag outlet structure of a liquid slag discharge gasifier according to claim 4, characterized in that: The protective layer is a nickel-based alloy protective layer; The coil is a chrome-molybdenum steel coil.

9. A liquid slag removal gasifier, characterized in that: A lower slag outlet structure of a liquid slag discharge gasifier comprising any one of claims 1-8.

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