Gasification burner for coal water slurry gasification furnace

Abstract

The utility model relates to a gasification burner for a coal water slurry gasification furnace. Comprising a gasification burner body, a metal protective cover is arranged on the gasification burner body, the metal protective cover comprises a fixed protective part arranged on the outer circumference of the gasification burner body and an end face protective part arranged on the end face of the gasification burner body, and the fixed protective part and the end face protective part are of an integrated structure; a through hole used for gasifying materials sprayed out of the burner body is formed in the center of the end face protection part. A high-temperature-resistant metal coating is fixedly arranged on the outer circumferential surface of the fixed protection part; the gasification burner has the advantages that the gasification burner body can be effectively protected, and the service life of the gasification burner body is prolonged.

Description

Technical Field

[0001] The utility model relates to the technical field of water-coal slurry gasification furnaces, in particular to a gasification burner for water-coal slurry gasification furnaces. Background Art

[0002] The water-coal slurry gasification furnace process burner is one of the key equipment in the water-coal slurry gasification device. Its function is to fully mix the pressurized water-coal slurry with oxygen and atomize it into the gasifier combustion chamber for combustion. The flashing process has an important impact on the efficient and long-term operation of the entire gasification device. During the operation of the gasifier burner, especially when the coal type changes, the burner pressure difference fluctuates significantly, slag accumulates in the burner chamber, burner backfires, and biased spraying occur frequently and continuously, causing serious burning and cracking of the burner head, and then damaging the burner end cover and cooling water chamber, greatly shortening the service life of the gasifier burner. The average life of a normal burner is about 70 days. When the above conditions occur, the burner will show abnormal damage within less than a week of operation, increasing production costs and maintenance costs. Utility Model Content

[0003] The purpose of the utility model is to provide a gasification burner for a water-coal slurry gasification furnace to overcome the defects in the prior art.

[0004] To achieve the above purpose, the present invention provides the following technical solutions:

[0005] A gasification burner for a water-coal slurry gasification furnace includes a gasification burner body, and a metal protective cover is provided on the gasification burner body. The metal protective cover includes a fixed protective portion arranged on the outer circumference of the gasification burner body, and an end face protective portion arranged on the end face of the gasification burner body, and the fixed protective portion and the end face protective portion are an integrated structure; a through hole for spraying materials from the gasification burner body is opened at the center position of the end face protective portion; and a high-temperature resistant metal coating is fixedly provided on the outer circumferential surface of the fixed protective portion.

[0006] The beneficial effects of the present invention are as follows: in the traditional technology, cooling water is mainly used for heat insulation of the head of the gasification burner and protection of the outside of the gasification burner body; while the gasification furnace is a high-temperature oxygen-rich environment, and the metal coil outside the cooling water is directly exposed and easily oxidized in this environment, thus failing to play a protective role; the present invention provides an integrated metal protective cover, which not only can achieve hard protection for the inside of the gasification burner body and isolate part of the heat, but also can provide support for the setting of the high-temperature resistant metal coating; further, the high-temperature resistant metal coating can isolate most of the heat to protect the gasification burner body, and at the same time can avoid oxidation caused by the direct exposure of the metal protective cover in a high-temperature oxygen-rich environment; thereby achieving the characteristics of effectively protecting the gasification burner and improving its service life.

[0007] Preferably, the gasification burner body includes a central epoxy pipe arranged at a central position, a coal slurry channel is provided outside the central epoxy pipe, an outer epoxy pipe is provided outside the coal slurry channel, and a cooling water jacket is provided outside the outer epoxy pipe.

[0008] Preferably, a heat-insulating material layer is provided on the outer circumference of the gasification burner body and between the fixed protective portion.

[0009] Preferably, a high temperature resistant rubber layer is provided between the end face of the gasification burner body and the end face protection portion.

[0010] Preferably, the fixed protective portion is provided with a plurality of grooves.

[0011] Preferably, the grooves are waist-shaped holes, which are evenly distributed on the outer surface of the fixed protective part.

[0012] Preferably, a metal reinforcing wire mesh is provided inside the high temperature resistant metal coating.

[0013] A gasification burner for a water-coal slurry gasification furnace manufactured according to the above scheme protects the gasification burner body by providing a metal protective cover and a high-temperature resistant metal coating. Specifically, the metal protective cover can achieve hard protection for the gasification burner body and isolate part of the heat, while providing support for the high-temperature resistant metal coating. The high-temperature resistant metal coating can isolate most of the heat and prevent the metal protective cover from being directly exposed and oxidized in a high-temperature oxygen-rich environment. In addition, the metal protective cover described in the present invention also includes an end face protection portion, especially its combination with the high-temperature resistant adhesive layer can prevent the material from being deformed due to the high-temperature oxygen-rich environment. At the same time, it can also achieve separation between the end face protection portion and the end face of the gasification burner body, and prevent the flame high-temperature gas from entering between the end face protection portion and the end face of the gasification burner body, which has the characteristic of protecting the gasification burner body. In the present invention, by providing a groove, the metal protective cover and the metal protective cover can be firmly fixed without the help of external components. It has the characteristics of low cost, simple structure and good firmness, laying a foundation for achieving the gasification burner body. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 It is a structural diagram of the present utility model.

[0015] Figure 2 This is a schematic structural diagram of the metal protective cover of the present utility model.

[0016] In the figure: 1. Metal protective cover; 2. Through hole; 3. High-temperature resistant metal coating; 4. Central epoxy pipe; 5. Coal slurry channel; 6. Outer epoxy pipe; 7. Cooling water jacket; 8. Insulation material layer; 9. High-temperature resistant adhesive layer; 10. Groove; 11. Metal reinforcing wire mesh. DETAILED DESCRIPTION

[0017] The technical solutions in the embodiments of the present invention will be described clearly and completely below with reference to the accompanying drawings in the embodiments of the present invention.

[0018] Reference Figure 1-2 As shown, the utility model is a gasification burner for a water-coal slurry gasification furnace, comprising a gasification burner body, on which a metal protective cover 1 is provided, wherein the metal protective cover 1 comprises a fixed protective portion arranged on the outer circumference of the gasification burner body, and an end face protective portion arranged on the end face of the gasification burner body, wherein the fixed protective portion and the end face protective portion are an integrated structure; a through hole 2 for ejecting materials from the gasification burner body is provided at the center position of the end face protective portion; a high-temperature resistant metal coating 3 is fixedly provided on the outer circumferential surface of the fixed protective portion. The gasification burner body in the present invention can be a traditional gasification burner. The traditional gasification burner is provided with a metal heat exchange coil (cooling water heat exchange coil) on the outside. The stress, deformation, and uneven thinning of the metal heat exchange coil during bending manufacturing make it easy to deform in a high-temperature environment, which directly causes uneven cooling water flow and fails to achieve the preset heat exchange cooling effect. In severe cases, it causes technical problems such as the coil burning through. The present invention provides a fixed protective part in the metal protective cover 1 to achieve hard protection of the outside of the metal heat exchange coil and isolate part of the heat; further, by providing a high-temperature resistant metal coating 3, most of the heat can be isolated, and the metal protective cover can be prevented from being directly exposed and oxidized in a high-temperature oxygen-rich environment; the material of the metal protective cover 1 described in the present invention is Nb-10Hf.

[0019] Furthermore, the gasification burner body includes a central epoxy pipe 4 disposed at the center, a coal slurry channel 5 disposed on the outside of the central epoxy pipe 4, an outer epoxy pipe 6 disposed on the outside of the coal slurry channel 5, and a cooling water jacket 7 disposed on the outside of the outer epoxy pipe 6. The cooling water jacket 7 described in the present invention is disposed at the outermost portion of the gasification burner body to protect the interior of the gasification burner body through heat exchange. Furthermore, the cooling water jacket 7 described in the present invention is not a coil structure, so as to achieve the goal of thinning the outer oxygen end face while ensuring overall strength, thereby enhancing heat exchange and reducing end face cracking caused by uneven heat exchange.

[0020] Furthermore, a thermal insulation layer 8 is provided on the outer circumference of the gasification burner body and between the fixed protective portion. The thermal insulation layer 8 described in the present invention is disposed between the metal protective cover 1 and the outer wall of the gasification burner body. Its primary function is to isolate heat and ensure the smooth operation of the burner. At the same time, it prevents the metal material from directly contacting and deforming after stretching in a high-temperature environment, which could affect the normal operation of the gasification burner body. The thermal insulation layer 8 described in the present invention is made of Cr-Ti-Si and Cr-Fe-Si anti-oxidation coatings, which are commercially available and therefore will not be described in detail.

[0021] Furthermore, a high-temperature resistant adhesive layer 9 is provided between the end face of the gasification burner body and the end face protection portion. The high-temperature resistant adhesive layer 9 described in the present invention is provided between the end face of the gasification burner body and the end face protection portion, and serves to connect the end face of the gasification burner body and the end face protection portion, thereby preventing the end face of the gasification burner body from being separated during operation. Furthermore, the high-temperature resistant adhesive layer 9 can fill the gap between the end face of the gasification burner body and the end face protection portion to prevent the high-temperature gas and flame from entering and causing deformation of the end face of the gasification burner body. The above-mentioned arrangement can extend the service life of the end face of the gasification burner body, delay oxidation of the nozzle end at high temperature, and especially when the sulfur content in the coal causes high-temperature sulfidation corrosion on the metal surface, it can delay the generation of radial cracks. The high-temperature resistant adhesive layer 9 described in the present invention is made of ZS-1071 adhesive, which can be purchased directly on the market, so it will not be described in detail.

[0022] Furthermore, the fixed protective portion is provided with a plurality of grooves 10. The material of the outer part of the gasification burner body is metal, and the material of the metal protective cover 1 described in the present invention is a high-temperature resistant material. The conventional prescribed method is to connect it by means of snap fasteners, etc., but since the present invention needs to be installed inside the gasification furnace, the installation space is limited (i.e., it is inconvenient to install it inside the gasification furnace after the fixed equipment is installed); in the actual installation process, the present invention uses the metal material of the outer part of the gasification burner body as the base material to perform surfacing welding in the groove (forming a welding bump that matches the groove), thereby achieving a firm fixation of the metal protective cover 1 and the gasification burner body of different materials, while ensuring the stability of the structure and facilitating subsequent installation; the grooves 10 described in the present invention are several and can be evenly distributed or unevenly distributed; the shape of the grooves 10 can be one of a triangle, a rectangle, a square, a prism, a dovetail, a circle or an ellipse; the grooves 10 are penetrating grooves.

[0023] Furthermore, the grooves 10 are waist-shaped holes, which are evenly distributed on the outer surface of the fixed protective part.

[0024] Furthermore, a metal reinforcing mesh 11 is provided within the high-temperature-resistant metal coating 3. The present invention ensures the stability of the coating by providing the metal reinforcing mesh 11 within the high-temperature-resistant metal coating 3. The high-temperature-resistant metal coating 3 described in the present invention can be made of refractory cement. In actual use, the refractory cement is cast and formed, and in combination with the metal reinforcing mesh 11, it achieves both high-temperature resistance and structural stability.

[0025] Working principle of the present invention: When preparing the present invention, a structure is adopted in which a coal slurry channel 5 is provided on the outside of the central epoxy pipe 4, an outer epoxy pipe 6 is provided on the outside of the coal slurry channel 5, and a cooling water jacket 7 is provided on the outside of the outer epoxy pipe 6. A heat-insulating material layer 8 is provided between the outer wall of the cooling water jacket 7 and the metal protective cover 1. The surface of the gasification burner body is welded at the position where the groove 10 is provided on the metal protective cover 1, and a welding protrusion is formed and clamped in the groove 10, so that the metal protective cover 1 and the gasification burner body form a firm and stable structure. A high-temperature resistant adhesive layer 9 is provided between the end face of the gasification burner body and the end face protection part; after the above preparation, refractory cement is made into a castable, a metal reinforcing wire mesh 11 is provided on the outer surface of the fixed protection part of the metal protective cover 1, and the castable is poured on the outer surface of the fixed protection part of the metal protective cover 1. The gasification burner for the water-coal slurry gasification furnace using the above-mentioned structure can operate normally for 210 days.

[0026] Although the embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and variations may be made to these embodiments without departing from the principles and spirit of the present invention, and the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A gasification burner for a water-coal slurry gasifier, comprising a gasification burner body, characterized in that: The gasification burner body is provided with a metal protective cover (1). The metal protective cover (1) comprises a fixed protective portion arranged on the outer circumference of the gasification burner body, and an end face protective portion arranged on the end face of the gasification burner body, wherein the fixed protective portion and the end face protective portion are an integrated structure; A through hole (2) for ejecting materials from the gasification burner body is provided at the center of the end face protection portion; and a high-temperature resistant metal coating (3) is fixedly provided on the outer circumferential surface of the fixed protection portion.

2. The gasification burner for a water-coal slurry gasifier according to claim 1, characterized in that: The gasification burner body comprises a central epoxy pipe (4) arranged at a central position, a coal slurry channel (5) is provided on the outside of the central epoxy pipe (4), an outer epoxy pipe (6) is provided on the outside of the coal slurry channel (5), and a cooling water jacket (7) is provided on the outside of the outer epoxy pipe (6).

3. The gasification burner for a water-coal slurry gasifier according to claim 1, characterized in that: A heat-insulating material layer (8) is provided on the outer circumference of the gasification burner body and between the fixed protection portion.

4. The gasification burner for a water-coal slurry gasifier according to claim 1, characterized in that: A high-temperature resistant rubber layer (9) is provided between the end face of the gasification burner body and the end face protection portion.

5. A gasification burner for a water-coal slurry gasifier according to any one of claims 1 to 4, characterized in that: The fixed protection portion is provided with a plurality of grooves (10).

6. The gasification burner for a water-coal slurry gasifier according to claim 5, characterized in that: The grooves (10) are waist-shaped holes, which are evenly distributed on the outer surface of the fixed protective part.

7. The gasification burner for a water-coal slurry gasifier according to claim 5, characterized in that: A metal reinforcing wire mesh (11) is provided inside the high-temperature resistant metal coating (3).

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