High-temperature-resistant flue

Abstract

The utility model discloses a high-temperature-resistant flue which comprises a steel flue pipe, aluminum silicate heat preservation cotton is arranged on the inner wall of the steel flue pipe, a wear-resistant steel layer is arranged on the inner wall of the aluminum silicate heat preservation cotton, the steel flue pipe is connected with an air mixer, the air mixer sends cold air into the wear-resistant steel layer, and an inner compensator is connected into the wear-resistant steel layer. The steel flue pipe is protected through the wear-resistant steel layer and the aluminum silicate heat preservation cotton, heat is prevented from being directly transmitted to the steel flue pipe, washing of particulate matter is effectively isolated, the service life of the high-temperature flue is prolonged, the maintenance frequency is reduced, the production and operation cost is reduced, double compensation is achieved through the outer compensator and the inner compensator, the problem of insufficient compensation is solved, and the service life of the high-temperature flue is prolonged. The requirement for the strength of an inner compensator is low, dust is leaked in a high-temperature flue occasionally, the dust leakage situation caused by pipeline pull cracks is avoided, the conveying amount of cold air and the cold air distribution proportion are controlled through an air mixing valve, and it is ensured that smoke enters a mechanical cooler within a controllable range.

Description

TECHNICAL FIELD

[0001] The utility model relates to high temperature flue technical field, concretely is a kind of high temperature flue. BACKGROUND

[0002] The main facility of AOD furnace smelting of steel plant, a large amount of high-temperature flue gas is generated in smelting process, the temperature can be as high as 700-1000 degrees Celsius, different smelting process links, the temperature generated by smelting is different, high-temperature flue gas will first pass through waste heat boiler and then to ordinary flue, after passing through waste heat boiler, flue gas temperature can be reduced to 200-500 degrees Celsius interval, after cooling, flue gas passes through ordinary steel flue and enters mechanical cooler, and finally reaches dust removal system, and after filtration, it is discharged into the atmosphere.

[0003] In daily production, the series problems such as cracking, welding, smoke leakage, ash leakage and the like generated by ordinary steel flue are difficult points for equipment maintenance, and the shortcomings of ordinary steel flue are analyzed as follows:

[0004] 1. Q235 material steel flue has poor high-temperature resistance and erosion resistance.

[0005] 2. Ordinary steel flue has poor heat expansion and cold shrinkage resistance, and is prone to a series of problems such as welding, cracking and deformation.

[0006] 3. AOD furnace smelting process determines that the temperature of flue gas is high or low, and there are many particulates in flue gas, ordinary steel flue has poor erosion resistance, especially at 90-degree elbow.

[0007] 4. Mechanical cooler has limited cooling capacity, and bag dust removal has high pressure, and bag burning and the like occur. INVENTION CONTENTS

[0008] The utility model aims at providing a high-temperature resistant flue to solve the problems in the above background technology.

[0009] To achieve the above-mentioned purpose, the utility model provides the following technical scheme: a high-temperature resistant flue, comprising a steel flue pipe, the inner wall of the steel flue pipe is provided with aluminum silicate insulation cotton, the inner wall of the aluminum silicate insulation cotton is provided with a wear-resistant steel layer, the wear-resistant steel layer has better anti-particle erosion effect, and the high-temperature flue is more durable.

[0010] The steel flue pipe is connected with a wind mixer, the wind mixer sends cold air to the inside of the wear-resistant steel layer to control the delayed temperature, the inside of the wear-resistant steel layer is connected with an internal compensator surface, which has a compensation effect and can also prevent ash leakage, and ensures that ash is inside the high-temperature flue.

[0011] Further, a plurality of anchor hooks are welded on the inner wall of the steel flue pipe, the anchor hooks are used for fixing the aluminum silicate insulation cotton, and the fixing effect of the aluminum silicate insulation cotton is improved.

[0012] Further, the two-section steel flue pipe is connected with an outer compensator, which cooperates with the inner compensator to achieve better compensation effect and prevent the high-temperature flue from being damaged.

[0013] Further, the air mixer comprises an adapter pipe fixedly connected with the steel flue pipe, and the adapter pipe is connected with an air mixing valve.

[0014] Compared with the prior art, the steel flue pipe and the air mixer have the following beneficial effects:

[0015] (1) The steel flue pipe is protected by the wear-resistant steel layer and the aluminum silicate insulation cotton, so that the heat is not directly transmitted to the steel flue pipe, the erosion of particulate matters is isolated, the service life of the high-temperature flue is increased, the maintenance frequency is reduced, and the production operation cost is reduced.

[0016] (2) The double compensation is realized by the outer compensator and the inner compensator, the problem of insufficient compensation is solved, the strength requirement of the inner compensator is relatively low, and in case of occasional ash leakage, the leakage is in the high-temperature flue, so that the dust leakage caused by pipe cracking is avoided.

[0017] (3) The air mixing valve controls the delivery amount of the cold air, the valve core opening degree is adjusted according to different production process stages, the cold air proportion is controlled, and the flue gas is ensured to enter the forced cooler within a controllable range. BRIEF DESCRIPTION OF DRAWINGS

[0018] Figure 1 Fig. 2 is a structural schematic view of the connection between the steel flue pipe and the air mixing valve of the utility model;

[0019] Figure 2 Fig. 3 is a structural schematic view of the connection between the steel flue pipe, the outer compensator and the inner compensator of the utility model;

[0020] Figure 3 Fig. 4 is a sectional view of the steel flue pipe of the utility model.

[0021] In the figure: 1, steel flue pipe; 2, adapter pipe; 3, air mixing valve; 4, outer compensator; 5, sealing ring; 6, inner compensator; 7, anchor hook; 8, aluminum silicate insulation cotton; 9, wear-resistant steel layer. DETAILED DESCRIPTION

[0022] The technical solutions in the embodiments of the utility model will be clearly and completely described below with reference to the drawings in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, rather than all the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by those skilled in the art without creative labor fall within the protection scope of the utility model.

[0023] Embodiment:

[0024] Please refer to Figures 1-3 The utility model provides a technical scheme: a kind of high temperature flue, including steel flue pipe 1, the inner wall of steel flue pipe 1 is equipped with aluminium silicate insulation cotton 8, the inner wall of aluminium silicate insulation cotton 8 is equipped with wear-resistant steel layer 9, steel flue pipe 1 thickness includes but is not limited to 6mm, the thickness of aluminium silicate insulation cotton 8 includes but is not limited to 290mm, the thickness of wear-resistant steel layer 9 includes but is not limited to 3mm;

[0025] The steel flue pipe 1 is connected with air mixer, the air mixer sends cold air to the inside of wear-resistant steel layer 9, the inside of wear-resistant steel layer 9 is connected with inner compensator 6, the size of inner compensator 6 is less than wear-resistant steel layer 9, ensure that inner compensator 6 has certain activity space, for high temperature flue stable compensation, inner compensator 6 is bellows, can be manufactured according to needs with different materials, such as stainless steel, alloy steel etc., ensure that inner compensator 6 has good elasticity and stretchability, solve the thermal expansion problem of steel flue pipe 1.

[0026] In the embodiment, as shown in Figure 3 A plurality of anchor hooks 7 are welded on the inner wall of the steel flue pipe 1, the anchor hooks 7 are used to fix the aluminium silicate insulation cotton 8, and the anchor hooks 7 are mainly used to firmly fix the aluminium silicate insulation cotton 8 on the inner wall of the steel flue pipe 1. By the anchor hooks 7 welded on the inner wall of the flue pipe, the heat insulation material can be effectively prevented from falling off or sliding, so as to ensure the stability and heat insulation effect of the heat insulation layer, and the anchor hooks 7 also support the wear-resistant steel layer 9, so that the wear-resistant steel layer 9 cannot move.

[0027] In the embodiment, as shown in Figure 2 An outer compensator 4 is connected between the two steel flue pipes 1, and the outer compensator 4 can absorb the thermal expansion and contraction of the high temperature flue due to temperature change, prevent the high temperature flue from being broken or leaking due to excessive deformation, and thus maintain the sealing and integrity of the high temperature flue.

[0028] In the embodiment, as shown in Figure 2 The inner compensator 6 is connected with a sealing ring 5 at both ends, and the sealing ring 5 is fixedly connected with the wear-resistant steel layer 9. The sealing ring 5 mainly plays a sealing role, ensures the sealing and integrity of the wear-resistant steel layer 9 and the inner compensator 6, and enhances the stability and durability of the sealing.

[0029] In the embodiment, as shown in Figure 1 The air mixer includes an adapter pipe 2, the adapter pipe 2 is fixedly connected with the steel flue pipe 1, and the adapter pipe 2 is connected with an air mixing valve 3. The adapter pipe 2 is inclinedly connected with the steel flue pipe 1, better guides the air to flow into the high temperature flue, and the air mixing valve 3 is electrically controlled.

[0030] Specifically, when the flue gas flows in the wear-resistant steel layer 9, the wear-resistant steel layer 9 is not easy to be damaged by the particulate matter, the aluminum silicate insulation cotton 8 can play a heat insulation role on the steel flue pipe 1, and the steel flue pipe 1 is not easy to be damaged, the high-temperature flue is not easy to produce a series of problems such as cracking, welding, smoke leakage, ash leakage and the like, the inner compensator 6 first plays a compensation role on the high-temperature flue, then the outer compensator 4 plays a compensation role on the high-temperature flue, when the inner compensator 6 is damaged, the ash leakage problem can also be prevented, the outer compensator 4 is composed of a corrugated pipe, a flange and a sealing element, the flange is used for connecting the outer compensator 4 and the steel flue pipe 1, and the sealing element plays a sealing and leakage-proof role;

[0031] The electrically-driven air mixing valve 3 can be reasonably selected according to the design parameters such as air volume, air speed and negative pressure, and the opening degree is controlled in linkage with the production process, so that the use is flexible and convenient, and the flue gas is ensured to enter the mechanical cooler within a controllable range.

[0032] Although the embodiments of the utility model have been shown and described, it can be understood by those skilled in the art that various changes, modifications, replacements and variations can be made to the embodiments without departing from the principles and spirits of the utility model, and the scope of the utility model is defined by the appended claims and their equivalents.

Claims

1. A high temperature resistant flue comprising a steel flue pipe (1), characterized in that: The inner wall of the steel flue pipe (1) is provided with aluminum silicate thermal cotton (8), and the inner wall of the aluminum silicate thermal cotton (8) is provided with a wear-resistant steel layer (9). The steel flue pipe (1) is connected with a wind mixer, the wind mixer sends cold wind to the inside of the wear-resistant steel layer (9), and the inside of the wear-resistant steel layer (9) is connected with an internal compensator (6).

2. A high temperature flue as claimed in claim 1, wherein: The inner wall of the steel flue pipe (1) is welded with a plurality of anchor hooks (7), and the anchor hooks (7) are used for fixing the aluminum silicate thermal cotton (8).

3. A high temperature flue as claimed in claim 1, wherein: An external compensator (4) is connected between the two steel flue pipes (1).

4. A high temperature flue as claimed in claim 1, wherein: The internal compensator (6) is connected with a sealing ring (5) at both ends, and the sealing ring (5) is fixedly connected with the wear-resistant steel layer (9).

5. A high temperature flue as claimed in claim 1, wherein: The wind mixer comprises an adapter pipe (2), the adapter pipe (2) is fixedly connected with the steel flue pipe (1), and the adapter pipe (2) is connected with a wind mixer valve (3).

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