High-efficiency energy-saving tuyere small sleeve with composite protective layer on outer surface for blast furnace

Abstract

The utility model discloses an efficient energy-saving tuyere small sleeve with a composite protective layer on the outer surface for a blast furnace, and particularly relates to the technical field of blast furnace smelting equipment, which comprises a tuyere small sleeve body, and a plurality of lining ceramic composite pipes are arranged on the outer surface of the tuyere small sleeve body. The plurality of lining ceramic composite pipes are annularly and uniformly distributed on the outer surface of the tuyere small sleeve body; the lining ceramic composite pipe comprises a heat-resisting stainless steel outer wall layer, and a lining ceramic inner wall layer is arranged in the heat-resisting stainless steel outer wall layer. The lining ceramic composite pipe is arranged and covers most of the outer surface, extending into the blast furnace, of the tuyere small sleeve body, and the inner surface of the small sleeve almost covers the lining ceramic composite pipe, so that heat taken away by cooling water is reduced to the maximum extent, the water inlet and outlet temperature difference of the small sleeve is greatly reduced, and the service life of the tuyere small sleeve is prolonged. And moreover, the hot air temperature is increased in a disguised manner, the pulverized coal combustion is facilitated, a great amount of production consumption is saved for the blast furnace, and very considerable economic benefits are brought.

Description

TECHNICAL FIELD

[0001] The utility model relates to blast furnace smelting equipment technical field more specifically, the utility model relates to a kind of high-efficiency energy-saving tuyere small sleeve with composite protective layer for blast furnace. BACKGROUND

[0002] Blast furnace tuyere small sleeve is the core component connecting hot blast ring pipe and blast furnace hearth, and bears the important function of conveying high-temperature hot blast, injecting fuel and maintaining the balance of combustion in the furnace. Its working environment is extremely harsh, and it has to withstand high temperature above 2000℃, high-speed coal gas flow impact, slag erosion and frequent thermal stress changes for a long time. Surface damage is the main reason for the failure of tuyere small sleeve, which directly affects the production efficiency and economy of blast furnace. Therefore, it is of great significance to study the damage mechanism and propose effective protection measures for the efficient operation of blast furnace. At present, traditional tuyere small sleeve is mostly made of copper alloy, which has the following problems:

[0003] 1. High-temperature oxidation: Some areas of tuyere small sleeve are exposed to high-temperature areas of blast furnace (about 2000℃) for a long time. The metal surface is easy to react with oxygen to form an oxide layer, causing the surface of the material to appear oxide skin, spalling or thinning.

[0004] 2. Iron drops from the upper part or iron spatter from the lower part fall on the outer surface of tuyere small sleeve, instantly generating extremely high temperature heat flow so that the copper tuyere wall quickly melts and causes melting loss.

[0005] 3. Chemical erosion: Chemical substances (such as sulfur, alkali metals, zinc, etc.) in the furnace gas and slag react with the material of tuyere small sleeve, forming low-melting-point compounds or brittle phases, accelerating corrosion, and forming honeycomb-shaped corrosion pits or intergranular cracks on the surface.

[0006] 4. Mechanical wear: The impact and friction of furnace charge and gas flow on the surface of tuyere small sleeve cause surface scratches and pits.

[0007] 5. Thermal fatigue failure: Frequent temperature changes cause thermal stress, leading to cracks and spalling, and shortening the service life.

[0008] In the prior art, some tuyere small sleeves are coated with a coating (such as ceramic coating) to improve high-temperature resistance, corrosion resistance and wear resistance, but the coating is easy to spall.

[0009] Therefore, there is an urgent need for a high-efficiency energy-saving tuyere small sleeve with composite protective layer for blast furnace to solve the above problems. UTILITY MODEL CONTENTS

[0010] In order to overcome the above-mentioned defects of the prior art, the embodiment of the utility model provides a blast furnace high -efficient energy -conserving tuyere small cover with composite protective layer on the outer surface, through being equipped with lining ceramic composite pipe, lining ceramic composite pipe covers most of the outer surface of tuyere small cover body that extends into blast furnace, plus small cover inner surface also almost all covers lining ceramic composite pipe, will reduce the heat that cooling water takes away to the maximum extent, greatly reduces small cover water temperature difference of going in and out, and also improves hot air temperature indirectly, is favorable to coal powder combustion, saves great production consumption for blast furnace, brings very considerable economic benefits, to solve the problem that the prior art proposes.

[0011] In order to achieve the above object, the utility model provides the following technical scheme: a blast furnace high -efficient energy -conserving tuyere small cover with composite protective layer on the outer surface, including tuyere small cover body, the outer surface of tuyere small cover body is provided with a plurality of lining ceramic composite pipes, a plurality of lining ceramic composite pipes are evenly distributed on the outer surface of tuyere small cover body in ring shape;

[0012] The lining ceramic composite pipe includes a heat-resistant stainless steel outer wall layer, and the heat-resistant stainless steel outer wall layer is provided with a lining ceramic inner wall layer in the pipe.

[0013] In a preferred embodiment, the heat-resistant stainless steel outer wall layer is welded to the tuyere small cover body.

[0014] In a preferred embodiment, the lining ceramic inner wall layer is tightly clamped by the outer wall under the compressive stress of the heat-resistant stainless steel outer wall layer.

[0015] The utility model discloses technical effect and advantage:

[0016] The utility model discloses through being equipped with lining ceramic composite pipe, lining ceramic composite pipe covers most of the outer surface of tuyere small cover body that extends into blast furnace, plus small cover inner surface also almost all covers lining ceramic composite pipe, will reduce the heat that cooling water takes away to the maximum extent, greatly reduces small cover water temperature difference of going in and out, and also improves hot air temperature indirectly, is favorable to coal powder combustion, saves great production consumption for blast furnace, brings very considerable economic benefits. DRAWINGS DESCRIPTION

[0017] Fig. 1 It is the whole structure schematic view of the utility model.

[0018] Fig. 2 It is the structure schematic view of the utility model.

[0019] The drawing mark is: 1, tuyere small cover body;2, lining ceramic composite pipe;3, heat-resistant stainless steel outer wall layer;4, lining ceramic inner wall layer. SPECIFIC IMPLEMENTATION

[0020] Clearly and completely describe the technical scheme in the embodiments of the utility model with reference to the drawings in the embodiments of the utility model, obviously, the described embodiments are only a part of the embodiments of the utility model, not all the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by the person skilled in the art without creative labor belong to the scope of the utility model protection.

[0021] As shown in the accompanying Figs. 1-2 The utility model provides a high -efficient energy -conserving tuyere small cover with composite protection layer of outer surface for blast furnace, including tuyere small cover body 1, the inner lining ceramic composite pipe 2 is uniformly distributed to the outer surface of tuyere small cover body 1 in multiple and is provided with multiple inner lining ceramic composite pipe 2 on the outer surface of tuyere small cover body 1,

[0022] The inner lining ceramic composite pipe 2 includes heat -resistant stainless steel outer wall layer 3, and the inner lining ceramic inner wall layer 4 is arranged in the pipe of heat -resistant stainless steel outer wall layer 3.

[0023] The heat -resistant stainless steel outer wall layer 3 is welded with tuyere small cover body 1.

[0024] The inner lining ceramic inner wall layer 4 is tightly clamped by the outer wall under the compression stress of heat -resistant stainless steel outer wall layer 3.

[0025] The specific implementation of the embodiment is: when using the utility model, whether it is heat -resistant steel or ceramic, the thermal conductivity is far less than copper, especially ceramic, only 1 / 72 of copper, so the ceramic composite pipe has good energy -saving function, and the larger the area covered by the ceramic composite pipe, the greater the energy -saving benefit, the inner lining ceramic composite pipe 2 of the utility model covers most of the outer surface of tuyere small cover body 1 inserted into the blast furnace, and the inner surface of the small cover is also almost entirely covered with the inner lining ceramic composite pipe 2, which will greatly reduce the heat carried away by the cooling water, greatly reduce the water temperature difference of the small cover, and also increase the hot air temperature, which is beneficial to the combustion of pulverized coal, saves a lot of production consumption for the blast furnace, and brings very considerable economic benefits.

[0026] The utility model working principle is:

[0027] Referring to the drawings in the description Figs. 1-2 When using the utility model, the inner lining ceramic composite pipe 2 is provided, the inner lining ceramic composite pipe 2 covers most of the outer surface of tuyere small cover body 1 inserted into the blast furnace, and the inner surface of the small cover is also almost entirely covered with the inner lining ceramic composite pipe 2, which will greatly reduce the heat carried away by the cooling water, greatly reduce the water temperature difference of the small cover, and also increase the hot air temperature, which is beneficial to the combustion of pulverized coal, saves a lot of production consumption for the blast furnace, and brings very considerable economic benefits.

[0028] Finally should be explained a few points is: first, in the description of the present application, it should be pointed out that, unless otherwise specified and limited, the term "installation", "connected", "connection" should be broad, can be mechanical or electrical connection, but also can be two elements inside the communication, can be directly connected, "up", "down", "left", "right" and so on, only for indicating the relative position relationship, when the absolute position of the described object changes, the relative position relationship may change;

[0029] Second: the utility model discloses the embodiment in the drawing, only relate to the structure involved in the embodiment of the present disclosure, other structures can refer to the usual design, under the condition of not conflicting, the same embodiment and different embodiments of the utility model can be combined with each other;

[0030] Finally: the above only for the preferred embodiment of the utility model has, and does not for limiting the utility model, any modification, equivalent replacement, improvement etc. that is made within the spirit and principle of the utility model, should be included in the protection scope of the utility model.

Claims

1. A high-efficiency energy-saving tuyere small sleeve for blast furnaces with a composite protective layer on the outer surface, comprising a tuyere small sleeve body (1), characterized in that: The outer surface of the tuyere small sleeve body (1) is provided with a plurality of lining ceramic composite pipes (2), and the plurality of lining ceramic composite pipes (2) are annularly and uniformly distributed on the outer surface of the tuyere small sleeve body (1). The lining ceramic composite pipe (2) comprises a heat-resistant stainless steel outer wall layer (3), and the heat-resistant stainless steel outer wall layer (3) is provided with a lining ceramic inner wall layer (4) in the pipe.

2. The blast furnace high-efficiency energy-saving tuyere small sleeve with a composite protective layer on the outer surface according to claim 1, characterized in that: The heat-resistant stainless steel outer wall layer (3) is welded with the tuyere small sleeve body (1).

3. The blast furnace high-efficiency energy-saving tuyere small sleeve with a composite protective layer on the outer surface according to claim 1, characterized in that: The lining ceramic inner wall layer (4) is tightly clamped by the outer wall under the compression stress of the heat-resistant stainless steel outer wall layer (3).

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