CN216614727U

CN216614727U - Double-layer furnace shell without cooling wall

Info

Publication number: CN216614727U
Application number: CN202220067816.6U
Authority: CN
Inventors: 赵奇强; 王磊; 孙华平; 陈涛; 赵国磊
Original assignee: Huatian Engineering and Technology Corp MCC
Current assignee: Huatian Engineering and Technology Corp MCC
Priority date: 2022-01-12
Filing date: 2022-01-12
Publication date: 2022-05-27
Anticipated expiration: 2032-01-12

Abstract

The utility model discloses a double-layer furnace shell without a cooling wall, relates to the technical field of a cooling structure of a blast furnace, and aims to solve the problems of low heat transfer efficiency, complex design structure, difficult installation and large investment of a hearth cooling wall; the utility model is arranged at the periphery of a blast furnace hearth carbon brick and comprises an inner furnace shell and an outer furnace shell which are fixedly connected through a plurality of fixing pieces; a plurality of water-cooling pipes are laid between the inner furnace shell and the outer furnace shell, and heat-conducting refractory materials are filled outside the water-cooling pipes; two ends of each water-cooled tube are respectively arranged at the outer sides of the upper end and the lower end of the double-layer furnace shell, one side of the inner furnace shell far away from the hearth is welded with a plurality of groups of water tube positioning devices, and each group is provided with at least four positioning blocks which respectively abut against two sides of the upper part and the lower part of the same water-cooled tube; the utility model has the advantages of simple and reasonable structure, low cost, convenient and quick installation and good cooling effect.

Description

Double-layer furnace shell without cooling wall

Technical Field

The utility model relates to the technical field of blast furnace cooling structures, in particular to a double-layer furnace shell without a cooling wall.

Background

The cooling structure of the traditional blast furnace hearth is the same as the cooling structure of the traditional blast furnace hearth, and the cooling structure from the inside of the furnace to the outside of the furnace is respectively as follows: in the specification of the utility model patent with the publication number of CN1067105C, the stave of name blast furnace side wall and manufacturing and application method, the structure of general stave is just disclosed to charcoal brick, carbon pounding material layer, stave wall body, clearance layer and water pipe between wall body and the water pipe: carbon fire-bricks are layered inside the blast furnace. And a stamping refractory material, a cooling wall and a pouring refractory material are arranged between the carbon refractory brick layer and the furnace shell. Refractory bricks are stacked on the hearth bottom of the blast furnace, and cooling pipes are also provided on the hearth bottom to cool the hearth side wall of the blast furnace through a stave.

The cooling wall plays a central role in heat conduction in the cooling structure of the blast furnace hearth. The high-efficiency work of the cooling wall can not be avoided in the safe production of the blast furnace, the high efficiency of the cooling wall is kept, the cooling wall has strong cooling capacity, the base metal of the cooling wall has good mechanical property, and the internal structure of the cooling wall is reasonable.

At present, the cooling wall used at the hearth part is mainly a cast iron cooling wall, and the cast iron cooling wall has the following defects: 1) an air gap layer and an anti-seepage carbon layer are arranged between a cast iron base material and an internal cooling water pipe, so that heat cannot be conducted out, huge thermal resistance exists in the cast iron base material, the physical performance of a wall body of a cast part is poor, and although the cast iron base material is also improved by related exploration, for example, a utility model patent with the publication number of CN101634523B and the name of a casting method of a cast steel cooling wall is provided, but the common manufacturing process is complex; 2) the carbon pounding material layer between the cooling wall and the carbon brick also has great influence on the whole heat conducting system; 3) the cooling walls are required to be arranged in blocks in the furnace, and a cooling blind area about 200mm is formed at the joint of the two cooling walls; 4) a furnace shell is provided with a plurality of holes for water inlet and outlet of the cooling wall, so that the strength and the sealing property of the furnace shell are weakened, and the positions of the holes are inconvenient to arrange; the utility model with the publication number CN104236313B, entitled transverse staggered arrangement method of cooling walls of iron making furnace, discloses the existing block arrangement and the improved block arrangement, wherein the problems in 3) and 4) above also exist. Therefore, there is a need for a stave-free double shell to solve these problems.

SUMMERY OF THE UTILITY MODEL

The utility model aims to provide a double-layer furnace shell without a cooling wall, which aims to solve the problems of low heat transfer efficiency, complex design structure, difficult installation and large investment of the cooling wall of a furnace hearth.

In order to achieve the purpose, the utility model provides the following technical scheme: a double-layer furnace shell without a cooling wall is arranged at the periphery of a carbon brick of a blast furnace hearth and comprises an inner furnace shell and an outer furnace shell which are fixedly connected through a plurality of fixing pieces; a plurality of water-cooling pipes are laid between the inner furnace shell and the outer furnace shell, and heat-conducting refractory materials are filled outside the water-cooling pipes; the two ends of each water-cooled tube are respectively arranged at the outer sides of the upper end and the lower end of the double-layer furnace shell, one side of the inner furnace shell far away from the furnace hearth is welded with a plurality of groups of water tube positioning devices, and each group is provided with at least four positioning blocks which respectively abut against the two sides of the upper part and the lower part of the same water-cooled tube and are used for positioning the water-cooled tubes before installation.

Preferably, the water pipe positioning device further comprises a positioning block tightly attached to the lower end of the water cooling pipe.

Preferably, the outer furnace shell is formed by combining a plurality of layers distributed from bottom to top, and in two adjacent layers, the upper end surface of the lower layer is closely arranged with the lower end surface of the upper layer.

Preferably, the fixing piece is a plurality of bolts or screws, one end of the fixing piece is welded with one side, away from the hearth, of the inner furnace shell, the two ends of the fixing piece are perpendicular to each other, a through hole is formed in the corresponding position of the outer furnace shell, the other end of the fixing piece penetrates through the through hole, and a nut is installed on one side, away from the hearth, of the outer furnace shell in a threaded mode.

Preferably, the water-cooling pipe is a whole seamless straight-through pipe arranged along one side surface of the inner furnace shell far away from the hearth, and the upper end and the lower end of the outer furnace shell are provided with pipe distribution holes respectively used for the water inlet end and the water outlet end of the water-cooling pipe to pass through; the plurality of water-cooling pipes are distributed in a circumferential array along one side surface of the inner furnace shell far away from the furnace hearth by taking the central line of the furnace hearth as an axis.

Preferably, the lower ends of the inner and outer furnace shells and the water cooling tubes extend to the lower end of the outer side of the blast furnace bottom.

Preferably, the heat-conducting refractory material is a high-heat-conducting carbonaceous ramming mass.

Compared with the prior art, the utility model has the beneficial effects that:

1. this double-deck stove outer covering of no stave has adopted and has set up the water-cooled tube between the two-layer stove outer covering inside and outside to fill heat conduction refractory material's form, simple structure is reasonable, low cost, and simple to operate is quick, and the cooling effect is good.

2. This double-deck stove outer covering of no stave has avoided the cooling blind area that two staves of tradition meet, and the water pipe interval can be adjusted wantonly, has improved heat transfer specific surface area, and this utility model's cooling specific surface area can be close to pi in theory.

3. The double-layer furnace shell without the cooling wall has the following heat conducting links from inside to outside: the furnace comprises a hearth carbon brick, an inner furnace shell, a heat-conducting refractory material and a water-cooling pipe; the cooling structure of the traditional cooling wall is as follows: the furnace hearth carbon brick, the carbon pounding layer, the cast iron cooling wall body, the air gap layer and the water pipe; the cooling structure of the utility model reduces the maximum thermal resistance link-air gap layer in the traditional cooling structure and reduces the most difficult to control influence link-carbon material smashing layer in the furnace, thereby greatly improving the heat transfer efficiency.

4. The double-layer furnace shell without the cooling wall can realize the adjustment of the cooling strength at individual positions, and only the arrangement density of the water-cooling tubes in a certain area needs to be changed and/or the material of the water-cooling tubes needs to be adjusted.

5. This no double-deck stove outer covering of stave, the whole root of water-cooled tube is laid between inside and outside stove outer covering, and for the water pipe in the stave, this utility model's water-cooled tube is not the scaling loss of casting process, and the quality more can obtain guaranteeing, even the condition such as appearing leaking also can not influence the interior resistant material of stove, and can change at any time, safe and reliable more, easy maintenance.

6. This double-deck stove outer covering of no stave, whole water-cooled tube is longer, utilizes water pipe positioner to fix a position the installation, and skew leads to the cooling effect not to reach the design demand when can avoiding installing.

7. The double-layer furnace shell without the cooling wall reduces a carbon material smashing layer between the carbon bricks and the cooling wall and a casting material layer between the cooling wall and the furnace shell in the traditional furnace, and optimizes the structure in the furnace; the construction of the carbon ramming layer and the furnace shell castable layer in the furnace in the prior art is very difficult, and material gaps are very easy to appear at the two positions, so that conditions are created for the blast furnace gas carrying harmful metals to invade the refractory material of the furnace bottom and the furnace hearth. The cooling structure of the utility model well reduces the design of the two links, greatly reduces the construction difficulty and reduces the probability of harmful metal corrosion of refractory materials of the hearth and the hearth.

8. The inner furnace shell mainly plays the roles of bearing and sealing, but because the cooling wall is cancelled, the inner furnace shell reduces a plurality of cooling wall water inlet and outlet pipe openings compared with the traditional furnace shell.

9. The double-layer furnace shell without the cooling wall reduces the cooling wall and the accessory facilities thereof, reduces the equipment and the construction cost thereof, and saves the cost.

Drawings

FIG. 1 is a schematic front view of the present invention;

FIG. 2 is a schematic diagram of the water tube distribution of the present invention;

fig. 3 is an enlarged view of a point a in fig. 1.

In the figure: 1. an outer furnace shell; 2. an inner furnace shell; 3. a water-cooled tube; 4. a fixing member; 5. a thermally conductive refractory material; 6. and (5) positioning the blocks.

Detailed Description

As shown in fig. 1 to 3, a double-layered furnace shell without a cooling wall is arranged at the periphery of a carbon brick in a hearth of a blast furnace, and comprises an inner furnace shell 2 and an outer furnace shell 1 which are fixedly connected through a plurality of fixing pieces 4; a plurality of water-cooling tubes 3 are laid between the inner furnace shell 2 and the outer furnace shell 1, and heat-conducting refractory materials 5 are filled outside the water-cooling tubes 3; the two ends of each water-cooling tube 3 are respectively arranged at the outer sides of the upper end and the lower end of the double-layer furnace shell, compared with the prior art, the whole arrangement can effectively reduce the cooling blind area and increase the cooling specific surface area, in addition, the opening of the furnace shell can be reduced, one side of the inner furnace shell 2 far away from the furnace cylinder is welded with a plurality of groups of water tube positioning devices, each group is provided with four positioning blocks 6 which are respectively and closely attached to the two sides of the upper part and the lower part of the same water-cooling tube 3, as shown in figure 2, the positioning blocks 6 can also be arranged at the two sides of the middle part of the water-cooling tube 3, or when the water-cooling tube 3 is not a straight tube but a coil, more positioning blocks 6 can be arranged according to the pipeline structure, the aim is that after the inner furnace shell 2 is installed, the water-cooling tube 3 can be accurately positioned to the designed position without being askew, the uneven cooling is avoided, in addition, the positioning blocks 6 can also be welded at the lower end of the designed position of the water-cooling tube 3, the position is conveniently found, the water-cooled tube 3 does not slide downwards, and the water-cooled tube 3 can be fixed at the positioning block 6 in other modes, such as a bolt clamping hoop, welding and firm binding;

when the water cooling device is installed, an inner furnace shell 2 is fixedly installed along the periphery of a blast furnace hearth, then the water cooling device is distributed according to design, a positioning block 6 and a fixing block 4 of a water pipe positioning device are welded on one side, far away from the hearth, of the inner furnace shell 2, the inner furnace shell 2 can be welded firstly and then installed, in this way, the positioning is more accurate, each water cooling pipe 3 is installed between the positioning blocks 6 on two sides of each group of water pipe positioning devices, after the water cooling device is installed, an outer furnace shell 1 is installed on one side, far away from the hearth, of the inner furnace shell 2, a pipe distribution hole is preset on the outer furnace shell 1 or is formed during installation, the end part of each water cooling pipe 3 penetrates through the outer furnace shell 1, and a heat-conducting refractory material 5 is filled between the inner furnace shell 2 and the outer furnace shell 1 and tamped; in addition, after the inner furnace shell 2 is installed, the carbon bricks of the furnace hearth can be built inside the furnace hearth along one side, close to the inside of the furnace hearth, of the inner furnace shell 2 while the water-cooled tube 3 is fixed, the inner furnace shell 2 is tightly connected with the carbon bricks of the furnace hearth through building slurry, heat of the carbon bricks is better transmitted to the inner furnace shell 2, and the inner furnace shell 2 transmits the heat to the water-cooled tube 3 through the heat-conducting refractory material 5.

In a preferred embodiment, the outer furnace shell 1 is formed by combining a plurality of layers distributed from bottom to top, in two adjacent layers, the upper end surface of the lower layer is abutted against the lower end surface of the upper layer, in this embodiment, the outer shell 1 is installed in layers from bottom to top, each layer is sealed and welded, and once each layer is installed, the heat-conducting refractory material 5 is filled and tamped, and if there is a fear of material leakage during tamping, it can also be in two adjacent layers, sticking thin plates at the outer side between the upper end surface of the lower layer and the lower end surface of the upper layer for leakage prevention, tamping all the layers, and then removing the thin plates, thus, the layers of the outer furnace shell 1 are not fixed mutually and are convenient to disassemble, the later maintenance and the replacement or the change of the distribution of the water-cooled tubes 3 are convenient, particularly, the water-cooling pipe 3 is easy to scale or damage and leak after being used for a long time, and if the water-cooling pipe is definitely not needed, all layers of the outer furnace shell 1 can be sealed and welded.

In a preferred embodiment, the fixing member 4 is a plurality of bolts or screws, one end of the fixing member is welded to one side of the inner furnace shell 2 away from the hearth and is arranged perpendicular to the one side, a through hole is formed in the corresponding position of the outer furnace shell 1, the other end of the fixing member 4 penetrates through the through hole, and a nut is installed on one side of the outer furnace shell 1 away from the hearth in a threaded manner; in this embodiment, since the water cooling tube 3 is disposed between the outer furnace shell 1 and the inner furnace shell 2, the outer furnace shell 1 can be fixed to the periphery of the inner furnace shell 2 by tightening the nut, and a gap is left for filling the heat-conducting refractory material 5, and in addition, the nut can be tightened again after the installation is completed for compacting the heat-conducting refractory material 5 for the second time, thereby further improving the overall heat-conducting capability.

Referring to fig. 2, the water-cooling pipe 3 is preferably a whole seamless straight-through pipe arranged along one side surface of the inner furnace shell 2 far away from the hearth, and the upper end and the lower end of the outer furnace shell 1 are provided with pipe distribution holes for respectively passing through the water inlet end and the water outlet end of the water-cooling pipe 3; a plurality of water-cooling pipes 3 can be distributed in a circumferential array along one side surface of the inner furnace shell 2 away from the furnace hearth by taking the center line of the furnace hearth as an axis; the fixing pieces 4 can be arranged in a mode shown in fig. 2, namely 4 water cooling pipes 3 are arranged between the adjacent fixing pieces 4 at the same height, the distance between the adjacent fixing pieces 4 at different heights is about 1.5 times, and the specific requirement is determined according to the size of a blast furnace and the distance design of the adjacent water cooling pipes 3, wherein the smaller the distance between the water cooling pipes 3 is, the better the cooling effect is, but the operation cost is relatively increased.

In a preferred embodiment, the water-cooling tubes 3 are not distributed in a circumferential array, but the cooling intensity adjustment for individual positions can be realized by changing the arrangement density of the water-cooling tubes in a certain area and/or adjusting the material of the water-cooling tubes according to different actual cooling requirements of different positions of the hearth.

As shown in fig. 1, the lower ends of the inner shell 2, the outer shell 1 and the water-cooled tubes 3 extend to the lower end of the outer side of the furnace bottom of the blast furnace, and the lower ends of the inner shell 2 and the furnace bottom can be fixed in advance when the inner shell is installed.

Preferably, the heat-conducting refractory material 5 can be a carbon ramming mass with good heat-conducting property and indefinite shape or other high heat-conducting indefinite-shape bulk materials which are commonly used in the market.

The above description is only for the preferred embodiment of the present invention, but the scope of the present invention is not limited thereto, and any changes or substitutions that can be easily conceived by those skilled in the art within the technical scope of the present invention are also included in the scope of the present invention. Therefore, the protection scope of the present invention shall be subject to the protection scope defined by the claims.

The present invention is not described in detail, but is known to those skilled in the art.

Claims

1. The utility model provides a double-deck stove outer covering of no stave sets up in blast furnace hearth charcoal brick periphery department, its characterized in that: comprises an inner furnace shell (2) and an outer furnace shell (1), which are fixedly connected through a plurality of fixing pieces (4); a plurality of water-cooling tubes (3) are laid between the inner furnace shell (2) and the outer furnace shell (1), and heat-conducting refractory materials (5) are filled outside the water-cooling tubes (3); the two ends of each water-cooled tube (3) are respectively arranged at the outer sides of the upper end and the lower end of the double-layer furnace shell, one side, far away from the hearth, of the inner furnace shell (2) is welded with a plurality of groups of water tube positioning devices, and each group is provided with at least four positioning blocks (6) which are respectively close to the two sides of the upper part and the lower part of the same water-cooled tube (3) and used for positioning the water-cooled tube (3) before installation.

2. The stave-free double shell of claim 1 wherein: the water pipe positioning device also comprises a positioning block (6) tightly attached to the lower end of the water cooling pipe (3).

3. The stave-free double shell of claim 1 wherein: the outer furnace shell (1) is formed by combining a plurality of layers which are distributed from bottom to top, and in two adjacent layers, the upper end surface of the lower layer is abutted against the lower end surface of the upper layer.

4. The stave-free double shell of claim 1 wherein: the fixing piece (4) is a plurality of bolts or screws, one end of the fixing piece is welded with one side, far away from the hearth, of the inner furnace shell (2) and the two ends of the fixing piece are perpendicular to each other, a through hole is formed in the corresponding position of the outer furnace shell (1), the other end of the fixing piece (4) penetrates through the through hole, and a nut is installed on one side, far away from the hearth, of the outer furnace shell (1) in a threaded mode.

5. The stave-free double shell of claim 1 wherein: the water-cooling pipe (3) is a whole seamless straight-through pipe arranged along one side surface of the inner furnace shell (2) far away from the hearth, and the upper end and the lower end of the outer furnace shell (1) are provided with pipe distribution holes for the water inlet end and the water outlet end of the water-cooling pipe (3) to pass through respectively; the plurality of water cooling pipes (3) are distributed in a circumferential array along one side surface of the inner furnace shell (2) far away from the hearth by taking the central line of the hearth as an axis.

6. The stave-free double shell according to any one of claims 1 to 5, characterized in that: the lower ends of the inner furnace shell (2), the outer furnace shell (1) and the water cooling pipe (3) extend to the lower end of the outer side of the bottom of the blast furnace.

7. The stave-free double shell of claim 1 wherein: the heat-conducting refractory material (5) is a high-heat-conducting carbon ramming material.