Energy-saving blast furnace

Abstract

The utility model relates to the technical field of smelting, and discloses an energy-saving blast furnace which comprises a furnace body and a cooling tower, a cooling water pipe is embedded in the furnace body, a furnace base is fixedly arranged on the lower end face of the furnace body, a disc-shaped water pipe is embedded in the center, close to the upper end, in the furnace base, an annular air pipe is embedded in the center in the furnace base, and the annular air pipe is fixedly arranged in the furnace body. An annular air pipe is fixedly connected to the lower end of the outer wall of the furnace body in a sleeving mode, and air outlet pipes are fixedly arranged at the centers of the opposite sides of the outer wall of the annular air pipe. According to the utility model, the furnace body and the furnace base are cooled through water circulation formed by the disc-shaped water pipe, the first branch pipe, the cooling tower, the water return pipe, the cooling water pipe and the second branch pipe, meanwhile, water resource waste caused by frequent replacement of cooling water can be reduced, and oxygen-enriched air in the annular air pipe can be heated through the furnace base; and fuel waste caused by independent heating of the oxygen-enriched air is prevented.

Description

Technical Field

[0001] The utility model relates to the technical field of smelting, in particular to an energy-saving blast furnace. Background Art

[0002] The blast furnace is the main equipment for iron-making production. It has the advantages of large output, high productivity and low cost, which are unmatched by other iron-making methods. Therefore, blast furnace iron-making is the most commonly used iron-making method. The iron produced by this method accounts for the vast majority of the world's total iron. The main product of blast furnace smelting is pig iron, as well as by-products blast furnace slag and blast furnace gas.

[0003] Common blast furnaces are mostly used to cool down the furnace body, which can easily cause the furnace base to overheat and break after long-term use, affecting the use of the blast furnace. In addition, the oxygen-rich high-temperature air blown into the traditional blast furnace usually needs to be heated separately, which consumes a large amount of extra fuel. Therefore, the utility model provides an energy-saving blast furnace to solve the problems raised in the above background technology. Utility Model Content

[0004] The utility model aims to solve the shortcomings existing in the prior art and proposes an energy-saving blast furnace. By arranging a disc-shaped water pipe and an annular air pipe in the furnace base, the heat transferred by the furnace base can heat the oxygen-enriched air blown into the annular air pipe when the furnace base is effectively cooled, thereby saving the fuel consumed in heating the air alone.

[0005] To achieve the above-mentioned purpose, the utility model provides the following technical solutions: comprising a furnace body and a cooling tower, wherein a cooling water pipe is embedded in the furnace body, a furnace seat is fixedly arranged on the lower end surface of the furnace body, a disc-shaped water pipe is embedded in the center of the furnace seat near the upper end, an annular air pipe is embedded in the center of the furnace seat, an annular air duct is fixedly sleeved on the outer wall of the furnace body near the lower end, and an air outlet pipe is fixedly arranged at the center of the opposite side of the outer wall of the annular air duct;

[0006] One end of the annular air pipe is fixedly arranged at the center of one side of the outer wall of the annular air pipe away from the furnace body, a blower box is fixedly sleeved near the other end of the outer wall of the annular air pipe, a fan is rotatably arranged near the center of the inner wall of the blower box near one side, a return water pipe is fixedly arranged at the center of the upper end surface of the cooling tower, a No. 1 branch pipe is fixedly arranged at the center of one side of the cooling tower near the lower end, one end of the No. 1 branch pipe is fixedly connected to one end of the disc-shaped water pipe, and a No. 2 branch pipe is fixedly arranged at the other end of the disc-shaped water pipe;

[0007] Through the above technical scheme, the design of the cooling water pipe is convenient for cooling the furnace body, preventing the furnace body from cracking due to excessive combustion temperature in the furnace and reducing the service life of the furnace body. The design of the disc-shaped water pipe is convenient for cooling the furnace base, preventing the furnace base from cracking due to excessive temperature and reducing the service life of the furnace base. The design of the annular air pipe is convenient for heating the oxygen-enriched air introduced into the annular air pipe through the high temperature transmitted in the furnace base, reducing the fuel wasted by heating the air alone. The design of the annular air duct and the air outlet pipe is convenient for evenly introducing the oxygen-enriched air into the furnace body. The design of the blower box and the fan is convenient for blowing the oxygen-enriched air into the annular air pipe. The design of the cooling tower is convenient for cooling the boiling water in the cooling water pipe and the disc-shaped water pipe. The design of the return pipe is convenient for passing the water cooled in the cooling tower into the cooling pipe. The design of the No. 1 branch pipe is convenient for passing the boiling water in the disc-shaped water pipe into the cooling tower. The design of the No. 2 branch pipe is convenient for connecting the cooling water pipe and the disc-shaped water pipe. The cooling water can be recycled for many times, which has the effect of saving water resources.

[0008] Furthermore, a furnace cover is clamped on the upper end surface of the furnace body, a charging port is provided at the upper end of the furnace cover, and a gas injection port is provided at one side of the outer wall of the furnace cover near the upper end;

[0009] Through the above technical scheme, the design of the furnace cover can reduce the heat loss in the furnace body, the design of the feeding port is convenient for feeding the ore to be smelted into the furnace body, and the design of the gas injection port is convenient for introducing the combustion-supporting gas into the blast furnace, thereby increasing the combustion rate in the furnace.

[0010] Furthermore, one end of the return water pipe is embedded in the upper end of one side of the outer wall of the furnace body and fixedly connected to the cooling water pipe, and one end of the cooling water pipe is fixedly connected to the second branch pipe;

[0011] Through the above technical scheme, the design of the connection between the return pipe and the cooling water pipe facilitates the passage of cooling water that has been cooled in the cooling tower into the cooling water pipe. The design of the fixed connection between the cooling water pipe and the No. 2 branch pipe facilitates the passage of cooling water in the cooling water pipe into the disc-shaped water pipe through the No. 2 branch pipe. The cooling water flowing in the disc-shaped water pipe takes away the high temperature of the furnace base.

[0012] Furthermore, a slag outlet is provided at the lower end of one side of the furnace body, and an iron outlet is provided at the lower end of the other side of the furnace body, and the vertical height of the slag outlet is higher than the iron outlet;

[0013] Through the above technical solution, the design of the slag outlet being higher than the iron outlet facilitates the diversion and collection of the molten iron and slag, so that the molten iron flows out along the iron outlet at the bottom, and the slag floating above the molten iron is taken out from the slag outlet at the top after the molten iron is filtered out.

[0014] Furthermore, the inner wall of the furnace body is fixedly provided with pre-slag skin material;

[0015] Through the above technical scheme, the design of pre-slag skin material facilitates the formation of a heat insulation layer on the surface of the inner wall of the furnace body, preventing the high-temperature airflow, flame and coal slag in the furnace from scouring the inner wall of the furnace body, reducing the loss of the inner wall of the furnace body and extending the service life of the furnace body.

[0016] Furthermore, the two air outlet pipes are embedded in both sides of the furnace body, and one end of the two air outlet pipes embedded in the furnace body penetrates the inner wall of the furnace body and the pre-slag skin material;

[0017] Through the above technical scheme, the design of the air outlet duct embedded in the two sides of the furnace body facilitates the uniform passage of the high-temperature oxygen-rich air in the annular duct into the furnace body. The design of the air outlet duct embedded in the furnace body on one side passes through the furnace body wall and the pre-slag skin material to reduce the direct erosion of the furnace body and the pre-slag skin material by the high-temperature airflow, thereby extending the service life.

[0018] Furthermore, the disc-shaped water pipe, the No. 1 branch pipe, the cooling tower, the return pipe, the cooling water pipe and the No. 2 branch pipe are connected with each other;

[0019] Through the above technical solution, the design of the through-and-through communication between the disc-shaped water pipe, branch pipe No. 1, cooling tower, return pipe, cooling water pipe and branch pipe No. 2 facilitates the circulation of cooling water in the blast furnace, and at the same time facilitates the cooling water to enter the cooling tower for cooling, thereby reducing the loss of water resources.

[0020] The utility model has the following beneficial effects:

[0021] 1. The utility model proposes an energy-saving blast furnace. After the cooling water cooled by the cooling tower enters the disc-shaped water pipe, the heat in the furnace base can be taken out through the flow of the cooling water to cool the furnace base. At the same time, the oxygen-enriched air blown into the annular air pipe by the blower can be heated by the heat transferred from the furnace base and can take out part of the heat in the furnace base, thereby preventing the furnace base from breaking under the influence of long-term high temperature and extending the service life of the furnace base.

[0022] 2. The utility model proposes an energy-saving blast furnace. After the oxygen-enriched air is blown into the annular air pipe by a blower, the heat transferred from the furnace seat can heat the oxygen-enriched air in the annular air pipe, thereby reducing the fuel wasted by heating the oxygen-enriched air alone, and avoiding the influence of the low-temperature oxygen-enriched air on the smelting temperature in the blast furnace after being blown into the blast furnace. At the same time, the design of the disc-shaped water pipe, the No. 1 branch pipe, the cooling tower, the return water pipe, the cooling water pipe and the No. 2 branch pipe that are connected through and through reduces the loss of water resources, thereby achieving an energy-saving effect. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 It is an axonometric schematic diagram of the utility model;

[0024] Figure 2It is a front cross-sectional schematic diagram of the utility model;

[0025] Figure 3 For the utility model Figure 2 The enlarged schematic diagram at A in the middle;

[0026] Figure 4 It is a top-sectional schematic diagram of the furnace base of the utility model.

[0027] Legend:

[0028] 1. Furnace body; 2. Pre-slag skin material; 3. Furnace cover; 4. Feeding port; 5. Air injection port; 6. Return pipe; 7. Cooling tower; 8. Furnace base; 9. Cooling water pipe; 10. No. 1 branch pipe; 11. Blower box; 12. Fan; 13. Annular air pipe; 14. Slag outlet; 15. Annular air duct; 16. Air outlet pipe; 17. Iron outlet; 18. Disc water pipe; 19. No. 2 branch pipe. DETAILED DESCRIPTION

[0029] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0030] Example

[0031] Reference Figure 1-4 The utility model provides an embodiment: comprising a furnace body 1 and a cooling tower 7, wherein a cooling water pipe 9 is embedded in the furnace body 1, and the design of the cooling water pipe 9 is convenient for cooling the furnace body 1, so as to prevent the furnace body 1 from cracking due to excessive combustion temperature in the furnace and reducing the service life of the furnace body 1, and a furnace seat 8 is fixedly arranged on the lower end surface of the furnace body 1, and a disc-shaped water pipe 18 is embedded in the center of the furnace seat 8 near the upper end, and the design of the disc-shaped water pipe 18 is convenient for cooling the furnace seat 8, so as to prevent the furnace seat 8 from cracking due to excessive temperature and reducing the service life of the furnace seat 8 In order to improve the service life, an annular air pipe 13 is embedded in the center of the furnace seat 8. The design of the annular air pipe 13 is convenient for heating the oxygen-enriched air introduced into the annular air pipe 13 through the high temperature transmitted in the furnace seat 8, thereby reducing the fuel wasted by heating the air alone. An annular air pipe 15 is fixedly sleeved at the lower end of the outer wall of the furnace body 1, and an air outlet pipe 16 is fixedly arranged at the center of the opposite side of the outer wall of the annular air pipe 15. The design of the annular air pipe 15 and the air outlet pipe 16 is convenient for evenly introducing the oxygen-enriched air into the furnace body 1;

[0032] One end of the annular air pipe 13 is fixedly arranged at the center of one side of the outer wall of the annular air pipe 15 away from the furnace body 1, and a blower box 11 is fixedly sleeved near the other end of the outer wall of the annular air pipe 13. A fan 12 is rotatably arranged near the center of the inner wall of the blower box 11 near one side. The design of the blower box 11 and the fan 12 facilitates the blowing of oxygen-enriched air into the annular air pipe 13. A return water pipe 6 is fixedly arranged at the center of the upper end surface of the cooling tower 7. A No. 1 branch pipe 10 is fixedly arranged at the center of the lower end of one side of the cooling tower 7. The design of tower 7 is convenient for cooling the boiling water in cooling water pipe 9 and disc-shaped water pipe 18. One end of branch pipe No. 10 is fixedly connected to one end of disc-shaped water pipe 18, and branch pipe No. 2 19 is fixedly provided at the other end of disc-shaped water pipe 18. Branch pipe No. 1 10 is convenient for passing the boiling water in disc-shaped water pipe 18 into cooling tower 7, and branch pipe No. 2 19 is convenient for connecting cooling water pipe 9 and disc-shaped water pipe 18. Cooling water can be recycled for multiple times, which has the effect of saving water resources.

[0033] When in use, after the furnace cover 3 is snapped onto the upper end surface of the furnace body 1, the extinguished coke, iron ore and flux for slag making are first put in through the feeding port 4, and then the oxygen-enriched air is passed into the annular air pipe 13 at a suitable flow rate through the blower box 11, and the oxygen-enriched air in the annular air pipe 13 is passed into the furnace body 1 along the annular air pipe 15 and the air outlet pipe 16. After the coke is reignited, combustion-supporting gas is passed into the furnace body 1 through the air injection port 5. When the iron ore in the furnace body 1 begins to burn fully, the introduction of combustion-supporting gas is stopped, and then the power of the fan 12 is increased so that the oxygen-enriched air is passed into the furnace body 1 at a higher flow rate. At this time, the oxygen-enriched air in the annular air pipe 13 can be heated by the heat transferred by the furnace seat 8 to prevent the oxygen-enriched air with a lower temperature from passing into the furnace body 1 and affecting the smelting temperature in the furnace body 1.

[0034] When the temperature in the furnace body 1 is too high, the furnace body 1 can be protected by pre-hanging slag skin material 2 to prevent the furnace body 1 from being washed by high-temperature gas for a long time to reduce the service life of the furnace body 1. Then, the cooling tower 7 is started to make the cooling water in the cooling water pipe 9 flow into the disc-shaped water pipe 18 along the second branch pipe 19 to cool the furnace seat 8. At the same time, the temperature of the cooling water that absorbs heat rises. Then, the cooling water with the increased temperature is passed into the cooling tower 7 along the first branch pipe 10 to be cooled, and then merged into the cooling water pipe 9 through the return pipe 6 to form a water Circulation, while cooling the furnace body 1 and the furnace base 8 through water circulation, the frequency of replacing cooling water is reduced through the cooling tower 7, which saves water resources and prolongs the service life of the furnace body 1 and the furnace base 8. The molten iron after smelting flows out along the iron outlet 17 at the bottom, and the slag floating above the molten iron is taken out from the slag outlet 14 at the top after the molten iron is filtered out. The remaining slag can form a slag skin on the upper end surface of the furnace base 8 after cooling, so as to protect the furnace base 8 and prolong the service life of the furnace base 8.

[0035] Working principle: The furnace base 8 is cooled by the disc-shaped water pipe 18 to prevent the furnace base 8 from being exposed to high-temperature air for a long time, which may cause cracking of the furnace base 8 and reduce the service life of the furnace base 8. At the same time, the boiling cooling water is cooled by the cooling tower 7 and then introduced into the cooling water pipe 9 through the return pipe 6. While cooling the furnace body 1 and the furnace base 8 through water circulation, the waste of water resources caused by frequent replacement of cooling water is reduced. The high temperature of the furnace base 8 can be used to heat the oxygen-enriched air in the annular air pipe 13 to prevent the low-temperature oxygen-enriched air from affecting the smelting temperature in the furnace and reduce the fuel waste caused by heating the oxygen-enriched air alone.

[0036] Finally, it should be noted that the above is only a preferred embodiment of the present invention and is not intended to limit the present invention. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art can still modify the technical solutions described in the aforementioned embodiments or make equivalent substitutions for some of the technical features therein. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. An energy-saving blast furnace, comprising a furnace body (1) and a cooling tower (7), characterized in that: A cooling water pipe (9) is embedded in the furnace body (1), a furnace seat (8) is fixedly arranged on the lower end surface of the furnace body (1), a disc-shaped water pipe (18) is embedded in the center of the furnace seat (8) near the upper end, an annular air pipe (13) is embedded in the center of the furnace seat (8), an annular air duct (15) is fixedly sleeved on the outer wall of the furnace body (1) near the lower end, and an air outlet pipe (16) is fixedly arranged at the center of the outer wall of the annular air duct (15) on the opposite side; One end of the annular air pipe (13) is fixedly arranged at the center of one side of the outer wall of the annular air pipe (15) away from the furnace body (1), and a blower box (11) is fixedly sleeved near the other end of the outer wall of the annular air pipe (13). A fan (12) is rotatably arranged near the center of the inner wall of the blower box (11) near one side. A return water pipe (6) is fixedly arranged at the center of the upper end surface of the cooling tower (7), and a branch pipe No. 1 (10) is fixedly arranged at the center of one side of the cooling tower (7) near the lower end. One end of the branch pipe No. 1 (10) is fixedly connected to one end of a disc-shaped water pipe (18), and a branch pipe No. 2 (19) is fixedly arranged at the other end of the disc-shaped water pipe (18).

2. An energy-saving blast furnace according to claim 1, characterized in that: A furnace cover (3) is clamped on the upper end surface of the furnace body (1), a material feeding port (4) is provided at the upper end of the furnace cover (3), and a gas injection port (5) is provided on one side of the outer wall of the furnace cover (3) near the upper end.

3. An energy-saving blast furnace according to claim 1, characterized in that: One end of the return water pipe (6) is embedded in one side of the outer wall of the furnace body (1) near the upper end and fixedly connected to the cooling water pipe (9), and one end of the cooling water pipe (9) is fixedly connected to the second branch pipe (19).

4. An energy-saving blast furnace according to claim 1, characterized in that: A slag outlet (14) is provided at the lower end of one side of the furnace body (1), and an iron outlet (17) is provided at the lower end of the other side of the furnace body (1). The vertical height of the slag outlet (14) is higher than that of the iron outlet (17).

5. The energy-saving blast furnace according to claim 1, characterized in that: The inner wall of the furnace body (1) is fixedly provided with a pre-slag skin material (2).

6. The energy-saving blast furnace according to claim 1, characterized in that: The two air outlet pipes (16) are both embedded in both sides of the furnace body (1), and one end of the two air outlet pipes (16) embedded in the furnace body (1) penetrates the inner wall of the furnace body (1) and the pre-slag skin material (2).

7. An energy-saving blast furnace according to claim 1, characterized in that: The disc-shaped water pipe (18), the first branch pipe (10), the cooling tower (7), the return pipe (6), the cooling water pipe (9) and the second branch pipe (19) are interconnected.

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