Blast furnace hot blast stove for fuel gas mixing

Abstract

The utility model relates to the technical field of blast furnace ironmaking, and discloses a blast furnace hot blast stove for fuel gas mixing, which comprises a stove body, a gas supply end of the stove body is communicated with a mixing box, a mixing component is connected in the mixing box, and one side of the mixing box far away from the stove body is communicated with an air inlet pipe and a fuel gas inlet pipe. According to the blast furnace hot blast stove for fuel gas mixing, air and fuel gas are injected into the mixing box through the inlet pipes which work synchronously and are fully mixed through the mixing assembly in the mixing box. Then, the mixed gas is guided into the furnace body to be combusted, and it is ensured that the fuel gas is completely combusted. The process effectively reduces the generation of harmful gases such as carbon monoxide, and further improves the use safety of the hot blast stove.

Description

TECHNICAL FIELD

[0001] The utility model relates to blast furnace ironmaking technical field, concretely for a kind of blast furnace hot blast stove for gas mixing. BACKGROUND

[0002] In the process of blast furnace ironmaking, hot blast stove is a key device, mainly used for heating air, in the form of high-temperature hot blast, into blast furnace, support combustion process and improve ironmaking efficiency. Hot blast stove heats checker bricks in regenerator by burning gas (usually from by-product gas generated by blast furnace itself or natural gas, etc.), and then blows cold air through the heated checker bricks to make them quickly warm up into hot blast. But in this process. Because the combustion gas and air cannot be effectively mixed, the combustion gas cannot be fully burned, resulting in a large amount of carbon monoxide, nitrogen oxides and other harmful gases. In order to avoid pollution of these harmful gases to the environment, special treatment is usually required, which greatly increases the cost of ironmaking.

[0003] The patent with the current announcement number CN218510885U discloses a hot blast stove low-nitrogen combustion device, which includes a furnace shell with a combustion chamber and a furnace lining arranged on the furnace shell. Along the height direction of the furnace lining, the furnace lining is sequentially provided with an upper air-fuel mixing structure, a middle air-fuel mixing structure and a lower air-fuel mixing structure. The upper air-fuel mixing structure is inclinedly arranged at a first angle towards the middle air-fuel mixing structure, and the lower air-fuel mixing structure is inclinedly arranged at a second angle towards the middle air-fuel mixing structure. Through the cooperation of the upper air-fuel mixing structure and the lower air-fuel mixing structure, the mixing uniformity between air and gas can be improved, so that the gas and air can be fully burned, thereby improving the combustion efficiency, reducing the flame length and reducing the generation of nitrogen oxides.

[0004] However, the hot blast stove device in the above-mentioned technology still has the following problems: air and gas enter the inside of the furnace body for mixing and combustion, and the exhaust gas after combustion may be mixed in the air and gas. This part of exhaust gas will hinder the mixing of gas and air, causing the gas to not burn smoothly, and even causing the gas to not burn fully, producing carbon monoxide and other harmful gases, which has certain safety hazards. UTILITY MODEL CONTENTS

[0005] In view of the deficiencies of the prior art, the utility model provides a blast furnace hot blast stove for gas mixing, which improves the safety of the hot blast stove.

[0006] To achieve the above-mentioned purpose, the utility model provides the following technical scheme: a blast furnace hot blast stove for gas mixing, which includes a furnace body, a mixing box communicated with the gas inlet end of the furnace body, a mixing assembly connected in the mixing box, and an air inlet pipe and a gas inlet pipe communicated with the side of the mixing box away from the furnace body.

[0007] Further, two mixing boxes are arranged, and two through pipes are arranged between the two mixing boxes, two ends of the two through pipes are fixedly connected with the two mixing boxes and communicate with each other, and the air inlet pipe and the gas inlet pipe are fixedly connected with the two through pipes and communicate with each other.

[0008] Further, the outer walls of the two ends of the through pipe are fixedly connected with air injection valves.

[0009] Further, the mixing box is fixedly connected with a mixing pipeline on one side close to the furnace body and communicates with the mixing pipeline, the other end of the mixing pipeline is fixedly connected with the furnace body and communicates with the furnace body, and the outer wall of the mixing pipeline is fixedly connected with an exhaust valve.

[0010] Further, the inner wall of one end of the mixing pipeline close to the furnace body is fixedly connected with a nozzle, and the injection end of the nozzle extends into the furnace body.

[0011] Further, the mixing assembly comprises a rotating shaft and a plurality of fan blades, the rotating shaft is located at the axis position of the mixing box, one end of the rotating shaft is rotatably connected with the inner wall of the end of the mixing box, the other end of the rotating shaft is connected with a support assembly, and the plurality of fan blades are fixed on the outer side of the rotating shaft.

[0012] Further, the support assembly comprises a bearing and a plurality of support rods, the bearing is sleeved and fixed on the end of the rotating shaft, the plurality of support rods are uniformly distributed along the outer side of the bearing, the plurality of support rods are fixedly connected with the bearing, and the other ends of the plurality of support rods are fixedly connected with the inner wall of the mixing box.

[0013] Compared with the prior art, the utility model has the following beneficial effects:

[0014] The blast furnace hot blast stove for gas mixing, air and gas are injected into the mixing box through the inlet pipe working synchronously, and are fully mixed through the internal mixing assembly. Subsequently, the mixed gas is introduced into the furnace body for combustion, ensuring complete combustion of the gas. This process effectively reduces the generation of harmful gases such as carbon monoxide, thereby improving the use safety of the hot blast stove. BRIEF DESCRIPTION OF DRAWINGS

[0015] Figure 1 It is a whole appearance connection structure schematic view of the utility model;

[0016] Figure 2 It is a mixing box cross-section structure schematic view of the utility model;

[0017] Figure 3 It is another angle connection structure schematic view based on Figure 2

[0018] Figure 4 It is a mixing assembly connection structure schematic view of the utility model.

[0019] ​In the diagram: 1. Furnace body; 2. Mixing box; 3. Air inlet pipe; 4. Gas inlet pipe; 5. Through pipe; 6. Gas injection valve; 7. Mixing pipe; 8. Exhaust valve; 9. Nozzle; 10. Rotating shaft; 11. Fan blade; 12. Bearing; 13. Support rod. Detailed Implementation

[0020] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present utility model. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments.

[0021] Please see Figures 1 to 4 A blast furnace hot blast stove for gas mixing includes a furnace body 1, a mixing box 2 connected to the gas supply end of the furnace body 1, a mixing component connected inside the mixing box 2, and an air inlet pipe 3 and a gas inlet pipe 4 connected to the side of the mixing box 2 away from the furnace body 1.

[0022] like Figures 1 to 4 As shown, the blast furnace hot blast stove for gas mixing in this invention is structurally similar to existing blast furnace hot blast stoves. The main improvement of this invention lies in enhancing the safety of gas combustion within the furnace body 1, such as... Figures 1 to 4 As shown, in the blast furnace hot blast stove for gas mixing of this utility model, air and gas are injected into the mixing box 2 through the air inlet pipe 3 and the gas inlet pipe 4 respectively. The air and gas entering the mixing box 2 are fully mixed by the internal mixing components. The mixed gas then enters the furnace body 1 and can be fully burned, thereby avoiding the generation of harmful gases such as carbon monoxide due to incomplete combustion of gas and improving the safety of hot blast stove use.

[0023] like Figures 1 to 3 As shown, there are two mixing chambers 2, and two connecting pipes 5 connect the two mixing chambers 2. The two ends of the two connecting pipes 5 are fixedly connected to and communicate with the two mixing chambers 2 respectively. The air inlet pipe 3 and the gas inlet pipe 4 are fixedly connected to and communicate with the two connecting pipes 5 respectively. The gas introduced through the air inlet pipe 3 and the gas inlet pipe 4 can be dispersed into multiple mixing chambers 2 through the connecting pipes 5, avoiding a large amount of gas entering the mixing chamber 2 without effective mixing, improving the gas mixing effect in the mixing chamber 2, and avoiding the generation of a load in a single mixing chamber 2.

[0024] like Figures 1 to 3 As shown, air injection valves 6 are fixedly connected to the outer walls of both ends of the pipe 5. The air injection valves 6 can control the speed at which gas enters the mixing chamber 2, ensuring that the ratio of air to gas entering the mixing chamber 2 meets the requirements for complete combustion of the gas.

[0025] like Figures 1 to 3As shown, a mixing pipe 7 is fixedly connected to and communicates with the side of the mixing chamber 2 near the furnace body 1. The other end of the mixing pipe 7 is fixedly connected to and communicates with the furnace body 1. An exhaust valve 8 is fixedly connected to the outer wall of the mixing pipe 7. The speed at which the mixed gas enters the furnace body 1 from the mixing chamber 2 can be controlled by the exhaust valve 8 and the mixing pipe 7, ensuring that the air and gas are fully mixed in the mixing chamber 2 before entering the furnace body 1 for complete combustion.

[0026] like Figure 2 and Figure 3 As shown, a nozzle 9 is fixedly connected to the inner wall of the mixing pipe 7 near one end of the furnace body 1, and the injection end of the nozzle 9 extends into the furnace body 1. The mixed gas is injected from the nozzle 9 at the end of the mixing pipe 7 into the interior of the furnace body 1 for combustion, so that the combustion flame can be injected into the interior of the furnace body 1, thereby avoiding damage to the end of the mixing pipe 7 caused by the high temperature of the flame.

[0027] like Figures 1 to 4 As shown, the mixing assembly includes a rotating shaft 10 and multiple sets of fan blades 11. The rotating shaft 10 is located on the axis of the mixing chamber 2. One end of the rotating shaft 10 is rotatably connected to the inner wall of the end of the mixing chamber 2, and the other end of the rotating shaft 10 is connected to a support assembly. The multiple sets of fan blades 11 are all fixed to the outside of the rotating shaft 10. When air or gas enters the mixing chamber 2 from the pipe 5, the gas impacts the fan blades 11 on the rotating shaft 10, thereby causing the fan blades 11 to rotate. Through the design of multiple sets of fan blades 11, the gas inside the mixing chamber 2 is fully mixed under the rotation and agitation of the multiple sets of fan blades 11, improving the mixing effect and mixing efficiency of air and gas inside the mixing chamber 2.

[0028] like Figures 1 to 4 As shown, the support assembly includes a bearing 12 and several support rods 13. The bearing 12 is sleeved and fixed to the end of the rotating shaft 10. The several support rods 13 are evenly distributed along the outer side of the bearing 12, and each support rod 13 is fixedly connected to the bearing 12. The other end of each support rod 13 is fixedly connected to the inner wall of the mixing chamber 2. When the rotating shaft 10 rotates, it is kept rotating in the middle position of the multiple support rods 13 by the bearing 12. The bearing 12 can also reduce the frictional loss when the rotating shaft 10 rotates, so that the fan blades 11 on the outer side of the rotating shaft 10 can rotate and stir the gas more smoothly.

[0029] Although 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 alterations can be made to these embodiments without departing from the principles and spirit of the present invention.

Claims

1. A blast furnace hot blast stove for gas mixing, comprising a furnace body (1), characterized in that: The gas supply end of the furnace body (1) is connected to a mixing box (2), and a mixing component is connected inside the mixing box (2). An air inlet pipe (3) and a gas inlet pipe (4) are connected to the side of the mixing box (2) away from the furnace body (1).

2. A blast furnace hot blast stove for gas mixing according to claim 1, characterized in that: There are two mixing boxes (2), and two pipes (5) are connected between the two mixing boxes (2). The two ends of the two pipes (5) are fixedly connected to the two mixing boxes (2) and connected. The air inlet pipe (3) and the gas inlet pipe (4) are fixedly connected to the two pipes (5) and connected.

3. A blast furnace hot blast stove for gas mixing according to claim 2, characterized in that: Air injection valves (6) are fixedly connected to the outer walls of both ends of the pipe (5).

4. A blast furnace hot blast stove for gas mixing according to claim 1, 2 or 3, characterized in that: The mixing box (2) is fixedly connected to and connected to the mixing pipe (7) on the side near the furnace body (1). The other end of the mixing pipe (7) is fixedly connected to and connected to the furnace body (1). An exhaust valve (8) is fixedly connected to the outer wall of the mixing pipe (7).

5. A blast furnace hot blast stove for gas mixing according to claim 4, characterized in that: A nozzle (9) is fixedly connected to the inner wall of the mixing pipe (7) near the furnace body (1), and the spraying end of the nozzle (9) extends into the furnace body (1).

6. A blast furnace hot blast stove for gas mixing according to claim 1, 2, 3 or 5, characterized in that: The mixing assembly includes a rotating shaft (10) and multiple sets of fan blades (11). The rotating shaft (10) is located on the axis of the mixing box (2). One end of the rotating shaft (10) is rotatably connected to the inner wall of the end of the mixing box (2). The other end of the rotating shaft (10) is connected to a support assembly. The multiple sets of fan blades (11) are all fixed on the outside of the rotating shaft (10).

7. A blast furnace hot blast stove for gas mixing according to claim 6, characterized in that: The support assembly includes a bearing (12) and several support rods (13). The bearing (12) is sleeved and fixed at the end of the rotating shaft (10). Several support rods (13) are evenly distributed along the outside of the bearing (12). Several support rods (13) are fixedly connected to the bearing (12). The other end of several support rods (13) is fixedly connected to the inner wall of the mixing box (2).

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