Double-cavity cooling type blast furnace belly pipe

Abstract

The utility model provides a double-cavity cooling type blast furnace belly pipe which comprises a pipe body, the front end of the pipe body is connected with a front end head, the front end head comprises a ball head and a plugging piece used for connecting the ball head and the pipe body, and the two ends of the plugging piece are connected with the pipe body and the ball head in a welded mode respectively. The arc-shaped part of the ball head is matched with the tuyere small sleeve, an inner cooling cavity and an outer cooling cavity are formed in the ball head, and the inner cooling cavity and the outer cooling cavity are coaxially arranged in a sleeved mode. The inner cooling cavity and the outer cooling cavity are divided into a water inlet area and a water return area through a partition, a water inlet hole is formed in the water inlet area, a water return hole is formed in the water return area, a water inlet sleeve is installed at the water inlet hole, and a water return sleeve is installed at the water return hole. According to the double-cavity cooling structure, the cooling effect can be enhanced, the temperature of the front end of the belly pipe is effectively reduced, the belly pipe is prevented from being burnt through, the spherical surface sealing contact range can be guaranteed, air leakage is prevented, and therefore the service life of the air supply device is prolonged.

Description

TECHNICAL FIELD

[0001] The utility model relates to the field of blast furnace ironmaking, in particular to a double-cavity cooling type blast furnace tuyere. BACKGROUND

[0002] The blast furnace air supply device is located at the end of the hot blast pipeline, and is connected with the hot blast surround pipe and the blast furnace. The hot blast generated by the hot blast furnace is sent into the blast furnace through the hot blast surround pipe by the air supply device through the tuyere small sleeve, and at the same time, fuel is directly injected into the blast furnace through the coal injection gun. The tuyere is the terminal component of the blast furnace air supply device, and its working condition is the worst. The front end of the tuyere is in sealed contact with the tuyere small sleeve through the outer convex spherical surface. Since the front end is located at the highest temperature position, the front end is often burned through, which requires shutdown and replacement of the front end, thereby affecting the normal production of the blast furnace ironmaking, causing safety hazards to the operators, and increasing the ironmaking cost.

[0003] Chinese patent CN202120340356.5 discloses a safe and energy-saving blast furnace air supply device tuyere. A cooling chamber is arranged at the end head part to timely cool the end head by cooling water, effectively reducing the overall temperature of the tuyere, and the temperature of the front end part can be less than 100℃, thereby improving the service life of the tuyere and avoiding the occurrence of red shell and burning-through accidents. However, it is found in use that the end head structure provided with the cooling chamber is too long and is not suitable for smaller blast furnaces. If the length of the end head is shortened, the cooling chamber area is reduced, and the expected cooling effect cannot be achieved. Moreover, the end head structure is integrally manufactured, which is difficult to process and manufacture. SUMMARY

[0004] To solve the above problems in the prior art, the purpose of the utility model is to provide a double-cavity cooling type blast furnace tuyere with better cooling effect, low processing difficulty, and capable of meeting the use of small-size blast furnaces.

[0005] To solve the above technical problems, the utility model adopts the following technical scheme:

[0006] A double-cavity cooling type blast furnace tuyere, comprising a pipe body, a front end head connected to the front end of the pipe body, the front end head comprising a ball head and a blocking piece for connecting the ball head and the pipe body, the blocking piece being welded and connected to the pipe body and the ball head at both ends, respectively, the arc-shaped part of the ball head being matched with a tuyere small sleeve, an inner cooling chamber and an outer cooling chamber being arranged inside the ball head, and the inner cooling chamber and the outer cooling chamber being coaxially sleeved.

[0007] The utility model is further improved in that the inner cooling chamber and the outer cooling chamber are divided into a water inlet area and a water return area by a partition, a water inlet hole is arranged in the water inlet area, a water return hole is arranged in the water return area, a water inlet sleeve pipe is installed at the water inlet hole, and a water return sleeve pipe is installed at the water return hole.

[0008] The further improvement of the utility model lies in that the water inlet hole and the water return hole are arranged close to the partition.

[0009] The further improvement of the utility model lies in that the water inlet sleeve pipe and the water return sleeve pipe are arranged obliquely along the pipe body.

[0010] The further improvement of the utility model lies in that the water inlet sleeve pipe and the water return sleeve pipe are arranged obliquely along the pipe body.

[0011] The further improvement of the utility model lies in that the water inlet sleeve pipe and the water return sleeve pipe are arranged obliquely along the pipe body.

[0012] The further improvement of the utility model lies in that the water inlet sleeve pipe and the water return sleeve pipe are arranged obliquely along the pipe body.

[0013] The further improvement of the utility model lies in that the water inlet sleeve pipe and the water return sleeve pipe are arranged obliquely along the pipe body.

[0014] The utility model provides a kind of double-cavity cooling type blast furnace straight blow pipe, its ball head is provided with double-cavity cooling structure, can strengthen cooling effect, effectively reduce the temperature of straight blow pipe front end, avoid being burnt through, and can guarantee spherical surface sealing contact range, prevent air leakage, to improve the service life of air supply device.In addition, since double-cavity cooling mode can obtain strengthened cooling effect, thus cooling cavity area can be reduced moderately, the length of ball head is shortened, so it can meet the use demand of smaller volume blast furnace.

[0015] The double-cavity cooling structure of the utility model can adopt different cooling medium or different cooling mode according to different cooling intensity, meets cooling, sealing and other multiple functions, is flexible and changeable, and is practical.

[0016] The front end of the utility model includes ball head and plugging piece, and the ball head and straight blow pipe body are connected by welding through the plugging piece; compared with the direct welding of ball head and pipe body, the split structure of the utility model greatly reduces processing difficulty, and is beneficial to processing and manufacturing.Plugging piece and ball head are embedded and connected, and then welded, to effectively improve sealing effect. BRIEF DESCRIPTION OF DRAWINGS

[0017] Figure 1 It is the whole structure schematic diagram of the utility model;

[0018] Figure 2This is a schematic diagram of the longitudinal cross-section structure of the front end of the utility model;

[0019] Figure 3 It is a cross-sectional structural diagram of the front end of the utility model.

[0020] In the figure, 1, pipe body, 2, front end head, 2-1, ball head, 2-2, sealing part, 2-2-1, convex ring group, 2-3, inner cooling cavity, 2-4, outer cooling cavity, 2-5, partition, 2-6, water inlet casing, 2-7, return casing, 2-8, welding point, 3, flange, 4, air supply channel, 5, spray gun sleeve, 6, coal supply channel, 7, refractory material. DETAILED DESCRIPTION

[0021] The present invention will be described in detail below with reference to the accompanying drawings.

[0022] A double-cavity cooling type blast furnace direct blowing pipe, such as Figure 1 As shown, it includes a tube body 1 and a front end head 2. The tube body 1 is a conical tube, and its large-diameter end is provided with a flange 3 for connecting to the hot air inlet pipe, and its small-diameter end is fixedly connected to the front end head 2, and an air supply channel 4 is opened axially in the center of the tube body 1. The front end head 2 is fixed to the front end of the tube body 1, and an air outlet that matches the air supply channel 4 is opened in the center of the front end head 2. A spray gun sleeve 5 for spraying fuel is also provided on the tube body 1, and a coal supply channel 6 is provided in the spray gun sleeve 5; the coal supply channel 6 is arranged along the taper of the tube body 1, and the front end of the coal supply channel 6 is connected to the front end of the air supply channel 4. The gaps between the outer shell of the tube body 1 and the air supply channel 4, and between the outer shell of the tube body 1 and the coal supply channel 6 are tightly filled with refractory material 7.

[0023] like Figure 1 、 Figure 2 As shown, the front end head 2 includes a ball head 2-1 that cooperates with the blast furnace tuyere sleeve, and a plugging member 2-2 for connecting the ball head 2-1 and the pipe body 1. The plugging member 2-2 and the pipe body 1, and the plugging member 2-2 and the ball head 2-1 are fixed by welding. The curved portion of the ball head 2-1 cooperates with the tuyere sleeve to form a tight fit and prevent air leakage.

[0024] The ball head 2-1 is provided with an inner cooling cavity 2-3 and an outer cooling cavity 2-4, and the inner cooling cavity 2-3 and the outer cooling cavity 2-4 are coaxially arranged. Figure 3 The ball head 2-1 is also provided with a partition 2-5 for separating the inner cooling chamber 2-3 and the outer cooling chamber 2-4 into a water inlet area and a water outlet area. A water inlet hole and a water return hole are provided on both sides of the partition 2-5, and both the water inlet hole and the water return hole are located close to the partition 2-5. A water inlet sleeve 2-6 is installed at the water inlet hole, and a water return sleeve 2-7 is installed at the water return hole.

[0025] The water inlet sleeve 2-6 includes an inner water inlet pipe in communication with the inner cooling cavity 2-3, and an outer water inlet pipe in communication with the outer cooling cavity 2-4. The inner water inlet pipe and the outer water inlet pipe are coaxially arranged. The inlet end of the inner water inlet pipe is connected to the inner cooling medium input pipe, and the inlet end of the outer water inlet pipe is connected to the outer cooling medium input pipe. The water return sleeve 2-7 includes an inner water return pipe in communication with the inner cooling cavity 2-3, and an outer water return pipe in communication with the outer cooling cavity 2-4. The inner water return pipe and the outer water return pipe are coaxially arranged. The outlet end of the inner water return pipe is connected to the inner cooling medium output pipe, and the outlet end of the outer water return pipe is connected to the outer cooling medium output pipe. The inner water inlet pipe, the inner cooling cavity 2-3, and the inner water return pipe are in communication, forming an inner cooling loop. The outer water inlet pipe, the outer cooling cavity 2-4, and the outer water return pipe are in communication, forming an outer cooling loop.

[0026] It should be noted that although the applicant names the structural components through the water inlet pipe, the water return pipe, the water inlet hole, and the water return hole, in fact, the cooling medium is not limited to cooling water. Other cooling media or gas can be used to enhance the cooling effect in various forms. The cooling forms used include but are not limited to: cooling water is introduced into both the inner cooling loop and the outer cooling loop; or other cooling media are introduced into both the inner cooling loop and the outer cooling loop; or two different cooling media are introduced into the inner cooling loop and the outer cooling loop; or cooling medium is filled into the inner cooling loop for circulating cooling, and the outer cooling pipe is blocked and filled with high-pressure gas for auxiliary sealing and isolation; and the like.

[0027] In order to ensure the sealing between the pipes and reduce the processing and installation difficulty, the inner water inlet pipe and the inner cooling cavity 2-3, and the inner water return pipe and the inner cooling cavity 2-3 are connected by sealing threads and welding. The outer water inlet pipe and the outer cooling cavity 2-4, and the outer water return pipe and the outer cooling cavity 2-4 are connected by welding. After the water inlet sleeve 2-6 and the water return sleeve 2-7 are connected with the front head 2, the sleeves are bent along the slope of the straight blow pipe body 1 to fit the outer wall of the pipe body 1. As shown in Figure 1 In order to facilitate the connection of the equipment pipeline, the inlet ends of the inner water inlet pipe and the outer water inlet pipe are separated, the outlet ends of the inner water return pipe and the outer water return pipe are separated, and the outer sleeve is selected to be welded and blocked with the inner sleeve. After that, the outer cooling medium input pipe / outer cooling medium output pipe in communication with the outer cooling cavity is arranged vertically along the sleeve.

[0028] The inlet end of the water inlet sleeve 2-6 and the outlet end of the water outlet sleeve can be connected with the upstream and downstream pipelines by sealing threads or flanges 3.

[0029] As shown in Figure 2As shown, the sealing member 2-2 is provided with a convex ring set matched with the inner diameter of the inner cooling cavity 2-3 and the outer cooling cavity 2-4 on the side close to the ball head 2-1. The convex ring set comprises an inner convex ring matched with the inner cooling cavity 2-3 and an outer convex ring matched with the outer cooling cavity 2-4. During installation, the convex ring set of the sealing member 2-2 is embedded into the cooling cavity of the ball head 2-1 and then is firmly welded, so that the sealing effect is greatly improved.

[0030] The pipe body 1, the sealing member 2-2 and the ball head 2-1 are all made of steel, and the pipe body is preferably Q235B, and the sealing member and the ball head are preferably 321 or 310S. After the installation of the straight-through pipe is completed, a sealing test needs to be carried out, the test pressure is 1.15*0.6 MPa, and air leakage is not allowed.

[0031] The above only describes the preferred embodiments of the present application, and any changes and modifications made within the scope of the present application should be included in the scope of the present application.

Claims

1. A double-cavity cooling type blast furnace tuyere comprising a tuyere body (1) and a front end head (2) connected to the front end of the tuyere body (1), characterized in that: The front end head (2) comprises a ball head (2-1) and a blocking piece (2-2) for connecting the ball head (2-1) and the pipe body (1), and the two ends of the blocking piece (2-2) are welded to the pipe body (1) and the ball head (2-1) respectively; the arc-shaped part of the ball head (2-1) is matched with the tuyere small sleeve, and an inner cooling cavity (2-3) and an outer cooling cavity (2-4) are arranged in the ball head (2-1), and the inner cooling cavity (2-3) and the outer cooling cavity (2-4) are coaxially arranged.

2. A double-shaft cooled blast furnace tuyere according to claim 1, characterized in that: The inner cooling cavity (2-3) and the outer cooling cavity (2-4) are divided into a water inlet area and a water return area by a partition (2-5), a water inlet hole is arranged in the water inlet area, and a water return hole is arranged in the water return area, a water inlet sleeve (2-6) is arranged at the water inlet hole, and a water return sleeve (2-7) is arranged at the water return hole.

3. A double-shaft cooled blast furnace tuyere according to claim 2, characterized in that: The water inlet hole and the water return hole are arranged close to the partition (2-5).

4. The double-cavity cooling type blast furnace tuyere according to claim 2, characterized in that: The water inlet sleeve (2-6) comprises coaxially arranged inner and outer water inlet pipes, and the water return sleeve (2-7) comprises coaxially arranged inner and outer water return pipes; the inner water inlet pipe, the inner cooling cavity (2-3) and the inner water return pipe are connected in communication to form an inner cooling loop; and the outer water inlet pipe, the outer cooling cavity (2-4) and the outer water return pipe are connected in communication to form an outer cooling loop.

5. A double-shaft cooled blast furnace tuyere according to claim 4, characterized in that: The water inlet sleeve (2-6) and the water return sleeve (2-7) are arranged obliquely along the slope of the pipe body (1).

6. A double-shaft cooled blast furnace tuyere according to claim 4, characterized in that: The inner water inlet pipe and the inner cooling cavity (2-3) are connected by sealing threads and welding, and the inner water return pipe and the inner cooling cavity (2-3) are connected by sealing threads and welding; the outer water inlet pipe and the outer cooling cavity (2-4) are connected by welding, and the outer water return pipe and the outer cooling cavity (2-4) are connected by welding.

7. A double-shaft cooled bustle for a blast furnace according to claim 1, characterized in that: The blocking piece (2-2) is provided with a convex ring group matched with the inner diameter of the inner cooling cavity (2-3) and the outer cooling cavity (2-4) on the side close to the ball head (2-1), and the blocking piece (2-2) and the ball head (2-1) are embeddedly and tightly matched.

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