Hard pipe connecting structure of blast furnace pulverized coal spray gun

Abstract

The utility model relates to the technical field of spray gun pipeline connection, and discloses a blast furnace pulverized coal spray gun hard pipe connecting structure which comprises a pulverized coal spray gun connector, a connecting bent pipe and a coal conveying pipe, the two ends of the connecting bent pipe are each provided with a first connecting mechanism, and the end of the pulverized coal spray gun connector is provided with a second connecting mechanism. A third connecting mechanism is arranged at the end part of the coal conveying pipe; the first connecting mechanism comprises a sleeve connecting piece arranged at the end of the connecting bent pipe in a sleeving mode, a locking nut connected to one side of the sleeve connecting piece in a screwed mode and a sealing piece arranged on the inner circumference of the locking nut. The coal conveying pipe and the pulverized coal spray gun are connected through the hard pipe, and therefore the problem that in the prior art, a metal hose is prone to abrasion in the using process, and pulverized coal leaks out from the damaged position is solved. And meanwhile, parts such as a sleeve connecting piece are added, so that the device can be conveniently disassembled on the existing process facility, and the function of conveying high-temperature pulverized coal through a full-hard pipe is realized.

Description

Technical Field

[0001] The utility model relates to the technical field of spray gun pipeline connection, in particular to a hard pipe connection structure for a blast furnace coal powder spray gun. Background Art

[0002] Pulverized coal injection (PCI) is widely used in modern blast furnace ironmaking. This involves mixing anthracite and bituminous coal, grinding them into a powder, and then injecting them into an injection tank. After pressurization and fluidization, the mixture is injected through pipes and tuyeres into the blast furnace for combustion. This replaces some of the coke, providing both physical heat and a reducing agent, thereby reducing the coke ratio and the cost per ton of iron. Increasing the temperature of the pulverized coal entering the furnace improves its combustion efficiency, thus saving energy and reducing consumption.

[0003] The coal injection lance is a crucial component of the blast furnace's coal injection system. Made of heat-resistant seamless steel pipe, it's typically connected to the coal delivery pipe using a metal hose. However, these hoses can wear out during use, causing pulverized coal to leak from damaged areas. The preheated pulverized coal reaches a temperature of around 300°C, making it highly susceptible to spontaneous combustion if it leaks from the pipe. Therefore, a reliable and easily maintained rigid pipe connection solution was required. Utility Model Content

[0004] The utility model aims to solve the problems existing in the prior art and proposes a hard pipe connection structure for a blast furnace coal powder injection gun.

[0005] In order to achieve the above purpose, the present invention adopts the following technical solutions:

[0006] A blast furnace coal powder injection gun hard pipe connection structure includes a coal powder injection gun interface, a connecting elbow, and a coal conveying pipe. Both ends of the connecting elbow are provided with a first connecting mechanism, the end of the coal powder injection gun interface is provided with a second connecting mechanism, and the end of the coal conveying pipe is provided with a third connecting mechanism.

[0007] The first connecting mechanism includes a sleeve connector sleeved on the end of the connecting elbow, a locking nut screwed on one side of the sleeve connector, and a sealing member arranged on the inner periphery of the locking nut;

[0008] The second connecting mechanism has the same structure as the first connecting mechanism, and the sleeve connecting piece in the second connecting mechanism is sleeved on the outside of the coal conveying pipe;

[0009] The third connecting mechanism includes a coal gun connecting piece inserted on the outside of the coal powder injection gun interface;

[0010] One side of the two sleeve connectors in the first connecting mechanism is spirally connected with a sleeve, and the other ends of the two sleeves are respectively screwed to one side of the sleeve in the second connecting mechanism and one side of the coal gun connector through threads.

[0011] Preferably, the sealing member is a graphite sealing ring, and the locking nut is sealed and fixed to the connecting elbow or coal conveying pipe by squeezing the graphite sealing ring.

[0012] Preferably, the pulverized coal injection gun interface, connecting elbow and coal conveying pipe are all made of high-temperature resistant stainless steel pipe or ceramic composite pipe.

[0013] Preferably, the other end of the pulverized coal injection gun interface is connected to a ball valve or a connecting flange.

[0014] Preferably, the sleeve connector is screwed to the sleeve end via an internal thread, and the sleeve connector is screwed to the inner circumference of the locking nut via an external thread, and the inner diameter of the sleeve is adapted to the outer diameters of the coal conveying pipe and the connecting elbow.

[0015] Preferably, one side of the sealing member abuts against a side of the corresponding sleeve connector.

[0016] Compared with the prior art, the beneficial effects of the present invention are:

[0017] The utility model adopts a hard pipe to connect the coal conveying pipe and the coal powder spray gun, which solves the problem in the prior art that the metal hose is easily worn during use, causing coal powder to leak from the damaged part. At the same time, only by adding parts such as sleeve connectors, the existing process facilities can be easily disassembled to achieve the function of full hard pipe transportation of high-temperature coal powder. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 This is a front view of a hard pipe connection structure for a blast furnace coal powder injection gun proposed by the utility model.

[0019] In the figure: 1, coal powder spray gun interface; 2, connecting elbow; 3, coal conveying pipe; 41, coal gun connecting piece; 42, casing; 43, casing connecting piece; 44, locking nut; 45, graphite sealing ring. DETAILED DESCRIPTION

[0020] The technical solutions in the embodiments of the present invention will be described clearly and completely below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all the embodiments.

[0021] Reference Figure 1 A hard pipe connection structure for a blast furnace pulverized coal injection gun 1 includes a pulverized coal injection gun interface 1, a connecting elbow 2, and a coal conveying pipe 3. Both ends of the connecting elbow 2 are provided with a first connecting mechanism, the end of the pulverized coal injection gun interface 1 is provided with a second connecting mechanism, and the end of the coal conveying pipe 3 is provided with a third connecting mechanism;

[0022] The first connection mechanism includes a sleeve connector 43 sleeved on the end of the connecting elbow 2, a locking nut 44 screwed on one side of the sleeve connector 43, and a sealing member provided on the inner periphery of the locking nut 44;

[0023] The second connecting mechanism has the same structure as the first connecting mechanism, and the sleeve connector 43 in the second connecting mechanism is sleeved on the outside of the coal conveying pipe 3;

[0024] The third connection mechanism includes a coal gun connection piece 41 inserted into the outside of the coal powder injection gun interface 1;

[0025] One side of the two sleeve connectors 43 in the first connection mechanism is screwed with a sleeve 42, and the other ends of the two sleeves 42 are screwed to one side of the sleeve 42 in the second connection mechanism and one side of the coal gun connector 41 respectively.

[0026] When the device is in use, first, the coal powder spray gun interface 1, the coal gun connector 41, the sleeve 42, and the sleeve connector 43 are screwed together in sequence, the graphite sealing ring 45 is installed in the locking nut 44, the locking nut 44 is threadedly connected to the sleeve connector 43, and one end of the connecting elbow 2 is inserted into the sleeve 42 after passing through the locking nut 44 and the sleeve connector 43. The graphite sealing ring 45 is squeezed to achieve sealing and fixation, forming a horizontal adjustment component (i.e. Figure 1 The two sleeve connectors 43 are installed at both ends of the sleeve 42 through threaded connection, and the graphite sealing ring 45 is installed in the locking nut 44. The locking nut 44 is threadedly connected to the sleeve connector 43. The connecting elbow 2 and the coal conveying pipe 3 pass through the locking nuts 44 and the sleeve connector 43 at both ends and are inserted into the sleeve 42. The sealing and fixation are achieved by squeezing the graphite sealing ring 45 to form a vertical adjustment component (i.e. Figure 1 In actual use, the connecting elbow 2 is not necessarily Figure 1 , but both ends of the connecting elbow 2 are connected by the present connection structure. Compared with the prior art, the present device uses a hard pipe to connect the coal conveying pipe 3 and the coal powder spray gun, which solves the problem that the metal hose is easily worn during use, causing coal powder to leak from the damaged part. At the same time, only by adding components such as the sleeve connector 43, the existing process facilities can be easily disassembled and the function of full hard pipe transportation of high-temperature coal powder can be achieved.

[0027] In this embodiment, the sealing member is a graphite sealing ring 45 , and the locking nut 44 is sealed and fixed to the connecting elbow 2 or the coal conveying pipe 3 by squeezing the graphite sealing ring 45 .

[0028] In this embodiment, the pulverized coal injection gun interface 1, the connecting elbow 2 and the coal conveying pipe 3 are all made of high-temperature resistant stainless steel pipes or ceramic composite pipes, using hard pipes and utilizing heat resistance to meet the full hard pipe transportation requirements of high-temperature pulverized coal.

[0029] In this embodiment, the other end of the pulverized coal injection gun interface 1 is connected to a ball valve or a connecting flange, which can be installed according to needs to connect the pulverized coal injection gun interface 1 to the pulverized coal injection gun.

[0030] In this embodiment, the sleeve connector 43 is screwed to the end of the sleeve 42 through an internal thread, and the sleeve connector 43 is screwed to the inner circumference of the locking nut 44 through an external thread. The inner diameter of the sleeve 42 is adapted to the outer diameter of the coal conveying pipe 3 and the connecting elbow 2.

[0031] In this embodiment, one side of the sealing member abuts against the side of the corresponding sleeve connector 43 , which is beneficial to improving the sealing performance of the locking nut 44 and the sleeve connector 43 .

[0032] The above is only a preferred specific implementation method of the present invention, but the protection scope of the present invention is not limited to this. Any technician familiar with the technical field within the technical scope disclosed by the present invention can make equivalent replacements or changes based on the technical solution and utility model concept of the present invention, which should be covered by the protection scope of the present invention.

Claims

1. A blast furnace coal powder injection gun hard pipe connection structure, including a coal powder injection gun interface, a connecting elbow and a coal conveying pipe, characterized in that: Both ends of the connecting elbow are provided with a first connecting mechanism, the end of the coal powder injection gun interface is provided with a second connecting mechanism, and the end of the coal conveying pipe is provided with a third connecting mechanism; The first connecting mechanism includes a sleeve connector sleeved on the end of the connecting elbow, a locking nut screwed on one side of the sleeve connector, and a sealing member arranged on the inner periphery of the locking nut; The second connecting mechanism has the same structure as the first connecting mechanism, and the sleeve connecting piece in the second connecting mechanism is sleeved on the outside of the coal conveying pipe; The third connecting mechanism includes a coal gun connecting piece inserted on the outside of the coal powder injection gun interface; One side of the two sleeve connectors in the first connecting mechanism is spirally connected with a sleeve, and the other ends of the two sleeves are respectively screwed to one side of the sleeve in the second connecting mechanism and one side of the coal gun connector through threads.

2. The rigid pipe connection structure for a blast furnace coal powder injection gun according to claim 1, characterized in that: The sealing member is a graphite sealing ring, and the locking nut is sealed and fixed to the connecting elbow or coal conveying pipe by squeezing the graphite sealing ring.

3. The rigid pipe connection structure for a blast furnace coal powder injection gun according to claim 1, characterized in that: The pulverized coal spray gun interface, connecting elbow and coal conveying pipe are all made of high-temperature resistant stainless steel pipe or ceramic composite pipe.

4. The rigid pipe connection structure for a blast furnace coal powder injection gun according to claim 2, characterized in that: The other end of the pulverized coal injection gun interface is connected to a ball valve or a connecting flange.

5. The rigid pipe connection structure for a blast furnace coal powder injection gun according to claim 1, characterized in that: The sleeve connector is screwed to the sleeve end via an internal thread, and is screwed to the inner circumference of a locking nut via an external thread. The inner diameter of the sleeve is adapted to the outer diameters of the coal conveying pipe and the connecting elbow.

6. The rigid pipe connection structure for a blast furnace coal powder injection gun according to claim 1, characterized in that: One side of the sealing member abuts against a side of the corresponding sleeve connector.

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