Blast furnace coal injection gun

Abstract

The utility model relates to the technical field of coal injection guns, and mainly discloses a blast furnace coal injection gun which comprises a first feeding pipe, a second feeding pipe, an air inlet pipe, a first valve and a second valve, the outer wall of one end of the first feeding pipe is sleeved with the second feeding pipe in a sliding mode, and the other end of the first feeding pipe is vertically communicated with the air inlet pipe. The surface of one end of the first feeding pipe is sleeved with the air inlet pipe in a sliding mode, a first valve is arranged on the air inlet pipe, a second valve is arranged at the other end of the first feeding pipe, an air cylinder is arranged on the air inlet pipe, and an ejector rod of the air cylinder is connected with the second feeding pipe. The length of the whole equipment can be freely and automatically adjusted through the air cylinder according to needs, then pulverized coal is conveyed to a target area in a blast furnace, the pulverized coal conveying accuracy of the equipment is improved, and waste of pulverized coal raw materials is avoided; and a plurality of water storage grooves are formed in the pipe wall of the second feeding pipe and communicate with the water tank through switching blocks, cooling liquid is pumped into the water storage grooves through the water tank, the temperature of the second feeding pipe is absorbed, the second feeding pipe is prevented from being heated and deformed, and the service life of the equipment is prolonged.

Description

Technical Field

[0001] The utility model relates to the technical field of coal injection guns, in particular to a blast furnace coal injection gun. Background Art

[0002] The blast furnace coal injection gun is a kind of equipment used in the ironmaking process. In order to reduce the amount of high-priced coke used in smelting, the blast furnace coal injection process is often used, that is, low-priced coal powder is injected into the furnace through a coal gun inserted into the tuyere to replace the coke combustion. The blast furnace coal injection technology is currently used by most blast furnaces at home and abroad. It is one of the most effective means to reduce the production cost of ironmaking and improve production efficiency to the greatest extent. The process of blast furnace coal injection is divided into coal powder preparation and coal powder transportation. Finally, the coal powder is sent into the blast furnace by the coal injection gun to increase the combustion temperature and reduction performance inside the blast furnace, thereby promoting the reduction reaction of iron.

[0003] In the prior art, Chinese utility model patent CN220300756U discloses a blast furnace coal injection gun, which includes a body, a first ball valve, a three-way connector, a second ball valve, a dredging pipe and an air compressor. By setting the dredging pipe, compressed air is blown into the body when blocked, thereby achieving the dredging of the coal injection gun, avoiding the coal injection gun from being burned by high-temperature and high-pressure hot air. However, the length of the body extending into the blast furnace is not adjustable, and the coal powder cannot be sprayed into the target area inside the blast furnace according to the specifications of the blast furnace, resulting in low utilization rate of the coal powder. Therefore, it is urgent to design an adjustable blast furnace coal injection gun. Utility Model Content

[0004] The utility model aims to provide a blast furnace coal injection gun to solve the disadvantage that the coal powder cannot be injected into the target area inside the blast furnace according to the specifications of the blast furnace in the prior art, resulting in low utilization rate of the coal powder.

[0005] To achieve the above-mentioned purpose, the technical solution of the utility model is a blast furnace coal injection gun, comprising a first feed pipe, a second feed pipe, an air intake pipe, a first valve and a second valve, the outer wall of one end of the first feed pipe is slidably sleeved with the second feed pipe, the other end of the first feed pipe is vertically connected with the air intake pipe, the first valve is arranged on the air intake pipe, and the second valve is arranged on the other end of the first feed pipe, the first valve controls the opening and closing of the air intake pipe, and the second valve controls the opening and closing of the other end of the first feed pipe, the first valve is used to control the compressed air inlet and outlet of the air intake pipe, and the second valve is used to control the circulation of coal powder, the air intake pipe is provided with a cylinder, and the top rod of the cylinder is connected to the second feed pipe. The technical solution sets the second feed pipe to be slidably sleeved on the surface of one end of the first feed pipe, so that the length of the entire equipment can be automatically adjusted as needed through the cylinder, and then the coal powder is delivered to the target area in the blast furnace, thereby improving the accuracy of coal powder transportation by the equipment and avoiding the waste of coal powder raw materials.

[0006] A further solution of the utility model is that a scraper with an annular structure is provided at one end of the first feed pipe located inside the second feed pipe. The scraper is arranged in the technical solution to abut against the inner wall of the second feed pipe. The scraper is made of high temperature resistant and wear-resistant materials. When the second feed pipe is unblocked, the scraper can scrape off the coal powder adhered to the inner wall of the second feed pipe as the second feed pipe slides back and forth, thereby further improving the utilization rate of the coal powder by the equipment and avoiding waste of coal powder.

[0007] A further solution of the utility model is that a plurality of water storage tanks are provided in the tube wall of the second feed pipe, one end of the water storage tanks is an open structure, a transfer block is sealed at the open portion of each water storage tank, each of the transfer blocks is provided with two water pipes penetrating the transfer block, one of the two water pipes serves as an inlet pipe for the coolant, and the other of the two water pipes serves as an outlet pipe for the coolant circulation, and coolant can be pumped into the water storage tank from the outside to absorb the temperature of the second feed pipe itself, thereby avoiding its deformation due to heat and improving the service life of the equipment.

[0008] A further solution of the utility model is that a water tank is also sleeved on the first feed pipe, and an annular cavity is arranged in the water tank. A cooling device is arranged in the annular cavity of the water tank, and the cooling device can be a refrigeration plate, which is electrically connected to an external power supply. The annular cavity is used to store coolant, and the two water pipes of the adapter block pass through one end face of the water tank and are sealed and connected. A plurality of water pumps are installed in the annular cavity, and the water outlet ends of the plurality of water pumps are connected to the liquid inlet pipes of the plurality of adapter blocks, and the liquid outlet pipes of the plurality of adapter blocks are connected to the annular cavity. By setting up an adapter block, the water tank can be used for connection with the water storage tank of the second feed pipe, and at the same time, the coolant in the water tank is pumped into the water storage cavity by the water pump, and then flows out from the liquid outlet pipe of the adapter block into the water tank, thereby improving the cooling efficiency of the second feed pipe, so that the coolant always keeps a low temperature, and avoids affecting the heat dissipation of the second feed pipe.

[0009] A further solution of the utility model is that the water tank is of a hollow structure, and a plurality of flanges consistent with the length direction of the water tank are arranged on the hollow inner surface of the water tank, and a plurality of slide grooves matched with the flanges are opened on the outer surface of the first feed pipe. The flange of the water tank slides along the slide groove of the first feed pipe to achieve synchronous sliding of the water tank and the second feed pipe, and the stability of the sliding connection is improved.

[0010] A further solution of the utility model is that the cylinder is arranged on one side of the first valve, and the top rod of the cylinder is fixedly connected to the water tank.

[0011] A further solution of the utility model is that the cross-section of the water storage tank is arc-shaped, and the number of the water storage tanks is set to three.

[0012] A further solution of the utility model is that the first valve and the second valve are both ball valves.

[0013] Compared with the prior art, the beneficial effects of the utility model are:

[0014] The utility model provides a blast furnace coal injection gun, which can adjust the length of the whole equipment as needed by arranging a second feed pipe to be slidably sleeved on the surface of one end of the first feed pipe, so that the coal powder can be delivered to the target area in the blast furnace, thereby improving the accuracy of coal powder transportation of the equipment and avoiding the waste of coal powder raw materials. At the same time, a plurality of water storage chambers are provided in the wall of the second feed pipe to store cooling liquid, absorb the temperature of the second feed pipe itself, avoid its deformation due to heat, and improve the service life of the equipment. A scraper is provided, and when the second feed pipe is unblocked, as the second feed pipe slides back and forth, the scraper can scrape off the coal powder adhered to the inner wall of the second feed pipe, thereby further improving the utilization rate of the coal powder by the equipment and avoiding the waste of coal powder. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] In order to more clearly illustrate the embodiments of the utility model or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the utility model. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0016] Figure 1 This is a schematic diagram of the structure of a blast furnace coal injection gun proposed by the utility model;

[0017] Figure 2 It is a partial cross-sectional structural schematic diagram of a blast furnace coal injection gun proposed by the utility model;

[0018] Figure 3 This is a schematic diagram of the disassembled structure of a cooling mechanism of a blast furnace coal injection gun proposed by the utility model;

[0019] Figure 4 The utility model is a schematic diagram of the internal structure of a water tank of a blast furnace coal injection gun.

[0020] In the figure: 1. first feed pipe; 2. water tank; 3. second feed pipe; 4. air intake pipe; 5. first valve; 6. second valve; 7. cylinder; 8. slide; 9. water pump; 10. water storage tank; 11. adapter block; 12. scraper; 13. annular cavity; 14. convex rafter. DETAILED DESCRIPTION

[0021] 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.

[0022] Example 1

[0023] like Figure 1-2 As shown, a blast furnace coal injection gun includes a first feed pipe 1, a second feed pipe 3, an air intake pipe 4, a first valve 5 and a second valve 6. The second feed pipe 3 is slidably sleeved on the outer wall of one end of the first feed pipe 1, and the air intake pipe 4 is vertically connected on the other end of the first feed pipe 1. The air intake pipe 4 is provided with a first valve 5, and the second valve 6 is provided on the other end of the first feed pipe 1. The first valve 5 and the second valve 6 are both ball valves. The first valve 5 controls the opening and closing of the air intake pipe 4, and the second valve 6 controls the opening and closing of the other end of the first feed pipe 1. The first valve 5 is set to control the compressed air inlet and outlet of the air intake pipe 4, and the second valve 6 is set to control the circulation of coal powder. The air intake pipe 4 is provided with a cylinder 7, and the top rod of the cylinder 7 is connected to the second feed pipe 3. The technical solution sets the second feed pipe 3 to be slidably sleeved on the surface of one end of the first feed pipe 1, so that the length of the entire equipment can be automatically adjusted as needed through the cylinder 7, and the coal powder can be delivered to the target area in the blast furnace, thereby improving the accuracy of the equipment in conveying coal powder and avoiding the waste of coal powder raw materials.

[0024] A scraper bar 12 with an annular structure is provided at one end of the first feed pipe 1 located inside the second feed pipe 3. The scraper bar 12 is arranged in the technical solution to abut against the inner wall of the second feed pipe 3. The scraper bar 12 is made of high temperature resistant and wear-resistant materials. When the second feed pipe 3 is unblocked, as the second feed pipe 3 slides back and forth, the scraper bar 12 can scrape off the coal powder adhered to the inner wall of the second feed pipe 3, thereby further improving the utilization rate of the coal powder by the equipment and avoiding waste of coal powder.

[0025] Example 2

[0026] This embodiment is based on the implementation of embodiment 1, and the further technical solution is:

[0027] like Figure 3-4As shown, a plurality of water storage tanks 10 are provided in the wall of the second feed pipe 3, and the cross section of the water storage tanks 10 is arc-shaped. Preferably, the number of the water storage tanks 10 is set to three. One end of the plurality of water storage tanks 10 is an open structure, and a transfer block 11 is sealed at the open portion of each water storage tank 10. Two water pipes that penetrate the transfer block 11 are provided on each of the transfer blocks 11, and one of the two water pipes serves as a liquid inlet pipe for the coolant, and the other of the two water pipes serves as a liquid outlet pipe for the coolant circulation. The coolant can be pumped into the water storage tank 10 from the outside to absorb the temperature of the second feed pipe 3 itself, thereby preventing it from being deformed by heat and improving the service life of the equipment.

[0028] A water tank 2 is also sleeved on the first feed pipe 1, and an annular cavity 13 is arranged in the water tank 2. A cooling device is arranged in the annular cavity 13 of the water tank 2, which can be a refrigeration plate, which is electrically connected to an external power supply. The annular cavity 13 is used to store coolant. The two water pipes of the adapter block 11 pass through one end face of the water tank 2 and are sealed and connected. A plurality of water pumps are installed in the annular cavity 13, and the water outlet ends of the plurality of water pumps are connected to the liquid inlet pipes of the plurality of adapter blocks 11. The liquid outlet pipes of the plurality of adapter blocks 11 are connected to the annular cavity 13. The adapter block 11 can be used to connect the water tank 2 with the water storage tank 10 of the second feed pipe 3. At the same time, the coolant in the water tank 2 is pumped into the water storage cavity by the water pump, and then flows out from the liquid outlet pipe of the adapter block 11 into the water tank 2, thereby improving the cooling efficiency of the second feed pipe 3, so that the coolant always maintains a low temperature, and avoids affecting the heat dissipation of the second feed pipe 3.

[0029] A further solution of the utility model is that the water tank 2 is of a hollow structure, and a plurality of flanges 14 consistent with the length direction of the water tank 2 are arranged on the hollow inner surface of the water tank 2, and a plurality of slide grooves 8 compatible with the flanges 14 are opened on the outer surface of the first feed pipe 1. The flange 14 of the water tank 2 slides along the slide grooves 8 of the first feed pipe 1 to achieve synchronous sliding of the water tank 2 and the second feed pipe 3, and improve the stability of the sliding connection. The cylinder 7 is arranged on one side of the first valve 5, and the top rod of the cylinder 7 is fixedly connected to the water tank 2.

[0030] How it works:

[0031] According to the above embodiment, during installation, the water tank 2 is driven by the cylinder 7 to slide along the surface of the first feed pipe 1, and then the second feed pipe 3 is driven to be inserted into different positions in the blast furnace until the pulverized coal can be pumped to the target area, and then the second feed pipe 3 is fixed, and the second valve 6 is opened to connect with the pulverized coal supply device through the first feed pipe 1, and the pulverized coal is delivered to the second feed pipe 3;

[0032] When the second feed pipe 3 is affected by the high temperature in the blast furnace and the coal powder in the pipe is burned and blocked, the second valve 6 is closed and the first valve 5 is opened. Compressed air is pumped into the equipment through the air intake pipe 4 to clear the pipe and release the restriction of the second feed pipe 3. The air cylinder 7 is started to drive the second feed pipe 3 to slide, so that the scraper 12 can remove the coal powder adhered to the inner wall of the second feed pipe 3. Combined with compressed air, the equipment can better clear the blockage and make better use of the coal powder.

[0033] A plurality of water storage chambers are provided in the wall of the second feed pipe 3 for storing coolant, absorbing the temperature of the second feed pipe 3 itself, avoiding its deformation due to heat, and improving the service life of the equipment. The coolant in the water tank 2 is pumped into the water storage chamber by a water pump, and then flows out from another water pipe of the adapter block 11 into the water tank 2, thereby improving the cooling efficiency of the second feed pipe 3. A cooling device (such as a refrigeration plate) can be provided in the water tank 2 to keep the coolant at a low temperature at all times.

[0034] It is obvious to those skilled in the art that the present invention is not limited to the details of the exemplary embodiments described above, and that the present invention can be implemented in other specific forms without departing from the spirit or essential features of the present invention. Therefore, the embodiments should be regarded as exemplary and non-restrictive from any point of view, and the scope of the present invention is defined by the appended claims rather than the above description, and it is intended that all changes falling within the meaning and scope of the equivalent elements of the claims be included in the present invention. Any reference numeral in a claim should not be regarded as limiting the claim to which it relates.

Claims

1. A blast furnace coal injection gun, characterized in that: The invention comprises a first feed pipe (1), a second feed pipe (3), an air intake pipe (4), a first valve (5) and a second valve (6); the second feed pipe (3) is slidably sleeved on the outer wall of one end of the first feed pipe (1); the other end of the first feed pipe (1) is vertically connected to the air intake pipe (4); the first valve (5) is arranged on the air intake pipe (4); the second valve (6) is arranged on the other end of the first feed pipe (1); the first valve (5) controls the opening and closing of the air intake pipe (4); the second valve (6) controls the opening and closing of the other end of the first feed pipe (1); the air intake pipe (4) is arranged on a cylinder (7); the top rod of the cylinder (7) is connected to the second feed pipe (3).

2. A blast furnace coal injection gun according to claim 1, characterized in that: A scraper strip (12) having an annular structure is provided at one end of the first feed pipe (1) located inside the second feed pipe (3), and the scraper strip (12) abuts against the inner wall of the second feed pipe (3).

3. A blast furnace coal injection gun according to any one of claims 1-2, characterized in that: A plurality of water storage tanks (10) are provided in the wall of the second feed pipe (3), one end of the water storage tanks (10) is an open structure, a transfer block (11) is sealed at the open end of each water storage tank (10), and each transfer block (11) is provided with a liquid inlet pipe and a liquid outlet pipe that penetrate the transfer block (11).

4. A blast furnace coal injection gun according to claim 3, characterized in that: The first feed pipe (1) is also sleeved with a water tank (2), an annular cavity (13) is arranged in the water tank (2), the liquid inlet pipe and the liquid outlet pipe of the adapter block (11) penetrate one end surface of the water tank (2) and are sealed, a plurality of water pumps are installed in the annular cavity (13), the water outlet ends of the plurality of water pumps are connected to the liquid inlet pipe, and the plurality of liquid outlet pipes are connected to the annular cavity (13).

5. A blast furnace coal injection gun according to claim 4, characterized in that: The water tank (2) is of a hollow structure, and a plurality of flanges (14) are arranged on the hollow inner surface of the water tank (2) in the same length direction as the water tank (2). A plurality of slide grooves (8) matching the flanges (14) are arranged on the outer surface of the first feed pipe (1), and the flanges (14) are slidably connected and matched with the slide grooves (8).

6. A blast furnace coal injection gun according to claim 5, characterized in that: The cylinder (7) is arranged on one side of the first valve (5), and the top rod of the cylinder (7) is fixedly connected to the water tank (2).

7. A blast furnace coal injection gun according to any one of claims 3 to 6, characterized in that: The cross section of the water storage tank (10) is arc-shaped, and the number of the water storage tanks (10) is set to three.

8. The blast furnace coal injection gun according to claim 1, characterized in that: The first valve (5) and the second valve (6) are both ball valves.

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