Uniform pulverized coal injection device for blast furnace

Abstract

The utility model discloses a blast furnace pulverized coal uniform injection device which comprises a blast furnace body, the bottom of the outer surface of the blast furnace body is fixedly connected with a spray gun mechanism in a penetrating mode, the top of the spray gun mechanism is communicated with an annular air pipe, the left side of the annular air pipe is communicated with a fixed air pipe, and the left side of the fixed air pipe is communicated with a pulverized coal conveying pipe. The top of the pulverized coal conveying pipe is sleeved with an upper heating cover, positioning mechanisms are connected to the four corners of the upper heating cover through bolts, inserting plates are inserted into inner cavities of the positioning mechanisms, and positioning grooves are formed in the opposite sides of the left inserting plate and the right inserting plate. Through the cooperative use of the annular air pipe, the electromagnetic valve, the air flow sensor, the mounting box and the spray gun body, the coal injection device has the advantages of intelligent control of flow velocity and more uniform coal injection, can detect the flow velocity of gas in the coal injection pipe in real time, intelligently controls the opening degree of the electromagnetic valve, and ensures that the flow velocity in each spray pipe is the same and uniform coal injection is realized.

Description

Technical Field

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

[0002] Blast furnace coal injection mainly consists of coal storage and transportation, coal powder preparation, coal powder transportation, coal powder injection, dry gas preparation and gas supply power system. Blast furnace coal powder injection is to directly spray ground anthracite powder or bituminous coal powder or a mixture of the two into the furnace from the blast furnace tuyere to replace coke to provide heat and reduce the coke ratio and reduce the cost of pig iron.

[0003] The utility model patent with patent application publication number CN214458108U discloses a new type of blast furnace coal powder uniform injection energy-saving device. It includes a furnace body and a main powder delivery pipe, the main powder delivery pipe is connected to a distributor and a plurality of branch powder delivery pipes, one end of the branch powder delivery pipe is connected to a spray gun, and an adjustment device is provided on the end of the branch powder delivery pipe close to the spray gun. The adjustment device includes a shell and a lifting member slidably connected thereto. The shell is hollow inside and a powder outlet and a powder inlet are provided at both ends respectively. A first through channel is provided above the hollow inside the shell, and a second through channel is provided below, and a concave platform is provided above the second channel; a boss is provided on the bottom surface of the lifting member, and the boss is slidably connected to the first channel, and vertical plates are provided on both sides of the lifting member, and a horizontal plate is provided at the lower part of the vertical plate, and a column is provided on the horizontal plate, and a blocking plate is provided above the column, and the lower part of the blocking plate is slidably connected to the concave platform. The utility model can make the sprayed coal powder distributed more evenly in the blast furnace.

[0004] However, the above device still has some shortcomings in actual use. The most obvious one is that the intelligence level is low. The above coal injection device is mechanically connected, which will lead to errors in injecting coal into the blast furnace, and the coal injection uniformity is not good. Moreover, it has no preheating function and cannot preheat the coal powder. As a result, after the coal powder with lower temperature is introduced into the furnace, part of the furnace temperature will be lost to heat it.

[0005] Therefore, it is necessary to invent a blast furnace pulverized coal uniform injection device to solve the above problems. Utility Model Content

[0006] The purpose of the utility model is to provide a blast furnace coal powder uniform injection device, which has the advantages of higher intelligence, can accurately detect the flow rate and air it, more uniform coal injection, and has a preheating function to ensure that the temperature in the furnace will not be lost. It solves the problem of low intelligence, inability to detect and control the flow rate at all times, poor coal injection effect, and lack of preheating function, which leads to temperature loss in the furnace.

[0007] To achieve the above-mentioned purpose, the utility model provides the following technical solutions: a blast furnace coal powder uniform injection device, comprising a blast furnace body, a spray gun mechanism is fixedly connected to the bottom of the outer surface of the blast furnace body, the top of the spray gun mechanism is connected to an annular air duct, the left side of the annular air duct is connected to a fixed air duct, the left side of the fixed air duct is connected to a coal powder conveying pipe, the top of the coal powder conveying pipe is sleeved with an upper heating cover, the four corners of the upper heating cover are connected to a positioning mechanism by bolts, the inner cavity of the positioning mechanism is plugged with a plug-in plate, and positioning grooves are provided on the opposite sides of the left and right plug-in plates, the top of the plug-in plate is connected to a lower heating cover by bolts, and the inner cavities of the lower heating cover and the upper heating cover are both connected to heaters by bolts.

[0008] Preferably, limit plates are welded to both left and right sides of the top and bottom of the pulverized coal conveying pipe, and limit openings are provided on opposite sides of the upper heating hood and the lower heating hood.

[0009] Preferably, the spray gun mechanism includes an installation box, the inner cavity of the installation box is penetrated by an air flow sensor fixedly connected, the bottom of the installation box is connected to the spray gun body, the side of the spray gun body away from the installation box penetrates to the inner cavity of the blast furnace body and is connected to a spray cover, the top of the installation box is connected to an installation air duct, and the surface of the installation air duct is sleeved with a solenoid valve.

[0010] Preferably, the positioning mechanism includes a plug-in shell, a positioning shell is fused to the side of the plug-in shell away from the upper heating cover, the inner cavity of the positioning shell is slidably connected with a connecting slide, the side of the connecting slide away from the plug-in shell is respectively fixedly connected with a pull rod and a positioning spring, a side of the connecting slide away from the pull rod is fused with a positioning plug plate, and the side of the positioning plug plate away from the connecting slide passes through the plug-in shell and extends to the inner cavity of the positioning groove.

[0011] Preferably, a chamfer is provided on a side of the positioning plug plate away from the connecting slide plate, and a side of the pull rod away from the connecting slide plate penetrates to the outside of the positioning shell and is fixedly connected to the pull plate.

[0012] Preferably, the number of the spray gun mechanisms is six and they are evenly distributed on the outer surface of the blast furnace body; the upper heating hood and the lower heating hood are both made of metal plates, and the surface is covered with thermal insulation asbestos felt material.

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

[0014] 1. The utility model, through the coordinated use of an annular air duct, a solenoid valve, an air flow sensor, a mounting box and a spray gun body, has the advantages of intelligently controlling the flow rate and making coal spraying more uniform. It can detect the gas flow rate in the coal spraying pipe in real time, and intelligently control the opening size of the solenoid valve to ensure that the flow rate in each spraying pipe is the same and the coal spraying is uniform.

[0015] 2. The utility model has the advantages of preheating and convenient disassembly and assembly of the preheating device through the coordinated use of the upper heating cover, the lower heating cover, the plug-in board, the heater, the positioning groove and the positioning mechanism, and can prevent the pulverized coal with a lower temperature from entering the furnace and absorbing part of the heat to heat it, thereby avoiding heat loss in the furnace. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 It is an axonometric drawing of the structure of the utility model;

[0017] Figure 2 It is an axonometric diagram of the spray gun mechanism of the utility model;

[0018] Figure 3 It is a left axonometric view of the local structure of the utility model;

[0019] Figure 4 It is a top axonometric view of the lower heating cover of the utility model;

[0020] Figure 5 This is a bottom-up axonometric view of the upper heating cover of the utility model;

[0021] Figure 6 For this utility model Figure 5 A is an enlarged view of the middle image.

[0022] In the figure: 1 blast furnace body, 2 annular air duct, 3 spray gun mechanism, 4 fixed air duct, 5 upper heating cover, 6 pulverized coal conveying pipe, 7 lower heating cover, 8 solenoid valve, 9 installation air duct, 10 air flow sensor, 11 installation box, 12 spray cover shell, 13 spray gun body, 14 limit plate, 15 plug-in board, 16 heater, 17 positioning groove, 18 limit opening, 19 positioning mechanism, 20 plug-in shell, 21 connecting slide plate, 22 positioning spring, 23 pull rod, 24 positioning shell, 25 positioning plug-in plate. DETAILED DESCRIPTION

[0023] See also Figure 1-Figure 6 A blast furnace pulverized coal uniform injection device, comprising a blast furnace body 1, a lance mechanism 3 is fixedly connected to the bottom of the outer surface of the blast furnace body 1, the top of the lance mechanism 3 is connected to an annular air duct 2, the left side of the annular air duct 2 is connected to a fixed air duct 4, the left side of the fixed air duct 4 is connected to a pulverized coal conveying pipe 6, an upper heating cover 5 is sleeved on the top of the pulverized coal conveying pipe 6, the four corners of the upper heating cover 5 are connected to a positioning mechanism 19 by bolts, the inner cavity of the positioning mechanism 19 is plugged with a plug-in board 15, the opposite sides of the left and right plug-in boards 15 are provided with positioning grooves 17, the top of the plug-in board 15 is connected to a lower heating cover 7 by bolts, and the inner cavities of the lower heating cover 7 and the upper heating cover 5 are both connected to heaters 16 by bolts;

[0024] The left and right sides of the top and bottom of the pulverized coal conveying pipe 6 are welded with limit plates 14, and the upper heating cover 5 and the lower heating cover 7 are provided with limit openings 18 on the opposite sides. By setting the limit plates 14 and the limit openings 18, the function of limiting and preventing loosening is provided, which solves the problem that the upper heating cover 5 and the lower heating cover 7 will move on the surface of the pulverized coal conveying pipe 6 when connected;

[0025] The spray gun mechanism 3 includes an installation box 11, the inner cavity of the installation box 11 penetrates and is fixedly connected with an air flow sensor 10, the bottom of the installation box 11 is connected with a spray gun body 13, the side of the spray gun body 13 away from the installation box 11 penetrates to the inner cavity of the blast furnace body 1 and is connected with a spray cover 12, the top of the installation box 11 is connected with an installation air duct 9, and the surface of the installation air duct 9 is sleeved and connected with an electromagnetic valve 8. By setting the installation box 11, the function of installation and fixing is provided, which solves the problem that the air flow sensor 10 cannot be installed and fixed;

[0026] The positioning mechanism 19 includes a plug-in shell 20, a positioning shell 24 is welded to the side of the plug-in shell 20 away from the upper heating cover 5, a connecting slide 21 is slidably connected to the inner cavity of the positioning shell 24, a pull rod 23 and a positioning spring 22 are respectively fixedly connected to the side of the connecting slide 21 away from the plug-in shell 20, a positioning plug 25 is welded to the side of the connecting slide 21 away from the pull rod 23, and the side of the positioning plug 25 away from the connecting slide 21 penetrates the plug-in shell 20 and extends to the inner cavity of the positioning groove 17;

[0027] The side of the positioning plug plate 25 away from the connecting slide plate 21 is chamfered, and the side of the pull rod 23 away from the connecting slide plate 21 penetrates the outer side of the positioning shell 24 and is fixedly connected with a pull plate. By setting the pull plate, it is convenient to pull the pull rod 23, which solves the problem of relatively laborious pulling of the pull rod 23.

[0028] There are six spray gun mechanisms 3, which are evenly distributed on the outer surface of the blast furnace body 1. The upper heating hood 5 and the lower heating hood 7 are both made of metal plates, and the surface is covered with insulating asbestos felt material. By setting the insulating asbestos felt, it has the function of heat insulation and solves the problem of temperature loss in the upper heating hood 5 and the lower heating hood 7.

[0029] When in use, the device is connected to an external power supply and a controller to control the heaters 16 in the upper heating cover 5 and the lower heating cover 7 to work. The heater 16 heats the coal powder conveying pipe 6 in the middle. At this time, the compressed air blows the coal powder into the coal powder conveying pipe 6. The heated coal powder conveying pipe 6 can preheat the coal powder flowing inside. The preheated coal powder flows into the annular air duct 2 through the fixed air duct 4, and then is sprayed into the interior of the blast furnace body 1 through each spray gun body 13. When the coal powder flows through the installation box 11, the air flow inside the installation box 11 The flow sensor 10 can detect the flow rate. After the air flow sensor 10 detects that the flow rate in an installation box 11 is reduced, it transmits the signal to the external processor, and then the processor controls the solenoid valve 8 to increase the opening and increase the air intake. This can ensure that the flow rate in each installation box 11 is the same, so that the coal powder sprayed from each spray gun body 13 is more uniform and the combustion effect is better. At the same time, the coal powder is preheated to prevent the coal powder with lower temperature from entering the blast furnace body 1 and then heating it first, thereby avoiding temperature loss in the blast furnace body 1.

[0030] To sum up: the blast furnace coal powder uniform injection device, through the coordinated use of the annular air duct 2, the solenoid valve 8, the air flow sensor 10, the installation box 11, the spray gun body 13, the upper heating cover 5, the lower heating cover 7, the plug-in board 15, the heater 16, the positioning groove 17 and the positioning mechanism 19, solves the problems of low intelligence, inability to detect and control the flow rate at all times, poor coal injection effect, lack of preheating function, and resulting in temperature loss in the furnace.

Claims

1. A blast furnace coal powder uniform injection device, comprising a blast furnace body (1), characterized in that: A spray gun mechanism (3) is fixedly connected to the bottom of the outer surface of the blast furnace body (1), the top of the spray gun mechanism (3) is connected to an annular air duct (2), the left side of the annular air duct (2) is connected to a fixed air duct (4), the left side of the fixed air duct (4) is connected to a coal powder conveying pipe (6), the top of the coal powder conveying pipe (6) is sleeved with an upper heating cover (5), the four corners of the upper heating cover (5) are connected to a positioning mechanism (19) by bolts, the inner cavity of the positioning mechanism (19) is plugged with a plug-in board (15), and the opposite sides of the left and right plug-in boards (15) are provided with positioning grooves (17), the top of the plug-in board (15) is connected to a lower heating cover (7) by bolts, and the inner cavities of the lower heating cover (7) and the upper heating cover (5) are connected to heaters (16) by bolts.

2. A blast furnace coal powder uniform injection device according to claim 1, characterized in that: Limiting plates (14) are welded to the left and right sides of the top and bottom of the pulverized coal conveying pipe (6), and limiting openings (18) are provided on the opposite sides of the upper heating cover (5) and the lower heating cover (7).

3. The blast furnace coal powder uniform injection device according to claim 1, characterized in that: The spray gun mechanism (3) comprises an installation box (11), the inner cavity of the installation box (11) is penetrated and fixedly connected with an air flow sensor (10), the bottom of the installation box (11) is connected with a spray gun body (13), the side of the spray gun body (13) away from the installation box (11) penetrates to the inner cavity of the blast furnace body (1) and is connected with a spray cover (12), the top of the installation box (11) is connected with an installation air duct (9), and the surface of the installation air duct (9) is sleeved with a solenoid valve (8).

4. The blast furnace coal powder uniform injection device according to claim 1, characterized in that: The positioning mechanism (19) comprises a plug-in shell (20), a positioning shell (24) is welded to the side of the plug-in shell (20) away from the upper heating cover (5), the inner cavity of the positioning shell (24) is slidably connected to a connecting slide (21), the side of the connecting slide (21) away from the plug-in shell (20) is respectively fixedly connected to a pull rod (23) and a positioning spring (22), the side of the connecting slide (21) away from the pull rod (23) is welded to a positioning plug plate (25), and the side of the positioning plug plate (25) away from the connecting slide (21) passes through the plug-in shell (20) and extends to the inner cavity of the positioning groove (17).

5. A blast furnace coal powder uniform injection device according to claim 4, characterized in that: The side of the positioning plug plate (25) away from the connecting slide plate (21) is chamfered, and the side of the pull rod (23) away from the connecting slide plate (21) penetrates to the outside of the positioning shell (24) and is fixedly connected to the pull plate.

6. The blast furnace coal powder uniform injection device according to claim 1, characterized in that: The number of the spray gun mechanisms (3) is six and they are evenly distributed on the outer surface of the blast furnace body (1); the upper heating cover (5) and the lower heating cover (7) are both made of metal plates and the surfaces are covered with thermal insulation asbestos felt material.

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