Coal injection gun of iron-making blast furnace

Abstract

The utility model belongs to the field of ironmaking equipment, and relates to an ironmaking blast furnace coal injection gun which comprises a main pipe frame, one end of the main pipe frame is communicated with the gas outlet end of a high-pressure gas pump, the gas inlet end of the high-pressure gas pump is communicated with combustible gas, spiral blades are arranged on the inner wall of the main pipe frame, and the outer wall of the main pipe frame is communicated with a coal feeding pipe. The coal feeding pipe is arranged far away from the high-pressure air pump, the end, far away from the high-pressure air pump, of the main pipe frame is connected with a material spraying pipe with a valve, the diameter of the material spraying pipe is smaller than that of the main pipe frame, and the open end of the material spraying pipe is communicated with a furnace body. According to the utility model, by utilizing the difference of the flowing speeds of the edge and the middle part of the spiral blade when combustible gas flows, coal fuel is pushed to enter the furnace body through the material spraying pipe, and the coal fuel and the combustible gas are more uniformly sprayed into the furnace body, so that the combustion at the position of the furnace body is quickly promoted, and the utilization rate of coal powder is improved.

Description

Technical Field

[0001] This utility model belongs to the field of ironmaking equipment, specifically relating to a pulverized coal injection lance for ironmaking blast furnaces. Background Technology

[0002] Pulverized coal injection (PCI) in blast furnaces provides the necessary additional heat and reducing agent, promoting the reduction reaction of iron ore and improving iron smelting efficiency. Secondly, the injected pulverized coal mixes thoroughly with the furnace air, effectively controlling the combustion process and reducing emissions of carbon monoxide and other harmful gases from incomplete combustion, thus benefiting environmental protection. Furthermore, PCI helps regulate blast furnace conditions, improves the uniformity of temperature distribution within the furnace, further optimizes the smelting process, and enhances the quality of molten iron and production efficiency.

[0003] The combustible gas channels inside existing pulverized coal injection nozzles are mostly straight pipe structures. The combustible gas is directly injected into the furnace body while carrying pulverized coal fuel. Due to the variation in the internal diameter of the nozzle, some pulverized coal is easily left inside the straight pipe of the nozzle, and there is also the problem of uneven pulverized coal injection. Utility Model Content

[0004] The purpose of this utility model is to provide a pulverized coal injection lance for ironmaking blast furnaces, which solves the problems of the prior art mentioned in the background.

[0005] To achieve the above objectives, the technical solution adopted by this utility model is as follows: This utility model provides a pulverized coal injection lance for ironmaking blast furnaces, including a main pipe frame. One end of the main pipe frame is connected to the outlet end of a high-pressure gas pump, and the inlet end of the high-pressure gas pump is connected to a combustible gas. The inner wall of the main pipe frame is provided with spiral blades, and the outer wall of the main pipe frame is connected to a coal feed pipe. The coal feed pipe is located away from the high-pressure gas pump. The end of the main pipe frame away from the high-pressure gas pump is connected to a spray pipe with a valve. The diameter of the spray pipe is smaller than the diameter of the main pipe frame, and the open end of the spray pipe is connected to the furnace body.

[0006] As a preferred embodiment, there are multiple coal feed pipes, all of which are connected to the upper part of the main feed frame.

[0007] As a preferred embodiment, the main tube frame is provided with an air inlet chamber at the end facing the high-pressure air pump. The surface of the air inlet chamber facing the main tube frame has multiple air inlets, which are corresponding to the spiral blades. The outside of the air inlet chamber is connected to the high-pressure air pump.

[0008] As a preferred embodiment, the air intake chamber has a frustum-shaped structure, with the smaller end of the frustum facing the spiral blade.

[0009] As a preferred embodiment, the spray pipe is provided with a tapered tube on the side facing the main pipe frame, and the tapered tube and the main pipe frame are connected by a flange.

[0010] As a preferred embodiment, a heating layer is provided on the outer side of the spray pipe and the main frame.

[0011] As a preferred embodiment, the heating layer is a heating wire, which is wound around the outside of the main frame and the spray pipe.

[0012] As a preferred embodiment, the heating layer is a pipe structure, which is wound around the outside of the main pipe frame and the spray pipe. The outside of the furnace body is wound with heat exchange pipes, and the heat exchange pipes and the heating layer are connected in series through a water tank and a circulating pump.

[0013] Compared with the prior art, the advantages and positive effects of this utility model are as follows:

[0014] This invention utilizes the difference in flow velocity between the edge and center of the spiral blades when combustible gas flows, which propels the coal fuel into the furnace through the injection pipe, so as to more evenly spray the coal fuel and combustible gas into the furnace, reduce the fuel residue in the main support and injection pipe, so as to quickly improve the combustion in the furnace and improve the utilization rate of pulverized coal. Attached Figure Description

[0015] To more clearly illustrate the technical solutions of the embodiments of this utility model, the drawings used in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0016] Figure 1 This is a schematic diagram of the internal structure of this utility model;

[0017] Figure 2 This is the front view of this utility model;

[0018] Figure 3 This is an installation structure diagram of the high-pressure air pump of this utility model in other embodiments.

[0019] The annotations in the attached figures are explained as follows:

[0020] 1. Main frame; 101. Coal feed pipe; 102. Air inlet; 103. Air inlet; 2. Spray pipe; 3. Spiral blade; 4. High-pressure air pump; 5. Heating layer. Detailed Implementation

[0021] To better understand the above-mentioned objectives, features, and advantages of this utility model, the present utility model will be further described below with reference to the accompanying drawings and embodiments. It should be noted that, unless otherwise specified, the embodiments and features described in these embodiments can be combined with each other.

[0022] Many specific details are set forth in the following description in order to provide a full understanding of the present invention. However, the present invention may also be implemented in other ways different from those described herein. Therefore, the present invention is not limited to the specific embodiments disclosed in the following specification.

[0023] Example 1:

[0024] See Figures 1-2 As shown, this utility model provides a pulverized coal injection lance for ironmaking blast furnaces, including a main pipe frame 1. One end of the main pipe frame 1 is connected to the outlet of a high-pressure air pump 4, and the inlet of the high-pressure air pump 4 is connected to combustible gas. A spiral blade 3 is provided on the inner wall of the main pipe frame 1, welded to the inner wall. A coal feed pipe 101 is connected to the outer wall of the main pipe frame 1, located near the top surface of the main pipe frame 1 and away from the high-pressure air pump 4. A spray pipe 2 with a valve is connected to the end of the main pipe frame 1 away from the high-pressure air pump 4. The diameter of the spray pipe 2 is smaller than the diameter of the main pipe frame 1, and the open end of the spray pipe 2 is connected to the furnace body. During operation, coal fuel can be guided into the main pipe frame 1 through the coal feed pipe 101, and combustible gas can be guided to the furnace body through the high-pressure air pump 4. Inside the main pipe frame 1, there is a spiral blade 3. The spiral blade 3 can guide the gas close to the inner wall of the main pipe frame 1, so that the gas close to the inner wall of the main pipe frame 1 can be transported in a spiral manner inside the main pipe frame 1, which greatly increases the flow velocity of the combustible gas. The gas close to the middle of the main pipe frame 1 is directly guided inside the main pipe frame 1. The combustible gas has a different velocity when it is guided inside the main pipe frame 1, which pushes the coal fuel into the furnace body through the injection pipe 2. The spiral-moving combustible gas can be used to transport the combustible gas and clean the inner wall of the main pipe frame and the injection pipe, thereby greatly reducing the fuel residue in the main pipe frame and the injection pipe. The coal fuel and combustible gas are more evenly injected into the furnace body, so as to quickly improve the combustion in the furnace body and improve the utilization rate of coal powder.

[0025] Furthermore, there are multiple coal feed pipes 101, all of which are connected to the upper part of the main pipe frame 1. This allows the combustible gas to fully inject fuel into the feed pipe 2, greatly reducing the residual fuel in the main pipe frame 1.

[0026] Example 2 differs from Example 1 in that:

[0027] refer to Figure 3The main pipe frame 1 has an air inlet chamber 102 at the end facing the high-pressure air pump 4. Multiple air inlets 103 penetrate the surface of the air inlet chamber 102 facing the main pipe frame 1. The air inlets 103 are correspondingly arranged with the spiral blades 3. The outside of the air inlet chamber 102 is connected to the high-pressure air pump 4. When the high-pressure air pump 4 delivers combustible gas, it delivers the gas into the air inlet chamber 102. The gas can be guided into the main pipe frame 1 through the multiple air inlets 103 on the air inlet chamber 102. The air inlets 103 are circumferentially distributed with the axis of the main pipe frame 1 as the reference. The air inlets 103 correspond to the spiral blades 3, which can allow most of the gas to be guided with the movement of the spiral blades 3. The gas is spirally guided in the main pipe frame 1, which improves the fuel injection effect. Furthermore, the air inlet chamber 102 has a frustum-shaped structure, and the small end of the frustum faces the spiral blades 3.

[0028] Example 3 differs from Example 1 in that:

[0029] The main frame 1 and the spray pipe 2 have different diameters, with the diameter of the spray pipe 2 being smaller than that of the main frame 1. The spray pipe 2 has a tapered tube on the side facing the main frame 1, and the tapered tube and the main frame 1 are connected by a flange. The connection between the main frame 1 and the spray pipe 2 is achieved by using the flange, which facilitates cleaning and maintenance of the inside of the main frame 1 and the spray pipe 2 after disassembly.

[0030] Example 4 differs from Example 1 in that:

[0031] A heating layer 5 is provided on the outside of the spray pipe 2 and the main pipe frame 1. The heating layer 5 is used to heat the main pipe frame 1 and the spray pipe 2 to increase the temperature so that the fuel injected into the furnace body can be quickly put into a combustion state, thereby achieving a rapid increase in the internal temperature of the furnace body. Furthermore, the heating layer 5 is a heating wire, which is wrapped around the outside of the main pipe frame 1 and the spray pipe 2 to achieve the heating operation of the main pipe frame 1 and the spray pipe 2.

[0032] The difference between Example 5 and Example 4 is that:

[0033] The heating layer 5 is a pipe structure, which is wound around the outside of the main pipe frame 1 and the injection pipe 2. The outside of the furnace body is wound with heat exchange tubes. The heat exchange tubes and the heating layer 5 are connected in series through a water tank and a circulation pump. The water tank and the circulation pump can circulate the liquid inside the heat exchange tubes and the heating layer 5. The heat exchange tubes can exchange and reuse part of the heat outside the furnace body. The temperature of the liquid inside the heat exchange tubes is increased, thereby increasing the temperature of the liquid inside the heating layer 5. This can heat the main pipe frame 1 and the injection pipe 2. After the temperature is increased, the fuel injected into the furnace body can be burned quickly.

[0034] All standard parts used in this utility model can be purchased from the market, and irregular parts can be customized according to the description and drawings. The specific connection methods of each part adopt conventional methods such as bolts, rivets, and welding that are mature in the prior art. The machinery, parts and equipment adopt conventional models in the prior art. In addition, the circuit connection adopts conventional connection methods in the prior art, which will not be described in detail here. The contents not described in detail in this specification belong to the prior art known to those skilled in the art.

[0035] The above description is merely a preferred embodiment of the present utility model and is not intended to limit the present utility model in any other way. Any person skilled in the art may make changes or modifications to the above-disclosed technical content to create equivalent embodiments for application in other fields. However, any simple modifications, equivalent changes, and modifications made to the above embodiments based on the technical essence of the present utility model without departing from the technical solution of the present utility model shall still fall within the protection scope of the technical solution of the present utility model.

Claims

1. A pulverized coal injection lance for an ironmaking blast furnace, comprising a main pipe frame (1), characterized in that, One end of the main pipe frame (1) is connected to the outlet of the high-pressure air pump (4), and the inlet of the high-pressure air pump (4) is connected to the combustible gas. The inner wall of the main pipe frame (1) is provided with a spiral blade (3), and the outer wall of the main pipe frame (1) is connected to a coal feed pipe (101). The coal feed pipe (101) is located away from the high-pressure air pump (4). The end of the main pipe frame (1) away from the high-pressure air pump (4) is connected to a spray pipe (2) with a valve. The diameter of the spray pipe (2) is smaller than the diameter of the main pipe frame (1), and the open end of the spray pipe (2) is connected to the furnace body.

2. The pulverized coal injection lance for ironmaking blast furnaces according to claim 1, characterized in that, There are multiple coal feed pipes (101), and all of them are connected to the upper part of the main frame (1).

3. The pulverized coal injection lance for ironmaking blast furnaces according to claim 1, characterized in that, The main frame (1) is provided with an air inlet chamber (102) facing the high-pressure air pump (4). The surface of the air inlet chamber (102) facing the main frame (1) has multiple air inlets (103). The air inlets (103) are correspondingly arranged with the spiral blade (3). The outside of the air inlet chamber (102) is connected to the high-pressure air pump (4).

4. The pulverized coal injection lance for ironmaking blast furnaces according to claim 1, characterized in that, The spray pipe (2) is provided with a tapered pipe on the side facing the main pipe frame (1), and the tapered pipe and the main pipe frame (1) are connected by a flange.

5. A pulverized coal injection lance for ironmaking blast furnaces according to claim 1, characterized in that, A heating layer (5) is provided on the outside of the spray pipe (2) and the main frame (1).

6. A pulverized coal injection lance for ironmaking blast furnaces according to claim 5, characterized in that, The heating layer (5) is a heating wire, which is wound around the outside of the main frame (1) and the spray pipe (2).

7. A pulverized coal injection lance for ironmaking blast furnaces according to claim 5, characterized in that, The heating layer (5) is a pipe structure, which is wound around the outside of the main pipe frame (1) and the spray pipe (2). The outside of the furnace body is wound with heat exchange pipes, and the heat exchange pipes and the heating layer (5) are connected in series through a water tank and a circulating pump.

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