Blast furnace pulverized coal distribution device

Abstract

The utility model relates to a blast furnace pulverized coal distribution device which comprises a pulverized coal distributor body and a plurality of distribution branch pipes, the distribution branch pipes are correspondingly connected with blast furnace tuyeres through coal conveying pipes, nitrogen branch pipes are connected to the distribution branch pipes connected with the coal conveying pipes with the length exceeding 50 m, the nitrogen branch pipes are connected to a nitrogen main pipe, and the nitrogen main pipe is connected with a nitrogen tank. And the periphery of the pulverized coal distributor body is connected with a steam coil pipe. And a steam inlet pipe and a steam outlet pipe are arranged on the steam coil pipe. According to the utility model, the coal injection quantity of each blast furnace tuyere is uniform, and pulverized coal in the tuyere is completely combusted. The pulverized coal is heated in the distributor, it is guaranteed that the temperature of the pulverized coal is above the dew point, gasification and pyrolysis of the pulverized coal in front of the tuyere are promoted, the pulverized coal reacts and combusts rapidly, the combustion rate of the pulverized coal is increased, fuel consumption of a blast furnace is reduced, meanwhile, the phenomenon that the pulverized coal is blocked in the distributor and a pipeline can be prevented, and the injection stability and uniformity are improved.

Description

Technical Field

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

[0002] In order to reduce the consumption of expensive coke, blast furnaces use low-priced pulverized coal sprayed from the tuyere. The ground pulverized coal is transported from the coal spraying main pipeline to the coal distributor on the blast furnace tuyere platform, and then the coal spraying branch pipe of the coal distributor transports the pulverized coal to each tuyere. There are many tuyere in modern large blast furnaces, with 30-60 tuyere. Due to the uneven distance from the coal distributor to each tuyere, the shortest distance is 5 meters and the longest distance is more than 500 meters, resulting in uneven amount of pulverized coal transported in each pulverized coal branch pipe. The tuyere with a closer distance sprays more coal, while the tuyere with a farther distance sprays less coal. The pulverized coal in the tuyere with a large amount of coal spray is not completely burned and enters the soft melting zone, resulting in a decrease in the permeability of the soft melting zone, affecting the stable and smooth operation of the blast furnace, increasing the blast furnace fuel ratio, and increasing the cost of pig iron. Summary of the invention

[0003] The technical problem to be solved by the utility model is to provide a blast furnace coal powder distribution device to improve the stability and uniformity of coal powder injection.

[0004] In order to achieve the above purpose, the utility model adopts the following technical solutions:

[0005] A blast furnace coal powder distribution device comprises a coal powder distributor body and a plurality of distribution branch pipes, wherein the distribution branch pipes are connected to the blast furnace tuyere through a coal delivery pipe, a nitrogen branch pipe is connected to the distribution branch pipe connected to the coal delivery pipe longer than 50 m, the nitrogen branch pipe is connected to the nitrogen main pipe, and a steam coil is connected to the periphery of the coal powder distributor body.

[0006] The nitrogen main pipe is connected to the nitrogen tank.

[0007] The nitrogen main pipe and the nitrogen branch pipe are both provided with regulating valves.

[0008] The steam coil is provided with a steam inlet pipe and a steam outlet pipe.

[0009] An opening and closing valve is arranged at one end of the steam inlet pipe.

[0010] The on-off valve is a manual on-off valve or a pneumatic on-off valve.

[0011] One end of the steam outlet pipe is provided with a drain valve.

[0012] Compared with the existing technology, the beneficial effects of the utility model are:

[0013] The utility model makes the coal injection amount of each blast furnace tuyere uniform and the coal powder in the tuyere is completely burned. The coal powder is heated in the distributor to ensure that the coal powder temperature is above the dew point, promotes the gasification and pyrolysis of the coal powder in front of the tuyere, reduces the heat and time required for the coal powder to be heated from room temperature to the combustion temperature at the front end of the blast furnace tuyere, and moves the coal powder combustion area forward. The coal powder reacts and burns quickly in the heated state, which is not only conducive to improving its combustion rate and reducing the fuel consumption of the blast furnace, but also prevents the blockage of the coal powder in the distributor and pipeline, and improves the stability and uniformity of the injection. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 It is a structural schematic diagram of the utility model.

[0015] Figure 2 It is a top view of the utility model.

[0016] Figure 3 This is a schematic diagram of the pulverized coal distributor body. DETAILED DESCRIPTION

[0017] In the description of the present invention, it should be understood that the terms "first", "second", etc. are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Therefore, a feature defined as "first", "second", etc. may explicitly or implicitly include one or more of the features. In the description of the present invention, unless otherwise specified, "plurality" means more than two.

[0018] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installation", "connection" and "connection" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood by specific circumstances.

[0019] like Figure 1-Figure 3 A blast furnace coal powder distribution device comprises a coal powder distributor body 1 and a plurality of distribution branch pipes 2, wherein the distribution branch pipes 2 are connected to the blast furnace tuyere 4 through a coal delivery pipe 3, and a nitrogen branch pipe 5 is connected to the distribution branch pipe 2 connected to the coal delivery pipe 3 with a length of more than 50m, and the nitrogen branch pipe 5 is connected to the nitrogen main pipe 6, and the nitrogen main pipe 6 is connected to the nitrogen tank 7. A regulating valve 8 is provided on both the nitrogen main pipe 6 and the nitrogen branch pipe 5. Nitrogen enters each of the distribution branch pipes at a long distance, accelerates the flow of coal powder, increases the amount of coal powder in each of the distribution branch pipes at a long distance, and adjusts the nitrogen flow of each nitrogen branch pipe through the regulating valve, so that the coal injection amount of the blast furnace tuyere tends to be consistent.

[0020] A steam coil 9 is connected to the outer periphery of the coal powder distributor body 1. A steam inlet pipe 10 and a steam outlet pipe 11 are provided on the steam coil 9. An on-off valve 12 is provided at one end of the steam inlet pipe 10. The on-off valve 12 is a manual on-off valve or a pneumatic on-off valve. A steam trap 13 is provided at one end of the steam outlet pipe 11. Steam is a heat transfer conductor with high heat transfer performance, and has the characteristics of large heat transfer capacity and high heat transfer efficiency. A steam coil 9 is provided at the outer periphery of the coal powder distributor body 1 to heat the coal powder in the distributor, ensure that the coal powder temperature is above the dew point, promote the gasification and pyrolysis of the coal powder before the tuyere, reduce the heat and time required for the coal powder to be heated from room temperature to the combustion temperature at the front end of the blast furnace tuyere, and move the coal powder combustion area forward. The rapid reaction and combustion of coal powder at high temperature is not only conducive to improving its combustion rate and reducing the fuel consumption of the blast furnace, but also prevents the blockage of coal powder in the distributor and pipeline, and improves the stability and uniformity of injection.

[0021] In order to make the purpose, technical scheme and technical effect of the utility model clearer, the technical scheme in the embodiment of the utility model is now described clearly and completely. However, the embodiment described below is only a part of the embodiment of the utility model, not all of the embodiments. In combination with the embodiments of 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. Example

[0022] A blast furnace coal powder distribution device comprises a coal powder distributor body 1 and a distribution branch pipe 2, wherein the distribution branch pipe 2 is correspondingly connected to a blast furnace tuyere 4 through a coal delivery pipe 3, and a nitrogen branch pipe 5 is connected to the distribution branch pipe 2 connected to the coal delivery pipe 3 having a length of more than 50 m, and the nitrogen branch pipe 5 is connected to a nitrogen main pipe 6, and the nitrogen main pipe 6 is connected to a nitrogen tank 7. A regulating valve 8 is provided on both the nitrogen main pipe 6 and the nitrogen branch pipe 5.

[0023] A steam coil 9 is connected to the outer periphery of the pulverized coal distributor body 1. The steam coil 9 is made of a 20 mm diameter seamless steel pipe, with a 10 cm interval between each circle. A steam inlet pipe 10 and a steam outlet pipe 11 are provided on the steam coil 9. An on-off valve 12 is provided at one end of the steam inlet pipe 10. A steam trap 13 is provided at one end of the steam outlet pipe 11. Example

[0024] A blast furnace coal powder distribution device comprises a coal powder distributor body 1 and a distribution branch pipe 2, wherein the distribution branch pipe 2 is correspondingly connected to a blast furnace tuyere 4 through a coal delivery pipe 3, and a nitrogen branch pipe 5 is connected to the distribution branch pipe 2 connected to the coal delivery pipe 3 having a length of more than 50 m, and the nitrogen branch pipe 5 is connected to a nitrogen main pipe 6, and the nitrogen main pipe 6 is connected to a nitrogen tank 7. A regulating valve 8 is provided on both the nitrogen main pipe 6 and the nitrogen branch pipe 5.

[0025] A steam coil 9 is connected to the outer periphery of the coal powder distributor body 1. The steam coil 9 is made of a seamless steel pipe with a diameter of 22 mm, and each circle is spaced 15 cm apart. A steam inlet pipe 10 and a steam outlet pipe 11 are provided on the steam coil 9. An on-off valve 12 is provided at one end of the steam inlet pipe 10. A steam trap 13 is provided at one end of the steam outlet pipe 11.

[0026] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and basic spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A blast furnace coal powder distribution device, characterized in that: It includes a pulverized coal distributor body and several distribution branches. The distribution branches are connected to the blast furnace tuyere through a coal delivery pipe. The distribution branches connected to the coal delivery pipe that is more than 50m long are connected to a nitrogen branch. The nitrogen branch is connected to the nitrogen main pipe. A steam coil is connected to the periphery of the pulverized coal distributor body.

2. A blast furnace coal powder distribution device according to claim 1, characterized in that: The nitrogen main pipe is connected to the nitrogen tank.

3. A blast furnace coal powder distribution device according to claim 1, characterized in that: The nitrogen main pipe and the nitrogen branch pipe are both provided with regulating valves.

4. A blast furnace coal powder distribution device according to claim 1, characterized in that: The steam coil is provided with a steam inlet pipe and a steam outlet pipe.

5. A blast furnace coal powder distribution device according to claim 4, characterized in that: An opening and closing valve is arranged at one end of the steam inlet pipe.

6. A blast furnace coal powder distribution device according to claim 5, characterized in that: The on-off valve is a manual on-off valve or a pneumatic on-off valve.

7. A blast furnace coal powder distribution device according to claim 4, characterized in that: One end of the steam outlet pipe is provided with a drain valve.

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