System for improving coal injection reliability of blast furnace

Abstract

The utility model relates to the technical field of blast furnaces, and discloses a system for improving the coal injection reliability of a blast furnace, which comprises two blast furnace systems, a powder making device; the pulverized coal bunker is communicated with the pulverizing device; the at least three groups of injection tanks are communicated with the pulverized coal bunker; one end of the coal injection header pipe is communicated with the injection tank, and the other end of the coal injection header pipe is communicated with the blast furnace body; and one end of the coal injection standby pipe is communicated with the injection tank, and the other end of the coal injection standby pipe is communicated with a coal injection header pipe in the other blast furnace system. By means of the system for improving the coal injection reliability of the blast furnace, the continuity and reliability of pulverized coal supply in the blast furnace smelting production process can be improved.

Description

Technical Field

[0001] This utility model relates to the field of blast furnace technology, specifically to a system for improving the reliability of pulverized coal injection in blast furnaces. Background Technology

[0002] Modern large steel plants typically have multiple blast furnaces. The fuel required for blast furnace smelting is coke and pulverized coal. Each blast furnace is equipped with its own pulverized coal injection system, and these systems operate independently without interconnection. If the pulverized coal preparation and injection system of one blast furnace malfunctions, and the maintenance period is too long, the blast furnace may stop injecting pulverized coal due to consumption and lack of timely replenishment. This "one-to-one" pulverized coal preparation and injection mode affects the continuity and reliability of pulverized coal supply for blast furnace production. Utility Model Content

[0003] This utility model was made to solve the above-mentioned technical problems. One of its objectives is to provide a system for improving the reliability of pulverized coal injection in blast furnaces. This system can improve the continuity and reliability of pulverized coal supply during the blast furnace smelting process.

[0004] According to one embodiment of the present invention, a system for improving the reliability of pulverized coal injection in a blast furnace is provided, comprising two blast furnace systems. Each blast furnace system includes: a blast furnace body; a pulverizing device; a pulverized coal silo connected to the pulverizing device; at least three sets of injection canisters connected to the pulverized coal silo; a pulverized coal injection main pipe, one end of which is connected to the injection canister and the other end of which is connected to the blast furnace body; and a pulverized coal injection backup pipe, one end of which is connected to the injection canister and the other end of which is connected to the pulverized coal injection main pipe in another blast furnace system.

[0005] As one implementation, a coal feeding valve is provided on the output pipeline of the injection tank.

[0006] As one implementation, the front end of the output pipeline forms two branches that are respectively connected to the main pulverized coal injection pipe and the backup pulverized coal injection pipe.

[0007] As one implementation, a shut-off valve is provided on the branch.

[0008] As one implementation, a pulverized coal injection switching valve is provided on the pulverized coal injection backup pipe.

[0009] In one implementation, the plurality of injection tanks are configured to sequentially supply pulverized coal to the blast furnace body of the blast furnace system through the pulverized coal injection manifold, and receive pulverized coal replenished from the pulverized coal silo after the pulverized coal reaches a preset lower limit.

[0010] In one implementation, at least one injection tank in a blast furnace system is configured as a standby injection tank connected to the injection backup pipe in another blast furnace system, while the remaining injection tanks are configured to alternately supply pulverized coal to the blast furnace body of their respective blast furnace system through the pulverized coal injection main pipe, and receive pulverized coal replenished from the pulverized coal silo after the pulverized coal reaches a preset lower limit.

[0011] In one embodiment, the backup pulverized coal injection tank is configured to supply pulverized coal to the blast furnace body of another blast furnace system via a backup pulverized coal injection pipe when the pulverizing unit in that other blast furnace system fails.

[0012] This invention proposes a system to improve the reliability of pulverized coal injection in blast furnaces. This system can connect the pulverized coal injection pipelines of two blast furnace systems together. When the pulverizing device of one blast furnace system fails and requires a long period of maintenance, the injection tank of the other blast furnace system can input pulverized coal into the main pulverized coal injection pipe of the first blast furnace system through the backup pulverized coal injection pipe, ensuring that the blast furnace body of the first blast furnace system can continue to operate. Attached Figure Description

[0013] Figure 1 This is a schematic diagram of the structure of a system for improving the reliability of blast furnace pulverized coal injection, as described in one embodiment of this utility model. Detailed Implementation

[0014] Exemplary embodiments will now be described more fully with reference to the accompanying drawings. However, exemplary embodiments can be implemented in many forms and should not be construed as limited to the examples set forth herein; rather, these embodiments are provided so that this disclosure will be more comprehensive and complete, and will fully convey the concept of exemplary embodiments to those skilled in the art. The described features, structures, or characteristics may be combined in any suitable manner in one or more embodiments.

[0015] Furthermore, the accompanying drawings are merely illustrative of this disclosure and are not necessarily drawn to scale. The same reference numerals in the drawings denote the same or similar parts, and therefore repeated descriptions of them will be omitted. It should be noted that in this disclosure, the terms "comprising," "configured with," and "set in" are used to indicate an open-ended inclusion, meaning that additional elements / components / etc. may exist besides those listed; the terms "first," "second," etc., are used only as labels and are not intended to limit the number or order of objects; the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this utility model.

[0016] Unless otherwise expressly specified and limited, the terms "installation," "connection," and "linking" should be interpreted broadly. For example, they can refer to fixed connections, detachable connections, or integral connections; they can refer to mechanical connections or electrical connections; they can refer to direct connections or indirect connections through an intermediate medium; and they can refer to the internal connection between two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.

[0017] According to one embodiment of the present invention, a system for improving the reliability of blast furnace pulverized coal injection is provided, such as... Figure 1 As shown, the system includes two blast furnace systems. Each blast furnace system includes a blast furnace body, a pulverizing unit, a pulverized coal silo, three sets of injection tanks, a pulverized coal main pipe, and a pulverized coal backup pipe.

[0018] The blast furnace body is used for smelting operations, the pulverizing unit is used to prepare coke pulverized coal required for blast furnace smelting, the pulverized coal silo is used to temporarily store the coke pulverized coal processed by the pulverizing unit and transfer it to three sets of injection tanks, which then supply pulverized coal to the blast furnace through the injection manifold.

[0019] Specifically, the output of the pulverizing unit is connected to the input of the pulverized coal silo via pipeline, enabling real-time transfer of the produced coke pulverized coal to the silo. The output of the pulverized coal silo is connected to the input of three sets of injection tanks via three separate pipelines, supplying pulverized coal to each injection tank. The output of each injection tank is connected to the main pulverized coal injection pipe and the backup pulverized coal injection pipe via pipeline. The output of the main pulverized coal injection pipe is connected to the blast furnace body, and the output of the backup pulverized coal injection pipe is connected to the main pulverized coal injection pipe of another blast furnace system. The injection tanks can supply pulverized coal to the blast furnace body of their respective blast furnace system via the main pulverized coal injection pipe, and can also supply pulverized coal to the main pulverized coal injection pipes of other blast furnace systems via the backup pulverized coal injection pipe, ensuring that the blast furnace bodies of other blast furnace systems do not experience pulverized coal shortages.

[0020] This system, which improves the reliability of pulverized coal injection in blast furnaces, can connect the pulverized coal injection pipelines of multiple blast furnace systems. When the pulverizing unit of one blast furnace system fails and requires a long period of maintenance, the injection tank of another blast furnace system can input pulverized coal into the main pulverized coal injection pipe of that blast furnace system through the backup pulverized coal injection pipe, ensuring that the blast furnace body of that blast furnace system can continue to operate.

[0021] like Figure 1As shown, in this embodiment, each of the three injection tanks in the blast furnace system is equipped with a coal feeding valve on its output pipeline, allowing the user to select any one of the injection tanks to inject pulverized coal into the blast furnace body. Two branches are formed on the output pipeline of the injection tanks, respectively connected to the main pulverized coal injection pipe and the backup pulverized coal injection pipe, to independently supply pulverized coal to the main pulverized coal injection pipe and the backup pulverized coal injection pipe. Furthermore, a shut-off valve is also installed on this branch, allowing the user to choose whether to supply pulverized coal from the main pulverized coal injection pipe or the backup pulverized coal injection pipe.

[0022] In addition, a switching valve is installed on the pulverized coal injection backup pipe to facilitate user operation in deciding whether to connect the pulverized coal injection main pipe and the pulverized coal injection backup pipe in the two blast furnace systems together.

[0023] When using this system to improve the reliability of blast furnace pulverized coal injection for production operations, the following methods should be followed:

[0024] First, each blast furnace system supplies pulverized coal to the pulverized coal silo through its own pulverizing device, and then transports it to three injection tanks. Any one of the three injection tanks supplies pulverized coal to the blast furnace body through the pulverized coal injection manifold.

[0025] Secondly, when the pulverized coal in one injection tank reaches the preset lower limit, the system switches to supplying pulverized coal to the blast furnace body through the pulverized coal injection manifold from another injection tank. The injection tank where the pulverized coal reaches the preset lower limit receives the pulverized coal replenished from the pulverized coal silo.

[0026] Finally, in the event of a pulverizing unit failure in one blast furnace system, pulverized coal is supplied to the blast furnace body of that system via a pulverized coal injection tank that is not currently performing pulverized coal injection operations through a pulverized coal injection backup pipe.

[0027] This method allows the pulverized coal injection pipelines of two blast furnace systems to be connected together. If the pulverizing unit of one blast furnace system fails and requires a long period of maintenance, the injection tank of the other blast furnace system can input pulverized coal into the main injection pipe of the first blast furnace system through the backup injection pipe, ensuring that the blast furnace body of the first blast furnace system can continue to operate.

[0028] In this embodiment, each blast furnace system is equipped with three sets of injection tanks. In other embodiments, the number of injection tanks can be increased according to actual needs, so as to supply pulverized coal to each blast furnace more continuously.

[0029] In one implementation, multiple injection tanks in each blast furnace system are configured to sequentially supply pulverized coal to the blast furnace body through the pulverized coal injection manifold, and receive replenished pulverized coal from the pulverized coal silo after the pulverized coal reaches a preset lower limit. This ensures a stable and continuous supply of pulverized coal to the blast furnace body within the system. The sequential supply of pulverized coal from the three injection tanks also allows sufficient time for replenishment of pulverized coal to the injection tanks after the preset lower limit is reached.

[0030] In one implementation, at least one injection tank in a blast furnace system is configured as a standby injection tank connected to the backup injection pipe of another blast furnace system. The remaining injection tanks are configured to alternately supply pulverized coal to the blast furnace body of their respective blast furnace system via the pulverized coal injection main, and receive pulverized coal replenished from the pulverized coal silo after the pulverized coal reaches a preset lower limit. This ensures a stable and continuous supply of pulverized coal to the blast furnace body within the system, while the sequential supply of pulverized coal from the remaining injection tanks allows time for replenishment of pulverized coal after the preset lower limit is reached. The standby injection tank can supply pulverized coal to the pulverized coal injection main of another blast furnace system via the backup injection pipe when the pulverizing unit in that system malfunctions, allowing sufficient time for repair of the pulverizing unit and ensuring the continuous operation of the blast furnace body within that system.

[0031] The following specific embodiments further illustrate the above-mentioned system for improving the reliability of blast furnace pulverized coal injection. Figure 1 As shown, the system consists of two blast furnace systems: the first blast furnace system on the left and the second blast furnace system on the right.

[0032] The first blast furnace system includes a first pulverizing unit 1-15, a first pulverized coal silo 1-1, three injection tanks, designated as first injection tank 1-2, second injection tank 1-3, and third injection tank 1-4, a first pulverized coal injection main pipe 1-16, and a first pulverized coal injection backup pipe 1-17. A first coal discharge valve 1-5 is installed on the output pipe of the first injection tank 1-2, a second coal discharge valve 1-8 is installed on the output pipe of the second injection tank 1-3, and a third coal discharge valve 1-11 is installed on the output pipe of the third injection tank 1-4.

[0033] A first shut-off valve 1-6 is installed on the branch line connecting the output end pipeline of the first pulverized coal injection tank 1-2 to the first pulverized coal injection main pipeline 1-16; a second shut-off valve 1-7 is installed on the branch line connecting the output end pipeline of the first pulverized coal injection tank 1-2 to the first pulverized coal injection backup pipeline 1-17; a third shut-off valve 1-9 is installed on the branch line connecting the output end pipeline of the second pulverized coal injection tank 1-3 to the first pulverized coal injection main pipeline 1-16; a fourth shut-off valve 1-10 is installed on the branch line connecting the output end pipeline of the second pulverized coal injection tank 1-3 to the first pulverized coal injection backup pipeline 1-17; a fifth shut-off valve 1-12 is installed on the branch line connecting the output end pipeline of the third pulverized coal injection tank 1-4 to the first pulverized coal injection main pipeline 1-16; and a sixth shut-off valve 1-13 is installed on the branch line connecting the output end pipeline of the third pulverized coal injection tank 1-4 to the first pulverized coal injection backup pipeline 1-17. One end of the first pulverized coal injection main pipe 1-16 is connected to the first pulverized coal injection tank 1-2, the second pulverized coal injection tank 1-3, and the third pulverized coal injection tank 1-4, and the other end of the first pulverized coal injection main pipe 1-16 is connected to the first blast furnace body 1-14, enabling the supply of pulverized coal to the first blast furnace body 1-14. One end of the first pulverized coal injection backup pipe 1-17 is connected to the first pulverized coal injection tank 1-2, the second pulverized coal injection tank 1-3, and the third pulverized coal injection tank 1-4, and the other end of the first pulverized coal injection backup pipe 1-17 is connected to the second pulverized coal injection main pipe 2-16 in the second blast furnace system, enabling the supply of pulverized coal to the second pulverized coal injection main pipe 2-16 when needed.

[0034] The second blast furnace system includes a second pulverizing unit 2-15, a second pulverized coal silo 2-1, three injection tanks (designated as fourth injection tank 2-2, fifth injection tank 2-3, and sixth injection tank 2-4), a second pulverized coal injection main pipe 2-16, and a second pulverized coal injection backup pipe 2-17. A fourth coal discharge valve 2-5 is installed on the output pipe of the fourth injection tank 2-2, a fifth coal discharge valve 2-8 is installed on the output pipe of the fifth injection tank 2-3, and a sixth coal discharge valve 2-11 is installed on the output pipe of the sixth injection tank 2-4.

[0035] A seventh shut-off valve 2-6 is installed on the branch line connecting the output end pipeline of the fourth pulverized coal injection tank 2-2 to the second pulverized coal injection main pipeline 2-16; an eighth shut-off valve 2-7 is installed on the branch line connecting the output end pipeline of the fourth pulverized coal injection tank 2-2 to the second pulverized coal injection backup pipeline 2-17; a ninth shut-off valve 2-9 is installed on the branch line connecting the output end pipeline of the fifth pulverized coal injection tank 2-3 to the second pulverized coal injection main pipeline 2-16; a tenth shut-off valve 2-10 is installed on the branch line connecting the output end pipeline of the fifth pulverized coal injection tank 2-3 to the second pulverized coal injection backup pipeline 2-17; an eleventh shut-off valve 2-12 is installed on the branch line connecting the output end pipeline of the sixth pulverized coal injection tank 2-4 to the second pulverized coal injection main pipeline 2-16; and a twelfth shut-off valve 2-13 is installed on the branch line connecting the output end pipeline of the sixth pulverized coal injection tank 2-4 to the second pulverized coal injection backup pipeline 2-17. One end of the second pulverized coal injection main 2-16 is connected to the fourth injection tank 2-2, the fifth injection tank 2-3, and the sixth injection tank 2-4, and the other end is connected to the second blast furnace body 2-14, enabling the supply of pulverized coal to the second blast furnace body 2-14. One end of the second pulverized coal injection backup pipe 2-17 is connected to the fourth injection tank 2-2, the fifth injection tank 2-3, and the sixth injection tank 2-4, and the other end is connected to the first pulverized coal injection main 1-16 in the first blast furnace system, enabling the supply of pulverized coal to the first pulverized coal injection main 1-16 when needed.

[0036] When using this system to improve the reliability of blast furnace pulverized coal injection for production operations, the following methods for improving the reliability of blast furnace pulverized coal injection shall be followed:

[0037] First, the first pulverizing unit 1-15 in the first blast furnace system supplies pulverized coal to the first pulverized coal bin 1-1, which is then conveyed to the first injection tank 1-2, the second injection tank 1-3, and the third injection tank 1-4. Then, the first coal discharge valve 1-5 and the first shut-off valve 1-6 are opened, allowing the first injection tank 1-2 to supply pulverized coal to the first blast furnace body 1-14 via the first pulverized coal injection main pipe 1-16. Similarly, the second pulverizing unit 2-15 in the second blast furnace system supplies pulverized coal to the second pulverized coal bin 2-1, which is then conveyed to the fourth injection tank 2-2, the fifth injection tank 2-3, and the sixth injection tank 2-4. Then, the fourth coal discharge valve 2-5 and the seventh shut-off valve 2-6 are opened, allowing the fourth injection tank 2-2 to supply pulverized coal to the second blast furnace body 2-14 via the second pulverized coal injection main pipe 2-16.

[0038] Subsequently, when the pulverized coal in the first injection tank 1-2 reaches the preset lower limit, the first coal supply valve 1-5 and the first shut-off valve 1-6 are closed, while the second coal supply valve 1-8 and the third shut-off valve 1-9 are opened, switching the supply of pulverized coal from the second injection tank 1-3 to the first blast furnace body 1-14 through the first pulverized coal injection main pipe 1-16; when the pulverized coal in the fourth injection tank 2-2 reaches the preset lower limit, the fourth coal supply valve 2-5 and the seventh shut-off valve 2-6 are closed, while the fifth coal supply valve 2-8 and the ninth shut-off valve 2-9 are opened, switching the supply of pulverized coal from the fifth injection tank 2-3 to the second blast furnace body 2-14 through the second pulverized coal injection main pipe 2-16.

[0039] Finally, in the event of a malfunction in the first pulverizing unit 1-15 of the first blast furnace system, pulverized coal is supplied by the sixth injection tank 2-4 of the second blast furnace system to the first pulverized coal main pipe 1-16 and the first blast furnace body 1-14 of the first blast furnace system via the second pulverized coal preparation pipe 2-17; or, in the event of a malfunction in the second pulverizing unit 2-15 of the second blast furnace system, pulverized coal is supplied by the third injection tank 1-4 of the first blast furnace system to the second pulverized coal main pipe 2-16 and the second blast furnace body 2-14 of the second blast furnace system via the first pulverized coal preparation pipe 1-17.

[0040] In this embodiment, the third injection tank 1-4 and the sixth injection tank 2-4 serve as backup injection tanks and do not directly participate in the pulverized coal injection operation of their respective blast furnace systems. They are only used to inject pulverized coal into other blast furnace systems. Of course, in practical applications, the three injection tanks in the first blast furnace system sequentially supply pulverized coal to the first blast furnace body 1-14 through the first pulverized coal injection main pipe 1-16, and receive pulverized coal replenished by the first pulverized coal silo 1-1 after the pulverized coal reaches a preset lower limit. Correspondingly, when the second pulverizing unit 2-15 fails, the three injection tanks that are not performing pulverized coal injection operations supply coal to the first pulverized coal injection backup pipe 1-17 and the second pulverized coal injection main pipe 2-16. Similarly, the three injection tanks in the second blast furnace system sequentially supply pulverized coal to the second blast furnace body 2-14 through the second pulverized coal injection main pipe 2-16, and receive pulverized coal replenished by the second pulverized coal silo 2-1 after the pulverized coal reaches a preset lower limit. Correspondingly, when the first pulverizing unit 1-15 fails, the three injection tanks that are not performing pulverized coal injection operations supply coal to the second pulverized coal injection backup pipe 2-17 and the first pulverized coal injection main pipe 1-16. Both systems can ensure the continuous and stable smelting operation of the blast furnaces in both systems.

[0041] It will be apparent to those skilled in the art that this invention is not limited to the details of the exemplary embodiments described above, and that it can be implemented in other specific forms without departing from the spirit or essential characteristics of this invention. Therefore, the embodiments should be considered illustrative and non-limiting in all respects, and the scope of this invention is defined by the appended claims rather than the foregoing description. Thus, it is intended that all variations falling within the meaning and scope of equivalents of the claims be included within this invention. No reference numerals in the claims should be construed as limiting the scope of the claims.

Claims

1. A system for improving the reliability of pulverized coal injection in blast furnaces, comprising a two-blast furnace system, characterized in that, The blast furnace system includes: Blast furnace body; Powder making equipment; A pulverized coal silo is connected to the pulverizing device; No fewer than three sets of injection tanks are connected to the pulverized coal silo; The pulverized coal injection main pipe is connected at one end to the injection tank and at the other end to the blast furnace body; The pulverized coal injection backup pipe is connected at one end to the injection tank and at the other end to the main pulverized coal injection pipe in another blast furnace system.

2. The system for improving the reliability of blast furnace pulverized coal injection as described in claim 1, characterized in that, A coal feeding valve is installed on the output pipeline of the injection tank.

3. The system for improving the reliability of blast furnace pulverized coal injection as described in claim 2, characterized in that, The output pipeline forms two branches at its front end, which are respectively connected to the main pulverized coal injection pipe and the backup pulverized coal injection pipe.

4. The system for improving the reliability of blast furnace pulverized coal injection as described in claim 3, characterized in that, A shut-off valve is installed on the branch line.

5. The system for improving the reliability of blast furnace pulverized coal injection as described in claim 1, characterized in that, The pulverized coal preparation pipe is equipped with a pulverized coal switching valve.

6. The system for improving the reliability of blast furnace pulverized coal injection as described in any one of claims 1 to 5, characterized in that, Multiple injection tanks are configured to sequentially supply pulverized coal to the blast furnace body of their respective blast furnace systems through the pulverized coal injection manifold, and receive pulverized coal replenished from the pulverized coal silo after the pulverized coal reaches a preset lower limit.

7. The system for improving the reliability of blast furnace pulverized coal injection as described in any one of claims 1 to 5, characterized in that, In a blast furnace system, at least one injection tank is configured as a standby injection tank connected to the injection backup pipe in another blast furnace system, while the remaining injection tanks are configured to alternately supply pulverized coal to the blast furnace body of their respective blast furnace system through the pulverized coal injection main pipe, and receive pulverized coal replenished from the pulverized coal silo after the pulverized coal reaches a preset lower limit.

8. The system for improving the reliability of blast furnace pulverized coal injection as described in claim 7, characterized in that, The backup injection tank is configured to supply pulverized coal to the blast furnace body of another blast furnace system via a backup pulverized coal injection pipe in the event of a pulverizing unit failure in that blast furnace system.

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