System and method for improving coal injection reliability of blast furnace

Abstract

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

Description

Technical Field

[0001] The present invention relates to the technical field of blast furnaces, and in particular to a system and method for improving the reliability of coal injection in blast furnaces. Background Art

[0002] Modern large-scale steel mills have multiple blast furnaces. The fuel required for blast furnace smelting production is coke pulverized coal. Each blast furnace is equipped with a pulverizing coal injection system. The blast furnaces are independent and there is no connection between the pulverizing coal injection systems. When the pulverized coal preparation and coal injection system of one blast furnace fails, if the maintenance time is too long, the blast furnace will stop injecting coal due to coal consumption and failure to replenish it in time. This "one-to-one" pulverized coal preparation and injection mode affects the continuity and reliability of pulverized coal supply for blast furnace production. Summary of the invention

[0003] The present invention is made to solve the above-mentioned technical problems. One of its purposes is to provide a system and method for improving the reliability of blast furnace coal injection, through which the continuity and reliability of coal powder supply in the blast furnace smelting production process can be improved.

[0004] According to one embodiment of the present invention, there is provided a system for improving the reliability of coal injection in a blast furnace, comprising two or more blast furnace systems, wherein the blast furnace system comprises: a blast furnace body; a pulverizing device; a pulverized coal bin connected to the pulverizing device; three groups of blowing tanks connected to the pulverized coal bin; a coal injection main pipe, one end of which is connected to the three groups of blowing tanks, and the other end is connected to the blast furnace body; a coal injection standby pipe, one end of which is connected to the three groups of blowing tanks, and the other end is connected to the coal injection main pipe in another blast furnace system.

[0005] As an embodiment, a coal discharge valve is provided on the output pipeline of the injection tank.

[0006] As an implementation mode, the front end of the output pipeline forms two branches which are respectively connected with the coal injection main pipe and the coal injection standby pipe.

[0007] As an embodiment, a cut-off valve is provided on the branch line.

[0008] As an implementation mode, a coal injection switching valve is provided on the coal injection standby pipe.

[0009] According to one embodiment of the present invention, a method for improving the reliability of coal injection in a blast furnace is provided, and the system for improving the reliability of coal injection in a blast furnace as described above is adopted, and the method comprises: each blast furnace system supplies coal powder into a coal powder bin through its own pulverizing device, and then transports it to three blowing tanks, and any one of the three blowing tanks provides coal powder to the blast furnace body through a coal injection main pipe; when the coal powder in one blowing tank reaches a preset lower limit, it is switched to another blowing tank to provide coal powder to the blast furnace body through the coal injection main pipe, and the blowing tank whose coal powder reaches the preset lower limit receives the coal powder replenished by the coal powder bin; when the pulverizing device of a blast furnace system fails, the blowing tank in another blast furnace system that is not performing coal injection operation supplies coal powder to the blast furnace body of the blast furnace system through the coal injection standby pipe.

[0010] As an embodiment, the three injection tanks sequentially supply pulverized coal to the blast furnace body of the blast furnace system through the coal injection main pipe, and receive pulverized coal replenished by the pulverized coal bin after the pulverized coal reaches a preset lower limit.

[0011] As an embodiment, among the three injection tanks, only two of them alternately provide coal powder to the blast furnace body of the blast furnace system through the coal injection main pipe, and receive coal powder replenished by the coal powder bin after the coal powder reaches a preset lower limit, and the other injection tank is a spare injection tank.

[0012] As an implementation mode, when the pulverizing device of one blast furnace system fails, a spare injection tank in another blast furnace system supplies pulverized coal to the blast furnace body in the blast furnace system through a coal injection standby pipe.

[0013] The present invention proposes a system and method for improving the reliability of coal injection in a blast furnace. The coal injection pipelines of multiple blast furnace systems can be connected together through the system. When a pulverizing device of a blast furnace system fails and requires a long time for maintenance, the pulverized coal can be input from an injection tank in another blast furnace system into the coal injection main pipe of the blast furnace system through a coal injection standby pipe, thereby ensuring that the blast furnace body in the blast furnace system can continue to operate. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 The present invention is a schematic diagram of the structure of a system for improving the reliability of coal injection in a blast furnace according to an embodiment of the present invention. DETAILED DESCRIPTION

[0015] The exemplary embodiments will now be described more fully with reference to the accompanying drawings. However, the 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 the disclosure will be more comprehensive and complete and fully convey the concepts of the 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.

[0016] In addition, the accompanying drawings are only schematic illustrations of the present disclosure and are not necessarily drawn to scale. The same reference numerals in the figures represent the same or similar parts, and thus their repeated descriptions will be omitted. It should be noted that in the present disclosure, the terms "including", "configured with", and "set in" are used to express the meaning of open-ended inclusion, and mean that in addition to the listed elements / components / etc., there may be other elements / components / etc.; the terms "first", "second", etc. are only used as marks, and are not restrictions on the number or order of their objects; the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inside", "outside", etc. indicate the orientation or position relationship based on the orientation or position relationship shown in the accompanying drawings, which is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present invention.

[0017] Unless otherwise clearly specified and limited, the terms "installed", "connected" and "connected" 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 an indirect connection 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 according to specific circumstances.

[0018] According to one embodiment of the present invention, a system for improving the reliability of coal injection in a blast furnace is provided. Figure 1 As shown, the system includes more than two blast furnace systems, each of which includes a blast furnace body, a pulverizing device, a pulverized coal bin, three groups of injection tanks, a coal injection main pipe and a coal injection standby pipe.

[0019] The blast furnace body is used for smelting operations, the pulverizing device is used to prepare the coke pulverized coal required for blast furnace smelting, and the pulverized coal bin is used to temporarily store the coke pulverized coal processed by the pulverizing device and transmit it to three groups of injection tanks, which provide pulverized coal to the blast furnace through the injection main pipe.

[0020] Specifically, the output end of the pulverizing device is connected to the input end of the pulverized coal bin through a pipeline, and the prepared coke pulverized coal can be transmitted to the pulverized coal bin in real time. The output end of the pulverized coal bin is respectively connected to the input ends of three groups of injection tanks through three branch pipelines, and pulverized coal can be supplied to each injection tank. The output end of each injection tank is connected to the coal injection main pipe and the coal injection standby pipe through a pipeline, the output end of the coal injection main pipe is connected to the blast furnace body, and the output end of the coal injection standby pipe is connected to the coal injection main pipe in another blast furnace system. The injection tank can supply pulverized coal to the blast furnace body in the blast furnace system in which it is located through the coal injection main pipe, and can also supply pulverized coal to the coal injection main pipes of other blast furnace systems through the coal injection standby pipe, so that the blast furnace bodies in other blast furnace systems will not be short of pulverized coal.

[0021] The system for improving the reliability of coal injection in blast furnaces can connect the coal injection pipelines of multiple blast furnace systems together. When the pulverizing device of a blast furnace system fails and requires a long time for maintenance, the injection tank in another blast furnace system can input coal powder into the coal injection main pipe of the blast furnace system through the coal injection spare pipe, ensuring the continuous operation of the blast furnace body in the blast furnace system.

[0022] like Figure 1 As shown, in this embodiment, a lower coal valve is provided on the output pipelines of the three injection tanks in each blast furnace system, so that the user can choose to use any of the injection tanks to inject coal powder into the blast furnace body. Two branches are formed on the output pipeline of the injection tank, which are respectively connected to the coal injection main pipe and the coal injection standby pipe, so as to independently supply coal powder to the coal injection main pipe and the coal injection standby pipe. Furthermore, a shut-off valve is also provided on the branch, so that the user can choose to supply coal powder to the coal injection main pipe or the coal injection standby pipe.

[0023] In addition, a switching valve is provided on the coal injection standby pipe to facilitate the user to operate whether to connect the coal injection main pipe and the coal injection standby pipe in the two blast furnace systems together.

[0024] When the system for improving the reliability of blast furnace coal injection is used for production operations, the following method for improving the reliability of blast furnace coal injection is used:

[0025] First, each blast furnace system supplies pulverized coal to the pulverized coal bin through its own pulverizing device, and then transports it to three injection tanks. Any of the three injection tanks supplies pulverized coal to the blast furnace body through the coal injection main pipe;

[0026] Secondly, when the pulverized coal in one injection tank reaches a preset lower limit, another injection tank is switched to supply pulverized coal to the blast furnace body through the coal injection main pipe, and the injection tank whose pulverized coal reaches the preset lower limit receives the pulverized coal supplemented by the pulverized coal bin;

[0027] Finally, when the pulverizing device of one blast furnace system fails, the pulverized coal is supplied to the blast furnace body of the blast furnace system through the coal injection standby pipe from the injection tank in another blast furnace system that is not performing coal injection operation.

[0028] Through this method, the coal injection pipelines of multiple blast furnace systems can be connected together. When the pulverizing device of a blast furnace system fails and requires a long time for maintenance, the injection tank in another blast furnace system can input coal powder into the coal injection main pipe of the blast furnace system through the coal injection spare pipe, ensuring the continuous operation of the blast furnace body in the blast furnace system.

[0029] As an implementation method, the three injection tanks sequentially supply pulverized coal to the blast furnace body of the blast furnace system through the coal injection main pipe, and receive the pulverized coal replenished by the pulverized coal bin after the pulverized coal reaches the preset lower limit. This ensures that the blast furnace body in the blast furnace system can be stably and continuously supplied with pulverized coal. The three injection tanks supply pulverized coal sequentially, which also allows sufficient time to replenish the pulverized coal in the injection tank after the pulverized coal reaches the preset lower limit.

[0030] As an implementation method, among the three blowing tanks, only two of them alternately supply coal powder to the blast furnace body of the blast furnace system through the coal injection main pipe, and receive the coal powder replenished by the coal powder bin after the coal powder reaches the preset lower limit, and the other blowing tank is a spare blowing tank. While ensuring that the blast furnace body of the blast furnace system can be stably and continuously supplied with coal powder, the two blowing tanks supply powder in sequence, which also facilitates time to replenish the coal powder into the blowing tank after the coal powder reaches the preset lower limit. The other blowing tank is a spare blowing tank, which can supply powder to the coal injection main pipe in the blast furnace system when the powder making device in other blast furnace systems fails, so that it has sufficient time to repair the powder making device, and at the same time, ensure that the blast furnace body in the blast furnace system can continue to operate.

[0031] The following takes two blast furnace systems as examples to further illustrate the above-mentioned system for improving the reliability of blast furnace coal injection and the method for improving the reliability of blast furnace coal injection.

[0032] like 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.

[0033] The first blast furnace system includes a first pulverizing device 1-15, a first pulverized coal bin 1-1, three injection tanks, respectively denoted as the first injection tank 1-2, the second injection tank 1-3, the third injection tank 1-4, the first coal injection main pipe 1-16, and the first coal injection standby pipe 1-17. A first coal lowering valve 1-5 is provided on the output end pipeline of the first injection tank 1-2, a second coal lowering valve 1-8 is provided on the output end pipeline of the second injection tank 1-3, and a third coal lowering valve 1-11 is provided on the output end pipeline of the third injection tank 1-4.

[0034] A first shut-off valve 1-6 is arranged on a branch road where the output end pipeline of the first blowing tank 1-2 is connected to the first coal injection main pipe 1-16, and a second shut-off valve 1-7 is arranged on a branch road where the output end pipeline of the first blowing tank 1-2 is connected to the first coal injection standby pipe 1-17; a third shut-off valve 1-9 is arranged on a branch road where the output end pipeline of the second blowing tank 1-3 is connected to the first coal injection main pipe 1-16, and a fourth shut-off valve 1-10 is arranged on a branch road where the output end pipeline of the second blowing tank 1-3 is connected to the first coal injection standby pipe 1-17; a fifth shut-off valve 1-12 is arranged on a branch road where the output end pipeline of the third blowing tank 1-4 is connected to the first coal injection main pipe 1-16, and a sixth shut-off valve 1-13 is arranged on a branch road where the output end pipeline of the third blowing tank 1-4 is connected to the first coal injection standby pipe 1-17. One end of the first coal injection main pipe 1-16 is connected to the first blowing tank 1-2, the second blowing tank 1-3 and the third blowing tank 1-4, and the other end of the first coal injection main pipe 1-16 is connected to the first blast furnace body 1-14, and can supply pulverized coal to the first blast furnace body 1-14. One end of the first coal injection standby pipe 1-17 is connected to the first blowing tank 1-2, the second blowing tank 1-3 and the third blowing tank 1-4, and the other end of the first coal injection standby pipe 1-17 is connected to the second coal injection main pipe 2-16 in the second blast furnace system, and can supply pulverized coal to the second coal injection main pipe 2-16 when needed.

[0035] The second blast furnace system includes a second pulverizing device 2-15, a second pulverized coal bin 2-1, three injection tanks, which are respectively recorded as the fourth injection tank 2-2, the fifth injection tank 2-3, and the sixth injection tank 2-4, the second coal injection main pipe 2-16, and the second coal injection standby pipe 2-17. A fourth lower coal valve 2-5 is provided on the output end pipeline of the fourth injection tank 2-2, a fifth lower coal valve 2-8 is provided on the output end pipeline of the fifth injection tank 2-3, and a sixth lower coal valve 2-11 is provided on the output end pipeline of the sixth injection tank 2-4.

[0036] A seventh shut-off valve 2-6 is arranged on a branch road where the output end pipeline of the fourth injection tank 2-2 is connected to the second coal injection main pipe 2-16, and an eighth shut-off valve 2-7 is arranged on a branch road where the output end pipeline of the fourth injection tank 2-2 is connected to the second coal injection standby pipe 2-17; a ninth shut-off valve 2-9 is arranged on a branch road where the output end pipeline of the fifth injection tank 2-3 is connected to the second coal injection main pipe 2-16, and a tenth shut-off valve 2-10 is arranged on a branch road where the output end pipeline of the fifth injection tank 2-3 is connected to the second coal injection standby pipe 2-17; an eleventh shut-off valve 2-12 is arranged on a branch road where the output end pipeline of the sixth injection tank 2-4 is connected to the second coal injection main pipe 2-16, and a twelfth shut-off valve 2-13 is arranged on a branch road where the output end pipeline of the sixth injection tank 2-4 is connected to the second coal injection standby pipe 2-17. One end of the second coal injection main pipe 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 of the second coal injection main pipe 2-16 is connected to the second blast furnace body 2-14, and can supply pulverized coal to the second blast furnace body 2-14. One end of the second coal injection standby 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 of the second coal injection standby pipe 2-17 is connected to the first coal injection main pipe 1-16 in the first blast furnace system, and can supply pulverized coal to the first coal injection main pipe 1-16 when needed.

[0037] When the system for improving the reliability of blast furnace coal injection is used for production operations, the following method for improving the reliability of blast furnace coal injection is used:

[0038] First, the first pulverizing device 1-15 in the first blast furnace system supplies pulverized coal to the first pulverized coal bin 1-1, and then transports it to the first blowing tank 1-2, the second blowing tank 1-3 and the third blowing tank 1-4, and then the first lower coal valve 1-5 and the first shut-off valve 1-6 are opened, and the first blowing tank 1-2 supplies pulverized coal to the first blast furnace body 1-14 through the first coal injection main pipe 1-16; the second pulverizing device 2-15 in the second blast furnace system supplies pulverized coal to the second pulverized coal bin 2-1, and then transports it to the fourth blowing tank 2-2, the fifth blowing tank 2-3 and the sixth blowing tank 2-4, and then the fourth lower coal valve 2-5 and the seventh shut-off valve 2-6 are opened, and the fourth blowing tank 2-2 supplies pulverized coal to the second blast furnace body 2-14 through the second coal injection main pipe 2-16.

[0039] Afterwards, when the pulverized coal in the first blowing tank 1-2 reaches the preset lower limit, the first lower coal valve 1-5 and the first shut-off valve 1-6 are closed, and the second lower coal valve 1-8 and the third shut-off valve 1-9 are opened at the same time, and the second blowing tank 1-3 is switched to supply pulverized coal to the first blast furnace body 1-14 through the first coal injection main pipe 1-16; when the pulverized coal in the fourth blowing tank 2-2 reaches the preset lower limit, the fourth lower coal valve 2-5 and the seventh shut-off valve 2-6 are closed, and the fifth lower coal valve 2-8 and the ninth shut-off valve 2-9 are opened at the same time, and the fifth blowing tank 2-3 is switched to supply pulverized coal to the second blast furnace body 2-14 through the second coal injection main pipe 2-16.

[0040] Finally, when the first pulverizing device 1-15 of the first blast furnace system fails, the sixth injection tank 2-4 in the second blast furnace system supplies pulverized coal to the first coal injection main pipe 1-16 and the first blast furnace body 1-14 in the first blast furnace system through the second coal injection standby pipe 2-17; or, when the second pulverizing device 2-15 of the second blast furnace system fails, the third injection tank 1-4 in the first blast furnace system supplies pulverized coal to the second coal injection main pipe 2-16 and the second blast furnace body 2-14 in the second blast furnace system through the first coal injection standby pipe 1-17.

[0041] The third injection tank 1-4 and the sixth injection tank 2-4 in this embodiment are used as spare injection tanks and do not directly participate in the coal injection operation of the blast furnace system where they are located, but are only used for coal injection operations to other blast furnace systems. Of course, in actual application, the three injection tanks in the first blast furnace system sequentially provide coal powder to the first blast furnace body 1-14 through the first coal injection main pipe 1-16, and receive the coal powder supplemented by the first coal powder bin 1-1 after the coal powder reaches the preset lower limit. Accordingly, when the second pulverizing device 2-15 fails, the three injection tanks that are not performing coal injection operations supply coal to the first coal injection standby pipe 1-17 and the second coal injection main pipe 2-16; similarly, the three injection tanks in the second blast furnace system sequentially provide coal powder to the second blast furnace body 2-14 through the second coal injection main pipe 2-16, and receive the coal powder supplemented by the second coal powder bin 2-1 after the coal powder reaches the preset lower limit. Accordingly, when the first pulverizing device 1-15 fails, the three injection tanks that are not performing coal injection operations supply coal to the second coal injection standby pipe 2-17 and the first coal injection main pipe 1-16. Both can ensure that the blast furnaces in the two blast furnace systems can continuously and stably perform smelting operations.

[0042] It will be apparent to those skilled in the art that the invention is not limited to the details of the exemplary embodiments described above and that the invention can be implemented in other specific forms without departing from the spirit or essential features of the invention. Therefore, the embodiments should be considered exemplary and non-limiting in all respects, and the scope of the invention is defined by the appended claims rather than the foregoing description, and it is intended that all variations falling within the meaning and scope of the equivalent elements of the claims be included in the invention. Any reference numeral in a claim should not be considered as limiting the claim to which it relates.

Claims

1. A system for improving the reliability of coal injection in a blast furnace, comprising two or more blast furnace systems, characterized in that: The blast furnace system comprises: Blast furnace body; Milling device; A pulverized coal bin connected to the pulverizing device; Three groups of injection tanks are connected to the pulverized coal bin; A coal injection main pipe, one end of which is connected to the three groups of injection tanks, and the other end of which is connected to the blast furnace body; A coal injection standby pipe has one end connected to the three groups of injection tanks and the other end connected to a coal injection main pipe in another blast furnace system.

2. The system for improving the reliability of coal injection in a blast furnace according to claim 1, characterized in that: A coal discharge valve is arranged on the output pipeline of the injection tank.

3. The system for improving the reliability of coal injection in a blast furnace according to claim 2, characterized in that: Two branches are formed at the front end of the output pipeline, which are respectively connected with the coal injection main pipe and the coal injection standby pipe.

4. The system for improving the reliability of coal injection in a blast furnace according to claim 3, characterized in that: A cut-off valve is provided on the branch line.

5. The system for improving the reliability of coal injection in a blast furnace according to claim 1, characterized in that: The coal injection standby pipe is provided with a coal injection switching valve.

6. A method for improving the reliability of coal injection in a blast furnace, using the system for improving the reliability of coal injection in a blast furnace as claimed in any one of claims 1 to 5, characterized in that: The method comprises: Each blast furnace system supplies pulverized coal to the pulverized coal bin through its own pulverizing device, and then transports it to three injection tanks. Any of the three injection tanks supplies pulverized coal to the blast furnace body through the coal injection main pipe; When the pulverized coal in one injection tank reaches a preset lower limit, another injection tank is switched to supply pulverized coal to the blast furnace body through the coal injection main pipe, and the injection tank whose pulverized coal reaches the preset lower limit receives the pulverized coal supplemented by the pulverized coal bin; When the pulverizing device of a blast furnace system fails, the pulverized coal is supplied to the blast furnace body of the blast furnace system through the coal injection standby pipe from the injection tank in another blast furnace system that is not performing coal injection operation.

7. The method for improving the reliability of coal injection in a blast furnace according to claim 6, characterized in that: The three injection tanks sequentially supply pulverized coal to the blast furnace body of the blast furnace system through the coal injection main pipe, and receive pulverized coal replenished by the pulverized coal bin after the pulverized coal reaches a preset lower limit.

8. The method for improving the reliability of coal injection in a blast furnace according to claim 6, characterized in that: Among the three injection tanks, only two of them alternately supply pulverized coal to the blast furnace body of the blast furnace system through the coal injection main pipe, and receive pulverized coal replenished by the pulverized coal bin after the pulverized coal reaches a preset lower limit. The other injection tank is a spare injection tank.

9. The method for improving the reliability of coal injection in a blast furnace according to claim 8, characterized in that: When the pulverizing device of one blast furnace system fails, the spare injection tank in another blast furnace system supplies pulverized coal to the blast furnace body of the blast furnace system through the coal injection standby pipe.

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