Coal injection control device

Abstract

The invention belongs to the technical field of blast furnace coal injection, and particularly relates to a coal injection control device. The coal injection control device comprises a distributor; one end of each conveying pipeline is communicated with the distributor, and the other end is communicated with the blast furnace; the conveying pipeline comprises a first pipe, a second pipe and at least two third pipes capable of being connected and disconnected, the first pipe is communicated with the distributor, the second pipe is communicated with the blast furnace, the at least two third pipes are communicated with the first pipe and the second pipe, and each third pipe is provided with a loss resistance pipe; wherein the inner diameters of the at least two loss resistance pipes are different.

Description

Technical Field

[0001] The present application belongs to the technical field of blast furnace coal injection, and specifically relates to a coal injection control device. Background Art

[0002] The blast furnace coal injection process is based on the distance between the pulverizing device and the blast furnace, the differences in the placement of the pulverized coal bin and the injection tank, the thickness of the injection pipeline, the level of the injection pressure, the size of the conveying concentration and the type of the spray gun. In the powder pipeline pneumatic conveying process, when it is necessary to adjust the pipeline resistance loss, such as the blast furnace coal powder injection from the injection tank or distributor to the sub-pipes (6 to 50 sub-pipes) of each tuyere of the blast furnace, the resistance loss is different due to the different path lengths, and it is impossible to ensure that each tuyere of the blast furnace receives the same coal injection amount. Summary of the Invention

[0003] In order to solve the above technical problems, the present invention provides a coal injection control device, which aims to at least solve the technical problem of not being able to ensure that each tuyere of the blast furnace obtains the same coal injection amount to a certain extent.

[0004] The technical solution of the present invention is:

[0005] A coal injection control device comprises: a distributor; a plurality of conveying pipes, one end of which is connected to the distributor and the other end is connected to the blast furnace; the conveying pipes comprise: a first pipe, a second pipe and at least two switchable third pipes, the first pipe being connected to the distributor, the second pipe being connected to the blast furnace, at least two of the third pipes being connected to the first pipe and the second pipe, each of the third pipes being provided with a loss-stop tube; wherein the inner diameters of at least two of the loss-stop tubes are different.

[0006] In some embodiments, the number of the third tubes is two, and the two third tubes include a switchable first sub-tube and a switchable second sub-tube. The number of the loss-stop tubes is two, and the two loss-stop tubes include: a first loss-stop tube and a second loss-stop tube; the first loss-stop tube is arranged in the first sub-tube; the second loss-stop tube is arranged in the second sub-tube; wherein the inner diameter of the first loss-stop tube is larger than the inner diameter of the second loss-stop tube.

[0007] In some embodiments, a pressure sensor is provided at the distributor; when the pressure value detected by the pressure sensor is less than a first set pressure value, the first sub-tube is closed and the second sub-tube is opened; when the pressure value detected by the pressure sensor is greater than or equal to the first set pressure value and less than or equal to the second set pressure value, the first sub-tube is opened and the second sub-tube is closed; when the pressure value detected by the pressure sensor is greater than the second set pressure value, the first sub-tube is opened and the second sub-tube is opened.

[0008] In some embodiments, a first pneumatic ball valve is provided on the first sub-tube, and the first pneumatic ball valve is located between the first loss-stop tube and the first tube; a second pneumatic ball valve is provided on the second sub-tube, and the second pneumatic ball valve is located between the second loss-stop tube and the first tube.

[0009] In some embodiments, a third pneumatic ball valve is provided on the first sub-tube, and the third pneumatic ball valve is located between the first damage-resistant tube and the second tube; a fourth pneumatic ball valve is provided on the second sub-tube, and the fourth pneumatic ball valve is located between the second damage-resistant tube and the second tube.

[0010] In some embodiments, a fifth pneumatic ball valve is provided on the first tube.

[0011] In some embodiments, the coal injection control device further includes: a blockage detection assembly connected to the first pipe and the second pipe.

[0012] In some embodiments, the blockage detection assembly includes: a purge pipe connected to the first pipe; and a material flow detector connected to the second pipe.

[0013] In some embodiments, the coal injection control device further includes: a coal gun connected to the outlet of the second pipe and the blast furnace.

[0014] In some embodiments, the inner wall of the loss-stop tube is provided with a wear-resistant layer.

[0015] The beneficial effects of the present invention include at least:

[0016] Since one end of multiple conveying pipes is connected to the distributor and the other end is connected to the blast furnace, the conveying pipes include: a first pipe, a second pipe and at least two switchable third pipes. The first pipe is connected to the distributor, the second pipe is connected to the blast furnace, and at least two third pipes are connected to the first pipe and the second pipe. Each third pipe is provided with a loss-blocking pipe, and the inner diameters of at least two loss-blocking pipes are different. Therefore, when coal powder is to be transported to the blast furnace, the coal powder can enter the blast furnace through the distributor and multiple conveying pipes in turn. When the amount of coal powder transported to the blast furnace by each conveying pipe is to be adjusted, one or more of the at least two third pipes can be selected to be switched on or off according to the inner diameter of the loss-blocking pipe on each third pipe. The coal powder conveying resistance of each conveying pipe can be adjusted so that the resistance loss of each conveying pipe is the same, thereby ensuring uniform distribution of coal powder and ensuring that each tuyere in the blast furnace obtains the same amount of coal injection. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] In order to more clearly illustrate the technical solutions in the embodiments of the present application, a brief introduction will be given below to the drawings required for use in the description of the embodiments. Obviously, the drawings described below are some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without any creative work.

[0018] Figure 1 Schematic diagram of the structure of coal injection control device in some embodiments.

[0019] In the attached figure:

[0020] Dispenser 10;

[0021] Delivery pipeline 20, first pipe 21, second pipe 22, third pipe 23, first sub-pipe 231, second sub-pipe 232, first pneumatic ball valve 233, second pneumatic ball valve 234, third pneumatic ball valve 235, fourth pneumatic ball valve 236, damage resistance pipe 24, first damage resistance pipe 241, second damage resistance pipe 242, fifth pneumatic ball valve 25;

[0022] Blast furnace 30;

[0023] Blockage detection assembly 40, purge pipe 41, material flow detector 42;

[0024] Coal gun 50. DETAILED DESCRIPTION

[0025] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. All other embodiments obtained by ordinary technicians in this field based on the embodiments of the present invention without making any creative efforts shall fall within the scope of protection of the present invention.

[0026] It should be noted that all directional indications in the embodiments of the present invention are only used to explain the relative position relationship and movement status of various components in a certain specific posture. If the specific posture changes, the directional indication will also change accordingly.

[0027] In the present invention, unless otherwise specified or limited, the terms "connection" and "fixation" should be understood in a broad sense. For example, "fixation" can mean fixed connection, detachable connection, or integration; mechanical connection or electrical connection; direct connection or indirect connection through an intermediate medium; internal communication between two elements or interaction between two elements, unless otherwise specified. Those skilled in the art will be able to understand the specific meanings of the above terms in the present invention based on specific circumstances.

[0028] In addition, in the present invention, descriptions such as "first" and "second" are for descriptive purposes only and should not be understood as indicating or implying their relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include at least one of such features. In addition, the technical solutions between the various embodiments can be combined with each other, but this must be based on the fact that they can be implemented by ordinary technicians in this field. When the combination of technical solutions is contradictory or cannot be implemented, it should be deemed that such combination of technical solutions does not exist and is not within the scope of protection required by the present invention.

[0029] The present application is described below with reference to specific embodiments and with reference to the accompanying drawings:

[0030] The coal injection control device provided in this embodiment is intended to at least to some extent solve the technical problem of being unable to ensure that each tuyere in a blast furnace obtains the same coal injection amount.

[0031] Figure 1 Schematic diagram of the structure of the coal injection control device in some embodiments. Figure 1 The coal injection control device of the embodiment of the present application includes: a distributor 10 and multiple delivery pipes 20. One end of the multiple delivery pipes 20 is connected to the distributor 10, and the other end is connected to the blast furnace 30. The delivery pipes 20 include: a first pipe 21, a second pipe 22, and at least two switchable third pipes 23. The first pipe 21 is connected to the distributor 10, the second pipe 22 is connected to the blast furnace 30, and at least two third pipes 23 are connected to the first pipe 21 and the second pipe 22. Each third pipe 23 is provided with a loss-stop tube 24. At least two of the loss-stop tubes 24 have different inner diameters.

[0032] Since one end of the multiple conveying pipes 20 is connected to the distributor 10 and the other end is connected to the blast furnace 30, the conveying pipes 20 include: a first pipe 21, a second pipe 22 and at least two switchable third pipes 23, the first pipe 21 is connected to the distributor 10, the second pipe 22 is connected to the blast furnace 30, at least two third pipes 23 are connected to the first pipe 21 and the second pipe 22, each third pipe 23 is provided with a loss-stop pipe 24, and the inner diameters of at least two loss-stop pipes 24 are different. Therefore, when the pulverized coal is to be conveyed to the blast furnace 30, the pulverized coal The pulverized coal can enter the blast furnace 30 through the distributor 10 and multiple conveying pipes 20 in sequence. When the amount of pulverized coal transported to the blast furnace 30 by each conveying pipe 20 needs to be adjusted, the inner diameter of the loss-reducing pipe 24 on each third pipe 23 can be used to select one or more of at least two third pipes 23 to be opened or closed. The pulverized coal conveying resistance of each conveying pipe 20 can be adjusted so that the resistance loss of each conveying pipe 20 is the same, ensuring that the pulverized coal is evenly distributed, so as to ensure that each tuyere of the blast furnace 30 obtains the same amount of coal injection.

[0033] When the damage resistance tube 24 in use is worn, the third tube 23 of the worn damage resistance tube 24 can be closed, and the unused third tube 23 can be opened at the same time to achieve switching and replacement without stopping the machine.

[0034] Combine Figure 1 In some embodiments, to adjust the pulverized coal conveying resistance of the conveying pipeline 20, two third tubes 23 are provided, each comprising a switchable first sub-tube 231 and a switchable second sub-tube 232. Two damage-resistant tubes 24 are provided, each comprising a first damage-resistant tube 241 and a second damage-resistant tube 242. The first damage-resistant tube 241 is provided in the first sub-tube 231. The second damage-resistant tube 242 is provided in the second sub-tube 232. The inner diameter of the first damage-resistant tube 241 is larger than that of the second damage-resistant tube 242.

[0035] When the amount of pulverized coal transported to the blast furnace 30 by each conveying pipeline 20 needs to be adjusted, the first sub-pipe 231 and / or the second sub-pipe 232 are opened or closed, so that the first loss-reducing pipe 241 and / or the second loss-reducing pipe 242 can adjust the pulverized coal transport resistance of the first sub-pipe 231 and / or the second sub-pipe 232, thereby realizing the adjustment of the pulverized coal transport resistance of the conveying pipeline 20, so that the resistance loss of each conveying pipeline 20 is the same, ensuring uniform distribution of pulverized coal, and ensuring that each tuyere of the blast furnace 30 obtains the same amount of coal injection.

[0036] In some embodiments, when production conditions require a low pulverized coal injection rate, a single-channel loss-stop pipe can be used for transport. In this case, the second sub-pipe 232 is opened and the first sub-pipe 231 is closed, allowing the pulverized coal to enter the second pipe 22 through the second loss-stop pipe 242. This is suitable for conditions where the blast furnace 30 has a low load and a stable and low pulverized coal injection rate requirement.

[0037] In some embodiments, when production conditions require a moderate amount of pulverized coal injection, a single-channel loss-stop pipe can be used. In this case, the second sub-pipe 232 is closed and the first sub-pipe 231 is opened, allowing the pulverized coal to enter the second pipe 22 through the first loss-stop pipe 241. This is suitable for conditions where the blast furnace 30 has a moderate load and a stable and moderate demand for pulverized coal injection.

[0038] In some embodiments, if production requires increased coal injection rates, a dual-channel, loss-stop tube parallel delivery mode can be employed. Opening the second sub-tube 232 and the first sub-tube 231 allows the pulverized coal to pass through the first loss-stop tube 241 and the second loss-stop tube 242 and into the second tube 22. This mode increases the delivery area and flow rate, effectively preventing the problem of foreign matter clogging the spray gun in a large-diameter single loss-stop tube. It also improves the poor delivery stability of a single loss-stop tube, meeting the coal injection rate requirements under higher blast furnace loads.

[0039] In some embodiments, to ensure uniform distribution of pulverized coal, a pressure sensor is provided at the distributor 10. When the pressure value detected by the pressure sensor is less than a first set pressure value, the first sub-tube 231 is closed and the second sub-tube 232 is opened, allowing the pulverized coal to enter the second tube 22 through the second loss-stop tube 242. When the pressure value detected by the pressure sensor is greater than or equal to the first set pressure value and less than or equal to the second set pressure value, the first sub-tube 231 is opened and the second sub-tube 232 is closed, allowing the pulverized coal to enter the second tube 22 through the first loss-stop tube 241. When the pressure value detected by the pressure sensor is greater than the second set pressure value, the first sub-tube 231 is opened and the second sub-tube 232 is opened, allowing the pulverized coal to enter the second tube 22 through the first loss-stop tube 241 and the second loss-stop tube 242.

[0040] In some embodiments, the first set pressure value may be 9 bar, and the second set pressure value may be 10 bar.

[0041] Combine Figure 1 In some embodiments, to control the flow of the first and second sub-tubes 231 and 232, a first pneumatic ball valve 233 is provided on the first sub-tube 231. The first pneumatic ball valve 233 is located between the first resistance tube 241 and the first tube 21, and the flow of the first sub-tube 231 is controlled by the first pneumatic ball valve 233. A second pneumatic ball valve 234 is provided on the second sub-tube 232. The second pneumatic ball valve 234 is located between the second resistance tube 242 and the first tube 21, and the flow of the second sub-tube 232 is controlled by the second pneumatic ball valve 234.

[0042] In some embodiments, a wear-resistant layer is provided on the inner lining of the first pneumatic ball valve 233 and the second pneumatic ball valve 234 to ensure the service life of the first pneumatic ball valve 233 and the second pneumatic ball valve 234. The wear-resistant layer may be made of ceramic.

[0043] Combine Figure 1 In some embodiments, to facilitate maintenance or replacement of the first and second resistance tubes 241 and 242, a third pneumatic ball valve 235 is provided on the first sub-tube 231. The third pneumatic ball valve 235 is located between the first resistance tube 241 and the second tube 22. A fourth pneumatic ball valve 236 is provided on the second sub-tube 232. The fourth pneumatic ball valve 236 is located between the second resistance tube 242 and the second tube 22.

[0044] When the first damage-resistant tube 241 is to be repaired or replaced, the first pneumatic ball valve 233 and the third pneumatic ball valve 235 are closed to facilitate removal of the first damage-resistant tube 241 from the first sub-tube 231, thereby preventing leakage of pulverized coal in the first sub-tube 231. When the second damage-resistant tube 242 is to be repaired or replaced, the second pneumatic ball valve 234 and the fourth pneumatic ball valve 236 are closed to facilitate removal of the second damage-resistant tube 242 from the second sub-tube 232, thereby preventing leakage of pulverized coal in the second sub-tube 232.

[0045] In some embodiments, a wear-resistant layer is provided on the inner lining of the third pneumatic ball valve 235 and the fourth pneumatic ball valve 236 to ensure the service life of the third pneumatic ball valve 235 and the fourth pneumatic ball valve 236. The wear-resistant layer may be made of ceramic.

[0046] Combine Figure 1 In some embodiments, in order to control the on-off of the first tube 21 , a fifth pneumatic ball valve 25 is provided on the first tube 21 , and the on-off of the first tube 21 is controlled by the fifth pneumatic ball valve 25 .

[0047] In some embodiments, a wear-resistant layer is provided on the inner lining of the fifth pneumatic ball valve 25 to ensure the service life of the fifth pneumatic ball valve 25. The wear-resistant layer may be made of ceramic.

[0048] In some embodiments, in order to detect whether the delivery pipe 20 is blocked, the coal injection control device further includes a blockage detection component 40 . The blockage detection component 40 is in communication with the first pipe 21 and the second pipe 22 .

[0049] Combine Figure 1 In some embodiments, to detect whether the conveying pipeline 20 is blocked, the blockage detection assembly 40 includes a purge pipe 41 and a material flow detector 42. The purge pipe 41 is connected to the first pipe 21. The material flow detector 42 is connected to the second pipe 22. The material flow detector 42 can be a microwave material flow detector.

[0050] The material flow detector 42 is used to detect the flow state of the material in the second pipe 21 to determine whether the conveying pipeline 20 is blocked. If blocked, the first pipe 21 is closed and gas is introduced into the first pipe 21 through the purge pipe 41 for cleaning.

[0051] In some embodiments, to inject pulverized coal into the blast furnace 30 , the coal injection control device further includes a coal gun 50 . The coal gun 50 is connected to the outlet of the second pipe 22 and the blast furnace 30 . The pulverized coal delivered from the second pipe 22 is injected into the blast furnace 30 through the coal gun 50 .

[0052] In some embodiments, in order to ensure the service life of the damage-stopping tube 24, the inner wall of the damage-stopping tube 24 is provided with a wear-resistant layer.

[0053] In some embodiments, the first tube 21 and the second tube 22 may be made of stainless steel with a pressure resistance of 4 MPa to ensure the service life of the first tube 21 and the second tube 22 .

[0054] In the description of the present application, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise" and the like to indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present application.

[0055] In addition, the descriptions of "first", "second", etc. in this application are for descriptive purposes only and should not be understood as indicating or implying their relative importance or implicitly indicating the number of the technical features indicated. Therefore, the features defined as "first" or "second" may explicitly or implicitly include at least one of such features. In addition, the technical solutions between the various embodiments can be combined with each other, but this must be based on the fact that they can be implemented by ordinary technicians in this field. When the combination of technical solutions is contradictory or cannot be implemented, it should be deemed that such combination of technical solutions does not exist and is not within the scope of protection required by this application.

[0056] In the description of the present invention, unless otherwise expressly specified or limited, a first feature being "above" or "below" a second feature may include the first and second features being in direct contact, or may include the first and second features being in contact not directly but through another feature between them. Moreover, a first feature being "above," "above," and "above" a second feature includes the first feature being directly above and obliquely above the second feature, or simply indicates that the first feature is higher in level than the second feature. A first feature being "below," "below," and "below" a second feature includes the first feature being directly below and obliquely below the second feature, or simply indicates that the first feature is lower in level than the second feature.

[0057] In the description of this specification, the reference terms "one embodiment", "some embodiments", "example", "specific example", or "some examples" mean that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present application. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in any one or more embodiments or examples in a suitable manner. In addition, those skilled in the art can combine and combine different embodiments or examples described in this specification.

[0058] Although the preferred embodiments of the present application have been described, those skilled in the art may make additional changes and modifications to these embodiments once they have learned the basic creative concept. Therefore, the appended claims are intended to be interpreted as including the preferred embodiments and all changes and modifications that fall within the scope of the present application.

[0059] Obviously, those skilled in the art may make various changes and modifications to this application without departing from the spirit and scope of this application. Thus, if these modifications and variations of this application fall within the scope of the claims of this application and their equivalents, this application is intended to include these modifications and variations.

Claims

1. A coal injection control device, characterized in that: include: Allocator; a plurality of conveying pipes, one end of which is connected to the distributor and the other end of which is connected to the blast furnace; The conveying pipeline includes: a first pipe, a second pipe and at least two switchable third pipes, the first pipe is connected to the distributor, the second pipe is connected to the blast furnace, at least two third pipes are connected to the first pipe and the second pipe, and each third pipe is provided with a loss-blocking pipe; Wherein, at least two of the loss-reducing tubes have different inner diameters.

2. The coal injection control device according to claim 1, characterized in that: There are two third tubes, and the two third tubes include a switchable first sub-tube and a switchable second sub-tube. There are two loss-blocking tubes, and the two loss-blocking tubes include a first loss-blocking tube and a second loss-blocking tube. The first loss-stopping tube is provided on the first sub-tube; The second loss-blocking tube is provided on the second sub-tube; Wherein, the inner diameter of the first loss-stop tube is greater than the inner diameter of the second loss-stop tube.

3. The coal injection control device according to claim 2, characterized in that: The distributor is provided with a pressure sensor; When the pressure value detected by the pressure sensor is lower than a first set pressure value, the first sub-tube is closed and the second sub-tube is opened; When the pressure value detected by the pressure sensor is greater than or equal to the first set pressure value and less than or equal to the second set pressure value, the first sub-tube is opened and the second sub-tube is closed; When the pressure value detected by the pressure sensor is greater than the second set pressure value, the first sub-tube is opened and the second sub-tube is opened.

4. The coal injection control device according to claim 2, characterized in that: A first pneumatic ball valve is provided on the first sub-pipe, and the first pneumatic ball valve is located between the first loss-stopping pipe and the first pipe; A second pneumatic ball valve is provided on the second sub-tube, and the second pneumatic ball valve is located between the second loss-stop tube and the first tube.

5. The coal injection control device according to claim 2, characterized in that: A third pneumatic ball valve is provided on the first sub-tube, and the third pneumatic ball valve is located between the first loss-stop tube and the second tube; The second sub-tube is provided with a fourth pneumatic ball valve, and the fourth pneumatic ball valve is located between the second loss-stop tube and the second tube.

6. The coal injection control device according to any one of claims 1 to 5, characterized in that: A fifth pneumatic ball valve is provided on the first pipe.

7. The coal injection control device according to any one of claims 1 to 5, characterized in that: The coal injection control device also includes: The blockage detection component is connected to the first tube and the second tube.

8. The coal injection control device according to claim 7, characterized in that: The blockage detection component includes: a purge pipe, connected to the first pipe; The material flow detector is communicated with the second pipe.

9. The coal injection control device according to any one of claims 1 to 5, characterized in that: The coal injection control device also includes: A coal gun is connected to the outlet of the second pipe and the blast furnace.

10. The coal injection control device according to any one of claims 1 to 5, characterized in that: The inner wall of the damage-resistant tube is provided with a wear-resistant layer.

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