Blast furnace slag control device

Abstract

This utility model relates to a blast furnace slag flow control device, comprising a slag-forming buffer tank located below the slag trough in the tapping area, with an open top and capable of preheating and heat preservation. A slag buffer flow channel is provided within the slag-forming buffer tank. A flow-control nozzle, connected to the slag buffer flow channel and used for slag discharge, is provided at one end of the slag-forming buffer tank. The flow-control nozzle contains a flow passage and a cavity, with a cooling medium circulating within the cavity. The slag-forming buffer tank is supported on a tilting device, which is used to adjust the tilt angle of the slag-forming buffer tank. This utility model, through the cooperation of the slag-forming buffer tank, the flow-control nozzle, and the tilting device, meets the requirements of the blast furnace dry slag treatment system for stable slag flow rate, uniform and non-dispersed flow stream, prevention of slag temperature loss, and maintenance of slag fluidity.

Description

Technical Field

[0001] This utility model relates to the field of dry treatment technology for blast furnace slag, and in particular to a blast furnace slag flow control device. Background Technology

[0002] There are currently two processing methods for high-temperature slag produced in blast furnace production: water quenching and dry granulation. After slag-iron separation in the main iron trough of the tapping yard, the high-temperature slag flows into the dry slag treatment system via the slag trough. Dry slag treatment currently typically involves loading the slag into dry slag hoppers and then transferring it for further processing.

[0003] Currently, dry slag processing requires the use of dry slag hoppers to collect slag below the slag ditch at the iron tapping site, transferring the high-temperature molten slag to subsequent processing steps. This method has the following problems:

[0004] (1) The dry slag container holds high-temperature molten slag without insulation measures. During the transfer process, the heat loss is large and the temperature drop of the molten slag is too large, which will lead to insufficient glass transition rate of the product after the slag treatment, and will not meet the basic requirements of the product raw materials.

[0005] (2) When using a dry slag container to hold molten slag and then pouring it out, the slag flow is dispersed and the high-temperature molten slag splashes everywhere, which is not easy to process later.

[0006] Therefore, based on years of experience and practice in related industries, the inventor proposes a blast furnace slag flow control device to overcome the shortcomings of existing technologies. Utility Model Content

[0007] The purpose of this invention is to provide a blast furnace slag flow control device to overcome the problems of large heat loss due to lack of insulation and dispersed slag flow in the prior art. This invention, through the combination of a slag-filled buffer tank, a flow control nozzle, and a tilting device, meets the requirements of the blast furnace dry slag treatment system for stable slag flow, uniform and non-dispersed flow, ensuring no slag temperature loss, and ensuring slag fluidity.

[0008] The purpose of this utility model is achieved as follows: a blast furnace slag flow control device includes a slag-forming buffer tank located below the slag trough in the tapping area, with an open top and capable of preheating and heat preservation. A slag buffer flow channel is provided within the slag-forming buffer tank. One end of the slag-forming buffer tank is provided with a flow-control nozzle connected to the slag buffer flow channel and used for slag discharge. The flow-control nozzle has a flow passage and a cavity, and a cooling medium circulates within the cavity. The slag-forming buffer tank is supported on a tilting device, which is used to adjust the tilt angle of the slag-forming buffer tank.

[0009] In a preferred embodiment of the present invention, the top of the slag stamping buffer tank is detachably connected to a heat insulation cover.

[0010] In a preferred embodiment of the present invention, a refractory layer is provided on the inner wall of the slag stamping buffer tank, and a preheating pipe is provided in the refractory layer for preheating the refractory layer.

[0011] In a preferred embodiment of this utility model, the diameter of the flow channel gradually decreases from the slag buffer flow channel outwards.

[0012] In a preferred embodiment of the present invention, the tilting device includes a support body, a bracket is hinged to the support body, the bracket is used to support the slag stamping buffer tank from the bottom, and the support body is provided with a drive structure that can drive the bracket to rotate to change the tilt angle of the slag stamping buffer tank.

[0013] In a preferred embodiment of the present invention, a weighing unit is provided on the tilting device, and the weighing unit is used to monitor the amount of slag in the slag-forming buffer tank.

[0014] In a preferred embodiment of the present invention, a cooling structure is provided on the tilting device, and the cooling structure is used to cool the tilting device.

[0015] In a preferred embodiment of the present invention, the driving structure includes a hydraulic cylinder hinged to the bracket body. The hydraulic cylinder includes a cylinder barrel and a cylinder rod, the cylinder rod being hinged to the bracket, and the cylinder barrel being hinged to the bracket body.

[0016] In a preferred embodiment of the present invention, the heat insulation cover is hinged to a movable cover support frame, and the cover support frame can be positioned above the slag stamping buffer tank.

[0017] In a preferred embodiment of the present invention, the bottom of the slag stamping buffer tank is provided with a flat bottom structure or a round bottom structure.

[0018] As described above, the blast furnace slag flow control device of this utility model has the following beneficial effects:

[0019] In this utility model of blast furnace slag flow control device, the slag rushing buffer tank heats and buffers the slag from the slag trough of the tapping area, and the slag flow is gathered by the flow control nozzle, so that it enters the next process more evenly; the flow control nozzle has a cavity inside, and the cavity is filled with circulating cooling liquid to protect the safe use of the flow control nozzle; the tilting device can adapt to the tilt angle of the slag rushing buffer tank according to the slag output, so that the slag output is kept within a reasonable range.

[0020] This invention meets the requirements of blast furnace dry slag treatment systems for stable molten slag flow, uniform and non-dispersed slag stream, prevention of slag temperature loss, and preservation of slag fluidity. The system is simple to control and easy to maintain. Attached Figure Description

[0021] The following figures are intended only to illustrate and explain the present invention and do not limit the scope of the present invention. Wherein:

[0022] Figure 1 This is a schematic diagram of the blast furnace slag flow control device of this utility model without the heat insulation cover.

[0023] Figure 2 This is a schematic diagram of the blast furnace slag flow control device of this utility model when the heat insulation cover is attached.

[0024] Figure 3 This is a schematic diagram of the slag stamping buffer tank of this utility model.

[0025] Figure 4 This is a schematic diagram of the flow control nozzle of this utility model.

[0026] Figure 5 This is a schematic diagram of the tilting device of this utility model.

[0027] In the picture:

[0028] 1. Slag-forming buffer tank; 11. Slag buffer flow channel; 12. Refractory layer;

[0029] 2. Flow control nozzle; 21. Flow passage; 22. Cavity;

[0030] 3. Tilting device; 31. Support body; 32. Bracket; 33. Drive structure;

[0031] 4. Heat insulation cover; 41. Cover support frame. Detailed Implementation

[0032] To provide a clearer understanding of the technical features, objectives, and effects of this utility model, the specific embodiments of this utility model are now described with reference to the accompanying drawings.

[0033] The specific embodiments of the present invention described herein are for illustrative purposes only and should not be construed as limiting the present invention in any way. Under the teachings of this invention, those skilled in the art can conceive of any possible modifications based on this invention, and these should all be considered within the scope of this invention. It should be noted that when an element is referred to as being "set on" another element, it can be directly on the other element or there may be an intervening element. When an element is considered to be "connected" to another element, it can be directly connected to the other element or there may be an intervening element. The terms "mounted," "connected," and "linked" should be interpreted broadly; for example, they can refer to mechanical or electrical connections, or internal connections between two elements, and can be direct or indirect connections through an intermediate medium. Those skilled in the art can understand the specific meaning of the above terms according to the specific circumstances. The terms "vertical," "horizontal," "upper," "lower," "left," "right," and similar expressions used herein are for illustrative purposes only and do not represent the only possible embodiments.

[0034] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs. The terminology used herein in the specification of this application is for the purpose of describing particular embodiments only and is not intended to be limiting of the application. The term "and / or" as used herein includes any and all combinations of one or more of the associated listed items.

[0035] like Figures 1 to 5 As shown, this utility model provides a blast furnace slag flow control device, including a slag-forming buffer tank 1 located below the slag trough in the tapping area, with an open top and capable of preheating and heat preservation. The slag-forming buffer tank 1 is provided with a slag buffer flow channel 11 (with certain storage and flow functions). One end of the slag-forming buffer tank 1 is provided with a flow control nozzle 2 connected to the slag buffer flow channel 11 and used for slag discharge. The flow control nozzle 2 is provided with a flow channel 21 and a cavity 22, and a cooling medium circulates in the cavity 22. The slag-forming buffer tank 1 is supported on a tilting device 3, which is used to adjust the tilt angle of the slag-forming buffer tank 1 to change the amount of slag discharged.

[0036] The blast furnace slag flow control device of this invention is installed below the slag trough (existing technology) in the tapping area. High-temperature molten slag flows into the slag flushing buffer tank 1 and flows through the slag buffer flow channel 11 pre-set inside the tank to the flow control nozzle 2. After being gathered by the flow control nozzle 2, the molten slag flow can enter the next process more evenly. In its initial state, the tilting device 3 keeps the slag flushing buffer tank 1 at a certain angle, allowing the molten slag to flow out quickly. As the blast furnace tapping time increases and the slag volume gradually increases, in order to ensure the smooth processing of molten slag in subsequent processes, the tilting device 3 is gradually lowered, reducing the tilt angle of the slag flushing buffer tank 1. A certain amount of molten slag can be stored in the slag flushing buffer tank 1. After the slag volume returns to the normal processing volume, the tilting device 3 is gradually raised to empty the stored molten slag.

[0037] In this utility model of blast furnace slag flow control device, the slag rushing buffer tank 1 buffers and stores the slag from the slag ditch of the tapping area, and the flow control nozzle 2 gathers the slag flow so that it enters the next process more evenly; the flow control nozzle 2 has a cavity 22 inside, and the cavity 22 is filled with circulating cooling liquid to protect the safe use of the flow control nozzle 2; the tilting device 3 can adapt to the slag discharge rate to adjust the tilt angle of the slag rushing buffer tank 1 so that the slag discharge rate is kept within a reasonable range.

[0038] This invention meets the requirements of blast furnace dry slag treatment systems for stable slag flow, uniform and non-dispersed slag flow, ensuring no slag temperature loss, and ensuring slag fluidity.

[0039] This utility model system is simple to control and easy to maintain.

[0040] Furthermore, such as Figure 2 As shown, a heat insulation cover 4 is detachably connected to the top of the slag-forming buffer tank 1. The heat insulation cover 4 itself can be heated and preheated. When the slag-forming buffer tank 1 is used for slag buffering, the heat insulation cover 4 is placed on the slag-forming buffer tank 1 and preheats itself (ensuring the ambient temperature at the top opening of the slag-forming buffer tank 1), reducing heat loss from the slag and preventing the slag from losing a lot of temperature and reducing its fluidity during temporary storage. The heat insulation cover 4 can both reduce heat loss from the slag and collect dust pollution caused by falling slag. When the slag-forming buffer tank 1 of the device is used for slag flow control (continuous slag flow), the heat insulation cover 4 is removed and not used.

[0041] Furthermore, such as Figure 3 As shown, the inner wall of the slag flushing buffer tank 1 is provided with a refractory layer 12 (a refractory material is laid to form the refractory layer), and a preheating pipe is installed inside the refractory layer 12 for preheating the refractory layer 12. Before the slag flushing operation begins, the refractory layer 12 is preheated to reduce heat loss when the slag falls into the tank and to prevent the slag from losing fluidity due to low temperature.

[0042] Furthermore, such as Figure 4 As shown, the diameter of the flow channel 21 of the flow control nozzle 2 gradually decreases from the slag buffer flow channel 11 outwards.

[0043] Furthermore, such as Figure 5 As shown, the tilting device 3 includes a support body 31, a bracket 32 ​​is hinged on the support body 31, the bracket 32 ​​is used to support the molten slag stamping buffer tank 1 from the bottom, and a drive structure 33 is provided on the support body 31 to drive the bracket 32 ​​to rotate so as to change the tilt angle of the molten slag stamping buffer tank 1.

[0044] Furthermore, a weighing unit (which can be a weighing sensor from the prior art) is installed on the tilting device 3. The weighing unit is used to monitor the amount of molten slag in the molten slag pouring buffer tank 1. When the amount of molten slag discharged exceeds the set value, the weighing unit can send a signal, and the tilting device 3 can be adjusted according to the signal to change the tilt angle of the molten slag pouring buffer tank 1.

[0045] Furthermore, a cooling structure (a conventional cooling water circulation structure can be used) is provided on the tilting device 3. The cooling structure is used to cool down the tilting device, protect the tilting device to ensure safe use, and prevent the tilting device from operating at too high a temperature, which would shorten its service life.

[0046] Furthermore, such as Figure 5 As shown, the drive structure 33 includes a hydraulic cylinder hinged to the bracket body 31. The hydraulic cylinder includes a cylinder barrel and a cylinder rod. The cylinder rod is hinged to the bracket 32, and the cylinder barrel is hinged to the bracket body 31.

[0047] Furthermore, such as Figure 2 As shown, the heat insulation cover 4 is hinged to a movable cover support frame 41, which spans above the slag stamping buffer tank 1. By moving the cover support frame 41, the heat insulation cover 4 can be easily moved and stably supported.

[0048] Furthermore, the bottom of the slag stamping buffer tank 1 is set with a flat bottom structure or a round bottom structure, or it can be other structural forms.

[0049] Example: When the blast furnace meets the tapping conditions, the operator sends a control signal to the slag flushing control room (existing technology) to begin slag handling operations. The molten slag enters the molten slag flushing buffer tank 1 located below the slag flushing ditch in the tapping area.

[0050] When the amount of slag is small in the early stage of production and the subsequent equipment has sufficient processing capacity, the tilting device 3 is raised to a preset angle, and the molten slag enters the molten slag flushing buffer tank 1 and can flow directly into the subsequent equipment through the flow control nozzle 2.

[0051] When the amount of molten slag discharged increases (the information on the amount of molten slag can come from signals sent by production personnel, signals from the weighing unit set on the tilting device 3, or signals from subsequent equipment), the tilting device 3 lowers its height, and the tilt angle of the molten slag flushing buffer tank 1 decreases, so that the molten slag can be stored in the molten slag flushing buffer tank 1 for a certain period of time. When the emptying signal is received, the tilting device 3 rises and discharges the molten slag buffered in the molten slag flushing buffer tank 1.

[0052] All molten slag flows through the flow control nozzle 2, forming a stable, constricted slag flow, which facilitates subsequent processing.

[0053] The heat insulation cover 4 is used to buffer molten slag in the slag-filling buffer tank 1 when there is no need for overflow and slag discharge. Before each operation, it is placed on the slag-filling buffer tank 1, and the heat insulation cover 4 itself is preheated (to ensure the ambient temperature above the molten slag in the slag-filling buffer tank 1 and to isolate the heat dissipated outwards) to better ensure that the molten slag does not lose temperature and to ensure the fluidity of the molten slag. When the molten slag flows continuously, the heat insulation cover 4 is removed and not used.

[0054] The above description is merely an illustrative embodiment of this utility model and is not intended to limit the scope of this utility model. Any equivalent changes and modifications made by those skilled in the art without departing from the concept and principles of this utility model should fall within the protection scope of this utility model.

Claims

1. A blast furnace slag flow control device, characterized in that, The system includes a slag-forming buffer tank located below the slag trough in the iron tapping area, with an open top and capable of preheating and heat preservation. The slag-forming buffer tank contains a slag buffer flow channel. One end of the slag-forming buffer tank is equipped with a flow-control nozzle connected to the slag buffer flow channel and used for slag discharge. The flow-control nozzle contains a flow passage and a cavity, with a cooling medium circulating within the cavity. The slag-forming buffer tank is supported on a tilting device, which is used to adjust the tilt angle of the slag-forming buffer tank.

2. The blast furnace slag flow control device as described in claim 1, characterized in that, The top of the slag-forming buffer tank is detachably connected to a heat insulation cover.

3. The blast furnace slag flow control device as described in claim 1, characterized in that, The inner wall of the slag stamping buffer tank is provided with a refractory layer, and a preheating pipe is provided in the refractory layer for preheating the refractory layer.

4. The blast furnace slag flow control device as described in claim 1, characterized in that, The diameter of the flow channel gradually decreases outward from the slag buffer flow channel.

5. The blast furnace slag flow control device as described in claim 1, characterized in that, The tilting device includes a support body with a bracket hinged to it. The bracket is used to support the slag stamping buffer tank from the bottom. The support body is provided with a drive structure that can drive the bracket to rotate to change the tilt angle of the slag stamping buffer tank.

6. The blast furnace slag flow control device as described in claim 5, characterized in that, The tilting device is equipped with a weighing unit, which is used to monitor the amount of slag in the slag-forming buffer tank.

7. The blast furnace slag flow control device as described in claim 5, characterized in that, The tilting device is equipped with a cooling structure, which is used to cool the tilting device.

8. The blast furnace slag flow control device as described in claim 5, characterized in that, The drive structure includes a hydraulic cylinder hinged to the bracket body. The hydraulic cylinder includes a cylinder barrel and a cylinder rod. The cylinder rod is hinged to the bracket, and the cylinder barrel is hinged to the bracket body.

9. The blast furnace slag flow control device as described in claim 2, characterized in that, The heat insulation cover is hinged to a movable cover support frame, which can be positioned above the slag stamping buffer tank.

10. The blast furnace slag flow control device as described in claim 1, characterized in that, The bottom of the slag stamping buffer tank is either flat or round.

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