Blast furnace slag double-runner gate valve switching device

Abstract

The utility model relates to the field of waste heat recovery, in particular to a blast furnace slag double-runner gate valve switching device. A plurality of tap holes are formed in the blast furnace; the blast furnace slag runners are correspondingly connected with the tap holes, and are communicated with one another through communicating slag runners; the middle slag ladle is connected with the blast furnace slag runner; and the flashboard mechanisms are arranged on the blast furnace slag runner and the communicating slag channel. According to the device, the blast furnace slag is conveyed to the middle slag ladle through the multiple blast furnace slag runners, the middle slag ladle is used for granulating the blast furnace slag through the blast furnace slag jet granulating device, and when one blast furnace slag runner goes wrong or needs to be maintained, the blast furnace slag runner can be manually or automatically switched to another blast furnace slag runner to supply slag to the middle slag ladle; it is guaranteed that stable and reliable molten blast furnace slag can be provided for the blast furnace slag granulation device, the reliability of a recovery system is improved, a large amount of sensible heat energy in the blast furnace slag is utilized, and therefore resource waste is reduced.

Description

Technical Field

[0001] The utility model relates to the field of waste heat recovery, and particularly to a switching device for a double-flow gate valve of blast furnace slag. Background Technique

[0002] Blast furnace slag is a high-quality waste heat resource in steel plants, with high heat content and a huge annual output of blast furnace slag. At present, almost all blast furnace ironmaking in the world uses the slag granulation process by water quenching. This process scheme cannot fully recover the high-temperature heat energy in blast furnace slag, causes waste of water resources, and also causes environmental pollution. Therefore, since the late 1970s, the dry granulation technology of blast furnace slag has received extensive attention and vigorous development from steel manufacturers and relevant research institutions around the world.

[0003] Dry granulation of blast furnace slag is a method of discretizing blast furnace slag placed therein by a high-speed rotating turntable, and this method is also called the centrifugal granulation method; in this method, blast furnace slag is thrown out from the edge of the turntable under the action of centrifugal force, so as to mechanically granulate blast furnace slag. In the implementation process of the above method, due to the limitation of the recovery technology, a large amount of sensible heat energy in blast furnace slag will be dissipated in vain during the recovery process, resulting in waste of resources. Content of the Utility Model

[0004] The purpose of the utility model is to provide a switching device for a double-flow gate valve of blast furnace slag to solve the problem that a large amount of sensible heat energy in blast furnace slag is dissipated and wasted and cannot be utilized in the background technique.

[0005] In order to achieve the above purpose, the utility model adopts the following technical scheme:

[0006] A switching device for a double-flow gate valve of blast furnace slag of the utility model includes:

[0007] A blast furnace, on which there are a plurality of tapping holes;

[0008] Blast furnace slag flow channels corresponding to and connected to each tapping hole, and the blast furnace slag flow channels are connected through a communicating slag channel;

[0009] An intermediate slag ladle, which is connected to the blast furnace slag flow channel;

[0010] A plurality of gate mechanisms, which are arranged in the blast furnace slag flow channel and the communicating slag channel.

[0011] As a further improvement, the gate mechanism can connect and / or close the blast furnace slag flow channel and the communicating slag channel.

[0012] As a further improvement, the included angle between the central axis of the blast furnace slag flow channel and the horizontal line is 2° to 3°.

[0013] As a further improvement, the gate mechanism includes a gate valve and a driving member connected to the gate valve, and the driving member can drive the gate valve to move up and down.

[0014] As a further improvement, it further includes a gate hanger for fixing the driving member.

[0015] As a further improvement, it further includes a guiding device for positioning the gate valve.

[0016] As a further improvement, the gate is made of electrofused zirconia corundum material.

[0017] As a further improvement, it further includes a dry slag pit, and the dry slag pit is arranged beside the blast furnace.

[0018] As a further improvement, a skimmer is arranged in each taphole.

[0019] As a further improvement, it further includes an electric control cabinet, and the electric control cabinet is connected to the gate mechanism.

[0020] The utility model has achieved the following technical effects compared with the prior art:

[0021] This device is mainly used for the intermediate slag ladle in the pre-treatment process of blast furnace slag jet granulation fluidized bed heat exchange. Multiple blast furnace slag flow channels are provided to transport blast furnace slag to the intermediate slag ladle. The intermediate slag ladle supplies the blast furnace slag jet granulation device to granulate the blast furnace slag. When one of the blast furnace slag flow channels has a problem or needs maintenance, it can be manually or automatically switched to another blast furnace slag flow channel to supply slag to the intermediate slag ladle, ensuring that a stable and reliable molten blast furnace slag can be provided for the blast furnace slag granulation device, improving the reliability of the recovery system, ensuring that there is always one blast furnace slag flow channel working during the transportation of blast furnace slag, avoiding shutdown due to problems with the blast furnace slag flow channel, and enabling a large amount of sensible heat energy in the blast furnace molten slag to be utilized, thereby reducing resource waste.

[0022] The gate mechanism provided in this device can control the gate to automatically lift during the treatment process of blast furnace liquid slag, enabling the blast furnace liquid slag in the slag ditch to quickly and timely drain into the blast furnace slag tundish through the slag ditch, avoiding accidents. At the same time, it is not necessary for the operator to approach the gate, thus ensuring the personal safety of the operator and reducing the occurrence of accident risks. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 is a schematic diagram of the overall structure of the utility model;

[0024] Figure 2 is Figure 1 the enlarged view of I in

[0025] Figure 3 is Figure 1 the enlarged view of II in

[0026] Figure 4 It is a schematic diagram of the gate valve of the present utility model;

[0027] Figure 5 It is another schematic diagram of the gate valve of the present utility model.

[0028] Reference numerals in the drawings: 1, blast furnace; 2, tapping hole; 3, slag skimmer; 4, dry slag pit; 5, blast furnace slag flow channel; 6, gate mechanism; 7, electric control cabinet; 8, intermediate slag ladle; 9, connecting slag channel; 10, gate hanger; 11, driving member; 12, guiding device; 13, gate valve. Detailed implementation manners

[0029] The embodiments of the present application will be described in detail below. The examples of the embodiments are shown in the drawings, where the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below by referring to the drawings are exemplary and are only used to explain the present application and should not be construed as limiting the present application. On the contrary, the embodiments of the present application include all changes, modifications and equivalents falling within the spirit and scope of the appended claims.

[0030] The examples of the present application will be described in detail below. The examples of the examples are shown in the drawings, where the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The examples described below by referring to the drawings are exemplary and are intended to be used to explain the present application and should not be construed as limiting the present application.

[0031] As Figure 1 shown, a switching device for a double-flow channel gate valve of blast furnace slag of the present utility model includes: a blast furnace, on which a plurality of tapping holes are provided; blast furnace slag flow channels respectively corresponding to and connected to each tapping hole, wherein the blast furnace slag flow channels are connected through a connecting slag channel; an intermediate slag ladle, which is connected to the blast furnace slag flow channels; and a plurality of gate mechanisms, which are arranged in the blast furnace slag flow channels and the connecting slag channel.

[0032] The blast furnace in the embodiment is a 1080 m3 blast furnace, Figure 1 which has two tapping holes. The parameters of the blast furnace slag transported by the tapping holes of the blast furnace are as follows: average slag tapping duration: 30 - 40 min; normal slag flow rate: 2 - 5 t / min; peak slag flow rate: 6 t / min; specific gravity of molten blast furnace slag: liquid state 2.9 g / cm 3 ; temperature of the molten slag out of the furnace: 1400 - 1550 °C.

[0033] The parameters of the blast furnace slag in the embodiment are as follows: CaO: 35 - 40%, SiO2: 32 - 42%, Al2O3: 6 - 16%, MgO: 4 - 13%; specific gravity of the blast furnace slag: liquid state 2.2 - 2.5 g / cm3 Specific gravity of blast furnace slag: solid 2.3~2.8g / cm 3 ; Slag temperature out of the furnace: 1400~1550℃; Specific heat of blast furnace slag: Cp=1.1kJ / Kg.k; Viscosity of blast furnace slag: 0.63Pa.S; Surface tension of blast furnace slag: 0.35N / m; Liquid thermal conductivity of blast furnace slag: 0.13w / (mk); Solid thermal conductivity of blast furnace slag: 3w / (mk).

[0034] like Figure 2 and Figure 3 As shown, in the embodiment, two blast furnace slag flow channels are provided, and the two blast furnace slag flow channels are respectively connected to two iron outlets. The blast furnace slag flow channels are preferably made of andalusite-based castables, and the main components of the castables are Al2O3 50%, SiC8%, and C10%; and have the characteristics of strong resistance to chemical erosion, thermal shock resistance, and erosion resistance.

[0035] The gate mechanism can connect and / or close the blast furnace slag flow channel and connect the slag channel. In the embodiment, the gate mechanism is controlled to switch different blast furnace slag flow channels to transport blast furnace slag, such as Figure 1 As shown, in this embodiment, gate mechanisms A and D are provided on both blast furnace slag flow channels, gate mechanisms C and B are provided at both ends of the connecting slag channel respectively, and multiple gate mechanisms can be used to transport blast furnace slag in response to various situations. For example, when the blast furnace slag flow channel at the upper end needs maintenance or needs repair due to a problem, gate mechanism A is closed, gate mechanisms B, gate mechanisms C and gate mechanisms D are opened, and the blast furnace slag passes through two iron outlets. One of them passes through the blast furnace slag flow channel where the gate mechanism D is located and directly enters the intermediate slag bag, and the other has a long stroke, and will pass through the blast furnace slag flow channel where the gate mechanism A is located and then pass through the connecting slag channel to be merged into the intermediate slag bag, so as to ensure high The blast furnace slag discharged from the furnace quickly flows into the intermediate slag bag, reducing the heat loss of blast furnace slag and reducing environmental pollution; on the contrary, when the blast furnace slag flow channel at the lower end needs maintenance or repair, the D gate mechanism is closed, and the B gate mechanism, the C gate mechanism and the A gate mechanism are opened. At this time, the blast furnace slag passes through two iron outlets, one of which passes through the blast furnace slag flow channel where the A gate mechanism is located and directly enters the intermediate slag bag, and the other has a long stroke, and will pass through the blast furnace slag flow channel where the D gate mechanism is located and then pass through the connecting slag channel to merge into the intermediate slag bag; or the two blast furnace slag flow channels can work at the same time, open the A gate mechanism and the D gate mechanism, and the efficiency of transporting blast furnace slag by the two blast furnace slag flow channels at the same time will be high.

[0036] The angle between the central axis of the blast furnace slag flow channel and the horizontal line is 2° to 3°. In the embodiment, the blast furnace slag flow channel can ensure a moderate slag flow speed under the effect of the slope, reduce the scouring of the blast furnace slag on the blast furnace slag flow channel, and extend the service life. The specific preferred angle is 2°.

[0037] The gate mechanism includes a gate valve and a driving member connected to the gate valve. The driving member can drive the gate valve to move up and down. It also includes a gate hanger for fixing the driving member. It further includes a guiding device for positioning the gate valve. The gate is made of electrofused zirconia corundum material. As Figure 4 and Figure 5 shown, in the embodiment, the driving member is preferably an electric chain hoist. The shell of the electric chain hoist is made of light aluminum alloy, with high heat dissipation rate; it also uses a hoisting speed reducer made of high-quality alloy steel, which can achieve three-stage deceleration, runs very smoothly, and has a double braking system that is safe and reliable. It can be controlled and operated on-site or remotely transmit signals to achieve logical control, ensuring the safe and reliable lifting of the gate.

[0038] In the embodiment, the gate is made of electrofused zirconia corundum material. Because the two crystal phases of electrofused zirconia corundum are closely related, with a dense structure, uniform organization, low porosity, fine texture, and moderate crystal grain size, it has good corrosion resistance; among them, Al2O3>50 - 70%, ZrO2>20 - 40%, apparent porosity>9%, normal temperature compressive strength greater than 55MPa, load softening temperature greater than 1700°C, heating line change (1600°C, 3h)-0.1%, good thermal shock performance, and thermal shock resistance (1100°C water cooling) greater than 30 times, ensuring that the gate has high resistance to thermal shock of blast furnace slag and long service life.

[0039] The gate hanger in the embodiment is specifically used to install the electric chain hoist. The specifications of the electric chain hoist are protection grade IP54, working voltage 380V - 3P - 50Hz, lifting weight 125Kg, lifting height 3m. The braking configuration is double DC braking; the hanger includes a base, a straight rod is fixedly installed on the base, the straight rod is fixedly connected to the cross bar, the cross plate is equipped with an electric chain hoist, and a reinforcing rib is preferably provided between the straight rod and the cross bar.

[0040] The guiding device in the embodiment is specifically a limit post. There are two limit posts, which are arranged at both ends of the blast furnace slag flow channel, and the distance between the limit posts matches the size of the gate, and is used to limit the gate from falling into the blast furnace slag flow channel.

[0041] It also includes a dry slag pit, and the dry slag pit is arranged beside the blast furnace. The dry slag pit in the embodiment is used to receive the high-temperature liquid slag discharged from the blast furnace, and through cooling treatment, it is converted into solid dry slag, and the treated solid dry slag is transported to the intermediate slag ladle through the blast furnace slag flow channel.

[0042] A slag skimmer is provided in each tapping hole. In the embodiment, the slag skimmer is a container for separating slag and iron during the tapping process of the blast furnace. It realizes separation by using the different specific gravities of slag and iron. When the slag and iron flowing out of the tapping hole flow through the main trough to the slag skimmer, due to the greater specific gravity of the molten iron, it will sink below, while the molten slag with a smaller specific gravity floats on the top, thus achieving effective separation of slag and iron.

[0043] It also includes an electric control cabinet, which is connected to the gate mechanism. The electric control cabinet provided in the embodiment is used to remotely control the lowering or raising of the gate in the gate mechanism and select whether to connect the blast furnace slag flow channel; however, it is not limited to this. The electric chain hoist in the embodiment can also be manually controlled for lifting and lowering according to specific situations and different usage scenarios.

[0044] It should be noted that in the description of the present application, the terms "first", "second", etc. are only used for descriptive purposes and cannot be understood as indicating or implying relative importance. In addition, in the description of the present application, unless otherwise specified, the meaning of "a plurality" is two or more.

[0045] Any process or method description shown in the flowchart or described in other ways herein can be understood to represent a module, segment, or part of code including one or more executable instructions for implementing a specific logical function or process. The scope of the preferred embodiments of the present application includes additional implementations, where the functions can be executed in a substantially simultaneous manner or in the reverse order according to the involved functions, rather than in the order shown or discussed. This should be understood by those skilled in the technical field to which the embodiments of the present application belong.

[0046] In the description of this specification, the description with reference to terms such as "one embodiment", "some embodiments", "example", "specific example", or "some examples" means that the specific features, structures, materials, or characteristics described in connection 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 a suitable manner in any one or more embodiments or examples.

[0047] Although the embodiments of the present application have been shown and described above, it can be understood that the above embodiments are exemplary and should not be construed as limiting the present application. Those of ordinary skill in the art can make changes, modifications, substitutions, and variations to the above embodiments within the scope of the present application.

Claims

1. A switching device for a two-flow channel gate valve of blast furnace slag, characterized in that, Comprising: A blast furnace, on which there are a plurality of tapping holes; A blast furnace slag flow channel corresponding to and connected to each tapping hole, wherein the blast furnace slag flow channels are connected through a connecting slag channel; An intermediate slag ladle, which is connected to the blast furnace slag flow channel; A plurality of gate mechanisms, which are arranged in the blast furnace slag flow channel and the connecting slag channel.

2. The switching device of the double-flow channel gate valve for blast furnace slag according to claim 1, wherein The gate mechanism can connect and / or close the blast furnace slag flow channel and the connecting slag channel.

3. The switching device of the double-flow gate valve for blast furnace slag according to claim 1, wherein, The central axis of the blast furnace slag flow channel forms an angle of 2° to 3° with the horizontal line.

4. The switching device of the double-flow gate valve for blast furnace slag according to claim 1, characterized in that, The gate mechanism includes a gate valve and a driving member connected to the gate valve, and the driving member can drive the gate valve to move up and down.

5. The switching device of the double-flow gate valve for blast furnace slag according to claim 4, characterized in that, It further includes a gate hanger for fixing the driving member.

6. The switching device of the double-flow gate valve for blast furnace slag according to claim 4, characterized in that, It further includes a guiding device for positioning the gate valve.

7. The switching device of the double-flow channel gate valve for blast furnace slag according to claim 4, wherein The gate is made of electrofused zirconia corundum material.

8. The switching device of the double-flow gate valve for blast furnace slag according to claim 1, wherein It further includes a dry slag pit, which is arranged beside the blast furnace.

9. The switching device of the double-flow gate valve for blast furnace slag according to claim 1, wherein A slag skimmer is arranged in each tapping hole.

10. The switching device of the double-flow channel gate valve for blast furnace slag according to claim 1, characterized in that, It further includes an electric control cabinet, which is connected to the gate mechanism.

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