Bottom ring for calcium carbide production

Abstract

The utility model belongs to the technical field of electric furnace production equipment, and mainly relates to a bottom ring for calcium carbide production, which is formed by splicing four arc-shaped plates end to end in the circumferential direction, a cooling channel is arranged in each arc-shaped plate, and a plurality of turbulent flow blocks are arranged in the cooling channels. The turbulent flow blocks are arranged in the cooling channel so as to reduce the flow area of the cooling channel, according to the Bernoulli's law, when a cooling medium flows to the position where the turbulent flow blocks are arranged, the flow speed of the cooling medium can be increased, more cooling medium can flow through the cooling channel in unit time, and the cooling efficiency is improved. The cooling medium can take away more heat in unit time, so that the temperature of the bottom ring is reduced, and the service life of the bottom ring is prolonged.

Description

Technical Field

[0001] The utility model belongs to the technical field of electric furnace production equipment, and mainly relates to a bottom ring used for calcium carbide production. Background Art

[0002] Calcium carbide is an important chemical raw material, and its main component is calcium carbide. In recent years, with the continuous development of economy and society, the demand for calcium carbide in industry has been increasing.

[0003] At present, the main method for industrial production of calcium carbide is the electric heating method. First, lime and coke that meet the production requirements of calcium carbide are mixed according to the specified ratio, and then the charge is sent to the top silo of the calcium carbide furnace through a belt and a ring feeder, and then fed into the electric furnace through a feed pipe. The charge reacts with the arc heat of the electrode and the resistance heat of the charge in the electric furnace to form calcium carbide. The calcium carbide is taken out of the furnace at a fixed time and placed in the calcium carbide pot. After cooling, it is crushed into a particle size required by a certain specification, and the finished calcium carbide is obtained.

[0004] When an electric furnace is used to smelt ore, the temperature is too high, which can easily damage the bottom ring of the electric furnace. Existing electric furnaces are all provided with cooling channels that can cool the bottom ring. For example, a patent application document with publication number CN106455183A discloses a bottom ring, which includes an annular disk body, on which a plurality of water channels surrounding a circular opening are provided, and the water channels are spiral channels that are spirally wound.

[0005] Although the bottom ring can absorb the heat of the bottom ring and thus cool the bottom ring, since the water channel used for cooling is spiral, this prolongs the time that the cooling medium stays in the water channel, resulting in a good cooling effect in the front section of the water channel. However, since the cooling medium has absorbed the heat of the bottom ring in the front section, when the cooling medium reaches the rear section, the ability of the cooling medium to exchange heat is reduced, resulting in an unsatisfactory cooling effect for the bottom ring. Utility Model Content

[0006] The utility model provides a bottom ring for calcium carbide production, so as to solve the problem that the cooling effect of the bottom ring of an electric furnace in the prior art is not ideal.

[0007] In order to solve the above problems, the utility model adopts the following technical solutions:

[0008] A bottom ring for calcium carbide production is composed of four arc-shaped plates spliced ​​end to end in the circumferential direction, each of the arc-shaped plates has a cooling channel, and a plurality of spoiler blocks are arranged in the cooling channel.

[0009] The invention has the following beneficial effects: by setting a spoiler block in the cooling channel to reduce the flow area of ​​the cooling channel, it can be known from Bernoulli's principle that when the cooling medium flows to the position where the spoiler block is set, the flow rate of the cooling medium will increase, and more cooling medium will flow through the cooling channel per unit time, so that the cooling medium can take away more heat per unit time, thereby reducing the temperature of the bottom ring itself and extending the life of the bottom ring.

[0010] Furthermore, the cooling channel has a bottom surface and a top surface, and each spoiler block connects the bottom surface and the top surface.

[0011] The invention has the following beneficial effects: the spoiler block also has a supporting function in the cooling channel to prevent the cooling channel from deforming.

[0012] Furthermore, the spoiler block is a diamond block or a cylindrical block.

[0013] Furthermore, the spoiler block and the arc-shaped plate are an integrally cast structure.

[0014] The invention has the following beneficial effects: the overall strength of the bottom ring can be increased by the one-piece casting method.

[0015] Furthermore, in the radial direction of the arc-shaped plate, the lengths of the spoiler blocks from the two side walls of the cooling channel are different.

[0016] Furthermore, a reinforcing plate rib extending in the radial direction is provided in the middle of each of the arc-shaped plates.

[0017] The invention has the following beneficial effects: the strength of the arc-shaped plate is increased by arranging the reinforcing plate ribs.

[0018] Furthermore, each of the arc-shaped plates is provided with a water outlet pipe and a water inlet pipe connected to the cooling channel.

[0019] Furthermore, both ends of each of the arc-shaped plates are provided with connecting plates, and the connecting plates on adjacent ends of any two adjacent arc-shaped plates are fixedly connected.

[0020] The invention has the following beneficial effects: by fixing the adjacent connecting plates on two adjacent arc-shaped plates, the four arc-shaped plates form a circular bottom ring, and the connecting plates themselves also increase the strength of the arc-shaped plates themselves and reduce the probability of deformation.

[0021] Furthermore, the cooling channel passes through both end surfaces of the arc-shaped plate, so that the cooling channel can communicate with the cooling channel of the adjacent arc-shaped plate. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] By reading the detailed description below with reference to the accompanying drawings, the above and other purposes, features and advantages of the exemplary embodiments of the present invention will become easy to understand. In the accompanying drawings, several embodiments of the present invention are shown in an exemplary and non-limiting manner, and the same or corresponding reference numerals represent the same or corresponding parts, wherein:

[0023] Figure 1 This is a schematic diagram of the structure of the bottom ring in Example 1 of the utility model;

[0024] Figure 2 is a schematic structural diagram of the curved plate in Example 1;

[0025] Figure 3 is a front view of the curved plate in Example 1;

[0026] Figure 4 for Figure 3 Sectional view along AA direction;

[0027] Figure 5 Schematic diagram of the structure of the curved plate in Example 2.

[0028] Description of reference numerals:

[0029] 1. Arc plate; 2. Cooling channel; 3. Water outlet pipe; 4. Water inlet pipe; 5. Connecting plate; 6. Reinforced plate ribs; 7. Avoidance; 8. Spoiler. DETAILED DESCRIPTION

[0030] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Those skilled in the art should know that the embodiments described below are part of the embodiments of the present disclosure, rather than all of the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by those skilled in the art without creative work are within the scope of protection of the utility model.

[0031] Various non-limiting embodiments of the present invention are described in detail below. Any number of elements in the accompanying drawings is for illustration and not for limitation, and any naming is only for distinction and does not have any limiting meaning. It should be noted that the embodiments and features in the embodiments of the present application can be combined with each other without conflict.

[0032] Example 1

[0033] like Figure 1 As shown, a bottom ring used for calcium carbide production is composed of four arc plates 1 spliced ​​end to end in the circumferential direction. The four arc plates 1 can just form a circle. Each arc plate 1 is formed by casting. The arc plate 1 in this embodiment is a copper plate, which is easy to conduct heat.

[0034] Specifically, Figure 2-Figure 4 As shown, each arc plate 1 has a cooling channel 2, and the cooling channel 2 runs through the two end faces of the arc plate 1. In this way, when the four arc plates 1 are spliced ​​circumferentially, the cooling channels 2 in the adjacent arc plates 1 are just connected, so that the four cooling channels 2 just form a closed channel for flowing cooling medium. The sealing here uses high-temperature sealing mud to ensure that the bottom ring will not leak from here. A high-temperature resistant sealing glue disclosed in the Chinese patent document with the authorization announcement number CN103693972B can be used, or a high-temperature resistant sealing ring (silicone rubber or fluororubber) can be used for sealing, or both methods can be used at the same time, because the bottom ring is not directly in contact with the heating component, and is also cooled by the cooling medium, so the silicone rubber or fluororubber can withstand the bottom ring temperature for a long time. The cooling medium in this embodiment is water.

[0035] The cooling channel 2 extends along the arc surface of the arc plate 1, so the cooling channel 2 is also similarly arc-shaped. Each cooling channel 2 has a bottom surface, a top surface and two side surfaces. A plurality of spoiler blocks 8 are arranged in the cooling channel 2, each spoiler block 8 connects the bottom surface and the top surface, and each spoiler block 8 and the arc plate 1 are an integrally cast structure, so that the overall strength of the bottom ring can be increased by an integral casting method.

[0036] By setting a spoiler 8 in the cooling channel 2 to reduce the flow area of ​​the cooling channel 2, it can be seen from Bernoulli's principle that when the cooling medium flows to the position where the spoiler 8 is set, the flow rate of the cooling medium will increase, and more cooling medium will flow through the cooling channel 2 per unit time, so that the cooling medium can take away more heat per unit time, thereby reducing the temperature of the bottom ring itself and extending the life of the bottom ring; at the same time, the spoiler 8 also has a supporting function in the cooling channel 2 to prevent the cooling channel 2 from deforming.

[0037] Specifically, the spoiler block 8 in this embodiment is a diamond block, and according to actual conditions, the spoiler block 8 can also be set as a cylindrical block. At the same time, in the radial direction of the arc plate 1, the lengths of the spoiler block 8 from the two side walls of the cooling channel 2 are different, that is, the distance between the spoiler block 8 and one side wall of the cooling channel 2 is different from the distance between the spoiler block 8 and the other side wall of the cooling channel 2.

[0038] Specifically, each curved plate 1 is equipped with a water outlet pipe 3 and a water inlet pipe 4 connected to the cooling channel 2 for the cooling medium to enter and exit. The inner diameter of the water outlet pipe 3 and the water inlet pipe 4 is φ28mm, which increases the water flow rate passing through the bottom ring per hour, effectively reduces the temperature of the bottom ring, and thus better protects the bottom ring from deformation and damage caused by long-term high temperature. The water outlet pipe 3 and the water inlet pipe 4 are 304 stainless steel water pipes, which increases the material hardness of the connection between the water outlet pipe 3 and the water inlet pipe 4 and reduces the maintenance workload caused by thread stripping.

[0039] Both ends of each arc-shaped plate 1 are provided with connecting plates 5, and the connecting plates 5 on the adjacent ends of any two adjacent arc-shaped plates 1 are fixedly connected by bolts. By fixing the adjacent connecting plates 5 on the two adjacent arc-shaped plates 1, the four arc-shaped plates 1 form a circular bottom ring, and the connecting plates 5 themselves also increase the strength of the arc-shaped plates 1 themselves and reduce the probability of deformation.

[0040] The middle part of each arc-shaped plate 1 is provided with a reinforcing plate rib 6 extending in the radial direction thereof. In this embodiment, two reinforcing plate ribs 6 are provided, and the interval between the two reinforcing plate ribs 6 is 15 mm. The strength of the arc-shaped plate 1 is increased by providing the reinforcing plate ribs 6. At the same time, the inner arc side of each arc-shaped plate 1 is provided with a plurality of avoidance openings 7, and the avoidance openings 7 are used for the electrode conductive ribs to pass through, and are reserved positions.

[0041] In the industry, eight curved plates 1 are often used to form a bottom ring. However, due to the design of the bottom ring, all the curved plates 1 often need to be removed during the later maintenance process, which increases the workload and is not convenient for maintenance personnel to disassemble and install. In the process of splicing eight curved plates 1 into four curved plates 1, eight pouring ports are required to form two curved plates 1 products during the casting of the original two curved plates 1 products. Now, in the process of casting one curved plate 1 product, only six pouring ports are needed to complete the casting of one curved plate 1. This reduces the risk of cracking of the pouring port of the bottom ring due to high temperature during operation.

[0042] At the same time, a bottom ring, which was originally formed by eight arc plates 1, is now formed by four arc plates 1. The connection between adjacent arc plates 1 is fixed by bolts. After reducing the number of arc plates 1, the number of bolt connections is also reduced, that is, the number of bolt connections at four places is reduced, and it becomes an integral casting, which reduces the workload and maintenance time of maintenance personnel and increases the strength of the bottom ring. After the applicant's transformation and use, the average number of power outages of four electric furnaces per year is reduced to about 113 times due to bottom ring maintenance. Each shutdown for maintenance affects the output by about 60 tons. According to 4,000 yuan / ton of calcium carbide, the total savings are 113*60*4000=27,120,000 yuan.

[0043] Example 2

[0044] The difference between this embodiment and embodiment 1 is that Figure 5 As shown, in this embodiment, the cooling channel 2 in each curved plate 1 is itself a closed channel and does not penetrate the two end surfaces of the curved plate 1. When the four curved plates 1 are circumferentially spliced, the cooling channels 2 in the four curved plates 1 will not be connected, so the cooling medium flows separately in the cooling channel 2 in each curved plate 1.

[0045] Example 3

[0046] The difference between this embodiment and the first embodiment is that, in this embodiment, in the radial direction of the arc-shaped plate 1 , the distances between the spoiler 8 and the two side walls of the cooling channel 2 are the same.

Claims

1. A bottom ring for calcium carbide production, characterized in that: It is composed of four arc-shaped plates (1) spliced ​​end to end in the circumferential direction, each of the arc-shaped plates (1) has a cooling channel (2), and a plurality of spoiler blocks (8) are arranged in the cooling channel (2).

2. A bottom ring for calcium carbide production according to claim 1, characterized in that: The cooling channel (2) has a bottom surface and a top surface, and each spoiler block (8) connects the bottom surface and the top surface.

3. A bottom ring for calcium carbide production according to claim 2, characterized in that: The spoiler block (8) is a diamond-shaped block or a cylindrical block.

4. A bottom ring for calcium carbide production according to claim 3, characterized in that: The spoiler block (8) and the arc-shaped plate (1) are an integrally cast structure.

5. A bottom ring for calcium carbide production according to claim 4, characterized in that: In the radial direction of the arc-shaped plate (1), the distances between the spoiler (8) and the two side walls of the cooling channel (2) are different.

6. A bottom ring for calcium carbide production according to any one of claims 1 to 5, characterized in that: A reinforcing plate rib (6) extending in the radial direction is provided in the middle of each arc-shaped plate (1).

7. A bottom ring for calcium carbide production according to any one of claims 1 to 5, characterized in that: A water outlet pipe (3) and a water inlet pipe (4) connected to the cooling channel (2) are installed on each of the arc-shaped plates (1).

8. A bottom ring for calcium carbide production according to any one of claims 1 to 5, characterized in that: Both ends of each arc-shaped plate (1) are provided with connecting plates (5), and the connecting plates (5) on adjacent ends of any two adjacent arc-shaped plates (1) are fixedly connected.

9. A bottom ring for calcium carbide production according to any one of claims 1 to 5, characterized in that: The cooling channel (2) passes through both end surfaces of the arc-shaped plate (1), so that the cooling channel (2) can communicate with the cooling channel (2) of an adjacent arc-shaped plate (1).

10. A bottom ring for calcium carbide production according to any one of claims 1 to 5, characterized in that: The inner arc side of each arc-shaped plate (1) is provided with a plurality of avoidance openings (7).

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