A continuous granulation device for molten calcium carbide

Abstract

The present invention relates to a continuous granulation device for molten calcium carbide, comprising a calcium carbide liquid container, a scraper, a rotary granulation assembly, and a waste heat recovery assembly; the rotary granulation assembly includes a granulation disc, a cooling wall, a hydraulic rod, a support assembly, and a drive assembly; the support assembly includes a rotating shaft and a sleeve; the drive assembly is used to drive the rotating shaft to rotate; the waste heat recovery assembly includes a heat storage mechanism and a heat energy utilization mechanism. The present invention rapidly cools and forms the molten liquid in the granulation disc through the cooling wall, while realizing the rapid and continuous granulation of calcium carbide liquid, improving the recovery efficiency of the latent heat and sensible heat of calcium carbide liquid.

Description

Technical Field

[0001] The present invention relates to the cooling and forming technology of carbide liquid, and particularly to a molten carbide continuous granulation device. Background Art

[0002] At present, in the process of smelting carbide in an electric arc furnace, high-temperature carbide liquid with a temperature of 1700 - 2100 °C is generated. After the high-temperature carbide liquid flows from the electric arc furnace to a cast steel carbide pot, it is first transported to a cooling workshop by a rail car and naturally ventilated to cool to 500 - 600 °C. Then, a large hook is used to lift out carbide ingots weighing about 1 ton, and they are continuously naturally ventilated to cool to below 100 °C. Then, they are sent to a crushing workshop for coarse crushing and fine crushing to make carbide particles of suitable size for standby. In the process of granulating this carbide liquid, the cooling speed of large carbide ingots is slow, the cooling time is long, and a large area of site is required. At the same time, a large amount of carbide dust is generated during the crushing process, polluting the environment. Due to the waste of carbide dust, economic losses will be caused. Moreover, a large amount of sensible heat and latent heat carried by the carbide liquid are directly wasted during the cooling process and not effectively utilized, resulting in energy loss. Summary of the Invention

[0003] In order to solve the above technical problems, the present invention provides a technical solution that can realize continuous granulation of carbide liquid and can efficiently recover the waste heat of molten carbide:

[0004] A molten carbide continuous granulation device includes a carbide liquid container, a scraper, a rotary granulation component, and a waste heat recovery component;

[0005] The carbide liquid container is used for storing molten carbide liquid and has a carbide liquid outlet on its lower surface; the carbide liquid container is fixed and immovable;

[0006] The scraper is in an "L" shape, fixed on the lower surface of the carbide liquid container, and the horizontal part of the scraper is parallel to and in contact with the upper surface of the rotary granulation component, and is used to scrape the carbide liquid flowing out of the carbide liquid outlet into the rotary granulation component;

[0007] The rotary granulation component includes: a granulation disc, a cooling wall, a hydraulic rod, a support component, and a driving component; the granulation disc has through holes arranged in a vertical array, and there are no through holes at the center position of the granulation disc; the upper surface of the cooling wall is in contact with the lower surface of the granulation disc, and a fixed block is provided at the center. Except for the position of the fixed block, the cooling wall is equally divided into at least 2 sector-shaped cooling blocks, and independent heat exchange channels are arranged inside each sector-shaped cooling block; the hydraulic rod can drive the sector-shaped cooling blocks to fold by telescoping.

[0008] The support assembly includes a rotating shaft and a sleeve. The sleeve is sleeved on the rotating shaft and fixedly connected to the rotating shaft, and a cylindrical flow channel is vertically arranged inside. The upper end of the rotating shaft is connected to a fixed block at the center of the cooling wall. The number of hydraulic rods is the same as that of the sector cooling blocks, and a hollow part is arranged inside. The lower end of the hydraulic rod is fixedly connected to the sleeve, and the telescopic end is fixedly connected to the lower surface of the cooling wall.

[0009] The cylindrical flow channels, the hollow parts of the hydraulic rods, and the heat exchange flow channels of the sector cooling blocks at corresponding positions are interconnected to form a heat exchange branch. A heat exchange medium circulates inside the heat exchange branch, and it is independent of adjacent heat exchange branches.

[0010] The driving assembly is used to drive the rotation of the rotating shaft.

[0011] The waste heat recovery assembly includes a heat storage mechanism and a heat energy utilization mechanism. The heat storage mechanism is used to store the heat energy of the heat exchange medium, and the heat energy utilization mechanism is used to convert the heat energy stored by the heat storage mechanism into either steam heat energy or electric energy.

[0012] When the device is started, while calcium carbide liquid flows out of the calcium carbide liquid container, the driving assembly drives the overall structure formed by the granulating disk, the cooling wall, the hydraulic rods, and the support assembly to rotate. As it rotates, the scraper evenly scrapes the calcium carbide liquid into the through holes of the granulating disk. After a part of the granulating disk is filled, a heat exchange medium is introduced. After that, the rotating granulating assembly always rotates except during the discharging process, and the heat exchange medium always circulates.

[0013] When the calcium carbide liquid surface in some of the sector cooling blocks solidifies into granules, control the hydraulic rods to contract, so that the sector cooling blocks corresponding to the hydraulic rods are separated from the granulating disk. The calcium carbide granules without support at the bottom fall from the through holes of the granulating disk and slide down along the upper surface of the sector cooling blocks to the calcium carbide granule collection device.

[0014] The sector cooling blocks are folded in sequence. After the corresponding calcium carbide granules fall, the hydraulic rods reset. After resetting, calcium carbide liquid can continue to be introduced into the granulating disk at this position, realizing continuous granulation.

[0015] Through the setting of the cooling wall, the solidification of calcium carbide liquid in the through holes can be accelerated. Based on the principle of thermal expansion and contraction, the solidified calcium carbide granules automatically separate from the inner wall of the through holes and automatically fall due to gravity after the sector cooling blocks are folded.

[0016] Furthermore, the outer edge of the granulating disk extends upward to form an overflow retaining ring higher than the surface of the granulating disk, which can prevent calcium carbide liquid from overflowing the granulating disk when flowing with the scraper.

[0017] Furthermore, the through holes of the granulating disk are cylindrical holes or through holes that are smaller at the top and larger at the bottom because the through hole structure needs to meet the condition of facilitating the falling of calcium carbide granules.

[0018] Further, the upper surface area of the fixed block is smaller than the area of the part without a through hole in the center of the granulation disk.

[0019] Further, the horizontal distance between the calcium carbide liquid outlet and the center of the granulation disk is 1 / 4 - 2 / 3 of the diameter of the granulation disk.

[0020] Further, after the hydraulic rod contracts, it can at least turn the corresponding sector-shaped cooling block downward to form a 45° angle with the lower surface of the granulation disk, facilitating the falling of calcium carbide particles.

[0021] Further, the sector-shaped cooling block is provided with a radial baffle and a circumferential baffle. The radial baffle divides the heat exchange flow channel in the sector-shaped cooling block into two parts, and the inlet and outlet of the heat exchange flow channel are respectively located on both sides of the radial baffle, close to the outer edge of the sector-shaped cooling block; the circumferential baffle forms an "S"-shaped flow channel on both sides of the radial baffle; meanwhile, the cylindrical flow channel and the hollow part of the hydraulic rod both have two independent one-in-one-out flow channels corresponding to the inlet and outlet of the heat exchange flow channel.

[0022] Further, the same heat exchange medium is used in each heat exchange branch and inside the heat storage mechanism.

[0023] Further, the heat exchange medium is one of water, heat-conducting oil, and molten salt.

[0024] The beneficial effects of the present invention are as follows: while realizing the rapid and continuous granulation of molten calcium carbide liquid, the recovery efficiency of the latent heat and sensible heat of calcium carbide liquid is improved; at the same time, through the setting of the foldable cooling wall, the solidified calcium carbide particles can be automatically demolded and dropped, with a simple structure, convenient operation, and high automation degree. Description of the Drawings

[0025] Figure 1 、Main structural schematic diagram of the present invention;

[0026] Figure 2 、Structural schematic diagram of the folded state of the sector-shaped cooling block of the present invention;

[0027] Figure 3 、Schematic diagram of the internal structure of the sector-shaped cooling block of the present invention and its connection with the waste heat recovery assembly;

[0028] Figure 4 、Top view of the granulation disk of the present invention.

[0029] In the figure: 1, calcium carbide liquid container, 11, calcium carbide liquid outlet, 2, scraper, 31, granulation disk, 311, through hole, 312, overflow retaining ring, 32, cooling wall, 321, fixed block, 322, sector-shaped cooling block, 323, radial baffle, 324, circumferential baffle, 33, hydraulic rod, 341, rotating shaft, 342, sleeve, 35, drive assembly, 41, heat storage mechanism, 42, heat energy utilization mechanism. Detailed implementation mode

[0030] The following will further describe in detail the specific implementation mode of the present invention in conjunction with the drawings and embodiments. The following embodiments are used to illustrate the present invention, but are not used to limit the scope of the present invention.

[0031] Embodiment 1

[0032] As Figures 1-4 shown, a molten calcium carbide continuous granulation device includes a calcium carbide liquid container 1, a scraper 2, a rotary granulation assembly, and a waste heat recovery assembly;

[0033] The calcium carbide liquid container 1 is used to store molten calcium carbide liquid and has a calcium carbide liquid outlet 11 on its lower surface; the calcium carbide liquid container 1 is fixed and the fixed platform is omitted, and all structures that can fix the calcium carbide liquid container 1 are acceptable;

[0034] The scraper 2 is in an "L" shape, fixed on the lower surface of the calcium carbide liquid container 1, and the horizontal part of the scraper 2 is parallel to and in contact with the upper surface of the rotary granulation assembly, and is used to scrape the calcium carbide liquid flowing out of the calcium carbide liquid outlet 11 into the rotary granulation assembly;

[0035] The rotary granulation assembly includes: a granulation disk 31, a cooling wall 32, a hydraulic rod 33, a support assembly, and a driving assembly 35; the granulation disk 31 has through holes 311 with a smaller upper part and a larger lower part arranged in a vertical array, and there is no through hole 311 at the center position of the granulation disk 31; the upper surface of the cooling wall 32 is in contact with the lower surface of the granulation disk 31, and a fixing block 321 is provided at the center. In this embodiment, the cooling wall 32 is equally divided into 4 sector-shaped cooling blocks 322 except for the position of the fixing block 321. Independent heat exchange channels are provided inside each sector-shaped cooling block 322, and radial baffles 323 and circumferential baffles 324 are provided inside. The radial baffle 323 divides the heat exchange channel in the sector-shaped cooling block 322 into two parts, and the inlet and outlet of the heat exchange channel are respectively located on both sides of the radial baffle 323, near the outer edge of the sector-shaped cooling block 322; the circumferential baffle 324 forms an "S"-shaped channel on both sides of the radial baffle 323; at the same time, the cylindrical channel and the hollow part of the hydraulic rod 33 both have two independent one-in-one-out channels corresponding to the inlet and outlet of the heat exchange channel; in this embodiment, the outer edge of the granulation disk 31 extends upward to form an overflow retaining ring 312, and the height of the overflow retaining ring 312 can be designed to be 4-6 cm.

[0036] The hydraulic rod 33 can drive the sector-shaped cooling block 322 to fold by telescoping. In this embodiment, the folding angle is set to 50°, which is convenient for the calcium carbide particles near the center of the granulation disk 31 to be demolded and fall off.

[0037] In this embodiment, the horizontal distance between the calcium carbide liquid outlet 11 and the center of the granulation disk 31 is 1 / 4 of the diameter of the granulation disk 31.

[0038] The support assembly includes a rotating shaft 341 and a sleeve 342. The sleeve 342 is sleeved on the rotating shaft 341 and fixedly connected to the rotating shaft 341, and 4 groups of cylindrical flow channels are vertically arranged inside. The upper end of the rotating shaft 341 is connected to a fixed block 321 at the center of the cooling wall 32. The diameter of the fixed block 321 is designed based on not affecting the folding of the sector cooling block 322 and can be designed according to the size of the calcium carbide particles required in actual situations, etc. The number of hydraulic rods 33 is the same as that of the sector cooling blocks 322, and a hollow part is arranged inside. The lower end of the hydraulic rod 33 is fixedly connected to the sleeve 342, and the telescopic end is fixedly connected to the lower surface of the cooling wall 32.

[0039] The cylindrical flow channels, the hollow parts of the hydraulic rods 33, and the heat exchange flow channels of the sector cooling blocks 322 at corresponding positions are interconnected to form a heat exchange branch. A heat exchange medium circulates inside the heat exchange branch, and it is independent of adjacent heat exchange branches.

[0040] The number of groups of cylindrical flow channels is the same as the number of sector cooling blocks 322, and each group includes two inlets and outlets. Two independent inlets and outlets also need to be set up in the hollow parts of the hydraulic rods 33, which are respectively connected to the inlets and outlets of the sector cooling blocks 322 to realize the circulation of the heat exchange medium. The heat exchange branches are all independent, which means they can be controlled independently, so that the temperatures of the sector cooling blocks 322 can be accurately controlled independently according to the sequence of the calcium carbide liquid entering.

[0041] The driving assembly 35 is used to drive the rotation of the rotating shaft 341. In this embodiment, a motor can be used for driving.

[0042] The waste heat recovery assembly includes a heat storage mechanism 41 and a heat energy utilization mechanism 42. The heat storage mechanism 41 is used to store the heat energy of the heat exchange medium, and the heat energy utilization mechanism 42 is used to convert the heat energy stored by the heat storage mechanism 41 into one of steam heat energy or electric energy. In this embodiment, the selected heat exchange medium is molten salt, that is, the heat storage mechanism 41 can select a conventional double-tank molten salt heat storage system, and the heat energy utilization mechanism 42 can select a steam generation system.

[0043] The specific working process is as follows:

[0044] STEP1: The device is started, the discharge of the calcium carbide liquid container 1 is controlled, and at the same time, the motor drives the rotation of the granulating disc 31, etc.

[0045] STEP2: After the granulating disc 31 is first filled about 1 / 2, molten salt is started to be introduced. After that, the rotating granulating assembly always keeps rotating except during the discharging process, and the heat exchange medium always keeps circulating.

[0046] STEP3: Control the flow rate and temperature of the heat exchange branch to sequentially solidify the calcium carbide liquid above the sector cooling block 322 into a formed shape. Fold the sector cooling block 322 of the pre-formed part. After the calcium carbide particles fall off, extend and reset the hydraulic rod 33;

[0047] STEP4: Control the drive mechanism and the calcium carbide liquid container 1 to continue injecting calcium carbide liquid into the granulating disc 31 of the part where the calcium carbide particles have been demolded; thereafter, a cyclic process of sequential demolding and sequential filling is formed to achieve continuous production.

[0048] The above is only the preferred embodiment of the present invention and is not used to limit the present invention. It should be noted that for those of ordinary skill in the art of this technology, without departing from the technical principle of the present invention, several improvements and modifications can be made, and these improvements and modifications should also be regarded as the protection scope of the present invention.

Claims

1. A continuous granulation device for molten calcium carbide, characterized in that: It includes a calcium carbide liquid container, a scraper, a rotary granulation assembly, and a waste heat recovery assembly; The calcium carbide liquid container is used to store molten calcium carbide liquid and has a calcium carbide liquid outlet on its lower surface; The scraper is in an "L" shape, fixed to the lower surface of the calcium carbide liquid container, and the horizontal part of the scraper is parallel to and in contact with the upper surface of the rotary granulation assembly, and is used to scrape the calcium carbide liquid flowing out of the calcium carbide liquid outlet into the rotary granulation assembly; The rotary granulation assembly includes: a granulation disk, a cooling wall, a hydraulic rod, a support assembly, and a drive assembly; The granulation disk has through holes arranged in a vertical array, and there is no through hole at the center position of the granulation disk; the upper surface of the cooling wall is in contact with the lower surface of the granulation disk, and a fixed block is provided at the center. Except for the position of the fixed block, the cooling wall is equally divided into at least two sector-shaped cooling blocks, and independent heat exchange channels are arranged inside each sector-shaped cooling block; the hydraulic rod can drive the sector-shaped cooling blocks to fold by telescoping; The support assembly includes a rotating shaft and a sleeve. The sleeve is sleeved on the rotating shaft and fixedly connected to the rotating shaft, and a cylindrical flow channel is arranged vertically inside; the upper end of the rotating shaft is connected to the fixed block at the center of the cooling wall; the number of hydraulic rods is the same as that of the sector-shaped cooling blocks, and a hollow part is arranged inside. The lower end of the hydraulic rod is fixedly connected to the sleeve, and the telescopic end is fixedly connected to the lower surface of the cooling wall; The cylindrical flow channels, the hollow parts of the hydraulic rods, and the heat exchange channels of the sector-shaped cooling blocks at corresponding positions are interconnected to form a heat exchange branch. A heat exchange medium circulates inside the heat exchange branch, and is independent of adjacent heat exchange branches; The drive assembly is used to drive the rotating shaft to rotate; The waste heat recovery assembly includes a heat storage mechanism and a heat energy utilization mechanism. The heat storage mechanism is used to store the heat energy of the heat exchange medium, and the heat energy utilization mechanism is used to convert the heat energy stored by the heat storage mechanism into one of steam heat energy or electric energy.

2. The continuous granulation device for molten calcium carbide according to claim 1, characterized in that: The outer edge of the granulation disk extends upward to form an overflow retaining ring higher than the surface of the granulation disk.

3. The continuous granulation device for molten calcium carbide according to claim 1, characterized in that: The through holes of the granulation disk are cylindrical holes or through holes with a smaller upper part and a larger lower part.

4. The continuous granulation device for fused calcium carbide according to claim 1, wherein: The upper surface area of the fixed block is smaller than the area of the part without through holes at the center of the granulation disk.

5. The continuous granulation device for molten calcium carbide according to claim 1, wherein: The horizontal distance between the calcium carbide liquid outlet and the center of the granulation disk is 1 / 4 - 2 / 3 of the diameter of the granulation disk.

6. The continuous granulation device for molten calcium carbide according to claim 1, characterized in that: After the hydraulic rod contracts, it can at least fold the corresponding sector-shaped cooling block downward to form a 45° angle with the lower surface of the granulation disk.

7. The continuous granulation device for molten calcium carbide according to claim 1, characterized in that: The sector-shaped cooling block is internally provided with a radial baffle and a circumferential baffle. The radial baffle divides the heat exchange channel inside the sector-shaped cooling block into two parts, and the inlet and outlet of the heat exchange channel are respectively located on both sides of the radial baffle, close to the outer edge of the sector-shaped cooling block; the circumferential baffle forms an "S" - shaped flow channel on both sides of the radial baffle; at the same time, the cylindrical flow channel and the hollow part of the hydraulic rod both have two independent one - in - one - out flow channels corresponding to the inlet and outlet of the heat exchange channel.

8. The continuous granulation device for molten calcium carbide according to claim 1, wherein: The same heat exchange medium is used inside each heat exchange branch and the heat storage mechanism.

9. The continuous granulation device for molten calcium carbide according to claim 8, characterized in that: The heat exchange medium is one of water, heat - conducting oil, and molten salt.

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