Calcium carbide waste heat recovery system

Abstract

The present application relates to calcium carbide production system technical field, specifically to a kind of calcium carbide waste heat recovery system, including calcium carbide furnace and track, track is equipped with train running along track, the track includes out pot point, calcium carbide pot carried by train is unloaded at out pot point;Further include: first tunnel, the part of track between the furnace mouth of calcium carbide furnace to out pot point passes through from first tunnel, the first tunnel has first air inlet;First heat exchanger and second heat exchanger, the first air inlet of the first tunnel is communicated with the gas inlet end of first heat exchanger;Crushing system, including for carrying out the crushing device of the setting of molten calcium carbide, the crushing device includes crushing mechanism, the crushing mechanism includes rack, is arranged on the crushing groove of rack, and crushing head.The present application can realize the purpose of waste heat recovery in the process of train carrying calcium carbide operation and waste heat recovery in the process of crushing.

Description

Technical Field

[0001] This invention relates to the field of calcium carbide production system technology, and specifically to a calcium carbide waste heat recovery system. Background Technology

[0002] In the existing calcium carbide production process, the main steps are as follows: calcium carbide raw materials are processed in a calcium carbide furnace to form high-temperature molten calcium carbide. Then, the molten calcium carbide is poured into a calcium carbide pot on a railcarriage. The molten calcium carbide is transported to a cooling room by the train to cool and solidify into solid calcium carbide. Then, the calcium carbide is crushed and screened in sequence.

[0003] However, in this method, calcium carbide is crushed after cooling, and calcium carbide releases a lot of heat during the cooling process. If the heat is allowed to evaporate directly, it is undoubtedly a waste of resources. Moreover, the calcium carbide also releases heat during the process of being transported by train after it is produced from the furnace. This part of the heat also has recycling value. Therefore, how to design a system that can effectively recover the waste heat of calcium carbide has become a technical problem that urgently needs to be solved by those skilled in the art. Summary of the Invention

[0004] In order to solve at least one of the technical problems mentioned in the background art, the present invention aims to provide a calcium carbide waste heat recovery system.

[0005] To achieve the above objectives, the present invention provides the following technical solution:

[0006] A calcium carbide waste heat recovery system includes a calcium carbide furnace and a track, with a train running along the track. The track includes a boiler discharge point where the calcium carbide boiler carried by the train is unloaded. The waste heat recovery system further includes:

[0007] A first tunnel, through which the portion of the track located between the furnace opening and the unloading point of the calcium carbide furnace passes, and the first tunnel has a first air inlet;

[0008] The first heat exchanger and the second heat exchanger, wherein the first air inlet of the first tunnel is connected to the air inlet of the first heat exchanger.

[0009] A crushing system includes a crushing device for crushing and shaping molten calcium carbide. The crushing device includes a crushing mechanism, which includes a frame, a crushing trough mounted on the frame, and a crushing head. The crushing head includes a die and a lifting mechanism for driving the die along the Z-axis. The bottom of the die has several independent frames. The crushing trough includes a first trough wall and a second trough wall arranged opposite each other along the Y-axis. A fan is provided on the first trough wall, and ventilation holes are provided on the second trough wall. An air intake channel communicating with the ventilation holes is provided on the outer side of the second trough wall. The air intake channel has a second air intake port. The second air intake port is connected to the air inlet of a second heat exchanger.

[0010] Compared with existing technologies, the advantages of this solution are:

[0011] Firstly, in this scheme, by setting up a first heat exchanger and a first tunnel, the section of the track between the furnace opening and the outlet of the calcium carbide furnace passes through the first tunnel, and the first air inlet of the first tunnel is connected to the air inlet of the first heat exchanger. In this way, high-temperature molten calcium carbide is loaded from the furnace opening of the calcium carbide furnace onto the calcium carbide pot on the train. The train then carries the calcium carbide pot through the first tunnel, and the heat of the calcium carbide is dissipated into the first tunnel to form hot air. The hot air in the first tunnel is then introduced into the first heat exchanger through the first air inlet to achieve heat exchange, thereby realizing the purpose of waste heat recovery during the operation of the train carrying calcium carbide.

[0012] Secondly, in this scheme, after the calcium carbide furnace is unloaded at the outlet, it can be directly transferred to the crushing device, so that the calcium carbide is crushed in the crushing tank in a molten state in conjunction with the frame of the die head. The calcium carbide is divided into multiple areas by each frame. After the molten calcium carbide cools and solidifies, multiple small pieces of calcium carbide are formed in the crushing tank. It is equivalent to each frame forming a small piece of calcium carbide, thus achieving the purpose of crushing and shaping the molten calcium carbide.

[0013] In addition, by blowing air to one side of the second tank wall by a fan, the air will absorb the heat emitted by the calcium carbide when it passes over the crushing tank, forming hot air, which will then be blown into the air intake channel through the vent, and then introduced into the second heat exchanger through the second air intake for heat exchange, thus achieving the purpose of recovering the waste heat of calcium carbide during the crushing process.

[0014] Preferably, the system also includes a screening device for screening the calcium carbide after it has been crushed by the crushing system. The screening device includes an inner cavity and an air outlet connected to the inner cavity. The calcium carbide is screened in the inner cavity, and the air outlet is connected to the air inlet of the second heat exchanger.

[0015] Preferably, the furnace opening of the calcium carbide furnace is provided with a suction hood, which is connected to the air inlet of the first heat exchanger.

[0016] Preferably, the crushing system further includes a secondary crushing device for crushing the calcium carbide crushed by the primary crushing device; the secondary crushing device includes a crushing chamber with a third air inlet connected to the air inlet of the second heat exchanger.

[0017] Preferably, the system also includes a second tunnel through which the track passes downstream of the outlet point.

[0018] Preferably, the first tunnel is a soft tunnel, including a top plate and two side sections respectively located on the lower sides of the top plate. The top plate remains in a fixed position, and at least one of the side sections is a movable side section that can be retracted or expanded relative to the top plate. In the expanded state, the side sections and the top plate enclose each other to form a tunnel passage. In the retracted state, the movable side section is retracted relative to the top plate, so that the passage is open on the side where the movable side section is located.

[0019] Preferably, the movable side includes several heat insulation plates arranged sequentially along the extension direction of the top plate channel. The heat insulation plates are slidable along the extension direction of the channel, and adjacent heat insulation plates are movably arranged relative to each other.

[0020] Preferably, the crushing device further includes a conveyor belt and a heat insulation cover. The crushing mechanism is provided on both sides of the conveyor belt, and the heat insulation cover is located above the conveyor belt. The two crushing mechanisms, the heat insulation cover and the conveyor belt together form the air intake channel.

[0021] Preferably, the second tank wall is a movable tank wall that can move along the Y-axis direction, and the crushing device further includes a pushing mechanism for pushing the second tank wall to move along the Y-axis direction.

[0022] Preferably, the second trough wall includes a crossbeam, a fixed shaft fixedly mounted on the crossbeam, and a push plate mounted on the fixed shaft. Both the crossbeam and the fixed shaft extend along the X-axis direction, and the crossbeam is slidably mounted on the crushing trough along the Y-axis direction. The upper end of the push plate is rotatably mounted on the fixed shaft, and the lower end hangs down naturally. The crossbeam is also provided with a limiting member, which is located inside the push plate to restrict the push plate from flipping towards the side closer to the first trough wall.

[0023] Other advantages and effects of the present invention will be explained in detail in the Detailed Description of the Embodiments section. Attached Figure Description

[0024] Figure 1 This is a schematic diagram of the structure of the present invention;

[0025] Figure 2 This is a cross-sectional view of the first tunnel;

[0026] Figure 3 This is a side view of the first tunnel;

[0027] Figure 4 This is a cross-sectional view of the insulation board in the first tunnel;

[0028] Figure 5 This is a cross-sectional view of the insulation board in the first tunnel;

[0029] Figure 6 This is a cross-sectional view of the crushing device;

[0030] Figure 7 This is a schematic diagram of the crushing mechanism in a crushing device;

[0031] Figure 8 This is a cross-sectional view of the pushing mechanism in the crushing device;

[0032] Figure 9 This is a schematic diagram of the bottom structure of the die head in the crushing device;

[0033] Figure 10 This is a cross-sectional view of the crushing head in the crushing device;

[0034] Figure 11 This is a schematic diagram of the structure of the second tank wall in the crushing device;

[0035] Figure 12 This is a cross-sectional view of the second tank wall in the crushing device;

[0036] Figure 13 This is a schematic diagram of the bottom structure of the slide in the crushing device;

[0037] Figure 14 This is a flowchart showing the process of changing the gate of the crushing device from the closed state to the open state.

[0038] Figure 15 This is a front view of the screening device;

[0039] Figure 16 This is a schematic diagram showing the position of the drum in the screening device;

[0040] Figure 17 This is an axial cross-sectional view of the drum in the screening device;

[0041] Figure 18 This is a radial cross-sectional view of the drum in the screening device. Detailed Implementation

[0042] The technical solutions in the embodiments of the present invention will be clearly and completely described below. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0043] Example

[0044] Please see Figure 1-18 As shown, this embodiment provides a calcium carbide waste heat recovery system, including a calcium carbide furnace 1 and a track 11. The calcium carbide furnace 1 is mainly used to heat and melt calcium carbide raw materials to form molten calcium carbide. The calcium carbide furnace 1 has one or more furnace openings; for example, this embodiment shows a calcium carbide furnace with three furnace openings. The track 11 is distributed outside the calcium carbide furnace for train operation. The train is used to carry the calcium carbide pot, which is used to hold the molten calcium carbide output from the calcium carbide furnace. In this way, the molten calcium carbide output from the furnace openings can be transferred by the train.

[0045] Track 11 includes the outlet point. It's worth noting that the outlet point here refers to a location on the track, such as... Figure 1 As shown in section a, when the train carries the calcium carbide pot to this location, the calcium carbide pot is unloaded from the train and transferred to the crushing station. For example, a crane or similar device can be used to lift the calcium carbide pot to the crushing station for crushing.

[0046] For a calcium carbide furnace with three furnace openings, the specific distribution of its tracks is as follows: Figure 1 As shown, two tracks 11 are respectively provided on the sides of the two furnace openings on both sides of the calcium carbide furnace, and a track 11 is also formed at the middle furnace opening position, with both ends connected to the aforementioned two tracks 11. In this way, the train can run to the three furnace opening positions to load calcium carbide.

[0047] like Figure 1 As shown, the waste heat recovery system provided in this embodiment also includes a first tunnel 2, a first heat exchanger 12, a second heat exchanger 13, a crushing system, and a screening device 5. The following is a detailed description of each part:

[0048] In this embodiment, both the first heat exchanger 12 and the second heat exchanger 13 can be existing oil-gas heat exchangers, which mainly include an air flow channel and an oil flow channel. Air flows in the air flow channel and exchanges heat with the oil flowing in the oil flow channel. The air flow channel includes an inlet end and an outlet end; air enters from the inlet end and exits from the outlet end. Such oil-gas heat exchangers are specifically described in the prior art and will not be elaborated upon here.

[0049] The section of track 11 between the furnace opening and the outlet of the calcium carbide furnace passes through the first tunnel 2. Thus, after the train is loaded with calcium carbide at the furnace opening, it travels through the first tunnel 2 until it reaches the outlet position. In this way, the heat emitted by the calcium carbide can be dissipated into the first tunnel 2, thereby forming hot air in the first tunnel 2.

[0050] Combination Figure 1 and Figure 2As shown, the first tunnel 2 has a first air inlet 211, which communicates with the interior of the first tunnel 2 and can be located approximately in the middle of the first tunnel 2. The first air inlet 211 of the first tunnel 2 is connected to the air inlet of the first heat exchanger 12 through the first pipeline 14. In this way, the hot air in the first tunnel 2 can be drawn into the first heat exchanger 12 through the first pipeline 14 to exchange heat with the oil flowing in the first heat exchanger 12, thereby realizing waste heat recovery. The air that has undergone heat exchange in the first heat exchanger 12 is directly discharged from the air outlet of the first heat exchanger 12.

[0051] Since the train travels through the first tunnel 2, in actual use, when the train, calcium carbide boiler, etc., malfunction and require emergency repair inside the first tunnel 2, the high temperature inside makes it difficult for personnel to directly enter the high-temperature first tunnel 2 for maintenance work. Therefore, in this embodiment, the first tunnel 2 is designed as a soft tunnel, specifically including:

[0052] like Figure 2-5 As shown, the first tunnel 2 includes a top plate 21 and two side sections respectively located on the lower sides of the top plate 21. The top plate 21 is fixedly supported on the ground by a bracket to maintain its position. A first air intake 211 is opened on the top plate 21. At least one of the side sections is a movable side section 22 that can be retracted or expanded relative to the top plate 21. In the expanded state, the side sections and the top plate 21 together form a tunnel passage 20, as shown. Figure 2 As shown in the diagram; in the retracted state, the movable side 22 is retracted relative to the top plate 21, so that the side of the passage 20 corresponding to the movable side 22 is open. Thus, when maintenance work needs to be carried out in the first tunnel 2, the movable side 22 can be retracted, and the side of the passage 20 corresponding to the movable side 22 is in an open state. At this time, the heat of the passage 20 can be quickly dissipated from the passage 20 through the open position, realizing rapid cooling of the passage 20, so that maintenance personnel can enter the first tunnel 2 for maintenance.

[0053] The specific structure of the active side 22 is as follows: Figure 2 and Figure 3 As shown, the movable side 22 includes a plurality of heat insulation plates 221 arranged sequentially along the extending direction of the channel 20, such as... Figure 4 and Figure 5 As shown, the insulation board 221 includes a shell 2211 and an insulating asbestos 2212 encapsulated within the shell 2211, as well as an insulating cloth 2213 covering the outside of the shell 2211, such as asbestos cloth. The insulating cloths 2213 of two adjacent insulation boards 221 can be connected together by sewing, so that the two adjacent insulation boards 221 can rotate relative to each other to fold or unfold, thereby realizing the folding or unfolding of the movable side 22.

[0054] The top plate 21 is provided with a guide rail 222 extending along the channel 20. The top of the insulation plate 221 is provided with a hook 223. The hook 223 is rotatably set relative to the insulation plate 221 and slidably set on the guide rail 222. The movement of the insulation plate 221 is realized by the sliding of the hook 223 on the guide rail 222.

[0055] In this embodiment, the movable side 22 can be folded and unfolded manually or electrically. Specifically, as shown below... Figure 3 As shown, a traction mechanism can be provided, which includes a first pull rope 232, a second pull rope 234, a first rope winding machine 231, and a second rope winding machine 233. The first rope winding machine 231 is used to unwind / wind the first pull rope 232; the second rope winding machine 233 is used to unwind / wind the second pull rope 234; the first rope winding machine 231 and the second rope winding machine 233 are respectively installed at the top ends of the top plate 21; one end of the first pull rope 232 is connected to the first rope winding machine 231, and the other end is connected to the insulation plate 221 near the second end of the channel 20; one end of the second pull rope 234 is connected to the second rope winding machine 233, and the other end is connected to the insulation plate 221 near the second end of the channel 20. The insulation plate 221 near the first end of the channel 20 is positioned relative to the top plate 21 in the extension direction of the channel 20; the first rope winding machine 231 is located at the first end of the channel 20, and the second rope winding machine 233 is located at the second end of the channel 20; when it is necessary to unfold the movable side 22, the first rope winding machine 231 is controlled to continuously release the first pull rope 232, while the second rope winding machine 233 continuously winds up the second pull rope 234, so that the second pull rope 234 continuously pulls the entire insulation plate 221 to move and unfold towards the second end of the channel 20 until it is fully unfolded; when it is necessary to retract the movable side 22, the first rope winding machine 231 can be controlled to continuously wind up the first pull rope 232, while the second rope winding machine 233 continuously releases the second pull rope 234.

[0056] like Figure 1 and Figure 6-14 As shown, the crushing system includes a crushing device 3 for crushing and shaping molten calcium carbide. In practical applications, the molten calcium carbide in the calcium carbide pot is unloaded as a whole at the pot outlet and transferred to the crushing device 3. Then, the molten calcium carbide in the calcium carbide pot is poured into the crushing device 3 for crushing and shaping.

[0057] The specific structure of the crushing device 3 is as follows: the crushing device 3 includes a crushing mechanism, such as... Figure 7 As shown, the crushing mechanism includes a frame 31, a crushing trough 311 mounted on the frame 31, and a crushing head. For ease of understanding, this embodiment is specifically described using the X-axis, Y-axis, and Z-axis directions of a three-axis spatial coordinate system. For details, please refer to [reference needed]. Figure 7 As shown in the coordinate system.

[0058] The crushing head includes a die head 34 and a lifting mechanism for driving the die head 34 to move along the Z-axis. The lifting mechanism realizes the downward pressing and lifting actions of the die head 34. Figure 9 and Figure 10 The bottom of the die head 34 has several independent frames 341. The frames 341 can be formed by setting several intersecting vertical ribs at the bottom of the die head 34, with the ribs intersecting to form frames 341 with a cross section that is roughly rectangular. Each frame 341 is equivalent to a mold cavity. When the molten calcium carbide solidifies in the frame 341, it forms a calcium carbide block with a size close to that of the frame 341.

[0059] Specifically, during crushing, molten calcium carbide is poured into the crushing trough 311, and then the die head 34 is driven down by the lifting mechanism to press into the crushing trough 311. At this time, the molten calcium carbide in the crushing trough 311 enters each of the frames 341. This is equivalent to using each frame 341 to divide the calcium carbide into multiple areas. After the molten calcium carbide cools and solidifies, multiple small pieces of calcium carbide are formed in the crushing trough 311. It is equivalent to each frame 341 forming a small piece of calcium carbide, thus achieving the purpose of crushing and shaping the molten calcium carbide.

[0060] In addition, in this embodiment, the crushing groove 311 is roughly rectangular in shape, with an opening at the top forming a groove; such as Figure 7 As shown, the crushing trough 311 includes a first trough wall 32 and a second trough wall 33 arranged opposite each other along the Y-axis, and a blower 321 is provided on the first trough wall 32. Multiple blowers 321 can be provided; the blowers 321 can continue to operate after the material is poured into the crushing trough 311. Figure 6 As shown, the second tank wall 33 is provided with ventilation holes 333, and the outer side of the second tank wall 33 is provided with an air duct 30 communicating with the ventilation holes 333. The air duct 30 has a second air inlet 300.

[0061] Combination Figure 1 As shown, the second air inlet 300 is connected to the air inlet of the second heat exchanger 13 via the second pipeline 15. During operation, the fan 321 blows air towards one side of the second tank wall 33. As the air passes over the crushing tank 311, it absorbs the heat emitted by the calcium carbide within the crushing tank 311, forming hot air. This hot air is then blown into the air intake channel 30 through the ventilation hole 333, and then introduced into the second heat exchanger 13 through the second air inlet 300 on the air intake channel 30. There, it exchanges heat with the oil in the second heat exchanger 13, achieving waste heat recovery. The air output from the outlet of the second heat exchanger 13 can be directly discharged; of course, if... Figure 1As shown, an outlet pipeline can also be connected to the outlet end of the second heat exchanger 13, and the air output from the second heat exchanger 13 can be led to the outside of the fan 321 through the outlet pipeline, so that the fan 321 can reintroduce it into the air duct 30. The purpose of this arrangement is that although the air output from the second heat exchanger 13 has undergone heat exchange, it still has a certain temperature, so it can be repeatedly recycled, which is beneficial to improving the heat recovery efficiency.

[0062] In this embodiment, the specific configuration of the air duct 30 in the crushing device 3 can be as follows: Figure 6 As shown, the crushing device also includes a conveyor belt 301 and an insulation cover 302. Crushing mechanisms are provided on both sides of the conveyor belt 301. The two crushing mechanisms have the same structure and are symmetrically arranged on both sides of the conveyor belt 301. The second trough wall 33 is located on the side closer to the conveyor belt 301, and the second air inlet 300 is located on the insulation cover 302. The two crushing mechanisms, the insulation cover 302 and the conveyor belt 301 together form an air duct 30.

[0063] The conveyor belt 301 extends along the X-axis direction for conveying calcium carbide along the X-axis direction, so that the crushing mechanisms on both sides can share a single conveyor belt 301 for conveying calcium carbide; while the heat insulation cover 302 is located above the conveyor belt 301 and also extends along the X-axis direction. Specifically, the two sides of the heat insulation cover 302 can be fixed to the crushing troughs 311 on both sides of the conveyor belt 301, or other positions that can keep the heat insulation cover 302 fixed, which are not specifically limited here.

[0064] In addition, in this embodiment, it is preferable to set one end of the air duct 30 at the conveying head of the conveyor belt 301 as a closed structure, such as setting a sealing plate to block this end of the air duct 30, while the other end of the air duct 30 can be set as an open one so that the conveyor belt 301 can send out the material.

[0065] In order to allow the crushed calcium carbide in the crushing trough 311 to be directly pushed into the conveyor belt 301, in this embodiment, as follows: Figure 7 and Figure 8 The second trough wall 33 is set as a movable trough wall, which can move along the Y-axis direction. The crushing device also includes a pushing mechanism for pushing the second trough wall 33 to move along the Y-axis direction. In order to ensure that the calcium carbide in the crushing trough 311 can be pushed normally onto the conveyor belt 301, the upper surface of the conveyor belt 301 is not higher than the bottom of the crushing trough 311.

[0066] The specific structure of the second trench wall 33 is as follows: [Combined with...] Figure 11The second trough wall 33 includes a crossbeam 331, a fixed shaft 332 fixedly mounted on the crossbeam 331, and a push plate 334 mounted on the fixed shaft 332. Both the crossbeam 331 and the fixed shaft 332 extend along the X-axis. The crossbeam 331 has an opening extending along the X-axis, and the fixed shaft 332 is fixedly mounted in the opening. The crossbeam 331 and the fixed shaft 332 both extend along the X-axis, and the crossbeam 331 is slidably mounted on the crushing trough 311 along the Y-axis. Specifically, both sides of the crushing trough 311 have grooves 3111 extending along the Y-axis on their opposite sides along the X-axis. The two ends of the crossbeam 331 include chain plates 336, which are movably mounted in the grooves 3111. One or more rollers 371 capable of rolling along the grooves 3111 are mounted on the chain plates 336.

[0067] The upper end of the push plate 334 is rotatably mounted on the fixed shaft 332, and the lower end of the push plate 334 hangs down naturally under the action of gravity. A stop bar 335 extending along the X-axis is fixedly installed on the lower part of the crossbeam 331, inside the push plate 334 (i.e., near the first groove wall 32). The stop bar is located inside the push plate 334 to restrict the push plate 334 from flipping towards the side near the first groove wall 32. The surface of the stop bar 335 near the push plate 334 is a vertical surface. When the push plate 334 flips towards the side near the first groove wall 32, it will be blocked by the vertical surface of the stop bar 335, thereby limiting the push plate 334.

[0068] Initially, the pusher plate 334 is positioned at the outer edge of the crushing trough 311, serving as the trough wall. Once the calcium carbide within the crushing trough 311 solidifies, the crossbeam 331 can be moved closer to the first trough wall 32. At this point, the pusher plate 334 moves along with the crossbeam 331. Due to the presence of calcium carbide blocks at the bottom of the crushing trough 311, the lower end of the pusher plate 334 flips upwards and falls onto the surface of the calcium carbide blocks, causing the lower end of the pusher plate 334 to drag along the surface of the calcium carbide blocks. Since the calcium carbide blocks are formed from the frame 341, adjacent calcium carbide blocks along the Y-axis... A gap will be formed between the blocks. When the pusher plate 334 is dragged on the surface of the calcium carbide block, the lower end of the pusher plate 334 can flip down and fall into the gap under its own weight. As long as the crossbeam 331 is pushed along the Y-axis to the side away from the first groove wall 32, the pusher plate 334 will move with the crossbeam 331 to the side away from the first groove wall 32. Due to the obstruction of the limiter, the pusher plate 334 cannot flip up to the side closer to the first groove wall 32. Therefore, the pusher plate 334 will push the calcium carbide block located on the outer part of the pusher plate 334 onto the conveyor belt 301 and be transported away by the conveyor belt 301.

[0069] As a specific material pushing method, the pusher plate 334 can push materials in multiple times, such as in 3 times. Each time, a portion of the redstone blocks is pushed. The first time, the pusher plate 334 travels 1 / 3 of the distance along the Y-axis and completes one push, pushing 1 / 3 of the redstone blocks. Then, it travels 2 / 3 of the distance along the Y-axis and completes one push, pushing another 1 / 3 of the redstone blocks. The third time, the pusher plate 334 travels to the maximum distance position and pushes the remaining 1 / 3 of the redstone blocks.

[0070] The specific structure of push plate 334 is as follows: Figure 11 As shown, the push plate 334 includes several individual plates 3341 arranged sequentially along the fixed shaft 332. Each individual plate 3341 is independent of the others. The upper end of each individual plate 3341 is rotatably mounted on the fixed shaft 332, and the lower end hangs down naturally. Each individual plate 3341 is provided with ventilation holes 333. It is worth noting that the individual plates 3341 need to have a certain weight. For example, the weight of each individual plate 3341 is about 2kg. The reason for setting it to be relatively heavy is that when the individual plate 3341 is dragged on the surface of the calcium carbide block, due to the gap between two adjacent calcium carbide blocks, the lower end of the individual plate 3341 will continuously bounce up and down during the dragging process. At this time, the individual plate 3341 can play a certain knocking and vibration effect on the calcium carbide block, thereby breaking the adhesion between the bottoms of two adjacent calcium carbide blocks to a certain extent.

[0071] In this embodiment, the specific structure of the driving mechanism is as follows: Figure 8 As shown, the driving mechanism includes a first rotating shaft 381 rotatably disposed on the outside of the second groove wall 33 and a second rotating shaft 382 rotatably disposed on the outside of the first groove wall 32. A first gear 383 is fixedly disposed at both ends of the first rotating shaft 381, and a second gear 384 is fixedly disposed at both ends of the second rotating shaft 382. A chain 385 is fitted between the first gear 383 and the second gear 384 on the same side. Both ends of the crossbeam 331 are fixed to the two chains 385 respectively. Specifically, both ends of the chains 385 are fixed to the crossbeam 331. The two ends of the chain plate 336 at the end, so that the chain 385 and the chain plate 336 together form a closed loop structure. The pushing mechanism also includes a motor (not shown in the figure) for driving the first rotating shaft 381 and / or the second rotating shaft 382 to rotate. For example, the rotating shaft motor drives the first rotating shaft 381 to rotate, so the rotation of the first rotating shaft 381 drives the first gear 383 to rotate, which in turn drives the chain 385 to rotate. The rotation of the chain 385 can pull the crossbeam 331 to move along the slide groove 3111, thus realizing the movement of the push plate 334.

[0072] To improve efficiency, in this embodiment, as follows: Figure 7The frame 31 is provided with at least two crushing slots 311. This embodiment shows the case of using two crushing slots 311. Each crushing slot 311 has the same structure, and at least two crushing slots 311 are arranged sequentially along the X-axis. The crushing head is movably arranged on the frame 31 along the X-axis. At this time, it is equivalent to one crushing head corresponding to multiple crushing slots 311. In this way, after the crushing head completes the crushing action in the previous crushing slot 311, it can move to the next crushing slot 311 to continue the crushing action, thereby improving efficiency.

[0073] Specifically, slide rails 310 extending along the X-axis are fixedly installed on both sides of the top of the frame 31. The crushing head also includes a slide block 35 slidably disposed on the slide rail 310. The die head 34 is disposed at the bottom of the slide block 35. Thus, the slide block 35 can drive the die head 34 to move synchronously when it slides on the slide rail 310.

[0074] Of course, in this embodiment, a linear module (not shown in the figure) is also provided to achieve the sliding of the slide block 35. The linear module is used to drive the slide block 35 to move along the X-axis direction. For example, a rack and pinion linear module can be used. The rack and pinion linear module is disclosed in the prior art. It mainly includes a servo motor, a rack, and a gear. The gear is fixed on the main shaft of the servo motor. When applied to this device, the servo motor can be fixedly mounted on the slide block 35, and the rack can be fixedly mounted on the slide rail 310 and extend along the X-axis direction. The rack and gear mesh with each other. In this way, the servo motor drives the gear to rotate, and under the meshing of the rack, the servo motor and the slide block 35 as a whole can move along the X-axis direction. Of course, in other optional embodiments, the linear module can also be a lead screw linear module, etc., which is not specifically limited here.

[0075] In this embodiment, the lifting mechanism has the following structure: it includes a lead screw motor 361 and at least two transmission lead screws 362 arranged along the Z-axis. This embodiment shows the case of using four transmission lead screws 362. Each transmission lead screw 362 is fitted with a lead screw nut 363, which is rotatably mounted on a slide block 35. The lower end of the transmission lead screw 362 is fixed to the die head 34. Transmission gears 364 are fixedly fitted on the outer periphery of the lead screw nut 363 and the main shaft of the lead screw motor 361. Each transmission gear 364 is linked by a transmission chain 365. Thus, when the transmission gears 364 on the lead screw motor 361 are driven to rotate, the transmission gears 365 on the lead screw nut 363 are also driven to rotate under the drive of the transmission chain 365. Consequently, the lead screw nut 363 rotates along with it. Under the rotation of the lead screw nut 363, the transmission lead screw 362 can move along the Z-axis, thereby driving the die head 34 to move along the Z-axis. In other alternative implementations, the lifting mechanism may also employ a hydraulic cylinder or the like.

[0076] The crushing mechanism also includes a gate, which is used to cover the opening of the crushing trough 311. After the crushing head is lifted after crushing, the gate can be closed on the opening to provide some insulation for the calcium carbide blocks in the crushing trough 311. This allows the pushing process to be carried out with the gate closed, reducing the heat loss from the opening of the push plate 334 during the pushing process.

[0077] In this embodiment, the slot door is preferably an electric door, specifically an existing electric folding door, whose main structure is as follows: Figure 14 As shown, the system mainly includes two opposing folding doors. Each folding door includes two hinged door panels and a motor. One of the door panels is rotatably connected to the top of the crushing trough 311, serving as a positioning door panel 391, and is driven to rotate by the motor. The other door panel serves as a movable door panel 392, which can slide freely along the Y-axis on the top of the crushing trough 311. When opening the door, the motor drives the positioning door panel 391 to flip upwards, at which point the movable door panel 392 is pulled and slid accordingly, eventually folding to the side of the positioning door panel 391, thus opening the door. When closing the door, simply reverse the motor. Of course, in other optional embodiments, the trough door can also be a door that can be manually closed; this is not specifically limited here.

[0078] After calcium carbide is crushed by the aforementioned crushing device 3, it will form small pieces, which may still be insufficient to meet the requirements. However, in this embodiment, as... Figure 1 As shown, the crushing system also includes a secondary crushing device 5, which is used to crush the calcium carbide after it has been crushed by the crushing device. That is, the calcium carbide blocks that have been crushed by the crushing device are poured back into the secondary crushing device for further crushing to form smaller calcium carbide blocks.

[0079] The secondary crushing device can be an existing jaw crusher, which has a crushing chamber where the material is crushed. Since the calcium carbide blocks still have some heat after being removed from the crushing device, in order to recover some of the waste heat during the crushing process in the secondary crushing device, in this embodiment, a third air inlet communicating with the crushing chamber is provided. The third air inlet is connected to the second pipeline 15, which connects to the air inlet of the second heat exchanger 13. In this way, the hot air generated by the calcium carbide in the crushing chamber will be drawn out from the third air inlet and then introduced into the second heat exchanger 13 through the second pipeline 15 to achieve heat exchange and realize the purpose of waste heat recovery.

[0080] Of course, in order to improve heat recovery efficiency, such as Figure 1 As shown, a branch line can also be drawn from the outlet pipeline of the second heat exchanger 13 to the crushing chamber of the secondary crushing device, so that the air output from the outlet of the second heat exchanger 13 is blown into the crushing chamber and then introduced into the second heat exchanger 13 again by the third air inlet.

[0081] The screening device 5 is used to screen the calcium carbide after it has been crushed by the crushing system. The screening device 5 includes an inner cavity and an air outlet 562 connected to the inner cavity. The calcium carbide is screened in the inner cavity. The air outlet 562 is connected to the air inlet of the second heat exchanger 13, so that the hot air in the inner cavity can be introduced into the second heat exchanger 13 through the air outlet 562 to achieve heat recovery.

[0082] As a specific screening device, such as Figure 15-18 As shown, it mainly includes a housing 51 and a roller 52. The housing 51 has an interconnected upper space 511 and a lower space 512 inside, which are vertically connected. The housing 51 is fixedly installed on the ground so that the housing 51 is positioned relative to the ground.

[0083] The drum 52 is rotatably connected to the casing 51 and passes through the upper space 511. Several screening openings are provided on the drum wall within the upper space 511, spaced circumferentially around the drum 52. Each screening opening is equipped with a screen 521 for screening calcium carbide, covering the screening opening, thus placing the screen 521 within the upper space 511. The reason for placing the screen 521 and screening openings within the upper space 511 of the casing 51 is twofold: firstly, the fine material screened by the screen 521 falls directly into the lower space 512; secondly, if the screen 521 were not placed within the upper space 511 and instead exposed, a large amount of hot air inside the drum 52 would dissipate into the external environment through the mesh of the screen 521, which would obviously be detrimental to heat recovery efficiency.

[0084] The specific rotational connection between the roller 52 and the housing 51 is as follows: On the two axially opposite side walls of the upper space 511, there are annular protruding rings 522 extending axially along the roller 52. On the outer wall of the roller 52 located in the upper space 511, corresponding to the positions of the two annular protruding rings 522, there are two annular skirts 513. The annular skirts 513 are coaxially arranged with the roller 52 and have a space between them and the outer peripheral wall of the roller 52. The annular protruding rings 522 are movably embedded in the space. This allows the annular skirts 513 to rotate along with the roller 52 on the outer periphery of the annular protruding rings 522 when the roller 52 rotates. Furthermore, with the cooperation of the two annular protruding rings 522 and the two skirts 513, the roller 52 can maintain a basic position relative to the housing 51 in the axial direction.

[0085] The lower space 512 has a first discharge port 514 at its bottom. The first discharge port 514 is mainly used for discharging the fine calcium carbide material that has passed through the screen 521, such as... Figure 15As shown, the roller 52 is inclined, and a front shell 56 and a rear shell 57 are respectively rotatably mounted at both ends of the roller 52. The front shell 56 is located at the high end of the roller 52, while the rear shell 57 is located at the low end of the roller 52. Both the front shell 56 and the rear shell 57 are connected to the roller 52, and both the front shell 56 and the rear shell 57 are fixedly installed on the ground to keep them stationary.

[0086] Both the front shell 56 and the rear shell 57 can be connected to the end of the roller 52 by means of bearings or rotary joints. Of course, they can also be connected to the end of the roller 52 by means of an annular convex ring 522 and an annular skirt 513, which is not specifically limited here.

[0087] In the screening device 5, the internal space of the drum 52 forms an inner cavity, and the end of the front shell 56 is open to form a feed inlet 561; an air outlet 562 is provided on the upper wall of the front shell 56; a second discharge outlet 571 is provided at the bottom of the rear shell 57, and an air inlet 572 is provided at the end of the rear shell 57. In this embodiment, it is preferable that the axial direction of the air inlet 572 is arranged along the axial direction of the drum 52.

[0088] This embodiment also includes a drive mechanism for driving the roller 52 to rotate. The drive mechanism includes a drive motor 581 and a driven gear 583 fixedly sleeved on the outer periphery of the roller 52. A drive gear 582 that meshes with the driven gear 583 is fixedly connected to the main shaft of the drive motor 581. The drive motor 581 is fixedly installed on the ground to maintain its position. For example, a carrier such as a cement block is set on the ground, and then the drive motor 581 is fixed on the carrier.

[0089] In use, the calcium carbide, after being crushed by the secondary crushing device 4, is fed into the front shell 56 through the feed port 561 and then enters the rotating drum 52. When the calcium carbide reaches the screen 521, the finer calcium carbide (i.e., fine material) will pass through the screen 521 and fall directly into the lower space 512 of the machine casing 51, and finally be discharged through the first discharge port 514; while the coarser calcium carbide (i.e. coarse material) cannot pass through the screen 521, so it will continue to move along the drum 52 to the rear shell 57, and finally be discharged through the second discharge port 571 on the rear shell 57; thus, screening is achieved.

[0090] During the screening process, the hot air output from the outlet 562 is input into the second heat exchanger 13 through the inlet end of the second heat exchanger 13 for heat exchange to achieve waste heat recovery, and then discharged through the outlet end of the second heat exchanger 13. In order to improve the heat recovery efficiency, the outlet end of the second heat exchanger 13 can also be connected to the inlet 572 through a pipeline to introduce the air output from the outlet end of the second heat exchanger 13 back into the drum 52 for repeated waste heat recovery operation.

[0091] To facilitate better extraction of calcium carbide from the drum 52, in this embodiment, a central shaft 53 coaxially arranged with the drum 52 is fixedly connected inside the drum 52. The central shaft 53 is a hollow tubular structure closed at both ends. Specifically, the drum 52 can be fixed to the inner wall of the drum 52 by several support rods 55, so that the drum 52 and the central shaft 53 rotate synchronously. The outer peripheral wall of the central shaft 53 is spaced apart from the inner peripheral wall of the drum 52. A first helical blade 54 is fixedly connected to the outer peripheral wall of the central shaft 53. When the drum 52 rotates, it will drive the central shaft 53 and the first helical blade 54 to rotate synchronously together. The rotating first helical blade 54 can generate a thrust on the calcium carbide in the drum 52, pushing the calcium carbide towards the rear end shell 57. In this embodiment, a screw conveyor 59 is provided in the lower space 512 of the casing 51, which conveys the material falling into the lower space 512 to the first discharge port 514.

[0092] In order to reduce heat loss through the outer wall of the roller 52, in this embodiment, an insulating shell 510 is fixedly connected to the roller 52 and covers the outer peripheral wall of the roller 52.

[0093] The front shell 56 also includes a heat-insulating cover 563 for opening / closing the feed inlet 561. The heat-insulating cover 563 is hinged to the front shell 56, allowing it to flip relative to the front shell 56 to open / close the feed inlet 561. During screening, the heat-insulating cover 563 can be closed to seal the feed inlet 561, reducing heat loss. When feeding is required, the heat-insulating cover 563 can be opened to expose the feed inlet 561 for feeding. The heat-insulating cover 563 can be opened and closed electrically, such as by a motor rotating it; or it can be opened and closed manually, without specific limitation.

[0094] like Figure 1 As shown, when calcium carbide furnace 1 discharges calcium carbide at the furnace opening, it will generate a large amount of heat. Therefore, in this embodiment, a suction hood (not shown in the figure) is provided at the furnace opening of calcium carbide furnace 1. The suction hood is connected to the air inlet of the first heat exchanger 12 through the first pipeline 14, so as to draw hot air from the furnace opening to the first heat exchanger 12 for waste heat recovery.

[0095] After the train finishes unloading at the discharge point, the empty boiler on the train still has a certain temperature. In order to reduce the heat loss of the empty boiler, the system also includes a second tunnel 16, and the section of track 11 located downstream of the discharge point passes through the second tunnel 16.

[0096] It will be apparent to those skilled in the art that the present invention is not limited to the details of the exemplary embodiments described above, and that the invention can be implemented in other specific forms without departing from the spirit or essential characteristics of the invention. Therefore, the embodiments should be considered in all respects as exemplary and non-limiting, and the scope of the invention is defined by the appended claims rather than the foregoing description. Thus, it is intended that all variations falling within the meaning and scope of equivalents of the claims be included within the present invention.

Claims

1. A calcium carbide waste heat recovery system, comprising a calcium carbide furnace and a track, wherein a train is mounted on the track and runs along the track, the track includes a discharge point, at which the calcium carbide furnace carried by the train is unloaded, and the waste heat recovery system further includes: A first tunnel, through which the portion of the track located between the furnace opening and the unloading point of the calcium carbide furnace passes, and the first tunnel has a first air inlet; The first heat exchanger and the second heat exchanger, wherein the first air inlet of the first tunnel is connected to the air inlet of the first heat exchanger. A crushing system includes a crushing device for crushing and shaping molten calcium carbide. The crushing device includes a crushing mechanism, which includes a frame, a crushing trough mounted on the frame, and a crushing head. The crushing head includes a die and a lifting mechanism for driving the die along the Z-axis. The bottom of the die has several independent frames. The crushing trough includes a first trough wall and a second trough wall arranged opposite each other along the Y-axis. A fan is provided on the first trough wall, and ventilation holes are provided on the second trough wall. An air intake channel communicating with the ventilation holes is provided on the outer side of the second trough wall. The air intake channel has a second air intake port. The second air intake port is connected to the air inlet of a second heat exchanger. The first tunnel is a soft tunnel, including a top plate and two side sections respectively located on the lower sides of the top plate. The top plate remains in a fixed position, and at least one of the side sections is a movable side section that can be retracted or unfolded relative to the top plate. In the unfolded state, the side sections and the top plate enclose each other to form a tunnel passage. In the retracted state, the movable side retracts relative to the top plate, thereby opening the channel on the side corresponding to the movable side.

2. The calcium carbide waste heat recovery system according to claim 1, characterized in that, It also includes a screening device for screening the calcium carbide after it has been crushed by the crushing system; the screening device includes an inner cavity and an air outlet connected to the inner cavity, the calcium carbide is screened in the inner cavity, and the air outlet is connected to the air inlet of the second heat exchanger.

3. The calcium carbide waste heat recovery system according to claim 2, characterized in that, The furnace opening of the calcium carbide furnace is equipped with a suction hood, which is connected to the air inlet of the first heat exchanger.

4. The calcium carbide waste heat recovery system according to claim 1, characterized in that, The crushing system further includes a secondary crushing device, which is used to crush the calcium carbide after it has been crushed by the primary crushing device; the secondary crushing device includes a crushing chamber, which has a third air inlet, and the third air inlet is connected to the air inlet of the second heat exchanger.

5. The calcium carbide waste heat recovery system according to claim 1, characterized in that, It also includes a second tunnel, through which the track is located downstream of the outlet point.

6. The calcium carbide waste heat recovery system according to claim 1, characterized in that, The movable side includes several heat insulation plates arranged sequentially along the extension direction of the top plate channel. The heat insulation plates can slide along the extension direction of the channel, and adjacent heat insulation plates are movably arranged relative to each other.

7. The calcium carbide waste heat recovery system according to claim 1, characterized in that, The crushing device also includes a conveyor belt and a heat insulation cover. The crushing mechanism is provided on both sides of the conveyor belt, and the heat insulation cover is located above the conveyor belt. The two crushing mechanisms, the heat insulation cover and the conveyor belt together form the air intake channel.

8. A calcium carbide waste heat recovery system according to claim 7, characterized in that, The second tank wall is a movable tank wall that can move along the Y-axis direction. The crushing device also includes a pushing mechanism for pushing the second tank wall to move along the Y-axis direction.

9. A calcium carbide waste heat recovery system according to claim 7, characterized in that, The second trough wall includes a crossbeam, a fixed shaft fixedly mounted on the crossbeam, and a push plate mounted on the fixed shaft. Both the crossbeam and the fixed shaft extend along the X-axis direction, and the crossbeam is slidably mounted on the crushing trough along the Y-axis direction. The upper end of the push plate is rotatably mounted on the fixed shaft, and the lower end hangs down naturally. The crossbeam is also provided with a limiting member, which is located inside the push plate to restrict the push plate from flipping towards the side closer to the first trough wall.

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