Calcium carbide waste heat recovery device and system

Abstract

The utility model relates to the technical field of calcium carbide heat recovery, in particular to a calcium carbide waste heat recovery device and system which comprises a steam generator, a first pipeline, a second pipeline, a third pipeline and the calcium carbide waste heat recovery device. A pump is arranged on the first pipeline, the first pipeline is connected to the heat-conducting medium inlet end of the heat exchanger, and the second pipeline is connected to the heat-conducting medium outlet end of the heat exchanger and used for conveying the heat-conducting medium flowing out of the heat exchanger into the steam generator so as to perform heat exchange with water in the steam generator to generate steam; the third pipeline is connected to the steam generator and used for conveying the heat-conducting medium flowing out of the steam generator to the first pipeline; according to the scheme, calcium carbide is cooled through circulating air, and compared with a natural cooling mode, the cooling efficiency is undoubtedly improved; in addition, in the cooling process, waste heat emitted by the calcium carbide can be recycled and cannot be directly discharged into the environment, and therefore the energy-saving effect can be achieved.

Description

Technical Field

[0001] The utility model relates to the technical field of calcium carbide heat recovery, and in particular to a calcium carbide waste heat recovery device and system. Background Art

[0002] The current status of the calcium carbide production process is: after the calcium carbide is melted, it flows out of the calcium carbide furnace mouth at about 2000℃ and flows into the calcium carbide pot to be loaded. The calcium carbide pot is then pulled to the cooling workshop by a rail trolley. After cooling for about three hours, the molten surface of the calcium carbide solidifies to 800℃, and the overhead crane in the cooling workshop pulls it out of the calcium carbide pot. The calcium carbide blocks are piled in the calcium carbide block stacking area. After about twenty-four hours, the calcium carbide blocks are cooled to about 150℃ by natural cooling method before they are crushed or sold as whole blocks.

[0003] Since the above-mentioned cooling process of the calcium carbide weight is a natural cooling process, it takes about 30 hours to reduce its temperature from 2000℃ to 150℃, which has a serious impact on the environment, specifically in the following aspects:

[0004] (1) Every summer, the cooling workshop operators are severely damaged by the high temperature air, and the employees and equipment are seriously injured.

[0005] (2) A large amount of heat is wasted. Taking the annual output of 50 million tons of calcium carbide in China as an example, the above-mentioned heat waste is about 40 million tons, which is about 0.9 MPa steam volume.

[0006] (3) Since cooling workshops are generally small, there is not enough cooling space. Utility Model Content

[0007] In order to solve at least one of the technical problems mentioned in the background technology, the purpose of the present invention is to provide a calcium carbide waste heat recovery device and system.

[0008] To achieve the above objectives, the present invention provides the following technical solutions:

[0009] On the one hand, the utility model provides a calcium carbide waste heat recovery device, including a tunnel kiln and a circulating air path, wherein the tunnel kiln is provided with one or more layers of first conveying lines capable of conveying calcium carbide pots horizontally; the tunnel kiln has an air inlet, an air outlet, and a feed port for allowing calcium carbide pots to enter the tunnel kiln; the feed port is provided with an openable first sealing door for closing the feed port; one end of the circulating air path is connected to the air inlet, and the other end is connected to the air outlet; a heat exchanger and a fan are sequentially provided on the circulating air path; driven by the fan, the air flow output from the air outlet exchanges heat with the heat-conducting medium flowing through the heat exchanger when flowing through the heat exchanger along the circulating air path.

[0010] As an optional embodiment of the present invention, the first conveyor line includes at least two layers; the feed port is arranged at one end of the tunnel kiln; a loading mechanism is provided on the outside of the feed port, and the loading mechanism includes a lifting platform that can be lifted vertically, and a second conveyor line arranged on the lifting platform that can transport the electric stone pot horizontally; the second conveyor line can be lifted and lowered synchronously with the lifting platform to connect with any layer of the first conveyor line.

[0011] As an optional implementation manner of the present invention, the first conveying line and / or the second conveying line is a roller line.

[0012] As an optional embodiment of the present invention, the end of the tunnel kiln opposite to the feed port is provided with a discharge port for supplying power to the stone pot from the tunnel kiln, and the discharge port is provided with an openable second sealing door for closing the feed port.

[0013] As an optional embodiment of the present invention, the first sealing door can slide vertically relative to the feed port to achieve opening / closing.

[0014] As an optional implementation manner of the present invention, the air inlet is arranged at the bottom of the tunnel kiln, and the air outlet is arranged at the top of the tunnel kiln; and the air inlet and the air outlet are arranged in a transverse staggered manner.

[0015] As an optional implementation of the present invention, a cyclone dust collector is further provided on the circulating air path. Along the airflow direction, the cyclone dust collector, the heat exchanger and the fan are arranged in sequence.

[0016] On the other hand, the utility model provides a calcium carbide waste heat recovery system, including a steam generator, a first pipeline, a second pipeline, a third pipeline, and the above-mentioned calcium carbide waste heat recovery device; a pump is provided on the first pipeline, and the first pipeline is connected to the heat transfer medium inlet end of the heat exchanger, and is used to pass the heat transfer medium into the heat exchanger under the drive of the pump; the second pipeline is connected to the heat transfer medium outlet end of the heat exchanger, and is used to transport the heat transfer medium flowing out of the heat exchanger to the steam generator for heat exchange with the water in the steam generator to generate steam; the third pipeline is connected to the steam generator for transporting the heat transfer medium flowing out of the steam generator to the first pipeline; the heat transfer medium is heat transfer oil or molten salt.

[0017] As an optional embodiment of the present invention, the first pipeline includes a main pipeline and two branch pipelines, one end of the main pipeline is connected to the heat transfer medium inlet end of the heat exchanger, and the other end is connected to one end of the two branch pipelines respectively, and the other end of the branch pipeline is connected to the third pipeline; a pump and two first valves are provided on each of the branch pipelines, wherein the pump is located between the two first valves.

[0018] As an optional embodiment of the present invention, it further includes a supplementary tank for supplementing the heat-conducting medium, the outlet end of the supplementary tank is connected to the first pipeline, and the outlet end of the supplementary tank is connected to the second valve; or, it further includes an expansion tank and a supplementary tank for supplementing the heat-conducting medium, the outlet end of the supplementary tank is connected to the first pipeline, and the outlet end of the supplementary tank is connected to the second valve; the expansion tank is connected to the third pipeline through the fourth pipeline, and is connected to the inlet end of the supplementary tank through the overflow pipeline.

[0019] Compared with the existing technology, the advantages of adopting this solution are:

[0020] In this solution, the calcium carbide pot containing the calcium carbide to be cooled can be transported to the tunnel kiln through the first conveyor line, and then the airflow (wind) is circulated between the circulating air path and the inside of the tunnel kiln under the action of the fan. During this process, the airflow blows the calcium carbide in the calcium carbide pot in the tunnel kiln to cool the calcium carbide and absorb the heat emitted by the calcium carbide. The airflow after absorbing heat flows through the heat exchanger to exchange heat with the heat-conducting medium flowing through the heat exchanger to heat the heat-conducting medium. In this way, the waste heat of the calcium carbide can be recovered by simply introducing the heat-conducting medium into the heat-using equipment (such as a steam generator).

[0021] It can be seen that this solution uses circulating air to cool calcium carbide, which undoubtedly improves the cooling efficiency compared to the natural cooling method; and during the cooling process, the waste heat emitted by calcium carbide can be recovered instead of being directly discharged into the environment, thus achieving energy-saving effects.

[0022] In addition, it is worth mentioning that in this solution, circulating air is used during the cooling process, that is, the airflow returns to the tunnel kiln after heat exchange in the heat exchanger. The significance of such design is:

[0023] On the one hand, because calcium carbide will react with water to produce acetylene, pulverization will occur; by adopting circulating air, the circulating air will carry a small amount of moisture at the beginning. This moisture will react with calcium carbide to produce acetylene. At the same time, the water content in the air will be reduced accordingly or even become water-free. In this way, in the subsequent circulation process, the circulating air is basically in a relatively dry state, thereby reducing the phenomenon of calcium carbide pulverization.

[0024] On the other hand, the circulating air still has a certain temperature after heat exchange in the heat exchanger. If it is discharged directly into the atmosphere, it is undoubtedly a waste. However, re-introducing it into the tunnel kiln for recycling can improve the waste heat recovery efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figure 1 It is a structural diagram of the utility model;

[0026] Figure 2 This is a schematic diagram of the structure of the tunnel kiln of the utility model;

[0027] Figure 3 for Figure 1 Enlarged view of part A in the middle. DETAILED DESCRIPTION

[0028] The following is an explanation and description of the technical solutions of the embodiments of the present invention in conjunction with the drawings of the embodiments of the present invention, but the following embodiments are only preferred embodiments of the present invention and are not exhaustive. Based on the embodiments in the embodiments, other embodiments obtained by those skilled in the art without creative work are all within the scope of protection of the present invention.

[0029] In the following description, terms such as "inside", "outside", "up", "down", "left", "right", etc. that indicate directions or positional relationships are only used to facilitate the description of the embodiments and simplify the description, and do not indicate or imply that the device or element referred to must have a specific direction, be constructed and operate in a specific direction. Therefore, they should not be understood as limiting the present invention.

[0030] Example 1

[0031] See also Figure 1-3 As shown, this embodiment provides a calcium carbide waste heat recovery device, which is mainly used to cool calcium carbide and recover the waste heat emitted by the calcium carbide during the cooling process; after the calcium carbide is melted, it flows out from the furnace mouth of the calcium carbide furnace at about 2000℃ and flows into the calcium carbide pot to be loaded. The calcium carbide pot is then pulled to the cooling workshop by a rail trolley to use this device to recover the waste heat, which will be explained in detail later.

[0032] like Figure 1 and Figure 2 As shown, the calcium carbide waste heat recovery device provided in this embodiment includes a tunnel kiln 1 and a circulating air duct 4, wherein the tunnel kiln 1 is provided with one or more layers capable of transporting calcium carbide pots (such as Figure 2 The first conveyor line 2 (shown in the middle M part).

[0033] like Figure 2 As shown, the tunnel kiln 1 has an air inlet 14, an air outlet 13, and a feed port 11 for the electric stone pot to enter the tunnel kiln 1; in this embodiment, as shown in FIG. Figure 2 As shown, the feed port 11 is arranged at the left end of the tunnel kiln 1 .

[0034] The feed port 11 is provided with an openable first sealing door 111 for closing the feed port 11; optionally, the first sealing door 111 is a sealing door that can slide vertically to open and close, that is, the first sealing door 111 can slide vertically relative to the feed port 11 to achieve opening / closing, wherein the first sealing door 111 can be driven by a motor, a hydraulic cylinder, or a screw module to achieve vertical sliding for opening and closing, for example, the first sealing door 111 slides upward to open the feed port 11 and slides downward to close the discharge port 12. Of course, in other optional embodiments, the first sealing door 111 can also be a sliding door that can slide laterally, which is not specifically limited here.

[0035] like Figure 1 As shown, one end of the circulating air path 4 is connected to the air inlet 14, and the other end is connected to the air outlet 13. Specifically, along the air flow direction, a cyclone dust collector 41, a heat exchanger 42, and a fan 43 are sequentially provided on the circulating air path 4, and the fan 43 is preferably a blower.

[0036] During operation, after the calcium carbide pots filled with calcium carbide are sequentially conveyed into the tunnel kiln 1 through the first conveyor line 2, the first sealing door 111 is closed, and then the fan 43 is turned on. Along the circulating air path 4, the fan 43 passes the airflow (i.e., circulating air) into the tunnel kiln 1 through the air inlet 14. The airflow in the tunnel kiln 1 flows out to the air outlet 13, and then passes through the cyclone dust collector 41 and the heat exchanger 42 in sequence before being extracted again by the fan 43. This cycle is repeated to form a circulating airflow between the tunnel kiln 1 and the circulating air path 4. ; During this process, when flowing in the tunnel kiln 1, the calcium carbide pot and the calcium carbide in the calcium carbide pot will be blown to cool the calcium carbide. During the cooling process, the circulating air will absorb the heat of the calcium carbide and be heated. The heated circulating air passes through the cyclone dust collector 41 for dust removal, and then flows through the heat exchanger 42, thereby exchanging heat with the heat-conducting medium flowing through the heat exchanger 42, so that the heat-conducting medium is heated. In this way, the heat-conducting medium only needs to be passed into the heat-using equipment (such as the steam generator 7) to recycle and utilize this part of the heat.

[0037] It can be seen that this embodiment uses circulating air to cool the calcium carbide, which undoubtedly improves the cooling efficiency compared to the natural cooling method; and during the cooling process, the waste heat emitted by the calcium carbide can be recovered instead of being directly discharged into the environment, thus achieving an energy-saving effect.

[0038] In addition, it is worth noting that in this solution, during the cooling process, a circulating air method is used, that is, the airflow returns to the tunnel kiln 1 after heat exchange in the heat exchanger 42. The significance of such a design is:

[0039] On the one hand, because calcium carbide will react with water to produce acetylene, pulverization will occur; by adopting circulating air, the circulating air will carry a small amount of moisture at the beginning. This moisture will react with calcium carbide to produce acetylene. At the same time, the water content in the air will be reduced accordingly or even become water-free. In this way, in the subsequent circulation process, the circulating air is basically in a relatively dry state, thereby reducing the phenomenon of calcium carbide pulverization.

[0040] On the other hand, after the circulating air has been heat exchanged in the heat exchanger 42, it still has a certain temperature (about 190°C). If it is directly discharged into the atmosphere, it is undoubtedly a waste. However, by reintroducing it into the tunnel kiln 1 for recycling, the waste heat recovery efficiency can be improved.

[0041] The entire cooling process lasts about 160 minutes, and the temperature of the calcium carbide drops to about 700°C. When the calcium carbide in the tunnel kiln 1 is cooled, the first sealed door 111 can be opened to open the feed port 11, and then the first conveyor line 2 is controlled to reversely convey the calcium carbide pot so that the calcium carbide pot is output from the feed port 11. Then the above steps are repeated to cool the next batch of calcium carbide. It can be seen that in this method, the feed port 11 serves as a channel for calcium carbide to enter the tunnel kiln 1 and also as a channel for calcium carbide to exit the tunnel kiln 1.

[0042] Different from the above-mentioned method of using the feed port 11 as both the feed channel and the discharge channel, this embodiment preferably provides an additional discharge port 12. Specifically:

[0043] The tunnel kiln 1 is provided with a discharge port 12 at one end opposite to the feed port 11 (i.e., the right end of the tunnel kiln 1) for supplying electricity to the stone pot from the tunnel kiln 1. The discharge port 12 is provided with an openable second sealing door 121 for closing the feed port 11. The first sealing door 111 and the second sealing door 121 can adopt the same structure, and reference can be made to the description of the first sealing door 111, which will not be elaborated on here.

[0044] During cooling, the first sealing door 111 and the second sealing door 121 are closed at the same time. When discharging after cooling, the second sealing door 121 is opened to open the discharge port 12, and the first conveyor line 2 conveys the calcium carbide pot to the right, so that the calcium carbide pot is output from the discharge port 12 to the tunnel kiln 1.

[0045] In this embodiment, the heat transfer medium can be thermal oil or molten salt. The advantages and disadvantages of both are:

[0046] The advantages of using thermal oil as a heat transfer medium are: the usage method is relatively mature; the disadvantages are: it will catch fire when exposed to high temperature calcium carbide and the price is high.

[0047] The advantages of using molten salt as a heat transfer medium are: safe to use and relatively low price; disadvantages: the product is relatively new and the method of use is not familiar.

[0048] In order to increase the travel of the circulating air in the tunnel kiln 1 and improve the cooling effect, in this embodiment, as Figure 2 As shown, the air inlet 14 is arranged at the bottom of the tunnel kiln 1, and the air outlet 13 is arranged at the top of the tunnel kiln 1; and the air inlet 14 and the air outlet 13 are arranged in a transverse staggered manner; for example, in this embodiment, the air outlet 13 is arranged at the upper left part of the tunnel kiln 1, and the air outlet 13 is arranged at the lower right part of the tunnel kiln 1.

[0049] In this embodiment, the first conveyor line 2 preferably includes at least two layers to increase the number of placed electric stone pots. For example, this embodiment shows the situation of using two layers of first conveyor lines 2. The two layers of first conveyor lines 2 are arranged in sequence along the vertical direction, and the first conveyor line 2 is arranged horizontally along the horizontal direction.

[0050] Since the two-layer first conveyor line 2 is at a certain height compared to the ground, especially the upper conveyor line is higher, in order to facilitate the delivery of the calcium carbide pot to the first conveyor line 2, in this embodiment, a loading mechanism 3 is provided on the outside of the feed port 11, and the loading mechanism 3 includes a lifting platform 31 that can be lifted vertically, and a second conveyor line 32 that can transport the calcium carbide pot horizontally on the lifting platform 31; wherein the lifting platform 31 is driven vertically to lift and lower by a driving component, and the driving component can be a common lifting actuator such as a screw linear module and a cylinder.

[0051] The second conveyor line 32 is arranged on the top of the lifting platform 31 and can be lifted and lowered synchronously with the lifting platform 31 to dock with any layer of the first conveyor line 2. The docking here can be understood as that, in the docking state, the conveying surface of the second conveyor line 32 is flush with the conveying surface of the first conveyor line 2 docked with it, or the former is slightly higher than the latter.

[0052] When in use, the calcium carbide pot filled with calcium carbide is pulled to the cooling workshop by a rail trolley, and then lifted to the second conveyor line 32 of the lifting platform 31 by the workshop's overhead crane 33. When the calcium carbide pot needs to be placed on the first conveyor line 2 on the upper layer, the lifting platform 31 is driven to rise so that the second conveyor line 32 is docked with the first conveyor line 2 on the upper layer, and then the second conveyor line 32 is controlled to convey the calcium carbide pot to the right. The calcium carbide pot is conveyed to the right by the second conveyor line 32 through the feed port 11 and then moves to the first conveyor line 2. The calcium carbide pot is then conveyed to the right by the first conveyor line 2 for a distance and then stops, waiting for the next calcium carbide pot to enter. The first conveyor line 2 is driven intermittently to convey the calcium carbide pot to the right, so that the first conveyor line 2 can be filled with calcium carbide pots.

[0053] In addition, in order to facilitate the unloading of the calcium carbide pot after the cooling is completed, in this embodiment, a unloading mechanism can also be set on the outside of the discharge port 12, wherein the unloading mechanism has a structure basically the same as the loading mechanism 3, and will not be elaborated here. During unloading, the first conveyor line 2 outputs the calcium carbide pot from the discharge port 12, and then moves it to the second conveyor line on the lifting platform of the unloading mechanism, and then controls the lifting platform to descend, and finally the overhead crane lifts the calcium carbide pot away.

[0054] In this embodiment, the first conveyor line 2 and the second conveyor line 32 are preferably roller lines, which mainly include a number of rollers 21 arranged side by side in sequence along the horizontal direction. The rollers 21 can rotate, and their rotation axes are horizontally perpendicular to the horizontal direction. All rollers 21 are driven by a power device (such as a motor) to rotate synchronously in the same direction, which can drive the calcium carbide pot on the rollers 21 to be transported along the horizontal direction.

[0055] Example 2

[0056] like Figure 1-3 As shown, this embodiment further provides a calcium carbide waste heat recovery system based on Example 1, including a steam generator 7, a first pipeline 5, a second pipeline 61, a third pipeline 62, and the calcium carbide waste heat recovery device provided in Example 1.

[0057] A pump 53 is provided on the first pipeline 5 , and the pump 53 is mainly used to extract the heat transfer medium in the system.

[0058] The first pipeline 5 is connected to the heat transfer medium inlet end a of the heat exchanger 42, and is used to pass the heat transfer medium into the heat exchanger 42 under the drive of the pump 53. The second pipeline 61 is connected to the heat transfer medium outlet end b of the heat exchanger 42, and is used to transport the heat transfer medium flowing out of the heat exchanger 42 to the steam generator 7 to exchange heat with the water in the steam generator 7 to generate steam; the third pipeline 62 is connected to the steam generator 7 to transport the heat transfer medium flowing out of the steam generator 7 to the first pipeline 5 to repeat the above cycle; the heat transfer medium is thermal oil or molten salt.

[0059] During operation, circulating air circulates between the circulating air circuit 4 and the tunnel kiln 1, as described in Example 1. Simultaneously, the heat transfer medium in the system piping (primarily the piping carrying the heat transfer medium) is pumped by pump 53 through first pipe 5 and enters heat exchanger 42. During this process, the heat transfer medium exchanges heat with the circulating air through heat exchanger 42, heating it. The heated heat transfer medium then exits heat exchanger 42 and enters steam generator 7 through second pipe 61, where it exchanges heat with water in the steam generator 7, heating the water to form steam. The steam is then discharged through steam pipe 71 of steam generator 7 to the plant's steam network. After heat exchange, the heat transfer medium exits steam generator 7, flows back through third pipe 62 to first pipe 5, and is pumped again by pump 53 for the next cycle.

[0060] In this embodiment, combined with Figure 3 As shown, the first pipeline 5 includes a main pipeline 51 and two branch pipelines 52. One end of the main pipeline 51 is connected to the heat transfer medium inlet end a of the heat exchanger 42, and the other end is connected to one end of the two branch pipelines 52 respectively. The other end of the branch pipeline 52 is connected to the third pipeline 62; the branch pipelines 52 are each provided with a pump 53 and two first valves 54, wherein the pump 53 is located between the two first valves 54.

[0061] Thus, when the pump 53 on one branch line 52 needs to be shut down for maintenance, the first valves 54 at both ends of the pump 53 can be closed; and the pump 53 and the two first valves 54 on the other branch line 52 can be opened. In this way, the pump 53 on the branch line 52 can drive the heat transfer medium to flow in the system. This ensures that the system can continue to operate normally during maintenance.

[0062] In this embodiment, in order to be able to replenish the heat transfer medium when the heat transfer medium in the system pipeline is reduced, such as Figure 1 As shown, this embodiment also includes a supplementary tank 8 for supplementing the heat-conducting medium, and the heat-conducting medium is stored in the supplementary tank 8; specifically, if thermal oil is used as the heat-conducting medium, the supplementary tank 8 is an oil supplementary tank, and if molten salt is used as the heat-conducting medium, the supplementary tank 8 is a molten salt storage tank.

[0063] The outlet end of the replenishing tank 8 is connected to the first pipeline 5. Specifically, the end of the third pipeline 62 away from the steam generator 7 is connected to the outlet end of the replenishing tank 8; and the outlet end of the replenishing tank 8 is connected to the second valve 81; in this way, when the heat transfer medium needs to be replenished, the second valve 81 can be opened, so that the pump 53 can extract the heat transfer medium in the replenishing tank 8 into the system pipeline; after the oil replenishment is completed, the second valve 81 can be closed.

[0064] Furthermore, to ensure the safety and stability of the system's heat transfer medium pipeline, this embodiment also includes an expansion tank 631. This expansion tank 631 is connected to the third pipeline 62 via a fourth pipeline 63 and to the inlet of the replenishment tank 8 via an overflow pipeline 64. Thus, if the pressure in the system's heat transfer medium pipeline becomes excessive, the heat transfer medium in the expansion tank overflows, relieving the pressure. The overflowed heat transfer medium then flows back into the replenishment tank 8 via the overflow pipeline 64, thus ensuring the safety and stability of the pipeline.

[0065] In addition, in this embodiment, Figure 1As shown, an exhaust duct 9 for discharging air into the atmosphere is also connected to the air outlet end of the fan 43, and a third valve 91 is provided on the exhaust duct 9. The circulating air path 4 is provided with a fourth valve 44 on the pipeline between the air outlet end of the fan 43 and the air inlet 14; in this way, as long as the fourth valve 44 is closed and the third valve 91 is opened, the fan 43 can discharge the air into the external environment through the exhaust duct 9.

[0066] 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 present invention can be implemented in other specific forms without departing from the spirit or essential features of the present invention. Therefore, the embodiments should be considered in all respects as illustrative and non-restrictive, and the scope of the present invention is defined by the appended claims rather than the foregoing description, and it is intended that all variations that come within the meaning and range of equivalents of the claims be embraced within the present invention.

Claims

1. A calcium carbide waste heat recovery device, characterized in that: It includes a tunnel kiln and a circulating air path, wherein the tunnel kiln is provided with one or more layers of first conveying lines capable of conveying electric stone pots in the horizontal direction; the tunnel kiln has an air inlet, an air outlet, and a feed port for allowing electric stone pots to enter the tunnel kiln; the feed port is provided with an openable first sealing door for closing the feed port; one end of the circulating air path is connected to the air inlet, and the other end is connected to the air outlet; a heat exchanger and a fan are sequentially provided on the circulating air path; driven by the fan, the air flow output from the air outlet exchanges heat with the heat-conducting medium flowing through the heat exchanger when flowing through the heat exchanger along the circulating air path.

2. The calcium carbide waste heat recovery device according to claim 1, characterized in that: The first conveyor line includes at least two layers; the feed port is arranged at one end of the tunnel kiln; a loading mechanism is provided on the outside of the feed port, and the loading mechanism includes a lifting platform that can be lifted vertically, and a second conveyor line arranged on the lifting platform that can transport the electric stone pot horizontally; the second conveyor line can be lifted and lowered synchronously with the lifting platform to connect with any layer of the first conveyor line.

3. The calcium carbide waste heat recovery device according to claim 2, characterized in that: The first conveying line and / or the second conveying line is a roller line.

4. The calcium carbide waste heat recovery device according to claim 2, characterized in that: The end of the tunnel kiln opposite to the feed port is provided with a discharge port for supplying electricity to the stone pot from the tunnel kiln, and a second sealing door that can be opened to close the feed port is provided at the discharge port.

5. The calcium carbide waste heat recovery device according to claim 1, characterized in that: The first sealing door can slide vertically relative to the feed port to achieve opening / closing.

6. The calcium carbide waste heat recovery device according to claim 1, characterized in that: The air inlet is arranged at the bottom of the tunnel kiln, and the air outlet is arranged at the top of the tunnel kiln; and the air inlet and the air outlet are arranged in a transverse staggered manner.

7. The calcium carbide waste heat recovery device according to claim 1, characterized in that: The circulating air path is also provided with a cyclone dust collector. Along the airflow direction, the cyclone dust collector, the heat exchanger and the fan are arranged in sequence.

8. A calcium carbide waste heat recovery system, characterized in that: It includes a steam generator, a first pipeline, a second pipeline, a third pipeline, and a calcium carbide waste heat recovery device as described in any one of claims 1 to 7; a pump is provided on the first pipeline, the first pipeline is connected to the heat transfer medium inlet end of the heat exchanger, and is used to pass the heat transfer medium into the heat exchanger under the drive of the pump, the second pipeline is connected to the heat transfer medium outlet end of the heat exchanger, and is used to transport the heat transfer medium flowing out of the heat exchanger to the steam generator for heat exchange with water in the steam generator to generate steam; the third pipeline is connected to the steam generator for transporting the heat transfer medium flowing out of the steam generator to the first pipeline; the heat transfer medium is heat transfer oil or molten salt.

9. The calcium carbide waste heat recovery system according to claim 8, characterized in that: The first pipeline includes a main pipeline and two branch pipelines, one end of the main pipeline is connected to the heat transfer medium inlet end of the heat exchanger, and the other end is connected to one end of the two branch pipelines respectively, and the other end of the branch pipeline is connected to the third pipeline; a pump and two first valves are provided on each of the branch pipelines, wherein the pump is located between the two first valves.

10. The calcium carbide waste heat recovery system according to claim 9, characterized in that: It also includes a supplementary tank for replenishing the heat-conducting medium, the outlet end of the supplementary tank is connected to the first pipeline, and the outlet end of the supplementary tank is connected to the second valve; or, it also includes an expansion tank and a supplementary tank for replenishing the heat-conducting medium, the outlet end of the supplementary tank is connected to the first pipeline, and the outlet end of the supplementary tank is connected to the second valve; the expansion tank is connected to the third pipeline through the fourth pipeline, and is connected to the inlet end of the supplementary tank through the overflow pipeline.

Images