Calcium carbide sensible heat air medium heat extraction system convenient for waste heat recovery

Abstract

The invention relates to a calcium carbide sensible heat utilization technology, in particular to a calcium carbide sensible heat air medium heat extraction system convenient for waste heat recovery. A calcium carbide hot air medium heat extraction system facilitating waste heat recovery comprises a tunnel, an air curtain generation device, an air outlet fan, a calcium carbide pot, a calcium carbide vehicle and an air inlet fan are arranged at an inlet and an outlet, a through pipeline with an upper opening and a lower opening is arranged in the center of the bottom of a pot body of the calcium carbide pot, and the through pipeline is located above a ventilation area of a chassis of the calcium carbide vehicle; a pot cover wind shield extending to the top wall of the tunnel is arranged on the side, facing the air inlet fan, of the pot cover, and a pot cover grating area is arranged at the position, corresponding to the pot body through pipeline, of the middle of the pot cover. According to the system, the shape of the calcium carbide pot is improved, so that calcium carbide in the pot body can be quickly cooled, heat can be quickly and massively gathered and conveniently recycled, and the calcium carbide can be effectively prevented from being in contact with air; meanwhile, airflow in the tunnel mainly penetrates through the middle of each calcium carbide pot in an S shape, and the calcium carbide cooling efficiency is improved.

Description

Technical Field

[0001] The invention relates to calcium carbide sensible heat utilization technology, and in particular to a calcium carbide sensible heat wind medium heat extraction system which is convenient for waste heat recovery. Background Art

[0002] The main component of calcium carbide is calcium carbide, which usually appears as gray or brown blocks or granules. It is an important chemical raw material, mainly used to produce acetylene gas. Calcium carbide is made through high-temperature reduction reaction. The main raw materials are limestone and coke. It is made at high temperature through the huge heat released by the electrode arc. In each cycle, the high-temperature molten calcium carbide in the calcium carbide furnace flows into the calcium carbide chute through the furnace eye of the calcium carbide furnace, and then flows into the calcium carbide pot on the calcium carbide car. The calcium carbide car filled with molten calcium carbide is sent to the cooling room under the action of the traction device. After a long period of cooling, the calcium carbide lumps coming out of the calcium carbide pot are sent to the jaw crusher for crushing and use in the next step.

[0003] Molten calcium carbide contains a large amount of heat. The heat released by calcium carbide during the cooling process after it leaves the calcium carbide furnace accounts for about 20% of the total electricity expenditure. However, due to the characteristics of calcium carbide, its sensible heat during the cooling process has not been effectively utilized. On the one hand, calcium carbide reacts with water to produce flammable gas acetylene, which causes a violent explosion; on the other hand, calcium carbide is also prone to react with oxygen and nitrogen in the air at high temperatures to produce calcium carbonate and calcium cyanamide, which affects the quality of calcium carbide products. Therefore, in the cooling process of molten calcium carbide, it is generally forbidden to use water, and wind cooling cannot be used during the high temperature stage.

[0004] In the prior art, the technologies for utilizing calcium carbide waste heat mainly include the following: (1) Wind quenching granulation and scattered point dropping technology: When calcium carbide is in a molten state, high-pressure wind is used to blow away the molten calcium carbide. The biggest disadvantage of this type of technology is that it cannot prevent the oxygen and nitrogen in the air from reacting with calcium carbide at high temperatures to generate calcium carbonate and calcium cyanamide, which affects the quality of calcium carbide products. (2) Wind direct blowing calcium carbide pot technology: In this technology, in order to prevent high-temperature calcium carbide from hardening with air, the calcium carbide pot is generally cooled to a certain temperature before air cooling begins, but the heat dissipation of calcium carbide is mainly concentrated in the high-temperature stage. After the molten calcium carbide is cooled into a calcium carbide lump, it is very difficult to transfer heat from the center to the outside due to the low thermal conductivity of calcium carbide (20w / (m.℃)). Literature shows that when the outer wall temperature of the calcium carbide pot reaches about 550℃, it is no longer meaningful to use air to obtain heat, and the center temperature of the calcium carbide lump is much higher than the 550℃ of the outer wall. The only way to achieve cooling of the center of the calcium carbide lump is to extend the time. This makes it impossible to store heat in large quantities and quickly, so the economic value of this technology is low. (3) Heat pipe heat exchange and heat extraction technology: This method is to insert a heat pipe into the calcium carbide pot and use the heat pipe to transfer heat to water for power generation. Since water is used on site, once the equipment is broken, a safety accident will occur. (4) Cutting the molten calcium carbide into pieces at high temperature solves the problem of slow heat dissipation from the center of the calcium carbide lump to the outside, but it still cannot solve the fundamental problem, and a large number of calcium carbide pots need to be added to pack small pieces of calcium carbide, which has low economic value. Summary of the invention

[0005] The purpose of the present invention is to overcome the deficiencies in the prior art and to provide a calcium carbide sensible heat air medium heat extraction system which is convenient for waste heat recovery. In this system, the shape of the calcium carbide pot is improved so that the calcium carbide in the pot can dissipate heat quickly, which is convenient for rapid and large-scale accumulation of heat and recycling; it can also effectively prevent the calcium carbide from contacting the air and ensure the quality of the calcium carbide; at the same time, the airflow in the tunnel is mainly S-shaped and passes through the middle of each calcium carbide pot, thereby improving the cooling efficiency of the calcium carbide.

[0006] In order to solve the problems of the prior art, the present invention discloses a calcium carbide sensible heat air medium heat extraction system which is convenient for waste heat recovery, comprising a tunnel, in which a plurality of calcium carbide carts are arranged in sequence, the calcium carbide carts are provided with calcium carbide pots, the calcium carbide carts travel along a travel track at the bottom of the tunnel, the tunnel comprises an entrance and an exit, rolling doors are provided at the entrance and exit positions, wind curtain generating devices are provided on the inner sides of the rolling doors at the entrance and exit positions, the direction of the high-speed airflow generated by the wind curtain generating device is perpendicular to the travel direction of the calcium carbide cart; an air outlet fan and an air inlet fan are respectively provided at the entrance and exit positions of the tunnel.

[0007] The calcium carbide car includes a chassis, which includes a chassis ventilation area arranged in the middle and a chassis grille area arranged on the side facing the air inlet fan. The chassis ventilation area is a hollow hole, and the chassis grille area is a grille structure with a plurality of ventilation holes. A chassis wind shield facing the bottom of the tunnel is arranged on the chassis of the calcium carbide car on the side away from the air inlet fan, and the chassis wind shield extends to the bottom wall of the tunnel.

[0008] The calcium carbide pot includes a pot body and a pot cover. A through pipe with upper and lower openings is arranged in the center of the bottom of the pot body. The through pipe is located above the ventilation area of ​​the calcium carbide vehicle chassis. A pot cover wind shield facing the top of the tunnel is arranged on the side of the pot cover facing the air inlet fan. The pot cover wind shield extends upward to the top wall of the tunnel. A pot cover grille area is arranged in the middle of the pot cover at a position corresponding to the through pipe of the pot body. The pot cover grille area is a grille structure with a plurality of ventilation holes.

[0009] Preferably, the air inlet fan is arranged at the bottom of the tunnel exit position, and the air outlet fan is arranged at the upper part of the tunnel entrance position.

[0010] Preferably, the height of the central through pipe is consistent with the height of the side of the pot body.

[0011] Preferably, the radius of the through pipe gradually decreases from the direction of the calcium carbide carbide vehicle chassis to the direction of the calcium carbide pot cover.

[0012] Preferably, the bottom shape of the through pipe of the pot body is consistent with the shape of the chassis ventilation area of ​​the calcium carbide vehicle, and the shape of the pot cover grille area is consistent with the top shape of the through pipe.

[0013] Preferably, an inlet groove and an overflow groove are provided on the pot body of the calcium carbide pot.

[0014] Preferably, a hook is provided in the center of the grille area of ​​the calcium carbide pot cover.

[0015] Preferably, a brush is provided on one side of the chassis windshield plate close to the bottom wall of the tunnel, and a brush is provided on one side of the pot cover windshield plate close to the top wall of the tunnel.

[0016] Preferably, the air inlet fan is connected to the tunnel through a pipeline below the chassis ventilation area of ​​the first calcium carbide car along one side of the air inlet fan.

[0017] Preferably, the top of the calcium carbide pot of the second calcium carbide car along one side of the air outlet fan in the tunnel is connected to the air outlet fan through a pipeline.

[0018] In the present invention, the airflow enters from the air inlet fan. Since the pipeline of the air inlet fan is located below the chassis ventilation area of ​​the calcium carbide ... Thus, the cycle repeats itself, with the airflow entering from the central pipe of the previous calcium carbide car into the chassis grille area, chassis ventilation area and central pipe of this calcium carbide car, and then into the chassis grille area, chassis ventilation area and central pipe of the next calcium carbide car, forming an S-shaped air path that crisscrosses up and down, effectively increasing the contact path between the airflow and the calcium carbide pot, and increasing the heat carried by the airflow. Finally, the gas carrying a large amount of heat is collected and utilized through the pipe at the exhaust fan position, thereby achieving the purpose of waste heat recovery.

[0019] The beneficial effects of the invention are as follows: 1. The structure of the calcium carbide pot is modified, and there is a central through pipe with upper and lower openings in the center of the bottom of the calcium carbide pot, so that the calcium carbide pot forms a structure with a hollow middle part and an annular outer part, and the calcium carbide lump after cooling is also a hollow annular structure in the middle, which is convenient for the rapid heat dissipation of the calcium carbide lump and solves the problem of slow heat dissipation in the center of the calcium carbide lump. 2. An S-shaped airflow passage is designed in the whole system, which can effectively extend the contact path between the airflow and the calcium carbide pot, take away more heat, and facilitate subsequent recycling. 3. The setting of rolling doors and wind curtains greatly reduces the influx of external air. The setting of the calcium carbide pot cover isolates the possibility of air in the tunnel from entering the calcium carbide pot and contacting the molten calcium carbide, thereby ensuring the quality of the calcium carbide. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 It is a schematic diagram of the structure of the present invention; Figure 2 It is a structural diagram of the electric stone pot body of the present invention; Figure 3 It is the internal structure diagram of the electric stone pot body of the present invention; Figure 4 It is a structural diagram of a pot cover in the present invention; Figure 5 It is a structural diagram of the chassis of the calcium carbide vehicle in the present invention; Figure 6 The present invention is a brush structure diagram of a chassis windshield and a pot cover windshield.

[0021] Reference numerals: 1. Tunnel; 2. Calcium carbide car; 3. Calcium carbide pot; 4. Entrance; 5. Exit; 6. Rolling door; 7. Wind curtain generating device; 8. Exhaust fan; 9. Inlet fan; 10. Chassis; 11. Chassis ventilation area; 12. Chassis grille area; 13. Chassis wind shield; 14. Pot body; 15. Pot cover; 16. Central pipe; 17. Pot cover wind shield; 18. Pot cover grille area; 19. Inlet trough; 20. Overflow trough; 21. Brush; 22. Recovery pipe; 23. Hook; 24. Slot. DETAILED DESCRIPTION

[0022] The following is further described in conjunction with the accompanying drawings. The following embodiments are only used to more clearly illustrate the technical solution of the present invention, and cannot be used to limit the protection scope of the present invention.

[0023] Embodiment 1: Figure 1 As shown, a calcium carbide sensible heat air medium heat extraction system for facilitating waste heat recovery comprises a tunnel 1, wherein a plurality of calcium carbide carts 2 are arranged in sequence in the tunnel 1, wherein the calcium carbide carts 2 are provided with calcium carbide pots 3, and the calcium carbide carts 2 travel along a travel track at the bottom of the tunnel 1, wherein the tunnel 1 comprises an entrance 4 and an exit 5, wherein rolling doors 6 are provided at the entrance 4 and the exit 5, and wind curtain generating devices 7 are provided inside the rolling doors 6 at the entrance 4 and the exit 5, wherein the direction of the high-speed airflow generated by the wind curtain generating device 7 is perpendicular to the travel direction of the calcium carbide carts 2; and an air outlet fan 8 and an air inlet fan 9 are provided at the entrance 4 and the exit 5 of the tunnel 1, respectively.

[0024] exist Figure 1 In the embodiment, the entrance end of the calcium carbide car 2 is the entrance 4 of the tunnel 1, and the exit end of the calcium carbide car 2 is the exit 5 of the tunnel 1. An air inlet fan 9 is arranged at the exit 5 of the tunnel 1, and an air outlet fan 8 is arranged at the entrance 4 of the tunnel 1. The airflow direction is opposite to the direction of travel of the calcium carbide car 2, ensuring that the airflow can always collect the heat of each calcium carbide pot 3, and the thermal efficiency is higher.

[0025] Obviously, since the travel speed of the calcium carbide car 2 is much slower than the travel speed of the airflow, an air inlet fan 9 is set at the entrance 4 of the tunnel 1, and an air outlet fan 8 is set at the exit 5 of the tunnel 1, so that the travel direction of the airflow is consistent with the travel direction of the calcium carbide car 2, which can also achieve the same heat collection effect.

[0026] exist Figure 1 In the embodiment, the air inlet fan 9 is arranged at the bottom of the tunnel 1 exit 5, and the air outlet fan 8 is arranged at the top of the tunnel 1 entrance 4. Obviously, as long as the air inlet fan 9 and the air outlet fan 8 are arranged at both ends of the tunnel 1 and have large power, the effect of air intake at one end and exhaust at the other end can be achieved.

[0027] like Figure 1 and Figure 5As shown, the calcium carbide car 2 includes a chassis 10, and the chassis 10 includes a chassis ventilation area 11 arranged in the middle and a chassis grille area 12 arranged on the side facing the air inlet fan 9. The chassis ventilation area 11 is a hollow hole, and the chassis grille area 12 is a grille structure with a plurality of ventilation holes. A chassis wind shield 13 facing the bottom of the tunnel 1 is arranged on the chassis 10 of the calcium carbide car 2 away from the air inlet fan 9, and the chassis wind shield 13 extends to the bottom wall of the tunnel 1.

[0028] Since a chassis grille area 12 is provided on the side of the chassis 10 facing the air inlet fan 9, and a chassis wind shield 13 extending downward to the bottom wall of the tunnel 1 is provided on the side away from the air inlet fan 9, the airflow can only enter downward from the chassis grille area 12 to the bottom of the chassis 10 of the calcium carbide car 2, and enter the calcium carbide pot 3 upward from the chassis ventilation area 11.

[0029] like Figure 1-Figure 3 As shown, the calcium carbide pot 3 includes a pot body 14 and a pot cover 15. A through pipe 16 with upper and lower openings is arranged in the center of the bottom of the pot body 14. The through pipe 16 is located above the chassis ventilation area 11 of the calcium carbide vehicle 2; the pot cover 15 is provided with a pot cover wind shield 17 facing the top of the tunnel 1 on the side facing the air inlet fan 9, and the pot cover wind shield 17 extends upward to the top wall of the tunnel 1. A pot cover grille area 18 is arranged in the middle of the pot cover 15 at a position corresponding to the through pipe 16 of the pot body 14. The pot cover grille area 18 is a grille structure with a plurality of ventilation holes.

[0030] like Figure 1 As shown, the bottom shape of the central through pipe 16 of the pot body 14 is consistent with the shape of the chassis ventilation area 11 of the calcium carbide car 2, and the shape of the pot cover grille area 18 is consistent with the top shape of the central through pipe 16. Figure 3 As shown, the height of the through pipe 16 is consistent with the height of the pot body 14, and the radius of the through pipe 16 gradually decreases from the chassis 10 of the calcium carbide car 2 to the pot cover 15 of the calcium carbide pot 3.

[0031] Due to the existence of the through pipe 16, the calcium carbide pot 3 is a hollow annular structure. On the one hand, the wind passes through the through pipe 16 to form a smooth airflow path, and on the other hand, the calcium carbide mass formed in the calcium carbide pot 3 is a hollow annular structure. Without the intermediate structure where heat is difficult to volatilize, heat can be dissipated faster and carried away by the airflow passing through the through pipe 16 to recover waste heat.

[0032] like Figure 1 and Figure 2As shown, in order to facilitate the pouring of molten calcium carbide into the pot body 14 of the calcium carbide pot 3, an inlet groove 19 is provided on the pot body 14 of the calcium carbide pot 3; and in order to facilitate the observation of the pouring amount of molten calcium carbide in the pot body 14 of the calcium carbide pot 3, an overflow groove 20 is provided on the pot body 14 of the calcium carbide pot 3. When the molten calcium carbide fills the calcium carbide pot 3, molten calcium carbide will overflow from the overflow groove 20.

[0033] like Figure 1 and Figure 4 As shown, in order to facilitate the lifting of the pot cover 15 of the calcium carbide pot 3, a hook 23 is provided in the center of the grille area 18 of the pot cover of the calcium carbide pot 3, and the grilles of the grille area 18 of the pot cover of the calcium carbide pot 3 are arranged radially.

[0034] Embodiment 2: In order to ensure the sealing between the calcium carbide car 2 and the inner wall of the tunnel 1 during movement, as shown in FIG. Figure 6 As shown, a brush 21 is provided on one side of the chassis windshield 13 close to the bottom wall of the tunnel 1, and a brush 21 is provided on one side of the pot cover windshield 17 close to the top wall of the tunnel 1, then the positions where the calcium carbide car 2 is connected to the top wall and bottom wall of the tunnel 1 are all connected through dense brushes 21, and the gap between the calcium carbide car 2 and the inner wall of the tunnel 1 is minimized, ensuring that most of the airflow flows in an S-shaped path from the upper and lower directions of each calcium carbide car 2, and the airflow flows in a lateral path from the gap between the calcium carbide car 2 and the inner wall of the tunnel 1 as much as possible. During installation, a slot 24 can be reserved on the chassis windshield 13 and the pot cover windshield 17, and the brush 21 is inserted into the slot 24, and the two sides are clamped with L-shaped steel plates, and then fastened with bolts to complete.

[0035] The method of using the present invention is as follows: molten calcium carbide is injected into the calcium carbide pot 3 from the introduction groove 19, the pot cover 15 of the calcium carbide pot 3 is covered on the pot body 14, and when molten calcium carbide begins to appear in the overflow groove 20, the calcium carbide pot 3 is filled with the filling and the calcium carbide pot 3 filled with molten calcium carbide enters the tunnel 1 along the travel track under the action of the calcium carbide car 2. At this time, the rolling door 6 of the entrance 4 of the tunnel 1 is rolled up, and the rolling door 6 of the exit 5 of the tunnel 1 falls down. The wind curtain generating device 7 at the entrance 4 and exit 5 of the tunnel 1 is turned on, and the air flow is vertically sprayed downward from the top of the tunnel 1 to block the air from entering from both ends of the tunnel 1; at the same time, the air inlet fan 9 and the air outlet fan 8 are started, and the wind begins to flow in the tunnel 1. As the calcium carbide cars 2 gradually enter the tunnel 1, the air flow passes through the calcium carbide cars 2 one by one in an S shape from the position of the air inlet fan 9, and takes away the heat emitted by the calcium carbide pot 3, and gathers at the air outlet fan 8, and is collected through the recovery pipeline 22 for utilization. When the calcium carbide is cooled, the rolling door 6 of the tunnel 1 exit 5 is rolled up, the calcium carbide car 2 leaves the tunnel 1, and the calcium carbide lump in the calcium carbide pot 3 is subjected to other treatments.

[0036] The above is only a preferred embodiment of the present invention. It should be pointed out that for ordinary technicians in this technical field, several improvements and modifications can be made without departing from the technical principles of the present invention. These improvements and modifications should also be regarded as the scope of protection of the present invention.

Claims

1. A calcium carbide sensible heat wind medium heat extraction system for waste heat recovery, comprising a tunnel, wherein a plurality of calcium carbide cars are arranged in sequence in the tunnel, wherein the calcium carbide cars are provided with calcium carbide pots, and the calcium carbide cars travel along a travel track at the bottom of the tunnel, characterized in that: The tunnel comprises an entrance and an exit, rolling doors are arranged at the entrance and the exit, and wind curtain generating devices are arranged inside the rolling doors at the entrance and the exit. The direction of the high-speed airflow generated by the wind curtain generating device is perpendicular to the direction of travel of the calcium carbide vehicle, and an air inlet fan and an air outlet fan are arranged at both ends of the tunnel respectively; The calcium carbide vehicle comprises a chassis, the chassis comprises a chassis ventilation area arranged in the middle and a chassis grille area arranged on the side facing the air inlet fan, the chassis ventilation area is a hollow hole, the chassis grille area is a grille structure with a plurality of ventilation holes, a chassis windshield facing the bottom of the tunnel is arranged on the chassis of the calcium carbide vehicle on the side facing away from the air inlet fan, and the chassis windshield extends to the bottom wall of the tunnel; The calcium carbide pot includes a pot body and a pot cover. A through pipe with upper and lower openings is arranged in the center of the bottom of the pot body. The through pipe is located above the ventilation area of ​​the calcium carbide vehicle chassis. A pot cover wind shield facing the top of the tunnel is arranged on the side of the pot cover facing the air inlet fan. The pot cover wind shield extends upward to the top wall of the tunnel. A pot cover grille area is arranged in the middle of the pot cover at a position corresponding to the through pipe of the pot body. The pot cover grille area is a grille structure with a plurality of ventilation holes.

2. The calcium carbide sensible heat wind medium heat extraction system for waste heat recovery according to claim 1 is characterized in that: The air inlet fan is arranged at the bottom of the tunnel exit, and the air outlet fan is arranged at the top of the tunnel entrance.

3. The calcium carbide sensible heat wind medium heat extraction system for waste heat recovery according to claim 1 is characterized in that: The height of the central through pipe is consistent with the height of the pot body.

4. The calcium carbide sensible heat wind medium heat extraction system for facilitating waste heat recovery according to claim 1 is characterized in that: The radius of the through pipe gradually decreases from the direction of the calcium carbide carbide vehicle chassis to the direction of the calcium carbide pot cover.

5. The calcium carbide sensible heat wind medium heat extraction system for facilitating waste heat recovery according to claim 1 is characterized in that: The bottom shape of the through pipe of the pot body is consistent with the shape of the chassis ventilation area of ​​the calcium carbide vehicle, and the shape of the pot cover grille area is consistent with the top shape of the through pipe.

6. The calcium carbide sensible heat wind medium heat extraction system for waste heat recovery according to claim 1 is characterized in that: The calcium carbide pot body is provided with an inlet groove and an overflow groove.

7. The calcium carbide sensible heat wind medium heat extraction system for waste heat recovery according to claim 1 is characterized in that: A hook is arranged in the center of the grille area of ​​the calcium carbide pot cover.

8. The calcium carbide sensible heat wind medium heat extraction system for waste heat recovery according to claim 1 is characterized in that: A brush is arranged on one side of the chassis wind shield plate close to the bottom wall of the tunnel, and a brush is arranged on one side of the pot cover wind shield plate close to the top wall of the tunnel.

9. The calcium carbide sensible heat wind medium heat extraction system for waste heat recovery according to claim 1 is characterized in that: A pipe is provided below the chassis ventilation area of ​​the first calcium carbide car along one side of the air inlet fan in the tunnel, and the pipe is connected to the air inlet fan.

10. The calcium carbide sensible heat wind medium heat extraction system for waste heat recovery according to claim 1 is characterized in that: A pipeline is arranged above the calcium carbide pot of the second calcium carbide car along one side of the air outlet fan in the tunnel, and the pipeline is connected to the air outlet fan.

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