Calcium carbide sensible heat utilization system based on heat removal medium cyclic utilization

Abstract

The invention relates to a calcium carbide sensible heat utilization technology, in particular to a calcium carbide sensible heat utilization system based on cyclic utilization of a heating medium. A calcium carbide sensible heat utilization system based on heat removal medium cyclic utilization comprises a calcium carbide tundish, the calcium carbide tundish is connected with a rotary cylinder through a calcium carbide flowing groove, the two ends of the rotary cylinder are open, and an air inlet buffer chamber and an exhaust buffer chamber are arranged at the discharging end and the feeding end of the rotary cylinder respectively; a rotary gear ring is arranged on the outer wall of the rotary cylinder, the rotary gear ring is matched with a rotary motor, and the rotary cylinder is driven by the rotary motor to continuously rotate; and a scraping device is arranged in the rotary cylinder. According to the calcium carbide sensible heat utilization system, a traditional technology of using a calcium carbide pot for cooling is changed, high-speed heat taking flow is directly used for impacting calcium carbide liquid into scattered falling materials for cooling, heat is conveniently absorbed by the high-speed heat taking flow, sensible heat is utilized, heat taking gas media can be recycled, and energy conservation and environment protection are achieved.

Description

Technical Field

[0001] The invention relates to calcium carbide sensible heat utilization technology, and in particular to a calcium carbide sensible heat utilization system based on the recycling of heat extraction media. Background Art

[0002] Calcium carbide is an important raw material that is widely used in acetylene production, chemical industry, steel, agriculture, environmental protection and other fields. However, calcium carbide production is a high-energy consumption industry. It usually takes 3000-3500 kWh of electricity to produce 1 ton of calcium carbide, of which 20% of the energy is wasted in the form of heat energy after the calcium carbide flows out of the electric furnace. The traditional calcium carbide cooling process is that after the calcium carbide flows out of the calcium carbide furnace, it is poured into the calcium carbide pot. After cooling in the calcium carbide pot, it enters the crushing workshop for crushing and packaging. Because the calcium carbide pot is an open device, after the calcium carbide is injected into the calcium carbide pot, the temperature drops rapidly from 1800°C to the surface temperature of the calcium carbide pot of 600°C. This stage is short and the heat cannot be recycled. At present, the heat recovery of the calcium carbide pot cooling production process mainly adopts the tunnel ventilation method to reduce the outer wall temperature of the calcium carbide pot to 600℃ for heat recovery. On the one hand, the calcium carbide block is huge in size and the thermal conductivity of calcium carbide is very low. The heat inside the calcium carbide block is difficult to transfer to the outside, resulting in the low heat recovery efficiency of the tunnel ventilation heat collection method. On the other hand, the use of air as the heat medium increases the probability of nitrogen and oxygen in the air reacting with calcium carbide, which ultimately affects the quality of calcium carbide products. Summary of the invention

[0003] The purpose of the present invention is to overcome the deficiencies in the prior art and to provide a calcium carbide sensible heat utilization system based on the recycling of heat medium. This calcium carbide sensible heat utilization system changes the traditional calcium carbide cooling process using a calcium carbide pot, and uses a high-speed hot air flow to impact the calcium carbide liquid into scattered point cooling, which is convenient for the high-speed hot air flow to absorb heat and utilize sensible heat. The entire system is in a closed state, and the heat gas medium can be recycled, which is energy-saving, environmentally friendly and has high economic value.

[0004] In order to solve the problems of the prior art, the present invention discloses a calcium carbide sensible heat utilization system based on the recycling of heat medium, including a calcium carbide intermediate ladle, which is connected to a rotating drum through a calcium carbide flow groove, the rotating drum is open at both ends, and an air intake buffer chamber and an exhaust buffer chamber are respectively provided at both ends, the air intake buffer chamber is located at the end of the rotating drum where the calcium carbide is discharged, and the exhaust buffer chamber is located at the end of the rotating drum where the calcium carbide enters; a rotating gear ring is provided on the outer wall of the rotating drum, the rotating gear ring cooperates with a rotating motor, and the rotating drum continuously rotates under the drive of the rotating motor, and a scraper device is provided inside the rotating drum.

[0005] The exhaust buffer chamber is connected to the exhaust pipe, and the exhaust pipe is connected to the heat exchanger. The hot air after heat exchange in the heat exchanger is recycled through the recovery pipe, and the cold air after heat exchange in the heat exchanger is divided into two paths, one path passes through the air supply pipe I and the air intake buffer chamber to enter the discharge end of the rotary drum, and the other path passes through the air supply pipe II to enter the feed end of the rotary drum; a discharge hopper is arranged at the bottom of the air intake buffer chamber, and the discharge hopper is located at the position where the calcium carbide is discharged from the discharge end of the rotary drum.

[0006] Preferably, the rotating drum is open at both ends and is arranged at 10°-20° to the horizontal line. The position of the feeding end of the rotating drum is higher than that of the discharging end. Two rotating gear rings are arranged on the outer wall of the rotating drum, and each rotating gear ring is meshed with the motor gear of the rotating motor, and the module of the rotating gear ring is the same as that of the motor gear.

[0007] Preferably, the scraper device comprises a scraper base, a scraper disc is connected to the scraper base via a connecting rod, scraper knives are evenly spaced on the scraper disc, and the scraper knives are arranged at the inner wall position on one side of the feeding end of the rotary drum.

[0008] Preferably, a discharge plate is provided at the discharge port of the discharge hopper, the discharge plate is a double-plate structure, and the junction of the two plates is staggered, an elastic rubber pad is installed at the junction, and the discharge hopper and the discharge plate are connected by a spring hinge.

[0009] Preferably, the calcium carbide intermediate package is provided with a calcium carbide liquid inlet, and a sealing plate is provided at the position of the calcium carbide liquid inlet, and the sealing plate is movably connected to the calcium carbide intermediate package cover.

[0010] Preferably, the rotary drum is connected to the side walls of the intake buffer chamber and the exhaust buffer chamber in a groove-like manner, and refractory wool felt is installed at the groove connection surface.

[0011] Preferably, the outflow direction of the high-speed heat extraction medium is set at an upward angle of 15°-35° with the central axis of the rotary drum.

[0012] Preferably, the high-speed heat extraction medium is carbon dioxide gas.

[0013] Preferably, the exhaust pipe, air supply pipe I and air supply pipe II are all provided with instruments such as control valves, induced draft fans, carbon dioxide concentration meters and pressure gauges.

[0014] The working process of the present invention is as follows: the molten calcium carbide liquid flows into the calcium carbide tundish, and enters the feed end of the rotary drum through the calcium carbide flow groove, meets the high-speed heat medium flow, is impacted by the high-speed heat medium flow into a scattered state and falls into the rotary drum, cools into blocks, and continuously moves forward under the rotation of the rotary drum, falls into the discharge hopper, and is discharged. After the heat extraction is completed, the high-speed heat medium flow carries a large amount of heat, and exchanges heat with the heat exchanger through the exhaust pipe to achieve heat recovery.

[0015] The beneficial effects of the present invention are as follows: 1. High heat extraction temperature. The present invention changes the original cooling method of molten calcium carbide liquid in the calcium carbide pot, and instead uses a high-speed heat extraction medium flow to impact the molten calcium carbide liquid and make it fall in a scattered state. In this way, the high-speed heat extraction medium flow can extract heat from the heat that rapidly drops from 1800°C after the molten calcium carbide liquid comes out of the furnace, and the heat grade is higher. 2. High heat extraction efficiency. The molten calcium carbide flow is impacted by the high-speed heat extraction medium flow into a scattered state and falls, which avoids the problem of slow heat dissipation of calcium carbide lumps in the traditional cooling process, and the calcium carbide blocks falling in a scattered state are continuously thrown up and dropped under the continuous rotation of the rotary drum. Since the rotary drum is placed at an angle to the ground, and the position of the discharge end is lower than that of the feed end, with continuous throwing and falling, the calcium carbide blocks also continuously move forward until they fall into the unloading hopper. The state in which small pieces are constantly thrown up and dropped not only increases the heat extraction area, but also prolongs the heat extraction time, and the heat extraction efficiency is higher. 3. The heat extraction medium can be recycled. The entire system is in a nearly closed state, and the heat medium introduced can be recycled, avoiding the problem of constantly introducing the heat medium and reducing the heat cost. Using carbon dioxide gas as the heat medium can avoid reaction with calcium carbide and is low-cost. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 It is a schematic diagram of the overall structure of the present invention; Figure 2 It is a schematic diagram of the specific structure of the scraping device in the present invention; Figure 3 It is a structural schematic diagram of the unloading plate in the present invention.

[0017] Reference numerals: 1. Calcium carbide tundish; 2. Calcium carbide flow trough; 3. Rotating drum; 4. Air inlet buffer chamber; 5. Exhaust buffer chamber; 6. Rotating gear ring; 7. Rotating motor; 8. Scraping device; 81. Scraping base; 82. Connecting rod; 83. Scraping plate; 84. Scraping knife; 9. Ladle cover; 10. Sealing plate; 11. Exhaust duct; 12. Heat exchanger; 13. Air supply duct I; 14. Air supply duct II; 15. Discharge hopper; 16. Control valve; 17. Induced draft fan; 18. Carbon dioxide concentration meter; 19. Pressure gauge; 20. Discharge plate; 21. Isolation wall; 22. Recovery duct. DETAILED DESCRIPTION

[0018] 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.

[0019] like Figure 1 As shown, a calcium carbide sensible heat utilization system based on the recycling of heat medium includes a calcium carbide tundish 1, which is connected to a rotary drum 3 through a calcium carbide flow groove 2. The rotary drum 3 is open at both ends, and an air intake buffer chamber 4 and an exhaust buffer chamber 5 are respectively provided at both ends. The air intake buffer chamber 4 is located at the end of the rotary drum 3 where calcium carbide enters, and the exhaust buffer chamber 5 is located at the end of the rotary drum 3 where calcium carbide is discharged; a rotary gear ring 6 is provided on the outer wall of the rotary drum 3, and the rotary gear ring 6 cooperates with a rotary motor 7. Driven by the rotary motor 7, the rotary drum 3 continuously rotates; a scraper device 8 is provided inside the rotary drum 3.

[0020] The calcium carbide tundish 1 receives the molten calcium carbide flow discharged from the calcium carbide furnace, and discharges the molten calcium carbide flow from the calcium carbide flow trough 2 into the rotary drum 3. The calcium carbide tundish 1 has a cover 9 to isolate the air. Since the discharge of the calcium carbide furnace is staged, when the calcium carbide furnace stops discharging to the calcium carbide tundish 1, a sealing plate 10 is specially provided to prevent outside air from entering the calcium carbide tundish 1 from the calcium carbide liquid inlet. The sealing plate 10 is movably connected to the cover 9 of the calcium carbide tundish 1, and the sealing plate 10 is vertically arranged. When the discharge of the calcium carbide liquid is suspended, the sealing plate 10 falls downward from the cover 9 to cover the calcium carbide liquid inlet.

[0021] The rotating drum 3 is opened at both ends and is placed at an angle, preferably at 10°-20° to the horizontal line. The position of the calcium carbide liquid feeding end is higher than that of the discharging end, and the rotating gear ring 6 is driven by the rotating motor 7 to continuously rotate, thereby continuously throwing up and dropping the molten calcium carbide in the rotating drum 3. Due to the inclined setting, the molten calcium carbide continues to move forward. Since the temperature of the calcium carbide drops very quickly, it is quickly converted from a molten state to small solid pieces after falling until it is discharged.

[0022] The intake buffer chamber 4 and the exhaust buffer chamber 5 are arranged at both ends of the rotary drum 3, which play a buffering role and are also convenient for collecting carbon dioxide gas for pipeline transmission. In order to improve the sealing performance of the entire device, the side walls of the rotary drum 3 and the intake buffer chamber 4 and the exhaust buffer chamber 5 are connected by grooves, and refractory wool felt is installed at the position of the groove connection surface.

[0023] The exhaust buffer chamber 5 is connected to the exhaust pipe 11, and the exhaust pipe 11 is connected to the heat exchanger 12. The hot air after heat exchange in the heat exchanger 12 is recycled by the recovery pipe 22, and the cold air after heat exchange in the heat exchanger 12 is divided into two paths, one path passes through the air supply pipe Ⅰ13 and the air intake buffer chamber 4 to enter the discharge end of the rotary drum 3, and the other path passes through the air supply pipe Ⅱ14 and the exhaust buffer chamber 5 to enter the feed end of the rotary drum 3; a discharge hopper 15 is arranged at the bottom of the air intake buffer chamber 4, and the discharge hopper 15 is located at the position where the calcium carbide is discharged from the discharge end of the rotary drum 3.

[0024] The exhaust pipe 11, the air supply pipe I 13 and the air supply pipe II 14 are all provided with instruments such as a control valve 16, an induced draft fan 17, a carbon dioxide concentration meter 18 and a pressure gauge 19, so as to control, guide and monitor the transmission of carbon dioxide.

[0025] Since the molten calcium carbide will adhere to the inner wall of the feeding end of the rotary drum after falling in scattered spots, a scraper device 8 is required. After the calcium carbide falls, its temperature drops at a very fast speed, and the calcium carbide quickly changes from a molten liquid state to a solidified solid state. Therefore, the scraper device 8 only needs to be set at the feeding end of the rotary drum 3. In the subsequent movement process, it will be solidified and will gradually move during the rotation process without adhering to the inner wall. Figure 2 As shown, the scraper device 8 includes a scraper base 81, on which a scraper disc 83 is connected via a connecting rod 82, and on which scraper disc 83 are evenly spaced scraper blades 84, which are in contact with the inner wall of the rotary drum 3. The scraper blades 84 are arranged at intervals of 45°, and 8 scraper blades 84 are arranged on the scraper disc 83. The scraper blades 84 are fixed structures, and the rotary drum 3 rotates continuously, and the scraper blades 84 continuously clean the calcium carbide adhered to the inner wall. Since calcium carbide is an inorganic compound, the metal connection between it and the inner wall of the rotary drum 3 after cooling is not so tight, so the scraper blade 84 does not need to be arranged close to the inner wall of the rotary drum 3, but has a certain distance from the inner wall of the rotary drum 3. As long as the end of the scraper blade 84 can scrape the head end of the calcium carbide spot material, the two move relative to each other under the rotation of the rotary drum 3, and the calcium carbide spot material can be scraped off.

[0026] like Figure 3As shown, a discharge plate 20 is provided at the discharge port of the discharge hopper 15. The discharge plate 20 is a double-plate structure, and the intersection of the two plates is staggered. An elastic rubber pad is installed at the intersection. The discharge hopper 15 and the discharge plate 20 are connected by a spring hinge. The calcium carbide falling into the discharge hopper 15 has become a small block of cooled solid state. In order to avoid the continuous falling and the entry of external air, a discharge plate 20 that can automatically rebound is provided at the discharge port of the discharge hopper 15. The discharge plate 20 and the discharge hopper 15 are connected by a spring hinge. When the material accumulates to a certain extent, its gravitational potential energy breaks through the elastic potential energy of the spring hinge in the discharge plate 20, and the intersection of the two discharge plates 20 opens downward to discharge the small pieces of calcium carbide.

[0027] The outflow direction of the high-speed heat extraction medium is set at an upward angle difference of 15°-35° with the central axis of the rotary drum 3, and the high-speed heat extraction medium is carbon dioxide gas.

[0028] In the whole system, on the one hand, heat is extracted and on the other hand, heat is exchanged, and the two are connected by a pipeline, wherein high-speed carbon dioxide gas is used as the heat extraction medium, which impacts the molten calcium carbide flow into a scattered state and absorbs the heat therein, and enters the heat exchanger 12 from the exhaust pipe 11 for heat exchange, and the high-speed carbon dioxide gas flow that is cooled after the heat exchange is divided into two paths and enters the discharge end and the feed end of the rotary drum 3 from the air supply pipe Ⅰ13 and the air supply pipe Ⅱ14 respectively, wherein the high-speed carbon dioxide gas flow in the air supply pipe Ⅱ13 can extract heat from the high-temperature molten calcium carbide at the feed end of the rotary drum 3, and the air supply pipe Ⅰ14 enters from the discharge end of the rotary drum 3 and is discharged from the feed end, so as to extract heat from the calcium carbide in the entire rotary drum 3, and the two airflows converge in the air intake buffer chamber 4 and enter the heat exchanger 12 from the exhaust pipe 11, thereby realizing the whole heat extraction process.

[0029] In order to improve production safety, a separation wall 21 is provided between the devices for heat extraction and heat exchange functions.

[0030] In order to achieve the sealing of the system, many measures have been taken, such as setting a sealing plate 10 at the calcium carbide inlet of the calcium carbide ladle 1, the side walls of the air intake buffer chamber 4 and the exhaust buffer chamber 5 of the rotary drum 3 are connected by grooves, and the discharge hopper 15 and the discharge plate 20 are connected by an automatic rebound spring hinge.

[0031] When in use, the air in the system needs to be evacuated first, and then a certain pressure of carbon dioxide gas is filled in, and then the calcium carbide liquid enters the calcium carbide tundish 1 to start the heat exchange process. Generally speaking, during the air evacuation process of the system, the pressure gauge 19 in the pipeline shows that the pressure in the system must be below 300Pa before carbon dioxide gas can be filled in. When the filled carbon dioxide gas reaches 3 atmospheres, open the valves on the exhaust pipeline 11, the air supply pipeline I13 and the air supply pipeline II14 to start the carbon dioxide circulation heat extraction stage. When the carbon dioxide concentration meter 18 installed on the pipeline shows that the purity of carbon dioxide is less than 50%, the gas in the pipeline is evacuated, and carbon dioxide is re-injected to enter a new heat extraction cycle stage.

[0032] 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 utilization system based on the recycling of heat medium, comprising a calcium carbide tundish, characterized in that: The calcium carbide tundish is connected to the rotary drum via a calcium carbide flow trough. The two ends of the rotary drum are open, and an air intake buffer chamber and an exhaust buffer chamber are respectively arranged at the two ends. The air intake buffer chamber is located at the end of the rotary drum where calcium carbide is discharged, and the exhaust buffer chamber is located at the end of the rotary drum where calcium carbide is entered; a rotary gear ring is arranged on the outer wall of the rotary drum, and the rotary gear ring cooperates with the rotary motor. The rotary drum rotates continuously under the drive of the rotary motor, and a scraper device is arranged inside the rotary drum; The exhaust buffer chamber is connected to the exhaust pipe, and the exhaust pipe is connected to the heat exchanger. The hot air after heat exchange in the heat exchanger is recycled from the recovery pipe, and the cold air after heat exchange in the heat exchanger is divided into two paths, one path passes through the air delivery pipe I and the air intake buffer chamber to enter the discharge end of the rotary drum, and the other path passes through the air delivery pipe II to enter the feed end of the rotary drum; A discharge hopper is arranged at the bottom of the air inlet buffer chamber, and the discharge hopper is located at the position where the calcium carbide is discharged from the discharge end of the rotary drum.

2. The calcium carbide sensible heat utilization system based on the recycling of heat medium according to claim 1 is characterized by: The rotating drum is open at both ends and is arranged at 10°-20° with the horizontal line. The position of the feeding end of the rotating drum is higher than the position of the discharging end. Two rotating gear rings are arranged on the outer wall of the rotating drum, and each rotating gear ring is meshed with the motor gear of the rotating motor, and the module of the rotating gear ring is the same as that of the motor gear.

3. The calcium carbide sensible heat utilization system based on the recycling of heat medium according to claim 1 is characterized in that: The scraper device comprises a scraper base, a scraper disc is connected to the scraper base via a connecting rod, scraper knives are evenly arranged on the scraper disc, and the scraper knives are arranged at the inner wall position of one side of the feeding end of the rotary drum.

4. The calcium carbide sensible heat utilization system based on the recycling of heat medium according to claim 1 is characterized in that: A discharge plate is arranged at the discharge port of the discharge hopper. The discharge plate is a double-plate structure, and the intersection of the two plates is staggered. An elastic rubber pad is installed at the intersection. The discharge hopper and the discharge plate are connected by a spring hinge.

5. The calcium carbide sensible heat utilization system based on the recycling of heat medium according to claim 1 is characterized in that: The calcium carbide tundish is provided with a calcium carbide liquid inlet, and a sealing plate is provided at the position of the calcium carbide liquid inlet, and the sealing plate is movably connected to the calcium carbide tundish cover.

6. The calcium carbide sensible heat utilization system based on the recycling of heat medium according to claim 1 is characterized by: The rotary drum is connected to the side walls of the air intake buffer chamber and the exhaust buffer chamber in a groove-type manner, and fire-resistant cotton felt is installed at the position of the groove connection surface.

7. The calcium carbide sensible heat utilization system based on the recycling of heat medium according to claim 1 is characterized by: The outflow direction of the high-speed heat extraction medium is set at an upward angle difference of 15°-35° with the central axis of the rotary drum.

8. The calcium carbide sensible heat utilization system based on the recycling of heat medium according to claim 1 is characterized by: The high-speed heat extraction medium is carbon dioxide gas.

9. The calcium carbide sensible heat utilization system based on the recycling of heat medium according to claim 1 is characterized by: The exhaust pipe, air supply pipe I and air supply pipe II are all provided with instruments such as control valves, induced draft fans, carbon dioxide concentration meters and pressure gauges.

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