Waste heat resource recycling system for steel-making furnace slag

Abstract

The invention relates to the technical field of steelmaking, in particular to a steelmaking slag waste heat resource recycling system which comprises a base and a circular conveying cylinder, a conveying cavity used for conveying slag is formed in the conveying cylinder, a feeding port is formed in the higher end of the conveying cylinder, a discharging port is formed in the lower end of the conveying cylinder, and a rotating shaft is rotationally installed in the conveying cavity; a spiral conveying blade is arranged on the rotating shaft, a driving assembly is arranged on the conveying cylinder, a heat exchange assembly is further arranged on the conveying cylinder and comprises a liquid heat exchange cavity, a water inlet and a water outlet are formed in the liquid heat exchange cavity, the water inlet is formed in the higher end of the liquid heat exchange cavity, and the water outlet is formed in the lower end of the liquid heat exchange cavity. The heat exchange liquid for heat exchange is separated from the furnace slag, so that recovery of waste heat in the furnace slag is guaranteed, and waste of water resources is avoided. And through the arrangement of the water inlet and the water outlet, waste heat in the furnace slag can be quickly recycled.

Description

Technical Field

[0001] The invention relates to the technical field of steelmaking, and in particular to a waste heat resource recovery system for steelmaking slag. Background Art

[0002] During the carbon steel smelting process, the carbon steel needs to be heated, and a large amount of slag will be left after the smelting is completed. The temperature of the slag is very high and contains a large amount of heat. In order to improve the utilization rate of energy, the waste heat of the slag is usually recycled and utilized.

[0003] The existing technology for recovering waste heat from slag produced by steelmaking usually places the slag in water, and the water absorbs and stores the heat of the slag. However, the slag left after carbon steel smelting also contains elements such as silicon, manganese, sulfur, and phosphorus. The water used to absorb the heat of the slag is easily contaminated after contact with the slag. The contaminated water must be treated before it can be discharged or used normally, which consumes a lot of resources.

[0004] The Chinese invention patent with application number CN202111658874.2 and patent name "A Steelmaking Slag Waste Heat Recovery System" uses a spraying method to recover the energy of the slag. Compared with directly soaking the slag in water, it saves more water resources, but it still requires water to come into direct contact with the slag. The water vapor formed after the sprayed water comes into contact with the slag will still be contaminated by the slag.

[0005] Therefore, a waste heat resource recovery system of steelmaking slag is proposed. Summary of the invention

[0006] The purpose of the present invention is to provide a waste heat resource recovery system for steelmaking slag to solve the problem of water resource pollution when recovering the waste heat from the slag.

[0007] To achieve the above object, the present invention provides the following technical solutions:

[0008] A waste heat resource recovery system for steelmaking slag comprises a base and a circular conveying cylinder, the conveying cylinder is fixedly installed on the base at an angle, a conveying chamber for conveying slag is arranged inside the conveying cylinder, a feed port is provided at a higher end of the conveying cylinder, a discharge port is provided at a lower end of the conveying cylinder, a rotating shaft is coaxially installed with the conveying cylinder inside the conveying chamber, a spiral conveying blade is provided on the rotating shaft, a driving component for driving the rotating shaft to rotate is provided on the conveying cylinder, a heat exchange component for recovering waste heat of slag is also provided on the conveying cylinder, the heat exchange component comprises a liquid heat exchange chamber for transferring heat exchange liquid, the liquid heat exchange chamber is coaxially covered on the outside of the conveying chamber, a water inlet and a water outlet are respectively provided on the liquid heat exchange chamber, the water inlet is arranged at the higher end of the liquid heat exchange chamber, and the water inlet is located at the lower side of the end of the higher end of the liquid heat exchange chamber, the water outlet is arranged at the lower end of the liquid heat exchange chamber, and the water outlet is located at the upper side of the end of the lower end of the heat exchange chamber.

[0009] The conveying tube is set up so that the slag enters the conveying chamber from the upper feed port, naturally rolls down by gravity, and finally is discharged from the outside of the conveying chamber from the discharge port. The spiral conveying blades rotate with the shaft driven by the driving assembly. The conveying blades do not need to push the slag to move, but only control the falling speed of the slag by rotation, thereby saving energy. When the slag enters the conveying chamber, the slag contacts the inner wall of the conveying tube, and the slag transfers heat to the conveying tube. The outer surface of the conveying tube is coated with a liquid heat exchange chamber, and the liquid heat exchange chamber is filled with heat exchange liquid, wherein the heat exchange liquid can be water or other liquids. Then the conveying tube transfers the heat to the heat exchange liquid inside the liquid heat exchange chamber to realize the heat recovery of the slag. The heat exchange liquid does not contact the slag, and the silicon, manganese, sulfur, phosphorus and other elements contained in the slag will not pollute the heat exchange liquid.

[0010] In addition to transferring heat to the conveying cylinder through direct contact, the slag also dissipates heat into the air inside the conveying cylinder and transfers heat to the conveying cylinder through the air. Since the liquid heat exchange chamber is annularly wrapped outside the conveying cylinder, the heat exchange liquid in the liquid heat exchange chamber can absorb the heat on the conveying cylinder in all directions, ensuring the efficiency of heat exchange.

[0011] In addition, the water inlet is arranged at the higher end of the liquid heat exchange chamber, and the water outlet is arranged at the lower end of the liquid heat exchange chamber. This is because the slag has the highest temperature when it enters the conveying chamber. Setting the water inlet at the higher end of the liquid heat exchange chamber can form the largest temperature difference between the temperature of the conveying chamber near the feed port and the temperature of the slag, thereby increasing the energy recovery rate. And because cold water will sink and hot water will rise, the cold water will be at the bottom of the liquid heat exchange chamber, and the cold water will become hot after heat exchange with the slag, and the hot water will go to the top of the liquid heat exchange chamber, so the bottom temperature of the conveying chamber will be lower than the top temperature. The slag is also transported at the bottom of the conveying chamber, so when the slag near the feed port enters the conveying chamber, the temperature difference between the slag and the heat exchange liquid will remain at the maximum state.

[0012] Preferably, the heat exchange component also includes an air pump for blowing air into the conveying chamber, and the air pump is arranged on the lower end of the conveying cylinder. A gas heat exchange chamber is also arranged outside the liquid heat exchange chamber, and the gas heat exchange chamber is coaxially covered with the outside of the liquid heat exchange chamber. A vent pipe is arranged on the conveying cylinder, and the vent pipe connects the gas heat exchange chamber and the conveying chamber. The vent pipe is located directly above the conveying cylinder near the feed port. An exhaust hole for discharging the gas inside the gas heat exchange chamber is also arranged at the lower end of the gas heat exchange chamber, and a door panel for closing the feed port is arranged at the feed port.

[0013] The air pump blows air into the conveying chamber. After the air enters the conveying chamber, it cools the slag and absorbs the heat of the slag. Since the door panel closes the feed port, the air conveyed into the conveying chamber by the air pump can only enter the gas heat exchange chamber from the vent pipe. The gas heat exchange chamber is wrapped around the outside of the liquid heat exchange chamber, and the air that absorbs the heat of the slag reheats the liquid heat exchange chamber from the outside of the liquid heat exchange chamber. The cooperation between air and heat exchange liquid further improves the rate of resource recovery of slag waste heat.

[0014] Preferably, the door panel is rotatably arranged in the conveying cavity, the door panel opens toward the conveying cavity, a torsion spring is arranged at the rotating shaft of the door panel, and the torsion spring is used to keep the door panel pushed toward the feed port to close the feed port.

[0015] The torsion spring keeps the door panel closed to ensure that the gas pumped into the conveying chamber by the air pump will not be directly discharged from the conveying chamber after absorbing the waste heat of the slag, so as to ensure the recovery rate of the waste heat of the slag. The door panel rotates toward the inside of the conveying chamber because the conveying blades are spiral and difficult to process and replace. The door panel rotates toward the inside of the conveying chamber to cooperate with the torsion spring to first bear the impact of the slag, thereby reducing the impact of the slag on the conveying blades when entering the conveying chamber, and avoiding the conveying blades being damaged by the impact of the slag for a long time.

[0016] Preferably, a plurality of scrapers are fixedly installed between each pitch of the spiral conveying blade, the scrapers are located at the edge of the conveying blade, and inclined guide slopes are provided on the left and right sides of the scrapers.

[0017] The scraper fits the inner wall of the conveying chamber. When it rotates with the conveying blades, the scraper will scrape the inner wall of the conveying chamber to prevent the slag from adhering to the inner wall of the conveying chamber and affecting the subsequent rolling of the slag. This prevents blockage inside the conveying chamber and ensures the smooth operation of the equipment. The guide slope is to facilitate the slag to smoothly cross the scraper and continue to roll toward the discharge port. In addition, when the scraper rotates with the conveying blades, it can prevent the slag from accumulating between the pitches of the conveying blades and not continuing to roll.

[0018] Preferably, a plurality of paddle plates are provided between each pitch of the conveying blades, the plurality of paddle plates correspond one-to-one to the plurality of scrapers, the paddle plates are located between the scrapers and the rotating shaft, and a flattening gap is provided between the paddle plates and the scrapers.

[0019] After setting the leveling gap, the amount of slag that passes over the scraper each time can be limited, and the slag can be in flat contact with the conveying tube, avoiding excessive accumulation of slag during transportation and not being able to fully contact the conveying tube. After the slag is leveled, the slag can fully contact the conveying tube and the air pumped into the conveying tube, further improving the heat exchange efficiency of the slag, thereby improving the recovery efficiency of the slag heat energy.

[0020] Preferably, a plurality of annular first baffles are fixedly installed on the inner wall of the gas heat exchange chamber close to the liquid heat exchange chamber, and the first baffles do not contact the inner wall of the gas heat exchange chamber away from the liquid heat exchange chamber; a plurality of annular second baffles are fixedly installed on the inner wall of the gas heat exchange chamber away from the liquid heat exchange chamber, and the second baffles do not contact the inner wall of the gas heat exchange chamber close to the liquid heat exchange chamber; the plurality of first baffles and the plurality of second baffles are alternately arranged.

[0021] The first baffle plate and the second baffle plate are arranged alternately, which increases the distance required for the gas to flow through the gas heat exchange chamber, increases the time the gas stays inside the gas heat exchange chamber, ensures that the gas can fully transfer heat to the heat exchange liquid inside the liquid heat exchange chamber for storage, and avoids heat waste. Since the first baffle plate is located on the inner wall of the gas heat exchange chamber close to the liquid heat exchange chamber, it is equivalent to increasing the surface area of ​​the outer wall of the liquid heat exchange chamber. When the gas contacts the first baffle plate, it transfers heat to the first baffle plate, and the first baffle plate can quickly transfer heat to the liquid heat exchange chamber, further improving the recovery efficiency of the slag waste heat.

[0022] Preferably, a classification port is provided on the lower side of the conveying cylinder, and a classification box is fixedly installed on the outside of the conveying cylinder. The classification box is connected to the conveying chamber through the classification port. A sealing plate is rotatably provided at the classification port. A first spring is provided in the classification box, and the first spring is used to keep the sealing plate pushed toward the classification port to close the classification port.

[0023] Normally, the first spring drives the sealing plate to close the classification port. When the volume of the slag is too large to pass through the flattening gap, the scraper and the paddle will drive the slag that cannot pass through the flattening gap to rotate together. When passing through the classification port, large pieces of slag will squeeze the sealing plate under the action of their own gravity, and the first spring will be compressed, the sealing plate will move and open the classification port, and the large pieces of slag will fall into the classification box and be collected. After that, the first spring will drive the sealing plate to reclose the classification port under the action of elastic force. Prevent large pieces of slag from following the paddle plate to rotate through the flattening gap and affecting the subsequent flattening of the slag. In addition, the slag that cannot pass through the flattening gap will fall under the action of its own gravity after following the paddle plate to rotate to the upper side of the conveying tube, which can easily cause damage to the conveying tube.

[0024] Preferably, a filter screen is provided inside the vent pipe, a convex ring is provided on the side of the filter screen facing the delivery chamber, and a second spring is also provided inside the vent pipe, and the convex ring is used to keep the convex ring extending from the vent pipe into the delivery chamber. The filter screen filters dust from the air entering the gas heat exchange chamber to prevent dust from entering the gas heat exchange chamber and accumulating in the gap between the first baffle plate and the second baffle plate to affect the air from transferring heat to the liquid heat exchange chamber. Under the action of the second spring, the convex ring always extends from the vent pipe into the delivery chamber, and when the scraper passes through the vent pipe, the scraper squeezes the convex ring and presses the convex ring and the filter screen toward the direction of the vent pipe. When the scraper leaves the vent pipe, the second spring pushes the convex ring and the filter screen toward the delivery chamber. In this way, the filter screen can be vibrated by the elastic force of the second spring to shake off the dust accumulated on the filter screen and avoid clogging of the filter screen.

[0025] Preferably, the side of the paddle facing the scraper is provided with a circular roller for rotation. If the flattening gap is blocked, it is easy to cause all the slag to pile up together and rotate along with the paddle that blocks the flattening gap, which is not conducive to the contact between the slag and the conveying tube, and is not conducive to the recovery of the slag waste heat resources. The provision of circular rollers helps to prevent the slag from getting stuck in the flattening gap, avoids the flattening gap from being blocked, ensures that the slag can pass through the flattening gap smoothly and be evenly flattened by the flattening gap at the bottom of the conveying tube, thereby ensuring the recovery efficiency of waste heat.

[0026] Preferably, the angle between the inclined conveying tube and the horizontal direction is 10° to 20°. Because the recovery of the heat energy of the slag is not in direct contact with the heat exchange fluid, when the inclination angle is greater than 20°, the slag rolls down too fast, which causes the slag to stay in the conveying chamber for too short a time, and then causes the residual heat of the slag to fail to be recovered in time and to roll out of the conveying chamber with a large amount of residual heat, which is not conducive to the recovery of the residual heat of the slag. When the angle is less than 10°, because the conveying tube is too flat, the slag cannot roll down by itself under its own gravity, which easily causes the slag to accumulate inside the conveying chamber. The angle of 10° to 20° can ensure that the heat energy of the slag can be recovered as much as possible, and can also ensure that the slag can roll down naturally under the action of gravity without the need for additional driving force.

[0027] Compared with the prior art, the present invention has the following beneficial effects:

[0028] 1. The waste heat resource recovery system of steelmaking slag designed by the present invention separates the heat exchange liquid and the slag by setting a conveying chamber and a liquid heat exchange chamber, which not only ensures the recovery of waste heat in the slag, but also does not pollute the heat exchange liquid and avoids the waste of water resources. And the waste heat in the slag can be quickly recovered by setting the water inlet and the water outlet.

[0029] 2. The waste heat resource recovery system of steelmaking slag designed by the present invention is also provided with an air pump and a gas heat exchange chamber. After the slag is further heated by the gas, the gas carrying the heat is allowed to enter the gas heat exchange chamber to further heat the liquid heat exchange chamber, and then the heat is transferred to the inside of the heat exchange liquid, thereby further improving the recovery efficiency of the slag waste heat.

[0030] 3. A waste heat resource recovery system for steelmaking slag designed by the present invention is also provided with a scraper and a paddle, and a flattening gap is provided between the scraper and the paddle. The slag is evenly flattened on the inner wall of the conveying tube by utilizing the flattening gap through the rotation of the conveying blades, so that the slag can contact the conveying tube and the air with a more uniform thickness and a larger area, which is convenient for the heat exchange liquid and air to recover the waste heat of the slag, and further improves the recovery efficiency and recovery effect of the waste heat of the slag. BRIEF DESCRIPTION OF THE DRAWINGS

[0031] Figure 1 It is a front perspective view of the present invention;

[0032] Figure 2 is a rear perspective view of the present invention;

[0033] Figure 3 It is a front view of the present invention;

[0034] Figure 4 It is a right side view of the present invention;

[0035] Figure 5 It is a three-dimensional diagram of the internal structure of the conveying tube in the present invention;

[0036] Figure 6 For the present invention Figure 5 The enlarged view of point A in the middle;

[0037] Figure 7 A schematic diagram of the relationship between the delivery chamber, the liquid heat exchange chamber and the gas heat exchange chamber in the present invention;

[0038] Figure 8 A cross-sectional view of the installation relationship between the classification box and the conveying cylinder in the present invention

[0039] Fig. 9 It is a three-dimensional schematic diagram of the rotating shaft and the conveying blades;

[0040] Fig.10 It is a schematic diagram of the installation relationship between the scraper and the paddle in the present invention.

[0041] In the figure: 1. base; 2. conveying cylinder; 3. conveying chamber; 4. feed port; 5. discharge port; 6. rotating shaft; 7. conveying blade; 8. driving assembly; 9. liquid heat exchange chamber; 10. water inlet; 11. water outlet; 12. air pump; 13. gas heat exchange chamber; 14. vent pipe; 15. exhaust hole; 16. door panel; 17. torsion spring; 18. scraper; 19. guide slope; 20. paddle plate; 21. flattening gap; 22. first baffle plate; 23. second baffle plate; 24. classification port; 25. classification box; 26. sealing plate; 27. first spring; 28. filter screen; 29. ​​convex ring; 30. second spring; 31. round roller. DETAILED DESCRIPTION

[0042] See also Figures 1 to 10 The present invention provides a waste heat resource recovery system for steelmaking slag, and the technical scheme is as follows:

[0043] refer to Figures 1 to 5 as well as Fig. 9 and Fig.10A waste heat resource recovery system for steelmaking slag comprises a base 1 and a circular conveying cylinder 2, the conveying cylinder 2 is fixedly installed on the base 1 in an inclined manner, and the angle between the inclined conveying cylinder 2 and the horizontal direction is 10° to 20°. In this embodiment, the angle is selected to be 20°. A conveying chamber 3 for conveying slag is arranged inside the conveying cylinder 2, a feed port 4 is provided at the higher end of the conveying cylinder 2, and a discharge port 5 is provided at the lower end of the conveying cylinder 2. A rotating shaft 6 is installed inside the conveying chamber 3 to rotate coaxially with the conveying cylinder 2, and a spiral conveying blade 7 is arranged on the rotating shaft 6. Four scrapers 18 are fixedly installed between each pitch of the spiral conveying blade 7, and the scrapers 18 are all located at the edge of the conveying blade 7. Inclined guide slopes 19 are arranged on the left and right sides of the scrapers 18. Four paddles 20 are arranged between each pitch of the conveying blade 7, and the four paddles 20 correspond to the four scrapers 18 one by one, and the paddles 20 are located between the scrapers 18 and the rotating shaft 6. A round roller 31 is rotatably arranged on one side of the paddle 20 facing the scraper 18, and a flattening gap 21 is arranged between the round roller 31 on the paddle 20 and the scraper 18. A driving assembly 8 for driving the rotating shaft 6 to rotate is also arranged on the conveying cylinder 2. The driving assembly 8 is a motor, and the motor drives the rotating shaft 6 to rotate through a belt. The rotating speed of the rotating shaft 6 is 30r / min.

[0044] refer to Figure 3 , Figure 5 , Figure 7 and Figure 8 A heat exchange component for recovering the waste heat of the slag is also provided on the conveying cylinder 2. The heat exchange component includes a liquid heat exchange chamber 9 for transferring the heat exchange liquid. The liquid heat exchange chamber 9 is coaxially covered on the outside of the conveying chamber 3. A water inlet 10 and a water outlet 11 are respectively provided on the liquid heat exchange chamber 9. The water inlet 10 is arranged at the higher end of the liquid heat exchange chamber 9, and the water inlet 10 is located at the lower side of the end; the water outlet 11 is arranged at the lower end of the liquid heat exchange chamber 9, and the water outlet 11 is located at the upper side of the end.

[0045] refer to Figure 3 , Figure 5 , Figure 7 and Figure 8The heat exchange assembly also includes an air pump 12 for blowing air into the conveying cavity 3. The air pump 12 is arranged on the lower end of the conveying cylinder 2. A gas heat exchange cavity 13 is also arranged outside the liquid heat exchange cavity 9. The gas heat exchange cavity 13 coaxially covers the outside of the liquid heat exchange cavity 9. A plurality of annular first baffles 22 are fixedly installed on the inner wall of the gas heat exchange cavity 13 close to the liquid heat exchange cavity 9. The first baffles 22 do not contact the inner wall of the gas heat exchange cavity 13 away from the liquid heat exchange cavity 9. A plurality of annular second baffles 23 are fixedly installed on the inner wall of the gas heat exchange cavity 13 away from the liquid heat exchange cavity 9. The second baffles 23 do not contact the inner wall of the gas heat exchange cavity 13 close to the liquid heat exchange cavity 9. The plurality of first baffles 22 and the plurality of second baffles 23 are staggered. A vent pipe 14 is arranged on the conveying cylinder 2. The vent pipe 14 connects the gas heat exchange cavity 13 and the conveying cavity 3. The vent pipe 14 is located directly above the conveying cylinder 2 near the feed port 4. A filter screen 28 is provided inside the vent pipe 14, and a convex ring 29 is provided on the side of the filter screen 28 facing the delivery chamber 3. A second spring 30 is also provided inside the vent pipe 14, and the convex ring 29 is used to keep the convex ring 29 extending from the vent pipe 14 into the delivery chamber 3. An exhaust hole 15 for exhausting the gas inside the gas heat exchange chamber 13 is also provided at the lower end of the gas heat exchange chamber 13.

[0046] refer to Figure 5 and Figure 7 A door plate 16 for closing the feed port 4 is provided at the feed port 4. The door plate 16 is rotatably provided in the conveying chamber 3, and the door plate 16 opens toward the conveying chamber 3. A torsion spring 17 is provided at the rotating shaft 6 of the door plate 16, and the torsion spring 17 is used to keep pushing the door plate 16 toward the feed port 4 to close the feed port 4.

[0047] refer to Figure 7 and Figure 8 , a classification port 24 is also provided on the lower side of the conveying cylinder 2, and the classification port 24 is located on the side of the conveying cylinder 2 close to the feed port 4. And the position of the classification port 24 is 45° from the bottom of the conveying pipe, and the angle deviation between the diameter of the vertical direction of the conveying cylinder 2 is 45°. A classification box 25 is also fixedly installed on the outside of the conveying cylinder 2, and the classification box 25 is connected to the conveying cavity 3 through the classification port 24. A sealing plate 26 is also rotatably provided at the classification port 24, and a first spring 27 is provided in the classification box 25. The first spring 27 is used to keep the sealing plate 26 pushed toward the classification port 24 to close the classification port 24.

[0048] The heat exchange liquid is tap water. Before use, the heat exchange liquid is continuously delivered from the water inlet 10 into the liquid heat exchange chamber 9 to fill the liquid heat exchange chamber 9. The water outlet 11 can be connected to other collection devices to collect water, or directly connected to other pipeline network systems to provide hot water. The air pump 12 is turned on to blow air continuously into the delivery chamber 3.

[0049] When using, refer to Figures 1 to 10 , pour the slag from the feed port 4 into the conveying tube 2. Before the slag enters the conveying tube 2, it will hit and push open the door panel 16 under the action of gravity. The door panel 16 opens toward the inside of the conveying tube 2. When the slag enters the conveying tube 2, the torsion spring 17 drives the door panel 16 to close the feed port 4. After the slag enters the inside of the conveying tube 2, it contacts the bottom of the conveying tube 2. The slag transfers heat to the conveying tube 2. The conveying tube 2 transfers the heat of the slag to the heat exchange liquid in the liquid heat exchange chamber 9. The heat exchange liquid absorbs the residual heat of the slag and stores it. Then the slag rolls into the conveying tube 2 and contacts the conveying blades 7. The conveying blades 7 rotate slowly under the drive of the driving assembly 8. The slag slides down continuously under its own gravity, sticking to the conveying blades 7, and in the process of sliding, it always sticks to the bottom of the conveying tube 2 to transfer heat to the conveying tube 2. The heat exchange liquid also continuously absorbs the residual heat of the slag. When the slag slides downward and enters the first pitch on the conveying blade 7, the scraper 18 of the conveying blade 7 will scrape the bottom of the slag during the rotation process to prevent the slag from adhering to the bottom of the conveying tube 2. When the slag is scraped at the bottom by the scraper 18, the slag, under the action of inertia, climbs over the scraper 18 along the guide slope 19 on the scraper 18 and passes through the flattening gap 21. At this time, if the height of the slag is higher than the height of the flattening gap 21, the part above the flattening gap 21 will be flattened by the paddle 20, so that the slag passes through the flattening gap 21 evenly and is spread on the bottom of the conveying tube 2 with a uniform thickness.

[0050] When there are large pieces of slag, refer to Figure 5 and Figure 8 When the height of large pieces of slag is higher than the height of the flattening gap 21, these large pieces of slag cannot pass through the flattening gap 21 and will be driven by the paddle 20 and the scraper 18 to rotate along with the rotating shaft 6. When the paddle 20 drives these large pieces of slag to pass through the classification port 24, these large pieces of slag will squeeze the sealing plate 26 at the classification port 24 under their own gravity. After the first spring 27 is compressed, the sealing plate 26 opens the classification port 24, and the large pieces of slag fall into the classification box 25. Then the sealing plate 26 closes the classification port 24 again under the action of the first spring 27.

[0051] In this way, the slag continuously slides toward the discharge port 5 and continuously passes through the flattening gap 21. During this process, the residual heat of the slag is continuously recovered, and finally reaches the discharge port 5 and slides out from the discharge port 5. It is only necessary to set a collecting device at the discharge port 5 to collect the cooled slag.

[0052] In the process of the slag moving toward the discharge port 5 in the conveying tube 2, refer to Figure 2 , Figure 3 as well as Figure 5 , Figure 6 and Figure 7 The air pumped into the conveying cylinder 2 by the air pump 12 also continuously absorbs the heat emitted by the slag. After absorbing the heat emitted by the slag, the air enters the gas heat exchange chamber 13 through the filter screen 28 at the ventilation pipe 14 on the upper side of the conveying cylinder 2. The air transfers the temperature to the first baffle 22, the second baffle 23 and the inner wall of the gas heat exchange chamber 13. The first baffle 22, the second baffle 23 and the inner wall of the gas heat exchange chamber 13 transfer the heat to the heat exchange liquid in the liquid heat exchange chamber 9 for storage. Finally, the air in the gas heat exchange chamber 13 will be discharged from the gas heat exchange chamber 13 through the gas outlet. The gas outlet can be connected to a purification pool to prevent the harmful substances emitted by the slag from polluting the air.

[0053] In addition, reference Figure 6 When the scraper 18 passes through the vent pipe 14, the scraper 18 squeezes the convex ring 29, pressing the convex ring 29 and the filter 28 toward the inside of the vent pipe 14. When the scraper 18 leaves the vent pipe 14, the second spring 30 pushes the convex ring 29 and the filter 28 toward the conveying chamber 3. In this way, the filter 28 can be vibrated by the elastic force of the second spring 30, and the dust accumulated on the filter 28 can be shaken off to avoid clogging of the filter 28.

[0054] When the equipment is stopped from being used, water is stopped from entering the water inlet 10, the air pump 12 and the driving device are stopped, and the slag in the classification box 25 is cleaned up quickly.

[0055] A specific embodiment of the present invention is described in detail above in conjunction with the accompanying drawings, but the present invention is not limited to the above described embodiment. For those skilled in the art, various changes, modifications, substitutions and variations of these embodiments without departing from the principles and ideas of the present invention should still fall within the scope of protection of the present invention.

Claims

1. A waste heat resource recovery system for steelmaking slag, comprising a base (1) and a circular conveying cylinder (2), characterized in that: The conveying cylinder (2) is fixedly installed on the base (1) at an angle, a conveying chamber (3) for conveying slag is arranged inside the conveying cylinder (2), a feed port (4) is provided at the higher end of the conveying cylinder (2), a discharge port (5) is provided at the lower end of the conveying cylinder (2), a rotating shaft (6) is coaxially installed with the conveying cylinder (2) inside the conveying chamber (3), a spiral conveying blade (7) is arranged on the rotating shaft (6), and a conveying cylinder (2) is provided with a gear for driving the rotating shaft (6) to rotate. The conveying cylinder (2) is provided with a heat exchange component for recovering the residual heat of the slag, the heat exchange component comprising a liquid heat exchange chamber (9) for transferring the heat exchange liquid, the liquid heat exchange chamber (9) is coaxially coated on the outside of the conveying chamber (3), and the liquid heat exchange chamber (9) is provided with a water inlet (10) and a water outlet (11), the water inlet (10) is arranged at a higher end of the liquid heat exchange chamber (9), and the water outlet (11) is arranged at a lower end of the liquid heat exchange chamber (9).

2. A waste heat resource recovery system for steelmaking slag according to claim 1, characterized in that: The heat exchange component further comprises an air pump (12) for blowing air into the conveying chamber (3), the air pump (12) being arranged on the lower end of the conveying cylinder (2), a gas heat exchange chamber (13) being arranged outside the liquid heat exchange chamber (9), the gas heat exchange chamber (13) being coaxially wrapped around the outside of the liquid heat exchange chamber (9), a vent pipe (14) being arranged on the conveying cylinder (2), the vent pipe (14) connecting the gas heat exchange chamber (13) and the conveying chamber (3), the vent pipe (14) being located directly above the conveying cylinder (2) near the feed port (4), an exhaust hole (15) being arranged at the lower end of the gas heat exchange chamber (13) for discharging gas inside the gas heat exchange chamber (13), and a door plate (16) being arranged at the feed port (4) for closing the feed port (4).

3. A waste heat resource recovery system for steelmaking slag according to claim 2, characterized in that: The door panel (16) is rotatably disposed in the conveying chamber (3), and the door panel (16) is opened toward the conveying chamber (3). A torsion spring (17) is disposed at the rotating shaft (6) of the door panel (16), and the torsion spring (17) is used to keep the door panel (16) pushed toward the feed port (4) to close the feed port (4).

4. The waste heat resource recovery system of steelmaking slag according to claim 2 is characterized in that: A plurality of scrapers (18) are fixedly installed between each pitch of the spiral conveying blade (7), the scrapers (18) are all located at the edge of the conveying blade (7), and inclined guide slopes (19) are provided on the left and right sides of the scrapers (18).

5. The waste heat resource recovery system of steelmaking slag according to claim 4, characterized in that: A plurality of paddles (20) are provided between each pitch of the conveying blades (7), the plurality of paddles (20) correspond one-to-one to the plurality of scrapers (18), the paddles (20) are located between the scrapers (18) and the rotating shaft (6), and a flattening gap (21) is provided between the paddles (20) and the scrapers (18).

6. The waste heat resource recovery system of steelmaking slag according to claim 4, characterized in that: A plurality of annular first baffles (22) are fixedly mounted on the inner wall of the gas heat exchange chamber (13) close to the liquid heat exchange chamber (9), and none of the first baffles (22) contacts the inner wall of the gas heat exchange chamber (13) away from the liquid heat exchange chamber (9); a plurality of annular second baffles (23) are fixedly mounted on the inner wall of the gas heat exchange chamber (13) away from the liquid heat exchange chamber (9), and none of the second baffles (23) contacts the inner wall of the gas heat exchange chamber (13) close to the liquid heat exchange chamber (9); and the plurality of first baffles (22) and the plurality of second baffles (23) are alternately arranged.

7. The waste heat resource recovery system of steelmaking slag according to claim 5, characterized in that: A classification port (24) is also provided on the lower side of the conveying cylinder (2), and a classification box (25) is also fixedly installed on the outside of the conveying cylinder (2), and the classification box (25) is communicated with the conveying chamber (3) through the classification port (24). A sealing plate (26) is also rotatably provided at the classification port (24), and a first spring (27) is provided in the classification box (25), and the first spring (27) is used to keep the sealing plate (26) pushed toward the classification port (24) to close the classification port (24).

8. The waste heat resource recovery system of steelmaking slag according to claim 6, characterized in that: A filter screen (28) is arranged inside the ventilation pipe (14), and a convex ring (29) is arranged on a surface of the filter screen (28) facing the conveying chamber (3). A second spring (30) is also arranged inside the ventilation pipe (14), and the convex ring (29) is used to keep the convex ring (29) extending from the ventilation pipe (14) into the conveying chamber (3).

9. The waste heat resource recovery system of steelmaking slag according to claim 5, characterized in that: A round roller (31) is rotatably arranged on one side of the paddle (20) facing the scraper (18).

10. The waste heat resource recovery system of steelmaking slag according to claim 1, characterized in that: The angle between the inclined conveying cylinder (2) and the horizontal direction is 10° to 20°.

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