Slag waste heat recovery process and recovery device

Abstract

The present invention provides a slag waste heat recovery process and device. A slag ladle is placed in a slow-cooling tunnel, where it undergoes slow cooling, perforated heat dissipation, hot air circulation, and rapid water cooling. The water-cooled membrane walls in the slow-cooling tunnel generate hot air self-circulation on both sides of the slag ladle, exchanging and dissipating heat. High-quality steam is continuously generated through a water vapor generator, improving the efficiency of slag ladle waste heat recovery. This invention addresses the need to balance slow cooling, forced cooling, and safe and economical utilization of heat energy. It safely, efficiently, with high quality, and economically recovers the waste heat resources of copper slag without affecting the copper recovery rate of the copper slag beneficiation process, while also improving the turnover efficiency of the slag ladle.

Description

Technical Field

[0001] The present invention relates to the technical field of slag ladle cooling, and in particular to a slag waste heat recovery process and a recovery device. Background Art

[0002] At present, the mature cooling processes used for copper slag in copper smelting process are direct water quenching and strong cooling or slow air cooling of hot slag followed by water spraying and strong cooling; the current mature coking cooling process in the coking industry is the nitrogen dry quenching waste heat recovery system; the current mature intermediate semi-finished product cooling process in the cement industry is the hot air conversion waste heat recovery system; the copper smelting industry is also developing and researching two slag cooling solutions: tunnel kiln hot air heat exchange and hot water heat exchange.

[0003] The copper slag in the copper smelting process is in a molten state. Direct water quenching or air cooling of the slag bag followed by water cooling both use direct water heat exchange methods, which are prone to slag blasting and flash steam diffusion, and have a low safety factor; flash steam is rich in a large amount of air and diffuses rapidly with the surrounding air, affecting the production environment; and it is impossible to recover heat energy efficiently and with high quality.

[0004] The copper slag from the copper smelting industry is rich in copper, iron and other substances, and flotation recovery has great economic value. However, the subsequent flotation process requires the copper slag to be slowly cooled and crystallized, and the copper slag cannot be crushed immediately. In addition, the copper slag has high viscosity and the materials are dispersed. The method of crushing and then heat exchanging is not suitable for the actual comprehensive process requirements of copper slag sensible heat recovery.

[0005] Water is used as the heat exchange medium to directly exchange heat with the outer wall of the slag bag. There are some shortcomings: first, the water contains a lot of impurities, which is not conducive to subsequent recycling and utilization; second, the temperature difference is large and the speed is fast in the early stage of water cooling, which is not conducive to the growth of copper crystal nuclei in the slag, reducing the copper recovery rate in the subsequent mineral processing process; third, the spray cooling water operates at normal pressure, and can only recover low-quality hot water, resulting in low thermal energy utilization.

[0006] The use of air as a heat exchange medium has the following disadvantages: first, the specific heat of air is small, the heat exchange rate is low, the operation time is long, and the heat energy is not concentrated and the release quality is low; second, when forced hot air circulation is used, the self-consumption of electricity is high, which is not economical. Summary of the Invention

[0007] In response to the above problems, the present invention provides a slag waste heat recovery process and recovery device, which solves the problem of taking into account the slow cooling, strong cooling and safe and economical utilization of heat energy of slag; without affecting the copper recovery rate of the copper slag beneficiation process, the waste heat resources of copper slag are recovered safely, efficiently, with high quality and economically, while improving the turnover efficiency of the slag bag.

[0008] In order to solve the above problems, the technical solution adopted by the present invention is:

[0009] A slag waste heat recovery process comprises the following steps:

[0010] S1. Slag ladle slow cooling: Control the slag ladle from the first end into the slow cooling tunnel and allow the slag ladle to slow cool for a predetermined time;

[0011] S2, punching and cooling: After the slag ladle is slowly cooled in step S1, the central sinking rod is controlled to extend downward to achieve a punching action, breaking through the outermost thin slag layer and the middle soft slag layer of the slag. The punching action is repeated several times within a predetermined time;

[0012] S3. Hot air circulation: While the slag bag is being perforated to dissipate heat, hot air is self-circulated on both sides of the slag bag, and the steam generated in the water-cooled membrane wall is collected to achieve heat exchange;

[0013] S4, rapid water cooling: After the hot air circulation in step S3 is completed, the slag ladle is controlled to be moved out of the slow-strong cooling tunnel, and the surface of the slag ladle is drip-cooled with water. The drip irrigation water enters from the center area of ​​the top to achieve efficient and rapid water cooling of the solidified melt in the slag ladle.

[0014] Preferably, in step S2, when the center countersink rod is extended downward to realize the breaking-through action, the center countersink rod is controlled to slightly rotate in a first direction at a predetermined rate, and the slight rotation speed ensures that the center countersink rod can rotate exactly one circle when inserted into the slag in the slag ladle, and just retracts after rotating one circle. This can firstly ensure that the thin slag layer and the soft slag layer on the outer layer of the slag can be completely broken through. Secondly, one rotation can also throw the slag stuck on the countersink rod away from the surface and drop it to the surface of the slag ladle, so as to avoid it sticking to the countersink rod and clogging the pores, thereby extending the service life of the countersink rod.

[0015] Preferably, in the process of extending the central countersink rod to realize the opening action in step S2, 0.6 Mpa compressed air is controlled to flow out from the airflow guide hole, and the airflow first completes the cooling of the countersink rod, and then is injected into the soft slag layer laterally to form a hot air flow channel; preferably, the angle between the axis of the airflow guide hole and the bottom plane is set to 50°~60° to ensure that the airflow can be blown into the soft slag layer in all directions. Under the joint action of pressure and thermal power, the airflow forms fine interconnected honeycomb gaps in the soft slag layer, which is beneficial to the rapid exchange and collection of heat in the slag body around the countersink, and outputs high-energy-density hot air flow from the center of the countersink, thereby reducing the rapid cooling time of the slag bag.

[0016] Preferably, during the movement of the slag bag, the electric self-priming doors on both sides of the slow and strong cooling tunnel are opened to keep the slow and strong cooling tunnel in an open state; during the slow cooling of the slag bag, the electric self-priming doors on both sides of the slow and strong cooling tunnel are closed to keep the slow and strong cooling tunnel in a closed state.

[0017] Preferably, the predetermined time for slow cooling of the slag ladle in step S1 is a multiple of the predetermined time for heat dissipation by punching in step S2, for example: slow cooling for 2 hours and heat dissipation by punching for 4 hours. The specific multiples are adjusted and optimized according to different smelting slag types and different slow cooling processes and scales.

[0018] A slag waste heat recovery device, comprising:

[0019] The slow-strong cooling tunnel has an inner wall provided with a water-cooled membrane wall, and the cross-section of the water-cooled membrane wall is heart-shaped. As a preferred embodiment, the left and right ends of the slag bag are about 500 mm away from the farthest end of the heart-shaped structure, and the distance between the slag bag mouth and the highest point of the top of the heart-shaped structure is 1800 mm to 2000 mm, so as to ensure that the hot air can form an internal circulation in this heart-shaped structure. At the same time, the curvature of the heart shape is determined to ensure that the lowest point of the hot air self-circulation is more than 200 mm higher than the intelligent flatbed trolley, so as to ensure that the position of the flatbed trolley is in a lower temperature area, protect the flatbed trolley, and extend the service life of the flatbed trolley.

[0020] The transport device is arranged at the bottom area of ​​the slow and strong cooling tunnel and is used to transport the slag bag loaded with molten slag in a directional manner.

[0021] The steam generating device is connected to the water-cooled membrane wall up and down. The downcomer of the device supplies boiler water, the upcomer is used to collect the steam-water mixture, and the top outlet of the steam generating device is used to continuously transport steam outward.

[0022] The sinking device is arranged at the top of the middle position of the slow and strong cooling tunnel, and includes a central sinking rod, which moves toward the slag bag through the central sinking rod to break through the solidified slag on the surface of the slag bag and form a channel for concentrated heat release.

[0023] Preferably, the transport device includes a transport trolley for carrying the slag bag and a carrying track for carrying the transport trolley, and electric self-priming doors located outside the transport device are provided on both sides of the slow-strong cooling tunnel.

[0024] Preferably, the central countersink rod includes a central body with a hole and a punching body, the end of the punching body includes a conical slope, the side wall of the central body with a hole at the necking point is provided with an air flow guide hole, the central body with a hole is fixedly connected to the punching body, and the top of the slow and strong cooling tunnel is provided with a first drive device for controlling the directional rotation of the central countersink rod, and the top of the slow and strong cooling tunnel is provided with a second drive device for controlling the up and down directional movement of the central countersink rod.

[0025] Preferably, the axial diameter of the central body with a hole is smaller than the axial diameter of the punching body, and the central body with a hole and the punching body are fixedly connected via a truncated cone-shaped connecting workpiece.

[0026] Preferably, the steam generating device includes a steam drum, the steam drum is connected to the top of the water-cooled membrane wall via an ascending pipe, is connected to the bottom header of the water-cooled membrane wall via a descending pipe, and the top of the steam drum is connected to a steam delivery pipe.

[0027] The beneficial effects of the present invention are:

[0028] 1. Slow cooling of multiple slag bags is carried out through the slow-strong cooling tunnel, which can reduce the cooling rate of the slag bag in the initial stage, promote the growth of copper metal crystals inside the slag, and improve the metal recovery efficiency; in the initial and intermediate stages, hot air self-circulation can be formed on both sides of the slag bag, and rapid heat exchange with the water-cooled membrane wall can be carried out to generate high-quality steam and improve the heat recovery efficiency; and the hot air circulation is automatic, without the need for separate hot air control, reducing production costs and production energy consumption, thereby reducing production costs.

[0029] 2. By setting up a countersink device, the condensed surface slag can be punched during the cooling process of the slag bag, so that the molten slag with a higher internal temperature can fully exchange heat with the surrounding air, realize the concentrated and rapid dissipation of heat, increase the temperature of the air flow inside the slow and strong cooling tunnel, and continuously produce high-quality steam. At the same time, it creates a structural foundation for the subsequent dripping rapid cooling, shortens the cooling time of the slag in the final stage, reduces cooling water consumption, eliminates safety hazards of blasting, and improves the turnover efficiency of the slag bag. In addition, during the drilling process, controlling the micro-rotation of the entire countersink rod can slightly expand the aperture, improve the heat exchange efficiency, and avoid excessive slag sticking to the surface of the countersink rod, ensuring the long-term stable operation of the entire equipment; blowing compressed air from the top can not only cool the rod at the end, but also create a structural channel for accelerated heat dissipation, which is organically combined with the hot air self-circulation to improve the overall efficiency of slag bag heat recovery. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] Figure 1 It is a schematic diagram of the three-dimensional structure of the present invention;

[0031] Figure 2 For the present invention Figure 1 Schematic diagram of the main structure;

[0032] Figure 3 For the present invention Figure 1 A side structural diagram of

[0033] Figure 4 It is a schematic diagram of the three-dimensional structure of the central countersunk rod of the present invention.

[0034] In the figure: 100, slow-cooling tunnel; 200, transportation device; 300, slag bag; 400, water vapor generating device; 410, steam drum; 420, ascending pipe; 430, descending pipe; 440, steam delivery pipe; 500, countersinking device; 510, perforated center body; 511, air flow guide hole; 520, punching body; 521, conical slope; 530, second drive device; 540, compressed air pipeline. Implementation Method

[0035] The present invention will be further described below with reference to the accompanying drawings and examples.

[0036] A slag waste heat recovery process comprises the following steps:

[0037] S1. Slag bag slow cooling: The slag bag is controlled to enter the slow cooling tunnel from the first end and is allowed to slow cool for a predetermined time. At this stage, the slag bag enters the closed tunnel for slow cooling for about 1 to 2 hours. The purpose of slow cooling is to ensure that the copper sulfide and metallic copper crystal particles in the copper slag grow up, so that copper can be selected by flotation in the future.

[0038] S2. Punching for heat dissipation: After the slow cooling of the slag ladle in step S1 is completed, the central sinking rod is controlled to extend downward to achieve a punching action, so as to punch through the outermost thin slag layer and the middle soft slag layer of the slag, and the punching action is repeated several times within a predetermined time. By setting the central sinking rod, the surface of the slag ladle can be continuously punched to punch through the condensed part of the slag surface, which can accelerate the heat dissipation of the slag in the slag ladle and increase the slow cooling rate of the slag ladle to achieve rapid heat dissipation.

[0039] S3. Hot air circulation: While the slag bag is being drilled for heat dissipation, hot air is self-circulating on both sides of the slag bag. At the same time, the steam generated in the water-cooled membrane wall is collected to achieve heat exchange. The water-cooled membrane wall in the slow-strong cooling tunnel is heart-shaped. During this stage, hot air self-circulation will be formed on both sides of the slag bag, further accelerating the dissipation and exchange of heat to generate high-quality steam for heat recovery.

[0040] S4, rapid water cooling: After the hot air circulation in step S3 is completed, the slag ladle is continued to be controlled to be moved out of the slow and strong cooling tunnel, and the slag ladle is drip-cooled with water. The drip water enters from the center area of ​​the top to achieve efficient and rapid water cooling of the solidified melt in the slag ladle; at this stage, the drip cooling water can directly enter the center of the slag to achieve rapid heat dissipation of the slag; the rapid heat dissipation of the slag in the subsequent stage can shorten the overall time required for slow cooling of the slag ladle, improve the turnover rate of the slag ladle, and reduce turnover costs.

[0041] During the process of extending the central countersink rod to achieve the breakthrough in step S2, the central countersink rod is controlled to slightly rotate in the first direction at a predetermined rate; it can improve the dissipation of heat, firstly, break up the dense surface thin slag that hinders heat transfer; secondly, prevent the hollow rod from being excessively bonded, which is convenient for secondary lifting; thirdly, allow the central heat of the molten slag to be concentrated and released quickly, achieving efficient and high-quality heat transfer effects, and it can also slightly expand the countersink diameter, increase the side wall gap between the rod and the slag, protect the cone at the rod head, and reduce the cone burning rate.

[0042] In step S2, when the central countersink rod is extended downward to realize the opening action, the cooling air flow is controlled to flow out from the air flow guide hole. The air flow first cools the countersink rod and then is injected into the soft slag layer laterally to form a hot air flow channel. The cooling air flow can cool the front end of the cooling rod while quickly taking out the heat of the slag around the countersink, so as to shorten the cooling time of the slag bag and improve the heat utilization efficiency.

[0043] During the movement of the slag bag, the electric self-suction doors on both sides of the slow and strong cooling tunnel are opened to keep the slow and strong cooling tunnel in an open state; during the slow cooling of the slag bag, the electric self-suction doors on both sides of the slow and strong cooling tunnel are closed to keep the slow and strong cooling tunnel in a closed state. By setting up the electric self-suction doors, coordinated control can be performed during the movement of the slag bag to ensure the normal transportation of the slag bag; during the slow cooling of the slag bag, closing the electric self-suction doors on both sides can form a relatively isolated chamber in the slow and strong cooling tunnel, reduce heat loss, and improve the efficiency of heat recovery and utilization.

[0044] Reference Figures 1-4 A slag waste heat recovery device includes: a slow-strong cooling tunnel 100, a transportation device 200, a water vapor generating device 400, and a sinking device 500. The transportation device 200 transports the slag bag 300 to the slow-strong cooling tunnel 100 to achieve slow cooling and heat exchange, which can ensure that the copper sulfide and metallic copper crystal particles in the copper slag grow, so that copper can be selected by flotation method later. At the same time, the slag bag 300 can be quickly cooled and dissipated, the heat can be collected and utilized, and the economic benefits can be improved.

[0045] The inner wall of the slow and strong cooling tunnel 100 is provided with a water-cooled membrane wall, and the cross section of the water-cooled membrane wall is heart-shaped (for details, please refer to the attached Figure 3 ), the heart-shaped water-cooled membrane wall can absorb the heat generated by the slag bag, so that the heat can be exchanged quickly; the implementation plan of the heart-shaped structure hot air self-circulation heat exchange system: a heart-shaped water-cooled membrane wall is set on both sides of the track where the slag bag transport trolley passes. The hot air rises, encounters the water-cooled membrane wall for cooling, and then sinks along the two sides. It is guided by the heart-shaped structure and rushes to the side wall of the slag bag at a nearly vertical angle, completing the natural enhanced circulation of hot air.

[0046] The transport device 200 is arranged at the bottom of the slow and strong cooling tunnel 100, and is used to transport the slag bag 300 loaded with molten slag for directional movement; wherein the transport device 200 includes a transport trolley for carrying the slag bag 300 and a bearing track for carrying the transport trolley, and electric self-priming doors are provided on the outside of the transport device 200 on both sides of the slow and strong cooling tunnel 100. The slag bag 300 is placed on the upper end of the transport trolley, which drives the slag bag 300 to move directionally along the predetermined bearing track, thereby realizing directional transportation of the slag bag 300; in order to enhance the melting In order to ensure the safety and heat absorption effect of slag bags operating in confined spaces, the confined space has fully sealed membrane wall structures on both sides, and lightweight electric self-priming doors are designed at both ends; it is necessary to ensure the sealing of the space and facilitate the frequent entry and exit of slag bag cars to meet the transportation needs of 300 slag bags; on the outside of the overall structure, a lifting and transportation system is set up to make full use of the existing flat rail transport trolleys, gantry cranes and slow cooling sites and facilities; the flat rail transport trolleys transport the hot molten slag bags to the slag slow cooling site and enter the heart-shaped structure hot air self-circulation confined space.

[0047] The steam generating device 400 is connected to the water-cooled membrane wall up and down. The downcomer of the device supplies water to the water-cooled membrane wall. The upcomer is used to collect the steam-water mixture. The top outlet of the steam generating device is used to continuously transport steam outward and supplement qualified desalted water to the steam drum according to normal requirements to ensure two-way balance of water vapor.

[0048] The sinking device 500 is arranged at the top of the slow-strong cooling tunnel 100, including a central sinking rod. After the slag bag 300 is slowly cooled in the initial stage of the slow-strong cooling tunnel 100, it moves toward the slag bag 300 through the central sinking rod. The sinking device 500 can punch holes in the slag solidified on the surface of the slag bag 300 to break through the slag solidified on the surface of the slag bag 300, expand the middle softening layer, and accelerate the dissipation of heat; the temperature in the middle position is the highest in this stage, and the two sides of the inner wall of the water-cooled membrane wall of the heart-shaped structure can generate hot air self-circulation, realize automatic circulation exchange of heat, so as to achieve enhanced cooling of the slag bag 300 and efficient utilization of the slag heat, continuously generate high-quality steam, and improve the overall economic benefits.

[0049] It should be noted here that after the slag bag completes slow cooling at the predetermined position, the copper slag in the slag bag will form three layers. The outermost layer is a thin slag layer, the middle layer is a soft slag layer, and the center is a molten layer (red heart part). The central sinking rod extends downward step by step, breaking through the outermost thin slag layer and the soft slag layer of the slag and then rotating out, so that the central molten layer (red heart layer) can be exposed to cool and slag. The central sinking rod extends downward again, and so on, until it reaches a quarter of the height of the bottom of the slag, so that the central molten layer (red heart) continues to move downward and is half exposed to dissipate heat. The whole process lasts about 4 hours.

[0050] In order to ensure the accuracy and parameter controllability of the center countersink of the hollow rod, a transmitter and receiver for automatic laser scanning and positioning should be set between the slag bag and the hollow rod; at the same time, slag bag outer wall temperature sensors are set at the corresponding positions of the membrane walls on both sides of the slag bag to accurately measure and control the temperature changes of the slag bag outer wall, and compare with the temperature database to adjust the depth, duration and frequency of hollow rod insertion in time; the automatic centering positioning and operating depth of the slag bag and countersinking rod are regulated by the self-adaptive system to achieve accurate positioning, and automatically adjust according to the changes in the thickness of the molten slag, continuously enhancing the heat flux density of the central slag heat dissipation.

[0051] Please refer to the attached Figure 4; The central countersunk rod includes a central body 510 with a hole and a punching body 520, the end of the punching body 520 includes a tapered slope 521, the side wall of the central body 510 with a hole is provided with an air flow guide hole 511, the central body 510 with a hole and the punching body 520 are fixedly connected, and the top of the slow and strong cooling tunnel 100 is provided with a first driving device for controlling the directional rotation of the central countersunk rod, the upper end of the central body with a hole is connected to the compressed air pipe 540 through a universal joint and is provided with a first driving device for rotation, and the two are connected by a universal joint to avoid pipe entanglement. The above technology belongs to the public The drilling body and the center body with holes are an integral whole. The top of the slow-strength cooling tunnel 100 is provided with a second driving device 530 for controlling the up and down directional movement of the center countersunk rod. By setting the conical slope 521, the center countersunk rod can be easily inserted into the slag bag 300 to better drill the slag on the surface. In the process of drilling, the first driving device is used to control the rotation of the entire center countersunk rod. During the rotation of the center countersunk rod, on the one hand, the efficiency of drilling can be improved, and on the other hand, excessive slag can be avoided from sticking to ensure the continuous operation of the entire device.

[0052] It should be noted here that the implementation plan of the center countersink enhanced heat exchange system is as follows: after the molten slag bag is kept warm and slowly cooled in a closed space for about 1 to 2 hours, the stepper motor of the micro-rotating countersink hollow rod set just above the slag bag is started. The lower end of the steel hollow rod is a pointed cone. After the hollow rod is accurately positioned, the depth of insertion into the slag is controlled step by step according to the logic set by the program, and micro-rotation is performed. The first function is to break up the thin surface slag that hinders the heat transfer; the second function is to prevent the hollow rod from being too densely bonded, which is convenient for secondary lifting; the third function is to allow the central heat of the molten slag to be concentrated and quickly released to achieve efficient and high-quality heat transfer effects. It can also slightly expand the countersink diameter, increase the side wall gap between the rod and the slag, protect the cone at the rod head, and reduce the cone burn rate. Controlling the rotation of the center countersink rod by the first drive device is a well-known content and will not be repeated here.

[0053] The axial diameter of the perforated center body 510 is smaller than that of the punching body 520. The perforated center body 510 and the punching body 520 are fixedly connected by a truncated cone-shaped connecting workpiece. By setting the above structure, the size of the perforated center body 510 is smaller than that of the punching body 520. The punching body 520 can protect the air flow guide hole 511 on the surface of the perforated center body 510 to prevent foreign matter from blocking the air hole channel; and an air flow duct is provided at the tail end to cool the head of the rod and at the same time inject the soft slag layer from the sides to make the soft slag layer bubble and form honeycomb-shaped gaps, which is conducive to the rapid collection of heat from the slag body around the sinking hole and output from the center of the sinking hole. , forming a high-density hot air flow, reducing the rapid cooling time of the slag bag; the countersink rod is a hollow thickened type, and the material is ordinary hard alloy steel without special requirements. The countersink rod realizes self-cooling through its own surface area and the air convection in the center; it should be added here that there are 6 airflow guide holes 511, which are symmetrically distributed, so that the air blowing of the airflow guide holes is more uniform, which is beneficial to the structural reconstruction of the middle soft slag layer and the vertical and horizontal exchange of heat, that is, it is perpendicular to the slow and strong cooling tunnel 100, and can blow air toward both sides, so that most of the heat is brought into the hot air circulation on both sides, accelerating the heat dissipation and the heat exchange process on the outside.

[0054] Please refer to the attached Figure 3 The steam generating device 400 includes a steam drum 410. The steam drum 410 is connected to the top of the water-cooled membrane wall via an ascending pipe 420, and to both ends of the water-cooled membrane wall via descending pipes 430. The top of the steam drum 410 is connected to a steam delivery pipe 440. The working principle of the self-circulating boiler is as follows: the steam drum 410 separates the steam-water mixture into steam and boiler water. The boiler water enters the bottom header of the water-cooled membrane wall through descending pipes 430 on both sides. The water-cooled membrane wall absorbs heat to produce a steam-water mixture, which automatically rises into the steam drum through ascending pipe 420. The steam in the steam drum is supplied to the outside through steam delivery pipe 440. Qualified make-up water is added to the steam drum 410 via an external desalted water supply pipe. This achieves automatic circulation of the liquid inside the water-cooled membrane wall and continuous, directional discharge of high-quality steam. The entire process is automatic and easy to operate, achieving efficient utilization of the slag bag's heat.

[0055] It should be noted here that the implementation plan of the steam-water self-circulation system is as follows: the steam drum receives the continuous hot water and medium-pressure desalted water from the copper smelting process system to ensure reliable water supply to the steam-water system; the steam drum downcomer 430 is connected to the lower headers of the membrane water-cooled walls at both ends of the enclosed space, and the boiler water naturally absorbs the heat of the hot air and its density decreases. It is then led into the steam drum through the ascending pipe 420 for steam-water separation, and the steam is regulated by the valve group and supplied to the external steam network, thereby realizing the supply, absorption, circulation and external supply of steam and water.

[0056] After the slag ladle with molten slag is countersunk, the center of the slag is cooled by the countersink, significantly reducing the slag temperature. Furthermore, the center of the countersink is insulated by solid slag, eliminating the risk of blasting when drip-cooling the slag. A hole directly connects the center of the molten slag within the ladle, enabling rapid cooling. This effectively reduces the amount of cooling water and significantly shortens the total cooling time of the molten slag.

[0057] Finally, it should be noted that the slow cooling tunnels 100 can be multiple groups and arranged in parallel with each other, for example, three groups according to process requirements to meet the slow cooling process requirements of slag ladles of different production processes and scales.

[0058] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the scope of protection of the present invention.

Claims

1. A slag waste heat recovery device, characterized in that: include: A slow-strong cooling tunnel (100), the inner wall of which is provided with a water-cooled membrane wall, the cross-section of the water-cooled membrane wall being heart-shaped; A transport device (200) is provided at the bottom of the slow-strong cooling tunnel (100) and is used to transport a slag bag (300) loaded with molten slag in a directional manner; A steam generating device (400) is connected to the water-cooled membrane wall up and down and is used to continuously transport steam outward; A sinking device (500) is provided at the top of the middle position of the slow-strength cooling tunnel (100), and includes a central sinking rod, wherein the central sinking rod moves toward the slag bag (300) to break through the solidified slag on the surface of the slag bag (300); The central countersink rod comprises a central body with a hole (510) and a punching body (520), the end of the punching body (520) comprises a tapered slope (521), the side wall of the neck of the central body with a hole (510) is provided with an airflow guide hole (511), the central body with a hole (510) is fixedly connected to the punching body (520), the top of the slow and strong cooling tunnel (100) is provided with a first driving device for controlling the directional rotation of the central countersink rod, and the top of the slow and strong cooling tunnel (100) is provided with a second driving device (530) for controlling the directional movement of the central countersink rod up and down.

2. The slag waste heat recovery device according to claim 1, characterized in that: The transport device (200) comprises a transport trolley for carrying the slag bag (300) and a carrying track for carrying the transport trolley, and electric self-priming doors located outside the transport device (200) are provided on both sides of the slow-strong cooling tunnel (100).

3. The slag waste heat recovery device according to claim 1, characterized in that: The axial diameter of the central body with a hole (510) is smaller than the axial diameter of the punching body (520), and the central body with a hole (510) and the punching body (520) are fixedly connected via a truncated cone-shaped connecting workpiece.

4. The slag waste heat recovery device according to claim 1, characterized in that: The steam generating device (400) comprises a steam drum (410), wherein the steam drum (410) is connected to the top of the water-cooled membrane wall via an ascending pipe (420), is connected to the bottom header of the water-cooled membrane wall via a descending pipe (430), and the top of the steam drum (410) is connected to a steam delivery pipe (440).

5. A slag waste heat recovery process, characterized in that: The slag waste heat recovery device according to any one of claims 1 to 4 comprises the following steps: S1. Slag ladle slow cooling: Control the slag ladle from the first end into the slow cooling tunnel, and allow the slag ladle to slow cool for a predetermined time; S2, punching and cooling: After the slag ladle is slowly cooled in step S1, the central sinking rod is controlled to extend downward to achieve a punching action, breaking through the outermost thin slag layer and the middle soft slag layer of the slag. The punching action is repeated several times within a predetermined time; S3. Hot air circulation: While the slag bag is being perforated to dissipate heat, hot air is self-circulated on both sides of the slag bag, and the steam generated in the water-cooled membrane wall is collected to achieve heat exchange; S4, rapid water cooling: After the hot air circulation in step S3 is completed, the slag ladle is continued to be controlled to move out of the slow-strong cooling tunnel, and the slag ladle is drip-cooled with water. The drip water enters from the top center area to achieve rapid water cooling of the solidified melt in the slag ladle.

6. A slag waste heat recovery process according to claim 5, characterized in that: In step S2, during the process of the central countersink rod extending downward to realize the opening action, the central countersink rod is controlled to slightly rotate in a first direction at a predetermined speed.

7. A slag waste heat recovery process according to claim 5 or 6, characterized in that: In step S2, when the central countersink rod is extended downward to realize the opening action, the cooling air flow is controlled to flow out from the air flow guide hole. The air flow first cools the countersink rod and then injects into the soft slag layer from the sides, making the soft slag layer into a honeycomb shape, quickly forming a hot air flow channel.

8. The slag waste heat recovery process according to claim 5, characterized in that: During the movement of the slag bag, the electric self-priming doors on both sides of the slow and strong cooling tunnel are opened to keep the slow and strong cooling tunnel in an open state; during the slow cooling of the slag bag, the electric self-priming doors on both sides of the slow and strong cooling tunnel are closed to keep the slow and strong cooling tunnel in a closed state.

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