High-temperature liquid slag waste heat recovery device and use method

Abstract

The invention relates to the technical field of high-temperature liquid slag waste heat recovery, and discloses a high-temperature liquid slag waste heat recovery device and a using method, the high-temperature liquid slag waste heat recovery device comprises a slag buffer and flow control device, a slag heat exchange device and a discharging device; the slag heat exchange device is provided with a cavity, and a material leveling device, a cooling buried pipe and an air distribution plate are sequentially arranged in the cavity. The air distribution plate is arranged at the lower part of the slag heat exchange device; the leveling device and the cooling buried pipe are arranged in a cavity of the slag heat exchange device; the material flattening device is provided with a hollow structure, and the interior of the hollow structure communicates with the exterior of the slag heat exchange device so that heat exchange can be achieved through a cooling medium. And an inlet of the discharging device is communicated with a bottom outlet of the slag heat exchange device. The problems of temperature fluctuation caused by intermittent slag tapping of the blast furnace and mismatching between granulation and waste heat recovery are solved through a liquid slag buffering and flow control device; the heat exchange efficiency of the molten slag is improved through the heat exchange device and the material leveling device, smooth discharging is guaranteed, and anti-melting and slag particle stacking are reduced.

Description

Technical Field

[0001] The present invention relates to the technical field of waste heat recovery of high-temperature liquid slag, and in particular to a waste heat recovery device of high-temperature liquid slag and a use method thereof. Background Art

[0003] At present, blast furnace slag is mostly treated by water quenching and dry granulation. The water consumption of the water quenching method is very alarming. Each ton of water slag needs to consume 0.8 to 1.2 tons of new water, and the circulating water consumption is about 10 tons. This not only wastes a lot of water resources, but also may pollute the environment. In addition, the water quenching method fails to recover the waste heat of blast furnace slag, resulting in heat waste. Although different water quenching methods have differences in process flow, they all have common shortcomings: they fail to effectively recover the waste heat resources in the slag, waste a lot of water resources, cause air pollution, and consume additional energy. Compared with the water quenching method, the dry granulation method has the advantages of not consuming water resources, less pollutant emissions, and efficient recovery of waste heat; the dry granulation method is widely favored due to its low system energy consumption, small and uniform particle size, and high product added value.

[0004] The dry granulation method may face technical challenges in the early stages, such as low heat recovery efficiency and high energy consumption. In addition, the blast furnace slag formed by the dry granulation method is large in size and low in glass content, which may limit its resource utilization in certain fields. In the dry centrifugal granulation and waste heat recovery devices, a granulation bin and a transmission moving bed are often used in combination for heat exchange, with air as the main heat exchange medium. There is a mismatch between the blast furnace slag discharge and the operating conditions of the waste heat recovery device, slow slag particle cooling rate, low glass conversion rate, high-temperature particle accumulation and remelting, and low heat recovery efficiency. Moreover, the operation and maintenance costs of the granulation bin and the transmission moving bed are high.

[0005] At present, these treatment methods can no longer meet the urgent needs of energy conservation and emission reduction in the current steel industry. Therefore, a new high-temperature liquid slag waste heat recovery device is urgently needed. Summary of the invention

[0006] In order to solve the existing problems, the present invention provides a high-temperature liquid slag waste heat recovery device and a method of use that are reasonably designed, practical and convenient, aiming to break through the technical bottleneck of slag flow, temperature fluctuations caused by intermittent slag discharge from the blast furnace and the mismatch between granulation and waste heat recovery processes, thereby ensuring the stable operation of the centrifugal granulation system.

[0007] In order to achieve the above object, the present invention provides the following technical solutions.

[0008] A high-temperature liquid slag waste heat recovery device, comprising a slag buffer and flow control device, a slag heat exchange device and a discharge device; the slag heat exchange device is provided with a cavity, and the cavity includes a flat material device, a cooling buried pipe and an air distribution plate in sequence; the air distribution plate is arranged at the lower part of the slag heat exchange device; the flat material device and the cooling buried pipe are arranged inside the cavity of the slag heat exchange device; the flat material device is provided with a hollow structure, and the interior of the hollow structure is connected with the outside of the slag heat exchange device to exchange heat through a cooling medium; the inlet of the discharge device is connected with the bottom outlet of the slag heat exchange device.

[0009] As a further improvement of the present invention, the flattening device adopts a steel frame, and the steel frame forms a slope from the center to both sides.

[0010] As a further improvement of the present invention, rake nails are arranged on the flat material device.

[0011] As a further improvement of the present invention, the flattening device is movably connected to the slag heat exchange device.

[0012] As a further improvement of the present invention, the slag buffer and flow control device includes a stopper rod operating port, a stopper rod, a radar level meter and a slag dropping pipe; a radar level meter and a stopper rod operating port are arranged above the slag buffer and flow control device; one end of the stopper rod is arranged in the stopper rod operating port to control the flow rate of the slag by feeding the stopper rod; the slag buffer and flow control device is connected to the slag heat exchange device through a slag dropping pipe.

[0013] As a further improvement of the present invention, the slag buffer and flow control device also includes a weighing sensor; the weighing sensor is arranged at the bottom of the slag buffer and flow control device.

[0014] As a further improvement of the present invention, it also includes a heating surface; the heating surface is a suspended screen heating surface vertically arranged inside the cavity of the slag heat exchange device.

[0015] As a further improvement of the present invention, the heating surface is also arranged on the inner wall of the cavity of the slag heat exchange device.

[0016] As a further improvement of the present invention, the slag buffer and flow control device also includes a side wall wind device; the side wall wind device is arranged on the top of the cavity of the slag heat exchange device.

[0017] On the other hand, the present invention provides a method for using a high-temperature liquid slag waste heat recovery device, comprising the following steps: The high-temperature slag enters the slag buffer and flow control device; The high-temperature slag enters the slag heat exchange device, and the air distribution plate is activated to ventilate and exchange heat to the upper part of the inner cavity; Start the cooling buried pipe to exchange the cooling medium in the lower part of the slag heat exchange device; The high temperature slag falls onto the flat material device and is broken and loosened.

[0018] The present invention has the following beneficial effects: The design of combining the slag buffer and flow control device with the slag heat exchange device of the present invention can effectively recover the waste heat of the high-temperature liquid slag. The slag flow rate is controlled by the slag buffer and flow control device to ensure that the slag enters the slag heat exchange device stably and continuously, thereby improving the efficiency and stability of waste heat recovery; the flattening device can spread the granulated slag produced by the centrifugal granulation cup to the surroundings, so that the granulated slag can slide to the bottom of the inner cavity; the cooling buried pipe can form a cold source at the bottom of the inner cavity, and the slag heat exchange device can be effectively heat-exchanged by the cooling medium; the flattening device is provided with a hollow structure, the interior of the hollow structure is connected to the outside of the slag heat exchange device, the granulated slag formed in the early stage is broken and loose, and the slag is further cooled and hardened by heat exchange with the cooling medium to avoid anti-melting adhesion and slag accumulation; the discharge device can discharge the slag after heat exchange in time to avoid its accumulation in the slag heat exchange device, and keep the heat exchange device unobstructed and efficient operation; the discharge device can realize the cooling and recovery of the slag, which is conducive to resource recycling.

[0019] Preferably, the steel frame has high structural strength and can withstand the weight of the slag and high temperature environment, ensuring the stability and durability of the flat material device during long-term operation; the steel frame forms a slope from the center to both sides, which facilitates the natural sliding and rolling of the granulated slag, increases the relative movement and heat exchange between the slag and the air, and effectively prevents anti-melting adhesion and slag accumulation.

[0020] Preferably, the rake nails can enhance the stirring and uniform distribution effect of the flat material device on the slag, prevent the slag from accumulating or forming dead corners during the heat exchange process, and improve the heat exchange efficiency; the rake nails can be enabled in the event of overheating or adhesion, enhance the discharge effect of the flat material device, and increase the heat dissipation rate.

[0021] Preferably, the movable connection facilitates the maintenance and replacement of the flat material device, and can also adjust the position and angle of the flat material device according to actual needs to adapt to the slag waste heat recovery requirements under different working conditions; the movable connection can also be connected to the vibration device to perform low-amplitude translation or rotational swing of the flat material device.

[0022] Preferably, the stopper rod operating port, stopper rod, radar level meter and slag drop pipe, these components together realize the precise control of slag flow, ensure that slag can enter the slag heat exchange device as needed, and avoid the reduction of heat exchange efficiency caused by excessive or insufficient slag. The radar level meter can record the liquid level change during slag buffering in real time, and the weighing sensor can record the weight change during slag outflow in real time, so as to realize the real-time monitoring of the dynamic outflow and static buffering of slag and ensure the safe and stable operation of the system.

[0023] Preferably, the weighing sensor can monitor the weight of the slag in the slag buffer and flow control device in real time, provide accurate data support for controlling the slag flow rate, and further improve the accuracy and stability of waste heat recovery.

[0024] Preferably, the heating surface of the suspended screen can reduce the obstruction and disturbance to the heat exchange of the airflow, utilize the thermal convection of the gas to improve the heat transfer coefficient, and increase the heat exchange contact area, while also being beneficial to the uniform distribution and flow of the slag, further improving the waste heat recovery efficiency.

[0025] Preferably, the inner wall heating surface can increase the heating area between the slag and the cooling medium, improve the heat exchange efficiency, and thus more effectively recover the waste heat of the slag.

[0026] Preferably, the side wall wind device can provide an appropriate amount of cooling air to the inside of the cavity of the slag heat exchange device, thereby enhancing the heat exchange effect between the slag and the cooling medium. It also helps prevent the slag from coking or adhering to the cavity wall, thereby keeping the heated surface clean and efficient. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] The drawings described herein are only for explanation purposes and are not intended to limit the scope of the present invention in any way. In addition, the shapes and proportional dimensions of the components in the drawings are only for illustration purposes to help understand the present invention and are not intended to specifically limit the shapes and proportional dimensions of the components of the present invention. In the drawings: Figure 1 A schematic diagram of a high-temperature liquid slag waste heat recovery device according to an embodiment; Figure 2 It is a schematic diagram of the linear motion of a flat material device of a high-temperature liquid slag waste heat recovery device described in an embodiment; Among them, 1. slag buffer and flow control device; 2. slag heat exchange device; 3. discharge device; 4. stopper rod; 5. radar level gauge; 6. weighing sensor; 7. slag drop pipe; 8. heating surface; 9. leveling device; 10. cooling buried pipe; 11. air distribution plate; 12. side wall wind device; 13. hot air collection flue; 14. medium heat exchange tube; 15. bearing ball. DETAILED DESCRIPTION

[0028] In order to enable those skilled in the art to better understand the technical solutions in the present invention, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work should fall within the scope of protection of the present invention.

[0029] It should be noted that when an element is referred to as being "disposed on" another element, it may be directly on the other element or there may be a central element. When an element is considered to be "connected to" another element, it may be directly connected to the other element or there may be a central element at the same time. The terms "vertical", "horizontal", "left", "right" and similar expressions used herein are for illustrative purposes only and are not intended to be the only embodiment.

[0030] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as those commonly understood by those skilled in the art to which the present invention belongs. The terms used herein in the specification of the present invention are only for the purpose of describing specific embodiments and are not intended to limit the present invention. The term "and / or" used herein includes any and all combinations of one or more of the related listed items.

[0031] Example like Figure 1 As shown, the present invention is a high-temperature liquid slag waste heat recovery device, which is arranged from top to bottom and includes a slag buffer and flow control device 1, a slag heat exchange device 2, and a discharge device 3.

[0032] The slag buffer and flow control device 1 includes a stopper rod 4, a radar level gauge 5, a weighing sensor 6 and a slag drop pipe 7. The slag buffer and flow control device 1 is a round basin structure with an inner cavity. A stopper rod operating port is provided at the upper center of the slag buffer and flow control device 1, and liquid slag enters the inner cavity of the slag buffer and flow control device 1 through the stopper rod operating port. One end of the stopper rod 4 is provided inside the stopper rod operating port, and the feeding of the stopper rod 4 cooperates with the stopper rod operating port to control the liquid slag to enter the inner cavity of the slag buffer and flow control device 1. A radar level gauge 5 is also provided above the liquid slag buffer and flow control device 1, and the radar level gauge 5 is used to measure the liquid level change during the slag buffer in real time, so that the slag buffer amount meets the capacity requirements of the slag buffer and flow control device 1. A weighing sensor 6 is also provided on the right side of the slag drop pipe 7, and the weighing sensor 6 is used to monitor the change in the quality of the slag buffer and flow control device 1 in real time when the slag flows out. After entering the slag buffer and flow control device 1 , the liquid slag enters the slag heat exchange device 2 through the slag dropping pipe 7 .

[0033] Optionally, the stopper rod 4 can also be connected to the slag dropping pipe 7 by an insertion operation, and the feeding of the stopper rod 4 cooperates with the slag dropping pipe 7 to control the liquid slag to enter the slag heat exchange device 2 .

[0034] Optionally, the radar level meter 5 and the weighing sensor 6 can also be linked with the stopper rod 4 to control the feeding of the stopper rod 4, and then control the gap between the stopper rod 4 and the stopper rod operating port or the slag dropping pipe 7, so as to achieve the purpose of controlling the slag flow rate according to the granulation requirements of the subsequent granulation device. The radar level meter 5 and the weighing sensor 6 are linked to control the feeding of the stopper rod 4, and then control the flow rate in real time, ensuring the stability of the flow rate and ensuring that the blast furnace slag discharge matches the operation of the waste heat recovery device.

[0035] The slag heat exchange device 2 includes a heating surface 8, a flat material device 9, a cooling buried pipe 10, an air distribution plate 11 and a side wall wind device 12; the slag heat exchange device 2 is a box structure, which is located below the slag buffer and flow control device 1. The bottom of the slag heat exchange device 2 is horizontally provided with an air distribution plate 11, and the holes on the air distribution plate 11 can supply air; the setting angle of the air distribution plate 11 and the aperture and spacing of the holes can be adjusted according to the air supply demand of the slag heat exchange device 2. The air flow direction of the air distribution plate 11 is opposite to the moving direction of the slag particles, and the temperature difference between the slag and the air from the air distribution plate 11 is increased by countercurrent, thereby effectively enhancing the convective heat transfer effect of the slag and improving the stability of heat transfer. An easy-to-adjust damper or valve can be introduced on the air distribution plate 11 to automatically adjust the side wall air volume according to the flow and temperature of the slag. The air distribution plate 11 itself considers using high temperature resistant and corrosion resistant fans and pipeline materials to improve the reliability and service life of the side wall wind device.

[0036] The cross section of the box of the slag heat exchange device 2 can be gradually increased from the air distribution plate 11 upward to increase the ventilation space and the heating area 8, and then gradually reduced to form a wind resistance cyclone to increase convective heat exchange; the upper part of the air distribution plate 11 is arranged with a cooling buried pipe 10, and the setting direction of the cooling buried pipe 10 is perpendicular to the air supply direction of the air distribution plate 11. The air outlets on the air distribution plate 11 are evenly spaced to achieve uniform heat exchange of the slag, and countercurrent wind is used to increase the convective heat exchange effect of the slag.

[0037] The cooling buried pipe 10 is horizontally arranged in the dense phase area of ​​the flat material device 9 above the air distribution plate 11, and the heat exchange effect is enhanced by different arrangements and expansion of the heating surface 8. The arrangement includes but is not limited to mesh arrangement, square staggered arrangement, and concentric circle arrangement; the heating surface 8 can be provided with fins, and the fin form includes but is not limited to annular fins, tube fins, spiral fins, and corrugated fins. The heating surface 8 is arranged in the high-temperature particle heat exchange area of ​​the slag heat exchange device 2, including but not limited to the cavity top heating surface 8, the suspended screen heating surface 8, and the flat material device heating surface 8, so that the high-temperature slag can be fully heat exchanged in the entire space, while ensuring that the wall temperature is not too high, reducing external heat dissipation losses.

[0038] The cooling buried pipe 10 is horizontally arranged at the lower part of the dense phase area of ​​the flat material device 9, and adopts a staggered arrangement and an expanded heating surface 8 so that the slag particles can be fully and evenly heat exchanged when passing through the flat material device 9. The cooling water in the cooling buried pipe 10 circulates inside and outside the slag heat exchange device 2 to achieve cooling of the slag particles and waste heat recovery of the slag heat exchange device 2. The process and flow rate of the cooling buried pipe 10 can also be adjusted according to the heat exchange rate requirements.

[0039] like Figure 2 As shown, a flat material device 9 is arranged above the cooling buried pipe 10. The flat material device 9 adopts a steel frame structure, with a trapezoidal shape on the outside, a high middle and low sides, and a hollow design on the inside. The steel frame adopts heat-resistant steel columns. The gap of the steel frame is sufficient to allow the granulated slag to adhere to form irregular solid slag, but the gap is small to avoid leakage and falling. The flat material device 9 is provided with a hollow structure, the interior of which is connected to the outside of the slag heat exchange device 2, and the granulated slag formed in the early stage is broken and loose, and the slag is further cooled and hardened by heat exchange with a cooling medium to avoid anti-melting adhesion and slag accumulation. The contact of the steel frame allows the slag to exchange heat with the steel frame to further reduce the temperature. The cooling medium is introduced into the hollow interior of the flat material device 9, and the thermal stress of the steel frame is reduced through the circulation of the medium, the thermal protection of the device is enhanced, and the heat exchange of the slag is increased. The cooling medium includes but is not limited to the use of air, water and heat transfer oil.

[0040] The cooling medium is introduced into the cavity inside the flat material device 9 through the medium heat exchange pipe 14. The medium heat exchange pipe 14 performs the linear or rotational motion relative to the slag heat exchange device 2 through the bearing ball 15. The structure and principle diagram thereof are shown in FIG. Figure 2 .

[0041] The flattening device 9 is hydraulically driven, and with the aid of the bearing balls 15, the flattening device 9 can achieve linear or rotational motion, thereby ensuring that the flattening device 9 has a sufficiently large output force and range of action.

[0042] Optionally, the driving form of the flat material device 9 also includes but is not limited to pneumatic and electric to achieve linear or rotary motion of the flat material device 9. Generally, a smaller granulation demand corresponds to a smaller flat material device 9, which is suitable for electric; a larger granulation demand corresponds to a larger flat material device 9, which is suitable for pneumatic or hydraulic.

[0043] The flat material device 9 may also be a steel plate structure, with the cooling buried pipe 10 disposed inside, so that the flat material device 9 is circulated and heat exchanged by a cooling medium.

[0044] Optionally, a rake nail can be added to the upper part of the flattening device 9 to enhance the loosening ability of the slag particles, enhance the waste heat recovery effect, and effectively prevent the slag particles from sticking and accumulating. The rake nails can be symmetrically arranged on both sides of the granulating cup to break and loosen the slag formed by the granulation, which is large in volume and cannot slide down naturally.

[0045] Optionally, a roller crushing device may be added to the upper part of the flattening device 9. The roller crushing devices are symmetrically arranged on both sides of the granulating rotor, and the roller crushing devices are provided with a plurality of pairs of air-cooled roller crushing devices, both ends of which are connected to the slag heat exchange device 2, and the rotation direction of each pair of air-cooled roller crushing devices is different; the air-cooled roller crushing device is used to cut off the slag blocks or slag cotton balls with larger particle sizes, and the slag blocks or slag cotton balls with larger particle sizes are crushed by the air-cooled roller crushing device to form small slag blocks, and the small slag blocks continue to exchange heat in the slag heat exchange device 2.

[0046] The slag heat exchange device 2 is provided with a heating surface 8 inside and on the wall to effectively enhance the heat exchange intensity and prevent the wall temperature from being too high; a suspended screen heating surface 8 is provided inside the slag heat exchange device 2 to enhance the heat exchange efficiency and prevent the high-temperature slag from remelting. The cavity of the slag heat exchange device 2 can be made of heat-resistant and highly conductive materials, such as heat-resistant steel and carbon steel; the inner wall also serves as the heating surface 8 to absorb the convection heat exchange of the air in the cavity and the heat radiation of the heating surface 8 in the cavity.

[0047] Optionally, finned tubes, nail head tubes, sprayed tubes or special-shaped tubes may be arranged inside the slag heat exchange device 2 to further promote the heat exchange of the slag particles and disperse the slag particles for uniform heat exchange.

[0048] Above the inner side wall of the slag heat exchanger 2, the side wall wind device 12 is evenly arranged in the circumferential direction, and an airflow is introduced into the upper part of the slag heat exchanger 2, so as to directly exchange air with the slag falling pipe 7 and the heating surface 8. The airflow blown upward by the air distribution plate 11 passes through the cooling buried pipe 10 and the material leveling device 9, and is divided along the side wall to enter the upper space of the slag heat exchanger 2, forming an airflow from bottom to top, which meets and mixes with the side wall wind airflow blown in from the upper part. The mixed air cyclone produces a thermal convection effect, which makes the heat exchange efficiency higher. The incident angle and flow rate of the side wall wind can be adjusted in real time according to the slag flow rate, temperature and rotor speed to ensure the best granulation effect and increase the heat exchange efficiency. When a uniform cooling effect on the slag particles is required, the side wall wind with the same direction and wind speed can be used. When it is necessary to strengthen the thermal protection of the wall surface, different side wall wind devices 12 can be adjusted to make the incident angle and speed of the side wall wind different, thereby strengthening the spatial turbulence and protecting the wall surface of the slag heat exchanger 2.

[0049] A hot air collecting flue 13 is arranged on the top of the slag heat exchange device 2. Two streams of air are blown into the inner cavity of the slag heat exchange device 2 by the air distribution plate 11 and the side wall wind device 12. After heat exchange and temperature increase, the two streams of air float upward and are discharged from the hot air collecting flue 13. Heat is recovered through the waste heat boiler and then discharged into the atmosphere by the dust removal device or merged into the air inlet of the air distribution plate 11 or the side wall wind device 12.

[0050] The recovered hot air can be introduced into the waste heat boiler, and a primary dust collector is installed in the inlet section of the pipeline to ensure the safe operation of the waste heat boiler; A discharge device 3 is provided below the slag heat exchange device 2, and the inlet section of the discharge device 3 is connected to the outlet end of the slag heat exchange device 2. The outlet end of the slag heat exchange device 2 is lower than the air outlet of the air distribution plate 11, thereby preventing the air outlet from hindering the slag discharge and the slag stacking from causing the particles to melt and adhere. The discharge device 3 itself is made of wear-resistant and high-temperature resistant materials to improve its service life and reliability.

[0051] The discharge device 3 adopts a water-cooled spiral slag cooler or a drum slag cooler, and the cooling medium includes but is not limited to air cooling, water cooling and wind and water combined cooling. The slag cooler includes but is not limited to the use of water-cooled sleeves, internal ventilation, additional baffles and internal multi-area division to enhance the heat exchange efficiency. When using a water-cooled spiral slag cooler or a drum slag cooler for discharge, the slag discharge capacity can be automatically adjusted according to the slag discharge amount. At the same time, a water-cooled jacket, internal ventilation and internal baffles are used to enhance the heat exchange of slag particles.

[0052] In summary, the present invention integrates the slag buffer and flow control device 1, the enhanced heat exchange device and the discharge device 3 to achieve high-temperature slag flow control and sufficient cooling, enhance the waste heat recovery effect, and effectively prevent the accumulation and remelting of high-temperature slag particles, thereby achieving safe and stable operation of the system.

[0053] A method for using a high-temperature liquid slag waste heat recovery device in this embodiment is as follows: The high-temperature molten slag enters the liquid slag buffer and flow control device 1, and the slag liquid level is confirmed by the radar level meter 5 to meet the buffer quantity requirement. At the same time, the stopper rod 4 is fed through the linkage control of the weighing sensor 6 to ensure that the slag outflow meets the requirements of the granulation device, thereby realizing the seamless connection between the smelting furnace and the granulation device.

[0054] After the high-temperature molten slag enters the slag heat exchange device 2, it performs radiation heat exchange with the top heating surface 8 and the side wall wind device 12 of the slag heat exchange device 2, the suspended screen heating surface 8, the cooling buried pipe 10 and the heating surface 8 of the discharge device 3 in turn, so that the high-temperature liquid slag changes from a molten state to a solid state. The higher heat exchange rate can effectively increase the content of glass in the slag particles.

[0055] At the same time, the high-temperature slag particles undergo convective heat exchange with the air distribution plate 11 and the air from the discharge device 3 in the dense phase buried pipe area of ​​the flat material device 9, the dilute phase area of ​​the suspended screen heating surface 8, the slag heat exchange device 2 and the discharge device 3 respectively. The wind after heat exchange merges with the side wall wind and enters the waste heat boiler to further realize waste heat recovery.

[0056] The discharge device 3 further exchanges heat with the slag particles, while realizing the transportation and transfer of the slag particles, thereby reducing energy consumption.

[0057] The linkage design in the embodiment can introduce advanced programmable logic controller PLC or distributed control system DCS to monitor and control the entire waste heat recovery process. Integrate sensor data such as temperature, pressure, flow, liquid level, etc. for real-time monitoring and feedback control. Realize remote monitoring and fault diagnosis functions to improve system reliability and maintenance efficiency.

[0058] In addition, temperature sensors, pressure sensors and alarm devices are installed at key locations to monitor the system's operating status in real time. Emergency shutdown devices and emergency discharge devices are introduced to deal with possible abnormal situations. Professional training is provided to operators to improve their ability to operate and maintain the system.

[0059] The above embodiment is only one of the implementation methods that can realize the technical solution of the present invention. The scope of protection claimed by the present invention is not limited only to this embodiment, but also includes changes, replacements and other implementation methods that can be easily thought of by any technician familiar with the technical field within the technical scope disclosed by the present invention. Although the embodiments of the present invention have been shown and described, it can be understood by those of ordinary skill in the art that various changes, modifications, replacements and variations can be made to these embodiments without departing from the principles and spirit of the present invention, and the scope of the present invention is defined by the attached claims and their equivalents.

Claims

1. A high-temperature liquid slag waste heat recovery device, characterized in that: The invention comprises a slag buffer and flow control device (1), a slag heat exchange device (2) and a discharge device (3); the slag heat exchange device (2) is provided with a cavity, and the cavity comprises a flat material device (9), a cooling buried pipe (10) and an air distribution plate (11) in sequence; the air distribution plate (11) is arranged at the lower part of the slag heat exchange device (2); the flat material device (9) and the cooling buried pipe (10) are arranged inside the cavity of the slag heat exchange device (2); the flat material device (9) is provided with a hollow structure, and the interior of the hollow structure is connected to the outside of the slag heat exchange device (2) so as to exchange heat through a cooling medium; the inlet of the discharge device (3) is connected to the bottom outlet of the slag heat exchange device (2).

2. A high-temperature liquid slag waste heat recovery device according to claim 1, characterized in that: The flattening device (9) uses a steel frame, and the steel frame forms a slope from the center to both sides.

3. The high-temperature liquid slag waste heat recovery device according to claim 1, characterized in that: The flat material device (9) is provided with rake nails.

4. A high-temperature liquid slag waste heat recovery device according to claim 1, characterized in that: The material leveling device (9) is movably connected to the slag heat exchange device (2).

5. The high-temperature liquid slag waste heat recovery device according to claim 1, characterized in that: The slag buffer and flow control device (1) comprises a stopper rod operating port, a stopper rod (4), a radar level meter and a slag dropping pipe (7); a radar level meter (5) and a stopper rod operating port are arranged above the slag buffer and flow control device (1); one end of the stopper rod (4) is arranged in the stopper rod operating port so as to control the flow of slag by feeding the stopper rod (4); the slag buffer and flow control device (1) is connected to the slag heat exchange device (2) via the slag dropping pipe (7).

6. The high-temperature liquid slag waste heat recovery device according to claim 1, characterized in that: The slag buffer and flow control device (1) further comprises a weighing sensor (6); the weighing sensor (6) is arranged at the bottom of the slag buffer and flow control device (1).

7. The high-temperature liquid slag waste heat recovery device according to claim 1, characterized in that: It also comprises a heating surface (8); the heating surface (8) is a suspended screen heating surface (8) vertically arranged inside the cavity of the slag heat exchange device (2).

8. A high-temperature liquid slag waste heat recovery device according to claim 7, characterized in that: The heating surface (8) is also arranged on the inner wall of the cavity of the slag heat exchange device (2).

9. The high-temperature liquid slag waste heat recovery device according to claim 1, characterized in that: The slag buffering and flow control device (1) further comprises a side wall wind device (12); the side wall wind device (12) is arranged at the top of the cavity of the slag heat exchange device (2).

10. A method for using a high-temperature liquid slag waste heat recovery device according to any one of claims 1 to 9, comprising the following steps: The high-temperature slag enters the slag buffer and flow control device (1); The high-temperature molten slag enters the slag heat exchange device (2), and the air distribution plate (11) is activated to ventilate and exchange heat to the upper part of the inner cavity; Starting the cooling buried pipe (10) to perform cooling medium heat exchange on the middle and lower part of the slag heat exchange device (2); The high-temperature molten slag falls onto the flat material device (9) and is broken and loosened.

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