System for recovering heat energy from steelmaking slag
Through the high-temperature and medium-temperature heat exchange system for crushing and smashing steelmaking slag, the high-temperature slag temperature is reduced and converted into electrical energy, which solves the problem of insufficient thermal energy utilization of high-temperature slag in the prior art, and achieves efficient thermal energy conversion.
Patent Information
- Application Number
- CN202422531277.9
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-10-18
- Publication Date
- 2025-08-29
- Estimated Expiration
- 2034-10-18
AI Technical Summary
The prior art cannot efficiently recover heat from steelmaking slag above 500°C, resulting in insufficient utilization of heat energy and low efficiency.
The steelmaking slag is crushed and beaten by a high-temperature heat exchange system and a medium-temperature heat exchange system. The slag temperature is reduced from 1500℃ to 900℃ through a high-temperature heat exchange system, and the medium-temperature heat exchange system is further reduced to 300℃, and the thermal energy is converted into electrical energy in combination with the thermoelectric conversion unit.
It realizes efficient heat extraction and utilization of high-temperature slag, improves heat energy conversion efficiency, and reduces heat loss.
Smart Images
Figure CN223280868U_ABST
Abstract
Description
Technical Field
[0001] The present application relates to the technical field of heat recovery, and in particular to a system for recovering heat energy from steelmaking slag. Background Art
[0002] Existing methods for utilizing slag waste heat include heat extraction from molten iron, slag, pellets, and flue gas. However, these methods generally only recover heat sources with initial temperatures below 500°C, primarily through flue-air convection. They are unable to efficiently and directly extract heat from slag temperatures exceeding 500°C. Furthermore, these methods suffer from uncontrolled heat release and prolonged heat extraction times, leading to heat loss and failure to maximize heat utilization. Summary of the Invention
[0003] In view of this, the technical problem to be solved by this application is to provide a system for recovering heat energy from steelmaking slag, which can more efficiently extract heat from slag at 1500℃-500℃, so as to solve the problem of insufficient heat utilization and low efficiency of high-temperature slag in the existing technology.
[0004] To solve the above problems, in one aspect of the present application, a system for recovering heat energy from steelmaking slag is proposed, comprising:
[0005] a thermoelectric conversion unit, including a boiler and a steam turbine generator, for converting thermal energy into electrical energy;
[0006] Heat energy transmission pipeline, used to transmit the collected hot air to the thermoelectric conversion unit;
[0007] a high-temperature heat exchange system connected to the heat transmission pipeline, configured to obtain high-temperature slag from the steelmaking furnace and reduce its temperature from 1500°C to 900°C; the high-temperature heat exchange system includes a high-temperature resistant heat collection bin, a slag bed, and a slag crushing device; the slag bed and slag crushing device are disposed within the heat collection bin, and the slag crushing device crushes and moves the fluid high-temperature slag, causing it to release heat and form semi-fluid and semi-solid slag; the heat collection bin is also connected to an air intake unit; the air intake unit continuously inputs air into the heat collection bin, and the airflow formed by the air intake transports the heat in the heat collection bin into the heat transmission pipeline; and
[0008] The medium-temperature heat exchange system is connected to the heat energy transmission pipeline; the medium-temperature heat exchange system is configured to receive the slag formed by the high-temperature heat exchange system and further reduce its temperature to 300°C; the medium-temperature heat exchange system includes a rotary kiln, which continuously rotates and beats the slag inside it, so that the slag is further broken and releases heat, and the heat energy in the rotary kiln is transmitted to the heat energy transmission pipeline.
[0009] In another aspect of the present application, a system for recovering heat energy from steelmaking slag is provided, comprising:
[0010] a thermoelectric conversion unit, including a boiler and a steam turbine generator, for converting thermal energy into electrical energy;
[0011] Heat energy transmission pipeline, used to transmit the collected hot air to the thermoelectric conversion unit;
[0012] The high-temperature heat exchange system is connected to the heat energy transmission pipeline. The high-temperature heat exchange system is configured to obtain high-temperature slag from the steelmaking furnace and reduce its temperature from 1500°C to 900°C; the high-temperature heat exchange system includes a high-temperature resistant heat collection bin, a slag bed and a slag breaking device; the slag bed and the slag breaking device are arranged in the heat collection bin, and the slag breaking device crushes and moves the high-temperature slag in a fluid state to release heat and form semi-fluid and semi-solid slag; the heat collection bin is also connected to an air intake unit; the air intake unit continuously inputs air into the heat collection bin, and the airflow formed by the air intake sends the heat in the heat collection bin into the heat energy transmission pipeline.
[0013] The system for recovering heat energy from steelmaking slag provided in the present application crushes and hoists the high-temperature slag arranged in a closed heat collection bin so that the heat in the slag is quickly released, and then the released heat is brought to a thermoelectric conversion unit through an air flow for power generation. Since the heat is released in a concentrated manner during the crushing and hoisting of the slag, the released heat has a high intensity and can be used efficiently by the boiler. In addition, the crushing and heat extraction rate is controllable, which facilitates thermal management. BRIEF DESCRIPTION OF THE DRAWINGS
[0014] Figure 1 FIG2 is a schematic diagram showing the composition of a system for recovering heat energy from steelmaking slag provided by one embodiment of the present application;
[0015] Figure 2 Shown is a diagram of the high-temperature heat exchange system architecture provided by one embodiment of the present application;
[0016] Figure 3 The figure shows a top view of a slag breaking device provided by one embodiment of the present application;
[0017] Figure 4 Shown is a three-dimensional schematic diagram of a slag breaking device provided in one embodiment of the present application. DETAILED DESCRIPTION
[0018] In order to make the technical problems, technical solutions and beneficial effects to be solved by this application clearer and more understandable, this application is further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain this application and are not intended to limit this application.
[0019] Words related to directions in this application, such as up, down, top, bottom, inside, outside, high, and low, are based on the position of the high-temperature heat exchange system or the medium-temperature heat exchange system under normal use.
[0020] In this application, high temperature refers to a slag temperature between 1500-900°C; medium temperature refers to a slag temperature between 900-300°C; and low temperature refers to a slag temperature below 300°C.
[0021] In one aspect of the present application, a system for recovering heat energy from steelmaking slag is provided, comprising:
[0022] a thermoelectric conversion unit, including a boiler and a steam turbine generator, for converting thermal energy into electrical energy;
[0023] Heat energy transmission pipeline, used to transmit the collected hot air to the thermoelectric conversion unit;
[0024] a high-temperature heat exchange system connected to the heat transmission pipeline, configured to obtain high-temperature slag from the steelmaking furnace and reduce its temperature from 1500°C to 900°C; the high-temperature heat exchange system includes a high-temperature resistant heat collection bin, a slag bed, and a slag crushing device; the slag bed and slag crushing device are disposed within the heat collection bin, and the slag crushing device crushes and moves the fluid high-temperature slag, causing it to release heat and form semi-fluid and semi-solid slag; the heat collection bin is also connected to an air intake unit; the air intake unit continuously inputs air into the heat collection bin, and the airflow formed by the air intake transports the heat in the heat collection bin into the heat transmission pipeline; and
[0025] The medium-temperature heat exchange system is connected to the heat energy transmission pipeline; the medium-temperature heat exchange system is configured to receive the slag formed by the high-temperature heat exchange system and further reduce its temperature to 300°C; the medium-temperature heat exchange system includes a rotary kiln, which continuously rotates and beats the slag inside it, so that the slag is further broken and releases heat, and the heat energy in the rotary kiln is transmitted to the heat energy transmission pipeline.
[0026] In at least one embodiment, the slag breaking device is arranged on the slag bed, including a roller, a balance frame, a linear guide rail, a cooling unit, and a first drive unit and a second drive unit; the roller is arranged on the balance frame, the first drive unit drives the balance frame to drive the roller to move back and forth along the linear guide rail, and the second drive unit drives the roller to roll clockwise or counterclockwise to crush the high-temperature slag and push the slag to the target area.
[0027] In at least one embodiment, the outer periphery of the roller shaft is covered with roller teeth, and the roller shaft and the roller teeth are cast from a high-temperature resistant alloy that can withstand 1500°C or above.
[0028] In at least one embodiment, a gear set and a guide wheel are provided on the balancing frame, and the gear set is used to transmit the power of the second drive unit to the roller shaft to rotate it; the guide wheel cooperates with the linear guide rail, and under the drive of the first drive unit, the guide wheel moves along the linear rail.
[0029] In at least one embodiment, the cooling unit continuously sprays and cools the roller, balance frame, gear set, guide wheel and linear guide rail to keep their temperature no higher than 60°C.
[0030] At least one embodiment further includes a low-temperature heat exchange system configured to receive the solid slag received from the rotary kiln, continue to extract residual heat and transfer the extracted heat to the heat energy transmission pipeline and the connected thermoelectric conversion unit.
[0031] In at least one embodiment, it further includes a conveying system, which is arranged between the high-temperature heat exchange system and the medium-temperature heat exchange system, and is used to transport the slag output from the high-temperature heat exchange system to the medium-temperature heat exchange system; the conveying system includes a conveyor belt and a bucket elevator, and the bucket elevator is arranged at the end of the conveyor belt, and is used to pour the slag from the conveyor belt into the rotary kiln.
[0032] In at least one embodiment, the heat energy transmission pipeline includes multiple branch pipelines and a main pipeline, the high-temperature heat exchange system and the medium-temperature heat exchange system are respectively connected to a branch pipeline; the main pipeline is connected to the thermoelectric conversion unit.
[0033] At least one embodiment further includes a heat storage unit, which is disposed between the heat energy transmission pipeline and the thermoelectric conversion unit and is used to store energy that cannot be immediately used by the thermoelectric conversion unit.
[0034] At least one embodiment further includes a dust removal unit, which is arranged at the air flow outlet of the high-temperature heat exchange system and the medium-temperature heat exchange system, and is used to remove dust from the air flow carrying heat to prevent dust from entering the heat energy transmission pipeline.
[0035] In at least one embodiment, the high-temperature heat exchange system and the medium-temperature heat exchange system are each provided with an independent heat collection chamber.
[0036] In at least one embodiment, the thermoelectric conversion unit includes multiple, the heat energy transmission pipeline is connected to the multiple thermoelectric conversion units through multiple branch pipelines, and each branch pipeline is provided with a switch so that the branch pipeline can selectively provide heat energy to the connected thermoelectric conversion unit.
[0037] In another aspect of the present application, a system for recovering heat energy from steelmaking slag is provided, comprising:
[0038] a thermoelectric conversion unit, including a boiler and a steam turbine generator, for converting thermal energy into electrical energy;
[0039] Heat energy transmission pipeline, used to transmit the collected hot air to the thermoelectric conversion unit;
[0040] The high-temperature heat exchange system is connected to the heat energy transmission pipeline. The high-temperature heat exchange system is configured to obtain high-temperature slag from the steelmaking furnace and reduce its temperature from 1500°C to 900°C; the high-temperature heat exchange system includes a high-temperature resistant heat collection bin, a slag bed and a slag breaking device; the slag bed and the slag breaking device are arranged in the heat collection bin, and the slag breaking device crushes and moves the high-temperature slag in a fluid state to release heat and form semi-fluid and semi-solid slag; the heat collection bin is also connected to an air intake unit; the air intake unit continuously inputs air into the heat collection bin, and the airflow formed by the air intake sends the heat in the heat collection bin into the heat energy transmission pipeline.
[0041] In at least one embodiment, the slag breaking device is arranged on the slag bed, including a roller shaft, a balance frame, a linear guide rail, a cooling unit, and a first drive unit and a second drive unit; the outer periphery of the roller shaft is covered with roller teeth, and the roller shaft and the roller teeth are cast from a high-temperature resistant alloy and can withstand 1500°C or above; the roller shaft is arranged on the balance frame, and the first drive unit drives the balance frame to drive the roller shaft to move back and forth along the linear guide rail, and the second drive unit drives the roller shaft to roll clockwise or counterclockwise to crush the high-temperature slag and push the slag to the target area; the cooling unit continuously sprays and cools the roller shaft, the balance frame, the gear set, the guide wheel and the linear guide rail to make their temperature no higher than 60°C.
[0042] In at least one embodiment, a gear set and a guide wheel are provided on the balancing frame, and the gear set is used to transmit the power of the second drive unit to the roller shaft to rotate it; the guide wheel cooperates with the linear guide rail, and under the drive of the first drive unit, the guide wheel moves along the linear rail.
[0043] The specific implementation process and technical effects of the embodiments of the present application will be described in detail below with reference to the accompanying drawings.
[0044] like Figure 1One embodiment of the present application provides a system for recovering heat energy from steelmaking slag, which includes a high-temperature heat exchange system 100, a medium-temperature heat exchange system 200, and a low-temperature heat exchange system 300 and multiple thermoelectric conversion units, such as thermoelectric conversion units 1-3 in the figure; wherein the high-temperature heat exchange system 100, the medium-temperature heat exchange system 200 and the low-temperature heat exchange system 300 can operate independently in different spaces to achieve flexible site selection and facilitate flexible arrangement according to needs; they can also operate in the same space to reduce heat loss caused by transferring slag and improve heat extraction efficiency. The high-temperature heat exchange system 100, the medium-temperature heat exchange system 200, and the low-temperature heat exchange system 300 are directly connected or connected through a transmission system 400 to achieve closed transmission of slag from the previous system to the next system. The transmission system can be a transfer tool or a transmission crawler. The thermoelectric conversion unit includes a boiler and a steam turbine generator, which convert thermal energy into electrical energy. Its specific operating process is similar to that of conventional technology. The high-temperature heat exchange system 100, the medium-temperature heat exchange system 200, and the low-temperature heat exchange system 300 are connected to the heat transfer pipeline 500 and to their respective thermoelectric conversion units via branch pipes 501. The collected heat is then transferred to the thermoelectric conversion unit for power generation. Alternatively, the high-temperature heat exchange system 100, the medium-temperature heat exchange system 200, and the low-temperature heat exchange system 300 can each be connected to the thermoelectric conversion unit via independent heat transfer pipelines 500.
[0045] like Figure 2 The figure shows a high temperature heat exchange system 100 of one embodiment, which includes a heat collecting bin 50 resistant to high temperature, in which a slag bed ( Figure 2), a slag crushing device 10, an air inlet unit 20, a cooling unit 40 and a dust removal unit 30; wherein the slag bed is used to place high-temperature slag with a temperature of up to 1500°C entering from the inlet, and the slag crushing device 10 rolls, separates, crushes and moves the high-temperature slag in a fluid state set in the slag bed, so that the high-temperature slag releases heat, and the air inlet unit 20 continuously inputs gas into the heat collection bin 50 to form an airflow. After releasing heat, the high-temperature slag changes from a fluid state to a semi-fluid and semi-solid slag. The released heat heats the intake air by thermal radiation, and at the same time forms a high-temperature airflow and moves it toward the heat energy transmission pipeline. After dust removal by the dust removal unit 30, the heat-carrying airflow flows from the heat energy transmission pipeline 500 to the connected thermoelectric conversion unit; as the high-temperature slag is continuously crushed and turned, the heat is released and gradually taken away, and the temperature in the heat collection bin is eventually reduced to about 900°C, and the slag is discharged and prepared to be sent to the medium-temperature heat exchange system 200. The medium-temperature heat exchange system 200 is configured to receive the slag formed by the high-temperature heat exchange system 100 and further reduce its temperature to 300°C. The medium-temperature heat exchange system 200 includes a rotary kiln, which continuously rotates and beats the slag inside it, causing the slag to be further crushed and release heat. The heat energy in the rotary kiln is transmitted to the heat energy transmission pipeline. In order to prevent the heat that cannot be used in time from being wasted, a heat storage unit can be set at the output end of the high-temperature heat exchange system 100 and the medium-temperature heat exchange system 200, or a heat storage unit can be set between the heat energy transmission pipeline 500 and the thermoelectric conversion unit to store energy that cannot be used immediately by the thermoelectric conversion unit. The high-temperature heat exchange system crushes and extracts heat at a rate of one bag of slag (30 tons) every 30 minutes, which greatly improves the efficiency of heat extraction. The existing technology of extracting heat through flue gas cannot perform high-temperature heat exchange and can only obtain residual heat from slag below 900°C.
[0046] like Figure 3 and Figure 4The slag crushing device 10 is shown in a top view and a perspective view. The device 10 is installed on the slag bed 60 and comprises a roller shaft 11, with teeth 110 covering its outer circumference. The roller shaft 11 and teeth 110 are cast from a high-temperature resistant alloy, such as a manganese steel alloy, capable of withstanding temperatures of 1500°C or above. The teeth 110 are arranged in multiple rows along the shaft axis, with adjacent rows staggered to maximize slag crushing. The roller shaft 11 is mounted on a gimbal 16, forming a gantry-like structure. A gear set 12 is mounted on the edge of the gimbal 16 for transmission. The gear set 12 is connected to the output of a second drive unit 15, enabling the second drive unit 15 to drive the roller shaft 11 in clockwise or counterclockwise rotation. Clockwise or counterclockwise rotation of the roller shaft 11 crushes or lifts the slag. The gimbal 16 is mounted on the linear guide 13 via a guide wheel 17. Driven by the first drive unit 14, the guide wheel 17 drives the transmission shaft, the entire gimbal 16, and the roller 11 in linear motion, repeatedly crushing and displacing the slag on the slag bed 60, releasing heat. The roller 11 is also configured to climb slopes, facilitating the handling of slopes formed by slag flow. A cooling unit continuously sprays the roller, gimbal, gear assembly, guide wheel, and linear guide to keep their temperatures below 60°C.
[0047] A low-temperature heat exchange system is also installed after the medium-temperature heat exchange system as needed. This system is configured to receive solid slag from the rotary kiln, extract residual heat, and transfer this heat to the heat energy transmission pipeline and the connected thermoelectric conversion unit. The low-temperature heat exchange system can extract waste heat by simply burying the heat (heat collecting pipe) to carry it away.
[0048] One embodiment further provides a method for recovering heat energy from steelmaking slag, comprising:
[0049] The first step: obtain high-temperature slag from the steelmaking furnace and send it into the high-temperature heat exchange system. The high-temperature heat exchange system is configured to reduce its temperature from 1500℃ to 900℃; the high-temperature heat exchange system includes a high-temperature resistant heat collection bin, a slag bed and a slag breaking device; the slag bed and the slag breaking device are arranged in the heat collection bin, and the slag breaking device crushes and moves the high-temperature slag in a fluid state to release heat and form a semi-fluid and semi-solid slag; the heat collection bin is also connected to an air intake unit; the air intake unit continuously inputs air into the heat collection bin, and the airflow formed by the air intake sends the heat in the heat collection bin into the heat energy The transmission pipeline and the connected thermoelectric conversion unit; wherein, the slag breaking device is arranged on the slag bed, including a roller shaft, a balance frame, a linear guide rail, a cooling unit, and a first drive unit and a second drive unit; the roller shaft is arranged on the balance frame, the first drive unit drives the balance frame to drive the roller shaft to move back and forth along the linear guide rail, and the second drive unit drives the roller shaft to roll clockwise or counterclockwise to crush the high-temperature slag and push the slag to the target area; the outer periphery of the roller shaft is covered with roller teeth, and the roller shaft and roller teeth are cast from a high-temperature resistant alloy and can withstand 1500°C or above.
[0050] The second step is to pour the slag obtained from the high-temperature heat exchange system into the medium-temperature heat exchange system, which is configured to reduce the temperature of the slag to 300°C. The medium-temperature heat exchange system includes a rotary kiln, which continuously rotates and beats the slag inside it, so that the slag is further broken up and releases heat. The heat energy in the rotary kiln is transmitted to the heat energy transmission pipeline and the connected thermoelectric conversion unit.
[0051] A third step may also be included as needed: pouring the slag obtained from the medium-temperature heat exchange system into the low-temperature heat exchange system, continuing to extract the remaining heat and transferring the extracted heat to the heat energy transmission pipeline and the connected thermoelectric conversion unit.
[0052] The above description of the preferred embodiments of the present invention with reference to the accompanying drawings does not limit the scope of the present invention. Those skilled in the art may implement the present invention in various variations without departing from the scope and spirit of the present invention. For example, features of one embodiment may be applied to another embodiment to obtain yet another embodiment. Any modifications, equivalent substitutions, and improvements made within the technical concept of the present invention shall be within the scope of the present invention.
Claims
1. A system for recovering heat energy from steelmaking slag, comprising: a thermoelectric conversion unit, including a boiler and a steam turbine generator, for converting thermal energy into electrical energy; a heat energy transmission pipeline for transmitting the collected hot air to the thermoelectric conversion unit; a high-temperature heat exchange system connected to the heat energy transmission pipeline, the high-temperature heat exchange system being configured to obtain high-temperature slag from a steelmaking furnace and reduce its temperature from 1500°C to 900°C; the high-temperature heat exchange system comprising a high-temperature resistant heat collection bin, a slag bed, and a slag crushing device; the slag bed and slag crushing device being disposed within the heat collection bin, the slag crushing device crushing and moving the fluid high-temperature slag to release heat and form semi-fluid and semi-solid slag; the heat collection bin is further connected to an air intake unit; the air intake unit continuously inputs air into the heat collection bin, and the airflow formed by the air intake transports the heat within the heat collection bin into the heat energy transmission pipeline; and A medium-temperature heat exchange system is connected to the heat energy transmission pipeline; the medium-temperature heat exchange system is configured to receive the slag formed by the high-temperature heat exchange system and further reduce its temperature to 300°C; the medium-temperature heat exchange system includes a rotary kiln, which continuously rotates and beats the slag inside it, so that the slag is further broken and releases heat, and the heat energy in the rotary kiln is transmitted to the heat energy transmission pipeline.
2. The system according to claim 1, wherein: The slag crushing device is arranged on the slag bed, and includes a roller, a balance frame, a linear guide rail, a cooling unit, and a first drive unit and a second drive unit; the roller is arranged on the balance frame, the first drive unit drives the balance frame to drive the roller to move back and forth along the linear guide rail, and the second drive unit drives the roller to roll clockwise or counterclockwise to crush the high-temperature slag and push the slag to the target area.
3. The system according to claim 2, characterized in that: The outer periphery of the roller shaft is covered with roller teeth. The roller shaft and the roller teeth are cast from a high-temperature resistant alloy and can withstand temperatures of 1500°C or above.
4. The system according to claim 2, wherein: The balancing frame is provided with a gear set and a guide wheel, the gear set is used to transmit the power of the second driving unit to the roller shaft to rotate it; the guide wheel cooperates with the linear guide rail, and under the drive of the first driving unit, the guide wheel moves along the linear rail.
5. The system according to claim 2, wherein: The cooling unit continuously sprays and cools the roller, balance frame, gear set, guide wheel and linear guide rail to control their temperature to be no higher than 60°C.
6. The system according to claim 1, wherein: It also includes a low-temperature heat exchange system configured to receive the solid slag received from the rotary kiln, continue to extract residual heat and transfer the extracted heat to the heat energy transmission pipeline and the connected thermoelectric conversion unit.
7. The system according to claim 1, wherein: It also includes a conveying system, which is arranged between the high-temperature heat exchange system and the medium-temperature heat exchange system, and is used to transport the slag output from the high-temperature heat exchange system to the medium-temperature heat exchange system; the conveying system includes a conveyor belt and a bucket elevator, and the bucket elevator is arranged at the end of the conveyor belt, and is used to pour the slag from the conveyor belt into the rotary kiln.
8. The system according to claim 1, wherein: The heat energy transmission pipeline includes multiple branch pipelines and a main pipeline. The high-temperature heat exchange system and the medium-temperature heat exchange system are respectively connected to a branch pipeline; the main pipeline is connected to the thermoelectric conversion unit.
9. The system according to claim 1, wherein: It also includes a heat storage unit, which is arranged between the heat energy transmission pipeline and the thermoelectric conversion unit and is used to store energy that cannot be immediately used by the thermoelectric conversion unit.
10. The system according to claim 1, wherein: It also includes a dust removal unit, which is arranged at the air flow outlet of the high-temperature heat exchange system and the medium-temperature heat exchange system, and is used to remove dust from the air flow carrying heat to prevent dust from entering the heat energy transmission pipeline.
11. The system according to claim 1, wherein: The high-temperature heat exchange system and the medium-temperature heat exchange system are each provided with an independent heat collection chamber.
12. The system according to claim 1, wherein: The thermoelectric conversion units include multiple units, and the heat energy transmission pipeline is connected to the multiple thermoelectric conversion units through multiple branch pipelines. Each branch pipeline is provided with a switch so that the branch pipeline can selectively provide heat energy to the connected thermoelectric conversion unit.
13. A system for recovering heat energy from steelmaking slag, comprising: a thermoelectric conversion unit, including a boiler and a steam turbine generator, for converting thermal energy into electrical energy; A heat energy transmission pipeline, used for transmitting the collected hot air to the thermoelectric conversion unit; A high-temperature heat exchange system is connected to the heat energy transmission pipeline, and the high-temperature heat exchange system is configured to obtain high-temperature slag from the steelmaking furnace and reduce its temperature from 1500°C to 900°C; the high-temperature heat exchange system includes a high-temperature resistant heat collection bin, a slag bed and a slag breaking device; the slag bed and the slag breaking device are arranged in the heat collection bin, and the slag breaking device crushes and moves the high-temperature slag in a fluid state to release heat and form semi-fluid and semi-solid slag; the heat collection bin is also connected to an air intake unit; the air intake unit continuously inputs air into the heat collection bin, and the airflow formed by the air intake sends the heat in the heat collection bin into the heat energy transmission pipeline.
14. The system according to claim 13, wherein: The slag crushing device is arranged on the slag bed, and includes a roller, a balance frame, a linear guide, a cooling unit, and a first drive unit and a second drive unit; the outer periphery of the roller is covered with roller teeth, and the roller and roller teeth are cast from a high-temperature resistant alloy and can withstand 1500°C or above; the roller is arranged on the balance frame, and the first drive unit drives the balance frame to drive the roller to move back and forth along the linear guide, and the second drive unit drives the roller to roll clockwise or counterclockwise to crush the high-temperature slag and push the slag to the target area; the cooling unit continuously sprays and cools the roller, balance frame, gear set, guide wheel and linear guide to make their temperature no higher than 60°C.
15. The system according to claim 14, characterized in that: The balancing frame is provided with a gear set and a guide wheel, and the gear set is used to transmit the power of the second driving unit to the roller shaft to rotate; The guide wheel cooperates with the linear guide rail, and is driven by the first driving unit to move along the linear rail.