High-temperature solid bulk material waste heat recovery system in ferrous metallurgy industry

Abstract

The invention discloses a high-temperature solid bulk waste heat recovery system in the ferrous metallurgy industry, which is characterized in that solid bulk at a waste outlet is classified in real time through an image recognition module by utilizing a high-temperature-resistant binocular vision camera and a Mask R-CNN model, particles with different particle sizes are conveyed to corresponding grading conveying belts, and initial sorting layering is realized; subsequent three stages of sorting hoppers are matched with a layered heat exchange device (air cooling, tubular heat exchanger and drainage cooling combination) through a stepped vibrating screen, a rotary vibrating screen and a multi-stage aperture screen structure, stepped recovery of waste heat of different particles is achieved, high-temperature gas and steam are guided to power generation, drying and preheating links respectively, and the comprehensive utilization rate of heat energy is increased. According to the whole scheme, precise sorting, graded utilization and intelligent management and control of metallurgical waste heat are achieved through multi-module collaborative optimization, the challenges that in the prior art, the waste heat recovery efficiency is limited, and the equipment adaptability is insufficient are overcome, and the requirement for substantive improvement in the technical field is met.

Description

Technical Field

[0001] The present invention relates to the field of waste heat recovery in the iron and steel metallurgical industry, and in particular to a method and system for recovering waste heat from high-temperature solid bulk materials in the iron and steel metallurgical industry. Background Art

[0002] The iron and steel production process generates large quantities of high-temperature bulk solid materials, such as slag and sinter. These materials carry significant amounts of heat, and if not recycled, they would result in significant energy waste. Currently, waste heat recovery technologies for high-temperature bulk solid materials include dry coke quenching (CDQ) waste heat power generation, sintering waste heat power generation, slag cooler waste heat recovery, and material flow heat exchanger waste heat recovery. However, these technologies have limitations. For example, CDQ and sintering waste heat power generation require materials with good air permeability, while most materials are bulk solids with a wide particle size distribution and poor air permeability. Slag coolers can only produce hot water, which does not conform to the principle of "cascaded utilization, high quality, high use" of waste heat. Material flow heat exchanger waste heat recovery suffers from heat exchanger blockage and bulkiness.

[0003] Based on practical observations, existing technologies are unable to effectively recover waste heat from high-temperature bulk solid materials of varying shapes and temperatures. Particles of varying sizes retain varying amounts of heat in a moving bed, resulting in different heat transfer coefficients and patterns for large and small particles, necessitating different optimal heat transfer methods. Furthermore, when bulk solid materials of varying particle sizes are mixed, agglomeration and bridging between particles and between particles and the wall can easily occur. This can lead to blockages when the flow path narrows, impacting the smoothness and stability of material movement. Summary of the Invention

[0004] In view of the problems existing in the prior art, the present invention discloses a waste heat recovery system for high-temperature solid bulk materials in the iron and steel metallurgical industry, which realizes heat exchange classification according to different particle sizes and temperatures.

[0005] A waste heat recovery system for high-temperature solid bulk materials in the iron and steel metallurgical industry, comprising: The intelligent grabbing and transporting mechanism transports large particles (>50mm), medium particles (10-50mm) and small particles (<10mm) to the corresponding grading conveyor belts based on the identification results; the three-stage sorting hopper, each hopper has a built-in vibrating screen and heat exchange device to achieve secondary sorting of particles and waste heat recovery; the waste heat utilization network transports high-temperature gas, medium-temperature gas and steam in a graded manner to the power generation, drying and preheating links.

[0006] Furthermore, the image recognition module includes: a high-temperature resistant binocular vision camera, installed at a height of 3-5m above the waste outlet, with a viewing angle coverage range of ≥120°; an adaptive spectral compensation light source, including near-infrared (850nm) and short-wave infrared (1550nm) dual bands; a deep learning processor, running the MaskR-CNN model, outputting a signal containing target category identification, bounding box coordinates and instance segmentation mask data to the controller of the intelligent grasping and transportation mechanism.

[0007] Furthermore, the intelligent grasping and transporting mechanism includes: a multi-degree-of-freedom robotic arm, the end effector of which can be optionally equipped with an electromagnetic suction cup or a high-temperature resistant grab bucket; a track moving platform arranged along the length of the waste pile with a travel accuracy of ±5mm; a path planning module that generates the optimal grasping trajectory based on image recognition data to avoid material accumulation collisions.

[0008] Furthermore, the structure of the high-temperature resistant grab is as follows: the main material is made of titanium alloy, and the surface of the grab teeth is sprayed with a composite ceramic layer; a built-in water cooling channel, the water inlet temperature is ≤40°C, and the flow control range is 2-5L / min; a pressure sensor array is used to monitor the grabbing force in real time.

[0009] Furthermore, the configuration of the grading conveyor belt includes: large particle conveyor belt: chain plate structure, with high-temperature resistant ceramic lining embedded on the surface; medium particle conveyor belt: corrugated side guard belt, with side guard height adjustable from 100-150mm; fine particle conveyor belt: closed tubular belt.

[0010] Furthermore, the grading configuration of the vibrating screen is as follows: the large particle hopper adopts a stepped vibrating screen with a screen plate inclination of 10°-15° and an aperture classification of greater than 50mm; the medium particle hopper adopts a rotary vibrating screen equipped with an ultrasonic screen cleaning device with a screen aperture of 10mm-50mm; the fine particle hopper adopts a single-layer vibrating screen with a screen aperture of <10mm; The above-mentioned medium particle hopper is divided into two levels, a medium particle primary hopper directly connected to the medium particle conveyor belt and a medium particle secondary hopper arranged below the medium particle primary hopper, and the particles screened by the medium particle primary hopper fall into the medium particle secondary hopper; The fine particle hopper is divided into three levels: a first-level fine particle hopper directly connected to the fine particle conveyor belt, a second-level fine particle hopper arranged below the first-level fine particle hopper, and a third-level fine particle hopper arranged below the second-level fine particle hopper. The particles screened out by the first-level fine particle hopper fall into the second-level fine particle hopper, and the particles screened out by the second-level fine particle hopper fall into the third-level fine particle hopper. The particles screened out from the above-mentioned medium particle secondary hopper are collected into the fine particle secondary hopper; the mesh size of the rotary vibrating screen of the above-mentioned fine particle secondary hopper is less than or equal to 5mm; The heat exchange device built into the above-mentioned large particle hopper, medium particle first-stage hopper and fine particle first-stage hopper is an air-cooled heat exchanger, which outputs high-temperature gas above 600 degrees Celsius; The heat exchange device in the medium-sized particle secondary hopper is an air-cooled heat exchanger combined with a shell-and-tube heat exchanger, which outputs medium-temperature gas and steam at 300-400 degrees Celsius. The heat exchange device in the fine particle secondary hopper is a shell and tube heat exchanger supplemented by air cooling, which outputs saturated steam and 300-400 degrees Celsius medium temperature gas; The heat exchange device in the fine particle three-stage hopper is a serpentine tube water cooling heat exchanger, the water injection flow is greater than or equal to 10t / h, and the auxiliary air cooling output is less than or equal to 200 degrees Celsius warm air.

[0011] Furthermore, it also includes a material pre-cooling module: arranged between the waste outlet and the gripping mechanism, it contains multiple sets of atomizing spray guns; the water spray volume is intelligently controlled to reduce the surface temperature of the material from 1200℃ to 800-900℃; the steam recovery pipeline introduces the latent heat of vaporization into the waste heat utilization network.

[0012] Furthermore, the integrated control of the waste heat utilization network includes: high-temperature gas path: large particle hopper, medium particle first-stage hopper and fine particle first-stage hopper → thermal storage heat exchanger → gas turbine power generation; medium-temperature gas path: medium particle second-stage hopper and fine particle second-stage hopper → multi-effect evaporator → brine treatment system; steam path: fine particle third-stage hopper → ORC low-temperature generator set → circulating water cooling tower.

[0013] The image recognition module collects image information of high-temperature solid bulk materials at the slag discharge port through a high-temperature resistant binocular vision camera, and performs preprocessing operations on the collected images through a built-in processor; The pre-processed images are read using a threshold segmentation algorithm to obtain the rough outline information of the bulk particles in the image, and then the maximum flow minimum cut algorithm is used to obtain the true outline of the bulk particles. All pre-processed images are divided into first-level images, second-level images, and third-level images according to the size of the true outline of the bulk particles in the image information; the bulk materials in the first-level images correspond to large-particle bulk materials, the bulk materials in the second-level images correspond to medium-particle bulk materials, and the bulk materials in the third-level images correspond to small-particle bulk materials; When using the maximum flow minimum cut method to obtain the true contour of bulk particles, the following formula is used:

[0014] in The capacity of the cut that represents the algorithm is expressed as

[0015] in Represents the capacity of each pixel in the bulk particles, expressed as

[0016] in, and Used to represent The horizontal and vertical coordinates of and Used to represent The horizontal and vertical coordinates of and Used to represent The horizontal and vertical coordinates of the bulk material are used to obtain the true contour of the bulk material particles according to the above algorithm; The real contour information is output to the intelligent grasping and transportation mechanism. According to the recognition results, large particles (corresponding to the first-level image) (>50mm), medium particles (corresponding to the second-level image) (10-50mm) and small particles (corresponding to the third-level image) (<10mm) are respectively transported to the corresponding grading conveyor belts; three-level sorting hoppers, each hopper has a built-in vibrating screen and heat exchange device to realize secondary sorting of particles and waste heat recovery.

[0017] Due to the adoption of the above technical solution, the present invention provides a method and system for recovering waste heat from high-temperature solid bulk materials in the iron and steel metallurgical industry, wherein the method performs high-definition image processing on the collected images to obtain the shape of the bulk material particles with accurate size. Therefore, different waste heat recovery structures are adopted for bulk materials of different forms, such as moving beds, heat exchangers, etc., which effectively solves the problem that the existing technology cannot effectively recover waste heat for bulk materials of different forms; in addition, different heat exchange methods are adopted for bulk materials of different temperatures, such as enhanced heat exchange, cascade heat exchange, etc., which fully utilizes the heat carried by the bulk materials and improves energy utilization efficiency; therefore, this method effectively recovers the waste heat of high-temperature solid bulk materials, avoids the huge waste of energy, conforms to the development concept of energy conservation and environmental protection, can effectively avoid the problem of heat exchanger blockage in the existing technology, improves the working reliability of the system, and adopts a cascade heat exchange method to realize cascade utilization and the principle of high-quality and high-use waste heat utilization, and fully utilizes the waste heat of high-temperature bulk materials. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative labor.

[0019] Figure 1 This is a structural block diagram of a high-temperature solid bulk material waste heat recovery system for the steel and metallurgical industry according to the present invention. DETAILED DESCRIPTION

[0020] To make the technical solutions and advantages of the present invention more clear, the technical solutions in the embodiments of the present invention are clearly and completely described below in conjunction with the accompanying drawings in the embodiments of the present invention: In order to enable those skilled in the art to better understand the solutions of 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 embodiments described 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 making creative efforts should fall within the scope of protection of the present invention.

[0021] It should be noted that the terms "first", "second", etc. in the description and claims of the present invention and the above-mentioned drawings are used to distinguish similar objects and are not necessarily used to describe a specific order or sequence. It should be understood that the numbers used in this way can be interchanged where appropriate, so that the embodiments of the present invention described herein can be implemented in an order other than those illustrated or described herein. In addition, the terms "including" and "having" and any variations thereof are intended to cover non-exclusive inclusions. For example, a process, method, system, product or device that includes a series of steps or units is not necessarily limited to those steps or units clearly listed, but may include other steps or units that are not clearly listed or inherent to these processes, methods, products or devices.

[0022] like Figure 1 The following is a waste heat recovery system for high-temperature solid bulk materials in the iron and steel metallurgical industry, comprising: The intelligent grabbing and transporting mechanism transports large particles (>50mm), medium particles (10-50mm) and small particles (<10mm) to the corresponding grading conveyor belts based on the identification results; the three-stage sorting hopper, each hopper has a built-in vibrating screen and heat exchange device to achieve secondary sorting of particles and waste heat recovery; the waste heat utilization network transports high-temperature gas, medium-temperature gas and steam in a graded manner to the power generation, drying and preheating links.

[0023] Furthermore, the image recognition module includes: a high-temperature resistant binocular vision camera, installed at a height of 3-5m above the waste outlet, with a viewing angle coverage range of ≥120°; an adaptive spectral compensation light source, including near-infrared (850nm) and short-wave infrared (1550nm) dual bands; a deep learning processor, running the Mask R-CNN model, outputting a signal containing target category identification, bounding box coordinates and instance segmentation mask data to the controller of the intelligent grasping and transporting mechanism (2).

[0024] The deep learning processor is configured to run the Mask R-CNN model. This model is a deep neural network architecture used for pixel-level instance segmentation and object detection and recognition. Its operation process includes the following core functional modules: Feature extraction (backbone network): Receives input image data from the binocular vision camera and extracts multi-scale, high-level image feature maps through a convolutional neural network (CNN).

[0025] Region Proposal Network (RPN): Based on the extracted feature maps, it generates candidate region bounding boxes containing potential target objects.

[0026] Region of interest alignment: For each candidate region, accurately crop it from the feature map and align its corresponding feature block with a fixed size.

[0027] Target classification and bounding box regression: For each aligned region feature, the target category is identified (output category label) and the bounding box position is precisely adjusted (output bounding box coordinate offset).

[0028] Mask prediction branch: (Mask R-CNN's core innovation and value) Based on object classification and localization, it concurrently predicts a binary mask for each identified object instance. This mask accurately identifies the outline and occupied area of ​​the target object at the pixel level, typically with the same resolution as the corresponding area in the original image.

[0029] The deep learning processor executes the model, ultimately outputting a signal containing the object category identifier, the refined bounding box coordinates, and the corresponding instance segmentation mask data. The instance segmentation mask data provides precise geometric information about the target object, providing a key basis for the subsequent grasping mechanism controller to plan safe and stable grasping poses (such as calculating grasp points based on the object's outline). It is the core support for the system's high-precision grasping operations.

[0030] Furthermore, the intelligent grasping and transporting mechanism includes: a multi-degree-of-freedom robotic arm, the end effector of which can be optionally equipped with an electromagnetic suction cup or a high-temperature resistant grab bucket; a track moving platform arranged along the length of the waste pile with a travel accuracy of ±5mm; a path planning module that generates the optimal grasping trajectory based on image recognition data to avoid material accumulation collisions.

[0031] Furthermore, the structure of the high temperature resistant grab is as follows: the main body material is titanium alloy (TC4), the grab teeth surface is sprayed with a composite ceramic layer ( ); built-in water cooling channel, water inlet temperature ≤40℃, flow control range 2-5L / min; pressure sensor array, real-time monitoring of grasping force.

[0032] Furthermore, the configuration of the grading conveyor belt includes: large particle conveyor belt: chain plate structure, with high-temperature resistant ceramic lining embedded on the surface; medium particle conveyor belt: corrugated side guard belt, with side guard height adjustable from 100-150mm; fine particle conveyor belt: closed tubular belt.

[0033] Furthermore, the grading configuration of the vibrating screen is as follows: the large particle hopper adopts a stepped vibrating screen with a screen plate inclination of 10°-15° and an aperture classification of greater than 50mm; the medium particle hopper adopts a rotary vibrating screen equipped with an ultrasonic screen cleaning device with a screen aperture of 10mm-50mm; the fine particle hopper adopts a single-layer vibrating screen with a screen aperture of <10mm; The above-mentioned medium particle hopper is divided into two levels, a medium particle primary hopper directly connected to the medium particle conveyor belt and a medium particle secondary hopper arranged below the medium particle primary hopper, and the particles screened by the medium particle primary hopper fall into the medium particle secondary hopper; The fine particle hopper is divided into three levels: a first-level fine particle hopper directly connected to the fine particle conveyor belt, a second-level fine particle hopper arranged below the first-level fine particle hopper, and a third-level fine particle hopper arranged below the second-level fine particle hopper. The particles screened out by the first-level fine particle hopper fall into the second-level fine particle hopper, and the particles screened out by the second-level fine particle hopper fall into the third-level fine particle hopper. The particles screened out from the above-mentioned medium particle secondary hopper are collected into the fine particle secondary hopper; the mesh size of the rotary vibrating screen of the above-mentioned fine particle secondary hopper is less than or equal to 5mm; The heat exchange device built into the above-mentioned large particle hopper, medium particle first-stage hopper and fine particle first-stage hopper is an air-cooled heat exchanger, which outputs high-temperature gas above 600 degrees Celsius; The heat exchange device in the medium-sized particle secondary hopper is an air-cooled heat exchanger combined with a shell-and-tube heat exchanger, which outputs medium-temperature gas and steam at 300-400 degrees Celsius. The heat exchange device in the fine particle secondary hopper is a shell and tube heat exchanger supplemented by air cooling, which outputs saturated steam and 300-400 degrees Celsius medium temperature gas; The heat exchange device in the fine particle three-stage hopper is a serpentine tube water cooling heat exchanger, the water injection flow is greater than or equal to 10t / h, and the auxiliary air cooling output is less than or equal to 200 degrees Celsius warm air.

[0034] Furthermore, it also includes a material pre-cooling module: arranged between the waste outlet and the gripping mechanism, it contains multiple sets of atomizing spray guns; the water spray volume is intelligently controlled to reduce the surface temperature of the material from 1200℃ to 800-900℃; the steam recovery pipeline introduces the latent heat of vaporization into the waste heat utilization network.

[0035] Furthermore, the integrated control of the waste heat utilization network includes: high-temperature gas path: large particle hopper, medium particle first-stage hopper and fine particle first-stage hopper → thermal storage heat exchanger → gas turbine power generation; medium-temperature gas path: medium particle second-stage hopper and fine particle second-stage hopper → multi-effect evaporator → brine treatment system; steam path: fine particle third-stage hopper → ORC low-temperature generator set → circulating water cooling tower.

[0036] Furthermore, the image recognition module collects image information of the high-temperature solid bulk material at the slag discharge port through a high-temperature resistant binocular vision camera, and performs preprocessing operations on the collected image through a built-in processor; The pre-processed images are read using a threshold segmentation algorithm to obtain the rough outline information of the bulk particles in the image, and then the maximum flow minimum cut algorithm is used to obtain the true outline of the bulk particles. All pre-processed images are divided into first-level images, second-level images, and third-level images according to the size of the true outline of the bulk particles in the image information; the bulk materials in the first-level images correspond to large-particle bulk materials, the bulk materials in the second-level images correspond to medium-particle bulk materials, and the bulk materials in the third-level images correspond to small-particle bulk materials; When using the maximum flow minimum cut method to obtain the true contour of bulk particles, the following formula is used:

[0037] in The capacity of the cut that represents the algorithm is expressed as

[0038] in Represents the capacity of each pixel in the bulk particles, expressed as

[0039] in, and Used to represent The horizontal and vertical coordinates of and Used to represent The horizontal and vertical coordinates of and Used to represent The horizontal and vertical coordinates of the bulk material are used to obtain the true contour of the bulk material particles according to the above algorithm; The real contour information is output to the intelligent grasping and transportation mechanism. According to the recognition results, large particles (corresponding to the first-level image) (>50mm), medium particles (corresponding to the second-level image) (10-50mm) and small particles (corresponding to the third-level image) (<10mm) are respectively transported to the corresponding grading conveyor belts; three-level sorting hoppers, each hopper has a built-in vibrating screen and heat exchange device to realize secondary sorting of particles and waste heat recovery.

[0040] The bulk material temperature of the large particle hopper, medium particle first-stage hopper, and small particle first-stage hopper is reduced from 1450℃ to about 900℃ after heat exchange; For medium particle secondary hopper and small particle secondary hopper, the bulk material temperature is reduced from 900℃ to about 600℃; for small particle tertiary hopper, the bulk material temperature is reduced from 600℃ to about 300℃.

[0041] High-temperature waste heat with a temperature above 900℃ is used for high-quality purposes such as power generation and heating; medium-temperature waste heat with a temperature between 600℃ and 900℃ is used for medium-quality purposes such as production process heating; low-temperature waste heat with a temperature between 100℃ and 200℃ is used for low-quality purposes such as domestic hot water supply.

[0042] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it. Although the present invention has been described in detail with reference to the above embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the above embodiments, or replace some or all of the technical features therein with equivalents. However, these modifications or replacements do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of the present invention.

Claims

1. A waste heat recovery system for high-temperature solid bulk materials in the iron and steel metallurgical industry, characterized in that: include: Image recognition module, deployed at the waste outlet or above the material pile, is used to identify the particle size distribution of high-temperature solid waste in real time; The intelligent grabbing and transporting mechanism transports large particles (>50mm), medium particles (10-50mm) and small particles (<10mm) to the corresponding grading conveyor belts based on the identification results; the three-stage sorting hopper, each hopper has a built-in vibrating screen and heat exchange device to achieve secondary sorting of particles and waste heat recovery; the waste heat utilization network transports high-temperature gas, medium-temperature gas and steam in a graded manner to the power generation, drying and preheating links.

2. A waste heat recovery system for high-temperature solid bulk materials in the iron and steel metallurgical industry according to claim 1, characterized in that: The image recognition module includes: a high-temperature resistant binocular vision camera, installed at a height of 3-5m above the waste outlet, with a viewing angle coverage range of ≥120°; an adaptive spectral compensation light source, including near-infrared and short-wave infrared dual bands; a deep learning processor, running the MaskR-CNN model, outputting a signal containing target category identification, bounding box coordinates and instance segmentation mask data to the controller of the intelligent grasping and transportation mechanism.

3. A waste heat recovery system for high-temperature solid bulk materials in the iron and steel metallurgical industry according to claim 1 or 2, characterized in that: The intelligent grabbing and transporting mechanism includes: a multi-degree-of-freedom robotic arm, the end effector of which can be equipped with an electromagnetic suction cup or a high-temperature resistant grab bucket; a track-moving platform arranged along the length of the waste pile with a travel accuracy of ±5mm; and a path planning module that generates the optimal grabbing trajectory based on image recognition data to avoid collisions with material piles.

4. The high-temperature solid bulk material waste heat recovery system for the iron and steel metallurgical industry according to claim 1 is characterized in that: The structure of the high-temperature resistant grab is as follows: the main material is made of titanium alloy, and the surface of the grab teeth is sprayed with a composite ceramic layer; a built-in water cooling channel, the water inlet temperature is ≤40°C, and the flow control range is 2-5L / min; a pressure sensor array is used to monitor the grab force in real time.

5. The high-temperature solid bulk material waste heat recovery system for the iron and steel metallurgical industry according to claim 1 is characterized in that: The configuration of the grading conveyor belt includes: large particle conveyor belt: chain plate structure, with high temperature resistant ceramic lining embedded on the surface; medium particle conveyor belt: corrugated sidewall belt, with sidewall height adjustable from 100-150mm; fine particle conveyor belt: closed tubular belt.

6. The high-temperature solid bulk material waste heat recovery system for the iron and steel metallurgical industry according to claim 1, characterized in that: The grading configuration of the vibrating screen is as follows: the large particle hopper adopts a stepped vibrating screen with a screen plate inclination of 10°-15° and an aperture classification of greater than 50mm; the medium particle hopper adopts a rotary vibrating screen equipped with an ultrasonic screen cleaning device with a screen aperture of 10mm-50mm; the fine particle hopper adopts a single-layer vibrating screen with a screen aperture of <10mm; The above-mentioned medium particle hopper is divided into two levels, a medium particle primary hopper directly connected to the medium particle conveyor belt and a medium particle secondary hopper arranged below the medium particle primary hopper, and the particles screened by the medium particle primary hopper fall into the medium particle secondary hopper; The fine particle hopper is divided into three levels: a first-level fine particle hopper directly connected to the fine particle conveyor belt, a second-level fine particle hopper arranged below the first-level fine particle hopper, and a third-level fine particle hopper arranged below the second-level fine particle hopper. The particles screened out by the first-level fine particle hopper fall into the second-level fine particle hopper, and the particles screened out by the second-level fine particle hopper fall into the third-level fine particle hopper. The particles screened out from the above-mentioned medium particle secondary hopper are collected into the fine particle secondary hopper; the mesh size of the rotary vibrating screen of the above-mentioned fine particle secondary hopper is less than or equal to 5mm; The heat exchange device built into the above-mentioned large particle hopper, medium particle first-stage hopper and fine particle first-stage hopper is an air-cooled heat exchanger, which outputs high-temperature gas above 600 degrees Celsius; The heat exchange device in the medium-sized particle secondary hopper is an air-cooled heat exchanger combined with a shell-and-tube heat exchanger, which outputs medium-temperature gas and steam at 300-400 degrees Celsius. The heat exchange device in the fine particle secondary hopper is a shell and tube heat exchanger supplemented by air cooling, which outputs saturated steam and 300-400 degrees Celsius medium temperature gas; The heat exchange device in the fine particle three-stage hopper is a serpentine tube water cooling heat exchanger, the water injection flow is greater than or equal to 10t / h, and the auxiliary air cooling output is less than or equal to 200 degrees Celsius warm air.

7. The high-temperature solid bulk material waste heat recovery system for the iron and steel metallurgical industry according to claim 1, characterized in that: It also includes a material pre-cooling module: arranged between the waste outlet and the gripping mechanism, it contains multiple sets of atomizing spray guns; the water spray volume is intelligently controlled to reduce the surface temperature of the material from 1200°C to 800-900°C; the steam recovery pipeline introduces the latent heat of vaporization into the waste heat utilization network.

8. The high-temperature solid bulk material waste heat recovery system for the iron and steel metallurgical industry according to claim 6, characterized in that: The integrated control of the waste heat utilization network includes: high-temperature gas path: large particle hopper, medium particle first-stage hopper and fine particle first-stage hopper → thermal storage heat exchanger → gas turbine power generation; medium-temperature gas path: medium particle second-stage hopper and fine particle second-stage hopper → multi-effect evaporator → brine treatment system; steam path: fine particle third-stage hopper → ORC low-temperature generator set → circulating water cooling tower.

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