Molten steel slag centrifugal granulation treatment and waste heat recovery system

Abstract

The invention relates to a molten steel slag centrifugal granulation treatment and waste heat recovery system which is characterized in that a slag inlet is formed in the top of a centrifugal granulation bin, a rotating disc and a rotation driving motor are arranged in the centrifugal granulation bin, the rotating disc is arranged below the slag inlet, and the rotating disc is driven by the rotation driving motor; the low-melting-point eutectic metal self-flowing bed waste heat boiler is arranged below the centrifugal granulation bin, a self-flowing bed waste heat boiler heat exchange pipe is arranged in the low-melting-point eutectic metal self-flowing bed waste heat boiler, and low-melting-point eutectic metal is loaded in the self-flowing bed waste heat boiler heat exchange pipe. High-grade waste heat recovery of the high-temperature molten steel slag is achieved, the blank of heat energy recovery of a steel mill is filled up, and energy conservation, emission reduction and carbon reduction of the steel mill are greatly promoted. The two links of centrifugal granulation treatment and waste heat recovery are comprehensively and integrally designed, the structure is simpler and more compact, the efficiency is higher, operation is easy and convenient, the production implementation process is safe, and the device can be applied and popularized in ferrous metallurgy enterprises.

Description

Technical Field

[0001] The invention relates to the technical field of solid waste treatment, and in particular to a molten steel slag centrifugal granulation treatment and waste heat recovery system. Background Art

[0002] The existing slag treatment processes mainly include hot pouring, water quenching, air quenching, atmospheric pressure pool hot stuffing and roller crushing-pressure hot stuffing, etc. Among them, the hot pouring method, water quenching method and air quenching method are extensive, greatly waste resources and cause serious pollution to the environment, and are relatively backward slag treatment technologies; the atmospheric pressure pool hot stuffing process is inefficient, time-consuming, and consumes a lot of water, and the waste heat resources of the slag are completely wasted. Roller crushing-pressurized hot stuffing technology is a relatively advanced slag treatment technology, which greatly improves the treatment efficiency of slag. However, this technology only recovers the waste heat of slag in the pressurized hot stuffing stage. This process recovers the waste heat of slag below 500°C, while the slag with a temperature of up to 1400°C-1600°C in the roller crushing process is cooled by direct water spraying, resulting in a large amount of high-grade thermal energy being directly wasted without being effectively recovered and utilized. At the same time, there is a risk of explosion when water is directly sprayed on high-temperature slag. On the other hand, the dust-containing steam needs to be treated after water spray cooling, and the roller crushing process has to be equipped with a dust removal device with complicated steps, high investment cost and large footprint, which increases the complexity of the entire system and becomes an important factor hindering slag treatment and waste heat recovery.

[0003] Therefore, it is necessary to provide a molten steel slag centrifugal granulation treatment and waste heat recovery system. In view of the above shortcomings in the high-temperature steel slag treatment process, a new comprehensive treatment technology is sought to simplify the process flow and realize the efficient recovery of high-grade waste heat resources of steel slag in the steel slag treatment process. Summary of the invention

[0004] In view of this, the object of the present invention is to provide a centrifugal granulation processing and waste heat recovery system for molten steel slag, which integrates the centrifugal granulation system and the waste heat recovery system, and centrifugally granulates the molten steel slag into high-temperature solid steel slag particles through the centrifugal force of a high-speed rotating disk, and then recovers the high-grade waste heat in the steel slag particles through the low-melting point eutectic metal of the waste heat recovery system, and separates the steam-water mixture through a steam drum to generate steam for grid connection.

[0005] In order to solve the above technical problems, the present invention adopts the following technical solutions:

[0006] A molten steel slag centrifugal granulation treatment and waste heat recovery system comprises a centrifugal granulation system and a waste heat recovery system, wherein the centrifugal granulation system comprises a centrifugal granulation bin, a slag inlet is provided at the top of the centrifugal granulation bin, a rotating disk and a rotating drive motor are provided in the centrifugal granulation bin, the rotating disk is arranged below the slag inlet, and the rotating disk is driven by the rotating drive motor; the waste heat recovery system comprises a low-melting point eutectic metal self-flowing bed waste heat boiler, the low-melting point eutectic metal self-flowing bed waste heat boiler is arranged below the centrifugal granulation bin, the low-melting point eutectic metal self-flowing bed waste heat boiler is provided with a self-flowing bed waste heat boiler heat exchange tube, and the low-melting point eutectic metal is loaded in the heat exchange tube of the self-flowing bed waste heat boiler.

[0007] The centrifugal granulation bin is used to granulate the molten steel slag entering through the slag inlet and to quickly cool the molten steel slag into high-temperature solid steel slag particles. The rotating disk is used to hold the molten steel slag and quickly throw out the molten steel slag by high-speed rotation to ensure that the molten steel slag forms high-temperature solid steel slag particles and improve the waste heat recovery efficiency. The rotating disk adopts a concave groove type, and the molten steel slag can be thrown out obliquely upward at the edge of the rotating disk. The rotary drive motor is used to drive the high-speed rotation of the rotating disk to provide power for the centrifugal granulation treatment of the molten steel slag. The low-melting point eutectic metal self-flowing bed waste heat boiler is connected to the centrifugal granulation bin to recover the high-temperature solid steel slag particles after granulation. The heat exchange tube of the self-flowing bed waste heat boiler is used to load the low-melting point eutectic metal required in the waste heat recovery process and fully exchange heat with the high-temperature solid steel slag particles.

[0008] Preferably, the heat exchange tube of the artesian bed waste heat boiler is a circulation pipeline, and the heat exchange tube of the artesian bed waste heat boiler outside the low-melting-point eutectic metal artesian bed waste heat boiler is provided with a liquid storage tank, a steam generator and a driving pump, and the low-melting-point eutectic metal is arranged in the liquid storage tank. The driving pump is used to drive the low-melting-point eutectic metal to flow in the heat exchange tube of the artesian bed waste heat boiler. The steam generator is used to recover the heat obtained by the low-melting-point eutectic metal from the high-temperature solid steel slag particles to produce a steam-water mixture. The steam generator needs to have a certain pressure bearing capacity, and the flow of the low-melting-point eutectic metal inside it includes but is not limited to coil type, etc.

[0009] Preferably, the waste heat recovery system further comprises a waste heat recovery pipeline, in which desalted water is loaded, and the waste heat recovery pipeline flows through the steam generator and the heat exchange tube of the self-flowing bed waste heat boiler to generate heat exchange. The waste heat recovery pipeline is used to load the desalted water required in the waste heat recovery process, and the desalted water is converted into a steam-water mixture and steam after the steam generator and the heat exchange tube of the self-flowing bed waste heat boiler generate heat exchange.

[0010] Preferably, the waste heat recovery system further comprises a steam drum, the water outlet of which is connected to one end of a waste heat recovery pipeline, and the other end of the waste heat recovery pipeline flows back to the steam drum after passing through a steam generator for gas-liquid separation. The steam drum is used to separate the steam-water mixture generated in the steam generator and then generate steam for grid connection.

[0011] Preferably, the waste heat recovery system further comprises a desalted water replenishment pipeline, which flows through the wall coil of the centrifugal granulation bin and then flows to the water inlet of the steam drum after being heated. The desalted water replenishment pipeline is used to replenish the desalted water used to generate steam for the waste heat recovery system.

[0012] Preferably, the centrifugal granulation system further comprises a bucket lifting device and a finished product bin, the bottom end of the low-melting-point eutectic metal self-flowing bed waste heat boiler is provided with a slag outlet, and the bucket lifting device lifts the steel slag particles flowing out of the slag outlet to the finished product bin. The bucket lifting device is used to feed the solid steel slag particles after heat extraction into the finished product bin through the bucket lifting device, and the finished product bin is used to store the steel slag particles after centrifugal granulation treatment and waste heat recovery for the next step of processing.

[0013] Preferably, the heat exchange tubes of the self-flowing bed waste heat boiler are evenly arranged or staggered in the low melting point eutectic metal self-flowing bed waste heat boiler, and the heat exchange tubes of the self-flowing bed waste heat boiler are made of heat-resistant, wear-resistant and corrosion-resistant materials and are weldable. The heat exchange tubes of the self-flowing bed waste heat boiler are preferably replaceable structures, and the materials include but are not limited to cast steel (ZG270-500, ZG310-570, ZG340-640), stainless steel (304, 309, 321, 316, T91, 408, 409, 410, 440), etc.

[0014] Preferably, the low-melting-point eutectic metal self-flowing bed waste heat boiler is vertical, horizontal, cylindrical or drum-type. The low-melting-point eutectic metal self-flowing bed waste heat boiler is designed to promote slag heat exchange and reasonable layout, and specific parameters can be designed and selected according to actual conditions.

[0015] Preferably, the low melting point eutectic metal is bismuth and bismuth-based alloys, gallium and gallium-based alloys, or lead and lead-based alloys. The low melting point eutectic metal should maintain a single-phase state throughout the waste heat recovery process, and preferably a eutectic metal alloy with extremely high thermal conductivity is selected, which can be selected according to on-site conditions and needs.

[0016] Preferably, the driving pump is an electromagnetic pump. The driving pump can be selected according to the type of the internal low-melting-point eutectic metal. If the heat exchange medium is a material with high electrical conductivity, an electromagnetic pump can be preferably selected.

[0017] The beneficial effects of the present invention are as follows:

[0018] The present invention, by adopting the above technical scheme, realizes the high-grade waste heat recovery of high-temperature molten steel slag, fills the gap of steel mills in the recovery of this part of heat energy, and has a great driving effect on energy conservation, emission reduction and carbon reduction in steel mills. The two links of centrifugal granulation treatment and waste heat recovery are comprehensively integrated and designed, and the steel slag granulation treatment and waste heat recovery process are completed by an integrated process, which reduces the process flow and investment cost. The waste heat recovery design replaces the water spray cooling used in most steel slag treatments, which significantly saves water resources. Compared with the direct water spray cooling method used in most steel slag treatments, the low-melting point eutectic metal remains liquid in the working temperature range, without the risk of explosion, fundamentally solves the safety problem, and avoids the generation of harmful gases, which has environmental advantages. Due to the closed design, the subsequent cumbersome dust removal system is eliminated, which saves electricity consumption, a large amount of space and investment costs for the steel mill. Compared with most steel slag treatment and waste heat recovery devices, the structure is simpler and more compact, the efficiency is higher, the operation is simple, the production implementation process is safe, and it can be promoted and applied in steel metallurgical enterprises.

[0019] The above description is only an overview of the technical solution of the present invention. In order to more clearly understand the technical means of the present invention and implement it according to the contents of the specification, and to make the above and other purposes, technical features and advantages of the present invention easier to understand, one or more preferred embodiments are listed below and described in detail with the accompanying drawings as follows. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] One or more embodiments are exemplarily described by pictures in the corresponding drawings, and these exemplified descriptions do not constitute limitations on the embodiments. Elements with the same reference numerals in the drawings represent similar elements, and unless otherwise stated, the figures in the drawings do not constitute proportional limitations.

[0021] Figure 1 A structural schematic diagram of a molten steel slag centrifugal granulation treatment and waste heat recovery system of the present invention is shown.

[0022] Description of main reference numerals:

[0023] 1-molten steel slag, 2-slag inlet, 3-centrifugal granulation bin, 4-rotating disc, 5-steel slag particles, 6-rotating drive motor, 7-artesian bed waste heat boiler heat exchange tube, 8-low-melting-point eutectic metal artesian bed waste heat boiler, 9-slag outlet, 10-bucket lifting device, 11-finished product bin, 12-low-melting-point eutectic metal, 13-liquid storage tank, 14-steam generator, 15-waste heat recovery pipeline, 16-driving pump, 17-steam drum, 18-desalted water replenishment pipeline. DETAILED DESCRIPTION

[0024] The specific implementation modes of the present invention are described in detail below in conjunction with the accompanying drawings, but it should be understood that the protection scope of the present invention is not limited by the specific implementation modes.

[0025] Unless explicitly stated otherwise, throughout the specification and claims, the term “comprise” or variations such as “include” or “comprising”, etc., will be understood to include the stated elements or components but not to exclude other elements or components.

[0026] In this document, for the convenience of description, spatial relative terms such as "below", "below", "down", "above", "above", "upper", etc. may be used to describe the relationship between one element or feature and another element or feature in the accompanying drawings. It should be understood that the spatial relative terms are intended to include different orientations of the object in use or operation in addition to the orientation depicted in the figure. For example, if the object in the figure is turned over, the element described as being "below" or "below" other elements or features will be oriented "above" the element or feature. Therefore, the exemplary term "below" can include both below and above. Objects may also have other orientations (rotated 90 degrees or other orientations) and the spatial relative terms used in this document should be interpreted accordingly.

[0027] like Figure 1 As shown, a molten steel slag centrifugal granulation processing and waste heat recovery system includes a centrifugal granulation system and a waste heat recovery system, the centrifugal granulation system includes a centrifugal granulation bin 3, a slag inlet 2 is provided on the top of the centrifugal granulation bin 3, a rotating disk 4 and a rotating drive motor 6 are provided in the centrifugal granulation bin 3, the rotating disk 4 is arranged below the slag inlet 2, and the rotating disk 4 is driven by the rotating drive motor 6; the waste heat recovery system includes a low-melting point eutectic metal self-flowing bed waste heat boiler 8, the low-melting point eutectic metal self-flowing bed waste heat boiler 8 is arranged below the centrifugal granulation bin 3, the low-melting point eutectic metal self-flowing bed waste heat boiler 8 is provided with a self-flowing bed waste heat boiler heat exchange tube 7, and the self-flowing bed waste heat boiler heat exchange tube 7 is loaded with low-melting point eutectic metal 12.

[0028] The centrifugal granulation bin 3 is used to granulate the molten steel slag 1 entering through the slag inlet 2 and quickly cool the molten steel slag 1 into high-temperature solid steel slag particles 5. The rotating disk 4 is used to contain the molten steel slag 1 and quickly throw out the molten steel slag 1 by high-speed rotation to ensure that the molten steel slag 1 forms high-temperature solid steel slag particles 5 and improve the waste heat recovery efficiency. The rotating disk 4 adopts a concave groove type, and the molten steel slag 1 can be thrown out obliquely upward at the edge of the rotating disk 4. The rotary drive motor 6 is used to drive the high-speed rotation of the rotating disk 4 to provide power for the centrifugal granulation process of the molten steel slag.

[0029] The low-melting-point eutectic metal self-flowing bed waste heat boiler 8 is connected to the centrifugal granulation bin 3 to recover the high-temperature solid steel slag particles 5 after granulation. The low-melting-point eutectic metal self-flowing bed waste heat boiler 8 is vertical, horizontal, cylindrical or drum-type. The low-melting-point eutectic metal self-flowing bed waste heat boiler 8 is designed to promote the heat exchange of steel slag and has a reasonable layout. The specific parameters can be designed and selected according to actual conditions.

[0030] The heat exchange tube 7 of the self-flowing bed waste heat boiler is used to load the low melting point eutectic metal 12 required in the waste heat recovery process, and fully exchange heat with the high temperature solid steel slag particles 5. The low melting point eutectic metal 12 is bismuth and bismuth-based alloys, gallium and gallium-based alloys, or lead and lead-based alloys. The low melting point eutectic metal 12 should maintain a single-phase state throughout the waste heat recovery process, and preferably uses a eutectic metal alloy with extremely high thermal conductivity, which can be selected according to on-site conditions and needs.

[0031] The heat exchange tubes 7 of the self-flowing bed waste heat boiler are evenly arranged or staggered in the low melting point eutectic metal self-flowing bed waste heat boiler 8. The heat exchange tubes 7 of the self-flowing bed waste heat boiler are made of heat-resistant, wear-resistant and corrosion-resistant materials and are weldable. The heat exchange tubes 7 of the self-flowing bed waste heat boiler are preferably replaceable structures, and the materials include but are not limited to cast steel (ZG270-500, ZG310-570, ZG340-640), stainless steel (304, 309, 321, 316, T91, 408, 409, 410, 440), etc.

[0032] The centrifugal granulation system further includes a bucket lift device 10 and a finished product bin 11. The bottom end of the low-melting-point eutectic metal self-flowing bed waste heat boiler 8 is provided with a slag outlet 9. The bucket lift device 10 lifts the steel slag particles 5 flowing out of the slag outlet 9 to the finished product bin 11. The bucket lift device 10 is used to feed the solid steel slag particles 5 after heat extraction into the finished product bin 11 through the bucket lift device 10. The finished product bin 11 is used to store the steel slag particles 5 after centrifugal granulation treatment and waste heat recovery for the next step of treatment.

[0033] The heat exchange tube 7 of the self-flowing bed waste heat boiler is a circulation pipeline. The heat exchange tube 7 of the self-flowing bed waste heat boiler outside the low-melting eutectic metal self-flowing bed waste heat boiler 8 is provided with a liquid storage tank 13, a steam generator 14 and a driving pump 16. The liquid storage tank 13 is provided with a low-melting eutectic metal 12. The driving pump 16 is used to drive the low-melting eutectic metal 12 to flow in the heat exchange tube 7 of the self-flowing bed waste heat boiler. The driving pump 16 is an electromagnetic pump. The driving pump 16 can be selected according to the type of the internal low-melting eutectic metal 12. If the heat exchange medium is a material with high electrical conductivity, an electromagnetic pump can be preferably used. The steam generator 14 is used to recover the heat obtained by the low-melting eutectic metal 12 from the high-temperature solid steel slag particles 5 to produce a steam-water mixture. The steam generator 14 needs to have a certain pressure bearing capacity, and the flow of the low-melting eutectic metal 12 inside it includes but is not limited to coil type.

[0034] The waste heat recovery system further includes a waste heat recovery pipeline 15, in which desalted water is loaded, and the waste heat recovery pipeline 15 flows through the steam generator 14 to generate heat exchange with the heat exchange tube 7 of the self-flowing bed waste heat boiler. The waste heat recovery pipeline 15 is used to load the desalted water required in the waste heat recovery process, and the desalted water is converted into a steam-water mixture and steam after heat exchange between the steam generator 14 and the heat exchange tube 7 of the self-flowing bed waste heat boiler.

[0035] The waste heat recovery system further includes a steam drum 17, the water outlet of which is connected to one end of a waste heat recovery pipe 15, and the other end of the waste heat recovery pipe 15 flows back to the steam drum 17 for gas-liquid separation after passing through the steam generator 14. The steam drum 17 is used to separate the steam-water mixture generated in the steam generator 14 and then generate steam for grid connection.

[0036] The waste heat recovery system also includes a desalted water replenishment pipeline 18, which flows through the wall coil of the centrifugal granulation bin 3 and then flows to the water inlet of the steam drum 17 after being heated. The desalted water replenishment pipeline 18 is used to replenish the desalted water used to generate steam for the waste heat recovery system.

[0037] The working process of a molten steel slag granulation treatment and waste heat recovery system of the present invention is as follows:

[0038] First, the molten slag 1 is poured into the rotating disk 4 at the center of the centrifugal granulation bin 3 through the slag inlet 2. The rotating disk 4 is directly connected to the rotating drive motor 6. The rotating disk 4 is driven by the rotating drive motor 6 to rotate at a high speed, so that the molten slag 1 is rotated at a high speed and quickly thrown out obliquely upward at the edge of the rotating disk 4 in the concave groove type to ensure that the slag 1 forms high-temperature solid slag particles 5. The low-melting point eutectic metal self-flowing bed waste heat boiler 8 is arranged below the centrifugal granulation bin 3. The high-temperature solid slag particles 5 can flow from the centrifugal granulation bin 3 into the low-melting point eutectic metal self-flowing bed waste heat boiler 8 below, and recover and exchange waste heat with the self-flowing bed waste heat boiler heat exchange pipe 7 in the waste heat recovery system. The solid slag particles 5 after heat exchange flow into the bucket lifting device 10 through the slag outlet 9, and are fed into the finished product bin 11 through the bucket lifting device 10 for the next step of processing.

[0039] The desalted water sent by the desalted water replenishment pipe 18 of the waste heat recovery system is preheated and heated by the coil arranged on the wall of the centrifugal granulation bin 3, and then sent to the steam drum 17. The desalted water is heat-exchanged with the heat obtained by the low-melting-point eutectic metal 12 in the steam generator 14 from the high-temperature solid steel slag particles 5 through the waste heat recovery pipe 15, thereby generating a steam-water mixture. The steam-water mixture is then returned to the steam drum 17 through the waste heat recovery pipe 15 to separate the steam-water mixture generated in the steam generator 14 and then generate steam for grid connection. The low melting point eutectic metal 12 in the heat exchange tube 7 of the artesian bed waste heat boiler is in direct contact with the high temperature solid steel slag particles 5, and the heat is absorbed and taken away by the low melting point eutectic metal 12 flowing in the heat exchange tube 7 of the artesian bed waste heat boiler. The low melting point eutectic metal 12 flows to the steam generator 14 driven by the driving pump 16, and then exchanges heat with desalted water to produce steam. The temperature of the low melting point eutectic metal 12 decreases, and then it flows to the heat exchange tube 7 of the artesian bed waste heat boiler to exchange heat with the steel slag, thus forming the entire waste heat circulation recovery process.

[0040] The foregoing description of specific exemplary embodiments of the present invention is for the purpose of illustration and demonstration. These descriptions are not intended to limit the present invention to the precise form disclosed, and it is clear that many changes and variations can be made based on the above teachings. The purpose of selecting and describing the exemplary embodiments is to explain the specific principles of the present invention and its practical application, so that those skilled in the art can realize and utilize various different exemplary embodiments of the present invention and various different selections and changes. Any simple modifications, equivalent changes and modifications made to the above exemplary embodiments should fall within the scope of protection of the present invention.

Claims

1. A molten steel slag centrifugal granulation treatment and waste heat recovery system, characterized in that: The invention comprises a centrifugal granulation system and a waste heat recovery system, wherein the centrifugal granulation system comprises a centrifugal granulation bin (3), a slag inlet (2) is provided at the top of the centrifugal granulation bin (3), a rotating disk (4) and a rotating drive motor (6) are provided in the centrifugal granulation bin (3), the rotating disk (4) is arranged below the slag inlet (2), and the rotating disk (4) is driven by the rotating drive motor (6); The waste heat recovery system comprises a low-melting-point eutectic metal self-flowing bed waste heat boiler (8), wherein the low-melting-point eutectic metal self-flowing bed waste heat boiler (8) is arranged below a centrifugal granulation bin (3), and a self-flowing bed waste heat boiler heat exchange tube (7) is arranged in the low-melting-point eutectic metal self-flowing bed waste heat boiler (8), and the low-melting-point eutectic metal (12) is loaded in the self-flowing bed waste heat boiler heat exchange tube (7).

2. A molten steel slag centrifugal granulation treatment and waste heat recovery system according to claim 1, characterized in that: The self-flowing bed waste heat boiler heat exchange pipe (7) is a circulation pipe, and the self-flowing bed waste heat boiler heat exchange pipe (7) outside the low-melting-point eutectic metal self-flowing bed waste heat boiler (8) is provided with a liquid storage tank (13), a steam generator (14) and a driving pump (16), and the low-melting-point eutectic metal (12) is provided in the liquid storage tank (13).

3. A molten steel slag centrifugal granulation treatment and waste heat recovery system according to claim 2, characterized in that: The waste heat recovery system further comprises a waste heat recovery pipeline (15), wherein desalted water is loaded in the waste heat recovery pipeline (15), and the waste heat recovery pipeline (15) flows through the steam generator (14) to generate heat exchange with the heat exchange pipe (7) of the gravity bed waste heat boiler.

4. A molten steel slag centrifugal granulation treatment and waste heat recovery system according to claim 3, characterized in that: The waste heat recovery system further comprises a steam drum (17), a water outlet of the steam drum (17) being connected to one end of a waste heat recovery pipeline (15), and the other end of the waste heat recovery pipeline (15) flowing back to the steam drum (17) through the steam generator (14) for gas-liquid separation.

5. A molten steel slag centrifugal granulation treatment and waste heat recovery system according to claim 4, characterized in that: The waste heat recovery system also includes a desalted water replenishment pipeline (18), wherein the desalted water replenishment pipeline (18) flows through the silo wall coil of the centrifugal granulation silo (3) to be heated and then flows to the water inlet of the steam drum (17).

6. The molten steel slag centrifugal granulation treatment and waste heat recovery system according to claim 1, characterized in that: The centrifugal granulation system further comprises a bucket lifting device (10) and a finished product bin (11); a slag outlet (9) is provided at the bottom end of the low-melting-point eutectic metal self-flowing bed waste heat boiler (8); and the bucket lifting device (10) lifts the steel slag particles (5) flowing out of the slag outlet (9) to the finished product bin (11).

7. The molten steel slag centrifugal granulation treatment and waste heat recovery system according to claim 1, characterized in that: The self-flowing bed waste heat boiler heat exchange tubes (7) are evenly arranged or staggered in the low melting point eutectic metal self-flowing bed waste heat boiler (8), and the self-flowing bed waste heat boiler heat exchange tubes (7) are made of heat-resistant, wear-resistant, and corrosion-resistant material and are weldable.

8. The molten steel slag centrifugal granulation treatment and waste heat recovery system according to claim 1, characterized in that: The low-melting-point eutectic metal self-flowing bed waste heat boiler (8) is of vertical, horizontal, cylindrical or drum type.

9. A molten steel slag centrifugal granulation treatment and waste heat recovery system according to claim 2, characterized in that: The low melting point eutectic metal (12) is bismuth and bismuth-based alloys, gallium and gallium-based alloys, or lead and lead-based alloys.

10. A molten steel slag centrifugal granulation treatment and waste heat recovery system according to claim 2, characterized in that: The driving pump (16) is an electromagnetic pump.

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