A device and method for recovering waste heat from blast furnace slag flushing water

Abstract

The present invention discloses a device and method for recovering waste heat from slag flushing water in a blast furnace, and relates to metal smelting technology. The present invention recovers heat from water vapor discharged from a steam discharge box through a heat exchanger, and at the same time recovers the water resources discharged externally, and absorbs and utilizes the "useless" heat released by the steam discharge box through an annular heat absorption box, and circulates and controls the absorbed heat and the recovered water, and transmits them to an ore heating mechanism. When the ore raw material passes through this section, it further absorbs heat, and the temperature of the ore raw material when entering the blast furnace is further increased, thereby reducing the heating amount of the ore raw material in the blast furnace, and efficiently realizing the subsequent treatment of the slag.

Description

Technical Field

[0001] The present invention relates to the technical field of metal smelting, and in particular to a device and method for recovering waste heat from blast furnace slag flushing water. Background Art

[0002] During ironmaking in a blast furnace, the slag produced is granulated with cold water, and then the slag water enters the steam discharge box to filter and drain the slag, and evaporate the wet slag. When the steam discharge box is heated, the device itself emits a lot of heat to the surrounding area, and the water vapor generated when heating and evaporating the slag also directly discharges a large amount of water and heat, resulting in a large waste of energy and energy consumption. Therefore, how to efficiently recycle the "useless" heat and resources in the slag treatment process has become a problem that needs to be solved. Summary of the invention

[0003] The technical problem to be solved by the present invention is to provide a blast furnace slag flushing water waste heat recovery device and method, thereby efficiently realizing the recovery and utilization of waste heat in the subsequent treatment process of slag, while realizing the recycling of water resources and saving the heat supply of the blast furnace.

[0004] In order to solve the above technical problems, the present invention is achieved through the following technical solutions:

[0005] The present invention provides a device for recovering waste heat from slag flushing water of a blast furnace, comprising a flushing box located at the outlet side of the blast furnace, a steam discharge box connected to the flushing box through a pipeline and used for evaporating moisture in slag, a water storage tank used for supplying water to the flushing box, and a conveyor belt used for conveying ore raw materials to the blast furnace, an annular heat absorption box is arranged in the peripheral area of ​​the steam discharge box, a steam recovery pipe is installed at the steam discharge outlet of the steam discharge box, and a heat exchange cylinder is connected to the end of the steam recovery pipe.

[0006] The outside of the heat exchange cylinder is an insulating cylinder shell, and an inner cylinder heat absorption layer is built in the heat exchange cylinder. A first water storage annular cavity is formed between the insulating cylinder shell and the inner cylinder heat absorption layer. A first temperature sensor, a first low-level liquid level sensor, and a first high-level liquid level sensor located above the first low-level liquid level sensor are arranged in the first water storage annular cavity. A heat separation cavity is formed in the inner surrounding area of ​​the inner cylinder heat absorption layer. An inner cavity low-level liquid level sensor and an inner cavity high-level liquid level sensor located above the inner cavity low-level liquid level sensor are arranged at the bottom of the heat separation cavity. The end of the steam recovery pipe is connected with the top area of ​​the heat separation cavity. A high-level heat absorption radiant plate and a low-level heat absorption fan-shaped platform located below the high-level heat absorption radiant plate are arranged in the inner surrounding area of ​​the inner cylinder heat absorption layer.

[0007] The annular heat absorption box is provided with an inner surrounding heat absorption layer facing the steam discharge box, and a second water storage annular cavity is formed between the heat insulating outer shell of the annular heat absorption box and the inner surrounding heat absorption layer. A second temperature sensor, a second low-level liquid level sensor, and a second high-level liquid level sensor located on the upper side of the second low-level liquid level sensor are arranged in the second water storage annular cavity.

[0008] An ore heating mechanism is arranged at the conveyor belt position, and the ore heating mechanism comprises an upper heat-insulating cover shell, and a heat-dissipating detour pipe area located below the upper heat-insulating cover shell, in which heat-dissipating metal pipes are installed in a detour distribution, and the heat-dissipating metal pipes comprise a detour pipe inlet end located at an upstream position thereof and a detour pipe outlet end located at a downstream position thereof, wherein the pipe diameter of the heat-dissipating metal pipe gradually decreases from the detour pipe inlet end to the detour pipe outlet end, the detour pipe inlet end is connected to a main inlet pipe, and the detour pipe outlet end is connected to a main outlet pipe, a first multi-way control valve is arranged at the upstream end of the main inlet pipe, a second multi-way control valve is arranged at the downstream end of the main outlet pipe, and a third temperature sensor is arranged at the main outlet pipe.

[0009] A first hot liquid supply pipe is connected between the bottom of the first water storage annular cavity of the heat exchange tube and one of the branches of the first multi-way control valve, a first cold liquid return pipe is connected between the top of the first water storage annular cavity of the heat exchange tube and one of the branches of the second multi-way control valve, a cold liquid branch pipe is connected between the bottom of the heat separation inner cavity of the heat exchange tube and the top of the second water storage annular cavity of the annular heat absorption box. A second hot liquid supply pipe is connected between the bottom of the second water storage annular cavity of the annular heat absorption box and another branch of the first multi-way control valve, and a water storage branch pipe is connected between the water storage tank and another branch of the second multi-way control valve.

[0010] As a preferred technical solution of the waste heat recovery device of the present invention: the steam recovery pipe is provided with a slag ash filter, and the slag ash filter has a built-in multi-layer filter element structure.

[0011] As a preferred technical solution of the waste heat recovery device of the present invention: the upper side surface of the low-position heat absorbing fan-shaped platform is an inclined surface, and the low-position heat absorbing fan-shaped platform is located directly below the empty slot area of ​​the high-position heat absorbing radiant plate.

[0012] As a preferred technical solution of the waste heat recovery device of the present invention: the horizontal position of the first temperature sensor is lower than the horizontal position of the first low liquid level sensor, and the horizontal position of the second temperature sensor is lower than the horizontal position of the second low liquid level sensor.

[0013] As a preferred technical solution of the waste heat recovery device of the present invention: thermal insulation curtains are provided at the opening positions on both sides of the upper heat-insulating cover shell facing the conveyor belt.

[0014] As a preferred technical solution of the waste heat recovery device of the present invention: the heat separation inner cavity of the heat exchange tube is connected with an airflow branch pipe, and the end of the airflow branch pipe is connected to the gas processing equipment. The horizontal height position of the connection between the airflow branch pipe and the heat separation inner cavity is higher than the horizontal position of the inner cavity high-level liquid level sensor.

[0015] As a preferred technical solution of the waste heat recovery device of the present invention: water pumps are arranged on the cold liquid branch pipe, the first hot liquid supply pipe, the second hot liquid supply pipe and the pipeline between the water storage tank and the brewing box.

[0016] The present invention provides a method for recovering waste heat from blast furnace slag flushing water, which includes the following steps:

[0017] S1. The cold water in the water storage tank is introduced into the punching box, and the slag-washing water in the punching box enters the steam discharge box. The steam discharge box heats the slag-washing, and the evaporated water vapor is introduced into the heat separation cavity of the heat exchange cylinder. The heat in the water vapor is absorbed by the heat absorption layer in the cylinder and transferred to the water body in the first water storage ring cavity. The condensed water in the water vapor falls to the bottom of the heat separation cavity.

[0018] S2. When the water in the first water storage annular cavity is heated to the system preset heating temperature and the amount of water in the first water storage annular cavity is not lower than the first low-level liquid level sensor, the water in the first water storage annular cavity is supplied to the heat dissipation metal tube in the heat dissipation detour tube area through the first hot liquid supply pipe, the first multi-way control valve, and the main inlet pipe.

[0019] S3. When the amount of condensed water at the bottom of the thermal separation inner cavity is not lower than the inner cavity low-level liquid sensor, the condensed water is introduced into the second water storage ring cavity through the cold liquid branch pipe. When the amount of condensed water at the bottom of the thermal separation inner cavity drops to the inner cavity low-level liquid sensor, the cold liquid branch pipe stops exporting the condensed water.

[0020] S4. The inner heat absorption layer of the annular heat absorption box absorbs the waste heat released by the steam discharge box to the surroundings. When the water in the second water storage annular cavity is heated to the system preset heating temperature and the amount of water in the second water storage annular cavity is not lower than the second low-level liquid sensor, the water in the second water storage annular cavity is supplied to the heat dissipation metal tube in the heat dissipation detour tube area through the second hot liquid supply pipe, the first multi-way control valve and the main inlet pipe.

[0021] S4. The heat dissipation metal pipe releases the heat introduced into the hot water by the first water storage annular cavity and the second water storage annular cavity to the conveyor belt section covered by the upper heat insulation cover shell.

[0022] S5. The third temperature sensor of the main outflow pipe monitors the temperature of the water flowing out of the ore heating mechanism. If the temperature of the water flowing out of the ore heating mechanism is not higher than the maximum temperature of the "slag flushing water" preset by the system, the second multi-way control valve opens the branch valve connected to the water storage branch pipe, and the water flows into the water storage tank. If the temperature of the water flowing out of the ore heating mechanism is higher than the maximum temperature of the "slag flushing water" preset by the system, the second multi-way control valve opens the branch valve connected to the first cold liquid return pipe, and the water flows back to the first water storage annular cavity.

[0023] Compared with the prior art, the present invention has the following beneficial effects:

[0024] The present invention recovers heat from the water vapor discharged from the steam discharge box through the heat exchange cylinder, and at the same time recovers the externally discharged water resources, and absorbs and utilizes the "useless" heat released by the steam discharge box through the annular heat absorption box, and the absorbed heat and the recovered water are circulated and controlled, and transferred to the ore heating mechanism. The ore raw materials further absorb heat when passing through this section, and the temperature of the ore raw materials when entering the blast furnace is further increased, thereby reducing the heating amount of the ore raw materials in the blast furnace, efficiently realizing the recovery and utilization of waste heat in the subsequent treatment process of slag, realizing the circular utilization of water resources, and saving the heat supply of the blast furnace. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figure 1 It is a schematic diagram of the overall structure of the device of the present invention.

[0026] Figure 2 for Figure 1 Schematic diagram of the structure with a partial enlargement at point A in the middle.

[0027] Figure 3 for Figure 1 Schematic diagram of the structure with a partial enlargement at point B in the middle.

[0028] Figure 4 It is a schematic diagram (top view) of the cooperation between the annular heat absorption box and the steam discharge box in the present invention.

[0029] Figure 5 It is a schematic diagram (top view) of a horizontal cross section of the heat exchange tube in the present invention.

[0030] Among them: 1-blast furnace; 2-punching box; 3-steam discharge box; 4-steam recovery pipe; 5-slag ash filter, 501-filter element; 6-heat exchange cylinder, 601-insulating cylinder shell, 602-heat absorption layer in the cylinder, 603-first water storage ring cavity, 604-heat separation inner cavity, 605-first low-level liquid level sensor, 606-first high-level liquid level sensor, 607-high-level heat absorption radial plate, 608-low-level heat absorption fan-shaped platform, 609-low-level liquid level sensor in the inner cavity, 610-high-level liquid level sensor in the inner cavity, 611-air flow branch pipe, 612-cold liquid branch pipe, 613-first hot liquid supply pipe, 614-first cold liquid reflux pipe, 615-first temperature sensor; 7-gas processing equipment; 8-ring position Heat absorption box, 801-second water storage annular cavity, 802-inner surrounding heat absorption layer, 803-second low-level liquid level sensor, 804-second high-level liquid level sensor, 805-second temperature sensor, 806-second hot liquid supply pipe; 9-ore heating mechanism, 901-upper heat insulation cover, 902-heat dissipation detour pipe area, 903-detour pipe inlet end, 904-detour pipe outlet end, 905-main inlet pipe, 906-main outlet pipe, 907-insulation curtain, 908-third temperature sensor; 10-conveyor belt; 11-ore raw material; 12-solid-liquid filter; 13-water storage tank, 1301-water storage branch pipe; 14-first multi-way control valve; 15-second multi-way control valve; 16-water pump. DETAILED DESCRIPTION

[0031] In order to make the purpose, technical solution and advantages of the present invention more clearly understood, the present invention is further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not intended to limit the present invention.

[0032] Embodiment 1: The present invention relates to a blast furnace slag flushing water waste heat recovery device, the main structure of which is as follows:

[0033] See also Figure 1 A blasting box 2 is arranged at the outlet side of the blast furnace 1. The blasting box 2 is connected to the steam discharge box 3 through a pipeline. The steam discharge box 3 is used to evaporate the moisture of the slag. The water storage tank 13 supplies water to the blasting box 2. The conveyor belt 10 transports the ore raw material 11 to the blast furnace 1. The annular heat absorption box 8 is arranged in the peripheral area of ​​the steam discharge box 3. The steam recovery pipe 4 is installed at the steam discharge outlet of the steam discharge box 3, and the heat exchange tube 6 is installed at the end of the steam recovery pipe 4. The steam recovery pipe 4 is equipped with a slag ash filter 5. The slag ash filter 5 has a built-in multi-layer filter element 501 structure to filter the slag ash "washed up" in the steam. The cold liquid branch pipe 612, the first hot liquid supply pipe 613, the second hot liquid supply pipe 806 and the pipeline between the water storage tank 13 and the blasting box 2 are all equipped with a water pump 16, such as Figure 1 The dashed arrow indicates the direction of water flow.

[0034] See also Figure 2 , an insulating shell 601 is arranged outside the heat exchange shell 6, an inner heat absorption layer 602 is arranged inside the heat exchange shell 6, a first water storage annular cavity 603 is arranged between the insulating shell 601 and the inner heat absorption layer 602, a first temperature sensor 615, a first low level sensor 605, and a first high level sensor 606 located above the first low level sensor 605 are arranged inside the first water storage annular cavity 603, a heat separation inner cavity 604 is located inside the inner heat absorption layer 602, an inner cavity low level sensor 609 and an inner cavity high level sensor 610 are arranged at the bottom of the heat separation inner cavity 604, and the inner cavity high level sensor 610 is located above the inner cavity low level sensor 609. The end of the steam recovery pipe 4 is connected to the top area of ​​the heat separation inner cavity 604. The airflow branch pipe 611 is connected to the heat separation inner cavity 604 of the heat exchange shell 6, and the outer end of the airflow branch pipe 611 is connected to the gas processing device 7. Among them, the horizontal height position of the position where the air flow branch pipe 611 is connected to the heat separation inner cavity 604 is higher than the horizontal position of the inner cavity high-level liquid level sensor 610. When the condensed water reaches the inner cavity high-level liquid level sensor 610, it will be discharged faster to avoid water overflow.

[0035] See also Figure 2 , Figure 5 , a high-position heat absorbing radiant plate 607 and a low-position heat absorbing fan-shaped platform 608 located below the high-position heat absorbing radiant plate 607 are arranged inside the heat absorbing layer 602 in the cylinder. The upper side surface of the low-position heat absorbing fan-shaped platform 608 is an inclined surface, and the low-position heat absorbing fan-shaped platform 608 is located directly below the empty slot area of ​​the high-position heat absorbing radiant plate 607. The hot air flow first passes through the high-position heat absorbing radiant plate 607, and a part of the hot air flow contacts the high-position heat absorbing radiant plate 607, and part of the heat in the hot air flow is absorbed, and part of the liquid is condensed. The remaining hot air flow that has not absorbed heat passes through the low-position heat absorbing fan-shaped platform 608, and the heat is absorbed and the liquid is condensed. This structure is convenient for heat absorption and liquid condensation, and also convenient for the liquid to slide downward after condensation.

[0036] See also Figure 1 , Figure 3The conveyor belt 10 is provided with an ore heating mechanism 9, which includes an upper heat-insulating cover 901. A heat-dissipating detour pipe area 902 is formed below the upper heat-insulating cover 901 (i.e., the inner area). Insulating curtains 907 are provided at both sides of the upper heat-insulating cover 901 to cover the opening between the conveyor belt 10 and the upper heat-insulating cover 901. A heat-dissipating metal pipe distributed in a detour is installed in the heat-dissipating detour pipe area 902. The heat-dissipating metal pipe includes a detour pipe inlet end 903 and a detour pipe outlet end 904. The detour pipe inlet end 903 is located at the upstream position of the heat-dissipating metal pipe, and the detour pipe outlet end 904 is located at the downstream position of the heat-dissipating metal pipe. Among them, the diameter of the heat dissipation metal pipe gradually decreases from the detour pipe inlet end 903 to the detour pipe outlet end 904. When hot water enters the heat dissipation metal pipe, the flow rate is slow, and the heat is "sufficiently" transferred to the heat dissipation metal pipe and released to the ore raw material. When the heat of the water body is almost dissipated, the flow rate of the tail section of the heat dissipation metal pipe becomes faster, and the cooled water is accelerated to be discharged from the heat dissipation metal pipe. The detour pipe inlet end 903 is connected to the main inlet pipe 905, and the detour pipe outlet end 904 is connected to the main outlet pipe 906. The first multi-way control valve 14 is installed at the upstream end of the main inlet pipe 905, and the second multi-way control valve 15 is installed at the downstream end of the main outlet pipe 906. The main outlet pipe 906 is equipped with a third temperature sensor 908 (for monitoring the discharge water temperature).

[0037] See also Figure 1 , Figure 2 The bottom of the first water storage annular cavity 603 of the heat exchange tube 6 is connected to the first hot liquid supply pipe 613, and the first hot liquid supply pipe 613 is connected to one of the branches of the first multi-way control valve 14. The top of the first water storage annular cavity 603 of the heat exchange tube 6 is connected to the first cold liquid return pipe 614, and the first cold liquid return pipe 614 is connected to one of the branches of the second multi-way control valve 15. The bottom of the heat separation inner cavity 604 of the heat exchange tube 6 is connected to the cold liquid branch pipe 612, and the cold liquid branch pipe 612 is connected to the second water storage annular cavity 801 (combined with the annular heat absorption box 8) of the annular heat absorption box 8. Figure 4 ) top connection. The second water storage annular cavity 801 of the annular heat absorption box 8 (combined with Figure 4 ) The bottom is connected to the second hot liquid supply pipe 806, the second hot liquid supply pipe 806 is connected to another branch of the first multi-way control valve 14, the water storage tank 13 is connected to the water storage branch pipe 1301, and the water storage branch pipe 1301 is connected to another branch of the second multi-way control valve 15.

[0038] See also Figure 1 , Figure 4The annular heat absorbing box 8 includes an inner heat absorbing layer 802, which faces the steam discharge box 3. The second water storage annular cavity 801 is located between the heat insulation shell of the annular heat absorbing box 8 and the inner heat absorbing layer 802. The second water storage annular cavity 801 is provided with a second temperature sensor 805, a second low-level liquid level sensor 803, and a second high-level liquid level sensor 804. The second high-level liquid level sensor 804 is located above the second low-level liquid level sensor 803. Figure 2 The first high-level liquid level sensor 606, the second high-level liquid level sensor 804, and the inner cavity high-level liquid level sensor 610 are all designed to avoid excessive water in their respective cavities. When the first high-level liquid level sensor 606 and the second high-level liquid level sensor 804 detect a liquid level signal, that is, when there is too much water and the water temperature meets the standard, the water pump on the corresponding pipeline is used to accelerate the water supply rate, which on the one hand increases the heat release degree of the ore heating mechanism 9, and on the other hand increases the amount of water introduced into the water storage tank 13 to a certain extent.

[0039] See also Figure 1 , Figure 5 , the horizontal position of the first temperature sensor 615 is lower than the horizontal position of the first low-level liquid level sensor 605, and the horizontal position of the second temperature sensor 805 is lower than the horizontal position of the second low-level liquid level sensor 803. In this way, when hot water is output to the outside, if the water temperature in the bottom area is not high enough, the water output can be stopped in time, and when the water level reaches the liquid level sensor at the low position, the water temperature of the remaining water can also be monitored.

[0040] Embodiment 2: The present invention relates to a method for recovering waste heat from blast furnace slag flushing water, comprising the following steps:

[0041] Step 1: The cold water in the water storage tank 13 is introduced into the brewing box 2, and the slag-washing water in the brewing box 2 enters the steam discharge box 3. The steam discharge box 3 heats the slag-washing, and the evaporated water vapor is introduced into the thermal separation cavity 604 of the heat exchange cylinder 6. The heat in the water vapor is absorbed by the heat absorption layer 602 in the cylinder and transferred to the water body in the first water storage annular cavity 603, and the condensed water in the water vapor falls to the bottom of the thermal separation cavity 604.

[0042] Step 2: When the water in the first water storage annular cavity 603 is heated to the system preset heating temperature and the amount of water in the first water storage annular cavity 603 is not lower than the first low-level liquid level sensor 605, the water in the first water storage annular cavity 603 is supplied to the heat dissipation metal tube in the heat dissipation detour pipe area 902 through the first hot liquid supply pipe 613, the first multi-way control valve 14, and the main inlet pipe 905.

[0043] Step 3: When the amount of condensed water at the bottom of the heat separation inner cavity 604 is not lower than the inner cavity low level sensor 609, the condensed water is introduced into the second water storage annular cavity 801 through the cold liquid branch pipe 612. When the amount of condensed water at the bottom of the heat separation inner cavity 604 drops to the inner cavity low level sensor 609, the cold liquid branch pipe 612 stops exporting the condensed water at the bottom of the heat separation inner cavity 604 to avoid "dry pumping" of the water pump.

[0044] Step 4: The inner heat absorption layer 802 of the annular heat absorption box 8 absorbs the waste heat released by the steam discharge box 3 to the surrounding area. The water in the second water storage annular cavity 801 is heated to the system preset heating temperature (the heating temperature is the water temperature when the water is supplied to the ore heating mechanism 9. This temperature is set according to the actual scene temperature and is meaningful only when it is higher than the air temperature of the production environment). When the amount of water in the second water storage annular cavity 801 is not lower than the second low-level liquid level sensor 803, the water in the second water storage annular cavity 801 is supplied to the heat dissipation metal tube in the heat dissipation detour pipe area 902 through the second hot liquid supply pipe 806, the first multi-way control valve 14, and the main inlet pipe 905. The heat dissipation metal tube releases the heat introduced into the hot water by the first water storage annular cavity 603 and the second water storage annular cavity 801 to the conveyor belt 10 section covered by the upper insulation cover 901. The ore raw material 11 further absorbs heat when passing through this section. The temperature of the ore raw material 11 when entering the blast furnace 1 is further increased, thereby reducing the amount of heating of the ore raw material in the blast furnace. By recycling the waste heat in the subsequent treatment of slag and recycling various forms of water resources, the originally "useless" heat is also provided to the ore raw material 11, saving the heat supply of the blast furnace 1.

[0045] Link 5: The third temperature sensor of the main outlet pipe monitors the temperature of the water flowing out of the ore heating mechanism. Scenario 1: If the temperature of the water flowing out of the ore heating mechanism 9 is not higher than the maximum temperature of the "slag flushing water" preset by the system (in the actual production process, the temperature of the "slag flushing water" should not be too high, generally below 60°C), the second multi-way control valve 15 opens the branch valve connected to the water storage branch pipe 1301 (the second multi-way control valve 15 closes the branch valve connected to the first cold liquid return pipe 614), and the water flows into the water storage tank 13. Scenario 2: If the temperature of the water flowing out of the ore heating mechanism 9 is higher than the maximum temperature of the "slag flushing water" preset by the system, the second multi-way control valve 15 opens the branch valve connected to the first cold liquid return pipe 614, and the second multi-way control valve 15 closes the branch valve connected to the water storage branch pipe 1301, and the water flows back to the first water storage annular cavity 603.

[0046] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A blast furnace slag flushing water waste heat recovery device, comprising a flushing box (2) located at the outlet side of a blast furnace (1), a steam discharge box (3) connected to the flushing box (2) through a pipeline for evaporating slag moisture, a water storage tank (13) for supplying water to the flushing box (2), and a conveyor belt (10) for conveying ore raw materials (11) to the blast furnace (1), characterized in that: An annular heat absorption box (8) is arranged in the peripheral area of ​​the steam discharge box (3); a steam recovery pipe (4) is installed at the steam discharge outlet of the steam discharge box (3); and a heat exchange cylinder (6) is connected to the end of the steam recovery pipe (4); The heat exchange cylinder (6) has an insulating cylinder shell (601) on the outside, and an inner cylinder heat absorption layer (602) is arranged inside the heat exchange cylinder (6). A first water storage annular cavity (603) is formed between the insulating cylinder shell (601) and the inner cylinder heat absorption layer (602). A first temperature sensor (615), a first low-level liquid level sensor (605), and a first high-level liquid level sensor (606) located above the first low-level liquid level sensor (605) are arranged in the first water storage annular cavity (603). The inner cylinder heat absorption layer (602) has a first temperature sensor (615), a first low-level liquid level sensor (605), and a first high-level liquid level sensor (606) located above the first low-level liquid level sensor (605). The heat separation cavity (604) is formed in the surrounding area, the bottom of the heat separation cavity (604) is provided with an inner cavity low-level liquid level sensor (609), and an inner cavity high-level liquid level sensor (610) located above the inner cavity low-level liquid level sensor (609), the end of the steam recovery pipe (4) is connected with the top area of ​​the heat separation cavity (604), and the inner periphery of the inner heat absorption layer (602) of the cylinder is provided with a high-level heat absorption radiant plate (607) and a low-level heat absorption fan-shaped platform (608) located below the high-level heat absorption radiant plate (607); The annular heat absorption box (8) is provided with an inner circumferential heat absorption layer (802) facing the steam discharge box (3); a second water storage annular cavity (801) is formed between the heat-insulating outer shell of the annular heat absorption box (8) and the inner circumferential heat absorption layer (802); a second temperature sensor (805), a second low-level liquid level sensor (803), and a second high-level liquid level sensor (804) located above the second low-level liquid level sensor (803) are arranged in the second water storage annular cavity (801); The conveyor belt (10) is provided with an ore heating mechanism (9), the ore heating mechanism (9) comprising an upper heat-insulating cover shell (901), a heat-dissipating detour pipe area (902) located below the upper heat-insulating cover shell (901), a heat-dissipating metal pipe distributed in a detour is installed in the heat-dissipating detour pipe area (902), the heat-dissipating metal pipe comprising a detour pipe inlet end (903) located at an upstream position thereof, and a detour pipe outlet end (904) located at a downstream position thereof, wherein the pipe diameter of the heat-dissipating metal pipe is The size gradually decreases from the detour pipe inlet end (903) to the detour pipe outlet end (904); the detour pipe inlet end (903) is connected to a main inlet pipe (905); the detour pipe outlet end (904) is connected to a main outlet pipe (906); a first multi-way control valve (14) is arranged at the upstream end of the main inlet pipe (905); a second multi-way control valve (15) is arranged at the downstream end of the main outlet pipe (906); and a third temperature sensor (908) is arranged at the main outlet pipe (906); A first hot liquid supply pipe (613) is connected between the bottom of the first water storage annular cavity (603) of the heat exchange cylinder (6) and one of the branches of the first multi-way control valve (14); a first cold liquid return pipe (614) is connected between the top of the first water storage annular cavity (603) of the heat exchange cylinder (6) and one of the branches of the second multi-way control valve (15); and a cold liquid branch pipe (612) is connected between the bottom of the heat separation inner cavity (604) of the heat exchange cylinder (6) and the top of the second water storage annular cavity (801) of the annular heat absorption box (8); A second hot liquid supply pipe (806) is connected between the bottom of the second water storage annular cavity (801) of the annular heat absorption box (8) and another branch of the first multi-way control valve (14), and a water storage branch pipe (1301) is connected between the water storage tank (13) and another branch of the second multi-way control valve (15).

2. A blast furnace slag flushing water waste heat recovery device according to claim 1, characterized in that: The steam recovery pipe (4) is provided with a slag ash filter (5), and the slag ash filter (5) has a built-in multi-layer filter element (501) structure.

3. A blast furnace slag flushing water waste heat recovery device according to claim 1, characterized in that: The upper side surface of the low-position heat absorbing fan-shaped platform (608) is an inclined surface, and the low-position heat absorbing fan-shaped platform (608) is located directly below the empty slot area of ​​the high-position heat absorbing radiant plate (607).

4. A blast furnace slag flushing water waste heat recovery device according to claim 1, characterized in that: The horizontal position of the first temperature sensor (615) is lower than the horizontal position of the first low liquid level sensor (605), and the horizontal position of the second temperature sensor (805) is lower than the horizontal position of the second low liquid level sensor (803).

5. A blast furnace slag flushing water waste heat recovery device according to claim 1, characterized in that: Insulation curtains (907) are provided at the opening positions on both side ends of the upper heat-insulating cover shell (901) facing the conveyor belt (10).

6. A blast furnace slag flushing water waste heat recovery device according to claim 1, characterized in that: The heat separation inner cavity (604) of the heat exchange cylinder (6) is connected to a gas flow branch pipe (611), and the end of the gas flow branch pipe (611) is connected to a gas processing device (7); The horizontal height position of the connection between the airflow branch pipe (611) and the heat separation inner cavity (604) is higher than the horizontal position of the inner cavity high-level liquid level sensor (610).

7. A blast furnace slag flushing water waste heat recovery device according to claim 1, characterized in that: The cold liquid branch pipe (612), the first hot liquid supply pipe (613), the second hot liquid supply pipe (806) and the pipeline between the water storage tank (13) and the brewing box (2) are all equipped with a water pump (16).

8. A method for recovering waste heat from blast furnace slag flushing water, characterized in that: A blast furnace slag washing water waste heat recovery device according to any one of claims 1 to 7 comprises the following steps: S1. The cold water in the water storage tank (13) is introduced into the brewing box (2), and the slag-washing water in the brewing box (2) enters the steam discharge box (3). The steam discharge box (3) heats the slag-washing, and the evaporated water vapor is introduced into the heat separation cavity (604) of the heat exchange cylinder (6). The heat in the water vapor is absorbed by the heat absorption layer (602) in the cylinder and transferred to the water body in the first water storage annular cavity (603), and the condensed water in the water vapor falls into the bottom of the heat separation cavity (604); S2. When the water in the first water storage annular cavity (603) is heated to the system preset heating temperature and the amount of water in the first water storage annular cavity (603) is not lower than the first low-level liquid sensor (605), the water in the first water storage annular cavity (603) is supplied to the heat dissipation metal pipe in the heat dissipation detour pipe area (902) through the first hot liquid supply pipe (613), the first multi-way control valve (14), and the main inlet pipe (905); S3. When the amount of condensed water at the bottom of the heat separation inner cavity (604) is not lower than the inner cavity low-level liquid level sensor (609), the condensed water is introduced into the second water storage annular cavity (801) through the cold liquid branch pipe (612); S4. When the inner heat absorption layer (802) of the annular heat absorption box (8) absorbs the waste heat released by the steam discharge box (3) to the surroundings, and the water in the second water storage annular cavity (801) is heated to the system preset heating temperature and the amount of water in the second water storage annular cavity (801) is not lower than the second low-level liquid sensor (803), the water in the second water storage annular cavity (801) is supplied to the heat dissipation metal pipe in the heat dissipation detour pipe area (902) through the second hot liquid supply pipe (806), the first multi-way control valve (14), and the main inlet pipe (905); S4. The heat dissipation metal pipe releases the heat introduced into the hot water by the first water storage annular cavity (603) and the second water storage annular cavity (801) to the conveyor belt (10) section covered by the upper heat insulation cover (901); S5. The third temperature sensor of the main outlet pipe monitors the temperature of the water flowing out of the ore heating mechanism; If the temperature of the water flowing out of the ore heating mechanism (9) is not higher than the maximum temperature of the "slag flushing water" preset by the system, the second multi-way control valve (15) opens the branch valve connected to the water storage branch pipe (1301), and the water flows into the water storage tank (13); If the temperature of the water flowing out of the ore heating mechanism (9) is higher than the maximum temperature of the "slag flushing water" preset by the system, the second multi-way control valve (15) opens the branch valve connected to the first cold liquid return pipe (614), and the water flows back to the first water storage annular cavity (603).

9. A method for recovering waste heat from blast furnace slag flushing water according to claim 8, characterized in that: When the amount of condensed water at the bottom of the heat separation inner cavity (604) drops to the inner cavity low-level liquid level sensor (609), the cold liquid branch pipe (612) stops draining the condensed water.

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