High-temperature slag heat energy recovery device using water mist air cooling and recovery method

Abstract

The invention discloses a high-temperature slag heat energy recovery device and method using water mist air cooling. Comprising a feeding mechanism, a crushing and lifting mechanism, a solid waste heat recovery furnace, a first-stage waste heat recovery mechanism, a second-stage waste heat recovery mechanism, a water mist generation mechanism, a hot air waste heat recovery furnace and a hot water pipe. A crushing and lifting mechanism is arranged between the feeding mechanism and the solid waste heat recovery furnace, the discharging end of the feeding mechanism is connected with the feeding end of the crushing and lifting mechanism, and the discharging end of the crushing and lifting mechanism is connected with the feeding end of the solid waste heat recovery furnace; a first-stage heat exchange water pipe is arranged in the hot air waste heat recovery furnace, the solid waste heat recovery furnace is provided with a second-stage heat exchange water pipe, and the first-stage heat exchange water pipe and the second-stage heat exchange water pipe are respectively connected with a hot water pipe; the feeding mechanism comprises a conveying unit, a first-stage waste heat recovery mechanism and a second-stage waste heat recovery mechanism which are connected are sequentially arranged on the conveying unit, the second-stage waste heat recovery mechanism is connected with an air inlet of the hot air waste heat recovery furnace, and the first-stage waste heat recovery mechanism is connected with an air outlet of the hot air waste heat recovery furnace. And the water mist generation mechanism is connected with the primary waste heat recovery mechanism. The heat recovery efficiency of multi-stage air cooling is improved, the air consumption is reduced, the production cost is reduced, and the device is more environmentally friendly.

Description

TECHNICAL FIELD

[0001] The present application belongs to the technical field of high-temperature molten slag waste heat recovery, and particularly relates to a high-temperature molten slag heat energy recovery device using water mist air cooling and a recovery method. BACKGROUND

[0002] Due to the presence of impurities in raw materials to a certain extent, high-temperature smelting often produces high-temperature slag. In order to facilitate subsequent treatment and heat recovery, the water quenching process is currently mainly used to treat high-temperature slag in China. After the water quenching process, the temperature of the water after slagging is low, which is a low-grade heat source that is difficult to efficiently utilize. Not only is the heat recovery and utilization low, but a large amount of wastewater is also produced, which is difficult to recover investment in the short term. The sensible heat of smelting slag is a high-grade waste heat resource, and has a high recovery value. With the increasing international competition and the continuous shortage of energy, the metallurgical industry is facing many problems in maintaining sustainable development strategies, one of which is how to efficiently recover the sensible heat of smelting slag.

[0003] The information disclosed in this BACKGROUND section is only for the purpose of increasing the understanding of the background of the present application and should not be taken as an acknowledgment or any form of suggestion that this information forms prior art that is publicly known. SUMMARY

[0004] The present application aims to provide a high-temperature molten slag heat energy recovery device using water mist air cooling and a recovery method, thereby overcoming the defects in the prior art.

[0005] In order to achieve the above object, the application provides a high-temperature molten slag heat energy recovery device using water mist air cooling, which comprises a feeding mechanism, a crushing and lifting mechanism, a solid waste heat recovery furnace, a first-stage waste heat recovery mechanism, a second-stage waste heat recovery mechanism, a water mist generating mechanism, a hot air waste heat recovery furnace and a hot water pipe; the crushing and lifting mechanism is arranged between the feeding mechanism and the solid waste heat recovery furnace, the discharge end of the feeding mechanism is connected with the feeding end of the crushing and lifting mechanism, and the discharge end of the crushing and lifting mechanism is connected with the feeding end of the solid waste heat recovery furnace; the hot air waste heat recovery furnace is provided with a first-stage heat exchange water pipe, and the solid waste heat recovery furnace is provided with a second-stage heat exchange water pipe; the first-stage heat exchange water pipe and the second-stage heat exchange water pipe are connected with the hot water pipe; the feeding mechanism comprises a conveying unit, and the conveying unit is sequentially provided with the first-stage waste heat recovery mechanism and the second-stage waste heat recovery mechanism which are connected with each other; the second-stage waste heat recovery mechanism is connected with the air inlet of the hot air waste heat recovery furnace, the first-stage waste heat recovery mechanism is connected with the air outlet of the hot air waste heat recovery furnace, and the water mist generating mechanism is connected with the first-stage waste heat recovery mechanism; the water mist generating mechanism and the first-stage waste heat recovery mechanism form a first-stage sensible heat recovery, the second-stage waste heat recovery mechanism forms a second-stage sensible heat recovery, the first-stage heat exchange water pipe exchanges heat with the second-stage sensible heat recovery, and the second-stage heat exchange water pipe exchanges heat with the crushed molten slag to recover waste heat.

[0006] Preferably, in the technical scheme, the feeding mechanism comprises an intermediate slag box, a hopper, a cast slag box, a driving roller, a conveying belt, a driven roller and a guide plate; the cast slag box is provided with the driving roller, the conveying belt and the driven roller, the driving roller and the driven roller are connected through the conveying belt, and the driving roller, the conveying belt and the driven roller form a conveying unit; the intermediate slag box is connected with the hopper, the hopper is arranged at the inlet of the cast slag box, the discharge end of the hopper is located at the feeding end of the conveying belt, the discharge end of the conveying belt is provided with the guide plate, the guide plate is located at the outlet of the cast slag box, and the guide plate is connected with the crushing and lifting mechanism; the conveying belt is sequentially provided with the first-stage waste heat recovery mechanism and the second-stage waste heat recovery mechanism.

[0007] Preferably, in the technical scheme, the first-stage waste heat recovery mechanism comprises a first-stage fan, a first-stage main air duct, a first-stage branch air duct, a first-stage upper air injection port, a first-stage lower air injection port and a first-stage air suction port; the first-stage fan is connected with the air outlet of the hot air waste heat recovery furnace, the first-stage fan is connected with the first-stage main air duct, the first-stage upper air injection port and the first-stage lower air injection port are symmetrically arranged on the upper and lower sides of the conveying belt, the first-stage main air duct is connected with the corresponding first-stage upper air injection port and first-stage lower air injection port through the first-stage branch air duct, the first-stage air suction port is arranged above the first-stage upper air injection port, and the first-stage air suction port is connected with the second-stage waste heat recovery mechanism; wherein the first-stage branch air duct corresponding to one first-stage upper air injection port located at the front end of the conveying belt is connected with the water mist generating mechanism.

[0008] Preferably, in the technical solution, the water mist generating mechanism comprises a water inlet pipe, a compressed air pipe, and an air atomizing nozzle, the water inlet pipe is connected with the compressed air pipe, the compressed air pipe is connected with an external air compressor, and the compressed air pipe is connected with the air atomizing nozzle; a first-stage branch air duct corresponding to one first-stage upper air blowing port at the front end of the conveying belt is used as an air inlet pipe, air atomizing nozzles are arranged on the air inlet pipe in a circumferential direction, the air atomizing nozzles are arranged in a spiral on the air inlet pipe, and the air atomizing nozzles are arranged with their jet ends facing the inside of the air inlet pipe; the air atomizing nozzles are used to spray the gas-water mixture in the compressed air pipe into the air inlet pipe in the form of water mist, and the air in the air inlet pipe carries the water mist to be sprayed from one first-stage upper air blowing port at the front end of the conveying belt towards the high-temperature molten slag.

[0009] Preferably, in the technical solution, the secondary waste heat recovery mechanism comprises a secondary fan, a secondary main air duct, a secondary branch air duct, a secondary upper air blowing port, a secondary lower air blowing port, and a secondary air suction port, the secondary fan is connected with the first-stage air suction port, the secondary fan is connected with the secondary main air duct, the secondary upper air blowing port and the secondary lower air blowing port are symmetrically arranged on the upper and lower sides of the conveying belt, respectively, the secondary main air duct is connected with the corresponding secondary upper air blowing port and secondary lower air blowing port through the secondary branch air duct, the secondary air suction port is arranged above the secondary upper air blowing port, and the secondary air suction port is connected with an air inlet of the hot air waste heat recovery furnace.

[0010] Preferably, in the technical solution, the crushing and lifting mechanism comprises a high-temperature crusher and a slag particle elevator, the high-temperature crusher is arranged at the feeding end of the slag particle elevator, the high-temperature crusher is connected with a guide plate, and the discharging end of the slag particle elevator is connected with the feeding end of the solid waste heat recovery furnace.

[0011] A high-temperature molten slag heat energy recovery method using water mist air cooling, comprising the following steps: (1) pouring high-temperature molten slag into an intermediate slag box, the high-temperature molten slag falls into the conveying belt in the casting slag box through a hopper, and a driving roller drives the conveying belt to rotate to forwardly convey the high-temperature molten slag;

[0012] (2) a primary fan blows normal-temperature air into a primary main air duct, the air passes through a primary branch air duct and is blown out from a corresponding first-stage upper air blowing port and a first-stage lower air blowing port, and the high-temperature molten slag on the conveying belt is subjected to primary air cooling; at the same time of blowing air by the primary fan, an external air compressor sends compressed air to a compressed air pipe, the compressed air is mixed with water, and the water mist is sprayed out from the air atomizing nozzle in the air inlet pipe, the air in the air inlet pipe carries the water mist to be sprayed out from one first-stage upper air blowing port at the front end of the conveying belt, the air carrying the water mist contacts the high-temperature molten slag, and the water mist is instantaneously vaporized into high-temperature steam;

[0013] (3) a secondary fan is started, the high-temperature steam and the hot air after heat exchange are discharged into a secondary main air duct through a first-stage air suction port, the air is blown out from a corresponding secondary upper air blowing port and a secondary lower air blowing port through a secondary branch air duct, and the high-temperature molten slag on the conveying belt is subjected to secondary air cooling;

[0014] (4) the hot air after the secondary heat exchange enters the hot air waste heat recovery furnace through the secondary air suction port, in the hot air waste heat recovery furnace, the hot air and the water in the primary heat exchange water pipe perform the third heat exchange, the water absorbs heat and then enters the hot water pipe to be discharged, the cooled air enters the primary air fan to be recycled;

[0015] (5) the high-temperature molten slag after the secondary air cooling on the conveying belt enters the high-temperature crusher through the guide plate to be crushed, the crushed molten slag is conveyed to the solid waste heat recovery furnace by the slag particle elevator;

[0016] (6) in the solid waste heat recovery furnace, the molten slag falls from the top of the solid waste heat recovery furnace, in the falling process of the molten slag, the molten slag and the water in the secondary heat exchange water pipe perform the third heat exchange, the water absorbs the waste heat of the molten slag and then enters the hot water pipe to be discharged, the cooled molten slag falls into the bottom of the solid waste heat recovery furnace to be recovered.

[0017] Preferably, in the technical scheme, in the step (2), after the water mist is contacted with the high-temperature molten slag to be vaporized, the high-temperature molten slag is still dry slag.

[0018] Compared with the prior art, the present application has the following beneficial effects:

[0019] By combining the water mist with the multi-stage air cooling, the latent heat of the water mist vaporization is utilized, the heat recovery efficiency of the multi-stage air cooling is increased, the air consumption is reduced, and the production cost is reduced. In addition, the whole process does not produce waste water, and is more friendly to the environment. BRIEF DESCRIPTION OF DRAWINGS

[0020] Figure 1 It is a structure schematic view of the high-temperature molten slag heat energy recovery device using the water mist air cooling according to the present application;

[0021] Figure 2 It is a partial front view of the air inlet pipe according to the present application;

[0022] Figure 3 It is a top view of the air inlet pipe according to the present application. DETAILED DESCRIPTION

[0023] The specific embodiments of the present application are described in detail below, but it should be understood that the protection scope of the present application is not limited by the specific embodiments.

[0024] Unless otherwise explicitly stated, throughout the specification and claims, the term "comprise" or its variants such as "comprises" or "comprising" will be understood to encompass the stated element or elements or components, but not to the exclusion of any other element or component.

[0025] As Figure 1The utility model discloses a high temperature slag heat energy recovery device using water mist air cooling, including feeding mechanism 1, crushing and lifting mechanism 2, solid waste heat recovery furnace 3, first stage waste heat recovery mechanism 4, second stage waste heat recovery mechanism 5, water mist generating mechanism 6, hot air waste heat recovery furnace 7, hot water pipe 8, the feeding mechanism 1 with solid waste heat recovery furnace 3 is provided with crushing and lifting mechanism 2, the discharge end of feeding mechanism 1 is connected with the feeding end of crushing and lifting mechanism 2, the discharge end of crushing and lifting mechanism 2 is connected with the feeding end of solid waste heat recovery furnace 3, the hot air waste heat recovery furnace 7 is provided with first stage heat exchange water pipe 70, and solid waste heat recovery furnace 3 is provided with second stage heat exchange water pipe 30, and first stage heat exchange water pipe 70, second stage heat exchange water pipe 30 are connected with hot water pipe 8 respectively,

[0026] The feeding mechanism 1 includes intermediate slag tank 10, hopper 11, casting slag tank 12, driving roller 13, conveying belt 14, driven roller 15, guide plate 16, driving roller 13, conveying belt 14, driven roller 15 are arranged in casting slag tank 12, and the driving roller 13 is connected with the driven roller 15 through the conveying belt 14, and the driving roller 13, the conveying belt 14 and the driven roller 15 form a conveying unit, the intermediate slag tank 10 is connected with the hopper 11, the hopper 11 is arranged at the inlet of the casting slag tank 12, the discharge end of the hopper 11 is located at the feeding end of the conveying belt 14, the discharge end of the conveying belt 14 is provided with the guide plate 16, the guide plate 16 is located at the outlet of the casting slag tank 12, and the guide plate 16 is connected with the crushing and lifting mechanism 2, and the conveying belt 14 is sequentially provided with the first stage waste heat recovery mechanism 4 and the second stage waste heat recovery mechanism 5;

[0027] The first stage waste heat recovery mechanism 4 includes first stage fan 40, first stage main air duct 41, first stage branch air duct 42, first stage upper air injection port 43, first stage lower air injection port 44, first stage air suction port 45, the first stage fan 40 is connected with the air outlet of the hot air waste heat recovery furnace 7, the first stage fan 40 is connected with the first stage main air duct 41, the first stage upper air injection port 43 and the first stage lower air injection port 44 are symmetrically arranged on the upper and lower sides of the conveying belt 14, the first stage main air duct 41 passes through the first stage branch air duct 42 and is connected with the corresponding first stage upper air injection port 43 and first stage lower air injection port 44, the first stage air suction port 45 is arranged above the first stage upper air injection port 43, and the first stage air suction port 45 is connected with the second stage waste heat recovery mechanism 5, wherein the first stage branch air duct 42 corresponding to one first stage upper air injection port 43 at the front end of the conveying belt 14 is connected with the water mist generating mechanism 6;

[0028] As Figures 2-3As shown, the water mist generating mechanism 6 includes a water inlet pipe 60, a compressed air pipe 61, and an air atomizing nozzle 62. The water inlet pipe 60 is connected with the compressed air pipe 61, the compressed air pipe 61 is connected with an external air compressor, and the compressed air pipe 61 is connected with the air atomizing nozzle 62. A first-stage branch air duct 42 corresponding to a first-stage upper air blowing port 43 at the front end of the conveying belt 14 is used as an air inlet pipe 46. The air inlet pipe 46 is provided with the air atomizing nozzle 62 in a circumferential direction. The air atomizing nozzle 62 is arranged in a spiral manner on the air inlet pipe 46, and the spraying end of the air atomizing nozzle 62 is arranged towards the inside of the air inlet pipe 46. The air-water mixture in the compressed air pipe is sprayed into the air inlet pipe 46 in the form of water mist through the air atomizing nozzle 62. The air in the air inlet pipe 46 carries the water mist to be sprayed from the corresponding first-stage upper air blowing port 43 towards the high-temperature molten slag.

[0029] The secondary waste heat recovery mechanism 5 includes a secondary air blower 50, a secondary main air duct 51, a secondary branch air duct 52, a secondary upper air blowing port 53, a secondary lower air blowing port 54, and a secondary air suction port 55. The secondary air blower 50 is connected with the first-stage air suction port 45. The secondary air blower 50 is connected with the secondary main air duct 51. The secondary upper air blowing port 53 and the secondary lower air blowing port 54 are symmetrically arranged on the upper and lower sides of the conveying belt 14, respectively. The secondary main air duct 51 is connected with the corresponding secondary upper air blowing port 53 and secondary lower air blowing port 54 through the secondary branch air duct 52. The secondary air suction port 55 is arranged above the secondary upper air blowing port 53 and is connected with the air inlet of the hot air waste heat recovery furnace 7.

[0030] The crushing and lifting mechanism 2 includes a high-temperature crusher 20 and a slag particle elevator 21. The high-temperature crusher 20 is arranged at the feeding end of the slag particle elevator 21. The high-temperature crusher 20 is connected with the guide plate 16. The discharging end of the slag particle elevator 21 is connected with the feeding end of the solid waste heat recovery furnace 3.

[0031] A high-temperature molten slag heat energy recovery method using water mist air cooling includes the following steps: (1) high-temperature molten slag is poured into an intermediate slag tank. The high-temperature molten slag falls into the conveying belt in the casting slag tank through a hopper. The conveying belt is driven to rotate by a driving roller, and the high-temperature molten slag is conveyed forward.

[0032] (2) a first-stage air blower blows normal-temperature air into a first-stage main air duct. The air passes through a first-stage branch air duct and is blown out from the corresponding first-stage upper air blowing port and first-stage lower air blowing port. The high-temperature molten slag on the conveying belt is subjected to primary air cooling. At the same time, an external air compressor sends compressed air to a compressed air pipe. The compressed air is mixed with water, and the water mist is sprayed into the air inlet pipe through the air atomizing nozzle. The air in the air inlet pipe carries the water mist to be sprayed from the first-stage upper air blowing port at the front end of the conveying belt. The air carrying the water mist contacts the high-temperature molten slag, and the water mist is instantly vaporized into high-temperature steam. After the water mist contacts the high-temperature molten slag and is vaporized, the high-temperature molten slag is still dry slag.

[0033] (3) the secondary fan is started, the high-temperature steam and the hot air after heat exchange are discharged into the secondary main air duct through the primary air suction port, and the air is discharged from the corresponding secondary upper air blowing port and secondary lower air blowing port through the secondary branch air duct, so that the high-temperature molten slag on the conveying belt is subjected to secondary air cooling;

[0034] (4) the hot air after secondary heat exchange enters the hot air waste heat recovery furnace through the secondary air suction port, in the hot air waste heat recovery furnace, the hot air and the water in the primary heat exchange water pipe are subjected to third heat exchange, the water after absorbing heat enters the hot water pipe and is discharged, and the cooled air enters the primary fan and is recycled;

[0035] (5) the high-temperature molten slag on the conveying belt after secondary air cooling enters the high-temperature crusher through the guide plate and is crushed, and the crushed molten slag is conveyed to the solid waste heat recovery furnace by the slag particle elevator;

[0036] (6) in the solid waste heat recovery furnace, the molten slag falls from the top of the solid waste heat recovery furnace, in the falling process of the molten slag, the molten slag and the water in the secondary heat exchange water pipe are subjected to third heat exchange, the water after absorbing the waste heat of the molten slag enters the hot water pipe and is discharged, and the cooled molten slag falls into the bottom of the solid waste heat recovery furnace and is recovered.

[0037] By combining the water mist with the multi-stage air cooling, the latent heat of the water mist vaporization is utilized, the heat recovery efficiency of the multi-stage air cooling is increased, the air consumption is reduced, and the production cost is reduced. In addition, the whole process does not produce waste water, and is more friendly to the environment.

[0038] The foregoing description of specific exemplary embodiments of the application is intended to be illustrative only and is not intended to limit the application to the precise forms described. Many modifications and variations are possible in light of the above teachings without departing from the spirit or essential characteristics of the application. The exemplary embodiments were chosen and described in order to explain the principles of the application and its practical application and to allow others skilled in the art to understand the application for various exemplary embodiments with various modifications being suited to the particular use contemplated. The scope of the application is intended to be defined by the claims and their equivalents.

Claims

1. A high-temperature molten slag heat energy recovery device using water mist air cooling, characterized in that: The application relates to a solid waste heat recovery device, which comprises a feeding mechanism, a crushing and lifting mechanism, a solid waste heat recovery furnace, a first-stage waste heat recovery mechanism, a second-stage waste heat recovery mechanism, a water mist generating mechanism, a hot air waste heat recovery furnace and a hot water pipe; the crushing and lifting mechanism is arranged between the feeding mechanism and the solid waste heat recovery furnace; the discharging end of the feeding mechanism is connected with the feeding end of the crushing and lifting mechanism; the discharging end of the crushing and lifting mechanism is connected with the feeding end of the solid waste heat recovery furnace; the hot air waste heat recovery furnace is provided with a first-stage heat exchange water pipe; the solid waste heat recovery furnace is provided with a second-stage heat exchange water pipe; the first-stage heat exchange water pipe and the second-stage heat exchange water pipe are connected with the hot water pipe; the feeding mechanism comprises a conveying unit, which is sequentially provided with the first-stage waste heat recovery mechanism and the second-stage waste heat recovery mechanism; the second-stage waste heat recovery mechanism is connected with the air inlet of the hot air waste heat recovery furnace; the first-stage waste heat recovery mechanism is connected with the air outlet of the hot air waste heat recovery furnace; the water mist generating mechanism is connected with the first-stage waste heat recovery mechanism; the water mist generating mechanism and the first-stage waste heat recovery mechanism form a first-stage sensible heat recovery; the second-stage waste heat recovery mechanism forms a second-stage sensible heat recovery; the first-stage heat exchange water pipe exchanges heat with the second-stage sensible heat recovery; and the second-stage heat exchange water pipe exchanges heat with the crushed slag to recover waste heat.

2. The high-temperature molten slag heat energy recovery device using water mist air cooling according to claim 1, characterized in that: The feeding mechanism comprises an intermediate slag tank, a hopper, a cast slag tank, a driving roller, a conveying belt and a driven roller; the cast slag tank is provided with the driving roller, the conveying belt and the driven roller; the driving roller and the driven roller are connected through the conveying belt; the driving roller, the conveying belt and the driven roller form a conveying unit; the intermediate slag tank is connected with the hopper; the hopper is arranged at the inlet of the cast slag tank; the discharging end of the hopper is located at the feeding end of the conveying belt; the discharging end of the conveying belt is provided with a guide plate; the guide plate is located at the outlet of the cast slag tank; the guide plate is connected with the crushing and lifting mechanism; the conveying belt is sequentially provided with the first-stage waste heat recovery mechanism and the second-stage waste heat recovery mechanism.

3. The high-temperature molten slag heat energy recovery device using water mist air cooling according to claim 2, characterized in that: The first-stage waste heat recovery mechanism comprises a first-stage fan, a first-stage main air duct, a first-stage branch air duct, a first-stage upper air injection port, a first-stage lower air injection port and a first-stage air suction port; the first-stage fan is connected with the air outlet of the hot air waste heat recovery furnace; the first-stage fan is connected with the first-stage main air duct; the first-stage upper air injection port and the first-stage lower air injection port are symmetrically arranged on the upper and lower sides of the conveying belt; the first-stage main air duct is connected with the corresponding first-stage upper air injection port and first-stage lower air injection port through the first-stage branch air duct; the first-stage air suction port is arranged above the first-stage upper air injection port; the first-stage air suction port is connected with the second-stage waste heat recovery mechanism; one first-stage upper air injection port corresponding to the first-stage branch air duct is connected with the water mist generating mechanism.

4. The high-temperature molten slag heat energy recovery device using water mist air cooling according to claim 3, characterized in that: The water mist generating mechanism comprises a water inlet pipe, a compressed air pipe, and an air atomizing nozzle, the water inlet pipe is connected with the compressed air pipe, the compressed air pipe is connected with an external air compressor, and the compressed air pipe is connected with the air atomizing nozzle; a first-stage branch air duct corresponding to a first-stage upper air blowing port at the front end of the conveying belt is used as an air inlet pipe, air atomizing nozzles are arranged on the air inlet pipe in a circumferential direction, the air atomizing nozzles are arranged in a spiral on the air inlet pipe, the air atomizing nozzles are arranged with their jet ends facing the inside of the air inlet pipe, the air-water mixture in the compressed air pipe is sprayed into the air inlet pipe in the form of water mist through the air atomizing nozzles, and the air in the air inlet pipe carries the water mist and sprays the water mist from the first-stage upper air blowing port at the front end of the conveying belt towards the high-temperature molten slag.

5. The high-temperature molten slag heat energy recovery device using water mist air cooling according to claim 3, characterized in that: The secondary waste heat recovery mechanism comprises a secondary fan, a secondary main air duct, a secondary branch air duct, a secondary upper air blowing port, a secondary lower air blowing port, and a secondary air suction port, the secondary fan is connected with the first-stage air suction port, the secondary fan is connected with the secondary main air duct, the secondary upper air blowing port and the secondary lower air blowing port are symmetrically arranged on the upper and lower sides of the conveying belt, the secondary main air duct is connected with the corresponding secondary upper air blowing port and secondary lower air blowing port through the secondary branch air duct, the secondary air suction port is arranged above the secondary upper air blowing port, and the secondary air suction port is connected with an air inlet of the hot air waste heat recovery furnace.

6. The high-temperature molten slag heat recovery device using water mist air cooling according to claim 2, characterized in that: The crushing and lifting mechanism comprises a high-temperature crusher and a slag particle elevator, the high-temperature crusher is arranged at the feeding end of the slag particle elevator, the high-temperature crusher is connected with a guide plate, and the discharging end of the slag particle elevator is connected with the feeding end of the solid waste heat recovery furnace.

7. A high-temperature molten slag heat energy recovery method using water mist air cooling according to any one of claims 1-6, comprising the following steps: (1) pouring the high-temperature molten slag into an intermediate slag tank, the high-temperature molten slag falls into the conveying belt in the casting slag tank through a hopper, and the driving roller drives the conveying belt to rotate to forwardly convey the high-temperature molten slag; (2) the primary fan blows normal-temperature air into the primary main air duct, the air passes through the primary branch air duct and is blown out from the corresponding first-stage upper air blowing port and first-stage lower air blowing port to air cool the high-temperature molten slag on the conveying belt; at the same time of blowing air by the primary fan, the external air compressor sends compressed air to the compressed air pipe, the compressed air is mixed with water, and the water mist is sprayed out from the air atomizing nozzle in the air inlet pipe, the air in the air inlet pipe carries the water mist and sprays the water mist from the first-stage upper air blowing port at the front end of the conveying belt, the air carrying the water mist contacts the high-temperature molten slag, and the water mist is instantaneously vaporized into high-temperature steam; (3) the secondary fan is started, the high-temperature steam and the hot air after heat exchange are discharged into the secondary main air duct through the first-stage air suction port, the hot air is blown out from the corresponding secondary upper air blowing port and secondary lower air blowing port through the secondary branch air duct to air cool the high-temperature molten slag on the conveying belt for the second time; (4) the hot air after secondary heat exchange enters the hot air waste heat recovery furnace through the secondary air suction port, the hot air and the water in the primary heat exchange water pipe are subjected to third heat exchange in the hot air waste heat recovery furnace, the water absorbs heat and then enters the hot water pipe to be discharged, and the cooled air enters the primary fan to be recycled; (5) the high-temperature molten slag on the conveying belt after secondary air cooling enters the high-temperature crusher through the guide plate to be crushed, and the crushed molten slag is conveyed to the solid waste heat recovery furnace by the slag particle elevator. (6) In the solid waste heat recovery furnace, the molten slag falls from the top of the solid waste heat recovery furnace, and in the process of falling, the molten slag and the water in the secondary heat exchange water pipe carry out the third heat exchange, and the water absorbs the waste heat of the molten slag and then enters the hot water pipe to be discharged, and the cooled molten slag falls into the bottom of the solid waste heat recovery furnace for recovery.

8. The method according to claim 7, characterized in that: In step (2), after the water mist is contacted with the high-temperature molten slag and vaporized, the high-temperature molten slag is still dry slag.

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