Smelting slag ladle waste heat recovery device

Abstract

The invention provides a smelting slag ladle waste heat recovery device which can safely and fully absorb slag ladle waste heat and comprises a tunnel kiln body and a heat exchange system, the tunnel kiln body comprises a preheating space (11) and a convection space (12), and the convection space (12) is located obliquely above the preheating space (11); the upper part of the preheating space (11) is communicated with an inlet of the convection space (12), and an outlet of the convection space (12) is communicated with the lower part of the preheating space (11) through a high-temperature fan (42) and a ventilation pipeline; the heat exchange system comprises preheating surface heat exchangers (5) and evaporation surface heat exchangers (6), and the preheating surface heat exchangers (5) are arranged on the inner walls of the left side and the right side of the preheating space (11); and the evaporation surface heat exchanger (6) is arranged in the convection space (12). Water in the preheating surface heat exchanger and the evaporation surface heat exchanger can be prevented from leaking to the slag ladle opening under extreme conditions, and the whole system is mature, stable and reliable.

Description

Technical Field

[0001] The invention relates to the technical field of waste heat recovery, and in particular to a smelting slag ladle waste heat recovery device. Background Art

[0002] As human activities intensify, global warming is changing people's lifestyles and bringing more and more problems. The more "carbon" is consumed, the more "carbon dioxide", the culprit of global warming, is produced. Therefore, in recent years, the Chinese government has continuously adopted more powerful policies and measures to fully implement the idea of ​​ecological civilization, and promote green planning, green design, green investment, green construction, green production, green circulation, green life, and green consumption in all aspects and throughout the process; national development is based on efficient use of resources, strict protection of the ecological environment, and effective control of greenhouse gas emissions, and a sound green, low-carbon, circular economic system has been established.

[0003] At present, copper slag bags and other smelting slag bags are transported to the slow cooling area after production and cooled by natural cooling. At this time, the smelting slag bags have abundant heat resources. If this part of the heat can be recycled, it can not only reduce the surrounding environmental temperature and create a green and comfortable working environment, but also solve the domestic bottleneck of the slag bag heat cannot be recovered, help achieve carbon peak, and ultimately realize a mass production model.

[0004] Taking copper slag as an example, the cooling crystallization process of copper slag is divided into two stages: the first stage is the formation of nodules; the second stage is the formation and development of grains. The thermal state and viscosity of copper slag determine the formation and growth of crystal nuclei. Therefore, in order to obtain coarser copper particles, the cooling rate must be controlled. The phase change temperature of copper slag is 1140℃-1080℃, and below 1080℃ is high-temperature solid slag. According to relevant research, the cooling rate is kept between (1-10)℃ / min, which is conducive to the aggregation and growth of copper particles. Therefore, the cooling rate must be controlled during the slag temperature above 1000℃.

[0005] When controlling the cooling speed of the slag bag, water cooling is used. However, once water leaks, it will quickly vaporize when in contact with the high-temperature molten slag, and the volume will expand rapidly, thus generating huge pressure. If the pressure exceeds the bearing capacity of the container, an explosion will occur. In addition, when the high-temperature molten slag meets water, the decomposition of water is accelerated, and the mixture of hydrogen and oxygen reaches the explosion limit, which will also cause an explosion. Therefore, strict preventive measures must be taken to ensure production safety. In view of this, it is hoped to develop a safe smelting slag bag waste heat recovery device that can fully absorb the waste heat of the slag bag. Summary of the invention

[0006] In order to solve the problems in the background technology, the present invention provides a smelting slag ladle waste heat recovery device, which can safely and fully absorb the slag ladle waste heat.

[0007] The technical solution of the present invention is: The smelting slag ladle waste heat recovery device includes a tunnel kiln body and a heat exchange system, which is characterized in that: the tunnel kiln body includes a preheating space 11 and a convection space 12, and the convection space 12 is located obliquely above the preheating space 11; the upper part of the preheating space 11 is connected to the entrance of the convection space 12, and the outlet of the convection space 12 is connected to the lower part of the preheating space 11 through a high-temperature fan 42 and a ventilation pipeline; the heat exchange system includes a preheating surface heat exchanger 5 and an evaporation surface heat exchanger 6, and the preheating surface heat exchanger 5 is arranged on the inner walls on the left and right sides of the preheating space 11; the evaporation surface heat exchanger 6 is arranged in the convection space 12.

[0008] Preferably, the heat exchange system also includes softening water equipment, a soft water pump, a deaerator, a make-up water pump, a circulating water pump and a steam drum connected in sequence, a plurality of parallel preheating surface heat exchangers 5 and a plurality of parallel evaporation surface heat exchangers 6 are connected to the circulating water pump, the outlets of the preheating surface heat exchanger 5 and the evaporation surface heat exchanger 6 are connected to the steam drum, and the water separated from the steam drum is connected to the preheating surface heat exchanger 5 and the evaporation surface heat exchanger 6 through the circulating water pump.

[0009] Preferably, the steam generated by the drum is connected to a deaerator for deoxygenation. The steam generated by the drum can also be fed into a steam pipe network for preheating of raw material warehouses and thawing warehouses within the plant area.

[0010] Preferably, the outlet of the preheating surface heat exchanger 5 is also connected to the inlet of the evaporating surface heat exchanger 6 , and the preheating surface heat exchanger 5 is equivalent to preheating the medium of the evaporating surface heat exchanger 6 .

[0011] Preferably, the hot air in the convection space 12 where one or more evaporation surface heat exchangers 6 are located at the starting end of the tunnel kiln body or the directly corresponding preheating space 11 is introduced into other convection spaces 12 in the tunnel through a circulating fan.

[0012] Preferably, the length of the slag ladle car 22 in the forward direction of the tunnel kiln body is L meters. Therefore, a preheating space 11 and a convection space 12 connected thereto are divided every L meters in the tunnel kiln body, and an outlet of the convection space 12 is set at every L meters in the forward direction of the slag ladle car. The outlets of multiple convection spaces 12 share a high-temperature fan 42, or each convection space 12 can use a high-temperature fan 42 separately.

[0013] Preferably, the tunnel kiln body is divided into 24 preheating spaces 11 and 24 convection spaces 12; the 5 preheating spaces 11 and convection spaces 12 closest to the starting end of the tunnel serve as slow cooling zones, and the outlets of the 5 convection spaces 12 share a high-temperature fan 42; the 12 preheating spaces 11 and convection spaces 12 closest to the end of the tunnel serve as low-temperature zones, and the outlets of the 12 convection spaces 12 share a high-temperature fan 42; the remaining 7 middle preheating spaces 11 and convection spaces 12 serve as high-temperature zones, and the outlets of the convection spaces 12 share a high-temperature fan 42.

[0014] Preferably, the height of the highest point of the preheating surface heat exchanger 5 is lower than the height of the highest point of the slag bag 3 when the slag bag 3 is on the track 21.

[0015] Preferably, a water baffle 13 is provided between the outlet of the preheating space 11 and the convection space 12. When an extreme situation occurs, the water baffle 13 can prevent the water in the evaporating surface heat exchanger 6 from leaking and contacting the high-temperature slag bag, ensuring that the leaked water cannot reach the slag bag mouth under any circumstances and cause safety problems.

[0016] Preferably, the hot air in the preheating space 11 can flow to the convection space 12 through the bottom of the water baffle 13 .

[0017] Preferably, in order to guide the hot air above the slag bag 3 to flow toward the convection space 12, the upper top surface of the preheating space 11 is higher at one end close to the convection space 12 than at the other end, that is, the upper top surface is an inclined surface.

[0018] Preferably, the inner wall of the tunnel kiln body adopts a three-layer insulation structure, an aluminum silicate knitted blanket close to the inner wall of the tunnel kiln body, an intermediate layer of aluminum silicate refractory blocks, and a working layer sprayed with a high-strength surface curing agent.

[0019] Preferably, the slag ladle waste heat recovery device further comprises a conveying system, wherein the conveying system comprises a track 21 arranged at the bottom of the preheating space 11 and a slag ladle vehicle 22 moving on the track for conveying the slag ladle 3 .

[0020] Preferably, a heat-insulating plate is provided on the bottom of the slag ladle car, a U-shaped groove is provided on the inner wall of the tunnel kiln body, and convex blocks are provided on both sides of the slag ladle car at positions corresponding to the U-shaped groove, and the convex blocks can be inserted into the U-shaped groove, and the gap between the two is matched to prevent the heat loss of the slag ladle. Rollers can be further provided between the convex blocks and the U-shaped groove to reduce friction.

[0021] Preferably, the conveying system further includes a shuttle bus, a propulsion mechanism, and a tractor. The propulsion mechanism is an external hydraulic jacking machine, which is used to propel the slag ladle car 22 in the kiln. Two shuttle buses are respectively arranged at the head and tail of the kiln, and are used to transfer the slag ladle car 22 from the track inside the tunnel kiln body to the return track outside the tunnel kiln body. One tractor is used to re-tow the slag ladle car 22 at the exit of the tunnel kiln body to the entrance of the tunnel kiln body. Preferably, the track is a closed loop track, which can save two shuttle buses.

[0022] The advantages of the present invention are: (1) The advantageous structural design prevents water from leaking from the preheating surface heat exchanger and the evaporation surface heat exchanger to the slag bag outlet in extreme cases. The entire system is mature, stable and reliable.

[0023] (2) The slag bag passes through the uniquely designed tunnel kiln body, and the preheating surface heat exchanger is used to quickly absorb the radiant heat, and convection can be forced to be generated. The evaporation surface heat exchanger absorbs the convection heat. The heat exchanger can form a 110℃ steam-water mixture in a short time, which can be circulated into the high-temperature zone to form 0.8Mpa, 175℃~180℃ saturated steam. The generated saturated steam is collected into the low-pressure steam pipeline network and sent to the steam turbine for power generation or directly used for heating the thawing warehouse and raw material warehouse, or used for deoxidation in the deaerator.

[0024] (3) Partitioned gradient heat exchange with high heat transfer efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figure 1 This is a schematic diagram of the overall structure of the smelting slag bag waste heat recovery device; Figure 2 This is a schematic diagram of the tunnel kiln structure; Figure 3 This is a schematic diagram of the principle of the soda system; Figure 4 is a schematic diagram of the heat exchange structure layout; Figure 5 This is a schematic diagram of the layout of a high-temperature fan pipeline shared by 7 convection spaces. DETAILED DESCRIPTION

[0026] like Figure 1 , Figure 2 , Figure 4As shown, the smelting slag ladle waste heat recovery device includes a tunnel kiln body and a heat exchange system. The tunnel kiln body includes a preheating space 11 and a convection space 12, and the convection space 12 is located obliquely above the preheating space 11; the space in which the slag ladle 3 runs in the tunnel kiln body is the preheating space 11, the upper part of the preheating space 11 is connected to the entrance of the convection space 12, and the outlet of the convection space 12 is connected to the lower part of the preheating space 11 through a high-temperature fan 42 and a ventilation pipeline, and the ventilation pipeline includes a fan front pipeline 43 and a fan rear pipeline 41, and the outlet of the convection space 12 is connected to the lower part of the preheating space 11 through the fan front pipeline 43, the high-temperature fan 42, and the fan rear pipeline 41 in sequence; the heat exchange system includes a preheating surface heat exchanger 5 and an evaporation surface heat exchanger 6, and the preheating surface heat exchanger 5 is arranged on the inner walls of the left and right sides of the preheating space 11; the evaporation surface heat exchanger 6 is arranged in the convection space 12.

[0027] like Figure 2 The tunnel kiln body is designed in a special shape, consisting of two spaces connected diagonally, and the position of the preheating surface heat exchanger 5 is not higher than the slag bag 3, to prevent water in the preheating surface heat exchanger 5 and the evaporation surface heat exchanger 6 from leaking to the slag bag mouth in extreme cases.

[0028] The main function of the heat exchange system is to realize the recovery and utilization of the waste heat of the slag bag. It adopts the skid-mounted modular design concept. All components are assembled in the factory and can be specifically configured according to customer needs. It can greatly reduce the workload on site and improve the factory quality of products, and facilitate the inspection and maintenance of equipment. Combined with the actual requirements of emergency treatment of slag bag accidents (prevention of water leakage), the heat extraction method is reasonably divided. The radiation heat generated by the slag bag 3 is recovered by the preheating surface heat exchanger 5, and the convection heat generated by the slag bag 3 is recovered by the evaporation surface heat exchanger 6. The preheating surface heat exchanger 5 adopts a membrane water-cooled wall. The water-cooled wall heat exchange surface is arranged on the inner wall of the tunnel kiln body and below the slag bag mouth for preheating water. The evaporation surface heat exchanger 6 adopts high-frequency resistance welded finned tubes. The evaporation surface heat exchanger 6 is arranged above the side of the tunnel kiln body and outside the visible range of the slag bag mouth, and the air duct forced convection is increased to recover a large amount of waste heat to generate water vapor.

[0029] like Figure 3 The heat exchange system also includes softening water equipment, a soft water pump, a deaerator, a make-up water pump, a circulating water pump and a steam drum which are connected in sequence. A plurality of parallel preheating surface heat exchangers 5 and a plurality of parallel evaporation surface heat exchangers 6 are all connected to the circulating water pump. The outlets of the preheating surface heat exchanger 5 and the evaporation surface heat exchanger 6 are connected to the steam drum. The water separated from the steam drum is connected to the preheating surface heat exchanger 5 and the evaporation surface heat exchanger 6 through the circulating water pump.

[0030] The soft water pump sends the softened water to the deaerator for thermal deoxygenation to ensure the water quality of the heat exchange system.

[0031] The main function of the deaerator is to prevent and reduce corrosion of the system feed water pipes, heat exchangers and other ancillary equipment by removing oxygen and other gases dissolved in the feed water.

[0032] The main function of the make-up water pump is to ensure that the drum liquid level is within the normal range through PID regulation, and to ensure the continuity and stability of water supply.

[0033] Softened water is circulated in the steam drum and heat exchanger through a circulating water pump, continuously absorbing the heat radiated by the slag bag.

[0034] The steam drum is a cylindrical pressure vessel used for steam-water separation and steam purification in the heat exchange system, forming a water circulation loop and storing boiler water. It has a certain heat storage capacity to moderate the speed of change of steam pressure. The steam drum is equipped with pressure gauges, water level gauges, emergency water discharge, safety valves and other equipment to ensure the safe operation of the boiler. Preferably, the steam generated by the steam drum is connected to the deaerator for deoxygenation. The steam generated by the steam drum can also be fed into the steam pipe network for preheating of raw material warehouses and thawing warehouses within the factory area.

[0035] Preferably, the outlet of the preheating surface heat exchanger 5 is also connected to the inlet of the evaporating surface heat exchanger 6 , and the preheating surface heat exchanger 5 is equivalent to preheating the medium of the evaporating surface heat exchanger 6 .

[0036] Preferably, when one or more evaporation surface heat exchangers 6 at the starting end of the tunnel kiln body exceed the load capacity, that is, the flue gas after the evaporation surface heat exchanger 6 recovers still has residual heat, the hot air in the convection space 12 where the one or more evaporation surface heat exchangers 6 are located or the directly corresponding preheating space 11 can be led to other convection spaces 12 in the tunnel for recycling, thereby greatly improving the recycling efficiency. To achieve this purpose, a circulation fan is set in the preheating space 11 and / or the convection space 12, and the wind direction of the circulation fan is consistent with the length direction of the tunnel kiln body.

[0037] The heat exchange system adopts the concept of cascade utilization of energy, and is divided into a slow cooling zone, a high temperature zone, and a low temperature zone according to the direction of the slag bag moving inside the kiln. Combined with the wind system and the water system, the waste heat can be recovered in a cascade. Preferably, a plurality of slag bag cars 22 are arranged in sequence on the track, and the length of the slag bag car 22 in the forward direction of the tunnel kiln body is L meters. Therefore, a preheating space 11 and a convection space 12 connected thereto are divided every L meters in the tunnel kiln body, and a convection space 12 outlet is set at every L meters in the forward direction of the slag bag car. Each convection space outlet uses a high-temperature fan 42 alone, or multiple convection spaces 12 outlets can share a high-temperature fan 42. For example, a total of 24 preheating spaces 11 and 24 convection spaces 12 are provided; the 5 preheating spaces 11 and convection spaces 12 closest to the starting end of the tunnel are used as slow cooling zones, and the outlets of the 5 convection spaces 12 share a high-temperature fan 42; the 12 preheating spaces 11 and convection spaces 12 closest to the end of the tunnel are used as low-temperature zones, and the outlets of the 12 convection spaces 12 share a high-temperature fan 42; the remaining 7 middle preheating spaces 11 and convection spaces 12 are used as high-temperature zones, and the outlets of the convection spaces 12 share a high-temperature fan 42, such as Figure 5 shown.

[0038] Preferably, the heat exchange system is also equipped with a quantitative dosing device to extend the cleaning cycle.

[0039] Preferably, the height of the highest point of the preheating surface heat exchanger 5 is lower than the height of the highest point of the slag bag 3 when the slag bag 3 is on the track 21.

[0040] Preferably, a water baffle 13 is provided between the outlet of the preheating space 11 and the convection space 12. When an extreme situation occurs, the water baffle 13 can prevent the water in the evaporating surface heat exchanger 6 from leaking and contacting the high-temperature slag bag, ensuring that the leaked water cannot reach the slag bag mouth under any circumstances and cause safety problems.

[0041] Since the water baffle 13 blocks part of the air flow from the preheating space 11 to the convection space 12, in order to compensate for the loss of air flow, the upper part of the side wall adjacent to the preheating space 11 and the convection space 12 and the bottom of the preheating space 11 close to the preheating space 11 are hollow structures or have no baffle design, such as Figure 2 As shown by the oblique arrows, the hot air in the preheating space 11 can flow to the convection space 12 through the bottom of the water baffle 13 .

[0042] Preferably, in order to guide the hot air above the slag bag 3 to flow toward the convection space 12, the upper top surface of the preheating space 11 is higher at one end close to the convection space 12 than at the other end, that is, the upper top surface is an inclined surface.

[0043] The normal operating temperature inside the tunnel kiln body is about 1000°C. The temperature inside the tunnel kiln body preheating space and the flue gas outlet 12 is relatively high. Considering the scouring of high-temperature flue gas, the selected refractory material has good high-temperature performance, high high-temperature strength and certain corrosion resistance; preferably, the inner wall of the tunnel kiln body adopts a three-layer insulation structure, an aluminum silicate knitted blanket close to the inner wall of the tunnel kiln body, the middle layer is an aluminum silicate refractory block, and the working layer is sprayed with a high-strength silicon-based surface curing agent.

[0044] Preferably, door bodies are installed at the entrance and exit of the tunnel kiln body, preferably high-temperature automatic doors.

[0045] Preferably, a reinforcement strip 15 is provided below the convection space 12 .

[0046] The slag ladle waste heat recovery device further comprises a conveying system, wherein the conveying system comprises a track 21 arranged at the bottom of the preheating space 11 and a slag ladle vehicle 22 moving on the track for conveying the slag ladle 3 .

[0047] Preferably, a heat-insulating plate is provided on the bottom of the slag ladle car, a U-shaped groove is provided on the inner wall of the tunnel kiln body, and convex blocks are provided on both sides of the slag ladle car at positions corresponding to the U-shaped groove, and the convex blocks can be inserted into the U-shaped groove, and the gap between the two is matched to prevent the heat loss of the slag ladle. Rollers can be further provided between the convex blocks and the U-shaped groove to reduce friction.

[0048] Preferably, the conveying system further includes a shuttle bus, a propulsion mechanism, and a tractor. The propulsion mechanism is an external hydraulic jacking machine, which is used to propel the slag ladle car 22 in the kiln. Two shuttle buses are respectively arranged at the head and tail of the kiln, and are used to transfer the slag ladle car 22 from the track inside the tunnel kiln body to the return track outside the tunnel kiln body. One tractor is used to re-tow the slag ladle car 22 at the exit of the tunnel kiln body to the entrance of the tunnel kiln body. Preferably, the track is a closed loop track, which can save two shuttle buses.

[0049] The slag ladle waste heat recovery device of the present invention is constructed between the existing slag ladle output point and the slow cooling field, and has no negative impact or interference on the original production process. Ensure that the waste heat of the slag ladle is effectively removed under the premise of safe operation. Waste heat recovery is carried out while controlling the cooling rate of the slag ladle to ensure that the cooling rate of the copper slag is maintained between (1-10)℃ / min, and the formation and development of grains in the slag ladle are effectively controlled, which is conducive to the aggregation and growth of copper particles, and the time is controllable and adjustable. At the same time, destructive tests such as water leakage and steam injection are carried out to ensure that there is no adverse effect on the cooling process of the copper slag ladle. The heat exchange system can force heat exchange or natural heat exchange, absorb radiation heat and convection heat exchange, and ensure recovery efficiency. In addition, the water volume on the water side of the system is adjustable, the steam outlet temperature and pressure are controllable, and the heat extraction can also be dynamically adjusted. The system is stable and has no safety hazards. The entire system is mature and reliable, temperature-resistant and pressure-resistant, and adaptable to work scenarios.

[0050] According to calculation, the size of the slag bag is 12³×85%=10.2m³, the running speed of the slag bag car is 4m / 25min, the number of slag bag waste heat recovery devices is 5+7+12 sets, the circulating medium water forms 175℃~180℃ saturated steam in the heat exchanger, the rated evaporation capacity is 10t / h, the system design maximum evaporation capacity is 12t / h, the rated steam pressure is 0.8Mpa, and the system design pressure is 1.6Mpa.

Claims

1. A smelting slag waste heat recovery device, comprising a tunnel kiln body and a heat exchange system, characterized in that: The tunnel kiln body comprises a preheating space (11) and a convection space (12), wherein the convection space (12) is located obliquely above the preheating space (11); the upper part of the preheating space (11) is connected to the entrance of the convection space (12), and the outlet of the convection space (12) is connected to the lower part of the preheating space (11) via a high-temperature fan (42) and a ventilation pipeline; the heat exchange system comprises a preheating surface heat exchanger (5) and an evaporation surface heat exchanger (6), wherein the preheating surface heat exchanger (5) is arranged on the inner walls on the left and right sides of the preheating space (11); and the evaporation surface heat exchanger (6) is arranged in the convection space (12).

2. The smelting slag waste heat recovery device according to claim 1 is characterized in that: A water baffle (13) is provided between the outlet of the preheating space (11) and the convection space (12).

3. The smelting slag waste heat recovery device according to claim 2 is characterized in that: The hot air in the preheating space (11) can flow to the convection space (12) through the bottom of the water baffle plate (13).

4. The smelting slag waste heat recovery device according to claim 3 is characterized in that: The height of the highest point of the preheating surface heat exchanger (5) is lower than the height of the highest point of the slag bag (3) when the slag bag (3) is on the track (21).

5. The smelting slag waste heat recovery device according to any one of claims 1 to 4, characterized in that: One end of the upper top surface of the preheating space (11) close to the convection space (12) is higher than the other end.

6. The smelting slag waste heat recovery device according to claim 5, characterized in that: The heat exchange system also includes softening water equipment, a soft water pump, a deaerator, a water supply pump, a circulating water pump and a steam drum connected in sequence; a plurality of parallel preheating surface heat exchangers (5) and a plurality of parallel evaporation surface heat exchangers (6) are all connected to the circulating water pump; outlets of the preheating surface heat exchangers (5) and the evaporation surface heat exchangers (6) are connected to the steam drum; and water separated from the steam drum is connected to the preheating surface heat exchanger (5) and the evaporation surface heat exchanger (6) via the circulating water pump.

7. The smelting slag waste heat recovery device according to claim 6, characterized in that: The outlet of the preheating surface heat exchanger (5) is also connected to the inlet of the evaporating surface heat exchanger (6), and the preheating surface heat exchanger (5) is equivalent to preheating the medium of the evaporating surface heat exchanger (6).

8. The smelting slag waste heat recovery device according to claim 7, characterized in that: Hot air from the convection space (12) where one or more evaporation surface heat exchangers (6) are located at the starting end of the tunnel kiln body or the directly corresponding preheating space (11) is led to other convection spaces (12) in the tunnel through a circulating fan.

9. The smelting slag waste heat recovery device according to claim 8, characterized in that: The length of the slag ladle car (22) in the forward direction of the tunnel kiln body is L meters, so a preheating space (11) and a convection space (12) connected thereto are divided every L meters in the tunnel kiln body, and an outlet of the convection space (12) is arranged at every L meters in the forward direction of the slag ladle car, and the outlets of the multiple convection spaces (12) share a high-temperature fan (42).

10. The smelting slag ladle waste heat recovery device according to claim 9, characterized in that: The steam generated by the drum is connected to the deaerator for deoxygenation; Or the inner wall of the tunnel kiln adopts a three-layer insulation structure, with an aluminum silicate knitted blanket close to the inner wall of the tunnel kiln, an aluminum silicate refractory block in the middle layer, and a high-strength surface curing agent sprayed on the working layer; Alternatively, the slag ladle waste heat recovery device further comprises a conveying system, the conveying system comprising a track (21) arranged at the bottom of the preheating space (11) and a slag ladle car (22) moving on the track for conveying the slag ladle (3), a thermal insulation board being arranged on the bottom surface of the slag ladle car, a U-shaped groove being arranged on the inner wall of the tunnel kiln body, and protrusions being arranged on both sides of the slag ladle car at positions corresponding to the positions of the U-shaped grooves, the protrusions being able to be inserted into the U-shaped grooves, and the two being clearance-matched.

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