Steel slag waste heat recovery furnace with multi-section rotary water-cooling shaft separator
By designing a multi-stage rotary water-cooled shaft-distance separator steel slag waste heat recovery furnace, the problem of complex structure and large area of fluidized bed heat recovery process is solved, and efficient heat recovery effect is achieved.
Patent Information
- Application Number
- CN202510154921.1
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2025-02-12
- Publication Date
- 2025-05-13
AI Technical Summary
The existing fluidized bed heat recovery process has the problem of complex structure and large area.
A multi-stage rotary water-cooled shaft is designed to distribute the separator steel slag waste heat recovery furnace, including an air-cooled sleeve, air-cooled plate, furnace, feeding port, discharge port, return valve, blower, separator, tail flue, water-cooled shaft, rotating device and heat receiving structure, and heat exchange is achieved through a multi-layer annular arrangement of water-cooled devices and rotating water-cooled shaft.
It achieves a heat recovery effect with a simple structure and a small area, with a heat recovery rate of up to 80%, and a large scope of application.
Smart Images
Figure CN119979787A_ABST
Abstract
Description
Technical Field
[0001] The invention discloses a steel slag waste heat recovery furnace with a multi-stage rotating water-cooled shaft and a separator, and belongs to the field of energy recovery and utilization. Background Art
[0002] The temperature of high-temperature steel slag is about 1450℃, and the slag is usually discharged intermittently, so it is very difficult to recycle its heat energy. The common blast furnace water quenching treatment can only recycle 10% of the heat of the slag, and the remaining 90% of the heat can only be wasted. At present, the research on dry granulation of blast furnace slag at home and abroad has entered the pilot stage, and its methods are divided into two categories: ordinary type and fluidized bed type.
[0003] Ordinary waste heat recovery. This method is to first pour the liquid blast furnace slag into an inclined slag ditch. When the liquid slag flows out at the end of the slag ditch, it contacts the high-speed air flow coming out from the bottom. The slag temperature drops from 1550℃ to 1000℃ and is granulated before entering the heat exchanger. The slag is then cooled to 300℃ in the heat exchanger and the heat is recovered. This method can recover 40%-45% of the heat. However, it is still lower than the fluidized bed method, and the slag particle size after treatment is uneven.
[0004] Fluidized bed heat recovery. The fluidized bed uses air as the fluidizing gas. During the treatment process, the steel slag particles are fully in contact with the fluidizing gas, and the contact area is increased, so the heat exchange is relatively sufficient, and the slag heat recovery rate is greatly improved. There are two types of fluidized bed recovery methods: conventional dry granulation method and molten blast furnace slag granulation method. The latter is more mature and the recovery rate can reach 70%. Its core equipment is the molten blast furnace slag granulation equipment. The heat recovery process is: the liquid blast furnace slag particles are thrown out from the cup, and through the heat exchange with the air from the lower fluidized bed and the water-cooled wall, about 14% of the heat is recovered; the blast furnace slag then hits the inner wall of the container and exchanges heat with the water-cooled wall to recover about 23% of the heat; the blast furnace slag particles rebounded from the inner wall enter the primary fluidized bed, and heat exchange and cool with the air passing through the fluidized bed and the heat exchange tubes located in the bed layer, recovering about 43% of the heat; the primary fluidized bed expands rapidly due to heat, and the hot slag enters the secondary fluidized bed, energy-saving heat exchange, and recovers about 20% of the heat.
[0005] The existing fluidized bed heat recovery process has the technical problems of complex structure and large occupied area. Summary of the invention
[0006] In order to solve the technical problems of the complex structure and large floor space of the above-mentioned fluidized bed heat recovery process, the present invention further provides a steel slag waste heat recovery furnace with a multi-stage rotating water-cooled shaft and a separator.
[0007] The technical solution of the present invention is a multi-stage rotating water-cooled shaft equipped with a separator steel slag waste heat recovery furnace, which comprises an air-cooled sleeve, an air distribution plate, a furnace, a feeding port, a discharging port, a return valve, a blower, a separator, a tail flue, a water-cooled shaft, a rotating device and a heating structure;
[0008] The furnace is surrounded by the wall of the air-cooling sleeve, the feeding port is opened on one side of the upper part of the furnace, the discharging port is opened on the bottom surface of the furnace, the inner wall of the air-cooling sleeve is connected with an air distribution plate, the air distribution plate is arranged in an oblique downward direction, and the air distribution plate is arranged in multiple layers vertically, and the bottom of the air-cooling sleeve is connected with a blower;
[0009] A flue gas outlet is provided on the top surface of the furnace, the flue gas outlet is connected to the tail flue, one end of the separator is connected to the tail flue, the return valve is connected to the lower part of the furnace, and the other end of the separator is connected to the return valve;
[0010] A water-cooled shaft is vertically installed in the middle of the furnace, a rotating device is installed at the bottom of the water-cooled shaft, the rotating device is used to drive the water-cooled shaft to rotate, the water-cooled shaft is connected to a heating structure arranged horizontally, and the heating structure is arranged in multiple layers vertically.
[0011] As another improvement of the present invention, the heating structure includes a water inlet header, a connecting pipe group and a water outlet header which are connected in sequence.
[0012] As another improvement of the present invention, the upper surface of the air distribution plate is provided with wind hoods, and a plurality of wind hoods are evenly arranged.
[0013] As another improvement of the present invention, it further comprises an economizer, wherein the economizer is arranged in the tail flue.
[0014] As another improvement of the present invention, it also includes a dust collector, which is connected to the end of the tail flue.
[0015] As another improvement of the present invention, it also includes an induced draft fan, and the induced draft fan is connected to the dust collector.
[0016] As another improvement of the present invention, the return valve is connected to the air blower.
[0017] As another improvement of the present invention, the air distribution plate and the heated structure have the same number of layers.
[0018] Beneficial effects of the present invention:
[0019] 1. The invention discloses a multi-stage rotating water-cooled shaft equipped with a separator for steel slag waste heat recovery, comprising an air-cooled sleeve, an air distribution plate, a furnace, a charging port, a discharging port, a return valve, a blower, a separator, a tail flue, a water-cooled shaft, a rotating device and a heating structure. The furnace is arranged vertically in a cylindrical shape, with a central vertical multi-stage water-cooled shaft, and a multi-layer annular water-cooling device arranged in the furnace. The water-cooled shaft serves as an inlet and outlet header for each layer of the water-cooling device, and the entire water-cooling device is slowly rotated by a transmission device installed at the bottom of the furnace. The hot flue gas in the furnace enters the separator through the upper flue gas outlet, and a small amount of lighter steel slag is separated and enters the lower part of the furnace through the return valve. The clean hot flue gas enters the tail flue, passes through the economizer, enters the dust collector, and is discharged by the induced draft fan. The hot steel slag is added from the upper part of the furnace, and is discharged from the slag discharge port at the lower part of the furnace after heat exchange through the water-cooling device layer by layer. Qualified desalted water is fed into the water-cooling device in the furnace after passing through the economizer, and is converted into hot water for use after heat exchange. The invention has a simple structure, occupies a small area, saves space and has a wide application range. BRIEF DESCRIPTION OF THE DRAWINGS
[0020] Figure 1 It is a schematic diagram of the overall structure of a steel slag waste heat recovery furnace with a multi-stage rotating water-cooled shaft and a separator according to the present invention.
[0021] Figure 2 yes Figure 1 Schematic cross-section at AA. DETAILED DESCRIPTION
[0022] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the drawings in the examples of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all embodiments obtained by ordinary technicians in this field without making creative work belong to the scope of protection of the present invention.
[0023] Specific implementation method 1: Combination Figure 1 and Figure 2 The present embodiment is described. The present embodiment is a multi-stage rotating water-cooled shaft equipped with a separator slag waste heat recovery furnace, which includes an air-cooled sleeve 2, an air distribution plate 3, a furnace 14, a feeding port 4, a discharge port 9, a return valve 13, a blower 1, a separator 5, a tail flue 6, a water-cooled shaft 11, a rotating device 12 and a heating structure;
[0024] The furnace 14 is surrounded by the wall of the air-cooling sleeve 2, the feeding port 4 is opened on one side of the upper part of the furnace 14, the discharging port 9 is opened on the bottom surface of the furnace 14, the inner wall of the air-cooling sleeve 2 is connected with an air distribution plate 3, the air distribution plate 3 is arranged in an oblique downward direction, and the air distribution plate 3 is vertically arranged in multiple layers, and the bottom of the air-cooling sleeve 2 is connected with a blower 1;
[0025] A flue gas outlet is provided on the top surface of the furnace 14, and the flue gas outlet is connected to the tail flue 6, one end of the separator 5 is connected to the tail flue 6, a return valve 13 is connected to the lower part of the furnace 14, and the other end of the separator 5 is connected to the return valve 13;
[0026] A water-cooled shaft 11 is vertically installed in the middle of the furnace 14, and a rotating device 12 is installed at the bottom of the water-cooled shaft 11. The rotating device 12 is used to drive the water-cooled shaft 11 to rotate. The water-cooled shaft 11 is connected to a heating structure arranged horizontally, and the heating structure is arranged in multiple layers vertically.
[0027] The high-temperature slag is fed into the furnace 14 through the feeding port 4, and enters the fluidized state under the action of the blower 1 in the air hood of the air distribution plate 3. After a part of the hot slag rises and passes through the separator 5, the light hot slag enters the tail flue 6 with the hot flue gas. The high-temperature flue gas containing some light slag passes through the economizer 10 and the dust collector 7, and the clean flue gas is discharged. The heavy hot slag returns to the furnace 14 through the return valve 13, cools, and is discharged through the discharge port 9.
[0028] The high-temperature slag is added from the charging port 4 arranged at the upper part of the furnace 14, and descends layer by layer under the action of the wind guide wind arranged on the air distribution plate 3. The air distribution plate 3 is arranged in a zigzag shape along an oblique downward direction, during which the high-temperature slag exchanges heat with the heating structure on the slowly rotating water-cooled shaft. The high-temperature slag becomes cold slag when it falls from the upper part of the furnace into the bottom furnace in a zigzag shape and is discharged.
[0029] The wind is sent into the air cooling sleeve 2 by the high-pressure blower 1, and the air cooling sleeve distributes the wind to each layer of the air distribution plate 3, and the steel slag is blown by the loose wind, and the cold wind and the hot steel slag are heat exchanged at the same time. The hot wind with a small amount of steel slag enters the separator 5, and the high-temperature flue gas enters the tail flue 6 and is discharged. This embodiment has a simple structure, small footprint, space saving, and a wide range of applications. The temperature of high-temperature steel slag is about 1450 degrees, and the slag is usually discharged intermittently, so the recovery and utilization of its heat energy is very difficult. After the common blast furnace water quenching treatment, only 10% of the heat of the slag can be recovered, and the remaining 90% of the heat can only be wasted. The multi-stage rotating water-cooled shaft equipped with a separator steel slag waste heat recovery furnace system provided in this embodiment has a multi-stage water cooling device arranged in the furnace, and the annular water-cooling pipes of each layer rotate with the water-cooling shaft. The steel slag particles descend layer by layer and contact the annular water-cooling pipes fully, and the contact area is increased, so the heat exchange is relatively sufficient, and the tail performs convection heat exchange, and the slag heat recovery rate is greatly improved, and the recovery rate can reach 80%.
[0030] Specific implementation method 2: Combination Figure 1 and Figure 2This embodiment is described. The difference between this embodiment and the first embodiment is that the heating structure includes an inlet header 17, a connecting pipe group 16 and an outlet header 15 connected in sequence. Qualified feed water is heated by the economizer 10 and fed to the bottom water-cooled shaft 11. After the water-cooled shaft 11 rises, it enters the inlet header 17 and is distributed to each heat-receiving tube of the connecting pipe group 16. After absorbing heat, it reaches the outlet header 15, and the outlet header 15 is connected to the water-cooled shaft of the upper layer. According to this process, it reaches the top water-cooled shaft and then is discharged from the boiler. Other components and connection methods are the same as those of the first embodiment.
[0031] Specific implementation method three: Combination Figure 1 and Figure 2 This embodiment is described. The difference between this embodiment and the first embodiment is that a hood is provided on the upper surface of the air distribution plate 3, and several hoods are evenly arranged. The air is sent into the air cooling sleeve 2 by the high-pressure blower 1, and the air cooling sleeve distributes the air to each layer of the air distribution plate 3. The hood acts as the loosening wind of the slag to blow the slag. At the same time, the cold air and the hot slag exchange heat. The hot air with a small amount of slag enters the separator 5, and a very small part of the high-temperature flue gas enters the tail flue 6. The other components and connection methods are the same as those of the first or second embodiment.
[0032] Specific implementation method four: Combination Figure 1 and Figure 2 This embodiment is described. This embodiment is different from the first embodiment in that it further includes an economizer 10, and the economizer 10 is arranged in the tail flue 6. Other components and connection methods are the same as any one of the first to third embodiments.
[0033] Specific implementation method five: Combination Figure 1 and Figure 2 This embodiment is described. The difference between this embodiment and the specific embodiment 1 is that it also includes a dust collector 7, which is connected to the end of the tail flue 6. The wind is sent into the air cooling sleeve 2 by the high-pressure blower 1, and the air cooling sleeve distributes the wind to each layer of the air distribution plate 3. The ventilating cap blows the steel slag as the loosening wind of the steel slag. At the same time, the cold wind and the hot steel slag exchange heat. The hot air with a small amount of steel slag enters the separator 5, and a very small part of the fine steel slag and the high-temperature flue gas enter the tail flue 6 economizer 10 for heat exchange. After the low-temperature flue gas passes through the dust collector 7, the clean low-temperature smoke is discharged. The other components and connection methods are the same as any one of the specific embodiments 1 to 4.
[0034] Specific implementation method six: Combination Figure 1 and Figure 2 This embodiment is described. This embodiment is different from the first embodiment in that it further includes an induced draft fan 8, which is connected to a dust collector 7. Clean low-temperature smoke is discharged through the dust collector 7. Other components and connection methods are the same as any one of the first to fifth embodiments.
[0035] Specific implementation method seven: Combination Figure 1 and Figure 2 This embodiment is described. The difference between this embodiment and the first embodiment is that the return valve 13 is connected to the blower 1. The heavy hot slag returns to the furnace 14 through the return valve 13 and is discharged through the discharge port 9 after cooling. The delivery efficiency of the hot slag is improved by providing the blower 1. The other components and connection methods are the same as any one of the first to sixth embodiments.
[0036] Specific implementation method eight: Combination Figure 1 and Figure 2 This embodiment is described. The difference between this embodiment and the first embodiment is that the number of layers of the air distribution plate 3 and the heating structure is the same. The other components and connection methods are the same as any one of the first to seventh embodiments.
[0037] Combination Figure 1 and Figure 2 The working principle of the present invention is described:
[0038] The high-temperature slag is added from the charging port 4 arranged at the upper part of the furnace 14, and descends layer by layer under the action of the wind guide wind arranged on the air distribution plate 3. The multiple layers of air distribution plates 3 are arranged in a zigzag shape, during which the high-temperature slag exchanges heat with the slowly rotating water-cooled shaft heating surface. The high-temperature slag becomes cold slag when it falls from the upper part of the furnace into the bottom furnace in a zigzag shape and is discharged.
[0039] After being heated by the economizer 10, the qualified feed water is fed to the bottom water-cooled shaft 11, and then rises through the water-cooled shaft 11 and enters the water inlet header 17, and is distributed to each heat-receiving tube of the connecting pipe group 16, and then absorbs heat and enters the water outlet header 15, which is connected to the water-cooled shaft of the upper layer. This process is followed to the top water-cooled shaft and then discharged from the boiler.
[0040] The wind is sent into the air cooling sleeve 2 by the high-pressure blower 1, and the air cooling sleeve distributes the wind to each layer of air distribution plates 3. The ventilation hood acts as the loosening wind for the slag to blow the slag. At the same time, the cold wind exchanges heat with the hot slag. The hot air with a small amount of slag enters the separator 5, and a small amount of fine slag and high-temperature flue gas enter the tail flue 6 economizer 10. After heat exchange, the low-temperature flue gas passes through the dust collector 7, and the clean low-temperature smoke is discharged through the induced draft fan 8.
[0041] The above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit the same. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that the technical solutions described in the aforementioned embodiments may still be modified, or some of the technical features may be replaced by equivalents. However, these modifications or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions of the embodiments of the present invention.
Claims
1. A multi-stage rotating water-cooled shaft equipped with a separator slag waste heat recovery furnace, characterized in that It comprises an air-cooling sleeve (2), an air distribution plate (3), a furnace (14), a charging port (4), a discharging port (9), a return valve (13), a blower (1), a separator (5), a tail flue (6), a water-cooling shaft (11), a rotating device (12) and a heating structure; The furnace (14) is surrounded by the wall of the air-cooling sleeve (2); the feeding port (4) is provided on one side of the upper part of the furnace (14); the discharging port (9) is provided on the bottom surface of the furnace (14); the inner wall of the air-cooling sleeve (2) is connected with an air distribution plate (3); the air distribution plate (3) is arranged in an oblique downward direction; the air distribution plate (3) is vertically arranged in multiple layers; the bottom of the air-cooling sleeve (2) is connected with an air blower (1); A smoke outlet is provided on the top surface of the furnace (14), the smoke outlet is connected to the tail flue (6), one end of the separator (5) is connected to the tail flue (6), a return valve (13) is connected to the lower part of the furnace (14), and the other end of the separator (5) is connected to the return valve (13); A water-cooling shaft (11) is vertically installed in the middle of the furnace (14), a rotating device (12) is installed at the bottom of the water-cooling shaft (11), and the rotating device (12) is used to drive the water-cooling shaft (11) to rotate. The water-cooling shaft (11) is connected to a heating structure arranged in the transverse direction, and the heating structure is arranged in multiple layers in the vertical direction.
2. The multi-stage rotating water-cooled shaft separator steel slag waste heat recovery furnace according to claim 1, characterized in that: The heating structure comprises a water inlet header (17), a connecting pipe group (16) and a water outlet header (15) which are connected in sequence.
3. The multi-stage rotating water-cooled shaft separator steel slag waste heat recovery furnace according to claim 1, characterized in that: The upper surface of the air distribution plate (3) is provided with wind hoods, and a plurality of wind hoods are evenly arranged.
4. The multi-stage rotating water-cooled shaft separator steel slag waste heat recovery furnace according to claim 1, characterized in that It also includes an economizer (10), which is arranged in the tail duct (6).
5. The multi-stage rotating water-cooled shaft separator steel slag waste heat recovery furnace according to claim 1, characterized in that It also includes a dust collector (7), which is connected to the end of the tail flue (6).
6. The multi-stage rotating water-cooled shaft separator steel slag waste heat recovery furnace according to claim 5, characterized in that It also includes an induced draft fan (8), which is connected to the dust collector (7).
7. The multi-stage rotary water-cooled shaft separator steel slag waste heat recovery furnace according to claim 1, characterized in that: The return valve (13) is connected to the air blower (1).
8. A multi-stage rotary water-cooled shaft separator steel slag waste heat recovery furnace according to any one of claims 1 to 7, characterized in that: The number of layers of the air distribution plate (3) and the heated structure is the same.