CN116904672A - Blast furnace slag waste heat recycling system and process - Google Patents

Abstract

The application relates to the technical field of blast furnace slag waste heat recovery, in particular to a blast furnace slag waste heat recovery and utilization process, which comprises the steps of recovering heat of blast furnace slag through air flow, filtering the air flow, and introducing the filtered air flow into a hot blast stove for being used in the air supply process of the hot blast stove. The application has the effect of improving the utilization efficiency of the waste heat of the blast furnace slag.

Description

Blast furnace slag waste heat recycling system and process

Technical Field

The application relates to the technical field of blast furnace slag waste heat recovery, in particular to a blast furnace slag waste heat recovery and utilization system and a process.

Background

The blast furnace slag is waste generated in the steel smelting process, and the temperature during slag tapping can reach 1450 ℃, so that the blast furnace slag has more heat energy carried in, and has larger waste heat recovery value. The consumption of fossil energy can be reduced and the carbon emission can be reduced by recovering heat in the blast furnace slag. There are various treatment methods for waste heat recovery of blast furnace slag, including wet treatment and dry treatment, and since the dry treatment can save water resources and has higher waste heat recovery rate compared with the wet treatment, the formed by-products have higher utilization value, and the dry treatment method generally requires granulating blast furnace slag, recovering heat by air, and then utilizing high-temperature air.

The utility model discloses a slag granulation waste heat recovery heat transfer system in the related art, including the granulation unit that is used for carrying out granulation processing to liquid slag, be provided with air film cooling device in the granulation unit, the below of granulation unit is provided with the moving bed unit, and the moving bed unit is provided with multistage heat exchange surface, and the top of granulation unit is connected with waste heat recovery unit through hot-blast collection flue, and waste heat recovery unit includes waste heat boiler, and waste heat boiler can be used for turbo generator's electricity generation to accomplish the waste heat utilization to blast furnace slag.

However, the above structure is not efficient in utilizing the hot air obtained by recovering the waste heat.

Disclosure of Invention

The application provides a blast furnace slag waste heat recycling system and a process for improving the waste heat utilization efficiency of blast furnace slag.

The application provides a blast furnace slag waste heat recycling process, which adopts the following technical scheme:

a process for recovering and utilizing the afterheat of blast furnace slag includes such steps as recovering the heat of blast furnace slag, filtering, and introducing the filtered air to hot air furnace for blowing.

By adopting the technical scheme, when the blast furnace slag heat recovery device is used, the maximum temperature of the air flow can reach 900 ℃, so that the heat recovery device is difficult to recover when the air flow passes through other utilization devices, and the service life of the utilization devices is influenced due to the fact that the utilization devices are at 900 ℃ on one hand, and the heat transfer with the outside is faster on the other hand, so that the loss is caused; the air flow is directly introduced into the hot blast stove, the heat in the hot blast stove is taken away by the air flow, and meanwhile, the hot blast stove is increased upwards from the highest temperature of the air flow, so that the air outlet temperature of the blast furnace needs to exceed 1200 ℃ in the air supply process of the blast furnace, the amount of cold air required to be introduced into the hot blast stove can be reduced when the waste heat recovered in the slag of the blast furnace is used for entering the hot blast stove, the heat of the high-temperature air flow obtained by the waste heat can be fully used for the hot blast stove, and the utilization efficiency of the waste heat is improved.

The application also provides a blast furnace slag waste heat recycling system, which adopts the following technical scheme:

the blast furnace slag waste heat recycling system comprises a dust remover and a hot blast stove, wherein an air inlet of the dust remover is used for being connected with an air outlet of a granulating unit, and air flow in the dust remover is used for being introduced into the hot blast stove after being filtered.

Through adopting above-mentioned technical scheme, during the use, because the temperature in the hot-blast furnace is higher, and the gas through the hot-blast furnace needs to contain less impurity, consequently, carry out heat recovery after the air current earlier through the granulation unit, the air current temperature that flows from the granulation unit is very high, but because dust in the granulation unit can remove along with the air current of high temperature, thereby can't directly be used for the hot-blast furnace, consequently also filter the back to the air current of high temperature through the dust remover, let in the hot-blast furnace again, make the waste heat that retrieves in the blast furnace slag be used for entering into in can reduce the cold air that the hot-blast furnace needs to get into, and then can make the heat of the high temperature air current that the waste heat obtained all be used for the hot-blast furnace, improve the utilization efficiency of surplus heat.

Preferably, the dust remover comprises a shell and an inner barrel, wherein the shell is vertically arranged, the lower end of the shell is provided with a relevant fan, the inner barrel is vertically arranged at the central position of the shell, air flow enters into an annular air cavity between the shell and the inner barrel from the upper part of the shell along the tangential direction of the shell, the upper end of the inner barrel extends out of the shell and is used for connecting a hot blast stove, and an oil outlet device for dripping oil on the inner wall of the shell and a scraping device for cleaning oil sludge on the inner wall of the inner barrel are arranged on the inner barrel.

Through adopting above-mentioned technical scheme, get into the air current in the shell, the air current is rotatory in annular wind intracavity, makes great impurity be close to the inner wall of shell, and the air current flows into the inner tube again, and the less impurity that contains in the air current simultaneously is with the oil film contact by oil outlet device drip leakage on the inner tube inner wall, makes less impurity in the air current obtain the clearance to clear up the fatlute that is formed by oil and less impurity through scraping device.

Preferably, the scraping device comprises a helical blade, an intermediate shaft and a supporting frame, wherein the intermediate shaft is rotatably arranged at the center position of the inner cylinder through the supporting frame, the helical blade is fixed on the outer wall of the intermediate shaft, and the edge of the helical blade is in clearance fit with the inner wall of the inner cylinder.

Through adopting above-mentioned technical scheme, helical blade's edge and the inner wall clearance fit of inner tube can make helical blade spread oil when the oil drop that drips through the oil extraction device forms the oil film to less impurity in the air current more glues on oil more easily, and helical blade can make the air current rotation attach less impurity on the oil film more simultaneously, and helical blade can scrape the oil film with the fatlute that less impurity formed from the inner tube in the in-process of motion simultaneously, and then clear up the inner wall of inner tube, keep the less impurity in the continuity adsorption air current.

Preferably, a plurality of air holes are formed in the side wall of the lower end of the inner cylinder, and the air holes are arranged at intervals with the lower end of the inner cylinder.

Through adopting above-mentioned technical scheme, the wind hole is seted up to the lower extreme of inner tube, makes the air current enter into the inner tube from the position of wind hole in, and the fatlute that takes off on the inner tube can remove the below of wind hole along the inner wall of inner tube to the fatlute falls from the below of inner tube, reduces to receive the influence of air current to enter into the inner tube again.

Preferably, the upper end of shell is provided with drive arrangement, drive arrangement includes interior mounting bracket, swivel becket and actuating vane, interior mounting bracket is fixed on the outer wall of inner tube, the swivel becket rotates to be connected on the mounting bracket, actuating vane sets up along the radial direction of swivel becket, actuating vane is co-altitude with the position that the air current got into on the shell, swivel becket passes through connecting rod fixed connection with the center pin, and the connecting rod is located the outside of inner tube and is in the shell.

Through adopting above-mentioned technical scheme, interior mounting bracket is fixed on the outer wall of inner tube, rotates through the swivel becket and connects including on the mounting bracket, makes driving vane drive swivel becket can place, when again with swivel becket and center pin fixed connection, makes driving vane can drive the center pin and rotate, makes helical vane's drive more convenient.

Preferably, the inner cylinder comprises an inner layer and an outer layer, the inner layer and the outer layer are sleeved and connected, a cooling cavity is formed between the inner layer and the outer layer, and the cooling cavity is connected with a cooling device.

Through adopting above-mentioned technical scheme, inlayer and outer cover are established and are connected and form the cooling chamber between inlayer and skin, when cooling down the intracavity through heat sink, make the temperature of the oil film that adheres to on the inlayer inner wall reduce, reduce because of the loss that oil film temperature risees and cause, influence the adhesion to less impurity.

Preferably, the heat sink includes box, steam advance pipe, steam exit tube and delivery pump, be provided with heat exchange assembly in the box, steam advances pipe one end and is connected with the box, and the other end enters into the cooling chamber from the top of inner tube and extends to the lower extreme of inner tube, steam exit tube is connected in the top of inner tube, and steam exit tube and steam advance the pipe and are connected with the opposite lateral wall of box respectively to through heat exchange assembly to entering into the steam cooling in the box, the delivery pump is installed on steam advance the pipe.

Through adopting above-mentioned technical scheme, be provided with heat exchange assembly in the box, advance pipe and steam exit tube and box intercommunication through steam, in leading to the cooling chamber with steam under the effect of delivery pump, make the inner tube cool down under the effect of steam, the rethread heat exchange assembly cools down steam, and then makes the inner wall temperature of inner tube keep at operable scope.

Preferably, the heat exchange assembly comprises a plurality of heat exchange plates, the plurality of heat exchange plates are sequentially stacked from top to bottom, the heat exchange plates are U-shaped, the adjacent two heat exchange plate layers are rotated by 90 degrees when stacked, the box body is further connected with a heat exchange inlet pipe and a heat exchange outlet pipe, the heat exchange inlet pipe and the heat exchange outlet pipe are arranged on opposite side walls of the box body, a communication groove is formed in each of four side walls of the box body, and the steam inlet pipe, the steam outlet pipe, the heat exchange inlet pipe and the heat exchange outlet pipe are all communicated with the communication groove.

Through adopting above-mentioned technical scheme, a plurality of heat transfer board laminating sets up, and two adjacent heat transfer boards rotate 90 degrees and place, make the air current that forms between heat exchange advance pipe and the heat transfer exit tube and steam advance the air current that forms between pipe and the steam exit tube and stagger 90 degrees and shunt to carry out the heat transfer, the heat transfer board can install more conveniently in the box simultaneously and advance pipe, steam exit tube, heat transfer advance pipe and heat transfer exit tube through the intercommunication groove and be connected.

Preferably, the top of box is provided with the lid, the lid is fixed on the box to the middle part of lid is provided with the compression subassembly, the compression subassembly includes pressure disk and screw rod, screw rod threaded connection is on the lid, screw rod one end inserts the lid inboard and with pressure disk fixed connection, the pressure disk is used for the butt on the heat exchange plate of top.

Through adopting above-mentioned technical scheme, the middle part of lid is provided with the screw rod, and screw rod and lid threaded connection are fixed on the pressure disk in the one end that the screw rod inserted into the lid, and after installing the lid on the box, the rethread screw rod makes the mutual extrusion between two adjacent heat exchanger plates, reduces the air current mutual float between the heat exchanger plate.

In summary, the present application includes at least one of the following beneficial technical effects:

1. the temperature of the air flow can reach 900 ℃ by recycling the heat of the blast furnace slag, so that the recycling heat utilization rate is difficult to be higher when the air flow passes through other utilization equipment, and the service life of the utilization equipment is influenced due to the fact that the utilized equipment is at 900 ℃, and the heat transfer with the outside is faster, so that the loss is caused; the air flow is directly introduced into the hot blast stove, heat in the hot blast stove is less taken away by the air flow, and meanwhile, the hot blast stove is increased upwards from the highest temperature of the air flow to be used for carrying out a blast furnace, so that the amount of cold air required to be introduced into the hot blast stove can be reduced when waste heat recovered in blast furnace slag is used for being introduced into the hot blast stove, and the heat of high-temperature air flow obtained by the waste heat can be fully used for the hot blast stove, so that the utilization efficiency of the waste heat is improved;

2. the air flow rotates in the annular air cavity, so that larger impurities are close to the inner wall of the shell, the air flow flows into the inner cylinder again, and meanwhile, smaller impurities contained in the air flow are contacted with an oil film which is dripped on the inner wall of the inner cylinder by the oil outlet device, so that the smaller impurities in the air flow are cleaned;

3. when the cooling device cools the cooling cavity, the temperature of the oil film attached to the inner wall of the inner layer is reduced, the loss caused by the increase of the oil film temperature is reduced, and the adhesion of smaller impurities is affected.

Drawings

FIG. 1 is a schematic overall structure of an embodiment of the present application;

FIG. 2 is a schematic view of the dust collector with the outer casing and inner barrel broken away in accordance with an embodiment of the present application;

FIG. 3 is a schematic view of a dust collector with the outer and inner cylinders omitted;

FIG. 4 is a schematic view of the inner barrel according to an embodiment of the present application;

FIG. 5 is a schematic view of a cooling device according to an embodiment of the application

Fig. 6 is a schematic structural view of a heat exchange plate according to an embodiment of the present application.

Reference numerals illustrate: 1. a dust remover; 11. a wind chamber; 12. a wind hole; 2. hot blast stove; 3. an air inlet pipe; 4. a housing; 41. an air seal; 5. an inner cylinder; 51. an inner layer; 52. an outer layer; 53. a cooling chamber; 6. an oil outlet device; 61. an oil outlet nozzle; 62. a grommet; 63. a main oil pipe; 64. an oil storage tank; 7. a scraping device; 71. a helical blade; 72. an intermediate shaft; 73. a support frame; 8. a driving device; 81. an inner mounting rack; 82. a rotating ring; 83. a driving blade; 84. a connecting rod; 9. a cooling device; 91. a case; 911. a communication groove; 912. a cover body; 92. a steam inlet pipe; 93. a steam outlet pipe; 94. a transfer pump; 95. a heat exchange assembly; 951. a heat exchange plate; 96. heat exchanging inlet pipe; 97. a heat exchange outlet pipe; 98. a compression assembly; 981. a pressure plate; 982. a screw; 99. a heat dissipation plate; 991. and a through hole.

Detailed Description

The application is described in further detail below with reference to fig. 1-6.

The embodiment of the application discloses a blast furnace slag waste heat recycling system, referring to fig. 1, the blast furnace slag waste heat recycling system comprises a dust remover 1 and a hot blast furnace 2, wherein an air inlet of the dust remover 1 is used for being connected with an air outlet of a granulating unit, an air inlet pipe 3 is connected to the hot blast furnace 2, and the air inlet pipe 3 is connected with the air outlet of the dust remover 1, so that hot air purified by the dust remover 1 can directly enter the hot blast furnace 2, and therefore, the heat consumed by the hot blast furnace 2 when the hot air is heated to more than 1400 ℃ is less, and the temperature of the hot air obtained by the primary dust remover 1 can still be kept at 700-800 ℃, so that the quantity of cold air entering the hot blast furnace 2 to below 300 ℃ is reduced, the utilization efficiency of the hot air can be improved, and the waste heat recycling rate of the blast furnace slag can be improved.

Referring to fig. 2, the dust remover 1 comprises a shell 4 and an inner cylinder 5, wherein the shell 4 is vertically arranged, and a heat-resistant heat-insulating material can be arranged on the inner wall of the shell 4. The lower part of the housing 4 is provided in a cone shape and is mounted with a damper 41. The air intake of dust remover 1 sets up in the top position of shell 4 and enters into shell 4 along the tangential direction of shell 4, inner tube 5 sets up at the center and the vertical setting of shell 4, leave annular wind chamber 11 between the outer wall of inner tube 5 and the inner wall of shell 4, the air current in wind chamber 11 can be along the outer wall circumference rotation of inner tube 5 make the great granule that mingles in the air current lie in the outside of wind chamber 11, the air current is less to obtain once filtration when reentrant inner tube 5, the air current enters into inner tube 5 from the lower part of inner tube 5, move upwards along inner tube 5 again, be connected with oil outlet device 6 on inner tube 5, oil outlet device 6 is used for oiling on the inner wall of inner tube 5, oil can adopt waste oil and higher firing point or adopt high temperature resistant silicone oil, make the inner wall of inner tube 5 cover one deck, when the center of inner tube 5 has the air current to pass through, for the less granule in the air current, bond the surface at the oil film. Meanwhile, a scraping device 7 is further arranged in the center of the inner barrel 5, and oil sludge can be formed after small particles are adhered to the surface of an oil film, so that the oil sludge can be cleaned through the scraping device 7.

Referring to fig. 2, the scraping device 7 includes a spiral blade 71, an intermediate shaft 72, and a supporting frame 73, the supporting frame 73 is fixed in the housing 4 below the inner cylinder 5 to reduce the influence of the supporting frame 73 on the air flow, the center of the supporting frame 73 is opposite to the center of the inner cylinder 5, and larger impurity particles collected at the lower portion of the housing 4 can also flow down to the air shutter 41 through the supporting frame 73 and be released by opening of the air shutter 41. The jackshaft 72 is vertical to be set up and the lower extreme gyration of jackshaft 72 is supported on support frame 73, and helical blade 71 is fixed on the outer wall of jackshaft 72 and helical blade 71's outward flange and the inner wall cooperation of inner tube 5, and helical blade 71's rotation direction is the direction of carrying the oil sludge on the inner tube 5 downwards. The gap between the edge of the spiral blade 71 and the inner wall of the inner cylinder 5 is used for spreading an oil film, when the oil outlet device 6 discharges oil along the inner wall of the inner cylinder 5 in a dripping manner, the spiral blade 71 can spread oil drops, smaller dust particles are adhered to the surface of the oil film, when the oil film passes by the spiral blade 71 again, dust on the surface of the oil film can be scraped off by the spiral blade 71 due to the increased thickness, and because the space between two adjacent circles of the spiral blade 71 is used for passing through the air flow, the air flow rotates along the spiral direction after entering the position of the spiral blade 71, and meanwhile, the air flow moves along the circumferential direction in the spiral rotation process, so that each part of the air flow can be more easily contacted with the oil film, and smaller impurities in the air flow are remained on the surface of the oil film. When the spiral blade 71 rotates, impurities on the oil film can be scraped off from the oil film, and a proper oil film thickness can be reserved under the control of a gap between the inner cylinder 5 and the edge of the spiral blade 71, so that the spiral blade 71 and the inner cylinder 5 have a lubricating effect. A plurality of air holes 12 may be provided in the lower side wall of the inner tube 5, and the air holes 12 are spaced apart from the lower end of the inner tube 5. The position of the wind hole 12 is used for enabling air flow to enter the wind barrel from the wind hole 12, and the spiral blade 71 can move to the lower end of the inner barrel 5 to directly fall to the bottom of the shell 4 after scraping oil sludge.

Referring to fig. 3 and 4, a driving device 8 is provided at the upper end of the housing 4, the driving device 8 includes an inner mounting frame 81, a rotating ring 82 and driving blades 83, the inner mounting frame 81 is fixed on the outer wall of the inner cylinder 5, the rotating ring 82 is rotatably provided on the outer wall of the inner mounting frame 81, the driving blades 83 are provided along the radial direction of the rotating ring 82, and a plurality of driving blades are uniformly arranged on the outer wall circumference of the rotating ring 82. When the air flow enters the inside of the outer shell 4 along the radial direction of the outer shell 4, the air flow can drive the rotating ring 82 to rotate, a plurality of connecting rods 84 are fixedly installed on the rotating ring 82, the connecting rods 84 extend downwards against the outer wall of the inner cylinder 5, and are fixedly connected with the intermediate shaft 72 at the lower end of the inner cylinder 5. When the rotating ring 82 is driven by the airflow, the rotating ring 82 can drive the intermediate shaft 72 through the connecting rod 84, so that the intermediate shaft 72 is easy to drive, and the sealing problem caused by the fact that the intermediate shaft 72 penetrates out of the inner cylinder 5 is reduced.

Referring to fig. 2 and 3, the inner cylinder 5 comprises an inner layer 51 and an outer layer 52, the inner layer 51 and the outer layer 52 are sleeved and connected, a cooling cavity 53 is formed between the inner layer 51 and the outer layer 52 at intervals, the cooling cavity 53 is annularly arranged, a cooling device 9 is connected in the cooling cavity 53, and the temperature in the cooling cavity 53 is controlled to be 250-350 ℃ through the cooling device 9. The inner layer 51 is made of a heat conducting material, the outer layer 52 is made of a heat insulating material, and the temperature of an oil film can be reduced by heat exchange of the cooling cavity 53 on the inner wall of the inner layer 51 so as to reduce the loss of the oil due to high temperature. The inner mount 81 is secured to the outer wall of the outer layer 52 to reduce wear of the outer layer 52 by the swivel ring 82.

Referring to fig. 3, the oil discharging device 6 includes a nipple 61, a collar 62, a main oil pipe 63, and an oil reservoir 64, the main oil pipe 63 being connected to the oil reservoir 64 by a pump, and the main oil pipe 63 being introduced into the lower portion of the inner tube 5 from a position between the inner layer 51 and the outer layer 52. The annular pipes 62 are arranged in sequence from top to bottom, and the annular pipes 62 are communicated with the main oil pipe 63 so that the main oil pipe 63 can supply oil to the annular pipes 62. The oil outlet nozzle 61 is mounted on the collar 62, and the oil outlet nozzle 61 penetrates from the outer wall of the inner layer 51 to the inner wall of the inner layer 51, and the end of the oil outlet nozzle 61 is flush with the inner wall of the inner layer 51, so that oil can flow along the inner wall of the inner layer 51 when the oil outlet nozzle 61 performs oil drip. And simultaneously, the main oil pipe 63, the annular pipe 62 and the oil outlet nozzle 61 are positioned in the cooling cavity 53, so that the temperature of oil is reduced.

Referring to fig. 3 and 5, the cooling device 9 includes a case 91, a steam inlet pipe 92, a steam outlet pipe 93, and a transfer pump 94. The heat exchange assembly 95 that sets up in the box 91, delivery pump 94 installs on steam advances pipe 92, makes steam advance pipe 92 insert cooling chamber 53 by the upper end of inner tube 5 in to downwardly extending to cooling chamber 53's bottom, makes steam advance pipe 92 enter into steam and cools down inner tube 5's lower part earlier, and steam exit tube 93 one end is connected to on the box 91, and the other end is connected to inner tube 5's top and cooling chamber 53 intercommunication, makes the steam that lets in cooling chamber 53 follow the bottom and upwards remove cooling inner tube 5's inner wall. After the steam is warmed up by heat absorption, the steam enters the case 91 through the steam outlet pipe 93. A heat exchange assembly 95 is arranged in the box 91, and steam is cooled in the box 91 through the heat exchange assembly 95. The ends of the steam inlet pipe 92 and the steam outlet pipe 93 connected to the cabinet 91 are located on opposite side walls of the cabinet 91. While the collar 62 is provided with a C-shape so that notches at the positions of both ends of the collar 62 can be used for placing the steam inlet pipe 92.

Referring to fig. 5 and 6, the heat exchange assembly 95 includes a plurality of heat exchange plates 951, the heat exchange plates 951 are disposed in a U shape, and the plurality of heat exchange plates 951 are sequentially stacked in a vertical direction, and a gap is left between two adjacent heat exchange plates 951 for passing an air flow due to the U shape of the heat exchange plates 951. A heat exchange inlet pipe 96 and a heat exchange outlet pipe 97 are also arranged on the side wall of the box 91, and the heat exchange inlet pipe 96 and the heat exchange outlet pipe 97 can be used for connecting other equipment using hot gas, such as a boiler. The heat exchange inlet pipe 96 and the heat exchange outlet pipe 97 are oppositely arranged on the side wall of the box body 91 and are vertically arranged on the side wall of the box body 91 connected with the steam inlet pipe 92. The heat exchange plates 951 are projected to be square from top to bottom, and two adjacent heat exchange plates 951 are rotated by 90 degrees in the process of stacking up and down, so that air flows between the two adjacent heat exchange plates 951 pass through different directions respectively. The tank 91 is formed with a vertical communication groove 911, the communication groove 911 is used for communicating with a gap between two corresponding heat exchange plates 951, and the communication groove 911 is provided with one on four side walls of the tank 91, so that the heat exchange inlet pipe 96, the heat exchange outlet pipe 97, the steam inlet pipe 92 and the steam outlet pipe 93 are all communicated with the corresponding communication groove 911. The upper portion of box 91 is provided with lid 912, lid 912 passes through the bolt and seals and fixed connection with box 91, be provided with in the middle part of lid 912 and compress tightly subassembly 98, compress tightly subassembly 98 includes pressure disk 981 and screw 982, screw 982 threaded connection is on lid 912 and be located the middle part of lid 912 and run through lid 912 setting, screw 982 is located the one end and pressure disk 981 fixed connection in the lid 912, pressure disk 981 is used for the butt on the heat transfer plate 951 of the top, after lid 912 is connected with box 91, rethread rotates screw 982 and makes adjacent two heat transfer plates 951 extrudees each other, in order to reach the effect of sealing between the adjacent two heat transfer plates 951, the side of heat transfer plate 951 is laminated with the inner wall of box 91 and is sealed the setting simultaneously. A plurality of heat dissipation plates 99 are provided on the inner wall of the U-shape of the heat exchange plate 951, and through holes 991 are provided on the heat dissipation plates 99, so that when the air flow passes through the through holes 991 on the heat dissipation plates 99, the heat exchange with the heat dissipation plates 99 and the heat exchange plate 951 is easier.

The embodiment of the application also discloses a blast furnace slag waste heat recycling process, which is characterized in that the blast furnace slag waste heat recycling system disclosed by the embodiment is used for recycling blast furnace slag waste heat, and comprises the steps of mixing a gas flow blown in by a granulating unit with particles after granulating the blast furnace slag, so that the heat of the blast furnace slag is transferred into the gas flow, the gas flow enters into a dust remover 1, the inside of an annular air cavity 11 formed between a shell 4 and an inner cylinder 5 is spirally moved, larger particles in the gas flow are attached to the inner wall of the shell 4, smaller particles in the gas flow can enter into the inner cylinder 5 along with the gas flow, an oil outlet device 6 is used for leading oil to the inner wall of the inner cylinder 5 in a dripping manner, and a cooling device 9 is used for leading cooled steam into a cooling cavity 53, so that the temperature of the inner layer 51 is reduced, and the oil paved on the inner wall of the inner cylinder 5 is prevented from being burnt; meanwhile, the scraping device 7 spreads oil through the spiral blades 71, air flows spirally move along the position between the inner cylinder 5 and the spiral blades 71 when passing through the inner cylinder 5, smaller particles in the air flow are further adhered to an oil film, dust on the oil film is cleaned by secondary scraping through the spiral blades 71 and is discharged downwards out of the inner cylinder 5, so that the air flow can directly enter the hot blast stove 2 after being filtered, the air outlet temperature of the hot blast stove 2 is improved by 50-100 ℃, and the utilization efficiency of blast furnace slag can be more effectively improved.

The above embodiments are not intended to limit the scope of the present application, so: all equivalent changes in structure, shape and principle of the application should be covered in the scope of protection of the application.

Claims (10)

1. A blast furnace slag waste heat recovery and utilization process is characterized in that: the method comprises the steps of recovering heat of blast furnace slag through air flow, filtering the air flow, and introducing the filtered air flow into the hot blast stove (2) for air supply of the hot blast stove (2).

2. A blast furnace slag waste heat recycling system is characterized in that: the air inlet of the dust remover (1) is used for being connected with the air outlet of the granulating unit, and the air flow in the dust remover (1) is used for being introduced into the hot blast stove (2) after being filtered.

3. The blast furnace slag waste heat recovery and utilization system according to claim 2, wherein: the dust remover (1) comprises a shell (4) and an inner barrel (5), wherein the shell (4) is vertically arranged, a relevant air blower (41) is arranged at the lower end of the shell (4), the inner barrel (5) is vertically arranged at the central position of the shell (4), air flow enters into an annular air cavity (11) between the shell (4) and the inner barrel (5) along the tangential direction of the shell (4) from the upper part of the shell (4), the upper end of the inner barrel (5) extends out of the shell (4) and is used for connecting a hot blast stove (2), and an oil outlet device (6) for dripping oil on the inner wall of the shell (4) and a scraping device (7) for cleaning oil sludge on the inner wall of the inner barrel (5) are arranged on the inner barrel (5).

4. A blast furnace slag waste heat recovery and utilization system according to claim 3, wherein: the scraping device (7) comprises a spiral blade (71), an intermediate shaft (72) and a supporting frame (73), wherein the intermediate shaft (72) is rotatably arranged at the center position of the inner cylinder (5) through the supporting frame (73), the spiral blade (71) is fixed on the outer wall of the intermediate shaft (72), and the edge of the spiral blade (71) is in clearance fit with the inner wall of the inner cylinder (5).

5. The blast furnace slag waste heat recovery and utilization system according to claim 4, wherein: a plurality of air holes (12) are formed in the side wall of the lower end of the inner cylinder (5), and the air holes (12) are arranged at the lower end of the inner cylinder (5).

6. The blast furnace slag waste heat recovery and utilization system according to claim 4, wherein: the upper end of shell (4) is provided with drive arrangement (8), drive arrangement (8) are including interior mounting bracket (81), swivel becket (82) and drive vane (83), interior mounting bracket (81) are fixed on the outer wall of inner tube (5), swivel becket (82) rotate connect including on mounting bracket (81), drive vane (83) set up along the radial direction of swivel becket (82), drive vane (83) are high with the position that the air current got into on shell (4), swivel becket (82) pass through connecting rod (84) fixed connection with the center pin, and connecting rod (84) are located the outside of inner tube (5) and are in shell (4).

7. The blast furnace slag waste heat recovery and utilization system according to any one of claims 3 to 6, wherein: the inner cylinder (5) comprises an inner layer (51) and an outer layer (52), the inner layer (51) and the outer layer (52) are sleeved and connected, a cooling cavity (53) is formed between the inner layer (51) and the outer layer (52), and the cooling cavity (53) is connected with a cooling device (9).

8. The blast furnace slag waste heat recovery and utilization system according to claim 7, wherein: the cooling device (9) comprises a box body (91), a steam inlet pipe (92), a steam outlet pipe (93) and a conveying pump (94), wherein a heat exchange assembly (95) is arranged in the box body (91), one end of the steam inlet pipe (92) is connected with the box body (91), the other end of the steam inlet pipe enters a cooling cavity (53) from the top of an inner cylinder (5) and extends to the lower end of the inner cylinder (5), the steam outlet pipe (93) is connected to the top of the inner cylinder (5), the steam outlet pipe (93) and the steam inlet pipe (92) are respectively connected with the opposite side walls of the box body (91), the steam in the box body (91) is cooled through the heat exchange assembly (95), and the conveying pump (94) is arranged on the steam inlet pipe (92).

9. The blast furnace slag waste heat recovery and utilization system according to claim 8, wherein: the heat exchange assembly (95) comprises a plurality of heat exchange plates (951), the plurality of heat exchange plates (951) are sequentially stacked from top to bottom, the heat exchange plates (951) are U-shaped, two adjacent heat exchange plates (951) are stacked and placed, the heat exchange inlet pipe (96) and the heat exchange outlet pipe (97) are further connected to the box body (91), the heat exchange inlet pipe (96) and the heat exchange outlet pipe (97) are arranged on opposite side walls of the box body (91), one communicating groove (911) is formed in each of four side walls of the box body (91), and the steam inlet pipe (92), the steam outlet pipe (93), the heat exchange inlet pipe (96) and the heat exchange outlet pipe (97) are all communicated with one communicating groove (911).

10. The blast furnace slag waste heat recovery and utilization system according to claim 9, wherein: the top of box (91) is provided with lid (912), lid (912) is fixed on box (91) to the middle part of lid (912) is provided with and compresses tightly subassembly (98), compress tightly subassembly (98) including pressure disk (981) and screw rod (982), screw rod (982) threaded connection is on lid (912), lid (912) inboard and with pressure disk (981) fixed connection are inserted to screw rod (982) one end, pressure disk (981) are used for the butt on heat exchanger plate (951) of top.