CN115627304A - Efficient wind-crushing waste heat recovery method and device for molten electric furnace slag - Google Patents
Efficient wind-crushing waste heat recovery method and device for molten electric furnace slag Download PDFInfo
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- CN115627304A CN115627304A CN202211327798.1A CN202211327798A CN115627304A CN 115627304 A CN115627304 A CN 115627304A CN 202211327798 A CN202211327798 A CN 202211327798A CN 115627304 A CN115627304 A CN 115627304A
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- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21B—MANUFACTURE OF IRON OR STEEL
- C21B3/00—General features in the manufacture of pig-iron
- C21B3/04—Recovery of by-products, e.g. slag
- C21B3/06—Treatment of liquid slag
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- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21B—MANUFACTURE OF IRON OR STEEL
- C21B3/00—General features in the manufacture of pig-iron
- C21B3/04—Recovery of by-products, e.g. slag
- C21B3/06—Treatment of liquid slag
- C21B3/08—Cooling slag
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01K—STEAM ENGINE PLANTS; STEAM ACCUMULATORS; ENGINE PLANTS NOT OTHERWISE PROVIDED FOR; ENGINES USING SPECIAL WORKING FLUIDS OR CYCLES
- F01K27/00—Plants for converting heat or fluid energy into mechanical energy, not otherwise provided for
- F01K27/02—Plants modified to use their waste heat, other than that of exhaust, e.g. engine-friction heat
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- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21B—MANUFACTURE OF IRON OR STEEL
- C21B2400/00—Treatment of slags originating from iron or steel processes
- C21B2400/02—Physical or chemical treatment of slags
- C21B2400/022—Methods of cooling or quenching molten slag
- C21B2400/026—Methods of cooling or quenching molten slag using air, inert gases or removable conductive bodies
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- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21B—MANUFACTURE OF IRON OR STEEL
- C21B2400/00—Treatment of slags originating from iron or steel processes
- C21B2400/08—Treatment of slags originating from iron or steel processes with energy recovery
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Abstract
The invention provides a method and a device for recovering waste heat of molten electric furnace slag through efficient wind crushing, wherein the method comprises the following steps: s1, pouring steel slag; s2, wind crushing and cooling the electric furnace slag, performing wind crushing treatment on the molten electric furnace slag to obtain high-temperature granulated electric furnace slag, and performing cooling treatment on the high-temperature granulated electric furnace slag to obtain low-temperature granulated electric furnace slag; s3, waste heat recovery power generation; and S4, discharging the electric furnace slag. The method and the device for treating the electric furnace slag have the advantages of clean and clean, full-closed and high-efficiency recovery of waste heat.
Description
Technical Field
The invention relates to the technical field of metallurgy, in particular to a method and a device for recovering waste heat generated by efficiently wind crushing molten electric furnace slag in the production process of iron and steel enterprises.
Background
At present, the specific gravity of the electric furnace steel in China is only about 10%, while the proportion of the electric furnace steel in developed countries in Europe and America is up to more than 60%, and with the increase of the circulation quantity of waste steel in China and the requirement of low-carbon economic development, the proportion of the electric furnace steel in China will be rapidly increased and tends to be in the level of the developed countries in the future. The electric furnace slag has the characteristics of high slag discharging temperature, good fluidity, low iron content, high calorific value content and the like, and is suitable for treating the steel slag by adopting a wind crushing mode.
At present, the electric furnace slag treatment in China often adopts a backward hot splashing method treatment mode, the application of a steel slag wind crushing technology is very little, the existing wind crushing technology mainly adopts compressed air to carry out impact cooling crushing on steel slag with good fluidity, and the electric furnace slag wind crushing technology has the advantages of high treatment efficiency and small occupied area, but the existing wind crushing treatment site has the problem of poor tightness, and the treatment site environment is very severe.
In addition, the steel slag temperature after the wind break is still higher, has more high temperature red sediment, can not directly transport to the broken magnetic separation processing line of steel slag, still need beat water cooling or directly get into the basin under the wind-force drive and cool off, and the high temperature red sediment after the wind break meets water and will produce a large amount of vapor, and site environment discharges and can't reach standard, and heat energy more can't effectively utilize.
Disclosure of Invention
In order to solve the problems of the existing electric furnace slag treatment process, the invention provides the method and the device for efficiently recycling the wind breaking waste heat of the molten electric furnace slag.
The above purpose is realized by the following scheme:
a method for recovering high-efficiency wind-crushing waste heat of molten electric furnace slag comprises the following steps:
s1, dumping steel slag, namely lifting and placing a hot slag tank containing molten electric furnace slag on a tilting machine through a crown block, tilting and dumping the molten electric furnace slag by the tilting machine according to a certain speed, and uniformly and stably dropping the molten electric furnace slag from the hot slag tank into a wind breaking bin through a slag dumping groove;
s2, wind crushing and cooling the electric furnace slag, performing wind crushing treatment on the molten electric furnace slag to obtain high-temperature granulated electric furnace slag, and performing cooling treatment on the high-temperature granulated electric furnace slag to obtain low-temperature granulated electric furnace slag;
s3, waste heat recovery power generation, wherein normal-temperature air of a slag breaking fan and a cooling fan enters an air breaking bin and a cooling bin is subjected to heat exchange with molten electric furnace slag to form high-temperature flue gas, the high-temperature flue gas is subjected to heat exchange through a heat exchanger to obtain pressure steam, and then a generator is driven to generate power;
and S4, discharging the electric furnace slag, wherein the cooled low-temperature granulated electric furnace slag is discharged in a rotating mode through a discharge valve and falls into a cold slag tank, and then the granulated electric furnace slag is transported to a steel slag processing line through a slag transport vehicle for resource treatment and utilization.
Further, in the step S2, the process of wind crushing the molten electric furnace slag to obtain high-temperature granulated electric furnace slag includes that the slag crushing fan wind-crushes the molten electric furnace slag falling into the wind crushing bin with normal-temperature compressed air through the cold air pipe, the molten electric furnace slag is cooled down to a certain temperature through quenching and is converted into high-temperature granulated electric furnace slag, and then the granulated electric furnace slag moves to the upper side of the cooling bin under the power action of the compressed air and falls into the cooling bin under the action of gravity.
Further, in the step S2, the cooling treatment of the high-temperature granulated electric furnace slag to obtain the low-temperature granulated electric furnace slag includes that the cooling fan uniformly cools the high-temperature granulated electric furnace slag in the cooling bin through the air equalizing tower, the granulated electric furnace slag gradually descends under the action of the vibrating feeder, and the granulated electric furnace slag is continuously cooled to a certain temperature and is converted into the low-temperature granulated electric furnace slag.
Further, in the step S3, the high-temperature flue gas is converted into low-temperature flue gas at a certain temperature through the heat exchanger, and the low-temperature flue gas meets the emission standard after being treated by the bag-type dust collector, and is further discharged out through a chimney under the action of the induced draft fan.
Further, in the step S2, the working pressure of compressed air blown out by the slag crushing fan through the cold air pipe is 0.2-0.6Mpa, the working pressure of cold air blown into the cooling bin by the cooling fan is 5-20KPa, and the working pressure of the induced draft fan is 1.5-5Kpa.
Further, in step S2, the molten electric furnace slag is quenched and cooled to be high-temperature granulated electric furnace slag with the temperature of 800-1200 ℃ by compressed air, the high-temperature granulated electric furnace slag is gradually cooled to be low-temperature granulated electric furnace slag with the temperature of 80-200 ℃ by a cooling fan, no red slag which is not cooled is included, the granularity of the granulated electric furnace slag is 0-10mm, and the average granularity is about 2mm.
Further, in the step S3, the temperature of the high-temperature flue gas generated by the wind crushing treatment of the molten electric furnace slag is 200-600 ℃, the temperature of the high-temperature flue gas recovered from one ton of molten electric furnace slag is 2000-6000m3, the power generation of 20-40kWh per ton of molten electric furnace slag is realized by adopting a power generator, and the concentration of the discharged flue gas is lower than 10mg/m3 after the treatment of a bag-type dust collector.
And further, the molten electric furnace slag is automatically poured by a tipping machine, the temperature of the molten electric furnace slag is 1400-1700 ℃ during pouring, the pouring period of a hot slag tank is 3-30 minutes, and the molten electric furnace slag is poured from the tipping machine and falls into a cold slag tank through a discharge valve, so that the treatment period is 20-120 minutes.
The invention also provides a device for recovering the high-efficiency wind breaking waste heat of the molten electric furnace slag, which is used for the method for recovering the high-efficiency wind breaking waste heat of the molten electric furnace slag, and the device comprises a hot slag tank, a tipping machine, a bracket, the molten electric furnace slag, a slag pouring groove, a wind breaking bin, a slag breaking fan, a cold air pipe, a solid slag discharge opening, a cooling bin, a cooling fan, an air equalizing tower, a vibrating feeder, a discharge valve, granulated electric furnace slag, a cold slag tank, a slag transport vehicle and a flue gas heat recovery and purification device, wherein the hot slag tank is arranged on the tipping machine, and the tipping machine is arranged above the bracket; the molten electric furnace slag is arranged in a hot slag tank, a slag pouring groove is arranged below the hot slag tank and above a wind crushing bin; the slag crushing fan is arranged below one side of the air crushing bin, and the cold air pipe is connected with the slag crushing fan and extends to the lower part of the slag pouring groove; the solid slag discharge opening is arranged right below the slag pouring groove at the bottom of the air crushing bin; the cooling bin is arranged below the bottom of one side of the air crushing bin and on the opposite side of the slag crushing fan; the cooling fan is arranged at one side of the lower position of the cooling bin and is connected with the air equalizing tower through a cold air pipe; the air equalizing tower is arranged at the right middle position below the cooling bin; the vibrating feeder is arranged at the bottom of the cooling bin, and the discharge valve is arranged below the vibrating feeder; the granulated electric furnace slag is arranged in a cold slag tank, and the cold slag tank is arranged below a discharge valve and above a slag transport vehicle.
Further, the flue gas heat recovery and purification device comprises a flue gas pipe, a steam leading pipe, a heat exchanger, a bag-type dust collector, an induced draft fan, a chimney and a generator; the cooling bin, the heat exchanger, the bag-type dust collector, the induced draft fan and the chimney are sequentially connected through a flue gas pipe; the heat exchanger is connected with a generator through a steam leading pipe.
The invention has the beneficial effects that:
the method is based on the characteristics of the molten electric furnace slag, adopts the compressed air to realize the high-efficiency granulation of the molten electric furnace slag, and converts the electric furnace slag from a liquid state into solid particles, thereby providing conditions for subsequent waste heat recovery.
The invention adopts the air cooling technology to convert the heat in the high-temperature granulated electric furnace slag into high-temperature flue gas, the high-temperature flue gas generates electricity through a heat exchanger, a generator and other devices to realize the waste heat utilization of the molten electric furnace slag, and meanwhile, the high-temperature flue gas is treated and then discharged after reaching the standard.
The invention has the advantages of simple process, high equipment automation degree, short system treatment period, low economic cost, high production efficiency, high equipment level, fully closed process, full recovery and utilization of waste heat, and outstanding process and environmental protection advantages, and the treatment process meets the requirement of ultralow emission.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the embodiments or the prior art descriptions will be briefly described below, it is obvious that the drawings in the following description are only embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the provided drawings without creative efforts.
FIG. 1 is a flow chart of a method for recovering waste heat from high-efficiency wind crushing of molten electric furnace slag provided by the invention;
fig. 2 is a schematic diagram of the efficient wind-crushing waste heat recovery device for the molten electric furnace slag provided by the invention.
Description of reference numerals:
the device comprises a hot slag tank 1, a tilting machine 2, a support 3, molten electric furnace slag 4, a slag pouring groove 5, a wind crushing bin 6, a slag crushing fan 7, a cold air pipe 8, a solid slag discharge opening 9, a cooling bin 10, a cooling fan 11, an air equalizing tower 12, a vibrating feeder 13, a discharge valve 14, granulated electric furnace slag 15, a cold slag tank 16, a slag transport vehicle 17, a flue gas pipe 18, a steam leading pipe 19, a heat exchanger 20, a bag-type dust collector 21, a draught fan 22, a chimney 23 and a generator 24.
Detailed Description
In order to make the technical solutions of the present invention better understood, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc., indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, and are only for convenience of description and simplicity of description, but do not indicate or imply that the device or element being referred to must have a particular orientation, be constructed and operated in a particular orientation, and thus, should not be construed as limiting the present invention. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.
Referring to fig. 1-2, the invention provides a method for recovering waste heat from high-efficiency wind crushing of molten electric furnace slag, which comprises the following steps:
s1, dumping steel slag, namely lifting and placing a hot slag tank 1 containing molten electric furnace slag 4 on a tilting machine 2 through a crown block, tilting and dumping the slag through the tilting machine 2 at a certain speed, and uniformly and stably dropping the molten electric furnace slag 4 from the hot slag tank 1 into an air crushing bin 6 through a slag dumping groove 5;
s2, wind crushing and cooling the electric furnace slag, wind crushing the molten electric furnace slag 4 to obtain high-temperature granulated electric furnace slag 15, and cooling the high-temperature granulated electric furnace slag 15 to obtain low-temperature granulated electric furnace slag 15;
s3, waste heat recovery power generation is carried out, normal-temperature air blown into the air breaking bin 6 and the cooling bin 10 by the slag breaking fan 7 and the cooling fan 11 exchanges heat with the molten electric furnace slag 4 to form high-temperature flue gas, the high-temperature flue gas exchanges heat through the heat exchanger 20 to obtain pressure steam, and then the pressure steam drives the generator 24 to generate power;
and S4, discharging the electric furnace slag, wherein the cooled low-temperature granulated electric furnace slag 15 is discharged in a rotating mode through a discharge valve 14 and falls into a cold slag tank 16, and then is transported to a steel slag processing line through a slag transport vehicle 17 for resource treatment and utilization.
In the step S2, the process of wind crushing the molten electric furnace slag 4 to obtain the high-temperature granulated electric furnace slag 15 includes the steps that the slag crushing fan 7 wind-crushes the molten electric furnace slag 4 falling into the wind crushing bin 6 by using normal-temperature compressed air through the cold air pipe 8, the molten electric furnace slag 4 is cooled down to a certain temperature through quenching and is converted into the high-temperature granulated electric furnace slag 15, and then the high-temperature granulated electric furnace slag 15 moves to the upper side of the cooling bin 10 under the power action of the compressed air and falls into the cooling bin 10 under the action of gravity.
In the step S2, the cooling treatment of the high-temperature granulated electric slag 15 to obtain the low-temperature granulated electric slag 15 includes that the cooling fan 11 uniformly cools the high-temperature granulated electric slag 15 in the cooling bin 10 through the air equalizing tower 12, and the granulated electric slag 15 gradually descends under the action of the vibrating feeder 13 and is continuously cooled to a certain temperature to be converted into the low-temperature granulated electric slag 15.
In step S3, the high-temperature flue gas is converted into low-temperature flue gas at a certain temperature by the heat exchanger 20, and the low-temperature flue gas is processed by the bag-type dust collector 21 to meet the emission standard, and then is discharged out through the chimney 23 under the action of the induced draft fan 22.
In the step S2, the working pressure of compressed air blown out by the slag crushing fan 7 through the cold air pipe 8 is 0.2-0.6Mpa, the working pressure of cold air blown into the cooling bin 10 by the cooling fan 11 is 5-20KPa, and the working pressure of the induced draft fan 22 is 1.5-5KPa.
In the step S2, the molten electric furnace slag 4 is rapidly cooled to be the high-temperature granulated electric furnace slag 15 with the temperature of 800-1200 ℃ by compressed air, the high-temperature granulated electric furnace slag 15 is gradually cooled to be the low-temperature granulated electric furnace slag 15 with the temperature of 80-200 ℃ by the cooling fan 11, no uncooled red slag is included, the granularity of the granulated electric furnace slag 15 is 0-10mm, and the average granularity is about 2mm.
In the step S3, the temperature of the high-temperature flue gas of the molten electric furnace slag 4 subjected to air crushing treatment is 200-600 ℃, the temperature of the high-temperature flue gas recycled from one ton of the molten electric furnace slag 4 is 2000-6000m < 3 >, the power generation of 20-40kWh per ton of the molten electric furnace slag 4 is realized by adopting a power generator 24, and the concentration of the discharged flue gas after the treatment by the bag-type dust remover 21 is lower than 10mg/m < 3 >.
The molten electric furnace slag 4 is automatically poured by the tipping machine 2, the temperature of the molten electric furnace slag 4 is 1400-1700 ℃ during pouring, the pouring period of one hot slag tank 1 is 3-30 minutes, and the molten electric furnace slag 4 is poured from the tipping machine 2 and is discharged through the discharge valve 14 and falls into the cold slag tank 16 for a treatment period of 20-120 minutes.
The invention also provides a high-efficiency wind breaking waste heat recovery device for the molten electric furnace slag, which comprises a hot slag tank 1, a tipping machine 2, a bracket 3, the molten electric furnace slag 4, a slag pouring groove 5, a wind breaking bin 6, a slag breaking fan 7, a cold air pipe 8, a solid slag discharge opening 9, a cooling bin 10, a cooling fan 11, an air equalizing tower 12, a vibrating feeder 13, a discharge valve 14, granulated electric furnace slag 15, a cold slag tank 16, a slag transport vehicle 17 and a flue gas heat recovery and purification device, wherein the hot slag tank 1 is arranged on the tipping machine 2, and the tipping machine 2 is arranged above the bracket 3; the molten electric furnace slag 4 is arranged in the hot slag tank 1, the slag pouring groove 5 is arranged below the hot slag tank 1 and above the air breaking bin 6; a slag crushing fan 7 is arranged below one side of the air crushing bin 6, and a cold air pipe 8 is connected with the slag crushing fan 7 and extends to the lower part of the slag pouring groove 5; the solid slag discharge opening 9 is arranged right below the slag pouring groove 5 at the bottom of the air crushing bin 6; the cooling bin 10 is arranged below the bottom of one side of the air crushing bin 6 and on the opposite side of the slag crushing fan 7; the cooling fan 11 is arranged at one side of the lower position of the cooling bin 10 and is connected with the air equalizing tower 12 through the cold air pipe 8; the wind equalizing tower 12 is arranged at the right middle position below the cooling bin 10; the vibrating feeder 13 is arranged at the bottom of the cooling bin 10, and the discharge valve 14 is arranged below the vibrating feeder 13; the granulated electric furnace slag 15 is in a cold slag tank 16, and the cold slag tank 16 is below the discharge valve 14 and above a slag car 17.
The flue gas heat recovery and purification device comprises a flue gas pipe 18, a steam leading pipe 19, a heat exchanger 20, a bag-type dust collector 21, an induced draft fan 22, a chimney 23 and a generator 24; the cooling bin 10, the heat exchanger 20, the bag-type dust collector 21, the induced draft fan 22 and the chimney 23 are sequentially connected through the flue gas pipe 18; the heat exchanger 20 is connected to a generator 24 via a steam leading pipe 19.
Wherein the hot slag tank (1), the slag pouring groove (5) and the cold slag tank (16) are all made of steel materials, and the wall thickness is 30-200mm. The volumes of the hot slag tank (1) and the cold slag tank (16) are 5-30m < 3 >. The volume of the slag pouring groove (5) is not less than 3m < 3 >, a fireproof heat-insulating material is arranged in the slag pouring groove (5), and the thickness of the fireproof material is 30-300mm.
The air crushing bin (6) is a closed cuboid bin body, and the outside of the air crushing bin is made of steel plates and steel structure supporting materials, wherein the thickness of each steel plate is 3-30mm; the inner part is provided with refractory material, and the thickness of the refractory material is 30-300mm. The length of the wind crushing bin (6) is 5-20m, the width is 5-10m, and the height is 2-6m.
Wherein the solid slag discharge opening (9) is positioned below the slag pouring groove (5) at the bottom of the air crushing bin (6), the main body of the solid slag discharge opening (9) is of a steel plate structure, the thickness of the steel plate is 10-30mm, and the sectional area of the solid slag discharge opening (9) is 4-30m 2 。
The cooling bin (10) is a cylindrical bin body, the upper part of the cooling bin is connected with the lower part of one side of the air crushing bin (6), a steel plate and a steel structure supporting material are arranged outside the cooling bin (10), and the thickness of the steel plate is 3-30mm; the inner part is provided with a refractory material, and the thickness of the refractory material is 50-300mm. The inner diameter of the cooling bin (10) is 3-10m, and the height is 2-6m.
Wherein, the slag breaking fan (7), the cooling fan (11) and the induced draft fan (22) are frequency conversion fans, and the slag breaking fan (7) and the cooling fan (11) are air blowers. The cold air pipe (8) is a steel structure pipeline, and the thickness of the pipe wall is 2-6mm.
Wherein, the wind equalizing tower (12) is a wind distribution facility with a conical heat-resistant steel structure, and the gradient of the cone is 15-45 degrees; the diameter of the bottom of the wind equalizing tower (12) is 1-5m, and the thickness of the steel structure plate is 5-50mm.
Wherein, the vibrating feeder (13) adopts a high-temperature resistant steel structure lining plate, and can meet the requirement that the long-term operation temperature is not lower than 200 ℃; the vibration frequency of the vibrating feeder (13) is 500-1500 times/minute, and the processing capacity is 10-200t/h. The discharge valve (14) adopts a high-temperature resistant rotary discharge valve, and can meet the requirement that the long-term operation temperature is not lower than 200 ℃; the rotating speed of the discharge valve (14) is 10-50 r/min, and the sectional area of the material inlet and the material outlet of the discharge valve (14) is 0.5-5m 2 。
Wherein, the flue gas pipe (18) and the steam leading pipe (19) are steel structure pipes, and the outside is provided with heat insulation materials for heat insulation, and the thickness of the heat insulation materials is 30-100mm. The steam leading pipe (19) is a pressure pipeline and can bear the maximum pressure not less than 1MPa.
In the description herein, references to the description of the term "one embodiment," "some embodiments," "an illustrative embodiment," "an example," "a specific example," or "some examples" or the like mean that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the invention. In this specification, the schematic representations of the terms used above do not necessarily refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.
The previous description of the disclosed embodiments is provided to enable any person skilled in the art to make or use the present invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the generic principles defined herein may be applied to other embodiments without departing from the spirit or scope of the invention. Thus, the present invention is not intended to be limited to the embodiments shown herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.
Claims (10)
1. The method for recovering the high-efficiency wind crushing waste heat of the molten electric furnace slag is characterized by comprising the following steps of:
s1, pouring steel slag, namely lifting and placing a hot slag tank (1) containing molten electric furnace slag (4) on a tilting machine (2) through a crown block, tilting the tilting machine (2) at a certain speed to pour the molten electric furnace slag (4), and uniformly and stably dropping the molten electric furnace slag (4) from the hot slag tank (1) into a wind breaking bin (6) through a slag pouring groove (5);
s2, wind crushing and cooling the electric furnace slag, wind crushing the molten electric furnace slag (4) to obtain high-temperature granulated electric furnace slag (15), and cooling the high-temperature granulated electric furnace slag (15) to obtain low-temperature granulated electric furnace slag (15);
s3, waste heat recovery power generation, wherein normal temperature air blown into the air breaking bin (6) and the cooling bin (10) by the slag breaking fan (7) and the cooling fan (11) exchanges heat with the molten electric furnace slag (4) to form high temperature flue gas, the high temperature flue gas exchanges heat through the heat exchanger (20) to obtain pressure steam, and then the pressure steam drives the generator (24) to generate power;
and S4, discharging the electric furnace slag, wherein after cooling, the low-temperature granulated electric furnace slag (15) is discharged in a rotating manner through a discharge valve (14) and falls into a cold slag tank (16), and then is transported to a steel slag processing line through a slag transport vehicle (17) for resource treatment and utilization.
2. The method for recovering the waste heat from the efficient air crushing of the molten electric furnace slag as claimed in claim 1, wherein in the step S2, the air crushing of the molten electric furnace slag (4) to obtain the high-temperature granulated electric furnace slag (15) comprises the steps of performing the air crushing of the normal-temperature compressed air on the molten electric furnace slag (4) falling into the air crushing bin (6) by a slag crushing fan (7) through a cold air pipe (8), performing the air crushing of the molten electric furnace slag (4) after the molten electric furnace slag (4) is rapidly cooled to a certain temperature and is converted into the high-temperature granulated electric furnace slag (15), and moving the molten electric furnace slag to the upper part of the cooling bin (10) under the power action of the compressed air and falling into the cooling bin (10) under the action of gravity.
3. The method for recovering the waste heat from the high-efficiency wind crushing of the molten electric slag according to the claim 1, wherein in the step S2, the cooling treatment of the high-temperature granulated electric slag (15) to obtain the low-temperature granulated electric slag (15) comprises the steps of uniformly cooling the high-temperature granulated electric slag (15) in the cooling bin (10) by a cooling fan (11) through a wind equalizing tower (12), and gradually descending the granulated electric slag (15) under the action of the vibrating feeder (13) and continuously cooling the granulated electric slag (15) to a certain temperature to be converted into the low-temperature granulated electric slag (15).
4. The method for recovering the high-efficiency wind crushing waste heat of the molten electric furnace slag according to the claim 1, wherein in the step S3, the high-temperature flue gas is converted into low-temperature flue gas with a certain temperature through the heat exchanger (20), the low-temperature flue gas meets the emission standard after being treated by the bag-type dust collector (21), and the low-temperature flue gas is further discharged through the chimney (23) under the action of the induced draft fan (22).
5. The method for recovering the high-efficiency wind crushing waste heat of the molten electric furnace slag according to the claim 1, wherein in the step S2, the working pressure of compressed air blown out by the slag crushing fan (7) through the cold air pipe (8) is 0.2-0.6Mpa, the working pressure of cold air blown into the cooling bin (10) by the cooling fan (11) is 5-20KPa, and the working pressure of the induced draft fan (22) is 1.5-5Kpa.
6. The method for recovering the waste heat from the high-efficiency wind crushing of the molten electric slag according to the claim 1, characterized in that in the step S2, the molten electric slag (4) is rapidly cooled to the high-temperature granulated electric slag (15) of 800-1200 ℃ by compressed air, the high-temperature granulated electric slag (15) is gradually cooled to the low-temperature granulated electric slag (15) of 80-200 ℃ by a cooling fan (11), and there is no red slag which is not cooled, and the grain size of the granulated electric slag (15) is 0-10mm, and the average grain size is about 2mm.
7. The method for recovering the high-efficiency wind crushing waste heat of the molten electric furnace slag according to the claim 1, wherein in the step S3, the temperature of the high-temperature flue gas of the molten electric furnace slag (4) after wind crushing treatment is 200-600 ℃, and the temperature of the high-temperature flue gas recovered from the ton of molten electric furnace slag (4) is 2000-6000m 3 The power generation of 20-40kWh is realized by using a generator (24) per ton of molten electric furnace slag (4), and the molten electric furnace slag is treated by a bag-type dust collector (21)The concentration of discharged flue gas is lower than 10mg/m 3 。
8. The method for recovering the waste heat of the molten electric furnace slag through the wind crushing as recited in claim 1, wherein the molten electric furnace slag (4) is automatically dumped through a tilting machine (2), the temperature of the molten electric furnace slag (4) during dumping is 1400-1700 ℃, the dumping period of a hot slag pot (1) is 3-30 minutes, and the molten electric furnace slag (4) is dumped through the tilting machine (2) and is discharged through a discharge valve (14) and falls into a cold slag pot (16) for a treatment period of 20-120 minutes.
9. The device for recovering the high-efficiency wind breaking waste heat of the molten electric furnace slag is used for the method for recovering the high-efficiency wind breaking waste heat of the molten electric furnace slag according to any one of claims 1 to 8, and is characterized by comprising a hot slag tank (1), a tilting machine (2), a bracket (3), the molten electric furnace slag (4), a slag pouring groove (5), a wind breaking bin (6), a slag breaking fan (7), a cold air pipe (8), a solid slag discharge opening (9), a cooling bin (10), a cooling fan (11), an air equalizing tower (12), a vibrating feeder (13), a discharge valve (14), granulated electric furnace slag (15), a cold slag tank (16), a slag transport vehicle (17) and a flue gas heat recovery and purification device, wherein the hot slag tank (1) is placed on the tilting machine (2), and the tilting machine (2) is arranged above the bracket (3); the molten electric furnace slag (4) is arranged in a hot slag tank (1), a slag pouring groove (5) is arranged below the hot slag tank (1) and above an air crushing bin (6); a slag crushing fan (7) is arranged below one side of the air crushing bin (6), and a cold air pipe (8) is connected with the slag crushing fan (7) and extends to the position below the slag pouring groove (5); the solid slag discharge opening (9) is arranged right below the slag pouring groove (5) at the bottom of the air crushing bin (6); the cooling bin (10) is arranged below the bottom of one side of the air crushing bin (6) and on the opposite side of the slag crushing fan (7); the cooling fan (11) is arranged on one side of the position below the cooling bin (10) and is connected with the air equalizing tower (12) through the cold air pipe (8); the wind equalizing tower (12) is arranged at the right middle position below the cooling bin (10); the vibrating feeder (13) is arranged at the bottom of the cooling bin (10), and the discharge valve (14) is arranged below the vibrating feeder (13); the granulated electric furnace slag (15) is arranged in a cold slag tank (16), and the cold slag tank (16) is arranged below the discharge valve (14) and above a slag transport vehicle (17).
10. The high-efficiency wind-crushing waste heat recovery device for the molten electric furnace slag according to claim 9, wherein the flue gas heat recovery and purification device comprises a flue gas pipe (18), a steam leading pipe (19), a heat exchanger (20), a bag-type dust remover (21), an induced draft fan (22), a chimney (23) and a generator (24); the cooling bin (10), the heat exchanger (20), the bag-type dust remover (21), the induced draft fan (22) and the chimney (23) are sequentially connected through a flue gas pipe (18); the heat exchanger (20) is connected with a generator (24) through a steam leading pipe (19).
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| JP2004238233A (en) * | 2003-02-04 | 2004-08-26 | Jfe Steel Kk | Air-granulated slag, method for producing the same, and equipment for producing the same |
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| CN111850194A (en) * | 2020-08-04 | 2020-10-30 | 中冶节能环保有限责任公司 | High-temperature steel slag bottom blowing air cooling crushing waste heat recovery device and method |
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