CN216639544U - High-temperature steel slag resource comprehensive utilization system - Google Patents
High-temperature steel slag resource comprehensive utilization system Download PDFInfo
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- CN216639544U CN216639544U CN202123331081.8U CN202123331081U CN216639544U CN 216639544 U CN216639544 U CN 216639544U CN 202123331081 U CN202123331081 U CN 202123331081U CN 216639544 U CN216639544 U CN 216639544U
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Abstract
The utility model discloses a high-temperature steel slag resource comprehensive utilization system, which comprises: a steel slag granulating device; a dust removal device; the continuous thermal stewing device is used for thermally stewing materials sequentially through a material distribution area, a thermal stewing area and a material discharging area, wherein partition plates are respectively arranged among the areas; provided is a waste heat power generation device. According to the system, high-temperature steel slag is granulated into solid steel slag, and then spray cooling and heat exchange are carried out in a continuous hot stewing device, so that hot stewed steel slag and high-temperature steam are obtained, wherein the high-temperature steam is used for power generation, and the hot stewed steel slag is subjected to fine crushing and magnetic separation to obtain slag steel, magnetic separation powder and tailing products. The system can realize the comprehensive utilization of high-temperature steel slag resources and effectively recover the sensible heat of the steel slag, and has remarkable economic and environmental benefits.
Description
Technical Field
The utility model relates to the field of metallurgical energy conservation and environmental protection, in particular to a comprehensive utilization system for high-temperature steel slag resources.
Background
The liquid metallurgical slag is a byproduct in the steel smelting production process, and is rich in metal iron, heat energy, non-metallic oxides and other recyclable and resourceful resources.
The hot stewing method has a good effect in the technology of realizing the comprehensive recovery of steel slag resources, the self-pulverization of the steel slag and the self-degradation of free calcium oxide and free magnesium oxide can be realized through the hot stewing reaction, the steel slag after the hot stewing is favorable for small granularity, is easy to grind compared with the steel slag obtained by other processes, is suitable for further processing and magnetic separation utilization, and can finally obtain the steel slag tailings with lower free calcium oxide and free magnesium oxide, thereby being favorable for being reused as a building material with higher quality. The development of a waste heat recovery system on the basis of a thermal annealing method is an important research direction.
The utility model discloses a patent CN201621024762.6 of authorizing provides an utilize slag to have the device that steam electricity generation was produced of hot braising process of pressure, utilizes slag to have the hot braising in-process produced a large amount of low temperature low pressure steam of pressure (pressure more than 0.2MPa, temperature about 140 ℃) to adopt organic rankine system principle, through with the power generation working medium (freon) indirect heat transfer after-drive ORC steam turbine continuous power generation, can realize the net power generation volume of ton sediment more than 3 kWh.
Due to the particularity of the pressure heat braising process and the heat braising device, the steel slag needs to be cooled to 600 ℃ and then enters the slag braising device for heat braising, so that the high-temperature heat of 600-. The prior thermal braising process is intermittent operation, a part of heat can be dissipated in the process, meanwhile, the heat of the steel slag is firstly used for generating thermal braising steam during thermal braising, the heat of the steel slag is transferred into the thermal braising steam, the thermal braising steam is discharged after the thermal braising reaction is finished, the steam temperature is about 140 ℃, the medium-temperature heat at 600 ℃ is changed into the low-temperature heat at 140 ℃, and then the waste heat recovery is carried out, so that the comprehensive heat utilization rate of the steel slag is greatly reduced. The hot stewing steam also contains a large amount of impurities, so that the heat exchanger is often scaled, and the heat exchange efficiency is influenced.
Therefore, the prior art has a place which needs to be improved in the aspects of comprehensive utilization of steel slag resources and waste heat recycling.
Disclosure of Invention
The present invention is directed to solving, at least to some extent, one of the technical problems in the related art. Therefore, the utility model provides a comprehensive utilization system of high-temperature steel slag resources. The system realizes the remarkable recovery of high-temperature waste heat on the basis of realizing good comprehensive recycling effect of the steel slag, and has remarkable economic benefit and environmental benefit.
The utility model provides a high temperature steel slag resource comprehensive utilization system, according to the embodiment of the utility model, this system includes:
the steel slag granulating device is provided with a high-temperature steel slag inlet, a solid steel slag outlet and a flue gas outlet;
the dust removal device is provided with a flue gas inlet and a purified gas outlet, and the flue gas inlet is connected with the flue gas outlet of the steel slag granulating device;
the continuous hot stewing device is provided with a solid steel slag inlet, a spray water inlet, a condensed water inlet, a hot stewing gas outlet, a high-temperature water vapor outlet and a hot stewing steel slag outlet, and the solid steel slag inlet is connected with the solid steel slag outlet of the steel slag granulating device;
the fine crushing and magnetic separation device is provided with a hot-stewed steel slag inlet, a steel slag outlet, a magnetic separation powder outlet and a tailing outlet, and the hot-stewed steel slag inlet is connected with the hot-stewed steel slag outlet;
the waste heat power generation device is provided with a high-temperature steam inlet, an electric energy outlet and a condensed water outlet, the high-temperature steam inlet is connected with the high-temperature steam outlet, and the condensed water outlet is connected with a condensed water inlet of the continuous thermal stewing device.
In addition, the high-temperature steel slag resource comprehensive utilization system provided by the utility model can also have the following additional technical characteristics:
the continuous thermal braising device comprises:
the material distribution area is used for arranging the solid steel slag in the continuous hot braising device;
the hot stewing area is used for completing hot stewing reaction of the steel slag and performing heat exchange to recover the heat of the steel slag;
and the material distribution area is provided with a spiral discharging device to realize continuous discharging of the steel slag.
In addition, the high-temperature steel slag resource comprehensive utilization system provided by the utility model can also have the following additional technical characteristics:
the continuous thermal stewing device is of an annular structure and comprises an annular shell and a rotatable annular furnace bottom, wherein the annular shell covers the rotatable annular furnace bottom to form an annular cavity, and a water seal groove is adopted between the annular shell and the rotatable annular furnace bottom for sealing to prevent gas from overflowing. The annular structure is provided with a material distribution area, a hot stewing area and a material discharging area along the circumference in sequence, and the material distribution area is adjacent to the material discharging area. Preferably, a partition plate is respectively arranged between each zone. The thermal stewing area is provided with an exhaust hole adjacent to the discharging area for exhausting thermal stewing gas.
Preferably, the bottom of the partition plate is 200 mm and 600mm away from the annular furnace bottom. Preferably, the distance between the bottoms of the partition plates and the upper surface of the steel slag layer paved on the furnace bottom is 10-150 mm.
Preferably, the heat-soaking zone is provided with a heat exchanger for recovering heat and generating high-temperature water vapor.
Preferably, the hot stewing area is provided with a spraying system for controlling the hot stewing area to uniformly spray water to cool the steel slag.
The utility model further provides a method for processing steel slag by applying the system, which comprises the following steps:
A. firstly, the steel slag granulation device pretreats the thermal-state steel slag to obtain solid steel slag.
B. The solid steel slag enters the continuous hot braising device through a material distribution area of the continuous hot braising device, sequentially passes through the material distribution area, the hot braising area and a material discharge area, and is continuously discharged from the material discharge area. And a spraying system in the hot stewing area sprays water to cool the steel slag, the steel slag is subjected to hot stewing reaction to obtain hot stewed steel slag and hot stewing gas, and meanwhile, a heat exchanger absorbs the heat of the steel slag to obtain high-temperature water vapor.
C. The hot-stewed steel slag is subjected to fine crushing and magnetic separation treatment to obtain steel slag, magnetic separation powder and a tailing product.
D. High-temperature steam enters the waste heat power generation device to obtain electric energy and condensed water, and the condensed water returns to the heat exchanger of the continuous thermal stewing device to exchange heat again.
In the utility model, the solid steel slag in the step A is non-flowing steel slag, and comprises the following steps: solid and semi-solid. Preferably the solid steel slag temperature is between 700 ℃ and 1250 ℃. More preferably, the solid steel slag has a particle size of 500mm or less, wherein 85% is accounted for by 300mm or less.
And B, the flue gas generated in the steel slag granulation process in the step A can not reach the emission standard, and the flue gas is firstly guided into a dust removal device for purification and then discharged. The dust removing device adopts one or more combination modes of spraying, water bath, electric dust removal, cloth bag dust removal and the like. Preferably, the purified gas contains less than 10mg/Nm3 of solid particles.
And in the step B, the spraying system adopts low-speed water flow to cool the steel slag, and the water flow speed is not more than 1 m/s. Preferably, the spray system forms water droplets with a particle size of 95% not less than 1 mm. The large water drops can effectively reduce the content of impurities brought into the hot stewing gas by water, thereby solving the problem that the contact surface of the heat exchanger and the hot stewing gas is often scaled. More preferably, the water pressure of the spraying system is not more than 0.15 MPa. More preferably, the spraying system sprays water to cool the steel slag at a plurality of positions. After the sprayed low-speed water contacts the steel slag, hot stewing gas containing a large amount of water vapor is generated, and the hot stewing gas ascends to contact with a heat exchanger. High-temperature water vapor is generated in the heat exchanger after heat exchange and is discharged for the power generation of the waste heat power generation device. In a certain temperature range, the steel slag and water or steam are subjected to a thermal braising reaction, and the steel slag realizes self-pulverization and free calcium oxide degradation in the reaction process.
And in the step B, the discharging direction of hot braising gas generated in the hot braising area is the same as the discharging direction of the steel slag. Preferably, the gas exit temperature of the hot-annealing zone is less than 100 ℃. More preferably, the discharge temperature of the hot-stewed steel slag is lower than 100 ℃. Preferably, the air pressure in the heat stewing area is-200 pa to +150 pa.
And C, crushing the hot-stewed steel slag to be less than 10mm, carrying out magnetic separation under a certain magnetic field intensity to obtain slag steel, wherein the iron content of the slag steel is generally more than 80%, carrying out magnetic separation under a stronger magnetic field intensity to obtain magnetic separation powder and tailings, wherein the iron content of the magnetic separation powder is more than 48%, and the metal content of the tailings is less than 2%. The magnetic separation powder and the slag steel are returned to a steel plant for reuse, and the tailings are further finely ground and used for building materials.
And D, the movement direction of the condensed water in the heat exchanger in the hot stewing area is opposite to the movement direction of the steel slag, and the movement direction of the condensed water in the heat exchanger is opposite to the discharge direction of hot stewing gas, so that high-temperature steam with higher temperature is obtained.
The steel slag hot stewing reaction comprises physical change and chemical reaction:
1. physical change
The physical change means that the high-temperature steel slag is rapidly cooled when meeting water vapor, and the slag shell is cracked and separated due to uneven cold contraction caused by different expansion coefficients of steel and slag. Further, as the temperature of the steel slag is lowered, the hydraulic mineral C3S in the slag starts to undergo crystal transformation, and the volume thereof expands, whereby the steel slag is further pulverized. The physical changes are the basis for realizing the separation of the steel slag by the steel slag hot stewing process. The transformation of the crystal form of the hydraulic mineral C3S is as follows, C3S → C2S + CaO.
2. Chemical reaction
The chemical reaction refers to hydrolysis reaction of free calcium oxide and magnesium oxide in the steel slag when meeting water vapor. The hydrolysis reaction eliminates the instability of the steel slag and is the basis of the resource utilization of the steel slag. The specific reaction is that CaO + H2O = = Ca (OH)2 volume expansion of 97.8%, and MgO + H2O = = Mg (OH)2 volume expansion of 148%. Reactions such as 3Fe +4H2O = = Fe3O4+4H2, 2C + O2= =2CO, and the like are also included.
Effect of the utility model
As described above, according to the system and method for comprehensively utilizing high-temperature steel slag resources of the present invention, the continuous thermal annealing device is used to perform an effective thermal annealing reaction and heat exchange of steel slag, so that sensible heat of steel slag from 1250 ℃ to 100 ℃ can be effectively recovered, water vapor with a higher temperature can be obtained, and the effective utilization of high-temperature steel slag resources and the effective recovery of waste heat can be comprehensively achieved. The special continuous thermal annealing device and the spraying system can generate thermal annealing gas with lower impurity content, thereby effectively solving the problem of scaling of the heat exchanger.
In addition, according to the comprehensive utilization system of the high-temperature steel slag resources, most of the heat of the high-temperature steel slag is transferred to the power generation system through heat exchange, the defects that a large amount of water is needed to absorb heat and smoke is discharged outside in the prior art are overcome, the water resources are effectively saved, and the amount of waste gas discharged into the air is reduced.
Drawings
The above and/or additional aspects and advantages of the present invention will become apparent and readily appreciated from the following description of the embodiments, taken in conjunction with the accompanying drawings of which:
FIG. 1 is a schematic structural diagram of a high-temperature steel slag resource comprehensive utilization system according to an embodiment of the utility model;
FIG. 2 is a schematic flow chart of a comprehensive utilization system for high-temperature steel slag resources according to an embodiment of the utility model;
figure 3 is a plan view illustration of a continuous thermal braising apparatus according to one embodiment of the utility model;
figure 4 is a schematic cross-sectional view of a continuous thermal annealing apparatus according to one embodiment of the present invention.
Detailed Description
Reference will now be made in detail to embodiments of the present invention, examples of which are illustrated in the accompanying drawings, wherein like or similar reference numerals refer to the same or similar elements or elements having the same or similar function throughout. The embodiments described below with reference to the drawings are illustrative and intended to be illustrative of the utility model and are not to be construed as limiting the utility model.
In the present invention, unless otherwise expressly stated or limited, the terms "mounted," "connected," "secured," and the like are to be construed broadly and can, for example, be fixedly connected, detachably connected, or integrally formed; can be mechanically or electrically connected; they may be directly connected or indirectly connected through intervening media, or they may be connected internally or in any other suitable relationship, unless expressly stated otherwise. The specific meanings of the above terms in the present invention can be understood by those skilled in the art according to specific situations.
In a first aspect of the present invention, the present invention provides a high-temperature steel slag resource comprehensive utilization system, and according to an embodiment of the present invention, with reference to fig. 1 to 2, the system includes:
a steel slag granulating device S100, which is provided with a high-temperature steel slag inlet S101, a solid steel slag outlet S103 and a flue gas outlet S102; the dust removal device S200 is provided with a flue gas inlet S201 and a purified gas outlet S202, and the flue gas inlet S201 is connected with the flue gas outlet S102; the continuous hot stewing device S300 is provided with a solid steel slag inlet S301, a spray water inlet S302, a condensed water inlet S303, a high-temperature water vapor outlet S304, a hot stewing gas outlet S305 and a hot stewing steel slag outlet S306, wherein the solid steel slag inlet S301 is connected with the solid steel slag outlet S103; the fine crushing and magnetic separation device S400 is provided with a hot braised steel slag inlet S401, a steel slag outlet S402, a magnetic separation powder outlet S403 and a tailings outlet S404, and the hot braised steel slag inlet S401 is connected with the hot braised steel slag outlet S306; the waste heat power generation device S500 is provided with a high-temperature steam inlet S501, an electric energy outlet S503 and a condensed water outlet S502, the high-temperature steam inlet S501 is connected with a high-temperature steam outlet S304 of the continuous heat stewing device, and the condensed water outlet S502 is connected with a condensed water inlet S303 of the continuous heat stewing device.
In addition, the system for comprehensively utilizing the high-temperature steel slag resources according to the embodiment of the utility model can also have the following additional technical characteristics:
the continuous thermal braising apparatus S300 includes: a material distribution area S310, wherein the material distribution area is used for arranging the solid steel slag in a continuous hot stewing device; a hot stewing area S320, wherein the hot stewing area is used for completing the hot stewing reaction of the steel slag and performing heat exchange to recover the heat of the steel slag; and a discharging area S330, wherein the material distribution area is provided with a spiral discharging device S331, so that the continuous discharging of the steel slag is realized.
In addition, the system for comprehensively utilizing the high-temperature steel slag resources according to the embodiment of the utility model can also have the following additional technical characteristics:
continuous heat smoldering device structure is the loop configuration, includes: the annular casing S321, the rotatable annular furnace bottom S322, the water seal groove and the transmission device, the annular casing covers the rotatable annular furnace bottom to form an annular cavity, and the water seal groove S323 is used for sealing between the annular casing and the rotatable annular furnace bottom to prevent gas overflow. The annular structure is sequentially provided with a material distribution area S310, a heat-stewing area S320 and a material discharge area S330 along the circumference, and the material distribution area S310 is adjacent to the material discharge area S330. Preferably, a separation plate S324 is disposed between each of the zones. An exhaust hole S325 is arranged in the position of the thermal stewing area, which is close to the discharging area, and is used for exhausting thermal stewing gas.
According to different treatment capacities, the bottom of the separation plate S324 is 600mm away from the annular furnace bottom 200-. As a preferred embodiment, the distance from the bottom of the partition plate S324 to the upper surface of the steel slag layer S328 of the annular furnace bottom S322 is 10-150 mm.
The heat-soaking zone is provided with a heat exchanger S326 for recovering heat and generating high-temperature water vapor.
And the hot stewing area is provided with a spraying system S327 for controlling the hot stewing area to uniformly spray water to cool the steel slag.
On the other hand, as shown in fig. 1-4, the embodiment of the present invention provides a method for processing steel slag by using the above system, comprising the following steps:
A. firstly, the steel slag granulation device pretreats the thermal-state steel slag to obtain solid steel slag.
B. The solid steel slag enters the continuous hot braising device through a material distribution area of the continuous hot braising device, sequentially passes through the material distribution area, the hot braising area and a material discharge area, and is continuously discharged from the material discharge area. And a spraying system in the hot stewing area sprays water to cool the steel slag, the steel slag is subjected to hot stewing reaction to obtain hot stewed steel slag and hot stewing gas, and meanwhile, a heat exchanger absorbs the heat of the steel slag to obtain high-temperature water vapor.
C. The hot-stewed steel slag is subjected to fine crushing and magnetic separation treatment to obtain steel slag, magnetic separation powder and a tailing product.
D. High-temperature steam enters the waste heat power generation device to obtain electric energy and condensed water, and the condensed water returns to the heat exchanger of the continuous thermal stewing device to exchange heat again.
In the embodiment of the present invention, the solid steel slag in step a is non-flowing steel slag, and includes: solid and semi-solid. As a preferred embodiment, the solid steel slag temperature is between 700 ℃ and 1250 ℃. More preferably, the solid steel slag has a particle size of 500mm or less, wherein 85% is accounted for by 300mm or less.
In the embodiment of the utility model, the spraying system in the step B adopts low-speed water flow to cool the steel slag, and the water flow speed is not more than 1 m/s. Preferably, the spray system forms water droplets with a particle size of 95% not less than 1 mm. The water pressure of the spraying system is not more than 0.15 MPa. The spraying system sprays water to the steel slag at multiple positions for cooling. After the sprayed low-speed water contacts the steel slag, hot stewing gas containing a large amount of water vapor is generated, and the hot stewing gas ascends to contact with a heat exchanger. High-temperature steam is generated in the heat exchanger after heat exchange and is discharged for the power generation of the waste heat power generation device. In a certain temperature range, the steel slag and water or steam are subjected to a thermal braising reaction, and the steel slag realizes self-pulverization and free calcium oxide degradation in the reaction process.
In the embodiment of the utility model, the discharging direction of the hot stewing gas generated in the hot stewing zone in the step B is the same as the discharging direction of the steel slag, and preferably, the gas discharging temperature of the hot stewing zone is lower than 100 ℃. The discharging temperature of the hot-stewed steel slag is lower than 100 ℃. The air pressure in the hot stewing area is-200 pa to +150 pa.
In the embodiment of the utility model, the hot-stewed steel slag in the step C is crushed to be less than 10mm, the slag steel is obtained by magnetic separation under the magnetic field intensity of 1500Gs, the iron content of the slag steel is generally more than 80 percent, then the slag steel is subjected to magnetic separation under the magnetic field intensity of 2500Gs to obtain magnetic separation powder and tailings, the iron content of the magnetic separation powder is more than 48 percent, the metal content of the tailings is less than 2 percent, and the content of free calcium oxide is less than 2.3 percent. The magnetic separation powder and the slag steel are returned to a steel plant for reuse, and the tailings are further finely ground and used for building materials. The magnetic field intensity is not limited, and different magnetic field intensity systems are required for different steel slag properties and product requirements.
In the embodiment of the utility model, in the step D, the movement direction of the condensed water in the heat exchanger in the hot stewing area is opposite to the movement direction of the steel slag; the movement direction of the condensed water in the heat exchanger is opposite to the discharge direction of the hot stewing gas.
The above examples only express embodiments of the present invention, and the description thereof is more specific and detailed, but not construed as limiting the scope of the present invention. It should be noted that, for a person skilled in the art, several variations and modifications can be made without departing from the inventive concept, which falls within the scope of the present invention. Therefore, the protection scope of the present patent shall be subject to the appended claims.
Claims (3)
1. A high temperature steel slag resource comprehensive utilization system is characterized by comprising:
the steel slag granulating device is provided with a high-temperature steel slag inlet, a solid steel slag outlet and a flue gas outlet;
the dust removal device is provided with a flue gas inlet and a purified gas outlet, and the flue gas inlet is connected with the flue gas outlet of the steel slag granulating device;
the continuous hot-braising device is provided with a solid steel slag inlet, a spray water inlet, a condensed water inlet, a hot-braising gas outlet, a high-temperature water vapor outlet and a hot-braising steel slag outlet, and the solid steel slag inlet is connected with the solid steel slag outlet of the steel slag granulating device;
the fine crushing and magnetic separation device is provided with a hot-stewed steel slag inlet, a steel slag outlet, a magnetic separation powder outlet and a tailing outlet, and the hot-stewed steel slag inlet is connected with the hot-stewed steel slag outlet of the continuous hot-stewed device;
the waste heat power generation device is provided with a high-temperature steam inlet, an electric energy outlet and a condensed water outlet, the high-temperature steam inlet is connected with the high-temperature steam outlet, and the condensed water outlet is connected with the condensed water inlet of the continuous thermal stewing device.
2. The comprehensive utilization system for high-temperature steel slag resources as claimed in claim 1, further comprising: the continuous thermal braising device comprises: the material distribution area is used for arranging the solid steel slag in the continuous hot braising device; the hot stewing area is used for completing hot stewing reaction of the steel slag and performing heat exchange to recover the heat of the steel slag, and the hot stewing area is provided with a heat exchanger and a spraying system; and the material distribution area is provided with a spiral discharging device to realize continuous discharging of the steel slag.
3. The high-temperature steel slag resource comprehensive utilization system according to claim 1, further comprising: the continuous hot stewing device is of an annular structure and comprises an annular shell and a rotatable annular furnace bottom, wherein the annular shell covers the rotatable annular furnace bottom to form an annular cavity, a water seal groove is adopted for sealing between the annular shell and the rotatable annular furnace bottom, the annular structure is sequentially provided with a material distribution area, a hot stewing area and a material discharging area along the circumference, the material distribution area is adjacent to the material discharging area, partition plates are respectively arranged between the areas, and exhaust holes are formed in the positions, close to the material discharging area, of the hot stewing area to exhaust hot stewing gas.
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN114015822A (en) * | 2021-12-28 | 2022-02-08 | 北京天朗致达节能环保股份有限公司朝阳分公司 | System for comprehensive utilization and waste heat recovery of high-temperature steel slag resources and treatment method thereof |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114015822A (en) * | 2021-12-28 | 2022-02-08 | 北京天朗致达节能环保股份有限公司朝阳分公司 | System for comprehensive utilization and waste heat recovery of high-temperature steel slag resources and treatment method thereof |
| CN114015822B (en) * | 2021-12-28 | 2023-08-11 | 北京天朗致达节能环保股份有限公司朝阳分公司 | System for comprehensively utilizing high-temperature steel slag resources and recovering waste heat and treatment method thereof |
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