CN113832265A - Blast furnace quenching slag steam whitening technology and device - Google Patents
Blast furnace quenching slag steam whitening technology and device Download PDFInfo
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- CN113832265A CN113832265A CN202110899816.2A CN202110899816A CN113832265A CN 113832265 A CN113832265 A CN 113832265A CN 202110899816 A CN202110899816 A CN 202110899816A CN 113832265 A CN113832265 A CN 113832265A
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- 239000002893 slag Substances 0.000 title claims abstract description 168
- 238000010791 quenching Methods 0.000 title claims abstract description 98
- 230000000171 quenching effect Effects 0.000 title claims abstract description 97
- 230000002087 whitening effect Effects 0.000 title claims abstract description 88
- 238000005516 engineering process Methods 0.000 title description 3
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 234
- 238000000034 method Methods 0.000 claims abstract description 69
- 239000007921 spray Substances 0.000 claims abstract description 32
- 238000005507 spraying Methods 0.000 claims abstract description 27
- 238000007599 discharging Methods 0.000 claims abstract description 8
- 238000009833 condensation Methods 0.000 claims description 33
- 230000005494 condensation Effects 0.000 claims description 33
- 238000001816 cooling Methods 0.000 claims description 24
- 230000018044 dehydration Effects 0.000 claims description 17
- 238000006297 dehydration reaction Methods 0.000 claims description 17
- 238000011010 flushing procedure Methods 0.000 claims description 10
- 238000005469 granulation Methods 0.000 claims description 9
- 230000003179 granulation Effects 0.000 claims description 9
- 239000000203 mixture Substances 0.000 claims description 9
- 238000002156 mixing Methods 0.000 claims description 6
- 230000001502 supplementing effect Effects 0.000 claims description 6
- 239000013049 sediment Substances 0.000 claims description 4
- 238000000926 separation method Methods 0.000 claims description 4
- 239000013589 supplement Substances 0.000 abstract description 6
- 239000002918 waste heat Substances 0.000 abstract description 6
- 238000010079 rubber tapping Methods 0.000 abstract description 4
- 238000003379 elimination reaction Methods 0.000 description 9
- 230000008030 elimination Effects 0.000 description 8
- 238000009825 accumulation Methods 0.000 description 7
- 229910000831 Steel Inorganic materials 0.000 description 5
- 238000004519 manufacturing process Methods 0.000 description 5
- 239000010959 steel Substances 0.000 description 5
- 239000007789 gas Substances 0.000 description 4
- 238000005086 pumping Methods 0.000 description 4
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 238000003723 Smelting Methods 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 239000006227 byproduct Substances 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000009851 ferrous metallurgy Methods 0.000 description 1
- 229910052742 iron Inorganic materials 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 239000003973 paint Substances 0.000 description 1
- 239000002245 particle Substances 0.000 description 1
- 230000002093 peripheral effect Effects 0.000 description 1
- 239000008213 purified water Substances 0.000 description 1
- 229920006395 saturated elastomer Polymers 0.000 description 1
- 239000000779 smoke Substances 0.000 description 1
- 238000009865 steel metallurgy Methods 0.000 description 1
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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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- 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
-
- 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
- C21B2400/024—Methods of cooling or quenching molten slag with the direct use of steam or liquid coolants, e.g. water
-
- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21B—MANUFACTURE OF IRON OR STEEL
- C21B2400/00—Treatment of slags originating from iron or steel processes
- C21B2400/05—Apparatus features
-
- 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
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02W—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO WASTEWATER TREATMENT OR WASTE MANAGEMENT
- Y02W30/00—Technologies for solid waste management
- Y02W30/50—Reuse, recycling or recovery technologies
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- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Manufacturing & Machinery (AREA)
- Materials Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Furnace Details (AREA)
- Waste-Gas Treatment And Other Accessory Devices For Furnaces (AREA)
- Manufacture Of Iron (AREA)
Abstract
The invention provides a steam whitening process for blast furnace quenching slag, which adopts two different steam whitening methods for parallel processing to adapt to the working condition of fluctuation of quenching slag steam quantity. One path is a main steam whitening process, a fan is adopted to introduce steam into a heat exchanger to exchange heat with air, and the heated air and the steam after heat exchange are mixed and discharged to realize whitening; the main steam whitening process runs synchronously with the slag tapping of the blast furnace, and the quenching slag steam is continuously whitened in the slag tapping process of the blast furnace. The other path is a steam whitening auxiliary process, and steam is condensed in a water spraying mode to realize whitening; the steam whitening auxiliary process utilizes the water supplement of the slag treatment circulating water system as spray water, and excessive steam is sprayed and condensed in the slag discharging process of the blast furnace, so that the process can be operated discontinuously. The novel quenching slag steam whitening process utilizes steam waste heat to heat air, can treat most quenching slag steam, reduces the consumption of spray water, and utilizes a system to supplement water and spray the rest excess steam. The invention also provides a blast furnace quenching slag steam whitening device.
Description
Technical Field
The invention relates to the field of steel metallurgy industry and quenching slag steam treatment, in particular to a blast furnace quenching slag steam whitening process and a blast furnace quenching slag steam whitening device.
Background
For a long time, the steam treatment of blast furnace quenching slag in the ferrous metallurgy industry is a difficult problem.
Blast furnace slag is the most main byproduct of the steel industry, about 300kg of blast furnace slag is produced per ton of iron, and the smelting slag temperature is about 1450 ℃, so that the blast furnace slag is a very high-quality heat source. At present, the treatment method of blast furnace slag at home and abroad mainly adopts a water quenching method, and the slag is impacted and crushed by water to form slag particles. By adopting a water quenching process, 40-60% of the high-temperature waste heat of the slag is converted into the low-temperature waste heat of the steam. And, because the quenching slag steam contains H2S and SO2And the paint has strong corrosivity on peripheral equipment and steel structures, and forms white steam pollution.
At present, in the production of blast furnaces, steam generated by contacting slag flushing water with high-temperature slag is discharged to the atmosphere at high altitude through a chimney in some steel mills, and steam whitening is performed in some steel mills in a water spraying and condensing mode. However, the single water spraying mode is adopted to condense and recycle the quenching slag steam, the effect is not good in the actual production, and the main problems are as follows: the spraying water amount is large; the sprayed backwater needs to be cooled by a cooling tower, and the cooling circulating water amount is large; the temperature of spray water supplied from the cooling tower is about 45 ℃, which affects the condensation effect.
In addition, the slag amount shows the characteristic of dynamic fluctuation in the slag discharging process of the blast furnace, so that the fluctuation of the steam amount of the quenching slag is large. In particular, the maximum instantaneous slag discharge of the blast furnace slag sometimes reaches twice the average slag discharge. Under the working condition of large amount of quenching slag steam, even if spraying equipment is increased and the water spraying amount is increased, the effective contact of spraying water and steam is difficult to ensure, the steam is often overflowed and can not be condensed, and the ideal whitening effect can not be realized.
Because the steel industry at home and abroad lacks a mature blast furnace quenching slag steam whitening technology. Therefore, it is necessary to develop a new steam whitening process for blast furnace slag quenching. The new process should save energy and water, and can realize ideal whitening effect under the condition of large fluctuation of the steam amount of the quenching slag.
Disclosure of Invention
The invention aims to overcome the defects of the prior art, and provides a blast furnace quenching slag steam whitening process and a device, which have the characteristics of energy saving and water saving and can realize an ideal whitening effect under the working condition of quenching slag steam amount fluctuation.
The invention is realized by the following steps:
the invention provides a steam whitening process for blast furnace quenching slag, which comprises the following steps: s1, the blast furnace slag falls down at the tail end of the slag runner, and the granulating water is sprayed out from the granulating tank for slag flushing, granulating and water quenching; s2, enabling the slag-water mixture to enter the bottom of a steam condensation tower, then flowing to a dehydration rotary drum for slag-water separation, and enabling slag flushing hot water to enter a hot water tank; s3, in the steps S1 and S2, a large amount of quenching slag steam is generated along with molten slag meeting water, the quenching slag steam is processed in parallel by two different steam whitening methods, one steam whitening method is a main steam whitening process, quenching slag steam is introduced into a heat exchanger by a steam fan to exchange heat with air, heated hot air and steam after heat exchange are mixed and discharged, and whitening is achieved; the other path is a steam whitening auxiliary process, and quenching slag steam is condensed in a water spraying mode to realize whitening.
Preferably, in step S3, the main steam whitening process includes introducing the quenching slag steam from the lower steam accumulation area of the steam condensing tower to the heat exchanger by a steam blower, introducing air to the heat exchanger by an air blower, mixing the heat-exchanged steam and hot air, and exhausting the mixture to the atmosphere to achieve steam whitening.
Preferably, heat exchange condensate water generated by steam phase change in the heat exchanger is sent to the hot water tank through the water return pipe.
Preferably, in step S3, when the amount of the generated quenching slag steam exceeds the air-entraining capacity of the steam blower, the excess quenching slag steam enters the upper steam condensation area of the steam condensation tower, and the quenching slag steam is sprayed from the water spraying device to be condensed, so that the steam whitening is realized.
Preferably, the sprayed water and the steam condensate are collected by a return water collecting device in the steam condensing tower and then are sent to the hot water tank through a return water pipe.
Preferably, the spraying water supplied to the water spraying device is supplied by a slag treatment system water replenishing system, and the slag treatment system water replenishing system is provided with a water replenishing pipe communicated with the hot water tank and can directly replenish water for the slag treatment system.
Preferably, in step S2, the hot water in the hot water tank is precipitated, then sent to the cooling tower for cooling by the return water pump, and then sent to the granulation tank by the water supply pump.
The invention provides a blast furnace quenching slag steam white elimination device, which comprises a heat exchanger and a steam condensation tower, wherein the heat exchanger is positioned outside the steam condensation tower, the steam condensation tower comprises a steam condensation area positioned above and a steam accumulation area positioned below, the blast furnace quenching slag steam white elimination device also comprises a steam fan for pumping quenching slag steam in the steam accumulation area into the heat exchanger, an air fan for pumping air into the heat exchanger, and a discharge pipe for mixing and discharging the steam and hot air after heat exchange into the atmosphere.
Preferably, the steam gathering area is provided with a granulating tank for water quenching and granulating blast furnace slag, the granulating tank is arranged at the tail end of a slag channel for conveying the blast furnace slag, the blast furnace slag-quenching steam whitening device further comprises a dehydration rotary drum and a cooling tower, a slag-water mixture generated by water quenching and granulating of the blast furnace slag flows to the dehydration rotary drum from the bottom of the steam gathering area, the top of the dehydration rotary drum is communicated with the lower part of the steam condensation tower, the bottom of the dehydration rotary drum is provided with a hot water tank, the hot water tank is communicated with a water inlet of the cooling tower through a pipeline and a water return pump, and a water outlet of the cooling tower is communicated with the granulating tank through a pipeline and a water supply pump.
Preferably, a water spraying device is arranged in the steam condensation area, a backwater collecting device is arranged below the water spraying device, a backwater pipe is arranged outside the steam condensation tower, the backwater collecting device is communicated with the hot water tank through the backwater pipe, sprayed water and steam condensate water generated by the water spraying device are collected through the backwater collecting device, the blast furnace quenching slag steam whitening device further comprises a slag treatment system supplementing water system, and the water spraying device and the hot water tank are both communicated with the slag treatment system supplementing water system.
The invention has the following beneficial effects:
the invention provides a novel process for eliminating white in blast furnace quenching slag steam, which adopts two different steam eliminating white methods to be processed in parallel to adapt to the working condition of fluctuation of quenching slag steam quantity. The novel quenching slag steam whitening process heats air by using steam waste heat, can treat most of quenching slag steam, reduces the consumption of spray water, and uses a system to supplement water and spray the rest excess steam, thereby being a water-saving and energy-saving steam whitening process.
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 description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the drawings without creative efforts.
FIG. 1 is a schematic view of a steam whitening apparatus for blast furnace slag quenching provided by an embodiment of the present invention.
Detailed Description
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.
Referring to fig. 1, an embodiment of the present invention provides a steam whitening process for blast furnace slag quenching, including the following steps: s1, the blast furnace slag falls down at the tail end of the slag runner 1, and the granulating water 21 is sprayed out from the granulating tank 2 for slag flushing, granulating and water quenching; s2, enabling the slag-water mixture to enter the bottom of the steam condensation tower 4, then flowing to the dehydration rotary drum 16 for slag-water separation, enabling slag-flushing hot water to enter the hot water tank 17, enabling the hot water in the hot water tank 17 to be precipitated, then sending the hot water to the cooling tower 18 through the water return pump 19 for cooling, and then sending the granulation water 21 to the granulation tank 2 through the water supply pump 20; s3, in steps S1 and S2, a large amount of quenching slag steam is generated along with molten slag meeting water, the quenching slag steam is processed in parallel by two different steam whitening methods, one steam whitening method is a main steam whitening process, quenching slag steam 8 is introduced into a heat exchanger 6 by a steam fan 7 to exchange heat with air 10, heated hot air 12 and heat-exchanged steam 11 are mixed and discharged, and whitening is achieved; the other path is a steam whitening auxiliary process, when the amount of the produced quenching slag steam exceeds the air entraining capacity of the steam fan 7, the excessive quenching slag steam is condensed in a water spraying mode, and whitening is realized. The invention provides a novel process for eliminating white in blast furnace quenching slag steam, which adopts two different steam eliminating white methods to be processed in parallel to adapt to the working condition of fluctuation of quenching slag steam quantity. The novel quenching slag steam whitening process heats air by using steam waste heat, can treat most of quenching slag steam, reduces the consumption of spray water, and uses a system to supplement water and spray the rest excess steam, thereby being a water-saving and energy-saving steam whitening process.
In step S3, the main steam whitening process includes introducing the quenching slag steam 8 to the heat exchanger 6 from the lower steam accumulation area of the steam condensation tower 4 by the steam blower 7, introducing the air 10 to the heat exchanger 6 by the air blower 9, and discharging the heat-exchanged steam 11 and the hot air 12 to the atmosphere 23 in a mixed manner to achieve steam whitening. And heat exchange condensate water 13 generated by the phase change of steam in the heat exchanger 6 is sent to a hot water tank 17 through a water return pipe 15. When the amount of the produced quenching slag steam exceeds the air entraining capacity of the steam fan 7, the excessive quenching slag steam enters the upper steam condensation area of the steam condensation tower 4, and the water spraying device 3 sprays water to condense the quenching slag steam, thereby realizing steam whitening. The sprayed water and the steam condensate are collected by a return water collecting device 5 in the steam condensing tower 4 and then are sent to a hot water tank 17 through a return pipe 15. The spray water 14 supplied to the water spray device 3 is supplied by a slag treatment system make-up water system 24, and the slag treatment system make-up water system 24 is provided with a water replenishing pipe 22 communicated with the hot water tank 17 and can directly replenish water for the slag treatment water system.
The embodiment of the invention also provides a blast furnace quenching slag steam white elimination device, which comprises a heat exchanger 6 and a steam condensation tower 4, wherein the heat exchanger 6 is positioned outside the steam condensation tower 4, the steam condensation tower 4 comprises a steam condensation area positioned above and a steam accumulation area positioned below, the blast furnace quenching slag steam white elimination device also comprises a steam fan 7 for pumping quenching slag steam 8 in the steam accumulation area into the heat exchanger 6, an air fan 9 for pumping air 10 into the heat exchanger 6, and a discharge pipe for mixing and discharging heat-exchanged steam 11 and hot air 12 into the atmosphere 23. The steam gathering area is provided with a granulating tank 2 for water quenching and granulating blast furnace slag, the granulating tank 2 is arranged at the tail end of a slag runner 1 for conveying the blast furnace slag, the blast furnace slag quenching steam whitening device further comprises a dehydration rotary drum 16 and a cooling tower 18, a slag-water mixture generated by water quenching and granulating the blast furnace slag flows to the dehydration rotary drum 16 from the bottom of the steam gathering area, the top of the dehydration rotary drum 16 is communicated with the lower part of a steam condensing tower 4, the bottom of the dehydration rotary drum 16 is provided with a hot water tank 17, the hot water tank 17 is communicated with a water inlet of the cooling tower 18 through a pipeline and a water return pump 19, and a water outlet of the cooling tower 18 is communicated with the granulating tank 2 through a pipeline and a water supply pump 20. Be equipped with water spray set 3 in the steam condensation zone, water spray set 3 below is equipped with return water collection device 5, and steam condensing tower 4 is equipped with wet return 15 outward, return water collection device 5 passes through wet return 15 with hot-water tank 17 intercommunication, the spray water that water spray set 3 produced and steam condensate water pass through return water collection device 5 and collect, blast furnace quenching sediment steam white elimination device still includes sediment processing system make-up water system 24, and water spray set 3 and hot-water tank 17 all communicate with sediment processing system make-up water system 24. The invention provides a blast furnace quenching slag steam whitening process and a device, which have the characteristics of energy saving and water saving, and can realize an ideal whitening effect under the working condition of quenching slag steam amount fluctuation.
As shown in fig. 1, the blast furnace slag falls down at the end of the slag runner 1, and granulated water 21 is ejected from the granulation tank 2 to perform slag flushing, granulation, and water quenching. The slag-water mixture enters the bottom of the steam condensation tower 4, then flows to the dehydration rotary drum 16 for slag-water separation, and the slag-flushing hot water enters the hot water tank 17. In the process, a large amount of quenching slag steam is generated along with the slag meeting water. The upper part of the steam condensation tower 4 is a steam condensation area, the lower part is a steam gathering area, and the top of the dehydration rotary drum 16 is communicated with the lower part of the steam condensation tower 4.
And introducing quenching slag steam 8 to a heat exchanger 6 from a steam accumulation area at the lower part of the steam condensation tower 4 by using a steam fan 7, introducing air 10 to the heat exchanger 6 by using an air fan 9, mixing the heat-exchanged steam 11 with hot air 12, and discharging the mixed steam into the atmosphere 23 to realize steam whitening. And heat exchange condensate water 13 generated by steam phase change in the heat exchanger 6 is sent to a hot water tank 17 through a water return pipe 15.
When the amount of the blast furnace slag is large and the generated steam amount exceeds the air entraining capacity of the steam fan 7, the excessive steam enters the upper part of the steam condensation tower 4 and is sprayed with the condensed steam from the water spraying device 3, so that the steam whitening is realized. The sprayed water and the steam condensate are collected by the backwater collecting device 5 and then sent to the hot water tank 17 through the backwater pipe 15. The spray water 14 is supplied by a slag treatment system makeup water system 24, and when the consumption of the spray water 14 is not large, the slag treatment system can be directly replenished with water through the makeup water pipe 22.
After being precipitated, the hot water in the hot water tank 17 is sent to a cooling tower 18 for cooling through a water return pump 19, and then the granulation water 21 is sent to the granulation tank 2 through a water supply pump 20.
At 2500-3200 m3For example, in the process of white elimination by blast furnace quenching slag steam, when the blast furnace is normally produced, the average quenching slag steam amount is 15-18 ten thousand Nm3H, maximum 35 ten thousand Nm3H is used as the reference value. In order to adapt to most production working conditions, the capacity of the steam fan is set to be 0.6-0.8 times of the maximum steam quantity, and the excess steam is 0.2-0.4 times of the maximum steam quantity.
The temperature of steam entering the heat exchanger is 80-90 ℃, the temperature of steam after heat exchange is 70-80 ℃, and the temperature of air after heat exchange is 65-75 ℃.
The steam spraying water adopts the water supplement of a slag treatment water system, the average spraying water amount is 200 t/h-600 t/h, the water quality is industrial purified water, the water pressure is 0.5-0.8 MPa, and the water temperature is normal temperature.
After the hot water in the hot water tank is pumped to the cooling tower by the backwater pump for cooling, the hot water is pumped to the granulation tank by the water supply pump for granulating and flushing slag, the circulating water amount is about 2000t/h, and the water supply temperature of the cooling tower is about 45 ℃.
The novel quenching slag steam whitening process adopts two different steam whitening methods for parallel treatment so as to adapt to the working condition of fluctuation of quenching slag steam quantity: one path is a main steam whitening process and is used for treating most of quenching slag steam generated under the condition of general production working conditions, a fan is adopted to introduce the steam into a heat exchanger to exchange heat with air, and the heated air and the steam after heat exchange are mixed and discharged to realize whitening; the other path is a steam whitening auxiliary process which is used for treating excessive quenching slag steam generated under the production working condition with large slag amount, and the excessive steam is condensed in a water spraying mode to realize whitening elimination.
The two paths of steam treatment can independently realize the steam whitening function, wherein the main steam whitening process runs synchronously with the slag discharge of the blast furnace, and the auxiliary steam whitening process runs only when the quenching slag steam is excessive.
The main steam white elimination process utilizes the waste heat of steam to heat air, reduces the steam temperature and the saturated humidity, and then utilizes the hot air to be mixed with the steam after heat exchange, so that the humidity of the mixed gas is lower than that of the air, and the mixed gas is discharged into the ambient atmosphere, and no white smoke is generated. The heat exchange condensate water generated by the steam whitening main process is introduced into the hot water tank to participate in the water circulation of the slag treatment system.
The steam whitening auxiliary process adopts atomized water drops to directly spray and cool steam and condense the steam. The steam condensate water generated by the steam whitening auxiliary process and the spray backwater are introduced into the hot water tank to participate in the water circulation of the slag treatment system.
The two white-removing processes can independently realize the function of steam white-removing, the tail gas of the two white-removing processes can be independently discharged, and the two tail gases can also be mixed and discharged to the atmosphere.
The main steam whitening process runs synchronously with the slag tapping of the blast furnace, and the quenching slag steam is continuously whitened in the slag tapping process of the blast furnace. The air entraining capacity of the steam fan is set to be 0.6-0.8 times of the maximum steam generation amount.
The steam white elimination auxiliary process is used for spraying and condensing excessive steam in the slag discharging process of the blast furnace, and can be operated discontinuously, wherein the excessive steam is higher than the air entraining capacity of a steam fan. The treatment amount of the spraying condensation steam is set to be 0.2-0.4 times of the maximum steam amount.
The steam whitening auxiliary process does not use the return water of the cooling tower as spray water, but uses the water supplement of the slag treatment water system as steam spray water, and the average spray water amount is 200 t/h-600 t/h.
When the consumption of the spray water is not large, the slag treatment water system can be directly supplemented with water through the water supplementing pipe 22.
The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention, and any modifications, equivalents, improvements and the like that fall within the spirit and principle of the present invention are intended to be included therein.
Claims (10)
1. A blast furnace quenching slag steam whitening process is characterized by comprising the following steps: s1, the blast furnace slag falls down at the tail end of the slag runner, and the granulating water is sprayed out from the granulating tank for slag flushing, granulating and water quenching; s2, enabling the slag-water mixture to enter the bottom of a steam condensation tower, then flowing to a dehydration rotary drum for slag-water separation, and enabling slag flushing hot water to enter a hot water tank; s3, in the steps S1 and S2, a large amount of quenching slag steam is generated along with molten slag meeting water, the quenching slag steam is processed in parallel by two different steam whitening methods, one steam whitening method is a main steam whitening process, quenching slag steam is introduced into a heat exchanger by a steam fan to exchange heat with air, heated hot air and steam after heat exchange are mixed and discharged, and whitening is achieved; the other path is a steam whitening auxiliary process, and quenching slag steam is condensed in a water spraying mode to realize whitening.
2. The blast furnace slag steam whitening process as defined in claim 1, characterized in that: in step S3, the main steam whitening process includes introducing the quenching slag steam from the lower steam gathering zone of the steam condensing tower to the heat exchanger by the steam blower, introducing air to the heat exchanger by the air blower, mixing the heat-exchanged steam and hot air, and exhausting the mixture to the atmosphere to achieve steam whitening.
3. The blast furnace slag steam whitening process as set forth in claim 2, characterized in that: and heat exchange condensate water generated by steam phase change in the heat exchanger is sent to the hot water tank through the water return pipe.
4. The blast furnace slag steam whitening process as defined in claim 1, characterized in that: in step S3, when the amount of the generated slag quenching steam exceeds the air-entraining capacity of the steam blower, the excess slag quenching steam enters the upper steam condensation area of the steam condensation tower, and the water spraying device sprays the condensed slag quenching steam to realize steam whitening.
5. The blast furnace slag steam whitening process of claim 4, characterized in that: the sprayed water and the steam condensate are collected by a backwater collecting device in the steam condensing tower and then are sent to the hot water tank through a backwater pipe.
6. The blast furnace slag steam whitening process of claim 4, characterized in that: the spraying water provided for the water spraying device is supplied by a slag treatment system water replenishing system, and the slag treatment system water replenishing system is provided with a water replenishing pipe communicated with a hot water tank and can directly replenish water for the slag treatment water system.
7. The blast furnace slag steam whitening process as defined in claim 1, characterized in that: in step S2, the hot water in the hot water tank is precipitated, sent to a cooling tower for cooling by a return water pump, and sent to a granulation tank by a water supply pump.
8. The utility model provides a white device of blast furnace quenching sediment steam that disappears which characterized in that: the blast furnace quenching slag steam white eliminating device comprises a heat exchanger and a steam condensing tower, wherein the heat exchanger is positioned outside the steam condensing tower, the steam condensing tower comprises a steam condensing area positioned above and a steam gathering area positioned below, the quenching slag steam in the steam gathering area is pumped into a steam fan of the heat exchanger, air is pumped into an air fan of the heat exchanger, and a discharge pipe is used for mixing and discharging steam and hot air after heat exchange into the atmosphere.
9. The blast furnace slag steam whitening apparatus of claim 8, characterized in that: the steam gathering area is provided with a granulating box for water quenching and granulating blast furnace slag, the granulating box is arranged at the tail end of a slag channel for conveying the blast furnace slag, the blast furnace slag quenching steam whitening device further comprises a dehydration rotary drum and a cooling tower, a slag-water mixture generated by water quenching and granulating of the blast furnace slag flows to the dehydration rotary drum from the bottom of the steam gathering area, the top of the dehydration rotary drum is communicated with the lower part of a steam condensing tower, the bottom of the dehydration rotary drum is provided with a hot water tank, the hot water tank is communicated with a water inlet of the cooling tower through a pipeline and a water return pump, and a water outlet of the cooling tower is communicated with the granulating box through a pipeline and a water supply pump.
10. The blast furnace slag steam whitening apparatus of claim 9, characterized in that: the blast furnace slag quenching steam whitening device comprises a steam condensation zone, a water spray device, a water return collecting device, a water return pipe, a water return collecting device, a slag treatment system water supplementing system, a water spray device and a hot water tank, wherein the water spray device is arranged in the steam condensation zone, the water return collecting device is arranged below the water spray device, the water return pipe is arranged outside the steam condensation tower, the water return collecting device is communicated with the hot water tank through the water return pipe, spray water and steam condensate water generated by the water spray device are collected through the water return collecting device, the blast furnace slag quenching steam whitening device further comprises a slag treatment system water supplementing system, and the water spray device and the hot water tank are communicated with the slag treatment system water supplementing system.
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