CN113945099A - Electric furnace flue gas waste heat utilization method and system - Google Patents
Electric furnace flue gas waste heat utilization method and system Download PDFInfo
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- CN113945099A CN113945099A CN202111288164.5A CN202111288164A CN113945099A CN 113945099 A CN113945099 A CN 113945099A CN 202111288164 A CN202111288164 A CN 202111288164A CN 113945099 A CN113945099 A CN 113945099A
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- 239000003546 flue gas Substances 0.000 title claims abstract description 282
- UGFAIRIUMAVXCW-UHFFFAOYSA-N Carbon monoxide Chemical compound [O+]#[C-] UGFAIRIUMAVXCW-UHFFFAOYSA-N 0.000 title claims abstract description 281
- 239000002918 waste heat Substances 0.000 title claims abstract description 92
- 238000000034 method Methods 0.000 title claims abstract description 36
- 239000000428 dust Substances 0.000 claims abstract description 169
- 238000007599 discharging Methods 0.000 claims abstract description 51
- 239000003344 environmental pollutant Substances 0.000 claims abstract description 45
- 231100000719 pollutant Toxicity 0.000 claims abstract description 45
- 239000002245 particle Substances 0.000 claims abstract description 44
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 31
- 239000000779 smoke Substances 0.000 claims abstract description 28
- 238000002485 combustion reaction Methods 0.000 claims abstract description 27
- 230000005611 electricity Effects 0.000 claims abstract description 12
- 238000010791 quenching Methods 0.000 claims description 33
- 230000000171 quenching effect Effects 0.000 claims description 30
- 238000001816 cooling Methods 0.000 claims description 18
- 239000012530 fluid Substances 0.000 claims description 14
- MWUXSHHQAYIFBG-UHFFFAOYSA-N nitrogen oxide Inorganic materials O=[N] MWUXSHHQAYIFBG-UHFFFAOYSA-N 0.000 claims description 12
- 239000007921 spray Substances 0.000 claims description 12
- 238000005507 spraying Methods 0.000 claims description 11
- RAHZWNYVWXNFOC-UHFFFAOYSA-N Sulphur dioxide Chemical compound O=S=O RAHZWNYVWXNFOC-UHFFFAOYSA-N 0.000 claims description 8
- HGUFODBRKLSHSI-UHFFFAOYSA-N 2,3,7,8-tetrachloro-dibenzo-p-dioxin Chemical compound O1C2=CC(Cl)=C(Cl)C=C2OC2=C1C=C(Cl)C(Cl)=C2 HGUFODBRKLSHSI-UHFFFAOYSA-N 0.000 claims description 4
- 230000009977 dual effect Effects 0.000 claims description 3
- 238000009628 steelmaking Methods 0.000 abstract description 32
- 229910052799 carbon Inorganic materials 0.000 abstract description 20
- 230000009286 beneficial effect Effects 0.000 abstract description 6
- 230000000694 effects Effects 0.000 abstract description 5
- 238000004064 recycling Methods 0.000 abstract description 5
- 238000004134 energy conservation Methods 0.000 abstract description 2
- 230000007613 environmental effect Effects 0.000 abstract description 2
- 230000008569 process Effects 0.000 description 15
- 238000005265 energy consumption Methods 0.000 description 9
- 239000008187 granular material Substances 0.000 description 6
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 3
- 230000009467 reduction Effects 0.000 description 3
- 238000010586 diagram Methods 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 239000007789 gas Substances 0.000 description 2
- 238000002156 mixing Methods 0.000 description 2
- 238000000746 purification Methods 0.000 description 2
- 238000003723 Smelting Methods 0.000 description 1
- 229910000831 Steel Inorganic materials 0.000 description 1
- 230000002349 favourable effect Effects 0.000 description 1
- 239000010812 mixed waste Substances 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000006386 neutralization reaction Methods 0.000 description 1
- 239000010959 steel Substances 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
- 239000002912 waste gas Substances 0.000 description 1
- 239000002699 waste material Substances 0.000 description 1
Images
Classifications
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F27—FURNACES; KILNS; OVENS; RETORTS
- F27D—DETAILS OR ACCESSORIES OF FURNACES, KILNS, OVENS, OR RETORTS, IN SO FAR AS THEY ARE OF KINDS OCCURRING IN MORE THAN ONE KIND OF FURNACE
- F27D17/00—Arrangements for using waste heat; Arrangements for using, or disposing of, waste gases
- F27D17/004—Systems for reclaiming waste heat
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01D—NON-POSITIVE DISPLACEMENT MACHINES OR ENGINES, e.g. STEAM TURBINES
- F01D15/00—Adaptations of machines or engines for special use; Combinations of engines with devices driven thereby
- F01D15/10—Adaptations for driving, or combinations with, electric generators
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F27—FURNACES; KILNS; OVENS; RETORTS
- F27D—DETAILS OR ACCESSORIES OF FURNACES, KILNS, OVENS, OR RETORTS, IN SO FAR AS THEY ARE OF KINDS OCCURRING IN MORE THAN ONE KIND OF FURNACE
- F27D17/00—Arrangements for using waste heat; Arrangements for using, or disposing of, waste gases
- F27D17/008—Arrangements for using waste heat; Arrangements for using, or disposing of, waste gases cleaning gases
-
- 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
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P10/00—Technologies related to metal processing
- Y02P10/25—Process efficiency
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Environmental & Geological Engineering (AREA)
- Waste-Gas Treatment And Other Accessory Devices For Furnaces (AREA)
Abstract
The invention discloses a method and a device for utilizing the waste heat of flue gas of an electric furnace, belonging to the technical field of energy conservation and environmental protection of electric furnace steelmaking, and comprising the steps of discharging high-temperature flue gas discharged from a secondary combustion chamber of the electric furnace into a cyclone dust collector for large-particle dust removal; discharging the high-temperature flue gas subjected to large-particle dust removal into a waste heat boiler, and adding demineralized water into the waste heat boiler to generate high-temperature steam and cooled high-temperature flue gas; delivering the high-temperature steam to a steam turbine for the steam turbine to do work to generate electricity; discharging the cooled high-temperature flue gas into a flue gas treatment device to remove pollutants so as to obtain the flue gas from which the pollutants are removed; discharging the smoke from which the pollutants are removed into a bag-type dust remover through a cyclone air mixer to remove dust so as to obtain the smoke from which the dust is removed; and discharging the flue gas after dust removal into a chimney through a draught fan for discharging. The invention achieves the technical effects of effectively recycling the waste heat of the flue gas and being beneficial to the green and low-carbon development of electric furnace steelmaking.
Description
Technical Field
The invention belongs to the technical field of energy conservation and environmental protection of electric furnace steelmaking, and particularly relates to a method and a system for utilizing flue gas waste heat of an electric furnace.
Background
With the proposal of carbon peak reaching and carbon neutralization targets, the short-process electric furnace steelmaking proportion of the steel industry in China will gradually increase in the future. A large amount of high-temperature dust-containing flue gas can be generated in the electric furnace steelmaking process, and the sensible heat of the flue gas accounts for more than 10% of the total energy consumption of the electric furnace steelmaking.
At present, in the existing energy-saving and environment-friendly technology of electric furnace steelmaking, high-temperature flue gas is cooled by adopting a water cooling mode, primary flue gas generated by smelting can pass through an air cooler or a spray cooling tower after being cooled by a water-cooling elbow, a water-cooling sliding sleeve, a combustion settling chamber and a water-cooling flue, and is finally mixed with secondary waste gas from a large closed cover and a roof dust hood, the mixed waste gas is purified by a dust remover and then discharged to the atmosphere, and the cooling and dust removing functions of the electric furnace flue gas are realized. However, in the process of cooling by adopting a water cooling mode, the heat of a large amount of high-temperature flue gas cannot be recycled, so that the energy consumption is greatly wasted, and the green and low-carbon development of electric furnace steelmaking is not facilitated.
In conclusion, in the existing energy-saving and environment-friendly technology for electric furnace steelmaking, the heat of high-temperature flue gas cannot be recycled, and the technical problem of the environmental-friendly and low-carbon development of electric furnace steelmaking is not facilitated.
Disclosure of Invention
The invention aims to solve the technical problems that the heat of high-temperature flue gas cannot be recycled and is not beneficial to the green and low-carbon development of electric furnace steelmaking.
In order to solve the technical problem, the invention provides a method for utilizing the waste heat of the flue gas of an electric furnace, which comprises the following steps: discharging high-temperature flue gas discharged from a secondary combustion chamber of the electric furnace into a cyclone dust collector for large-particle dust removal; discharging the high-temperature flue gas subjected to large-particle dust removal into a waste heat boiler, and adding demineralized water into the waste heat boiler to generate high-temperature steam and cooled high-temperature flue gas; delivering the high-temperature steam to a steam turbine for the steam turbine to do work to generate electricity; discharging the cooled high-temperature flue gas into a flue gas treatment device to remove pollutants so as to obtain the flue gas from which the pollutants are removed; discharging the smoke from which the pollutants are removed into a bag-type dust remover through a cyclone air mixer to remove dust so as to obtain the smoke from which the dust is removed; and discharging the flue gas after dust removal into a chimney through a draught fan for discharging.
Further, still include after discharging the high temperature flue gas that discharges in the electric stove afterburning chamber into cyclone and carrying out the large granule dust removal: and discharging the high-temperature flue gas subjected to large particle dust removal into an emergency flue gas quenching tower for spraying to obtain the cooled high-temperature flue gas.
Further, the high temperature flue gas after will carrying out the large granule dust removal is discharged and is sprayed the cooling in urgent flue gas quench tower to the high temperature flue gas after obtaining the cooling includes: discharging the high-temperature flue gas subjected to large particle dust removal into an emergency flue gas quenching tower; and spraying and cooling the high-temperature flue gas through a spray head of a multi-stage spraying system in the emergency flue gas quenching tower to obtain the cooled high-temperature flue gas.
Further, the spray head adopts double fluids or single fluid to spray and cool the high-temperature flue gas; the dual fluid includes water and air, and the single fluid includes water.
Further, the high temperature flue gas after will carrying out the large granule dust removal is discharged into exhaust-heat boiler, and adds demineralized water in exhaust-heat boiler, still includes after producing the high temperature flue gas after high temperature steam and the cooling: and conveying the high-temperature steam to a pipe network in the plant.
Further, the pollutants comprise dioxin, sulfur dioxide and nitrogen oxides.
According to another aspect of the present invention, the present invention also provides an electric furnace flue gas waste heat utilization system, including: the electric furnace secondary combustion chamber is connected with the cyclone dust collector so as to discharge high-temperature flue gas discharged from the electric furnace secondary combustion chamber into the cyclone dust collector for large-particle dust removal; the cyclone dust collector is connected with the waste heat boiler, the high-temperature flue gas subjected to large-particle dust removal is discharged into the waste heat boiler, and demineralized water is added into the waste heat boiler to generate high-temperature steam and cooled high-temperature flue gas; delivering the high-temperature steam to a steam turbine for the steam turbine to do work to generate electricity; the waste heat boiler is connected with the flue gas treatment device so as to discharge the cooled high-temperature flue gas into the flue gas treatment device to remove pollutants, so as to obtain the flue gas from which the pollutants are removed; the smoke treatment device is connected with the cyclone air mixer, the cyclone air mixer is connected with the bag-type dust remover, so that the smoke from which the pollutants are removed is discharged into the bag-type dust remover through the cyclone air mixer to remove dust, and the smoke from which the dust is removed is obtained; the bag-type dust remover is connected with the induced draft fan, and the induced draft fan is connected with the flue gas so as to discharge the flue gas after dust removal into a chimney through the induced draft fan for discharge.
Further, the system further comprises: the first inlet valve is arranged between the cyclone dust collector and the waste heat boiler; the first outlet valve is arranged between the waste heat boiler and the flue gas treatment device; the input valve is arranged between the bag-type dust collector and the induced draft fan; and the output valve is arranged between the induced draft fan and the chimney.
Further, the system further comprises: the emergency flue gas quenching tower is connected with the cyclone dust collector, and the emergency flue gas quenching tower is connected with the flue gas treatment device.
Further, the system further comprises: the second inlet valve is arranged between the cyclone dust collector and the emergency flue gas quenching tower; and the second outlet valve is arranged between the emergency flue gas quenching tower and the flue gas treatment device.
Has the advantages that:
the invention provides a method for utilizing flue gas waste heat of an electric furnace, which is characterized in that high-temperature flue gas discharged from a secondary combustion chamber of the electric furnace is discharged into a cyclone dust collector for large-particle dust removal; discharging the high-temperature flue gas subjected to large-particle dust removal into a waste heat boiler, and adding demineralized water into the waste heat boiler to generate high-temperature steam and cooled high-temperature flue gas; delivering the high-temperature steam to a steam turbine for the steam turbine to do work to generate electricity; discharging the cooled high-temperature flue gas into a flue gas treatment device to remove pollutants so as to obtain the flue gas from which the pollutants are removed; discharging the smoke from which the pollutants are removed into a bag-type dust remover through a cyclone air mixer to remove dust so as to obtain the smoke from which the dust is removed; and discharging the flue gas after dust removal into a chimney through a draught fan for discharging. In the process of steelmaking of the electric furnace, large-particle dust removal is carried out through the cyclone dust collector, pollutants are removed through the smoke treatment device, dust is removed through the bag-type dust collector, and high-temperature smoke discharged from the secondary combustion chamber of the electric furnace is purified. Meanwhile, in the process of purifying the high-temperature flue gas, demineralized water can be added into the waste heat boiler, high-temperature steam generated after the high-temperature flue gas is discharged into the waste heat boiler is conveyed to the steam turbine to do work and generate power, so that the heat of a large amount of high-temperature flue gas is recycled, the energy consumption waste is reduced, and the green low-carbon development of electric furnace steel making is facilitated. And then, the flue gas waste heat can be effectively recycled in the process of purifying the flue gas, and the green and low-carbon development of electric furnace steelmaking is facilitated. Thereby achieving the technical effects of effectively recycling the waste heat of the flue gas and being beneficial to the green and low-carbon development of electric furnace steelmaking.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings needed in the embodiments will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings without creative efforts.
FIG. 1 is a flow chart of a method for utilizing the waste heat of flue gas of an electric furnace according to an embodiment of the present invention;
fig. 2 is a schematic diagram of an electric furnace flue gas waste heat utilization system provided by an embodiment of the invention.
Detailed Description
The invention discloses a method for utilizing the flue gas waste heat of an electric furnace, which comprises the steps of discharging high-temperature flue gas discharged from a secondary combustion chamber 1 of the electric furnace into a cyclone dust collector 2 for large-particle dust removal; discharging the high-temperature flue gas subjected to large particle dust removal into the waste heat boiler 3, and adding demineralized water into the waste heat boiler 3 to generate high-temperature steam and cooled high-temperature flue gas; delivering the high-temperature steam to a steam turbine for the steam turbine to do work to generate electricity; discharging the cooled high-temperature flue gas into a flue gas treatment device 4 to remove pollutants so as to obtain the flue gas from which the pollutants are removed; discharging the smoke from which the pollutants are removed into a bag-type dust remover 6 through a cyclone air mixer 5 to remove dust so as to obtain the smoke from which the dust is removed; and discharging the flue gas after dust removal into a chimney 15 through a draught fan 7 for discharging. In the process of steelmaking of the electric furnace, large-particle dedusting is carried out through the cyclone dust collector 2, pollutants are removed through the smoke treatment device 4, dust is removed through the bag-type dust collector 6, and high-temperature smoke discharged from the electric furnace secondary combustion chamber 1 is purified. Meanwhile, in the process of purifying high-temperature flue gas, demineralized water can be added into the waste heat boiler 3, high-temperature steam generated after the high-temperature flue gas is discharged into the waste heat boiler 3 is conveyed to the steam turbine to do work and generate power, so that the heat of a large amount of high-temperature flue gas is recycled, the energy consumption is reduced, and the green low-carbon development of electric furnace steelmaking is facilitated. And then, the flue gas waste heat can be effectively recycled in the process of purifying the flue gas, and the green and low-carbon development of electric furnace steelmaking is facilitated. Thereby achieving the technical effects of effectively recycling the waste heat of the flue gas and being beneficial to the green and low-carbon development of electric furnace steelmaking.
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 obtained by a person of ordinary skill in the art based on the embodiments of the present invention belong to the protection scope of the present invention; the "and/or" keyword referred to in this embodiment represents sum or two cases, in other words, a and/or B mentioned in the embodiment of the present invention represents two cases of a and B, A or B, and describes three states where a and B exist, such as a and/or B, which represents: only A does not include B; only B does not include A; including A and B.
It will be understood that, although the terms first, second, etc. may be used herein to describe various elements, components, regions, layers and/or sections, these elements, components, regions, layers and/or sections should not be limited by these terms. These terms are only used to distinguish one element, component, region, layer or section from another element, component, region, layer or section. Thus, a first element, component, region, layer or section discussed below could be termed a second element, component, region, layer or section without departing from the teachings of the example embodiments. Spatially relative terms, such as "below," "above," and the like, may be used herein to facilitate describing one element or feature's relationship to another element or feature. It will be understood that the spatially relative terms are intended to encompass different orientations of the device in use or operation in addition to the orientation depicted in the figures. For example, if the device in the figures is turned over, elements or features described as "lower" would then be oriented "upper" other elements or features. Thus, the exemplary term "below" can encompass both an orientation of above and below. The device may be oriented (rotated 90 degrees or at other orientations) and the spatially relative descriptors used herein interpreted accordingly.
Also, in embodiments of the invention where an element is referred to as being "secured to" another element, it can be directly on the other element or intervening elements may also be present. When a component is referred to as being "connected" to another component, it can be directly connected to the other component or intervening components may also be present. When a component is referred to as being "disposed on" another component, it can be directly on the other component or intervening components may also be present. The terms "vertical," "horizontal," "left," "right," and the like as used in the embodiments of the present invention are for illustrative purposes only and are not intended to limit the present invention.
Example one
Referring to fig. 1 and fig. 2, fig. 1 is a flowchart of a method for utilizing waste heat of flue gas of an electric furnace according to an embodiment of the present invention, and fig. 2 is a schematic diagram of a system for utilizing waste heat of flue gas of an electric furnace according to an embodiment of the present invention, where the method for utilizing waste heat of flue gas of an electric furnace according to an embodiment of the present invention includes the following steps:
step S100, discharging high-temperature flue gas discharged from the electric furnace secondary combustion chamber 1 into a cyclone dust collector 2 for large-particle dust collection;
the high-temperature flue gas discharged from the electric furnace secondary combustion chamber 1 is discharged into the cyclone dust collector 2 for large-particle dust collection, and then the method further comprises the following steps: and discharging the high-temperature flue gas subjected to large particle dust removal into an emergency flue gas quenching tower 12 for spraying to obtain the cooled high-temperature flue gas. The high temperature flue gas after will carrying out the dust removal of large granule is discharged and is sprayed the cooling in urgent flue gas quench tower 12 to the high temperature flue gas after obtaining the cooling includes: discharging the high-temperature flue gas subjected to large particle dust removal into an emergency flue gas quenching tower 12; and (3) spraying and cooling the high-temperature flue gas through a spray head of a multi-stage spraying system in the emergency flue gas quenching tower 12 to obtain the cooled high-temperature flue gas. The spray head adopts double fluids or single fluid to spray and cool the high-temperature flue gas; the dual fluid includes water and air, and the single fluid includes water.
Specifically, a large amount of high-temperature dust-containing flue gas is generated in the electric furnace steel making process, the temperature range of the high-temperature flue gas is about 1000 ℃ to 1400 ℃, and the sensible heat of the flue gas accounts for more than 10% of the total energy consumption of the electric furnace steel making. When the exhaust-heat boiler 3 is in a normal operation state, the electric furnace secondary combustion chamber 1 is an electric furnace secondary combustion settling chamber, high-temperature flue gas discharged from the electric furnace secondary combustion chamber 1 can enter the cyclone dust collector 2, and large-particle dust is removed from the high-temperature flue gas through the cyclone dust collector 2. The high-temperature flue gas subjected to large particle dust removal is provided in the following step S110, and is discharged into the exhaust-heat boiler 3. When the exhaust-heat boiler 3 is in a fault or other emergency state, high-temperature flue gas discharged from the electric furnace secondary combustion chamber 1 enters the cyclone dust collector 2, after large-particle dust is removed from the high-temperature flue gas by the cyclone dust collector 2, the high-temperature flue gas from which the large-particle dust is removed can be discharged into the emergency flue gas quenching tower 12, and then the high-temperature flue gas is sprayed by the spray heads of the multi-stage spraying system installed in the emergency flue gas quenching tower 12, for example, the high-temperature flue gas is sprayed by two fluids of water and air, or the high-temperature flue gas is sprayed by a single fluid of water, and the high-temperature flue gas is cooled by spraying, so that the cooled high-temperature flue gas can enter the flue gas treatment device 4 of the following step S130.
A second inlet valve 13 may be provided between the cyclone 2 and the emergency flue gas quenching tower 12, and a pipeline connected between the cyclone 2 and the emergency flue gas quenching tower 12 is controlled to be in a closed or open state by the second inlet valve 13, for example, the second inlet valve 13 is opened, and the first inlet valve 8 described below is closed, so that the high-temperature flue gas after large-particle dust removal in the cyclone 2 is discharged into the emergency flue gas quenching tower 12. A second outlet valve 14 may be disposed between the emergency flue gas quenching tower 12 and the flue gas treatment device 4, and the pipeline connected between the emergency flue gas quenching tower 12 and the flue gas treatment device 4 is controlled to be in a closed or open state by the second outlet valve 14, for example, the second outlet valve 14 is opened, so that the high-temperature flue gas after being sprayed and cooled in the emergency flue gas quenching tower 12 is discharged into the flue gas treatment device 4.
Step S110, discharging the high-temperature flue gas subjected to large-particle dust removal into the waste heat boiler 3, and adding demineralized water into the waste heat boiler 3 to generate high-temperature steam and cooled high-temperature flue gas;
specifically, after the high temperature flue gas subjected to large particle dust removal is obtained in the above step S100, the high temperature flue gas subjected to large particle dust removal may be discharged into the exhaust heat boiler 3, and demineralized water is added into the exhaust heat boiler 3, and high temperature steam is generated by mixing the demineralized water and the high temperature flue gas, so as to provide the high temperature steam in the following step S120. Meanwhile, in the mixing process of the desalted water and the high-temperature flue gas, the high-temperature flue gas is cooled to provide the cooled high-temperature flue gas in the following step S130. A first inlet valve 8 can be arranged between the cyclone dust collector 2 and the waste heat boiler 3, the pipeline connected between the cyclone dust collector 2 and the waste heat boiler 3 is controlled to be in a closed or opened state through the first inlet valve 8, if the first inlet valve 8 is opened, high-temperature flue gas subjected to large-particle dust removal in the cyclone dust collector 2 is discharged into the waste heat boiler 3 through the pipeline, a first outlet valve 9 can be arranged between the waste heat boiler 3 and the flue gas treatment device 4, the channel connected between the waste heat boiler 3 and the flue gas treatment device 4 is controlled to be in a closed or opened state through the first outlet valve 9, if the first outlet valve 9 is opened, the high-temperature flue gas cooled in the waste heat boiler 3 is discharged into the gas treatment device 4.
Step S120, delivering the high-temperature steam to a steam turbine for the steam turbine to do work to generate electricity;
during exhaust-heat boiler 3 is discharged to the high temperature flue gas that will carry out behind the large granule dust removal, and add demineralized water in exhaust-heat boiler 3, still include after the high temperature flue gas after producing high-temperature steam and cooling: and conveying the high-temperature steam to a pipe network in the plant.
Specifically, after the high-temperature steam is obtained in the above steps S100 and S110, the high-temperature steam may be discharged into a turbine, and the high-temperature steam may be discharged into the turbine to apply work to generate power, or the high-temperature steam may be discharged into a plant pipe network to be recycled. Like this through with high temperature flue gas exhaust after 3 produced high temperature steam carry to the steam turbine in do work and generate electricity, perhaps carry high temperature steam to the inner tube net of factory and carry out recycle, realize carrying out recycle to the heat of a large amount of high temperature flue gas, it is extravagant to reduce the energy consumption, is favorable to the green low carbon development of electric stove steelmaking. And then, the flue gas waste heat can be effectively recycled in the process of purifying the flue gas, and the green and low-carbon development of electric furnace steelmaking is facilitated.
Step S130, discharging the cooled high-temperature flue gas into a flue gas treatment device 4 to remove pollutants so as to obtain the flue gas from which the pollutants are removed; the pollutants include dioxin, sulfur dioxide and nitrogen oxides.
Specifically, after the high-temperature flue gas after temperature reduction is obtained in step S110, the high-temperature flue gas after temperature reduction may be discharged into the flue gas treatment device 4, and the high-temperature flue gas after temperature reduction is discharged into the flue gas treatment device 4 to remove pollutants such as dioxin, sulfur dioxide, and nitrogen oxide in the high-temperature flue gas, so that the flue gas after removal of the pollutants may be provided in step S140 described below.
Step S140, discharging the flue gas from which the pollutants are removed into a bag-type dust remover 6 through a cyclone air mixer 5 to remove dust so as to obtain the flue gas from which the dust is removed;
specifically, after the flue gas from which the pollutants are removed is obtained in step S130, the flue gas from which the pollutants are removed may be discharged into the bag-type dust collector 6 by using the cyclone air mixer 5, and the dust in the flue gas is removed by using the bag-type dust collector 6, so as to provide the flue gas from which the dust is removed in step S150. An input valve 10 can be arranged between the bag-type dust collector 6 and the induced draft fan 7, the pipeline connected between the bag-type dust collector 6 and the induced draft fan 7 can be controlled to be in a closed or open state through the input valve 10, and if the input valve 10 is opened, smoke in the bag-type dust collector 6 after dust removal can enter the induced draft fan 7.
And S150, discharging the flue gas after dust removal into a chimney 15 through a draught fan 7 for discharging.
Specifically, the flue gas from which the dust is removed is obtained through the steps S100, S110, S120, S130 and S140, and then the flue gas from which the dust is removed can be discharged into the chimney 15 through the induced draft fan 7. If an output valve 11 can be arranged between the induced draft fan 7 and the chimney 15, the pipeline connected between the induced draft fan 7 and the chimney 15 can be controlled to be in a closed or open state through the output valve 11, and if the output valve 11 is opened, the smoke with dust removed is discharged into the chimney 15 through the induced draft fan 7 to be discharged. Then realized in the electric stove steelmaking process, carried out the large granule through cyclone 2 and removed dust, the pollutant is detached to flue gas processing apparatus 4, and the dust is detached to sack cleaner 6, comes to carry out purification treatment to the high temperature flue gas of discharging in electric stove postcombustion chamber 1 to and when carrying out purification treatment to high temperature flue gas, carry out recycle to the heat of a large amount of high temperature flue gases, it is extravagant to reduce the energy consumption.
The invention provides a method for utilizing the flue gas waste heat of an electric furnace, which is characterized in that high-temperature flue gas discharged from a secondary combustion chamber 1 of the electric furnace is discharged into a cyclone dust collector 2 for large-particle dust removal; discharging the high-temperature flue gas subjected to large particle dust removal into the waste heat boiler 3, and adding demineralized water into the waste heat boiler 3 to generate high-temperature steam and cooled high-temperature flue gas; delivering the high-temperature steam to a steam turbine for the steam turbine to do work to generate electricity; discharging the cooled high-temperature flue gas into a flue gas treatment device 4 to remove pollutants so as to obtain the flue gas from which the pollutants are removed; discharging the smoke from which the pollutants are removed into a bag-type dust remover 6 through a cyclone air mixer 5 to remove dust so as to obtain the smoke from which the dust is removed; and discharging the flue gas after dust removal into a chimney 15 through a draught fan 7 for discharging. In the process of steelmaking of the electric furnace, large-particle dedusting is carried out through the cyclone dust collector 2, pollutants are removed through the smoke treatment device 4, dust is removed through the bag-type dust collector 6, and high-temperature smoke discharged from the electric furnace secondary combustion chamber 1 is purified. Meanwhile, in the process of purifying high-temperature flue gas, demineralized water can be added into the waste heat boiler 3, high-temperature steam generated after the high-temperature flue gas is discharged into the waste heat boiler 3 is conveyed to the steam turbine to do work and generate power, so that the heat of a large amount of high-temperature flue gas is recycled, the energy consumption is reduced, and the green low-carbon development of electric furnace steelmaking is facilitated. And then, the flue gas waste heat can be effectively recycled in the process of purifying the flue gas, and the green and low-carbon development of electric furnace steelmaking is facilitated. Thereby achieving the technical effects of effectively recycling the waste heat of the flue gas and being beneficial to the green and low-carbon development of electric furnace steelmaking.
In order to describe the electric furnace flue gas waste heat utilization system in detail, the embodiment describes the electric furnace flue gas waste heat utilization method in detail, and based on the same inventive concept, the application also provides an electric furnace flue gas waste heat utilization system, which is described in the second embodiment in detail.
Example two
The embodiment of the invention provides an electric furnace flue gas waste heat utilization system, which comprises an electric furnace secondary combustion chamber 1 and a cyclone dust collector 2, wherein the electric furnace secondary combustion chamber 1 is connected with the cyclone dust collector 2 so as to discharge high-temperature flue gas discharged from the electric furnace secondary combustion chamber 1 into the cyclone dust collector 2 for large-particle dust collection; the cyclone dust collector 2 is connected with the waste heat boiler 3, high-temperature flue gas subjected to large-particle dust removal is discharged into the waste heat boiler 3, and desalted water is added into the waste heat boiler 3 to generate high-temperature steam and cooled high-temperature flue gas; delivering the high-temperature steam to a steam turbine for the steam turbine to do work to generate electricity; the waste heat boiler 3 is connected with the flue gas treatment device 4 so as to discharge the cooled high-temperature flue gas into the flue gas treatment device 4 to remove pollutants, so as to obtain the flue gas from which the pollutants are removed; the flue gas treatment device 4 is connected with the cyclone air mixer 5, the cyclone air mixer 5 is connected with the bag-type dust remover 6, so that the flue gas from which the pollutants are removed is discharged into the bag-type dust remover 6 through the cyclone air mixer 5 to remove the dust, and the flue gas from which the dust is removed is obtained; the bag-type dust collector 6 is connected with the induced draft fan 7, and the induced draft fan 7 is connected with the flue gas, so that the flue gas after dust removal is discharged into the chimney 15 through the induced draft fan 7 for discharge.
The second embodiment of the invention provides an electric furnace flue gas waste heat utilization system, which further comprises a first inlet valve 8, a first outlet valve 9, an input valve 10, an output valve 11, an emergency flue gas quenching tower 12, a second inlet valve 13 and a second outlet valve 14, wherein the first inlet valve 8 is arranged between the cyclone dust collector 2 and the waste heat boiler 3; the first outlet valve 9 is arranged between the waste heat boiler 3 and the flue gas treatment device 4; the input valve 10 is arranged between the bag-type dust collector 6 and the induced draft fan 7; the output valve 11 is arranged between the induced draft fan 7 and the chimney 15. The emergency flue gas quenching tower 12 is connected with the cyclone dust collector 2, and the emergency flue gas quenching tower 12 is connected with the flue gas treatment device 4. The second inlet valve 13 is arranged between the cyclone dust collector 2 and the emergency flue gas quenching tower 12; the second outlet valve 14 is disposed between the emergency flue gas quench tower 12 and the flue gas treatment device 4.
The invention provides a flue gas waste heat utilization system of an electric furnace, which is characterized in that an electric furnace secondary combustion chamber 1 is connected with a cyclone dust collector 2, so that high-temperature flue gas discharged from the electric furnace secondary combustion chamber 1 is discharged into the cyclone dust collector 2 for large-particle dust removal; the cyclone dust collector 2 is connected with the waste heat boiler 3, high-temperature flue gas subjected to large-particle dust removal is discharged into the waste heat boiler 3, and desalted water is added into the waste heat boiler 3 to generate high-temperature steam and cooled high-temperature flue gas; delivering the high-temperature steam to a steam turbine for the steam turbine to do work to generate electricity; the waste heat boiler 3 is connected with the flue gas treatment device 4 so as to discharge the cooled high-temperature flue gas into the flue gas treatment device 4 to remove pollutants, so as to obtain the flue gas from which the pollutants are removed; the flue gas treatment device 4 is connected with the cyclone air mixer 5, the cyclone air mixer 5 is connected with the bag-type dust remover 6, so that the flue gas from which the pollutants are removed is discharged into the bag-type dust remover 6 through the cyclone air mixer 5 to remove the dust, and the flue gas from which the dust is removed is obtained; the bag-type dust collector 6 is connected with the induced draft fan 7, and the induced draft fan 7 is connected with the flue gas, so that the flue gas after dust removal is discharged into the chimney 15 through the induced draft fan 7 for discharge. In the process of steelmaking of the electric furnace, large-particle dedusting is carried out through the cyclone dust collector 2, pollutants are removed through the smoke treatment device 4, dust is removed through the bag-type dust collector 6, and high-temperature smoke discharged from the electric furnace secondary combustion chamber 1 is purified. Meanwhile, in the process of purifying high-temperature flue gas, demineralized water can be added into the waste heat boiler 3, high-temperature steam generated after the high-temperature flue gas is discharged into the waste heat boiler 3 is conveyed to the steam turbine to do work and generate power, so that the heat of a large amount of high-temperature flue gas is recycled, the energy consumption is reduced, and the green low-carbon development of electric furnace steelmaking is facilitated. And then, the flue gas waste heat can be effectively recycled in the process of purifying the flue gas, and the green and low-carbon development of electric furnace steelmaking is facilitated. Thereby achieving the technical effects of effectively recycling the waste heat of the flue gas and being beneficial to the green and low-carbon development of electric furnace steelmaking.
Finally, it should be noted that the above embodiments are only for illustrating the technical solutions of the present invention and not for limiting, and although the present invention has been described in detail with reference to examples, it should be understood by those skilled in the art that modifications or equivalent substitutions may be made on the technical solutions of the present invention without departing from the spirit and scope of the technical solutions of the present invention, which should be covered by the claims of the present invention.
Claims (10)
1. The method for utilizing the waste heat of the flue gas of the electric furnace is characterized by comprising the following steps:
discharging high-temperature flue gas discharged from a secondary combustion chamber of the electric furnace into a cyclone dust collector for large-particle dust removal;
discharging the high-temperature flue gas subjected to large-particle dust removal into a waste heat boiler, and adding demineralized water into the waste heat boiler to generate high-temperature steam and cooled high-temperature flue gas;
delivering the high-temperature steam to a steam turbine for the steam turbine to do work to generate electricity;
discharging the cooled high-temperature flue gas into a flue gas treatment device to remove pollutants so as to obtain the flue gas from which the pollutants are removed;
discharging the smoke from which the pollutants are removed into a bag-type dust remover through a cyclone air mixer to remove dust so as to obtain the smoke from which the dust is removed;
and discharging the flue gas after dust removal into a chimney through a draught fan for discharging.
2. The method for utilizing the waste heat of the flue gas of the electric furnace according to claim 1, wherein after discharging the high-temperature flue gas discharged from the secondary combustion chamber of the electric furnace into a cyclone dust collector for large particle dust removal, the method further comprises the following steps:
and discharging the high-temperature flue gas subjected to large particle dust removal into an emergency flue gas quenching tower for spraying to obtain the cooled high-temperature flue gas.
3. The method for utilizing the waste heat of the flue gas of the electric furnace according to claim 2, wherein the step of discharging the high-temperature flue gas subjected to large particle dust removal into an emergency flue gas quenching tower for spray cooling to obtain the cooled high-temperature flue gas comprises the following steps:
discharging the high-temperature flue gas subjected to large particle dust removal into an emergency flue gas quenching tower;
and spraying and cooling the high-temperature flue gas through a spray head of a multi-stage spraying system in the emergency flue gas quenching tower to obtain the cooled high-temperature flue gas.
4. The electric furnace flue gas waste heat utilization method according to claim 3, characterized in that:
the spray head adopts double fluids or single fluid to spray and cool the high-temperature flue gas; the dual fluid includes water and air, and the single fluid includes water.
5. The method for utilizing the waste heat of the flue gas of the electric furnace according to claim 1, wherein the step of discharging the high-temperature flue gas subjected to large particle dust removal into the waste heat boiler, and the step of adding demineralized water into the waste heat boiler to generate high-temperature steam and cooled high-temperature flue gas further comprises the following steps:
and conveying the high-temperature steam to a pipe network in the plant.
6. The method for utilizing the waste heat of the flue gas of the electric furnace according to claim 1, characterized in that:
the pollutants include dioxin, sulfur dioxide and nitrogen oxides.
7. The utility model provides an electric stove flue gas waste heat utilization system which characterized in that, the system includes:
the electric furnace secondary combustion chamber is connected with the cyclone dust collector so as to discharge high-temperature flue gas discharged from the electric furnace secondary combustion chamber into the cyclone dust collector for large-particle dust removal;
the cyclone dust collector is connected with the waste heat boiler, the high-temperature flue gas subjected to large-particle dust removal is discharged into the waste heat boiler, and demineralized water is added into the waste heat boiler to generate high-temperature steam and cooled high-temperature flue gas; delivering the high-temperature steam to a steam turbine for the steam turbine to do work to generate electricity;
the waste heat boiler is connected with the flue gas treatment device so as to discharge the cooled high-temperature flue gas into the flue gas treatment device to remove pollutants, so as to obtain the flue gas from which the pollutants are removed;
the smoke treatment device is connected with the cyclone air mixer, the cyclone air mixer is connected with the bag-type dust remover, so that the smoke from which the pollutants are removed is discharged into the bag-type dust remover through the cyclone air mixer to remove dust, and the smoke from which the dust is removed is obtained;
the bag-type dust remover is connected with the induced draft fan, and the induced draft fan is connected with the flue gas so as to discharge the flue gas after dust removal into a chimney through the induced draft fan for discharge.
8. The electric furnace flue gas waste heat utilization system of claim 7, further comprising:
the first inlet valve is arranged between the cyclone dust collector and the waste heat boiler;
the first outlet valve is arranged between the waste heat boiler and the flue gas treatment device;
the input valve is arranged between the bag-type dust collector and the induced draft fan;
and the output valve is arranged between the induced draft fan and the chimney.
9. The electric furnace flue gas waste heat utilization system of claim 7, further comprising:
the emergency flue gas quenching tower is connected with the cyclone dust collector, and the emergency flue gas quenching tower is connected with the flue gas treatment device.
10. The electric furnace flue gas waste heat utilization system of claim 9, further comprising:
the second inlet valve is arranged between the cyclone dust collector and the emergency flue gas quenching tower;
and the second outlet valve is arranged between the emergency flue gas quenching tower and the flue gas treatment device.
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