CN113776345A - Efficient power generation system using flue gas waste heat of electric furnace - Google Patents
Efficient power generation system using flue gas waste heat of electric furnace Download PDFInfo
- Publication number
- CN113776345A CN113776345A CN202111169854.9A CN202111169854A CN113776345A CN 113776345 A CN113776345 A CN 113776345A CN 202111169854 A CN202111169854 A CN 202111169854A CN 113776345 A CN113776345 A CN 113776345A
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- Prior art keywords
- waste heat
- flue gas
- steam
- electric furnace
- power generation
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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
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- 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
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F22—STEAM GENERATION
- F22B—METHODS OF STEAM GENERATION; STEAM BOILERS
- F22B11/00—Steam boilers of combined fire-tube type and water-tube type, i.e. steam boilers of fire-tube type having auxiliary water tubes
- F22B11/02—Steam boilers of combined fire-tube type and water-tube type, i.e. steam boilers of fire-tube type having auxiliary water tubes the fire tubes being in upright arrangement
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F22—STEAM GENERATION
- F22B—METHODS OF STEAM GENERATION; STEAM BOILERS
- F22B37/00—Component parts or details of steam boilers
- F22B37/02—Component parts or details of steam boilers applicable to more than one kind or type of steam boiler
- F22B37/22—Drums; Headers; Accessories therefor
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F22—STEAM GENERATION
- F22D—PREHEATING, OR ACCUMULATING PREHEATED, FEED-WATER FOR STEAM GENERATION; FEED-WATER SUPPLY FOR STEAM GENERATION; CONTROLLING WATER LEVEL FOR STEAM GENERATION; AUXILIARY DEVICES FOR PROMOTING WATER CIRCULATION WITHIN STEAM BOILERS
- F22D1/00—Feed-water heaters, i.e. economisers or like preheaters
- F22D1/50—Feed-water heaters, i.e. economisers or like preheaters incorporating thermal de-aeration of feed-water
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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
- F27D17/008—Arrangements for using waste heat; Arrangements for using, or disposing of, waste gases cleaning gases
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- 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
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E20/00—Combustion technologies with mitigation potential
- Y02E20/14—Combined heat and power generation [CHP]
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- 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
Abstract
The invention provides an electric furnace flue gas waste heat high-efficiency power generation system which comprises a flue gas flow device and a steam-water flow device, wherein the flue gas flow device comprises two waste heat boilers communicated with an electric furnace settling chamber, a quench tower arranged on a waste heat boiler bypass, and dust collectors communicated with the waste heat boilers, the waste heat boilers correspond to the electric furnace settling chamber one by one, a plurality of groups of nozzles for spraying cooling water are arranged in the quench tower, the dust collectors are communicated with a chimney through a draught fan, an activated carbon spraying device is arranged on a flue between each waste heat boiler and the corresponding dust collector, the steam-water flow device comprises two waste heat boilers, and steam drums of the two waste heat boilers are communicated with a steam turbine of a steam turbine generator set.
Description
Technical Field
The invention relates to the technical field of energy conservation and utilization in the steel industry, in particular to an electric furnace flue gas waste heat efficient power generation system.
Background
The electric arc furnace steelmaking is one of the world main steelmaking methods, uses scrap steel as a main raw material, and has the characteristics of short flow, low energy consumption and the like. In recent years, with the gradual release of scrap steel resources and the requirements of energy conservation and environmental protection, the electric arc furnace steelmaking is rapidly developed.
In the electric furnace smelting process, a large amount of high-temperature flue gas is generated. Most of the existing electric furnace flue gas is not recycled, but simply adopts the mode of firstly cooling and then dedusting. The cooling is mainly water cooling to enhance air cooling, which causes waste of heat energy. Waste heat recovery is reluctantly adopted in a small number of electric furnace flue gases, a water tube waste heat boiler and a heat storage type waste heat boiler are usually adopted to recover the waste heat of the high-temperature flue gas, the recovered steam is only used for supplementing a steam pipe network, and the recovery efficiency is not high; even add the superheater to heat steam in the flow of recovering the soda water, the whole system is complicated and the recovery efficiency is not high. Meanwhile, toxic carcinogenic substance dioxin can be generated in the recycling process of the high-temperature flue gas, and the recycling process is also a difficult point for recycling the waste heat of the flue gas of the electric furnace.
Disclosure of Invention
The invention aims to overcome the defects of the prior art and provides a high-efficiency power generation system by using the flue gas waste heat of an electric furnace. The two electric furnaces correspond to the two waste heat boilers, the steam of the boiler drum enters the two heat accumulators for storage through a switching type main pipe system, and the saturated steam led out from the heat accumulators is gathered and then enters the steam turbine for power generation through the steam-water separator. The temperature and the flow of the flue gas generated in the smelting process of the electric furnace are constantly changed, the high-efficiency power generation system can continuously and stably operate, meanwhile, an activated carbon injection device and other measures arranged in the system can effectively control the generation and the removal of dioxin, the high-efficiency utilization of the flue gas waste heat of the electric furnace is ensured, and the environmental protection performance is ensured.
The invention is realized by the following steps:
the invention provides an electric furnace flue gas waste heat high-efficiency power generation system which comprises a flue gas flow device and a steam-water flow device, wherein the flue gas flow device comprises two waste heat boilers communicated with an electric furnace settling chamber, a quench tower arranged on a waste heat boiler bypass, and dust collectors communicated with the waste heat boilers, the waste heat boilers correspond to the electric furnace settling chamber one by one, a plurality of groups of nozzles for spraying cooling water are arranged in the quench tower, the dust collectors are communicated with a chimney through a draught fan, an activated carbon spraying device is arranged on a flue between each waste heat boiler and the corresponding dust collector, the steam-water flow device comprises two waste heat boilers, and steam drums of the two waste heat boilers are communicated with a steam turbine of a steam turbine generator set.
Preferably, the two waste heat boilers are connected to the two heat accumulators through a switching type main pipe, the two heat accumulators are communicated with a steam turbine through a steam-water separator, and the steam turbine drives a generator of a steam turbine generator unit to generate power.
Preferably, a steam balance pipe and a water balance pipe are communicated between the two heat accumulators.
Preferably, the steam-water flow device further comprises a condenser for collecting condensed water of the steam turbine, the condenser is communicated with deaerators corresponding to the two waste heat boilers through a condensed water pump, the deaerators are communicated with the waste heat boilers through a water feeding pump, and water is heated to generate saturated steam to enter a steam drum.
Preferably, the tail part of the waste heat boiler is provided with an economizer.
Preferably, the condenser is provided with a water replenishing port.
Preferably, the dust remover is a bag-type dust remover.
The invention has the following beneficial effects:
the waste heat of the high-temperature flue gas of the electric furnace is efficiently recycled and finally used for power generation, so that the value of waste heat utilization is improved. The setting of high-efficient exhaust-heat boiler and economizer has fully retrieved the heat in the electric stove high temperature flue gas, the security of whole power generation system has been guaranteed in setting up of quench tower, and two electric stove exhaust-heat boilers correspond a turbo generator set, the stable and continuous operation of power generation system has been guaranteed in setting up of switching formula main pipe system steam and heat accumulator, and exhaust-heat boiler suppression dioxin's regeneration and active carbon have guaranteed power generation system's feature of environmental protection to getting rid of the dioxin. The waste heat efficient power generation system has popularization value.
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 diagram of an electric furnace flue gas waste heat efficient power generation system provided by an embodiment of the invention;
FIG. 2 is a first enlarged view of a portion of FIG. 1 according to an embodiment of the present invention;
FIG. 3 is a second enlarged view of a portion of FIG. 1 in accordance with an embodiment of the present invention;
fig. 4 is a third enlarged view of the portion of fig. 1 according to the embodiment of the present invention.
Shown in the figure: 1. an electric furnace settling chamber; 2. a waste heat boiler; 3. a quench tower; 4. a bag-type dust collector; 5. an induced draft fan; 6. a chimney; 7. a heat accumulator; 8. a steam turbine; 9. a generator; 10. a condenser; 11. a condensate pump; 12. a deaerator; 13. a feed pump; 14. a steam drum; 15. an activated carbon injection device; 16. a steam-water separator.
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. 1-4, an embodiment of the present invention provides a high efficiency power generation system using flue gas waste heat of a steelmaking electric furnace, including a flue gas flow device and a steam-water flow device, where the flue gas flow device includes two waste heat boilers 2 communicated with an electric furnace settling chamber 1, a quench tower 3 disposed by-pass of the waste heat boilers 2, and a bag-type dust remover 4 communicated with the waste heat boilers 2, the waste heat boilers 2 are in one-to-one correspondence with the electric furnace settling chamber 1, multiple sets of nozzles for spraying cooling water are disposed in the quench tower 3, the bag-type dust remover 4 is communicated with a chimney 6 through a draught fan 5, a quench tower by-pass is disposed in the electric furnace high temperature flue gas entering the waste heat boilers, so that when the boiler overhauls or the temperature of the flue gas discharged from the boiler is too high and threatens a downstream dust removal bag, part or all of the high temperature flue gas can be cut into the quench tower, the water is rapidly sprayed for cooling, the safety of the system is ensured, and an activated carbon injection device 15 is disposed in a flue between the waste heat boilers 2 and the bag-type dust remover 4, and intermittently or continuously spraying activated carbon to remove the regenerated dioxin in the flue. When the high-temperature flue gas enters the waste heat boiler 2, the flow rate of the flue gas is controlled to reduce the temperature of the high-temperature flue gas to 200 ℃ within 2 seconds, so that the generation of dioxin in the temperature reduction process is restrained.
The steam-water flow device comprises two waste heat boilers 2, steam drums 14 of the two waste heat boilers 2 are communicated with a steam turbine 8 of a steam turbine generator unit, the invention provides an electric furnace flue gas waste heat efficient power generation system, the electric furnace flue gas waste heat efficient power generation system comprises two electric furnaces corresponding to the two waste heat boilers 2, the electric furnace flue gas waste heat efficient power generation system corresponds to one steam turbine generator unit to continuously and stably operate, and fluctuation conditions of flue gas of the two electric furnaces can be effectively buffered.
The two waste heat boilers 2 are connected to the two heat accumulators 7 through a switching type main pipe, the two heat accumulators 7 are communicated with a steam turbine 8 through a steam-water separator 16, and the steam turbine 8 drives a generator 9 of a steam turbine generator unit to generate electricity. A steam balance pipe and a water balance pipe are communicated between the two heat accumulators 7. Main steam from the two waste heat boilers 2 is connected to the two heat accumulators 7 through a switching type main pipe, the heat accumulators 7 stabilize and buffer the periodic fluctuation conditions of the flue gas flow and the temperature of the electric furnace, and meanwhile a steam balance pipe and a water balance pipe are communicated between the two heat accumulators 7, so that the steam fluctuation conditions are stabilized better. A steam-water separator 16 is arranged before the steam enters the steam turbine, so that the water content in the steam is reduced, and the steam turbine operates more efficiently.
The steam-water flow device further comprises a condenser 10 collecting condensed water of the steam turbine 8, the condenser 10 is communicated with deaerators 12 corresponding to the two waste heat boilers 2 through a condensed water pump 11, the deaerators 12 are communicated with the waste heat boilers 2 through a water feeding pump 13, and water is heated to generate saturated steam to enter a steam drum 14. The tail part of the waste heat boiler 2 is provided with an economizer, condensed water can enter the economizer of the waste heat boiler for preheating before entering the deaerator 12, and the condensed water is heated to unsaturated water and then enters the deaerator 12. The condenser 10 is provided with a water replenishing port for replenishing steam water lost by the waste heat power generation system.
With the gradual release of scrap steel resources and the requirements of energy conservation and environmental protection, the short-process electric furnace steel making using the scrap steel as a raw material is developed rapidly. However, the utilization rate of the waste heat of the high-temperature flue gas generated by electric furnace smelting is low, and the utilization rate is also low. The invention provides a novel electric furnace flue gas waste heat efficient power generation system, which is characterized in that a waste heat boiler, a quench tower, a dust remover, a heat accumulator and a turbo generator set are reasonably and optimally configured, a flue gas flow and a steam-water flow are optimized, the aim of efficiently recycling high-temperature flue gas of an electric furnace is fulfilled, safety, stability and environmental friendliness are simultaneously considered, and the electric furnace flue gas waste heat efficient power generation system has popularization value.
As shown in figure 1, high-temperature flue gas in the electric furnace smelting process is discharged from an electric furnace settling chamber 1. The temperature of the flue gas of the high-temperature electric furnace can reach 800-1000 ℃, and the amount of the flue gas fluctuates periodically. And (3) allowing the high-temperature flue gas to enter the waste heat boiler 2, and controlling the flow rate of the flue gas to reduce the temperature of the high-temperature flue gas to 200 ℃ within 2 seconds so as to inhibit the generation of dioxin in the cooling process. Waste heat boiler 2 sets up bypass quench tower 3 simultaneously, sets up multiunit nozzle injection cooling water in the quench tower 3, advances waste heat boiler at electric stove high temperature flue gas and sets up the quench tower bypass to when the too high threat low reaches dust removal sack of boiler maintenance or boiler exhaust gas temperature, can cut high temperature flue gas part or whole to the quench tower, quick water spray cooling guarantees the security of system. The flue gas cooled to 200 ℃ is introduced to a bag-type dust collector 4 for dust removal, an induced draft fan 5 is arranged behind the bag-type dust collector 4 to adjust the pressure of the flue gas in the whole flue, and finally the flue gas after dust removal is discharged through a chimney 6. The flue gas flow of a single electric furnace is the same as that of two electric furnaces in the system.
The invention relates to an electric furnace flue gas waste heat efficient power generation system, wherein two electric furnaces correspond to two waste heat boilers 2 and finally correspond to a steam turbine 8 to perform efficient power generation, and the fluctuation conditions of the flue gas of the two electric furnaces can be effectively buffered. Main steam from the steam drums 14 of the two waste heat boilers 2 is connected to the two heat accumulators 7 through a switching type main pipe, and the heat accumulators 7 stabilize and buffer the periodic fluctuation conditions of the flue gas flow and the temperature of the electric furnace. Meanwhile, a steam balance pipe and a water balance pipe are communicated between the two heat accumulators 7, so that the steam fluctuation condition is better stabilized. The unit heat storage capacity of the heat accumulator 7 is the amount of steam generated when unit water is reduced from the charging pressure to the discharging pressure, and the water capacity of the heat accumulator 7 is determined according to the pressure of the waste heat boiler drum 14, the maximum steam production, the average steam production, the heat storage capacity of the heat accumulator and the like. Saturated steam with large water content passes through the steam-water separator 16 and then enters the steam turbine 8 to drive the generator 9 to generate power after passing through the heat accumulator 7. A steam-water separator 16 is arranged before the steam enters the steam turbine, so that the water content in the steam is reduced, and the steam turbine operates more efficiently. The condensed water of the steam turbine 8 is collected to the condenser 10, and is respectively pumped to deaerators 12 corresponding to the two waste heat boilers 2 through the condensed water pump 11, and then enters the waste heat boilers 2 through the water feed pump 13 to be heated, so that the generated saturated steam enters the steam pocket 14, and the steam-water circulation is completed. The method is a steam-water flow of the waste heat power generation system.
In addition, the condenser 10 is provided with a water replenishing port to replenish the steam water lost by the waste heat power generation system.
In addition, an activated carbon injection device 15 is arranged on a flue between the waste heat boiler 2 and the bag-type dust collector 4, and activated carbon is injected discontinuously or continuously to remove the regenerated dioxin in the flue. The specific control can be controlled by a dioxin substance monitoring device additionally arranged at the outlet of the waste heat boiler in a linkage mode or in a manual mode.
The method is further optimized, the coal economizer is arranged at the tail of the waste heat boiler 2, the condensed water can enter the waste heat boiler coal economizer for preheating before entering the deaerator 12, and the condensed water is heated to be unsaturated and then enters the deaerator 12.
Further optimizing the above process, the bag-type dust collector 4 can be replaced by a combination dust collector or other types of dust-removing purification measures.
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 (7)
1. The utility model provides an electric stove flue gas waste heat high efficiency power generation system which characterized in that: including flue gas flow device and soda flow device, flue gas flow device include with two exhaust-heat boiler of electric stove deposit room intercommunication, locate the quench tower of exhaust-heat boiler bypass, with the dust remover of exhaust-heat boiler intercommunication, exhaust-heat boiler with electric stove deposit room one-to-one, be equipped with the nozzle of multiunit injection cooling water in the quench tower, the dust remover passes through draught fan and chimney intercommunication, sets up active carbon injection apparatus on the flue between exhaust-heat boiler to the dust remover, soda flow device includes two exhaust-heat boiler, two exhaust-heat boiler's steam pocket all communicates with turbo generator set's steam turbine.
2. The electric furnace flue gas waste heat high-efficiency power generation system of claim 1, characterized in that: the two waste heat boilers are connected to the two heat accumulators through a switching type main pipe, the two heat accumulators are communicated with a steam turbine through a steam-water separator, and the steam turbine drives a generator of a steam turbine generator unit to generate power.
3. The electric furnace flue gas waste heat high-efficiency power generation system of claim 2, characterized in that: and a steam balance pipe and a water balance pipe are communicated between the two heat accumulators.
4. The electric furnace flue gas waste heat high-efficiency power generation system of claim 1, characterized in that: the steam-water flow device further comprises a condenser collecting the condensed water of the steam turbine, the condenser is communicated with deaerators corresponding to the two waste heat boilers through a condensed water pump, the deaerators are communicated with the waste heat boilers through a water feeding pump, and the water is heated to generate saturated steam to enter the steam drum.
5. The electric furnace flue gas waste heat high-efficiency power generation system of claim 4, characterized in that: and the tail part of the waste heat boiler is provided with a coal economizer.
6. The electric furnace flue gas waste heat high-efficiency power generation system of claim 4, characterized in that: the condenser is provided with a water replenishing port.
7. The electric furnace flue gas waste heat high-efficiency power generation system of claim 1, characterized in that: the dust remover is a bag-type dust remover.
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| CN202111169854.9A CN113776345A (en) | 2021-10-08 | 2021-10-08 | Efficient power generation system using flue gas waste heat of electric furnace |
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| CN202111169854.9A CN113776345A (en) | 2021-10-08 | 2021-10-08 | Efficient power generation system using flue gas waste heat of electric furnace |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115654950A (en) * | 2022-12-27 | 2023-01-31 | 思源交大河北科技有限公司 | Biomass afterburning type electric furnace flue gas waste heat recycling system |
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| CN110686521A (en) * | 2019-11-20 | 2020-01-14 | 中冶南方工程技术有限公司 | Electric furnace flue gas waste heat utilization method and system |
| CN111957197A (en) * | 2020-08-28 | 2020-11-20 | 浙江物华天宝能源环保有限公司 | Efficient flue gas deacidification, dioxin removal and waste heat utilization cooperative system and process |
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2021
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN201071741Y (en) * | 2007-09-07 | 2008-06-11 | 北京佰能电气技术有限公司 | Electric furnace flue gas waste heat power generation system |
| CN201740408U (en) * | 2009-12-18 | 2011-02-09 | 南京凯盛开能环保能源有限公司 | Electric boiler flue gas waste heat recovery system with settlement heat storage chamber |
| CN110327762A (en) * | 2019-07-12 | 2019-10-15 | 大航控股集团节能环保科技股份有限公司 | A kind of flue gas minimum discharge integrated processing system |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115654950A (en) * | 2022-12-27 | 2023-01-31 | 思源交大河北科技有限公司 | Biomass afterburning type electric furnace flue gas waste heat recycling system |
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