CN108645226B - Electric stove flue gas double working medium heat exchange composite cycle superheated steam system - Google Patents
Electric stove flue gas double working medium heat exchange composite cycle superheated steam system Download PDFInfo
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- CN108645226B CN108645226B CN201810505161.4A CN201810505161A CN108645226B CN 108645226 B CN108645226 B CN 108645226B CN 201810505161 A CN201810505161 A CN 201810505161A CN 108645226 B CN108645226 B CN 108645226B
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- UGFAIRIUMAVXCW-UHFFFAOYSA-N Carbon monoxide Chemical compound [O+]#[C-] UGFAIRIUMAVXCW-UHFFFAOYSA-N 0.000 title claims abstract description 47
- 239000003546 flue gas Substances 0.000 title claims abstract description 47
- 239000002131 composite material Substances 0.000 title claims abstract description 30
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 94
- 239000002918 waste heat Substances 0.000 claims abstract description 37
- 238000002485 combustion reaction Methods 0.000 claims abstract description 20
- 230000001174 ascending effect Effects 0.000 claims abstract description 9
- 238000001816 cooling Methods 0.000 claims description 71
- 238000005338 heat storage Methods 0.000 claims description 30
- 230000002093 peripheral effect Effects 0.000 claims description 9
- 229910000831 Steel Inorganic materials 0.000 claims description 8
- 238000009825 accumulation Methods 0.000 claims description 8
- 239000010959 steel Substances 0.000 claims description 8
- 230000007246 mechanism Effects 0.000 claims description 6
- 239000011449 brick Substances 0.000 claims description 4
- 239000012530 fluid Substances 0.000 claims description 3
- 238000009413 insulation Methods 0.000 claims description 3
- 238000005265 energy consumption Methods 0.000 abstract description 4
- 238000004519 manufacturing process Methods 0.000 abstract description 4
- 238000010248 power generation Methods 0.000 abstract 1
- 238000012546 transfer Methods 0.000 description 12
- 150000003839 salts Chemical class 0.000 description 6
- 229920006395 saturated elastomer Polymers 0.000 description 6
- 230000007423 decrease Effects 0.000 description 5
- 238000011084 recovery Methods 0.000 description 5
- 230000000630 rising effect Effects 0.000 description 5
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 4
- CDBYLPFSWZWCQE-UHFFFAOYSA-L Sodium Carbonate Chemical compound [Na+].[Na+].[O-]C([O-])=O CDBYLPFSWZWCQE-UHFFFAOYSA-L 0.000 description 4
- 239000012528 membrane Substances 0.000 description 4
- 238000003723 Smelting Methods 0.000 description 3
- 230000008901 benefit Effects 0.000 description 3
- 238000013461 design Methods 0.000 description 3
- 229920000742 Cotton Polymers 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 239000007789 gas Substances 0.000 description 2
- 239000008235 industrial water Substances 0.000 description 2
- 229910052742 iron Inorganic materials 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 238000004321 preservation Methods 0.000 description 2
- 238000007789 sealing Methods 0.000 description 2
- 238000004062 sedimentation Methods 0.000 description 2
- 238000009628 steelmaking Methods 0.000 description 2
- 235000017166 Bambusa arundinacea Nutrition 0.000 description 1
- 235000017491 Bambusa tulda Nutrition 0.000 description 1
- 241001330002 Bambuseae Species 0.000 description 1
- 241000196324 Embryophyta Species 0.000 description 1
- 235000015334 Phyllostachys viridis Nutrition 0.000 description 1
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 1
- 239000011425 bamboo Substances 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000005540 biological transmission Effects 0.000 description 1
- 238000007664 blowing Methods 0.000 description 1
- 239000000498 cooling water Substances 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 238000007689 inspection Methods 0.000 description 1
- 238000012423 maintenance Methods 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 238000002156 mixing Methods 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 239000001301 oxygen Substances 0.000 description 1
- 229910052760 oxygen Inorganic materials 0.000 description 1
- 230000008569 process Effects 0.000 description 1
- 230000009467 reduction Effects 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
- 238000009834 vaporization Methods 0.000 description 1
- 230000008016 vaporization Effects 0.000 description 1
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
- F22—STEAM GENERATION
- F22B—METHODS OF STEAM GENERATION; STEAM BOILERS
- F22B1/00—Methods of steam generation characterised by form of heating method
- F22B1/02—Methods of steam generation characterised by form of heating method by exploitation of the heat content of hot heat carriers
- F22B1/18—Methods of steam generation characterised by form of heating method by exploitation of the heat content of hot heat carriers the heat carrier being a hot gas, e.g. waste gas such as exhaust gas of internal-combustion engines
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F22—STEAM GENERATION
- F22B—METHODS OF STEAM GENERATION; STEAM BOILERS
- F22B33/00—Steam-generation plants, e.g. comprising steam boilers of different types in mutual association
- F22B33/18—Combinations of steam boilers with other apparatus
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F22—STEAM GENERATION
- F22G—SUPERHEATING OF STEAM
- F22G1/00—Steam superheating characterised by heating method
-
- 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
- F27D2017/006—Systems for reclaiming waste heat using a boiler
-
- 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)
- Physics & Mathematics (AREA)
- Thermal Sciences (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Life Sciences & Earth Sciences (AREA)
- Sustainable Development (AREA)
- Sustainable Energy (AREA)
- Environmental & Geological Engineering (AREA)
- Waste-Gas Treatment And Other Accessory Devices For Furnaces (AREA)
Abstract
The invention discloses a double-station heat exchange composite circulation superheated steam system of electric furnace flue gas, which comprises a first flue (4), a combustion settling chamber (5), a second flue (6) and a waste heat boiler (8) which are sequentially connected, wherein the double-station heat exchange composite circulation superheated steam system of electric furnace flue gas further comprises a steam drum (10), a storage tank (17) and a heat accumulator (19), a first outlet of the steam drum (10) is connected with an inlet of a steam-water heat exchanger (20) through a first steam-water circulation descending pipeline (14), and a first inlet of the steam drum (10) is connected with an outlet of the steam-water heat exchanger (20) through a first steam-water circulation ascending pipeline (15). The system can fully utilize the waste heat of the flue gas, produce continuous and superheated steam supply power generation and production and use, and reduce the electric energy consumption to the maximum extent by adopting a water circulation mode combining forced circulation and natural circulation under the condition of guaranteeing the service life of the device, thereby being more suitable for practical use.
Description
Technical Field
The invention relates to the technical field of flue gas waste heat recovery, in particular to a double-station heat exchange composite circulation superheated steam system for flue gas of an electric furnace.
Background
In recent years, with the rising price of scrap steel, domestic electric furnaces are beginning to carry out technical innovation, and the molten iron blending rate is generally improved from 10% to 30% -50% or even more than 80%. The molten iron adding rate of the electric furnace is improved, the corresponding oxygen blowing amount is also improved, the furnace gas of the electric furnace is increased, the heat carried in the furnace gas is also greatly increased, and the economic benefit of the waste heat recovery of the flue gas of the electric furnace is more obvious.
The cooling equipment for the traditional electric furnace flue gas treatment is industrial water cooling, the inlet water temperature is 25-30 ℃, and the outlet water temperature is 45-60 ℃. Although most of the circulating cooling water can be recycled after entering the water treatment cooling tower, about 3% of consumption loss exists in each circulation, and a large amount of electric energy is consumed in the industrial water circulation. In addition, the most critical is that the heat in the flue gas of the electric furnace is not recycled at all.
Some electric furnace flue gas waste heat recovery systems have been developed in succession at home and abroad since 2000, but all have some common problems such as: low steam parameters, low quality, high energy consumption, inconvenient maintenance and inspection, low service life of equipment and the like.
Disclosure of Invention
In order to solve the problem of low flue gas waste heat recovery effect of the existing electric furnace. The invention provides a double-station heat exchange composite circulation superheated steam system for electric furnace flue gas, which fully utilizes flue gas waste heat, continuously generates power and is used for production by superheated steam supply, and the electric energy consumption is reduced to the maximum extent under the condition of guaranteeing the service life of a device by adopting a water circulation mode combining forced circulation and natural circulation, so that the double-station heat exchange composite circulation superheated steam system is more practical.
The technical scheme adopted for solving the technical problems is as follows: the utility model provides an electric stove flue gas double working medium heat transfer composite cycle superheated steam system, includes first flue, burning settling chamber, second flue and the exhaust-heat boiler that connects gradually, electric stove flue gas double working medium heat transfer composite cycle superheated steam system still includes steam drum, storage tank, heat exchanger and heat accumulator, be equipped with steam-water heat exchanger and heat accumulation heat exchanger in the exhaust-heat boiler, the first export of steam drum is through the entry linkage of first steam-water circulation decline pipeline with steam-water heat exchanger, the first entry of steam drum is through the exit linkage of first steam-water circulation decline pipeline with steam-water heat exchanger, the exit linkage of storage tank through the entry linkage of first input pipeline with heat accumulation heat exchanger, the entry linkage of heat accumulator through the entry linkage of second input pipeline with heat exchanger, the exit linkage of heat exchanger has the second output pipeline, the fluid of heat accumulator discharge can pass through heat exchanger and the working medium heat transfer in the storage tank.
The first flue contains first water-cooling structure, and the combustion settling chamber contains top cap and side perisporium, and the top cap contains second water-cooling structure, contains the ash removal door in the side perisporium, and the ash removal door contains third water-cooling structure.
The double-station heat exchange composite circulation superheated steam system of the electric furnace flue gas further comprises a deaerator, wherein a water space outlet of the deaerator is respectively connected with an inlet of the first water-cooling structure, an inlet of the second water-cooling structure and an inlet of the third water-cooling structure through a second steam-water circulation descending pipeline, and a steam space inlet of the deaerator is respectively connected with an outlet of the first water-cooling structure, an outlet of the second water-cooling structure and an outlet of the third water-cooling structure through a second steam-water circulation ascending pipeline.
The second outlet of the steam drum is respectively connected with the inlet of the first water cooling structure, the inlet of the second water cooling structure and the inlet of the third water cooling structure through a second steam-water circulation descending pipeline, and the second inlet of the steam drum is respectively connected with the outlet of the first water cooling structure, the outlet of the second water cooling structure and the outlet of the third water cooling structure through a second steam-water circulation ascending pipeline.
The first flue is an elbow flue, the first flue comprises an upper flue and a lower flue which are connected through a flange, the inlet end of the first flue faces towards the horizontal direction, the outlet end of the first flue faces downwards, and the outlet end of the first flue is spliced with the top cover of the combustion settling chamber.
The double-station heat exchange composite circulation superheated steam system of the electric furnace flue gas further comprises a sliding sleeve mechanism, the sliding sleeve mechanism comprises a sliding sleeve, a bracket trolley and a mechanical driving assembly, one end of the sliding sleeve is arranged outside the inlet end of the first flue in a sealing mode, the other end of the sliding sleeve is arranged outside the outlet end of the water-cooling elbow of the electric furnace cover in a sealing mode, the bracket trolley can support the sliding sleeve, and the mechanical driving assembly can drive the sliding sleeve and the bracket trolley to reciprocate along the horizontal direction.
The sliding sleeve is of a cylindrical structure, the cylinder wall of the sliding sleeve is of a dense-exhaust pipe structure, the first water-cooling structure is located at the lower end of the upper section flue and the upper end of the lower section flue of the first flue, the combustion sedimentation chamber is of a cubic structure, a cavity communicated with the first flue and the second flue is formed in the combustion sedimentation chamber, and the side peripheral wall is built by refractory bricks.
The section of the second flue is round or square, the position of the inlet end of the second flue is lower than the position of the outlet end of the second flue, and a first compensator is arranged between the outlet end of the second flue and the inlet of the waste heat boiler.
The second flue is a heat-insulating flue and comprises a heat-insulating layer and a steel pipe which are sequentially arranged from inside to outside; alternatively, the second flue is a evaporative cooling flue.
The heat exchanger is arranged in the storage tank, a plurality of steam-water heat exchangers arranged along the vertical direction are arranged in the waste heat boiler, at least two steam-water heat exchangers are positioned above the heat storage heat exchanger, at least one steam-water heat exchanger is positioned below the heat storage heat exchanger, the working temperature of a heat conducting medium in the heat storage heat exchanger is 300-600 ℃, a second compensator is arranged between two adjacent steam-water heat exchangers, a second compensator is also arranged between the steam-water heat exchanger and the heat storage heat exchanger, and an electric preheating device is also arranged in the storage tank.
The inlet of the waste heat boiler is positioned at the upper part of the waste heat boiler, the outlet of the waste heat boiler is positioned at the lower part of the waste heat boiler, the steam-water heat exchangers arranged along the vertical direction are positioned between the inlet of the waste heat boiler and the outlet of the waste heat boiler.
The beneficial effects of the invention are as follows: the double-station heat exchange composite circulation superheated steam system for the electric furnace flue gas can reduce ton steel energy consumption on the premise of ensuring steelmaking production, recover high-quality steam, improve economic benefit of the whole plant and have various advantages and practical values. And the similar structural design is not disclosed or used in the similar products, so that the novel structural design belongs to innovation. The invention has larger improvement on the product device, structure or function than the prior electric furnace flue gas treatment technology, has larger progress in technology, produces good use and practical effect, has wide industrial utilization value and is a novel, advanced and practical new design.
Drawings
The accompanying drawings, which are included to provide a further understanding of the invention and are incorporated in and constitute a part of this specification, illustrate embodiments of the invention and together with the description serve to explain the invention.
Fig. 1 is a schematic diagram of the overall structure of the double-station heat exchange composite circulation superheated steam system of the flue gas of the electric furnace in embodiment 1 of the present invention.
Fig. 2 is a schematic diagram of the overall structure of the double-station heat exchange composite circulation superheated steam system of the flue gas of the electric furnace in embodiment 2 of the present invention.
1. A sliding sleeve; 2. a bracket trolley; 3. a mechanical drive assembly; 4. a first flue; 5. a combustion settling chamber; 6. a second flue; 7. a first compensator; 8. a waste heat boiler; 9. a deaerator; 10. a steam drum; 11. a forced circulation pump; 12. a second steam-water circulation descending pipeline; 13. a second steam-water circulation rising pipeline; 14. a first vapor-water circulation descent line; 15. a first steam-water circulation rising pipeline; 16. a heat storage heat exchanger; 17. a storage tank; 18. a heat storage pump group; 19. a heat accumulator; 20. a steam-water heat exchanger; 21. an electric furnace;
41. an upper section flue; 42. A lower section flue; 43. A flange;
51. a top cover; 52. a side peripheral wall; 53. an ash removal door;
171. a heat exchanger; 172. a second input line; 173. a second output line.
Detailed Description
It should be noted that, in the case of no conflict, the embodiments and features in the embodiments may be combined with each other. The invention will be described in detail below with reference to the drawings in connection with embodiments.
Example 1
The utility model provides an electric stove flue gas double working medium heat transfer composite cycle superheated steam system, includes first flue 4, burning settling chamber 5, second flue 6 and exhaust-heat boiler 8 that connect gradually, electric stove flue gas double working medium heat transfer composite cycle superheated steam system still includes steam drum 10, storage tank 17, heat exchanger 171 and heat accumulator 19, be equipped with soda heat exchanger 20 and heat accumulation heat exchanger 16 in the exhaust-heat boiler 8, the first export of steam drum 10 is connected with the entry of soda heat exchanger 20 through first steam-water circulation decline pipeline 14, the first entry of steam drum 10 is connected with the export of soda heat exchanger 20 through first steam-water circulation decline pipeline 15, the export of storage tank 17 is connected with the entry of heat accumulation heat exchanger 16 through first input line, the entry of storage tank 17 is connected with the export of heat accumulation heat exchanger 16 through second input line 172, the exit linkage of heat exchanger 171 has second output line 173, the fluid that heat accumulator 19 discharged can pass through heat exchanger 171 and the heat transfer in the storage tank 17, as shown in FIG. 1.
In the invention, the intermittent smelting furnace is characterized in that the production and the operation are intermittent, the temperature of the flue gas generated by the intermittent smelting furnace is high and low (discontinuous and stable), and the intermittent smelting furnace can comprise an electric furnace for steelmaking. Currently, only saturated steam can be produced in the field of electric furnace waste heat recovery, in the present invention, the storage tank 17 is used for storing a heat-conducting medium, and the heat-conducting medium can enter the heat storage heat exchanger 16 to exchange heat with flue gas in the waste heat boiler 8, and the heat-conducting medium (i.e. heat exchange working medium) can be molten salt or heat-conducting oil, which is not limited thereto. The heat of the high-temperature flue gas can be stored by exchanging heat with the heat conducting medium, the heat accumulator 19 contains saturated steam, and the heat conducting medium can heat the saturated steam into superheated steam again in the storage tank 17 through the heat exchanger 171. In addition, the heat transfer medium can also be used for producing continuous hot water, steam and the like after absorbing heat.
In the present embodiment, the first flue 4 has a first water-cooling structure, the combustion settling chamber 5 has a top cover 51 and a side peripheral wall 52, the top cover 51 has a second water-cooling structure, the side peripheral wall 52 has an ash removal door 53, and the ash removal door 53 has a third water-cooling structure. The first water cooling structure, the second water cooling structure and the third water cooling structure can be membrane water walls or water-cooled close-packed pipes.
In this embodiment, the dual-heat exchange composite circulation superheated steam system of electric furnace flue gas further includes a deaerator 9, where the water space outlet of the deaerator 9 is connected to the inlet of the first water-cooling structure, the inlet of the second water-cooling structure and the inlet of the third water-cooling structure through a second steam-water circulation descending pipeline 12, and the steam space inlet of the deaerator 9 is connected to the outlet of the first water-cooling structure, the outlet of the second water-cooling structure and the outlet of the third water-cooling structure through a second steam-water circulation ascending pipeline 13, as shown in fig. 1. The deaerator 9 exchanges heat with the flue gas in the first flue 4 and the combustion settling chamber 5 through the outlet of the first water-cooling structure, the outlet of the second water-cooling structure and the third water-cooling structure.
In this embodiment, the first flue 4 is a bent pipe flue, and the first flue 4 may be a two-section or three-section structure connected in sequence, and each section of flue adopts independent steam-water circulation. If the first flue 4 can be of a two-stage structure, the first flue 4 comprises an upper flue 41 and a lower flue 42 which are connected through a flange 43, the inlet end of the first flue 4 faces to the horizontal direction, the outlet end of the first flue 4 faces downwards, and the outlet end of the first flue 4 is spliced with a top cover 51 of the combustion settling chamber 5.
In this embodiment, the dual-station heat exchange composite circulation superheated steam system of electric furnace flue gas further comprises a sliding sleeve mechanism, the sliding sleeve mechanism comprises a sliding sleeve 1, a bracket trolley 2 and a mechanical driving assembly 3, the sliding sleeve 1 is of a cylindrical structure, one end of the sliding sleeve 1 is sealed and sleeved outside the inlet end of the first flue 4, the other end of the sliding sleeve 1 is sealed and sleeved outside the outlet end of a furnace cover water-cooling elbow of the electric furnace 21, and flue gas exhausted from the electric furnace 21 can sequentially enter the first flue 4 through the furnace cover water-cooling elbow and the sliding sleeve 1. The bracket trolley 2 is used for supporting the sliding sleeve 1, the mechanical driving assembly 3 can drive the sliding sleeve 1 and the bracket trolley 2 to reciprocate along the horizontal direction, for example, the mechanical driving assembly 3 can drive the sliding sleeve 1 and the bracket trolley 2 to reciprocate along the left-right direction in fig. 1.
In this embodiment, the wall of the sliding sleeve 1 is a dense-row pipe structure, the first water-cooling structure is a membrane water-cooling wall, the first water-cooling structure is located at the lower end of the upper section flue 41 and the upper end of the lower section flue 42 of the first flue 4, the combustion settling chamber 5 is of a cube structure, a cavity which is communicated with the first flue 4 and the second flue 6 is arranged in the combustion settling chamber 5, and the side peripheral wall 52 is built by refractory bricks.
In this embodiment, the section of the second flue 6 may be circular or square, the position of the inlet end of the second flue 6 is lower than the position of the outlet end of the second flue 6, and a first compensator 7 is disposed between the outlet end of the second flue 6 and the inlet of the waste heat boiler 8.
In this embodiment, the second flue 6 may be an insulating flue, and the second flue 6 includes an insulation layer and a steel pipe sequentially disposed from inside to outside; namely, the outer wall of the second flue 6 is a steel pipe, and the inner wall of the second flue 6 is heat insulation cotton and refractory castable. Or, the second flue 6 may be a vaporization cooling flue, the second flue 6 adopts a natural or forced circulation system, the water space outlet of the deaerator 9 may be connected to the inlet of the cooling wall of the second flue 6 through a second vapor-water circulation descending pipeline 12, and the vapor space inlet of the deaerator 9 may be connected to the outlet of the cooling wall of the second flue 6 through a second vapor-water circulation ascending pipeline 13.
In this embodiment, molten salt or heat conducting oil is used as a heat exchange working medium, and the working temperature of the molten salt or heat conducting oil is limited to a certain extent, so that the heat storage heat exchanger 16 is arranged in a boiler area after partial steam-water heat exchange and temperature reduction. The heat exchanger 171 is preferably disposed in the storage tank 17, and a plurality of steam-water heat exchangers 20 arranged in the vertical direction are disposed in the waste heat boiler 8, at least two steam-water heat exchangers 20 are disposed above the heat storage heat exchanger 16, and at least one steam-water heat exchanger 20 is disposed below the heat storage heat exchanger 16. As shown in fig. 1, two steam-water heat exchangers 20 are located above the heat storage heat exchanger 16, and one steam-water heat exchanger 20 is located below the heat storage heat exchanger 16. The working temperature of the heat transfer medium in the heat storage heat exchanger 16 is 300-600 ℃, and if heat transfer oil is used as a heat transfer working medium, the working temperature is 300-400 ℃. When the molten salt is used as heat exchange working medium, the working temperature is 500-600 ℃. A second compensator is arranged between two adjacent steam-water heat exchangers 20, a second compensator is also arranged between the steam-water heat exchangers 20 and the heat storage heat exchanger 16, and an electric preheating device is also arranged in the storage tank 17.
Specifically, the section of thick bamboo wall of sliding sleeve 1 is close calandria structure, and the one end of sliding sleeve 1 closely pastes in electric stove bell water-cooling elbow department, and sliding sleeve 1 also can be connected with deaerator 9 through second catch water circulation decline pipeline 12 and second catch water circulation rise pipeline 13 to make between sliding sleeve 1 and the deaerator 9 can heat transfer. The bracket trolley 2 is a steel structure bracket, and the bracket trolley 2 is provided with four rollers. The mechanical driving assembly 3 controls the sliding sleeve to horizontally move back and forth through gear transmission.
The double-station heat exchange composite circulation superheated steam system of the electric furnace flue gas can adopt natural circulation or forced circulation. When forced circulation is adopted, the forced circulation pump 11 is arranged on the second steam-water circulation descending pipeline 12. The first flue 4 is a membrane water-cooled wall flue, and the inlet and the outlet of the first flue 4 are respectively inserted into the sliding sleeve 1 and the combustion settling chamber 5. The combustion settling chamber 5 is a cuboid, the side peripheral wall 52 is a refractory brick masonry, the top cover 51 is a membrane water-cooled wall, and the ash removal door 53 adopts a water-cooled close-packed pipe.
The deaerator 9 can be used as a low-pressure steam drum, and the forced circulation pump 11 enables the water after deaeration treatment in the deaerator 9 to be connected into the heat-receiving pipes of the first flue 4 and the top cover 51 for heat exchange. The upper side of the steam drum 10 is provided with a rising pipe (a first steam-water circulation rising pipe 15) communicated with the waste heat boiler 8, and the lower side of the steam drum 10 is provided with a falling pipe (a first steam-water circulation falling pipe 14), and a steam output interface and the like. The steam-water heat exchanger 20 is arranged in the waste heat boiler, and the inlet and outlet of the steam-water mixture are communicated with the steam drum 10 through a down pipe and an ascending pipe;
the second flue 6 is an inner heat preservation structure, the outer wall is a steel pipe, the inner wall is heat preservation cotton and refractory castable, one end of the second flue 6 is connected with the side wall of the settling chamber, and the other end of the second flue 6 is connected with the waste heat boiler 8 through the compensator 7.
The heat storage heat exchanger 16 is arranged in the waste heat boiler 8, the heat storage heat exchanger 16 is of a tubular heat exchange structure, the inner tube side is a heat storage medium, and the outer tube side is high-temperature flue gas. The working medium inside the heat storage heat exchanger 16 is molten salt or heat transfer oil, but is not limited thereto. The two ends of the heat storage pump group 18 are respectively connected with the storage tank 17 and the heat storage heat exchanger 16 to provide circulating power for the heat storage medium. The accumulator 19 converts the intermittent, unstable steam produced by the drum 10 into stable, continuous steam. The storage tank 17 is arranged at the outlet of the heat storage pump, and a heat exchanger 171 is arranged in the storage tank and is used for storing heat conducting medium to heat saturated steam.
The working process of the double-station heat exchange composite circulation superheated steam system of the electric furnace flue gas is described below.
The flue gas discharged from the electric furnace 21 is discharged after passing through the first flue 4, the combustion settling chamber 5, the second flue 6 and the waste heat boiler 8 in sequence, the deaerator 9 exchanges heat with the flue gas in the first flue 4 and the combustion settling chamber 5 through the inlet of the first water cooling structure, the inlet of the second water cooling structure and the third water cooling structure, the steam drum 10 exchanges heat with the flue gas in the waste heat boiler 8 through the steam-water heat exchanger 20, the heat conducting medium in the storage tank 17 enters the heat storage heat exchanger 16 to exchange heat with the flue gas in the waste heat boiler 8, the heat conducting medium is heated after entering the heat storage heat exchanger 16, part of heat of the flue gas is stored in the storage tank 17, and saturated steam in the heat storage 19 exchanges heat with the heat conducting medium in the storage tank 17 through the heat exchanger 171. In this way, the saturated steam output from the heat accumulator 19 will become stable, continuous superheated steam after heat exchange.
Example 2
This example is a modification of example 1 in which a deaerator 9 is used in example 1 and a low pressure cycle is performed. In this embodiment, the dual-station heat exchange composite circulation superheated steam system of the electric furnace flue gas adopts a high-pressure circulation system, as shown in fig. 2, and the dual-station heat exchange composite circulation superheated steam system of the electric furnace flue gas does not contain a deaerator 9, and the main difference between this embodiment and embodiment 1 is that the deaerator 9 is absent.
In addition, in the present embodiment, the second outlet of the steam drum 10 is connected to the inlet of the first water-cooling structure, the inlet of the second water-cooling structure and the inlet of the third water-cooling structure through the second steam-water circulation down pipe 12, respectively, and the second inlet of the steam drum 10 is connected to the outlet of the first water-cooling structure, the outlet of the second water-cooling structure and the outlet of the third water-cooling structure through the second steam-water circulation up pipe 13, respectively. The second soda water circulation drop pipe 12 may be provided with a forced circulation pump.
The other technical features of this embodiment are the same as those of embodiment 1, and for the sake of economy, this embodiment will not be described in detail.
The meaning of the double working medium in the invention is: the heat exchange medium employed in the steam-water heat exchanger 20 may be referred to as a first medium (e.g., water) and the heat exchange medium employed in the heat storage heat exchanger 16 may be referred to as a second medium (e.g., molten salt or thermally conductive oil).
The foregoing description of the embodiments of the invention is not intended to limit the scope of the invention, so that the substitution of equivalent elements or equivalent variations and modifications within the scope of the invention shall fall within the scope of the patent. In addition, the technical characteristics and technical scheme, technical characteristics and technical scheme can be freely combined for use.
Claims (7)
1. The electric furnace flue gas double-working-medium heat exchange composite cycle superheated steam system is characterized by comprising a first flue (4), a combustion settling chamber (5), a second flue (6) and a waste heat boiler (8) which are sequentially connected, wherein the electric furnace flue gas double-working-medium heat exchange composite cycle superheated steam system further comprises a steam drum (10), a storage tank (17), a heat exchanger (171) and a heat accumulator (19), a steam-water heat exchanger (20) and a heat accumulation heat exchanger (16) are arranged in the waste heat boiler (8), a first outlet of the steam drum (10) is connected with an inlet of the steam-water heat exchanger (20) through a first steam-water circulation descending pipeline (14), a first inlet of the steam drum (10) is connected with an outlet of the steam-water heat exchanger (20) through a first steam-water circulation ascending pipeline (15), an outlet of a storage tank (17) is connected with an inlet of the heat accumulation heat exchanger (16) through a first input pipeline, an inlet of the storage tank (17) is connected with an outlet of the heat exchanger (16) through a first output pipeline, and a first outlet of the heat accumulator (19) is connected with an outlet of the heat exchanger (171) through a second input pipeline, and a heat accumulation fluid can be discharged from the heat exchanger (17) through the second heat exchanger (171);
the heat exchanger (171) is arranged in the storage tank (17), a plurality of steam-water heat exchangers (20) which are arranged along the vertical direction are arranged in the waste heat boiler (8), at least two steam-water heat exchangers (20) are positioned above the heat storage heat exchanger (16), at least one steam-water heat exchanger (20) is positioned below the heat storage heat exchanger (16), the working temperature of a heat conducting medium in the heat storage heat exchanger (16) is 300-600 ℃, a second compensator is arranged between two adjacent steam-water heat exchangers (20), a second compensator is also arranged between the steam-water heat exchangers (20) and the heat storage heat exchanger (16), and an electric preheating device is also arranged in the storage tank (17);
the inlet of the waste heat boiler (8) is positioned at the upper part of the waste heat boiler (8), the outlet of the waste heat boiler (8) is positioned at the lower part of the waste heat boiler (8), and the steam-water heat exchangers (20) arranged along the vertical direction are positioned between the inlet of the waste heat boiler (8) and the outlet of the waste heat boiler (8);
the first flue (4) comprises a first water cooling structure, the combustion settling chamber (5) comprises a top cover (51) and a side peripheral wall (52), the top cover (51) comprises a second water cooling structure, the side peripheral wall (52) comprises an ash removal door (53), and the ash removal door (53) comprises a third water cooling structure;
the section of the second flue (6) is round or square, the position of the inlet end of the second flue (6) is lower than the position of the outlet end of the second flue (6), and a first compensator (7) is arranged between the outlet end of the second flue (6) and the inlet of the waste heat boiler (8).
2. The double-station heat exchange composite circulation superheated steam system of electric furnace flue gas according to claim 1, further comprising a deaerator (9), wherein the water space outlet of the deaerator (9) is connected with the inlet of the first water-cooling structure, the inlet of the second water-cooling structure and the inlet of the third water-cooling structure respectively through a second steam-water circulation descending pipeline (12), and the steam space inlet of the deaerator (9) is connected with the outlet of the first water-cooling structure, the outlet of the second water-cooling structure and the outlet of the third water-cooling structure respectively through a second steam-water circulation ascending pipeline (13).
3. The double-station heat exchange composite circulation superheated steam system as claimed in claim 1, wherein the second outlet of the steam drum (10) is connected to the inlet of the first water-cooling structure, the inlet of the second water-cooling structure and the inlet of the third water-cooling structure respectively through a second steam-water circulation descending pipeline (12), and the second inlet of the steam drum (10) is connected to the outlet of the first water-cooling structure, the outlet of the second water-cooling structure and the outlet of the third water-cooling structure respectively through a second steam-water circulation ascending pipeline (13).
4. The double-station heat exchange composite circulation superheated steam system as claimed in claim 1, wherein the first flue (4) is a bent pipe flue, the first flue (4) comprises an upper flue (41) and a lower flue (42) connected by a flange (43), the inlet end of the first flue (4) faces horizontally, the outlet end of the first flue (4) faces downwards, and the outlet end of the first flue (4) is spliced with a top cover (51) of the combustion settling chamber (5).
5. The electric furnace flue gas duplex heat exchange composite cycle superheated steam system according to claim 4, further comprising a sliding sleeve mechanism, wherein the sliding sleeve mechanism comprises a sliding sleeve (1), a bracket trolley (2) and a mechanical driving assembly (3), one end of the sliding sleeve (1) is sealed and sleeved outside an inlet end of the first flue (4), the other end of the sliding sleeve (1) is sealed and sleeved outside an outlet end of a water-cooled elbow of the electric furnace cover, the bracket trolley (2) can support the sliding sleeve (1), and the mechanical driving assembly (3) can drive the sliding sleeve (1) and the bracket trolley (2) to reciprocate along the horizontal direction.
6. The double-station heat exchange composite circulation superheated steam system of electric furnace flue gas according to claim 5, characterized in that the sliding sleeve (1) is of a cylindrical structure, the cylinder wall of the sliding sleeve (1) is of a dense-exhaust structure, the first water-cooling structure is positioned at the lower end of the upper section flue (41) and the upper end of the lower section flue (42) of the first flue (4), the combustion settling chamber (5) is of a cubic structure, a cavity which is communicated with the first flue (4) and the second flue (6) is arranged in the combustion settling chamber (5), and the side peripheral wall (52) is of a refractory brick masonry.
7. The double-station heat exchange composite circulation superheated steam system of electric furnace flue gas according to claim 1, wherein,
the second flue (6) is an adiabatic flue, and the second flue (6) comprises an insulation layer and a steel pipe which are sequentially arranged from inside to outside;
alternatively, the second flue (6) is a evaporative cooling flue.
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| CN109654895A (en) * | 2018-12-10 | 2019-04-19 | 南京凯盛开能环保能源有限公司 | A kind of device and recovery method of high efficiente callback electric furnace flue gas waste heat |
| US20220275936A1 (en) * | 2021-02-26 | 2022-09-01 | Outokumpu Stainless USA. LLC | Cooling system for steel production system |
Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN201050944Y (en) * | 2007-05-30 | 2008-04-23 | 中冶京诚工程技术有限公司 | Electric furnace flue gas waste heat recovery device |
| CN101893388A (en) * | 2010-08-12 | 2010-11-24 | 宝钢工程技术集团有限公司 | Electric furnace double dust collection and waste heat recovery system and method |
| CN204757712U (en) * | 2015-06-17 | 2015-11-11 | 中冶南方工程技术有限公司 | Electric stove flue gas processing system |
| CN106839790A (en) * | 2017-02-08 | 2017-06-13 | 中冶华天工程技术有限公司 | A kind of electric converter gas afterheat generating system |
| CN106839791A (en) * | 2017-02-08 | 2017-06-13 | 中冶华天工程技术有限公司 | Electric furnace flue gas waste heat Optimum utilization system based on many die pressing types |
| CN207365730U (en) * | 2017-11-02 | 2018-05-15 | 中冶赛迪工程技术股份有限公司 | A kind of electric furnace residual neat recovering system |
| CN208333133U (en) * | 2018-05-24 | 2019-01-04 | 北京京诚科林环保科技有限公司 | Electric furnace flue gas double-working-medium heat exchange composite circulation superheated steam system |
-
2018
- 2018-05-24 CN CN201810505161.4A patent/CN108645226B/en active Active
Patent Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN201050944Y (en) * | 2007-05-30 | 2008-04-23 | 中冶京诚工程技术有限公司 | Electric furnace flue gas waste heat recovery device |
| CN101893388A (en) * | 2010-08-12 | 2010-11-24 | 宝钢工程技术集团有限公司 | Electric furnace double dust collection and waste heat recovery system and method |
| CN204757712U (en) * | 2015-06-17 | 2015-11-11 | 中冶南方工程技术有限公司 | Electric stove flue gas processing system |
| CN106839790A (en) * | 2017-02-08 | 2017-06-13 | 中冶华天工程技术有限公司 | A kind of electric converter gas afterheat generating system |
| CN106839791A (en) * | 2017-02-08 | 2017-06-13 | 中冶华天工程技术有限公司 | Electric furnace flue gas waste heat Optimum utilization system based on many die pressing types |
| CN207365730U (en) * | 2017-11-02 | 2018-05-15 | 中冶赛迪工程技术股份有限公司 | A kind of electric furnace residual neat recovering system |
| CN208333133U (en) * | 2018-05-24 | 2019-01-04 | 北京京诚科林环保科技有限公司 | Electric furnace flue gas double-working-medium heat exchange composite circulation superheated steam system |
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