CN106839790B - Electricity converter flue gas waste heat power generation system - Google Patents
Electricity converter flue gas waste heat power generation system Download PDFInfo
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- CN106839790B CN106839790B CN201710069521.6A CN201710069521A CN106839790B CN 106839790 B CN106839790 B CN 106839790B CN 201710069521 A CN201710069521 A CN 201710069521A CN 106839790 B CN106839790 B CN 106839790B
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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
- 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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- 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
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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
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Abstract
The invention discloses an electric converter flue gas waste heat power generation system, which comprises a first gasification cooling flue, a second gasification cooling flue, a combustion settling chamber, a third gasification cooling flue and a waste heat boiler which are sequentially communicated from a flue gas outlet of a water-cooling elbow above an electric converter along the flow direction of flue gas, wherein an evaporator and an economizer in the waste heat boiler are sequentially arranged along the flow direction of the flue gas; the high-pressure steam-water system is used for cooling the second gasification cooling flue, the furnace cover of the combustion settling chamber, the third gasification cooling flue and the waste heat boiler, water is supplied by the high-pressure boiler barrel, so that high-pressure steam is generated, and the steam output by the high-pressure boiler barrel is processed by the heat accumulator to drive the steam turbine to drive the generator to generate electricity.
Description
Technical Field
The invention relates to the technical field of energy conservation in the steel industry, in particular to a power generation system by using flue gas waste heat of an electric converter.
Background
The electric converter is a steelmaking furnace which is gradually developed and gradually popularized in recent years, is different from a top-blown oxygen converter and a direct-current electric arc furnace, and is a technical combination of the top-blown oxygen converter and the direct-current electric arc furnace. During the smelting process of the electric converter, a large amount of high-temperature flue gas (the highest temperature can even reach more than 1600 ℃) can be generated. The high-temperature flue gas not only takes away a large amount of heat energy, but also influences the operation of downstream dust removal equipment, thereby bringing about the problem of environmental pollution.
In recent years, with the increasing importance of steel enterprises on energy conservation and emission reduction, how to fully recover sensible heat in high-temperature flue gas in a steelmaking process and change waste into valuable becomes a problem of increasing concern of the steel enterprises. Because the electric converter is steelmaking equipment which is started in recent years, a set of complete electric converter high-temperature flue gas waste heat utilization scheme is not formed at present, the recovery mode adopted in engineering is generally extensive, a heat exchange system is not designed according to the grade of flue gas, and the flue gas waste heat cannot be fully utilized. Therefore, a scheme capable of fully utilizing the flue gas waste heat resources of the electric converter is constructed, so that the waste heat of the flue gas of the electric converter can be fully recovered and reasonably utilized, considerable economic benefits can be generated inevitably, and the method has important practical significance.
Disclosure of Invention
According to one aspect of the invention, the electric converter flue gas waste heat power generation system comprises a first vaporization cooling flue, a second vaporization cooling flue, a combustion settling chamber, a third vaporization cooling flue and a waste heat boiler which are sequentially communicated from a flue gas outlet of a water-cooling elbow above an electric converter along a flue gas flowing direction, wherein an evaporator and an economizer in the waste heat boiler are sequentially arranged along the flue gas flowing direction; the high-pressure steam-water system is used for cooling the second gasification cooling flue, the furnace cover of the combustion settling chamber, the third gasification cooling flue and the waste heat boiler, water is supplied by the high-pressure boiler barrel, so that high-pressure steam is generated, the high-pressure boiler barrel is sequentially communicated with the heat accumulator and the steam turbine through steam pipelines, and stable steam from the heat accumulator enters the steam turbine, so that the steam turbine is driven to drive the generator to generate electricity.
Preferably, the low-pressure steam-water system comprises a low-pressure drum-deaerator and a low-pressure circulating pump, the low-pressure drum-deaerator is connected with the low-pressure circulating pump through a first descending pipe, a water outlet pipeline of the low-pressure circulating pump is divided into two paths, one path is communicated with a water inlet of a first gasification cooling flue, the other path is communicated with a water inlet of a gasification cooling device of a furnace door of a combustion settling chamber, a steam outlet of the first gasification cooling flue and a steam outlet of the gasification cooling device of the furnace door of the combustion settling chamber are communicated with an ascending pipe orifice of the low-pressure drum-deaerator, the high-pressure steam-water system comprises a water feed pump, a high-pressure drum and a high-pressure circulating pump, the low-pressure drum-deaerator is connected with the water feed pump through a first water outlet pipe, a water outlet pipeline of the water feed pump is communicated with a water inlet of an economizer, the water outlet of the economizer is communicated with the water inlet of the high-pressure boiler barrel, the high-pressure boiler barrel is connected with the high-pressure circulating pump through a second descending pipe, an outlet pipeline of the high-pressure circulating pump is divided into a plurality of branches which are respectively communicated with the water inlet of the second vaporization cooling flue, the water inlet of the third vaporization cooling flue and the water inlet of the vaporization cooling device of the furnace cover of the combustion settling chamber, a steam outlet of the second vaporization cooling flue, a steam outlet of the third vaporization cooling flue and a steam outlet of the vaporization cooling device of the furnace cover of the combustion settling chamber are communicated with an ascending pipe orifice of the high-pressure boiler barrel through pipelines to form a closed forced circulation loop, the high-pressure boiler barrel is connected with the water inlet of an evaporator in the waste heat boiler through the third descending pipe, and the steam outlet of the evaporator is communicated with an ascending pipe orifice of the high-pressure boiler barrel, forming a natural circulation loop.
Preferably, the outlet steam pipeline of the heat accumulator is further divided into a branch which is communicated with an auxiliary heating steam interface of the low-pressure boiler barrel-deaerator.
Preferably, in the exhaust-heat boiler, a condensate preheater arranged in a countercurrent mode is further arranged on the downstream of the flue gas side of the economizer and used for preheating condensate from a steam turbine, and a steam exhaust pipeline of the steam turbine is sequentially connected with a condenser, a condensate pump, the condensate preheater in the exhaust-heat boiler and a water inlet of a low-pressure boiler barrel-deaerator along a condensate flow path.
Preferably, a convection flue is arranged between the third vaporization cooling flue and the waste heat boiler, a convection heat exchanger which is arranged in a countercurrent mode is arranged in the convection flue, a branch is divided from a water outlet pipeline of the high-pressure circulating pump and is connected with a water inlet of the convection heat exchanger in the convection flue, and a steam outlet of the convection heat exchanger is connected with an ascending pipe orifice of the high-pressure boiler barrel through a pipeline.
Preferably, the first vaporization cooling flue adopts a movable flue, the second vaporization cooling flue and the third vaporization cooling flue adopt fixed flues, a flue gas inlet end of the first vaporization cooling flue is communicated with a flue gas outlet end of the water-cooling elbow and is provided with a preset gap, and a flue gas outlet end of the first vaporization cooling flue is communicated with a flue gas inlet end of the second vaporization cooling flue; the first gasification cooling flue is provided with a traction device, the traction device can drive the first gasification cooling flue to horizontally move, and the flue gas outlet end of the first gasification cooling flue is attached to the flue gas inlet end of the second gasification cooling flue to horizontally move, so that the gap between the first gasification cooling flue and the water-cooling elbow is controlled, and the combustion air quantity entering the first gasification cooling flue is further adjusted.
Preferably, the evaporator is arranged in a countercurrent mode, a water inlet of the evaporator is located at a low-temperature flue gas end of the evaporator, and a steam outlet of the evaporator is located at a high-temperature flue gas end of the evaporator.
Drawings
The above features and technical advantages of the present invention will become more apparent and readily appreciated from the following description of the embodiments thereof taken in conjunction with the accompanying drawings.
Fig. 1 is a schematic diagram showing an electric converter flue gas waste heat power generation system according to an embodiment of the present invention.
The system comprises an electric converter 1, a water-cooled elbow 2, a first gasification cooling flue 3, a second gasification cooling flue 4, a combustion settling chamber 5, a third gasification cooling flue 6, a convection flue 7, a waste heat boiler 8 (comprising an evaporator 81, an economizer 82 and a condensed water preheater 83), a low-pressure drum-deaerator 9, a high-pressure drum 10, a low-pressure circulating pump 11, a water feed pump 12, a high-pressure circulating pump 13, a heat accumulator 14, a steam turbine 15, a generator 16, a condenser 17, a condensed water pump 18, a first descending pipe 91, a first water outlet pipe 92, a second descending pipe 101 and a third descending pipe 102.
Detailed Description
An embodiment of the power generation system using the waste heat of flue gas of an electric converter according to the present invention will be described with reference to the accompanying drawings. Those of ordinary skill in the art will recognize that the described embodiments can be modified in various different ways, or combinations thereof, without departing from the spirit and scope of the present invention. Accordingly, the drawings and description are illustrative in nature and not intended to limit the scope of the claims. Furthermore, in the present description, the drawings are not to scale and like reference numerals refer to like parts. It should be noted that the high pressure and the low pressure in the present invention are distinguished names for distinguishing the pressure levels of the steam-water system (for example, the pressures of the high pressure steam and the low pressure steam are respectively designed to be 2.45MPa and 0.5MPa), and are not absolute high pressure (for example, 9.81MPa) and absolute low pressure (for example, 0.8MPa), and the following steam-water flow directions all flow as indicated by arrows in the figure.
The invention discloses an electric converter flue gas waste heat power generation system which comprises a first vaporization cooling flue 3, a second vaporization cooling flue 4, a combustion settling chamber 5, a third vaporization cooling flue 6 and a waste heat boiler 8 which are sequentially communicated from a flue gas outlet of a water-cooling elbow 2 above an electric converter 1 along the flow direction of flue gas, wherein flue gas discharged by the waste heat boiler 8 enters a downstream dust removal facility as shown by an arrow A, and is discharged after further dust removal. The evaporator 81 and the economizer 82 in the exhaust-heat boiler 8 are sequentially arranged along the flow direction of flue gas, and the flue gas waste heat power generation system is divided into a low-pressure steam-water system and a high-pressure steam-water system according to different working pressures, wherein the low-pressure steam-water system is used for cooling the first gasification cooling flue 3 and the furnace door 51 of the combustion settling chamber 5, and water is supplied by a low-pressure boiler drum-deaerator 9, so that low-pressure steam is generated, the low-pressure boiler drum-deaerator is a combination of a low-pressure boiler drum and a deaerator, the deaerator is arranged above the low-pressure boiler drum, and the low-pressure boiler drum can also serve as a deaerat. The high-pressure steam-water system is used for cooling the second evaporation cooling flue 4, the furnace cover 52 of the combustion settling chamber 5, the third evaporation cooling flue 6 and the waste heat boiler 8, water is supplied by a high-pressure boiler barrel 10 (also called a steam pocket, which is the most important compression element in a natural circulation boiler) so as to generate high-pressure steam, and the steam output by the high-pressure boiler barrel 10 is processed by a heat accumulator 14 and then is matched with a steam turbine 15 and a generator 16 to complete waste heat utilization. Specifically, the steam outlet of the high-pressure drum 10 is communicated with the steam inlet of the heat accumulator 14, and the steam outlet of the heat accumulator 14 supplies steam to the steam turbine 15, so that the steam turbine is driven to drive the generator 16 to generate electricity. In particular, the heat accumulator 14 also branches off to a line which is connected to the auxiliary heating steam connection of the low-pressure drum deaerator 9.
The low-pressure steam-water system and the high-pressure steam-water system of the electric converter flue gas waste heat power generation system are explained in detail below. In order to ensure the rapid cooling of the first gasification cooling flue at the high temperature end and consider the mobility of the furnace door of the combustion settling chamber, a low-pressure steam-water system is adopted for cooling the first gasification cooling flue and the furnace door of the combustion settling chamber. As shown in fig. 1, the low-pressure steam-water system includes a low-pressure drum-deaerator 9 and a low-pressure circulating pump 11, the low-pressure drum-deaerator 9 is connected with the low-pressure circulating pump 11 through a first descending pipe 91, a water outlet pipeline of the low-pressure circulating pump 11 is branched into two paths, one path is communicated with a water inlet of the first vaporization cooling flue 3, the other path is communicated with a water inlet of a vaporization cooling device of the furnace door 51 of the combustion settling chamber 5, and a steam outlet of the first vaporization cooling flue 3 and a steam outlet of the vaporization cooling device of the furnace door 51 of the combustion settling chamber 5 are communicated with an ascending pipe orifice of the low-pressure drum-deaerator 9.
For other heat exchange systems, a high-pressure steam-water system is adopted, and the feed water is supplied by the sewage of the high-pressure boiler barrel 10 with relatively high pressure, so that the waste heat of the flue gas is recovered in a more economic mode. The high-pressure steam-water system comprises a water feeding pump 12 and a high-pressure boiler barrel 10, wherein the low-pressure boiler barrel-deaerator 9 is connected with the water feeding pump 12 through a first water outlet pipe 92, a water outlet pipeline of the water feeding pump 12 is communicated with a water inlet of an economizer 82 in the waste heat boiler 8, and a water outlet of the economizer 82 is communicated with a water inlet of the high-pressure boiler barrel 10.
The high-pressure boiler barrel 10 is connected with the high-pressure circulating pump 13 through a second descending pipe 101, an outlet pipeline of the high-pressure circulating pump 13 is divided into a plurality of branch pipelines which are respectively communicated with a water inlet of the second vaporization cooling flue 4, a water inlet of the third vaporization cooling flue 6 and a water inlet of the vaporization cooling device of the furnace cover 52 of the combustion settling chamber 5, and a steam outlet of the second vaporization cooling flue 4, a steam outlet of the third vaporization cooling flue 6 and a steam outlet of the vaporization cooling device of the furnace cover 52 of the combustion settling chamber 5 are communicated with an ascending pipe opening of the high-pressure boiler barrel 10 through pipelines to form a closed forced circulation loop.
The high-pressure boiler barrel 10 is connected with a water inlet of an evaporator 81 in the waste heat boiler 8 through a third downcomer 102, and a steam outlet of the evaporator 81 is communicated with an ascending pipe opening of the high-pressure boiler barrel 10 to form a natural circulation loop.
The electric converter flue gas waste heat power generation system is reasonably provided with the vaporization cooling flue, the waste heat boiler, the high-pressure boiler barrel and the low-pressure boiler barrel-deaerator to form a high-pressure steam system and a low-pressure steam system, and the high-pressure steam system and the low-pressure steam system can fully absorb the flue gas waste heat.
In an alternative embodiment, a condensate preheater 83 in a counter-flow arrangement is further disposed downstream of the flue gas side of the economizer 82, and is used for preheating condensate from a steam turbine, and an exhaust pipeline of the steam turbine 15 is connected with the condenser 17, the condensate pump 18, the condensate preheater 83 in the waste heat boiler, and a water inlet of the low-pressure drum-deaerator 9 in sequence along a condensate flow path. In particular, the condensate preheater 83 is arranged in a counterflow manner, i.e. the water inlet of the condensate preheater is located at the low-temperature flue gas end of the condensate preheater 83 of the waste heat boiler 8 and the steam outlet of the condensate preheater of the waste heat boiler is located at the high-temperature flue gas end of the condensate preheater of the waste heat boiler.
In an optional embodiment, a convection flue 7 is arranged between the third evaporation cooling flue and the waste heat boiler, a convection heat exchanger arranged in a countercurrent manner is arranged in the convection flue 7, a branch is divided from a water outlet pipeline of the high-pressure circulating pump 13 and is connected with a water inlet of the convection heat exchanger in the convection flue, and a steam outlet of the convection heat exchanger in the convection flue is connected with an ascending pipe orifice of the high-pressure boiler barrel 10 through a pipeline. In particular, the convection heat exchanger is arranged in a countercurrent manner, that is, the water inlet of the convection heat exchanger is located at the low-temperature flue gas end of the convection heat exchanger in the convection flue, and the steam outlet of the convection heat exchanger in the convection flue is located at the high-temperature flue gas end of the convection heat exchanger in the convection flue.
In an alternative embodiment, the first evaporation cooling flue 3, the second evaporation cooling flue 4 and the third evaporation cooling flue 6 are arranged in a concurrent flow manner, specifically, the water inlet of the first evaporation cooling flue 3 is located at the high-temperature flue gas end of the first evaporation cooling flue 3, and the steam outlet of the first evaporation cooling flue 3 is located at the low-temperature flue gas end of the first evaporation cooling flue 3. The water inlet of the second gasification cooling flue 4 is positioned at the high-temperature flue gas end of the second gasification cooling flue 4, and the steam outlet of the second gasification cooling flue 4 is positioned at the low-temperature flue gas end of the second gasification cooling flue 4. The water inlet of the third evaporation cooling flue 6 is positioned at the high-temperature flue gas end of the third evaporation cooling flue 6, and the steam outlet of the third evaporation cooling flue 6 is positioned at the low-temperature flue gas end of the third evaporation cooling flue 6.
In an alternative embodiment, the evaporator 81 is arranged in a counter-flow manner, specifically, the water inlet of the evaporator 81 is located at the low-temperature flue gas end of the evaporator, and the steam outlet of the evaporator 81 is located at the high-temperature flue gas end of the evaporator.
In an alternative embodiment, the economizer 82 is also arranged in a counter-flow manner, the water inlet of the economizer 82 is located at the low-temperature flue gas end of the economizer 82, and the steam outlet of the economizer 82 is located at the high-temperature flue gas end of the economizer.
In an optional embodiment, the first evaporation cooling flue 3 is a movable flue, the second evaporation cooling flue 4 and the third evaporation cooling flue 6 are fixed flues, the flue gas inlet end of the first evaporation cooling flue 4 is communicated with the flue gas outlet end of the water-cooling elbow 2 and has a preset gap, and the flue gas outlet end of the first evaporation cooling flue 3 is communicated with the flue gas inlet end of the second evaporation cooling flue 4. The first gasification cooling flue 3 is provided with a traction device which can drive the first gasification cooling flue 3 to move horizontally, and the flue gas outlet end of the first gasification cooling flue 3 is attached to the flue gas inlet end of the second gasification cooling flue 4 to move horizontally, so that the gap between the first gasification cooling flue 3 and the water-cooling elbow 2 is controlled, and the combustion air quantity entering the first gasification cooling flue 3 is further adjusted.
In conclusion, the electric converter flue gas waste heat power generation system has the following beneficial effects:
(1) the method comprises the steps of fully recovering the high-temperature flue gas waste heat of the electric converter to generate steam for power generation, firstly recovering the high-temperature flue gas waste heat of the electric converter in a vaporization cooling mode, then further absorbing the flue gas waste heat through a convection flue and reducing the temperature of the flue gas to improve the operating condition of a waste heat boiler, and finally recovering the flue gas waste heat of the electric converter in a waste heat boiler mode to reduce the temperature of the flue gas to a certain temperature, thereby not only recovering the waste heat, but also providing conditions for the safe operation of downstream dust removal facilities.
(2) The optimized setting of the heating surface is carried out according to the taste of the flue gas, the safety and the heat economy of the system are comprehensively considered on the design of a high-pressure steam system and a low-pressure steam system and the connection setting of a vaporization cooling flue, a waste heat boiler, a low-pressure boiler barrel, a deaerator and a high-pressure boiler barrel, and the waste heat of the flue gas can be recovered more reasonably.
(3) The tail part of the waste heat boiler is additionally provided with a condensate water preheater, and the flue gas waste heat cooled by the economizer is used for preheating the condensate water from a steam turbine, so that the flue gas waste heat is further absorbed, the heat economy of a waste heat power generation system is improved, the water inlet temperature of a low-pressure boiler barrel and a deaerator is increased, the heat exchange temperature difference of the whole condensate water heat exchange system is reduced, the heat exchange fire consumption of the condensate water heat exchange system is reduced, and the effective energy utilization rate is improved. In addition, the arrangement of the condensate water preheater can also reduce the temperature of the flue gas entering the downstream dust removal facility, ensure the safe operation of the dust removal facility, improve the operation environment of the dust removal facility and prolong the service life of the dust removal facility.
(4) The method has the advantages that compared with the method for realizing the adjustment of the combustion air quantity of the furnace gas through the sliding sleeve, the method has better operability and stability, the system can bear severe operation conditions, the shutdown frequency of the electric converter caused by the fault of the sliding sleeve in the conventional method can be reduced, and the service life of the system is longer.
The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention, and various modifications and changes may be made by those skilled in the art. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (6)
1. An electric converter flue gas waste heat power generation system comprises a first vaporization cooling flue (3), a second vaporization cooling flue (4), a combustion settling chamber (5), a third vaporization cooling flue (6) and a waste heat boiler (8) which are sequentially communicated from a flue gas outlet of a water-cooling elbow (2) above an electric converter (1) along the flow direction of flue gas, wherein an evaporator (81) and an economizer (82) in the waste heat boiler (8) are sequentially arranged along the flow direction of the flue gas,
the electric converter flue gas waste heat power generation system is divided into a low-pressure steam-water system and a high-pressure steam-water system according to different working pressures, wherein,
the low-pressure steam-water system is used for cooling a first gasification cooling flue (3) and a furnace door (51) of a combustion settling chamber (5), and is supplied with water by a low-pressure drum-deaerator (9), so that low-pressure steam is generated; while
The high-pressure steam-water system is used for cooling the second evaporation cooling flue (4), the furnace cover (52) of the combustion settling chamber (5), the third evaporation cooling flue (6) and the waste heat boiler (8), and is supplied with water by the high-pressure boiler barrel (10) so as to generate high-pressure steam,
the high-pressure boiler barrel (10) is sequentially communicated with a heat accumulator (14) and a steam turbine (15) through a steam pipeline, stable steam from the heat accumulator enters the steam turbine, so that the steam turbine is driven to drive a generator (16) to generate power,
wherein the first evaporation cooling flue adopts a movable flue, the second evaporation cooling flue and the third evaporation cooling flue adopt fixed flues, the flue gas inlet end of the first evaporation cooling flue is communicated with the flue gas outlet end of the water-cooling elbow and is provided with a preset gap,
the flue gas outlet end of the first gasification cooling flue is communicated with the flue gas inlet end of the second gasification cooling flue;
the first gasification cooling flue is provided with a traction device, the traction device can drive the first gasification cooling flue to horizontally move, and the flue gas outlet end of the first gasification cooling flue is attached to the flue gas inlet end of the second gasification cooling flue to horizontally move, so that the gap between the first gasification cooling flue and the water-cooling elbow is controlled, and the combustion air quantity entering the first gasification cooling flue is further adjusted.
2. The system for generating power by using the waste heat of flue gas of an electric converter according to claim 1,
the low-pressure steam-water system comprises a low-pressure drum-deaerator (9) and a low-pressure circulating pump (11), wherein the low-pressure drum-deaerator (9) is connected with the low-pressure circulating pump (11) through a first descending pipe (91), a water outlet pipeline of the low-pressure circulating pump (11) is branched into two paths, one path of the water outlet pipeline is communicated with a water inlet of a first vaporization cooling flue (3), the other path of the water outlet pipeline is communicated with a water inlet of a vaporization cooling device of a furnace door (51) of a combustion settling chamber (5), a steam outlet of the first vaporization cooling flue (3) and a steam outlet of the vaporization cooling device of the furnace door (51) of the combustion settling chamber (5) are communicated with an ascending pipe orifice of the low-pressure drum-deaerator (9), and the steam outlet of the vaporization
The high-pressure steam-water system comprises a water feeding pump (12), a high-pressure boiler barrel (10) and a high-pressure circulating pump (13), wherein the low-pressure boiler barrel-deaerator (9) is connected with the water feeding pump (12) through a first water outlet pipe (92), a water outlet pipeline of the water feeding pump (12) is communicated with a water inlet of an economizer (82) in the waste heat boiler (8), a water outlet of the economizer (82) is communicated with a water inlet of the high-pressure boiler barrel (10), and the water outlet of the economizer (82) is communicated with a water inlet of the high-pressure boiler barrel (
The high-pressure boiler barrel (10) is connected with the high-pressure circulating pump (13) through a second descending pipe (101), an outlet pipeline of the high-pressure circulating pump (13) is divided into a plurality of branches which are respectively communicated with a water inlet of the second evaporation cooling flue (4), a water inlet of the third evaporation cooling flue (6) and a water inlet of an evaporation cooling device of a furnace cover (52) of the combustion settling chamber (5), a steam outlet of the second evaporation cooling flue (4), a steam outlet of the third evaporation cooling flue (6) and a steam outlet of the evaporation cooling device of the furnace cover (52) of the combustion settling chamber (5) are communicated with an ascending pipe opening of the high-pressure boiler barrel (10) through pipelines to form a closed forced circulation loop,
the high-pressure boiler barrel (10) is connected with a water inlet of an evaporator (81) in the waste heat boiler (8) through a third descending pipe (102), and a steam outlet of the evaporator (81) is communicated with an ascending pipe opening of the high-pressure boiler barrel (10) to form a natural circulation loop.
3. The system for generating power by using the waste heat of flue gas of an electric converter according to claim 1,
and an outlet steam pipeline of the heat accumulator (14) is also divided into a branch which is communicated with an auxiliary heating steam interface of the low-pressure boiler barrel-deaerator (9).
4. The electric converter flue gas waste heat power generation system according to claim 1, wherein a condensate water preheater (83) arranged in a reverse flow manner is further arranged at the downstream of the flue gas side of the economizer (82) in the waste heat boiler to preheat condensate water from a steam turbine, and a steam exhaust pipeline of the steam turbine is sequentially connected with a condenser (17), a condensate water pump (18), the condensate water preheater (83) in the waste heat boiler and a water inlet of the low-pressure boiler barrel-deaerator (9) along a condensate water flow path.
5. The system for generating power by using the waste heat of flue gas of an electric converter according to claim 1,
a convection flue is arranged between the third evaporation cooling flue and the waste heat boiler, a convection heat exchanger which is arranged in a countercurrent mode is arranged in the convection flue, a branch is divided from a water outlet pipeline of the high-pressure circulating pump and is connected with a water inlet of the convection heat exchanger in the convection flue, and a steam outlet of the convection heat exchanger is connected with an ascending pipe orifice of the high-pressure boiler barrel through a pipeline.
6. The system for generating power by using the waste heat of flue gas of an electric converter according to claim 1,
the evaporator is arranged in a countercurrent mode, a water inlet of the evaporator is located at a low-temperature smoke end of the evaporator, and a steam outlet of the evaporator is located at a high-temperature smoke end of the evaporator.
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| CN108253804B (en) * | 2018-01-12 | 2019-09-24 | 西安石大能源股份有限公司 | A kind of boiler circuit using low hood device recycling calcium silicon furnace waste heat |
| CN108645226B (en) * | 2018-05-24 | 2023-12-29 | 北京京诚科林环保科技有限公司 | Electric stove flue gas double working medium heat exchange composite cycle superheated steam system |
| CN109269315A (en) * | 2018-11-12 | 2019-01-25 | 中冶赛迪技术研究中心有限公司 | Make steel waste heat recycling system |
| CN109668133B (en) * | 2019-01-24 | 2024-03-12 | 江苏双良冷却系统有限公司 | Flue gas waste heat recovery system and method for heating hot water boiler |
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