CN111288810A - Device and method for efficiently generating power by using waste heat steam of converter - Google Patents
Device and method for efficiently generating power by using waste heat steam of converter Download PDFInfo
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- CN111288810A CN111288810A CN202010181950.4A CN202010181950A CN111288810A CN 111288810 A CN111288810 A CN 111288810A CN 202010181950 A CN202010181950 A CN 202010181950A CN 111288810 A CN111288810 A CN 111288810A
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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
- F01K—STEAM ENGINE PLANTS; STEAM ACCUMULATORS; ENGINE PLANTS NOT OTHERWISE PROVIDED FOR; ENGINES USING SPECIAL WORKING FLUIDS OR CYCLES
- F01K11/00—Plants characterised by the engines being structurally combined with boilers or condensers
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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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- 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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- General Engineering & Computer Science (AREA)
- Environmental & Geological Engineering (AREA)
- Physics & Mathematics (AREA)
- Thermal Sciences (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Waste-Gas Treatment And Other Accessory Devices For Furnaces (AREA)
Abstract
The invention relates to a method for efficiently generating power by using converter waste heat steam, which comprises the steps of firstly converting the converter waste heat steam into saturated steam at 170-190 ℃ through a heat accumulator (4); filtering the flue gas by a filter (5), and then sending the flue gas into a superheater (7) to exchange heat with the high-temperature flue gas at the temperature of 600-650 ℃; after heat exchange, the superheated steam at 370-390 ℃ is sent to a turbonator (10) for power generation, and the steam after power generation is cooled by a condenser (11) and then sent to an economizer (8) by a condensate pump (12) for secondary heat exchange with the flue gas at 300-350 ℃; the steam after the secondary heat exchange is sent to a deaerator (13) and then sent to a converter vaporization system for recycling through a return pipe (14) by a booster pump (15); the flue gas after the secondary heat exchange returns to the high-temperature bin (6 a) to be mixed with the high-temperature flue gas for use. The invention has the advantages that the intermittent and saturated steam generated by the converter is converted into stable superheated steam, the safe operation of the steam turbine is ensured, and the power generation efficiency is greatly improved.
Description
Technical Field
The invention relates to the technical field of recycling of waste heat steam of a converter, in particular to a device and a method for efficiently generating power by using the waste heat steam of the converter.
Background
During the production process of steelmaking in a converter, a large amount of saturated steam is generated in a vaporization flue of the converter. Because the converter steelmaking process is intermittent production operation and steam is generated only in the converter blowing process, the steam parameters generated by the converter are periodically changed, and the change amplitude is very large. When not converting, the steam yield is zero; when blowing, the instantaneous steam production per ton of steel is about 365 kg. The peak value of the steam yield of a 120t converter is above 44 t/h. At present, the way of generating electricity by using the part of steam is to incorporate the steam into a heat accumulator to reduce the fluctuation of steam pressure, and then to generate electricity by using a saturated steam generator set. However, such power generation has the following disadvantages:
(1) steam fluctuations are still large, especially when the number of converters is less than 3. Typically, the amplitude is 0.5 Mpa-1.8 Mpa; (2) the steam is saturated steam, and has high water content when greatly fluctuating, thereby bringing great hidden danger to the safe production of the steam turbine; (3) the steam temperature is low, the enthalpy value is low, and the steam consumption is large during power generation. Under normal conditions, the steam consumption is about 8 kWh/kg; (4) when the number of the converters is less than 3, the steam turbine unit is frequently stopped due to factors such as converter troubleshooting and the like, and great adverse effects are generated on the safety production and the power generation benefits of the steam turbine unit.
The Chinese patent 'converter waste heat steam after-combustion power generation system' with application number 201120309990.9 adopts the mode that waste heat boiler improves steam temperature, but this kind of concurrent heating mode will produce a large amount of low pressure steam when improving saturated steam temperature, that is to say, will consume a large amount of coal gas like this and be used for producing low pressure steam, and the coal gas energy of high quality goes to producing low pressure steam of low quality promptly, has caused the energy waste.
Disclosure of Invention
The invention aims to solve the problems of unreasonable converter waste heat steam afterburning power generation mode, low power generation efficiency and energy waste in the prior art, and provides a device for converter waste heat steam high-efficiency power generation, which reduces steam fluctuation, avoids frequent shutdown, eliminates the phenomenon of water carrying of steam, improves power generation efficiency, reduces power generation steam consumption and ensures the safety of the operation of a steam turbine.
In order to achieve the purpose, the invention adopts the following technical scheme:
a device for efficiently generating power by using waste heat steam of a converter comprises the converter, wherein the converter is connected with a converter vaporization flue, a converter steam pocket is arranged on the converter vaporization flue, the converter steam pocket is connected with a steam inlet of a heat accumulator through a pipeline, a steam outlet of the heat accumulator is connected with an inlet of a filter through a pipeline, and an outlet of the filter is connected with a heat energy circulating device;
the heat energy circulating device comprises a superheater, an economizer and a flue gas system, a cavity of the heat energy circulating device is divided into a high-temperature bin and a heat exchange bin which are connected, the superheater is arranged in the high-temperature bin, the economizer is arranged in the heat exchange bin, an air inlet of the superheater is connected with an outlet of a filter, an air outlet of the superheater is connected with a steam inlet of a turbonator through a pipeline, a steam outlet of the turbonator is connected with a condenser, the condenser is connected with a water inlet of a condensate pump through a pipeline, a water outlet of the condensate pump is connected with an inlet of the economizer through a pipeline, an outlet of the economizer is connected with a water inlet of a deaerator through a pipeline, a water outlet of the deaerator is connected with a converter steam drum through a return;
the flue gas air system includes circulating fan, the circulating air valve, smoke damper and combustor, circulating fan's air intake links to each other with heat energy circulating device's heat transfer storehouse, the air outlet is connected the recovery tube respectively and is discharged the pipe, the recovery tube links to each other with heat energy circulating device's high temperature storehouse, and be equipped with the circulating air valve on the recovery tube, it links to each other with outside exhaust chimney to discharge fume the pipe, and be equipped with the smoke damper on discharging fume the pipe, the combustor links to each other with heat energy circulating device's high temperature storehouse, and be equipped with a set of coal gas pipeline and the air conduit who links to each other with outside air supply system on it, in order to be used for carrying the high temperature flue gas to.
Furthermore, a drain valve is arranged at the lower part of the filter and is connected with the deaerator through a water filter pipe so as to be used for recycling filtered water in the filter.
Further, the burner is a semi-flameless burner.
Furthermore, the filter element of the filter is made of stainless steel.
Further, the fuel of the burner can be blast furnace gas, converter gas, coke oven gas or a combination of the three.
In order to achieve the purpose of the invention, the invention also provides a method for efficiently generating power by using the steam generated by the waste heat of the converter, the used device comprises a heat accumulator, a filter, a heat energy circulating device and a deaerator, and the specific process comprises the following steps:
(1) converter waste heat steam is changed into saturated steam with small continuous pressure fluctuation through a heat accumulator, and the temperature is 170-190 ℃;
(2) then, filtering water by a filter, sending the water into a superheater of a heat energy circulating device, and simultaneously exchanging heat between high-temperature flue gas with the temperature of 600-650 ℃ in a high-temperature bin and steam in the superheater;
(3) sending the superheated steam with the temperature of 370-390 ℃ after heat exchange to a turbonator for power generation, and sending the flue gas with the temperature of 300-350 ℃ after heat exchange to a heat exchange bin;
(4) cooling the low-temperature and low-pressure steam after power generation into condensed water through a condenser, conveying the condensed water into an economizer of a heat energy circulating device through a condensed water pump, and performing secondary heat exchange with the flue gas at the temperature of 300-350 ℃;
(5) and (3) delivering the steam subjected to secondary heat exchange into a deaerator, delivering the steam to a converter steam drum through a return pipe by a pressure pump for recycling, wherein the temperature of the flue gas subjected to secondary heat exchange reaches 200-250 ℃, one part of the flue gas is pressurized by a circulating fan and then is delivered back to a high-temperature bin to be mixed with high-temperature flue gas generated by a combustor for recycling, and the other part of the flue gas is discharged outwards by a smoke discharge pipe.
Further, the temperature of the superheated steam is preferably 370-380 ℃.
In the technical scheme of the invention, the pressure of the heat accumulator is stabilized, the moisture in the steam is removed by the filter, and the steam is heated by the heating furnace, so that the saturated steam is changed into superheated steam, and the steam power generation capacity is greatly improved; in addition, the heat energy circulating device adopted by the invention is a circulating flue gas heating furnace, the temperature of flue gas contacting with the superheater is controlled, the safety of the superheater is ensured, meanwhile, the temperature of the flue gas and the heat loss can be reduced, and the heat efficiency of the heating furnace is improved. The invention not only ensures the safety of the turbonator, but also greatly improves the power generation efficiency of the converter waste heat steam and reduces the power generation steam consumption.
Drawings
FIG. 1 is a schematic structural diagram of an apparatus for efficiently generating power by using waste heat steam of a converter according to the present invention;
fig. 2 is a schematic structural diagram of the thermal energy recycling device of the present invention.
Detailed Description
Example 1
In order to make the present invention more clear, the following describes a device and a method for high efficiency power generation by using waste heat steam of a converter with reference to the attached drawings, and the embodiments described herein are only used for explaining the present invention and are not used for limiting the present invention.
Referring to fig. 1, a device for high-efficient power generation of converter waste heat steam, includes converter 1, even has converter vaporization flue 2 on converter 1, is equipped with converter steam pocket 3 on converter vaporization flue 2, and converter steam pocket 3 links to each other its characterized in that through the steam inlet of pipeline with a heat accumulator 4:
the steam outlet of the heat accumulator 4 is connected with the inlet of a filter 5 through a pipeline, and the outlet of the filter 5 is connected with a heat energy circulating device 6;
referring to fig. 1 and 2, the heat energy circulating device 6 comprises a superheater 7, an economizer 8 and a flue gas system 9, the cavity of the heat energy circulating device 6 is divided into a high temperature bin 6a and a heat exchange bin 6b which are connected, the superheater 7 is arranged in the high-temperature bin 6a, the economizer 8 is arranged in the heat exchange bin 6b, an air inlet of the superheater 7 is connected with an outlet of the filter 5, an air outlet of the superheater 7 is connected with a steam inlet of the turbonator 10 through a pipeline, a steam outlet of the turbonator 10 is connected with a condenser 11, the condenser 11 is connected with a water inlet of a condensate pump 12 through a pipeline, a water outlet of the condensate pump 12 is connected with an inlet of the economizer 8 through a pipeline, an outlet of the economizer 8 is connected with a water inlet of a deaerator 13 through a pipeline, a water outlet of the deaerator 13 is connected with the converter steam drum 3 through a return pipe 14, and a pressure pump 15 is arranged on the return pipe 14;
referring to fig. 1 and 2, the smoke and air system 9 includes a circulating fan 91, a circulating air valve 92, a smoke exhaust valve 93 and a burner 94, an air inlet of the circulating fan 91 is connected with a heat exchange bin 6b of the heat energy circulating device 6, an air outlet of the circulating fan 91 is respectively connected with a recovery pipe 16 and a smoke exhaust pipe 17, the recovery pipe 16 is connected with a high temperature bin 6a of the heat energy circulating device 6, the recovery pipe 16 is provided with the circulating air valve 92, the smoke exhaust pipe 17 is connected with an external exhaust chimney 18, and the smoke exhaust pipe 17 is provided with the smoke exhaust valve 93 for recycling smoke;
the burner 94 is a semi-flameless burner, the air outlet of which is connected with the high-temperature chamber 6a of the heat energy circulating device 6, and the burner 94 is provided with a group of gas pipelines 19 and air pipelines 20 which are connected with an external air supply system and used for conveying high-temperature flue gas to the high-temperature chamber to heat the steam in the superheater;
the filter element of the filter 5 is made of stainless steel, the lower part of the filter is provided with a drain valve 21, and the drain valve 21 is connected with the deaerator 13 through a water filter pipe 22 so as to be used for recycling filtered water in the filter;
the fuel for the burner 94 may be blast furnace gas, converter gas, coke oven gas, or a combination of the three.
The burner 94 of the invention adopts a semi-flameless burner, the semi-flameless burner has low burning temperature and is suitable for low heat value fuel such as blast furnace gas, and the like, and the burner belongs to a low-nitrogen burner.
In addition, the smoke and air system 9 of the heat energy circulating device 6 adopts a circulating smoke system, and only part of smoke is discharged outside. The purpose of adopting the circulating flue gas is to mix the flue gas after heat exchange into the original combustion system through the circulating fan, so that the temperature of the flue gas in the hearth can be greatly reduced, the safety of the superheater is ensured, and the generation of nitrogen oxides can be further reduced.
Referring to fig. 1 and fig. 2, the invention further provides a method for high-efficiency power generation by using converter waste heat steam, the used device comprises a heat accumulator 4, a filter 5, a heat energy circulating device 6 and a deaerator 13, and the specific process is as follows, and the method is characterized in that:
(1) converter waste heat steam is changed into saturated steam with small continuous pressure fluctuation through a heat accumulator 4, and the temperature is 170-190 ℃;
(2) then, water is filtered by a filter 5 and then is sent into a superheater 7 of a heat energy circulating device 6, and meanwhile, high-temperature flue gas with the temperature of 600-650 ℃ in a high-temperature bin 6a exchanges heat with steam in the superheater 7;
(3) sending the superheated steam with the temperature of 370-380 ℃ after heat exchange to a turbonator 10 for power generation, and sending the flue gas with the temperature of 300-350 ℃ after heat exchange to a heat exchange bin 6 b;
(4) the low-temperature and low-pressure steam after power generation is cooled into condensed water through a condenser 11, and the condensed water is sent to an economizer 8 of a heat energy circulating device 6 through a condensed water pump 12 to perform secondary heat exchange with the flue gas with the temperature of 300-350 ℃;
(5) and (3) delivering the steam subjected to secondary heat exchange into a deaerator 13, delivering the steam to a converter steam drum 3 through a return pipe 14 by using a pressure pump 15 for recycling, wherein the temperature of the flue gas subjected to secondary heat exchange reaches 200-250 ℃, delivering one part of the flue gas into a high-temperature bin 6a through a circulating fan 91 after being pressurized by using a circulating air valve 92 for mixing and recycling with the high-temperature flue gas generated by a combustor 94, and discharging the other part of the flue gas to an exhaust chimney 18 through an exhaust pipe 17 through an exhaust valve 93.
The core of the invention is a heat energy circulating device 6, the fuel of the heat energy circulating device 6 is blast furnace gas, the operation process is that the blast furnace gas and air enter a combustor 94 through a gas pipeline 19 and an air pipeline 20 and are combusted in the combustor 94, the generated high-temperature flue gas is mixed with the flue gas pressurized by a circulating fan 91, the temperature of a hearth is controlled, the mixed flue gas temperature is 600-650 ℃, the mixed flue gas is firstly subjected to heat exchange with steam in a superheater 7 to reach 370-390 ℃, the flue gas subjected to heat exchange is 300-350 ℃, the mixed flue gas is subjected to secondary heat exchange with an economizer 8 and is further reduced to 200-250 ℃, then a part of the mixed flue gas is pressurized by the circulating fan 91 and discharged outside, and the other part of the mixed flue gas is sent to the hearth for continuous circulating use.
The device can control the temperature of the heated steam by adjusting the gas amount; the pipe wall temperature of the superheater can be controlled by controlling the air quantity of the circulating fan, so that the operation safety of the superheater is ensured. In addition, by adopting a mode of combining the heat accumulator, the filter and the heat energy circulating device, unstable saturated steam generated on a converter vaporization flue can be converted into stable and continuous high-quality superheated steam, the power generation efficiency of the converter waste heat steam is greatly improved, compared with the power generation of the saturated steam, the power generation steam consumption can be improved by more than 60 percent, the power generation steam consumption is usually less than 5 kWh/kg, the moisture of the saturated steam is prevented from damaging the blades of the steam turbine, and the shutdown times and the maintenance workload are greatly reduced.
In addition to the above embodiments, the present invention may have other embodiments. All technical solutions formed by adopting equivalent substitutions or equivalent transformations fall within the protection scope of the claims of the present invention.
Claims (7)
1. The utility model provides a device for converter waste heat steam high efficiency power generation, includes converter (1), converter vaporization flue (2) and converter steam pocket (3) that link to each other, and converter steam pocket (3) link to each other with the steam inlet of a heat accumulator (4), its characterized in that:
the steam outlet of the heat accumulator (4) is connected with the inlet of a filter (5), and the outlet of the filter (5) is connected with a heat energy circulating device (6);
the heat energy circulating device (6) comprises a superheater (7), an economizer (8) and a flue gas and air system (9), the cavity of the heat energy circulating device (6) is divided into a high-temperature bin (6 a) and a heat exchange bin (6 b) which are connected, the superheater (7) is arranged in the high-temperature bin (6 a), the economizer (8) is arranged in the heat exchange bin (6 b), the air inlet of the superheater (7) is connected with the outlet of a filter (5), the air outlet of the superheater is connected with the steam inlet of a turbonator (10), the steam outlet of the turbonator (10) is connected with a condenser (11), the condenser (11) is connected with the water inlet of a condensate pump (12), the water outlet of the condensate pump (12) is connected with the inlet of the economizer (8), the outlet of the economizer (8) is connected with the water inlet of a deaerator (13), the water outlet of the deaerator (13) is connected with a converter steam drum (3) through a return pipe (14), and the return pipe (14) is provided with a pressure pump (15);
the smoke and air system (9) comprises a circulating fan (91), a circulating air valve (92), a smoke exhaust valve (93) and a burner (94), an air inlet of the circulating fan (91) is connected with a heat exchange bin (6 b) of the heat energy circulating device (6), an air outlet is respectively connected with a recovery pipe (16) and a smoke exhaust pipe (17), the recovery pipe (16) is connected with a high temperature bin (6 a) of the heat energy circulating device (6), the circulating air valve (92) is arranged on the recovery pipe (16), the smoke exhaust pipe (17) is connected with an external exhaust chimney (18), the smoke exhaust pipe (17) is provided with the smoke exhaust valve (93), the burner (94) is connected with the high temperature bin (6 a) of the heat energy circulating device (6), and the burner is provided with a group of gas pipelines (19) and an air pipeline (20) which are connected with an external gas supply system.
2. The apparatus for high efficiency power generation by using steam generated by using converter waste heat according to claim 1, wherein:
furthermore, a drain valve (21) is arranged at the lower part of the filter (5), and the drain valve (21) is connected with the deaerator (13) through a strainer (22).
3. The apparatus for high-efficiency power generation by using steam generated by using converter waste heat according to claim 1 or 2, characterized in that:
the burner (94) is a semi-flameless burner.
4. The apparatus for high-efficiency power generation by using steam generated by using converter waste heat according to claim 1 or 2, characterized in that:
and the filter element of the filter (5) is made of stainless steel.
5. The apparatus for high-efficiency power generation by using steam generated by using converter waste heat according to claim 1 or 2, characterized in that:
the fuel of the burner (94) can be blast furnace gas, converter gas, coke oven gas or a combination of the three.
6. The method for efficiently generating power by using the steam generated by the waste heat of the converter by using the device as claimed in claim 1 or 2 comprises the following specific processes:
the method comprises the following steps: converter waste heat steam is changed into saturated steam with smaller continuous pressure fluctuation and the temperature of 170-190 ℃ through the heat accumulator (4);
step two: then, water is filtered by a filter (5) and then sent into a superheater (7), and meanwhile, high-temperature flue gas with the temperature of 600-650 ℃ in a high-temperature bin (6 a) exchanges heat with steam in the superheater (7);
step three: sending the superheated steam with the temperature of 370-390 ℃ after heat exchange to a turbonator (10) for power generation, and sending the flue gas with the temperature of 300-350 ℃ after heat exchange to a heat exchange bin (6 b);
step four: the low-temperature and low-pressure steam after power generation is cooled into condensed water by a condenser (11), and the condensed water is sent to an economizer (8) by a condensed water pump (12) and carries out secondary heat exchange with the flue gas with the temperature of 300-350 ℃;
step five: and the steam after the secondary heat exchange is sent to a deaerator (13), then is sent to a converter vaporization system through a return pipe (14) by a pressure pump (15) for recycling, the temperature of the flue gas after the secondary heat exchange reaches 200-250 ℃, one part of the flue gas is pressurized by a circulating fan (91) and then is sent back to a high-temperature bin (6 a) to be mixed with the high-temperature flue gas generated by a burner (94) for recycling, and the other part of the flue gas is discharged outwards by a smoke discharge pipe (17).
7. The method for efficient power generation by steam using converter waste heat according to claim 6, characterized in that:
the temperature of the superheated steam in the third step is preferably 370-380 ℃.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
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| CN202010181950.4A CN111288810A (en) | 2020-03-16 | 2020-03-16 | Device and method for efficiently generating power by using waste heat steam of converter |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202010181950.4A CN111288810A (en) | 2020-03-16 | 2020-03-16 | Device and method for efficiently generating power by using waste heat steam of converter |
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| CN111288810A true CN111288810A (en) | 2020-06-16 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115900376A (en) * | 2023-02-20 | 2023-04-04 | 南京金瀚环保科技有限公司 | Converter saturated steam reheating type power generation device and method thereof |
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2020
- 2020-03-16 CN CN202010181950.4A patent/CN111288810A/en active Pending
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115900376A (en) * | 2023-02-20 | 2023-04-04 | 南京金瀚环保科技有限公司 | Converter saturated steam reheating type power generation device and method thereof |
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