CN103134335A - Electric furnace internally and externally discharged smoke waste heat power generation energy saving dust removing method - Google Patents
Electric furnace internally and externally discharged smoke waste heat power generation energy saving dust removing method Download PDFInfo
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- CN103134335A CN103134335A CN2011103716749A CN201110371674A CN103134335A CN 103134335 A CN103134335 A CN 103134335A CN 2011103716749 A CN2011103716749 A CN 2011103716749A CN 201110371674 A CN201110371674 A CN 201110371674A CN 103134335 A CN103134335 A CN 103134335A
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E20/00—Combustion technologies with mitigation potential
- Y02E20/14—Combined heat and power generation [CHP]
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P10/00—Technologies related to metal processing
- Y02P10/25—Process efficiency
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Abstract
An electric furnace internally and externally discharged smoke waste heat power generation energy saving dust removing method is characterized in that electric furnace internally discharged smoke is discharged from a fourth hole and is mixed with cool air through a cooled water sliding sleeve and after carbon monoxide gas in the smoke is burnt, the smoke enters to a burning setting chamber; the smoke discharged from the burning setting chamber enters to a heat storage temperature equalizing chamber so that the temperature of the smoke is reduced to about 100 DEG C, the smoke after temperature reduction is discharged from a blower fan and is mixed with smoke discharged from an externally discharging pipeline connected above a metallurgical furnace so as to enter into a dust remover and the smoke after dust removing is pressed in an exhaust funnel through a main fan so as to be discharged to the atmosphere. A working medium with a low boiling point absorbs heat of a smoke waste heat carrier in a finned tube evaporator so as to form saturated steam, the saturated steam swells and acts in a turbine, and a three-phase engine is driven to generate electricity. R407c is used as the circulated organic working medium. According to the method, combination of a water tabulation waste heat boiler, a heat storage type heat pipe exchanger and the like is replaced so that system configuration is simplified and heat energy in the smoke can be recovered to the greatest degree and is converted into high grade electric power, and therefore purpose of energy conservation and environment protection can be achieved.
Description
Technical field
The present invention relates to a kind of inside and outside capable of generating power by waste heat of exhaust fume energy-saving dedusting method of electric furnace, specifically the heat energy in recovered flue gas is converted into the high-grade electric energy to greatest extent, can improve dust collection capacity again, belongs to the electric stove dust technical field.
Background technology
The purifier of electric furnace flue gas is that electric furnace flue gas generation, UTILIZATION OF VESIDUAL HEAT IN facility, deduster connect successively by pipeline in the prior art.
Usually the UTILIZATION OF VESIDUAL HEAT IN facility that adopts at present: water row tube waste heat boiler, heat storage type heat-pipe heat exchanger reclaim the waste heat of electric furnace flue gas, produce saturated vapor etc.Due to the big ups and downs of electric furnace flue gas temperature, dustiness is large, and light water tubulation waste heat boiler is difficult to apply to the waste heat recovery of electric furnace flue gas.At present, heat storage type heat-pipe heat exchanger has successfully applied in the electric furnace flue gas waste heat recovery, but due to the inherent shortcoming of heat pipe (cost is high, not freeze proof, non-refractory, service life short), make heat storage type heat-pipe heat exchanger also face a lot of problems at steel industry universal.
Simultaneously, because the electric furnace flue gas temperature fluctuation is violent, wave amplitude is large, and residual heat system just must design enough greatly, guarantees that high-temperature flue gas also can effective cooling.But actual steam output the situation of low load with strong power occurs far below the evaporation capacity of residual heat system.This has just reduced the economic worth of residual heat system relatively, has increased the investment of residual heat system.
Summary of the invention
For the problems referred to above, the invention provides the inside and outside capable of generating power by waste heat of exhaust fume energy-saving dedusting method of electric furnace, by the method cooling high temperature flue gas efficiently, heat energy in recovered flue gas is converted into the high-grade electric energy to greatest extent, can reduce simultaneously the exhaust temperature of flue gas, improve dust collection capacity, obtain good dust removing effects, the dust concentration 8mg/Nm of discharging
3, and do not affect the stable and continuous of electric furnace production.
The technical solution adopted in the present invention is as follows:
The inside and outside capable of generating power by waste heat of exhaust fume energy-saving dedusting method of electric furnace, it is characterized in that: in electric furnace of the present invention, smoke discharging is discharged by the 4th hole, sneaks into cold wind through the water-cooled sliding sleeve, enters combustion settling chamber after the burning CO gas; The effect of combustion settling chamber is: reduce flue gas flow rate, make the big dust particle sedimentation of carrying in flue gas, and suitably sneak into cold wind, finally burn CO gas, 750 ℃ of the flue-gas temperatures of adjusting control expansion chamber; Enter the heat-accumulating and temperature-equalizing chamber by combustion settling chamber flue gas out, temperature is down to 100 ℃ of left and right, out mixed with the outer discharge pipe flue gas out that is connected to metallurgical furnace top by booster fan through the flue gas of cooling and enter in the lump deduster, dust concentration 8mg/Nm after dedusting
3, be pressed into aiutage by main air blower and enter atmosphere.Simultaneously, low boiling working fluid drives by working medium pump, first absorbs the heat of fume afterheat carrier in being installed on the indoor finned-tube evaporator of heat-accumulating and temperature-equalizing, become saturated vapor, after pressure regulator valve, the working substance steam acting of expanding in the low boiling working fluid steam turbine, and drive the threephase generator generating.The working substance steam of discharging from the low boiling working fluid steam turbine is condensed into saturated liquid by shell-and-tube cooler, then sends in finned-tube evaporator the circulation of a beginning new round after by working medium pump, worker quality liquid being pressurizeed.The electric energy that system sends is three-phase alternating current, and rated voltage is 380V, can incorporate electrical network in factory into through after pressure regulation, or directly gives consumer and use.
It is further characterized in that: adopting R407c is the circulation organic working medium.
The invention has the beneficial effects as follows: due to device combinations such as device for generating power by waste heat place of water tubulation waste heat boiler, heat storage type heat-pipe heat exchangers, so plant area is economized, investment and operating cost are low; Heat energy in recovered flue gas is converted into the high-grade electric energy to greatest extent, drags dedusting fan, has reduced system's operation energy consumption; Sensible heat is fully utilized, and has reduced the exhaust temperature of flue gas, and because the exhaust temperature of flue gas can maintain 100 ℃, the filtrate in sack cleaner can be selected cheapest normal temperature cloth bag, has reduced investment and operating cost; Concentration of emission is low, can guarantee to discharge dust concentration at 8mg/Nm
3’
Description of drawings
Fig. 1 is the process chart of realizing the inside and outside capable of generating power by waste heat of exhaust fume energy-saving dedusting method of electric furnace of the present invention.
In Fig. 1: 1. electric furnace, 2. water-cooled sliding sleeve, 3. combustion settling chamber, 4. heat-accumulating and temperature-equalizing chamber, 5. outer discharge pipe, 6. booster fan, 7. deduster, 8. main air blower, 9. aiutage, 10. finned-tube evaporator, 11. low boiling working fluid steam turbines, 12. threephase generators, 13. working medium circulating pump, 14. water pump, 15. shell-and-tube coolers, 16. cooling towers.
The specific embodiment
The invention will be further described below in conjunction with accompanying drawing:
As shown in Figure 1: the inside and outside capable of generating power by waste heat of exhaust fume energy-saving dedusting method step of electric furnace of the present invention is as follows: the interior smoke discharging flow 22 * 10 of 90t/h steel-smelting electric furnace 1
4Nm
3/ h, 1000 ℃ of temperature, dust content 42g/Nm
3Discharged by the 4th hole, sneak into cold wind through water-cooled sliding sleeve 2, enter combustion settling chamber 3 after the burning CO gas; The effect of combustion settling chamber 3 is: reduce flue gas flow rate, make the big dust particle sedimentation of carrying in flue gas, and suitably sneak into cold wind, finally burn CO gas, 750 ℃ of the flue-gas temperatures of adjusting control expansion chamber; Enter heat-accumulating and temperature-equalizing chamber 4 by combustion settling chamber 3 flue gas out, temperature is down to 100 ℃, out mixed with outer discharge pipe 5 flue gas out that is connected to metallurgical furnace 1 top by booster fan 6 through the flue gas of cooling and enter in the lump deduster 7, dust concentration 8mg/Nm after dedusting
3, be pressed into aiutage 9 by main air blower 8 and enter atmosphere.Simultaneously, low boiling working fluid drives by working medium pump 13, first absorb the heat of fume afterheat carrier in being installed on the indoor finned-tube evaporator of heat-accumulating and temperature-equalizing 10, become saturated vapor, after pressure regulator valve, working substance steam is in the interior expansion acting of low boiling working fluid steam turbine 11, and 12 generatings of drive threephase generator.The working substance steam of discharging from low boiling working fluid steam turbine 11 is condensed into saturated liquid by shell-and-tube cooler 15, then sends in finned-tube evaporator 10 circulation of a beginning new round after by working medium pump 13, worker quality liquid being pressurizeed.The electric energy that system sends is three-phase alternating current, and rated voltage is 380V, can incorporate electrical network in factory into through after pressure regulation, or directly gives consumer and use.
Described low boiling working fluid is R407c, the power pressure that enters the low boiling working fluid steam turbine is 2.65MPa, and when the power pressure after the acting of expanding was 0.32MPa, system's electromotive power output was 2500KW, Rankine cycle efficient is 22.5%, and the flue-gas temperature that system discharges is 100 ℃.
Maximum characteristics of the present invention are to adopt low boiling working fluid organic Rankine circulation cogeneration to reclaim the waste heat of electric furnace flue gas.Take the waste heat recovery of 90t/h steel-smelting electric furnace and dust collecting process as example, the inventive method and conventional method relatively are described as follows:
Annotate: work per year and calculated in 330th.
This shows, the inventive method smoke dust discharge concentration is low, and plant investment is low, operation energy consumption is low, good purification.
The inventive method heat energy in recovered flue gas to greatest extent is converted into the high-grade electric energy, can also reach good environment protecting.
Claims (2)
1. the inside and outside capable of generating power by waste heat of exhaust fume energy-saving dedusting method of electric furnace, it is characterized in that: in electric furnace of the present invention, smoke discharging is discharged by the 4th hole, sneaks into cold wind through the water-cooled sliding sleeve, enters combustion settling chamber after the CO gas that burns; The effect of combustion settling chamber is: reduce flue gas flow rate, make the big dust particle sedimentation of carrying in flue gas, and suitably sneak into cold wind, finally burn CO gas, 750 ℃ of the flue-gas temperatures of adjusting control expansion chamber; Enter the heat-accumulating and temperature-equalizing chamber by combustion settling chamber flue gas out, temperature is down to 100 ℃ of left and right, out mixed with the outer discharge pipe flue gas out that is connected to metallurgical furnace top by booster fan through the flue gas of cooling and enter in the lump deduster, dust concentration 8mg/Nm after dedusting
3, be pressed into aiutage by main air blower and enter atmosphere.Simultaneously, low boiling working fluid drives by working medium pump, first absorbs the heat of fume afterheat carrier in being installed on the indoor finned-tube evaporator of heat-accumulating and temperature-equalizing, become saturated vapor, after pressure regulator valve, the working substance steam acting of expanding in the low boiling working fluid steam turbine, and drive the threephase generator generating.The working substance steam of discharging from the low boiling working fluid steam turbine is condensed into saturated liquid by shell-and-tube cooler, then sends in finned-tube evaporator the circulation of a beginning new round after by working medium pump, worker quality liquid being pressurizeed.The electric energy that system sends is three-phase alternating current, and rated voltage is 380V, can incorporate electrical network in factory into through after pressure regulation, or directly gives consumer and use.
2. the inside and outside capable of generating power by waste heat of exhaust fume energy-saving dedusting method of electric furnace according to claim 1, it is characterized in that: adopting R407c is the circulation organic working medium.
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| CN2011103716749A CN103134335A (en) | 2011-11-22 | 2011-11-22 | Electric furnace internally and externally discharged smoke waste heat power generation energy saving dust removing method |
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| CN2011103716749A CN103134335A (en) | 2011-11-22 | 2011-11-22 | Electric furnace internally and externally discharged smoke waste heat power generation energy saving dust removing method |
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| CN103134335A true CN103134335A (en) | 2013-06-05 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112284149A (en) * | 2020-11-03 | 2021-01-29 | 贵州金源锰业有限公司 | High-power electric furnace with waste heat recovery device |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112284149A (en) * | 2020-11-03 | 2021-01-29 | 贵州金源锰业有限公司 | High-power electric furnace with waste heat recovery device |
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Application publication date: 20130605 |