CN105318727A - Method for utilizing residual heat of flue gas from metallurgical furnace - Google Patents
Method for utilizing residual heat of flue gas from metallurgical furnace Download PDFInfo
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- CN105318727A CN105318727A CN201410382521.8A CN201410382521A CN105318727A CN 105318727 A CN105318727 A CN 105318727A CN 201410382521 A CN201410382521 A CN 201410382521A CN 105318727 A CN105318727 A CN 105318727A
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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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- 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
- Y02P80/00—Climate change mitigation technologies for sector-wide applications
- Y02P80/10—Efficient use of energy, e.g. using compressed air or pressurized fluid as energy carrier
- Y02P80/15—On-site combined power, heat or cool generation or distribution, e.g. combined heat and power [CHP] supply
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Abstract
The invention discloses a method for utilizing residual heat of flue gas from a metallurgical furnace. The method is characterized in that the flue gas exhausted in the metallurgical furnace is exhausted from a fourth hole, is mixed into cold-blast air through a water-cooled sliding sleeve, enters a settling chamber, and enters a residual heat exchange chamber; high-temperature flue gas releases heat; the cooled flue gas comes out from a booster fan, and is mixed with flue gas coming out from an external exhaust pipeline connected above an electric furnace to enter a sinter board dust catcher together, and is pressed in an exhaust funnel by a main air blower to be discharged into the atmosphere after being subjected to dust removal; meanwhile, an organic working-medium liquid absorbs the heat of a residual heat carrier of the flue gas in a low-pressure-stage evaporator, an intermediate-pressure-stage evaporator and a high-pressure-stage evaporator, becomes working-medium steam, applies work in an expansion manner in an organic turbine with a steam supplementing opening, and drives a generator to generate electricity. The method is characterized in that R290 is adopted as a circulating organic working medium. By using the method provided by the invention, heat energy in the flue gas can be recycled furthest, and can be directly converted into high-grade electric energy; the heat efficiency of the method is increased by 31% to 36% compared with that of a single-stage evaporation organic Rankine cycle; an environmental protection effect is good.
Description
Technical field
The present invention relates to a kind of metallurgical furnace flue gas residual-heat utilization method, can the thermal energy to greatest extent in recovered flue gas be specifically high-grade electric energy, can dust collection capacity be improved again, belong to metallurgical furnace dedusting technical field.
Background technology
The purifier of metallurgical furnace flue gas is metallurgical furnace flue gas generation equipment in the prior art, waste heat utilization facility, deduster connected successively by pipeline.
Usually the waste heat utilization facility adopted at present: water row tube waste heat boiler, heat accumulating type waste-heat boiler reclaim the waste heat of metallurgical furnace flue gas, produces saturated vapor etc.Due to the fluctuation of metallurgical furnace flue gas high temperature, dustiness is large, and light water tubulation waste heat boiler is difficult to the waste heat recovery applying to metallurgical furnace flue gas.At present, heat accumulating type waste-heat boiler Successful utilization in metallurgical furnace flue gas waste heat recovery, but due to the inherent shortcoming (high, not freeze proof, the non-refractory of cost, service life short) of heat exchanger tube, make heat accumulating type waste-heat boiler also face a lot of problem at the universal of steel industry.
Meanwhile, because metallurgical furnace flue gas temperature fluctuation is violent, wave amplitude is large, and residual heat system just must design enough large, guarantees that high-temperature flue gas also can effective cooling.But actual steam output is far below the evaporation capacity of residual heat system, there is the situation of low load with strong power.This just relatively reduces the economic worth of residual heat system, adds the investment of residual heat system.
Summary of the invention
For the problems referred to above, the invention provides metallurgical furnace flue gas residual-heat utilization method, can not only cooling high temperature flue gas efficiently by the method, can also the thermal energy to greatest extent in recovered flue gas be high-grade electric energy, drag dedusting fan, the exhaust temperature of flue gas can be reduced simultaneously, improve dust collection capacity, and not affect the stable and continuous of metallurgical furnace production.
The technical solution adopted in the present invention is as follows:
Metallurgical furnace flue gas residual-heat utilization method, it is characterized in that: in metallurgical furnace of the present invention, smoke discharging is discharged by the 4th hole, cold wind is mixed into through water-cooled sliding sleeve, combustion settling chamber is entered after combusting carbon monoxide 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 be suitably mixed into cold wind, finally burn CO gas, flue gas through combustion settling chamber enters cyclone dust collectors, carry out pre-dedusting, then enter in residual heat exchanging chamber, high-temperature flue gas releases heat, temperature is down to 80 DEG C, flue gas through cooling out to be mixed with the outer discharge pipe flue gas be out connected to above metallurgical furnace by booster fan and enters sinter-plate precipitator in the lump, dust concentration 3mg/Nm after dedusting
3, be pressed into aiutage by main air blower and enter air, simultaneously, through the organic working medium liquid of condensation, through the driving of low-pressure stage working medium force (forcing) pump, first being installed on the heat absorbing fume afterheat carrier in the low-pressure stage evaporimeter in residual heat exchanging chamber, become low-pressure stage working substance steam, one tunnel enters the low pressure filling mouth of the organic turbine of band filling mouth through pipeline, another road is after the pressurization of medium pressure grade working medium force (forcing) pump, enter the heat absorbing fume afterheat carrier in medium pressure grade evaporimeter, become medium pressure grade working substance steam, one tunnel enters in the organic turbine of band filling mouth through pipeline and presses filling mouth, another road is after the pressurization of hiigh pressure stage working medium force (forcing) pump, enter the heat absorbing fume afterheat carrier in hiigh pressure stage evaporimeter, become hiigh pressure stage working substance steam, the high-pressure admission cylinder of the organic turbine of band filling mouth is entered through pipeline, working substance steam is expansion work in multistage organic turbine, and drive threephase generator to generate electricity, the electric energy that system sends is three-phase alternating current, rated voltage is 380V, electrical network in factory is incorporated to after caning be passed through pressure regulation, or directly give electrical equipment use, the working substance steam of discharging from the organic turbine of band filling mouth is saturated liquid by aluminium fin-plate type condenser condenses, enter fluid reservoir, fluid reservoir can guarantee low-pressure stage working medium force (forcing) pump continuous pressure, send in low-pressure stage evaporimeter after worker quality liquid being pressurizeed by low-pressure stage working medium force (forcing) pump again, start new round circulation, from aluminium fin-plate type condenser recirculated water out, cooled by lithium-bromide absorption-type refrigerating machine, the temperature of cooling water is down to 10 ~ 15 DEG C, meet working substance steam and be condensed into the requirement of saturated liquid to cooling water, send in aluminium fin-plate type condenser through water circulating pump, start new round circulation.
It is further characterized in that: adopt R290 to be circulation organic working medium.
The invention has the beneficial effects as follows: the present invention is high in organic working medium, in, the measure of multistage evaporation is adopted in low evaporimeter, the low-temperature zone heating of metallurgical furnace flue gas waste heat is utilized to produce low-pressure steam, enter the low pressure filling mouth expansion work of organic turbine, the middle-temperature section heating of metallurgical furnace flue gas waste heat is utilized to produce middle pressure steam, enter the middle pressure filling mouth expansion work of organic turbine, the high temperature section heating of metallurgical furnace flue gas waste heat is utilized to produce high steam, enter the high pressure cylinder expansion acting of organic turbine, realize metallurgical furnace flue gas waste heat to heat the step dividing potential drop of organic working medium, in heating surface at different levels, so just decrease the lack of uniformity of the heat transfer temperature difference between residual heat stream and working medium, reduce the entropy increasing because different transfer of heat irreversible loss brings, the comparable single-stage evaporation organic Rankine bottoming cycle of its thermal efficiency improves 31 ~ 36%, reduce the exhaust temperature of flue gas, because the exhaust temperature of flue gas can maintain 80 DEG C, filtrate in sinter-plate precipitator can select the filtrate that price is low, reduce investment and operating cost, concentration of emission is low, can guarantee that discharge dust concentration is at 3mg/Nm
3.
Compared with the prior art the present invention has the following advantages:
1. adopt the cogeneration of multistage evaporation organic Rankine bottoming cycle to reclaim the waste heat of metallurgical furnace flue gas, the comparable single-stage evaporation organic Rankine bottoming cycle of its thermal efficiency improves 31 ~ 36%;
2. cooled by lithium-bromide absorption-type refrigerating machine, the temperature of cooling water is down to 10 ~ 15 DEG C, meets working substance steam and is condensed into the requirement of saturated liquid to cooling water;
3. working medium fluid reservoir, can guarantee working medium circulating pump continuous pressure;
4. improve device for generating power by waste heat efficiency;
5. reduce device for generating power by waste heat investment;
6. operation energy consumption is low, good purification.
Accompanying drawing explanation
Fig. 1 realizes process chart of the present invention.
In Fig. 1: 1. metallurgical furnace, 2. water-cooled sliding sleeve, 3. combustion settling chamber, 4. outer discharge pipe, 5. residual heat exchanging chamber, 6. hiigh pressure stage evaporimeter, 7. medium pressure grade evaporimeter, 8. low-pressure stage evaporimeter, 9. booster fan, 10. sinter-plate precipitator, 11. main air blowers, 12. aiutages, 13. low-pressure stage working medium force (forcing) pumps, 14. medium pressure grade working medium force (forcing) pumps, 15. hiigh pressure stage working medium force (forcing) pumps, 16. fluid reservoirs, the organic turbine of 17. band filling mouth, 18. threephase generators, 19. water circulating pumps, 20. aluminium fin-plate type condensers, 21. lithium-bromide absorption-type refrigerating machines, 22. cyclone dust collectors.
Detailed description of the invention
Below in conjunction with accompanying drawing, the invention will be further described:
As shown in Figure 1: metallurgical furnace flue gas residual-heat utilization method step of the present invention is as follows:
Smoke discharging flow 18 × 10 in 50t/h steel-making metallurgical furnace 1
4nm
3/ h, temperature 1000 DEG C, dust content 25g/Nm
3discharged by the 4th hole, be mixed into cold wind through water-cooled sliding sleeve 2, after combusting carbon monoxide gas, enter combustion settling chamber 3, 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 be suitably mixed into cold wind, finally burn CO gas, flue gas through combustion settling chamber 3 enters cyclone dust collectors 22, carry out pre-dedusting, then enter in residual heat exchanging chamber 5, high-temperature flue gas releases heat, temperature is down to 80 DEG C, flue gas through cooling out to be mixed with outer discharge pipe 4 flue gas be out connected to above metallurgical furnace 1 by booster fan 9 and enters sinter-plate precipitator 10 in the lump, dust concentration 3mg/Nm after dedusting
3, be pressed into aiutage 12 by main air blower 11 and enter air, simultaneously, through the organic working medium liquid of condensation, through the driving of low-pressure stage working medium force (forcing) pump 13, first being installed on the heat absorbing fume afterheat carrier in the low-pressure stage evaporimeter 8 in residual heat exchanging chamber 5, become low-pressure stage working substance steam, one tunnel enters the low pressure filling mouth of the organic turbine 17 of band filling mouth through pipeline, another road is after the pressurization of medium pressure grade working medium force (forcing) pump 14, enter the heat absorbing fume afterheat carrier in medium pressure grade evaporimeter 7, become medium pressure grade working substance steam, one tunnel enters in the organic turbine 17 of band filling mouth through pipeline and presses filling mouth, another road is after the pressurization of hiigh pressure stage working medium force (forcing) pump 15, enter the heat absorbing fume afterheat carrier in hiigh pressure stage evaporimeter 6, become hiigh pressure stage working substance steam, the high-pressure admission cylinder of the organic turbine 17 of band filling mouth is entered through pipeline, working substance steam is expansion work in multistage organic turbine 17, and drive threephase generator 18 to generate electricity, the electric energy that system sends is three-phase alternating current, rated voltage is 380V, electrical network in factory is incorporated to after caning be passed through pressure regulation, or directly give electrical equipment use, the working substance steam of discharging from the organic turbine 17 of band filling mouth is condensed into saturated liquid by aluminium fin-plate type condenser 20, enter fluid reservoir 16, fluid reservoir 16 can guarantee low-pressure stage working medium force (forcing) pump 13 continuous pressure, send in low-pressure stage evaporimeter 8 after worker quality liquid being pressurizeed by low-pressure stage working medium force (forcing) pump 13 again, start new round circulation, from aluminium fin-plate type condenser 20 recirculated water out, cooled by lithium-bromide absorption-type refrigerating machine 21, the temperature of cooling water is down to 10 ~ 15 DEG C, meet working substance steam and be condensed into the requirement of saturated liquid to cooling water, send in aluminium fin-plate type condenser 20 through water circulating pump 19, start new round circulation.
Described low boiling organic working medium is R290, three grades of evaporations, low-pressure stage evaporating pressure is 0.182MPa, medium pressure grade evaporating pressure is 1.09MPa, hiigh pressure stage evaporating pressure is 2.58MPa, and when the power pressure after expansion work is 0.46MPa, system electromotive power output is 2500KW, Rankine cycle efficiency is 27.6%, and the flue-gas temperature that system is discharged is 80 DEG C.
Maximum feature of the present invention is the measure adopting organic working medium multistage evaporation in high, medium and low evaporimeter, reclaim the waste heat of metallurgical furnace flue gas, by lithium-bromide absorption-type refrigerating machine cooling from shell-and-tube cooler recirculated cooling water out, the temperature of cooling water is down to 10 ~ 15 DEG C, meets working substance steam and is condensed into the requirement of saturated liquid to cooling water.
For 50t/h steel-making metallurgical furnace waste heat recovery and dust collecting process, the inventive method compares with conventional method, is described as follows:
Note: work per year and calculate for 330th.
As can be seen here, the inventive method smoke dust discharge concentration is low, and plant investment is low, operation energy consumption is low, good purification.
The inventive method can be converted into high-grade electric energy by the heat energy to greatest extent in recovered flue gas, and its thermal efficiency ratio single-stage evaporation organic Rankine bottoming cycle improves 31 ~ 36%, the environment protecting that can also reach.
Claims (2)
1. metallurgical furnace flue gas residual-heat utilization method, it is characterized in that: in metallurgical furnace of the present invention, smoke discharging is discharged by the 4th hole, cold wind is mixed into through water-cooled sliding sleeve, combustion settling chamber is entered after combusting carbon monoxide 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 be suitably mixed into cold wind, finally burn CO gas, flue gas through combustion settling chamber enters cyclone dust collectors, carry out pre-dedusting, then enter in residual heat exchanging chamber, high-temperature flue gas releases heat, temperature is down to 80 DEG C, flue gas through cooling out to be mixed with the outer discharge pipe flue gas be out connected to above semi-hermetic electric furnace by booster fan and enters sinter-plate precipitator in the lump, dust concentration 3mg/Nm after dedusting
3, be pressed into aiutage by main air blower and enter air, simultaneously, through the organic working medium liquid of condensation, through the driving of low-pressure stage working medium force (forcing) pump, first being installed on the heat absorbing fume afterheat carrier in the low-pressure stage evaporimeter in residual heat exchanging chamber, become low-pressure stage working substance steam, one tunnel enters the low pressure filling mouth of the organic turbine of band filling mouth through pipeline, another road is after the pressurization of medium pressure grade working medium force (forcing) pump, enter the heat absorbing fume afterheat carrier in medium pressure grade evaporimeter, become medium pressure grade working substance steam, one tunnel enters in the organic turbine of band filling mouth through pipeline and presses filling mouth, another road is after the pressurization of hiigh pressure stage working medium force (forcing) pump, enter the heat absorbing fume afterheat carrier in hiigh pressure stage evaporimeter, become hiigh pressure stage working substance steam, the high-pressure admission cylinder of the organic turbine of band filling mouth is entered through pipeline, working substance steam is expansion work in multistage organic turbine, and drive threephase generator to generate electricity, the electric energy that system sends is three-phase alternating current, rated voltage is 380V, electrical network in factory is incorporated to after caning be passed through pressure regulation, or directly give electrical equipment use, the working substance steam of discharging from the organic turbine of band filling mouth is saturated liquid by aluminium fin-plate type condenser condenses, enter fluid reservoir, fluid reservoir can guarantee low-pressure stage working medium force (forcing) pump continuous pressure, send in low-pressure stage evaporimeter after worker quality liquid being pressurizeed by low-pressure stage working medium force (forcing) pump again, start new round circulation, from aluminium fin-plate type condenser recirculated water out, cooled by lithium-bromide absorption-type refrigerating machine, the temperature of cooling water is down to 10 ~ 15 DEG C, meet working substance steam and be condensed into the requirement of saturated liquid to cooling water, send in aluminium fin-plate type condenser through water circulating pump, start new round circulation.
2. metallurgical furnace flue gas residual-heat utilization method according to claim 1, is characterized in that: adopt R290 to be circulation organic working medium.
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| CN201410382521.8A CN105318727A (en) | 2014-07-30 | 2014-07-30 | Method for utilizing residual heat of flue gas from metallurgical furnace |
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| CN201410382521.8A CN105318727A (en) | 2014-07-30 | 2014-07-30 | Method for utilizing residual heat of flue gas from metallurgical furnace |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114941959A (en) * | 2022-07-21 | 2022-08-26 | 秦皇岛信能能源设备有限公司 | Waste heat island system based on wheel hub production line |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114941959A (en) * | 2022-07-21 | 2022-08-26 | 秦皇岛信能能源设备有限公司 | Waste heat island system based on wheel hub production line |
| CN114941959B (en) * | 2022-07-21 | 2022-10-04 | 秦皇岛信能能源设备有限公司 | Waste heat island system based on wheel hub production line |
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