CN104764331A - Organic rankine afterheat power generation method of electric furnace smoke - Google Patents
Organic rankine afterheat power generation method of electric furnace smoke Download PDFInfo
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- CN104764331A CN104764331A CN201410016810.6A CN201410016810A CN104764331A CN 104764331 A CN104764331 A CN 104764331A CN 201410016810 A CN201410016810 A CN 201410016810A CN 104764331 A CN104764331 A CN 104764331A
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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
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- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P10/00—Technologies related to metal processing
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Abstract
The invention discloses an organic rankine afterheat power generation method of electric furnace smoke. Smoke exhausted in an electric furnace is exhausted from a fourth hole, is mixed into cold wind by a water cooling slide sleeve, enters a heat accumulation temperature equalizer, and enters a flow equalization heat accumulation chamber; the cooled smoke is discharged from a booster fan, and is mixed with the smoke discharged from a discharge pipe connected above a semi-closed electric furnace to enter a plastic burning plate dust remover; the smoke is pressed into an exhaust cylinder by a main fan after the dust removal, and is discharged into atmosphere; and meanwhile, organic working medium liquid absorbs the heat of a smoke afterheat carrier in a low-pressure evaporator, a medium-pressure evaporator and a high-pressure evaporator to become working medium steam so as to perform the expansion acting in an organic turbine with a steam port and to drive a generator to generate electricity. The method is characterized by adopting R600a as organic circulating working medium. The method can recover the heat energy in the smoke to the greatest extent to directly convert to high-grade electric energy; the heat efficiency is improved by 30-35% compared with single-level evaporation organic rankine cycle; and the environmental protecting effect is good.
Description
Technical field
The present invention relates to a kind of electric furnace flue gas organic Rankine method for power generation by waste heat, 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 electric stove dust technical field.
Background technology
The purifier of electric furnace flue gas is electric furnace flue gas generation equipment in the prior art, waste heat utilization facility, sinter-plate precipitator 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 electric furnace flue gas, produces saturated vapor etc.Due to the fluctuation of electric furnace flue gas high temperature, dustiness is large, and light water tubulation waste heat boiler is difficult to the waste heat recovery applying to electric furnace flue gas.At present, heat accumulating type waste-heat boiler Successful utilization in electric 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 electric 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 electric furnace flue gas organic Rankine method for power generation by waste heat, 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 electric furnace production.
The technical solution adopted in the present invention is as follows:
Electric furnace flue gas organic Rankine method for power generation by waste heat, it is characterized in that: in electric 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 thermal storage temperature equalizer, described thermal storage temperature equalizer comprises gas approach, composite carbon-copper material heat storage, sound wave ash cleaner, exhanst gas outlet and ash bucket, described composite carbon-copper material heat storage is arranged between gas approach and exhanst gas outlet, described sound wave ash cleaner step-by-step arrangement is between composite carbon-copper material heat storage, by composite carbon-copper material heat storage in thermal storage temperature equalizer to after the heat-accumulating and temperature-equalizing effect of high-temperature flue gas, flue gas enters in current-sharing regenerator, 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 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 current-sharing regenerator, 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 condensed into saturated liquid by shell-and-tube cooler, 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 shell-and-tube cooler 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 shell-and-tube cooler through water circulating pump, start new round circulation.
It is further characterized in that: adopt R600a to be circulation organic working medium.
The invention has the beneficial effects as follows: because thermal storage temperature equalizer can to flue-gas temperature peak load shifting, reduce the maximum temperature of flue gas, reduce the fluctuating range of flue-gas temperature, alleviate the rapid drawdown that rises sharply of flue-gas temperature, thus the investment of device for generating power by waste heat can be reduced, improve the stability of device for generating power by waste heat, and all kinds of waste heat power generation equipment can be configured safely.
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 electric 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 electric 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 electric furnace flue gas waste heat is utilized to produce high steam, enter the high pressure cylinder expansion acting of organic turbine, realize electric 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 30 ~ 35%, 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. thermal storage temperature equalizer to flue-gas temperature peak load shifting, can reduce the maximum temperature of flue gas, reduces the fluctuating range of flue-gas temperature, alleviate the rapid drawdown that rises sharply of flue-gas temperature, solve problem of expanding with heat and contract with cold;
2. adopt the cogeneration of multistage evaporation organic Rankine bottoming cycle to reclaim the waste heat of electric furnace flue gas, the comparable single-stage evaporation organic Rankine bottoming cycle of its thermal efficiency improves 30 ~ 35%;
3. 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;
4. working medium fluid reservoir, can guarantee working medium circulating pump continuous pressure;
5. improve device for generating power by waste heat efficiency;
6. reduce device for generating power by waste heat investment;
7. operation energy consumption is low, good purification.
Accompanying drawing explanation
Fig. 1 realizes process chart of the present invention.
In Fig. 1: 1. electric furnace, 2. water-cooled sliding sleeve, 3. combustion settling chamber, 4. outer discharge pipe, 5. thermal storage temperature equalizer, 6. gas approach, 7. composite carbon-copper material heat storage, 8. ash bucket, 9. sound wave ash cleaner, 10. exhanst gas outlet, 11. current-sharing regenerator, 12. hiigh pressure stage evaporimeters, 13. medium pressure grade evaporimeters, 14. low-pressure stage evaporimeters, 15. booster fans, 16. sinter-plate precipitators, 17. main air blowers, 18. aiutages, 19. low-pressure stage working medium force (forcing) pumps, 20. medium pressure grade working medium force (forcing) pumps, 21. hiigh pressure stage working medium force (forcing) pumps, 22. fluid reservoirs, the organic turbine of 23. band filling mouth, 24. threephase generators, 25. water circulating pumps, 26. shell-and-tube coolers, 27. lithium-bromide absorption-type refrigerating machines.
Detailed description of the invention
Below in conjunction with accompanying drawing, the invention will be further described:
As shown in Figure 1: electric furnace flue gas organic Rankine method for power generation by waste heat step of the present invention is as follows:
Smoke discharging flow 20 × 10 in 70t/h steel-smelting electric 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 thermal storage temperature equalizer 5, described thermal storage temperature equalizer 5 comprises gas approach 6, composite carbon-copper material heat storage 7, sound wave ash cleaner 9, exhanst gas outlet 10 and ash bucket 8, described composite carbon-copper material heat storage 7 is arranged between gas approach 6 and exhanst gas outlet 10, described sound wave ash cleaner 9 step-by-step arrangement is between composite carbon-copper material heat storage 7, after heat-accumulating and temperature-equalizing effect by composite carbon-copper material heat storage 7 pairs of high-temperature flue gas in thermal storage temperature equalizer 5, flue gas enters in current-sharing regenerator 11, 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 electric furnace 1 by booster fan 15 and enters sinter-plate precipitator 16 in the lump, dust concentration 3mg/Nm after dedusting
3, be pressed into aiutage 18 by main air blower 17 and enter air, simultaneously, through the organic working medium liquid of condensation, through the driving of low-pressure stage working medium force (forcing) pump 19, first being installed on the heat absorbing fume afterheat carrier in the low-pressure stage evaporimeter 14 in current-sharing regenerator 11, become low-pressure stage working substance steam, one tunnel enters the low pressure filling mouth of the organic turbine 23 of band filling mouth through pipeline, another road is after the pressurization of medium pressure grade working medium force (forcing) pump 20, enter the heat absorbing fume afterheat carrier in medium pressure grade evaporimeter 13, become medium pressure grade working substance steam, one tunnel enters in the organic turbine 23 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 21, enter the heat absorbing fume afterheat carrier in hiigh pressure stage evaporimeter 12, become hiigh pressure stage working substance steam, the high-pressure admission cylinder of the organic turbine 23 of band filling mouth is entered through pipeline, working substance steam is expansion work in multistage organic turbine 23, and drive threephase generator 24 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 23 of band filling mouth is condensed into saturated liquid by shell-and-tube cooler 26, enter fluid reservoir 22, fluid reservoir 22 can guarantee low-pressure stage working medium force (forcing) pump 19 continuous pressure, send in low-pressure stage evaporimeter 14 after worker quality liquid being pressurizeed by low-pressure stage working medium force (forcing) pump 19 again, start new round circulation, from shell-and-tube cooler 26 recirculated water out, cooled by lithium-bromide absorption-type refrigerating machine 27, 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 shell-and-tube cooler 26 through water circulating pump 25, start new round circulation.
Described low boiling organic working medium is R600a, three grades of evaporations, low-pressure stage evaporating pressure is 0.282MPa, medium pressure grade evaporating pressure is 1.19MPa, hiigh pressure stage evaporating pressure is 2.18MPa, and when the power pressure after expansion work is 0.36MPa, system electromotive power output is 2000KW, Rankine cycle efficiency is 25.6%, 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 electric 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 the waste heat recovery of 70t/h steel-smelting electric furnace 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 30 ~ 35%, the environment protecting that can also reach.
Claims (2)
1. electric furnace flue gas organic Rankine method for power generation by waste heat, it is characterized in that: in electric 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 thermal storage temperature equalizer, described thermal storage temperature equalizer comprises gas approach, composite carbon-copper material heat storage, sound wave ash cleaner, exhanst gas outlet and ash bucket, described composite carbon-copper material heat storage is arranged between gas approach and exhanst gas outlet, described sound wave ash cleaner step-by-step arrangement is between composite carbon-copper material heat storage, by composite carbon-copper material heat storage in thermal storage temperature equalizer to after the heat-accumulating and temperature-equalizing effect of high-temperature flue gas, flue gas enters in current-sharing regenerator, 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 current-sharing regenerator, 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 condensed into saturated liquid by shell-and-tube cooler, 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 shell-and-tube cooler 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 shell-and-tube cooler through water circulating pump, start new round circulation.
2. electric furnace flue gas organic Rankine method for power generation by waste heat according to claim 1, is characterized in that: adopt R600a to be circulation organic working medium.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201410016810.6A CN104764331A (en) | 2014-01-06 | 2014-01-06 | Organic rankine afterheat power generation method of electric furnace smoke |
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| CN201410016810.6A CN104764331A (en) | 2014-01-06 | 2014-01-06 | Organic rankine afterheat power generation method of electric furnace smoke |
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| CN104764331A true CN104764331A (en) | 2015-07-08 |
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Application publication date: 20150708 |