CN104748565A - Electric furnace smoke waste heat power generation energy saving dust removing method - Google Patents
Electric furnace smoke waste heat power generation energy saving dust removing method Download PDFInfo
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- CN104748565A CN104748565A CN201410010862.2A CN201410010862A CN104748565A CN 104748565 A CN104748565 A CN 104748565A CN 201410010862 A CN201410010862 A CN 201410010862A CN 104748565 A CN104748565 A CN 104748565A
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Abstract
An electric furnace smoke waste heat power generation energy saving dust removing method is characterized in that electric furnace smoke is exhausted from a fourth hole, cold air is mixed through a water cooling sliding sleeve, the smoke enters a settling chamber, a heat storage average-temperature device and a flow-equalizing heat storage chamber, the cooled smoke goes out of a booster fan and is mixed with smoke out of an outer exhaust pipeline connected above an electric furnace, the mixed smoke enters a sinter board dust catcher, after dust removing, the smoke is pressed into an exhaust funnel by a main fan and is exhausted into the atmosphere, meanwhile, circulating water absorbs heat of the smoke from a heat exchanger, a steam-water mixture is formed and enters an evaporator, heat is emitted, organic working medium liquid absorbs heat of the steam-water mixture and becomes working medium steam, expanding working is carried out in an organic turbine with a steam supplement opening, and a power generator is driven to generate power. The electric furnace smoke waste heat power generation energy saving dust removing method is characterized in that R717 is used as a circulation organic working medium. According to the method, heat energy in the smoke can be recycled to the maximum degree and is directly converted into high-grade electric energy, the heat efficiency is improved by 25%-30% compared with the single-stage evaporation organic Rankine cycle, and environment-protecting effect is good.
Description
Technical field
The present invention relates to a kind of electric furnace flue gas cogeneration energy-saving dedusting 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 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 cogeneration energy-saving dedusting 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 electric furnace production.
The technical solution adopted in the present invention is as follows:
Electric furnace flue gas cogeneration energy-saving dedusting method, 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, carbon iron composite material heat storage, sound wave ash cleaner, exhanst gas outlet and ash bucket, described carbon iron composite material heat storage is arranged between gas approach and exhanst gas outlet, described sound wave ash cleaner step-by-step arrangement is between carbon iron composite material heat storage, by carbon iron composite 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 about 100 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, recirculated water is driven by heat exchanger feed pump, enter the heat absorbing flue gas in the heat-pipe heat exchanger be installed in current-sharing regenerator, form steam water interface, the temperature of steam water interface 180 DEG C, steam water interface Natural Circulation try hard to recommend dynamic under enter in hiigh pressure stage evaporimeter and release heat, temperature is down to 110 DEG C, then enter in medium pressure grade evaporimeter and release heat, water temperature is down to 80 DEG C, enter again in low-pressure stage evaporimeter and release heat, water temperature is down to 50 DEG C, become water at low temperature, water at low temperature flows into circulating water pool, start new round circulation, simultaneously, through the organic working medium liquid of condensation, through the driving of low-pressure stage working medium force (forcing) pump, in low-pressure stage evaporimeter, first absorb the heat of waste heat carrier, 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 waste heat 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 waste heat 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 the organic turbine of band filling mouth, 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 R717 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 and single-stage list press the maximum difference of organic Rankine bottoming cycle to be, the present invention is high in organic working medium, in, the measure of multistage evaporation is adopted in low evaporimeter, utilize the low-temperature zone (import 80 DEG C of hot water, export 50 DEG C) heating working medium generation low pressure working fluid steam, enter the low pressure filling mouth expansion work of organic turbine, utilize the middle-temperature section (import 110 DEG C of hot water, export 80 DEG C) heating working medium produce in press working substance steam, enter the middle pressure filling mouth expansion work of organic turbine, utilize the high temperature section (import 180 DEG C of saturated vapor, export 110 DEG C) heating working medium generation high-pressure working medium steam, enter the high pressure cylinder expansion acting of organic turbine, realize residual heat stream 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 25 ~ 30%, reduce the exhaust temperature of flue gas, because the exhaust temperature of flue gas can maintain 100 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 25 ~ 30%;
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. heat exchange of heat pipe not dust stratification, does not block, the service life of extension device;
6. improve device for generating power by waste heat efficiency;
7. reduce device for generating power by waste heat investment;
8. operation energy consumption is low, good purification.
Accompanying drawing explanation
Fig. 1 realizes process chart of the present invention.
In figure: 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. carbon iron composite material heat storage, 8. ash bucket, 9. sound wave ash cleaner, 10. exhanst gas outlet, 11. current-sharing regenerator, 12. heat-pipe heat exchangers, 13. booster fans, 14. sinter-plate precipitators, 15. main air blowers, 16. aiutages, 17. heat exchanger feed pumps, 18. circulating water pools, 19. low-pressure stage evaporimeters, 20. medium pressure grade evaporimeters, 21. hiigh pressure stage evaporimeters, 22. low-pressure stage working medium force (forcing) pumps, 23. medium pressure grade working medium force (forcing) pumps, 24. hiigh pressure stage working medium force (forcing) pumps, 25. fluid reservoirs, the organic turbine of 26. band filling mouth, 27. threephase generators, 28. water circulating pumps, 29. shell-and-tube coolers, 30. 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 cogeneration energy-saving dedusting method step of the present invention is as follows:
Smoke discharging flow 30 × 10 in 100t/h electric furnace 1
4nm
3/ h, temperature 820 DEG C, dust content 15g/Nm
3discharged by the 4th hole, cold wind is mixed into through water-cooled sliding sleeve 2, combustion settling chamber 3 is entered after combusting carbon monoxide 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 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, carbon iron composite material heat storage 7, sound wave ash cleaner 9, exhanst gas outlet 10 and ash bucket 8, described carbon iron composite 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 carbon iron composite material heat storage 7, after heat-accumulating and temperature-equalizing effect by carbon iron composite 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 about 100 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 13 and enters sinter-plate precipitator 14 in the lump, dust concentration 3mg/Nm after dedusting
3, be pressed into aiutage 16 by main air blower 15 and enter air.Simultaneously, recirculated water is driven by heat exchanger feed pump 17, enter the heat absorbing flue gas in the heat-pipe heat exchanger 12 be installed in current-sharing regenerator 11, form steam water interface, the temperature of steam water interface 180 DEG C, steam water interface Natural Circulation try hard to recommend dynamic under enter in hiigh pressure stage evaporimeter 21 and release heat, temperature is down to 110 DEG C, then enter in medium pressure grade evaporimeter 20 and release heat, water temperature is down to 80 DEG C, enter again in low-pressure stage evaporimeter 19 and release heat, water temperature is down to 50 DEG C, become water at low temperature, water at low temperature flows into circulating water pool 18, start new round circulation, simultaneously, through the organic working medium liquid of condensation, through the driving of low-pressure stage working medium force (forcing) pump 22, in low-pressure stage evaporimeter 19, first absorb the heat of waste heat carrier, become low-pressure stage working substance steam, one tunnel enters the low pressure filling mouth of the organic turbine 26 of band filling mouth through pipeline, another road is after the pressurization of medium pressure grade working medium force (forcing) pump 23, enter the heat absorbing waste heat carrier in medium pressure grade evaporimeter 20, become medium pressure grade working substance steam, one tunnel enters in the organic turbine 26 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 24, enter the heat absorbing waste heat carrier in hiigh pressure stage evaporimeter 21, become hiigh pressure stage working substance steam, the high-pressure admission cylinder of the organic turbine 26 of band filling mouth is entered through pipeline, working substance steam is expansion work in the organic turbine 26 of band filling mouth, and drive threephase generator 27 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 26 of band filling mouth is condensed into saturated liquid by shell-and-tube cooler 29, enter fluid reservoir 25, fluid reservoir 25 can guarantee low-pressure stage working medium force (forcing) pump 22 continuous pressure, send in low-pressure stage evaporimeter 19 after worker quality liquid being pressurizeed by low-pressure stage working medium force (forcing) pump 22 again, start new round circulation.From shell-and-tube cooler 29 recirculated water out, cooled by lithium-bromide absorption-type refrigerating machine 30, 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, send in shell-and-tube cooler 29 through water circulating pump 28, start new round circulation.
Described low boiling organic working medium is R717, three grades of evaporations, low-pressure stage evaporating pressure is 0.65MPa, medium pressure grade evaporating pressure is 0.85MPa, hiigh pressure stage evaporating pressure is 1.95MPa, and when the power pressure after expansion work is 0.20MPa, system electromotive power output is 3000KW, Rankine cycle efficiency is 25%, and the flue-gas temperature that system is discharged is 100 DEG C.
Maximum feature of the present invention adopts the cogeneration of multistage evaporation organic Rankine bottoming cycle to 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 100t/h 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 25 ~ 30%, the environment protecting that can also reach.
Claims (2)
1. electric furnace flue gas cogeneration energy-saving dedusting method, 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, carbon iron composite material heat storage, sound wave ash cleaner, exhanst gas outlet and ash bucket, described carbon iron composite material heat storage is arranged between gas approach and exhanst gas outlet, described sound wave ash cleaner step-by-step arrangement is between carbon iron composite material heat storage, by carbon iron composite 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 about 100 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, recirculated water is driven by heat exchanger feed pump, enter the heat absorbing flue gas in the heat-pipe heat exchanger be installed in current-sharing regenerator, form steam water interface, the temperature of steam water interface 180 DEG C, steam water interface Natural Circulation try hard to recommend dynamic under enter in hiigh pressure stage evaporimeter and release heat, temperature is down to 110 DEG C, then enter in medium pressure grade evaporimeter and release heat, water temperature is down to 80 DEG C, enter again in low-pressure stage evaporimeter and release heat, water temperature is down to 50 DEG C, become water at low temperature, water at low temperature flows into circulating water pool, start new round circulation, simultaneously, through the organic working medium liquid of condensation, through the driving of low-pressure stage working medium force (forcing) pump, in low-pressure stage evaporimeter, first absorb the heat of waste heat carrier, 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 waste heat 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 waste heat 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 the organic turbine of band filling mouth, 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 cogeneration energy-saving dedusting method according to claim 1, is characterized in that: adopt R717 to be circulation organic working medium.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201410010862.2A CN104748565A (en) | 2014-01-01 | 2014-01-01 | Electric furnace smoke waste heat power generation energy saving dust removing method |
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| CN201410010862.2A CN104748565A (en) | 2014-01-01 | 2014-01-01 | Electric furnace smoke waste heat power generation energy saving dust removing method |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113074028A (en) * | 2021-04-22 | 2021-07-06 | 中创清洁能源发展（沈阳）股份有限公司 | Flue gas low-temperature waste heat power generation system utilizing generator set |
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2014
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113074028A (en) * | 2021-04-22 | 2021-07-06 | 中创清洁能源发展（沈阳）股份有限公司 | Flue gas low-temperature waste heat power generation system utilizing generator set |
| CN113074028B (en) * | 2021-04-22 | 2023-05-12 | 中创清洁能源发展（沈阳）股份有限公司 | Flue gas low-temperature waste heat power generation system utilizing generator set |
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Application publication date: 20150701 |