CN104075580A - Method for power generation by utilizing flue gas waste heat of semi-sealed electric furnace - Google Patents
Method for power generation by utilizing flue gas waste heat of semi-sealed electric furnace Download PDFInfo
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- CN104075580A CN104075580A CN201310130469.2A CN201310130469A CN104075580A CN 104075580 A CN104075580 A CN 104075580A CN 201310130469 A CN201310130469 A CN 201310130469A CN 104075580 A CN104075580 A CN 104075580A
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Abstract
A method for power generation by utilizing flue gas waste heat of a semi-sealed electric furnace is characterized in that flue gas in the semi-sealed electric furnace is discharged out of a fourth hole, is mixed into cold air through a water-cooling sliding sleeve, enters a settling chamber, enters a heat storage temperature uniformizing device and enters a flow uniformizing heat storage chamber, the flue gas cooled is discharged out of a booster fan to be mixed with flue gas discharged out of a discharging pipeline connected above the semi-sealed electric furnace to enter a deduster together, the flue gas is pressed into an exhaust drum after being dedusted and is discharged into the atmosphere; meanwhile, organic working medium liquid absorbs heat of a flue gas waste heat carrier in a low-pressure stage evaporator, a medium-pressure stage evaporator and a high-pressure stage evaporator and becomes working medium steam, and the working medium steam does work by expansion in an organic turbine with a steam supplementing port and drives a generator to generate electricity. The method is characterized in that R600a is adopted to serve as a circulating organic working medium. According to the method, thermal energy in the flue gas can be recycled to the largest extent to be directly converted into high-grade electric energy, thermal efficiency according to the method is improved by 30-35% compared with single stage evaporation Rankine cycle, and the environmental protection effect is good.
Description
Technical field
The present invention relates to a kind of semi-hermetic electric furnace flue gas method for power generation by waste heat, specifically the heat energy in recovered flue gas is converted into high-grade electric energy to greatest extent, can improve again dust collection capacity, belongs to semi-hermetic electric stove dust technical field.
Background technology
The purifier of semi-hermetic electric furnace flue gas is that semi-hermetic electric furnace flue gas generation equipment, UTILIZATION OF VESIDUAL HEAT IN facility, deduster connect successively by pipeline in the prior art.
Conventionally the UTILIZATION OF VESIDUAL HEAT IN facility adopting at present: water row tube waste heat boiler, heat accumulating type waste-heat boiler reclaim the waste heat of semi-hermetic electric furnace flue gas, produces saturated vapor etc.Due to the big ups and downs of semi-hermetic 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 semi-hermetic electric furnace flue gas.At present, heat accumulating type waste-heat boiler has successfully applied in the waste heat recovery of semi-hermetic electric furnace flue gas, but due to the inherent shortcoming of heat exchanger tube (cost is high, not freeze proof, non-refractory, service life short), make heat accumulating type waste-heat boiler also face a lot of problems at steel industry universal.
Meanwhile, because the temperature fluctuation of semi-hermetic electric furnace flue gas 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 far below the evaporation capacity of residual heat system, there is the situation of low load with strong power in actual steam output.The economic worth that this has just reduced 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 semi-hermetic electric furnace flue gas method for power generation by waste heat, by the method cooling high temperature flue gas efficiently, heat energy in recovered flue gas is converted into high-grade electric energy to greatest extent, drag dedusting fan, the exhaust temperature that can reduce flue gas simultaneously, improves dust collection capacity, and does not affect the stable and continuous of semi-hermetic electric furnace production.
The technical solution adopted in the present invention is as follows:
Semi-hermetic electric furnace flue gas method for power generation by waste heat, it is characterized in that: in semi-hermetic electric furnace of the present invention, smoke discharging is discharged by the 4th hole, sneak into cold wind through water-cooled sliding sleeve, after burning CO gas, enter combustion settling chamber, 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, 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 the heat-accumulating and temperature-equalizing effect of high-temperature flue gas after, flue gas enters in current-sharing regenerator, high-temperature flue gas is emitted heat, temperature is down to 80 DEG C, out mix and enter in the lump deduster with the outer discharge pipe that is connected to semi-hermetic electric furnace top flue gas out by booster fan through the flue gas of cooling, dust concentration 10mg/Nm after dedusting
3, be pressed into aiutage by main air blower and enter atmosphere, simultaneously, through the organic working medium liquid of condensation, through the driving of low-pressure stage working medium force (forcing) pump, first in the low-pressure stage evaporimeter being installed in current-sharing regenerator, absorb the heat of fume afterheat carrier, become low-pressure stage working substance steam, one tunnel enters the low pressure filling mouth with the organic turbine of filling mouth through pipeline, another road is after the pressurization of medium pressure grade working medium force (forcing) pump, enter the heat that absorbs fume afterheat carrier in medium pressure grade evaporimeter, become medium pressure grade working substance steam, one tunnel enters the middle pressure filling mouth with the organic turbine of filling mouth through pipeline, another road is after the pressurization of hiigh pressure stage working medium force (forcing) pump, enter the heat that absorbs fume afterheat carrier in hiigh pressure stage evaporimeter, become hiigh pressure stage working substance steam, enter the high-pressure admission cylinder with the organic turbine of filling mouth through pipeline, the working substance steam acting of expanding in multistage organic turbine, and drive threephase generator to generate electricity, the electric energy that system is sent is three-phase alternating current, rated voltage is 380V, can after pressure regulation, be incorporated to electrical network in factory, or directly give consumer use, be condensed into saturated liquid from the working substance steam of discharging with the organic turbine of filling mouth by shell-and-tube cooler, enter fluid reservoir, fluid reservoir can be guaranteed low-pressure stage working medium force (forcing) pump continuous pressure, to after worker quality liquid pressurization, be sent in low-pressure stage evaporimeter by low-pressure stage working medium force (forcing) pump again, start new round circulation, from shell-and-tube cooler recirculated water out, cooling 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: adopting R600a is circulation organic working medium.
The invention has the beneficial effects as follows: because thermal storage temperature equalizer can be to flue-gas temperature peak load shifting, reduce flue gas maximum temperature, reduce the fluctuating range of flue-gas temperature, alleviate the rapid drawdown that rises sharply of flue-gas temperature, thereby can reduce the investment of device for generating power by waste heat, improve the stability of device for generating power by waste heat, and can configure safely all kinds of waste heat power generation equipments.
The present invention is high in organic working medium, in, in low evaporimeter, adopt the measure of multistage evaporation, utilize the low-temperature zone heating of semi-hermetic electric furnace flue gas waste heat to produce low-pressure steam, the low pressure filling mouth that enters organic turbine expands and does work, utilize the middle-temperature section heating of semi-hermetic electric furnace flue gas waste heat to produce middle pressure steam, the middle pressure filling mouth that enters organic turbine expands and does work, utilize the high temperature section heating of semi-hermetic electric furnace flue gas waste heat to produce high steam, enter the high pressure cylinder expansion acting of organic turbine, realize the step dividing potential drop heating of semi-hermetic electric furnace flue gas waste heat to organic working medium, so just in heating surfaces at different levels, reduce the lack of uniformity of the heat transfer temperature difference between residual heat stream and working medium, having reduced the entropy bringing due to different transfer of heat irreversible loss increases, the comparable single-stage evaporation organic Rankine circulation 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 sack cleaner can be selected cheapest terylene needled felt cloth bag, investment and operating cost are reduced, concentration of emission is low, can guarantee to discharge dust concentration at 10mg/Nm
3.
Compared with the prior art the present invention has the following advantages:
1. thermal storage temperature equalizer can be to flue-gas temperature peak load shifting, reduce flue gas maximum temperature, reduce the fluctuating range of flue-gas temperature, alleviate the rapid drawdown that rises sharply of flue-gas temperature, solve the problem of expanding with heat and contract with cold;
2. adopt multistage evaporation organic Rankine circulation cogeneration to reclaim the waste heat of electric furnace flue gas, the comparable single-stage evaporation organic Rankine circulation of its thermal efficiency improves 30～35%;
3. cooling 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.
Brief description of the drawings
Fig. 1 realizes process chart of the present invention.
In Fig. 1: 1. semi-hermetic 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. dedusters, 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: semi-hermetic electric furnace flue gas method for power generation by waste heat step of the present invention is as follows:
70t/h steel-making semi-hermetic electric furnace 1 interior smoke discharging flow 20 × 10
4nm
3/ h, 1000 DEG C of temperature, dust content 25g/Nm
3discharged by the 4th hole, sneak into cold wind through water-cooled sliding sleeve 2, after burning CO 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 suitably sneak 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 arrangements are between composite carbon-copper material heat storage 7, by composite carbon-copper material heat storage 7 in thermal storage temperature equalizer 5 to the heat-accumulating and temperature-equalizing effect of high-temperature flue gas after, flue gas enters in current-sharing regenerator 11, high-temperature flue gas is emitted heat, temperature is down to 80 DEG C, flue gas through cooling is out mixed and enters in the lump deduster 16 with the outer discharge pipe 4 that is connected to semi-hermetic electric furnace 1 top flue gas out by booster fan 15, dust concentration 10mg/Nm after dedusting
3, be pressed into aiutage 18 by main air blower 17 and enter atmosphere, simultaneously, through the organic working medium liquid of condensation, through the driving of low-pressure stage working medium force (forcing) pump 19, first in the low-pressure stage evaporimeter 14 being installed in current-sharing regenerator 11, absorb the heat of fume afterheat carrier, become low-pressure stage working substance steam, one tunnel enters the low pressure filling mouth with the organic turbine 23 of filling mouth through pipeline, another road is after 20 pressurizations of medium pressure grade working medium force (forcing) pump, enter the heat that absorbs fume afterheat carrier in medium pressure grade evaporimeter 13, become medium pressure grade working substance steam, one tunnel enters the middle pressure filling mouth with the organic turbine 23 of filling mouth through pipeline, another road is after 21 pressurizations of hiigh pressure stage working medium force (forcing) pump, enter the heat that absorbs fume afterheat carrier in hiigh pressure stage evaporimeter 12, become hiigh pressure stage working substance steam, enter the high-pressure admission cylinder with the organic turbine 23 of filling mouth through pipeline, working substance steam is in the interior expansion acting of multistage organic turbine 23, and drive threephase generator 24 to generate electricity, the electric energy that system is sent is three-phase alternating current, rated voltage is 380V, can after pressure regulation, be incorporated to electrical network in factory, or directly give consumer use, be condensed into saturated liquid from the working substance steam of discharging with the organic turbine 23 of filling mouth by shell-and-tube cooler 26, enter fluid reservoir 22, fluid reservoir 22 can be guaranteed low-pressure stage working medium force (forcing) pump 19 continuous pressures, to after worker quality liquid pressurization, be sent in low-pressure stage evaporimeter 14 by low-pressure stage working medium force (forcing) pump 19 again, start new round circulation, from shell-and-tube cooler 26 recirculated water out, cooling 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 expanding after acting 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 that adopts organic working medium multistage evaporation in high, medium and low evaporimeter, reclaim the waste heat of semi-hermetic electric furnace flue gas, cooling from shell-and-tube cooler recirculated cooling water out 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.
Taking 70t/h steel-making semi-hermetic electric furnace waste heat recovery and dust collecting process as example, the inventive method and conventional method comparison, be 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 to greatest extent heat energy in recovered flue gas is converted into high-grade electric energy, and its thermal efficiency ratio single-stage evaporation organic Rankine circulation improves 30～35%, the environment protecting that can also reach.
Claims (2)
1. semi-hermetic electric furnace flue gas method for power generation by waste heat, it is characterized in that: in semi-hermetic electric furnace of the present invention, smoke discharging is discharged by the 4th hole, sneak into cold wind through water-cooled sliding sleeve, after burning CO gas, enter combustion settling chamber, 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, 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 the heat-accumulating and temperature-equalizing effect of high-temperature flue gas after, flue gas enters in current-sharing regenerator, high-temperature flue gas is emitted heat, temperature is down to 80 DEG C, out mix and enter in the lump deduster with the outer discharge pipe that is connected to semi-hermetic electric furnace top flue gas out by booster fan through the flue gas of cooling, dust concentration 10mg/Nm after dedusting
3, be pressed into aiutage by main air blower and enter atmosphere, simultaneously, through the organic working medium liquid of condensation, through the driving of low-pressure stage working medium force (forcing) pump, first in the low-pressure stage evaporimeter being installed in current-sharing regenerator, absorb the heat of fume afterheat carrier, become low-pressure stage working substance steam, one tunnel enters the low pressure filling mouth with the organic turbine of filling mouth through pipeline, another road is after the pressurization of medium pressure grade working medium force (forcing) pump, enter the heat that absorbs fume afterheat carrier in medium pressure grade evaporimeter, become medium pressure grade working substance steam, one tunnel enters the middle pressure filling mouth with the organic turbine of filling mouth through pipeline, another road is after the pressurization of hiigh pressure stage working medium force (forcing) pump, enter the heat that absorbs fume afterheat carrier in hiigh pressure stage evaporimeter, become hiigh pressure stage working substance steam, enter the high-pressure admission cylinder with the organic turbine of filling mouth through pipeline, the working substance steam acting of expanding in multistage organic turbine, and drive threephase generator to generate electricity, the electric energy that system is sent is three-phase alternating current, rated voltage is 380V, can after pressure regulation, be incorporated to electrical network in factory, or directly give consumer use, be condensed into saturated liquid from the working substance steam of discharging with the organic turbine of filling mouth by shell-and-tube cooler, enter fluid reservoir, fluid reservoir can be guaranteed low-pressure stage working medium force (forcing) pump continuous pressure, to after worker quality liquid pressurization, be sent in low-pressure stage evaporimeter by low-pressure stage working medium force (forcing) pump again, start new round circulation, from shell-and-tube cooler recirculated water out, cooling 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. semi-hermetic electric furnace flue gas method for power generation by waste heat according to claim 1, is characterized in that: adopting R600a is circulation organic working medium.
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN112611010A (en) * | 2020-11-30 | 2021-04-06 | 华北电力大学 | Flexible adjusting system and method for power generation load of multi-heat-source cogeneration unit |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN112611010A (en) * | 2020-11-30 | 2021-04-06 | 华北电力大学 | Flexible adjusting system and method for power generation load of multi-heat-source cogeneration unit |
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Application publication date: 20141001 |