CN103017547A - Power generation, energy saving and dedusting method by utilizing heat waste of exhaust gas in electric furnace through organic rankine cycle - Google Patents
Power generation, energy saving and dedusting method by utilizing heat waste of exhaust gas in electric furnace through organic rankine cycle Download PDFInfo
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- CN103017547A CN103017547A CN201110289514XA CN201110289514A CN103017547A CN 103017547 A CN103017547 A CN 103017547A CN 201110289514X A CN201110289514X A CN 201110289514XA CN 201110289514 A CN201110289514 A CN 201110289514A CN 103017547 A CN103017547 A CN 103017547A
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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
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Abstract
The invention discloses a power generation, energy saving and dedusting method by utilizing heat waste of exhaust gas in an electric furnace through organic rankine cycle, which is characterized in that the exhaust gas in the electric furnace is discharged from a fourth hole, and enters a combustion settling chamber after cold air interfuses the exhaust gas through a water-cooling sliding sleeve; the exhaust gas passing through the combustion settling chamber enters a uniform velocity waste heat exchanger; the exhaust gas discharges heat, enters a bag-type dust collector, and is pressed into an exhaust funnel to be discharged into atmosphere by a main fan after being dedusted; meanwhile, an organic working medium is driven by a working medium pump to absorb the heat in a straight pipe plate heat pipe exchanger to be changed into vapor; and the working medium vapor swells to do work in a steam turbine to drive a generator to generate electricity. The working medium vapor discharged from a low-boiling-point working medium steam turbine is condensed into saturation liquid by a condenser; and the working medium liquid is pressurized by the working medium pump, and is then fed into the straight pipe plate heat pipe exchanger, so as to start a new round of circulation. The power generation, energy saving and dedusting method by utilizing the heat waste of the exhaust gas in the electric furnace through the organic rankine cycle is characterized in that R600 is adopted as a circulating organic working medium. With the adoption of the power generation, energy saving and dedusting method by utilizing the heat waste of the exhaust gas in the electric furnace through the organic rankine cycle, the heat energy in the exhaust gas is recovered to a maximum limit to be transformed into high-grade electric energy. The device is low in investment, low in operation energy consumption and good in environment-protection effect.
Description
Technical field
The present invention relates to smoke discharging organic Rankine cogeneration energy-saving dedusting method in the electric furnace, specifically the heat energy in the recovered flue gas is converted into the high-grade electric energy to greatest extent, can improve dust collection capacity again, belongs to the electric stove dust technical field.
Background technology
The purifier of electric furnace flue gas is that electric furnace flue gas generation, UTILIZATION OF VESIDUAL HEAT IN facility, deduster connect successively by pipeline in the prior art.
Usually the UTILIZATION OF VESIDUAL HEAT IN facility that adopts at present: water row tube waste heat boiler, heat accumulation type heat pipe waste heat boiler reclaim the waste heat of electric furnace flue gas, produce saturated vapor etc.Because the big ups and downs of electric furnace flue gas temperature, dustiness is large, and light water tubulation waste heat boiler is difficult to apply to the waste heat recovery of electric furnace flue gas.At present, the heat accumulation type heat pipe waste heat boiler has successfully applied in the electric furnace flue gas waste heat recovery, but because the inherent shortcoming of heat pipe (cost is high, not freeze proof, non-refractory, service life short), so that the heat accumulation type heat pipe waste heat boiler also faces a lot of problems at steel industry universal.
Simultaneously, because the electric furnace flue gas temperature fluctuation is violent, wave amplitude is large, and residual heat system just must design enough greatly, guarantees that high-temperature flue gas also can effective cooling.But actual steam output the situation of low load with strong power occurs far below the evaporation capacity of residual heat system.The economic worth that this has just reduced residual heat system has relatively increased the investment of residual heat system.
Summary of the invention
For the problems referred to above, the invention provides smoke discharging organic Rankine cogeneration energy-saving dedusting method in the electric furnace, can not only effectively reduce electric furnace flue gas temperature fluctuation amplitude by the method, also reduced simultaneously the peak value of flue-gas temperature, cooling high temperature flue gas efficiently, the heat energy in the recovered flue gas is converted into the high-grade electric energy to greatest extent, can reduce simultaneously the exhaust temperature of flue gas, improve dust collection capacity, obtain good dust removing effects, the dust concentration 7mg/Nm of discharging
3, and do not affect the stable and continuous of electric furnace production.
The technical solution adopted in the present invention is as follows:
Smoke discharging organic Rankine cogeneration energy-saving dedusting method in the electric furnace, it is characterized in that: smoke discharging is discharged by the 4th hole in the electric furnace of the present invention, sneak into cold wind through the water-cooled sliding sleeve, enter combustion settling chamber behind the burning CO gas, CO gas in the flue gas is fully burnt, 800 ℃ of the flue-gas temperatures of adjusting control expansion chamber, flue gas through combustion settling chamber enters the uniform flow residual heat exchanging chamber, high-temperature flue gas is emitted heat, finish heat exchange, temperature is down to 100 ℃, and then flue gas enters sack cleaner, dust concentration 7mg/Nm after dedusting
3, be pressed into aiutage by main air blower and enter atmosphere.Simultaneously, the low boiling organic working medium drives by working medium circulating pump, absorbs the heat of flue gas in straight tube plate heat pipe heat exchanger, becomes saturated vapor, behind pressure regulator valve, and the working substance steam acting of in the low boiling working fluid steam turbine, expanding, and the drive threephase generator generates electricity.The electric energy that system sends is three-phase alternating current, and rated voltage is 380V, can incorporate electrical network in the factory into through after the pressure regulation, or directly gives consumer and use.The working substance steam of discharging from the low boiling working fluid steam turbine is saturated liquid by magnesium rib-pipe type condenser condenses, sends in the straight tube plate heat pipe heat exchanger circulation of a beginning new round after by working medium pump worker quality liquid being pressurizeed again.The recirculated water of coming from cooling tower drives by water circulating pump, enters absorbing heat in the magnesium rib-pipe type condenser, tries hard to recommend moving lower entering in the cooling tower in Natural Circulation, emits heat, becomes water at low temperature, and a beginning new round circulates.
It is further characterized in that: it is the circulation organic working medium that the present invention adopts R600.
The invention has the beneficial effects as follows: because device combinations such as device for generating power by waste heat place of water tubulation waste heat boiler, heat accumulation type heat pipe waste heat boilers, so plant area is economized, investment and operating cost are low; Heat energy in the recovered flue gas is converted into the high-grade electric energy to greatest extent, drags dedusting fan, has reduced system's operation energy consumption; Because the exhaust temperature of flue gas can maintain 100 ℃, the filtrate in the sack cleaner can be selected cheapest normal temperature cloth bag, has reduced investment and operating cost; Concentration of emission is low, can guarantee to discharge dust concentration 7mg/Nm
3, reach the purpose that energy-conserving and environment-protective are produced.
Compared with the prior art the present invention has the following advantages:
1, can alleviate the rapid drawdown that rises sharply of flue-gas temperature;
2, solve the problem of expanding with heat and contract with cold;
3, the service life of extension device;
4, improve device for generating power by waste heat efficient;
5, reduce the device for generating power by waste heat investment;
6, can reduce and sneak into cold blast rate, save the dedusting energy consumption.
Description of drawings
Fig. 1 is the process chart of realizing smoke discharging organic Rankine cogeneration energy-saving dedusting method in the electric furnace of the present invention.
1. electric furnaces among the figure, 2. water-cooled sliding sleeve, 3. combustion settling chamber, 4. uniform flow residual heat exchanging chamber, 5. deduster, 6. main air blower, 7. aiutage, 8. straight tube plate heat pipe heat exchanger, 9. low boiling working fluid steam turbine, 10. threephase generator, 11. working medium circulating pump, 12. water pump, 13. magnesium rib-pipe type condensers, 14. cooling towers.
The specific embodiment
The invention will be further described below in conjunction with accompanying drawing:
As shown in Figure 1: smoke discharging organic Rankine cogeneration energy-saving dedusting method step is as follows in the electric furnace of the present invention: 150t/h steel-smelting electric furnace 1 interior smoke discharging flow 35 * 10
4Nm
3/ h, 1150 ℃ of temperature, dust content 29g/Nm
3Discharged by the 4th hole, sneak into cold wind through water-cooled sliding sleeve 2, enter combustion settling chamber 3 behind the burning CO gas; The effect of combustion settling chamber 3 is: reduce flue gas flow rate, make the big dust particle sedimentation of carrying in the flue gas, and suitably sneak into cold wind, finally burn CO gas, 800 ℃ of the flue-gas temperatures of adjusting control expansion chamber, enter uniform flow residual heat exchanging chamber 4 by combustion settling chamber 3 flue gas out, high-temperature flue gas is emitted heat, finishes heat exchange, and temperature is down to 100 ℃, enter deduster 5, dust concentration 7mg/Nm after dedusting
3Be pressed into aiutage 7 by main air blower 6 and enter atmosphere.Simultaneously, low boiling working fluid drives by working medium pump 11, absorb first the heat of fume afterheat carrier in the straight tube plate heat pipe heat exchanger 8 in being installed on uniform flow residual heat exchanging chamber 4, become saturated vapor, behind pressure regulator valve, working substance steam is in the 9 interior expansion actings of low boiling working fluid steam turbine, and 10 generatings of drive threephase generator.The electric energy that system sends is three-phase alternating current, and rated voltage is 380V, can incorporate electrical network in the factory into through after the pressure regulation, or directly gives consumer and use.The working substance steam of discharging from low boiling working fluid steam turbine 9 is condensed into saturated liquid by magnesium rib-pipe type condenser 13, sends in the straight tube plate heat pipe heat exchanger 8 circulation of a beginning new round after by working medium pump 11 worker quality liquid being pressurizeed again.The recirculated water of coming from cooling tower 14 drives by water circulating pump 12, enters absorbing heat in the magnesium rib-pipe type condenser 13, tries hard to recommend moving lower entering in the cooling tower 14 in Natural Circulation, emits heat, becomes water at low temperature, and a beginning new round circulates.
Described low boiling working fluid is R600, the power pressure that enters the low boiling working fluid steam turbine is 2.72MPa, and when the power pressure after the acting of expanding was 0.34MPa, system's electromotive power output was 3000KW, Rankine cycle efficient is 25.2%, and the flue-gas temperature that system discharges is 100 ℃.
Take the waste heat recovery of 150t/h steel-smelting electric furnace and dust collecting process as example, the inventive method and conventional method relatively are described as follows:
Annotate: work per year and calculated in 330th.
This shows that the present invention to greatest extent heat energy in the recovered flue gas is converted into the high-grade electric energy, can also reach good dust removing effects, the dust concentration 7mg/Nm of discharging
3, plant investment is low, operation energy consumption is low, and environment protecting is good.
Claims (2)
1. smoke discharging organic Rankine cogeneration energy-saving dedusting method in the electric furnace, it is characterized in that: smoke discharging is discharged by the 4th hole in the electric furnace of the present invention, sneak into cold wind through the water-cooled sliding sleeve, enter combustion settling chamber behind the burning CO gas, CO gas in the flue gas is fully burnt, 800 ℃ of the flue-gas temperatures of adjusting control expansion chamber, flue gas through combustion settling chamber enters the uniform flow residual heat exchanging chamber, high-temperature flue gas is emitted heat, finish heat exchange, temperature is down to 100 ℃, and then flue gas enters sack cleaner, dust concentration 7mg/Nm after dedusting
3, be pressed into aiutage by main air blower and enter atmosphere.Simultaneously, the low boiling organic working medium drives by working medium circulating pump, absorbs the heat of flue gas in straight tube plate heat pipe heat exchanger, becomes saturated vapor, behind pressure regulator valve, and the working substance steam acting of in the low boiling working fluid steam turbine, expanding, and the drive threephase generator generates electricity.The electric energy that system sends is three-phase alternating current, and rated voltage is 380V, can incorporate electrical network in the factory into through after the pressure regulation, or directly gives consumer and use.The working substance steam of discharging from the low boiling working fluid steam turbine is saturated liquid by magnesium rib-pipe type condenser condenses, sends in the straight tube plate heat pipe heat exchanger circulation of a beginning new round after by working medium pump worker quality liquid being pressurizeed again.The recirculated water of coming from cooling tower drives by water circulating pump, enters absorbing heat in the magnesium rib-pipe type condenser, tries hard to recommend moving lower entering in the cooling tower in Natural Circulation, emits heat, becomes water at low temperature, and a beginning new round circulates.
2. smoke discharging organic Rankine cogeneration energy-saving dedusting method in the electric furnace according to claim 1, it is characterized in that: adopting R600 is the circulation organic working medium.
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104101219A (en) * | 2013-04-12 | 2014-10-15 | 无锡市西漳环保设备有限公司 | Micro-filtration method for treating PM2.5 (Particulate Matter 2.5) micro-dust of electric furnace |
| CN104912634A (en) * | 2015-05-06 | 2015-09-16 | 东南大学 | Flue gas dust removal and waste heat utilization system for electricity generation cabin in South Pole |
| CN109827167A (en) * | 2019-01-30 | 2019-05-31 | 曾蒙汉 | A kind of string type direct combustion cascaded power generating system and method |
| CN113175362A (en) * | 2021-04-25 | 2021-07-27 | 西安热工研究院有限公司 | Bus pipe connection system for realizing zero output of low-pressure cylinder and operation method |
-
2011
- 2011-09-22 CN CN201110289514XA patent/CN103017547A/en active Pending
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104101219A (en) * | 2013-04-12 | 2014-10-15 | 无锡市西漳环保设备有限公司 | Micro-filtration method for treating PM2.5 (Particulate Matter 2.5) micro-dust of electric furnace |
| CN104912634A (en) * | 2015-05-06 | 2015-09-16 | 东南大学 | Flue gas dust removal and waste heat utilization system for electricity generation cabin in South Pole |
| CN109827167A (en) * | 2019-01-30 | 2019-05-31 | 曾蒙汉 | A kind of string type direct combustion cascaded power generating system and method |
| CN113175362A (en) * | 2021-04-25 | 2021-07-27 | 西安热工研究院有限公司 | Bus pipe connection system for realizing zero output of low-pressure cylinder and operation method |
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Application publication date: 20130403 |