CN103017552A - Organic Rankine cycle waste heat power generation and dust removal method of flue gas of metallurgical furnace - Google Patents
Organic Rankine cycle waste heat power generation and dust removal method of flue gas of metallurgical furnace Download PDFInfo
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- CN103017552A CN103017552A CN2011102895243A CN201110289524A CN103017552A CN 103017552 A CN103017552 A CN 103017552A CN 2011102895243 A CN2011102895243 A CN 2011102895243A CN 201110289524 A CN201110289524 A CN 201110289524A CN 103017552 A CN103017552 A CN 103017552A
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Abstract
The invention discloses an organic Rankine cycle waste heat power generation and dust removal method of flue gas of a metallurgical furnace. The method is characterized by comprising the following steps of: discharging internal exhaust flue gas of the metallurgical furnace, mixing with cold air through a water-cooled sliding sleeve and then feeding into a combustion settling chamber; feeding the flue gas which passes through the combustion settling chamber into a waste heat exchange chamber; discharging heat by the high-temperature flue gas; then directly feeding into a dust remover; and pressing into an exhaust cylinder by a main fan after dust removal to be discharged into atmosphere. Meanwhile, circulating water enters a heat tube heat exchanger in the waste heat exchange chamber through a water supply pump to absorb heat of the flue gas, and formed steam-water mixture enters an evaporator to discharge heat. The heat of the steam-water mixture is absorbed by a low-boiling-point organic working substance in the evaporator through a working substance pump to turn the steam-water mixture into saturated steam; and working substance steam expands in a low-boiling-point working substance steam turbine to do work so as to drive a three-phase generator to generate power. The method is further characterized in that R245fa is used as a cycle organic working substance. According to the method, the heat energy in the flue gas can be recovered to the greatest extent to be converted into high-grade electric energy, the dust removal capacity can also be improved, and a good environmental protection effect can be achieved.
Description
Technical field
The present invention relates to a kind of metallurgical furnace flue gas organic Rankine circulation cogeneration and dust collection method, 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 metallurgical furnace dedusting technical field.
Background technology
The purifier of metallurgical furnace flue gas is that metallurgical 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 accumulating type waste-heat boiler reclaim the waste heat of metallurgical furnace flue gas, produce saturated vapor etc.Because the big ups and downs of metallurgical furnace flue gas temperature, dustiness is large, and light water tubulation waste heat boiler is difficult to apply to the waste heat recovery of metallurgical furnace flue gas.At present, heat accumulating type waste-heat boiler has successfully applied in the electric furnace flue gas waste heat recovery, but because the inherent shortcoming of heat exchanger tube (cost is high, not freeze proof, non-refractory, service life short), so that heat accumulating type waste-heat boiler is in a lot of problems that also face of popularizing of steel industry.
Simultaneously, because the metallurgical 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 the circulation cogeneration of metallurgical furnace flue gas organic Rankine and dust collection method, by the method cooling high temperature flue gas efficiently, 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 10mg/Nm of discharging
3, and do not affect the stable and continuous of metallurgical furnace production.
The technical solution adopted in the present invention is as follows:
The circulation cogeneration of metallurgical furnace flue gas organic Rankine and dust collection method is characterized in that: smoke discharging is discharged by the 4th hole in the metallurgical furnace of the present invention, sneaks into cold wind through the water-cooled sliding sleeve, enters combustion settling chamber behind the burning CO gas; CO gas in the flue gas is fully burnt, 850 ℃ of the flue-gas temperatures of adjusting control expansion chamber; Flue gas through combustion settling chamber enters the waste heat Heat Room, and high-temperature flue gas is emitted heat, finishes heat exchange, discharges when temperature is down to 100 ℃, and waste heat Heat Room flue gas out directly enters deduster, is pressed into aiutage by main air blower and enters atmosphere after dedusting.Simultaneously, recirculated water drives by the heat exchanger feed pump, enter the heat that absorbs flue gas in the heat exchange of heat pipe that is installed in the waste heat Heat Room, form steam water interface, steam water interface is tried hard to recommend in Natural Circulation and is entered in the shell-and-tube evaporator under moving, emits heat, becomes water at low temperature, water at low temperature flows into circulating water pool, the circulation of a beginning new round.The low boiling organic working medium drives by working medium pump, absorbs the heat of steam water interface in shell-and-tube evaporator, 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 condenser condenses, sends in the shell-and-tube evaporator 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 to absorb heat in the shell-and-tube cooler, 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 R245fa.
Among the present invention, the device combinations such as organic Rankine circulation device for generating power by waste heat place of water tubulation waste heat boiler, heat accumulating type waste-heat boiler, both simplified system configuration, heat energy in the recovered flue gas is converted into the high-grade electric energy to greatest extent again, can reduce simultaneously the exhaust temperature of flue gas, improve dust collection capacity, obtain good dust removing effects, the dust concentration 10mg/Nm of discharging
3, reach the purpose that energy-conserving and environment-protective are produced.
Compared with the prior art the present invention has the following advantages: the present invention is by device combinations such as organic Rankine circulation device for generating power by waste heat place of water tubulation waste heat boiler, heat accumulating type 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; Sensible heat is fully utilized, and has reduced the exhaust temperature of flue gas, 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 10mg/Nm
3, reach the purpose that energy-conserving and environment-protective are produced.
Description of drawings
Fig. 1 is the process chart of realizing metallurgical furnace flue gas organic Rankine circulation cogeneration of the present invention and dust collection method.
1. metallurgical furnaces among the figure, 2. water-cooled sliding sleeve, 3. combustion settling chamber, 4. waste heat Heat Room, 5. deduster, 6. blower fan, 7. aiutage, 8. heat exchange of heat pipe, 9. heat exchanger feed pump, 10. circulating water pool, 11. shell-and-tube evaporators, 12. low boiling working fluid steam turbines, 13. threephase generator, 14. working medium circulating pumps, 15. water circulating pumps, 16. shell-and-tube cooler, 17. cooling towers.
The specific embodiment
The invention will be further described below in conjunction with accompanying drawing:
As shown in Figure 1: metallurgical furnace flue gas organic Rankine circulation cogeneration of the present invention and dust collection method step are as follows: 100t/h metallurgical furnace 1 interior smoke discharging flow 25 * 10
4Nm
3/ h, 1250 ℃ of temperature, dust content 35g/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, 850 ℃ of the flue-gas temperatures of adjusting control expansion chamber; Flue gas through combustion settling chamber 3 enters waste heat Heat Room 4, and high-temperature flue gas is emitted heat, finishes heat exchange, when being down to 100 ℃, temperature discharges, waste heat Heat Room 4 flue gas out directly enters deduster 5, and dust concentration 10mg/Nm3 after dedusting is pressed into aiutage 7 by main air blower 6 and enters atmosphere.Simultaneously, recirculated water drives by heat exchanger feed pump 9, enter the heat that absorbs flue gas in the heat exchange of heat pipe 8 that is installed in the waste heat Heat Room 4, form steam water interface, steam water interface is tried hard to recommend in Natural Circulation and is entered in the shell-and-tube evaporator 11 under moving, emits heat, becomes water at low temperature, water at low temperature flows into circulating water pool 10, the circulation of a beginning new round.
The low boiling organic working medium drives by working medium pump 14, absorbs the heat of steam water interface in shell-and-tube evaporator 11, becomes saturated vapor, and behind pressure regulator valve, working substance steam is in the 12 interior expansion actings of low boiling working fluid steam turbine, and 13 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 12 is condensed into saturated liquid by condenser 16, sends in the shell-and-tube evaporator 11 circulation of a beginning new round after by working medium pump 14 worker quality liquid being pressurizeed again.The recirculated water of coming from cooling tower 17 drives by water circulating pump 15, enters in the shell-and-tube cooler 16 to absorb heat, tries hard to recommend moving lower entering in the cooling tower 17 in Natural Circulation, emits heat, becomes water at low temperature, and a beginning new round circulates.
The low boiling organic working medium is R245fa, and the power pressure that enters the low boiling working fluid steam turbine is 2.15MPa, and the power pressure after the acting of expanding is 0.35MPa, and system's electromotive power output is 2500KW, and Rankine cycle efficient is 15.9%.
Maximum characteristics of the present invention are to adopt low boiling working fluid organic Rankine circulation method for power generation by waste heat to reclaim the waste heat of metallurgical furnace flue gas.Take 100t/h steel-making metallurgical furnace waste heat recovery and dust collecting process as example, the inventive method and conventional method comparison are described as follows:
Annotate: work per year and calculated in 330th.
This shows, the inventive method smoke dust discharge concentration is low, and plant investment is low, operation energy consumption is low, good purification.
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 environment protecting.
Claims (2)
1. metallurgical furnace flue gas organic Rankine circulation cogeneration and dust collection method is characterized in that: smoke discharging is discharged by the 4th hole in the metallurgical furnace, sneaks into cold wind through the water-cooled sliding sleeve, enters combustion settling chamber behind the CO gas that burns; CO gas in the flue gas is fully burnt, 850 ℃ of the flue-gas temperatures of adjusting control expansion chamber; Flue gas through combustion settling chamber enters the waste heat Heat Room, and high-temperature flue gas is emitted heat, finishes heat exchange, discharges when temperature is down to 100 ℃, and waste heat Heat Room flue gas out directly enters deduster, is pressed into aiutage by main air blower and enters atmosphere after dedusting.Simultaneously, recirculated water drives by the heat exchanger feed pump, enter the heat that absorbs flue gas in the heat exchange of heat pipe that is installed in the waste heat Heat Room, form steam water interface, steam water interface is tried hard to recommend in Natural Circulation and is entered in the shell-and-tube evaporator under moving, emits heat, becomes water at low temperature, water at low temperature flows into circulating water pool, the circulation of a beginning new round.The low boiling organic working medium drives by working medium pump, absorbs the heat of steam water interface in shell-and-tube evaporator, 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 condenser condenses, sends in the shell-and-tube evaporator 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 to absorb heat in the shell-and-tube cooler, 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. metallurgical furnace flue gas organic Rankine circulation cogeneration according to claim 1 and dust collection method is characterized in that: adopting R245fa is the circulation organic working medium.
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104061793A (en) * | 2014-04-30 | 2014-09-24 | 上海宝钢节能环保技术有限公司 | Step-by-step waste heat recovery system and method for electric furnace flue gas on whole temperature section |
| CN110037543A (en) * | 2019-05-16 | 2019-07-23 | 山东省博兴县至美厨具进出口有限公司 | A kind of fuel gas steamer steam generator |
| CN114320511A (en) * | 2021-11-26 | 2022-04-12 | 河北光兴半导体技术有限公司 | Waste heat power generation system |
-
2011
- 2011-09-22 CN CN2011102895243A patent/CN103017552A/en active Pending
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104061793A (en) * | 2014-04-30 | 2014-09-24 | 上海宝钢节能环保技术有限公司 | Step-by-step waste heat recovery system and method for electric furnace flue gas on whole temperature section |
| CN104061793B (en) * | 2014-04-30 | 2016-06-15 | 上海宝钢节能环保技术有限公司 | A kind of electric furnace flue gas temperature section waste heat recovery system step by step and method entirely |
| CN110037543A (en) * | 2019-05-16 | 2019-07-23 | 山东省博兴县至美厨具进出口有限公司 | A kind of fuel gas steamer steam generator |
| CN114320511A (en) * | 2021-11-26 | 2022-04-12 | 河北光兴半导体技术有限公司 | Waste heat power generation system |
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Application publication date: 20130403 |