CN103017548A - Waste heat power generation energy-saving dust removal method of internal and external exhaust flue gas of metallurgical furnace - Google Patents
Waste heat power generation energy-saving dust removal method of internal and external exhaust flue gas of metallurgical furnace Download PDFInfo
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- CN103017548A CN103017548A CN2011102895154A CN201110289515A CN103017548A CN 103017548 A CN103017548 A CN 103017548A CN 2011102895154 A CN2011102895154 A CN 2011102895154A CN 201110289515 A CN201110289515 A CN 201110289515A CN 103017548 A CN103017548 A CN 103017548A
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Abstract
The invention discloses a waste heat power generation energy-saving dust removal method of internal and external exhaust 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 through a fourth hole, 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 heat storage and temperature equalizing chamber; discharging heat by the flue gas; feeding the flue gas into a booster fan to be connected with a dust remover together with an external exhaust passage connected above the metallurgical furnace; and pressing into an exhaust cylinder by a main fan after dust removal to be discharged into atmosphere. Meanwhile, an organic working substance is driven through a working substance pump; heat is absorbed in a primary surface evaporator to be changed into steam; and working substance steam expands in a steam turbine to do work so as to drive a generator to generate power. The method is characterized in that R142B is used as a cycle organic working substance, wherein the booster fan is connected with the dust remover together with the external exhaust passage connected above the metallurgical furnace. 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; and the method has the advantages of low device investment, low operation energy consumption and good environmental protection effect.
Description
Technical field
The present invention relates to the inside and outside capable of generating power by waste heat of exhaust fume energy-saving dedusting method of metallurgical 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 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 storage type heat-pipe heat exchanger 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 storage type heat-pipe heat exchanger has successfully applied in the metallurgical 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 heat storage type heat-pipe heat exchanger also faces a lot of problems at steel industry universal.
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 inside and outside capable of generating power by waste heat of exhaust fume energy-saving dedusting method of metallurgical 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 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 inside and outside capable of generating power by waste heat of exhaust fume energy-saving dedusting method of metallurgical furnace, smoke discharging is discharged by the 4th hole in the metallurgical 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, 750 ℃ of the flue-gas temperatures of adjusting control expansion chamber, flue gas through combustion settling chamber enters the heat-accumulating and temperature-equalizing chamber, high-temperature flue gas is emitted heat, finish heat exchange, temperature is down to 100 ℃, and the outer discharge pipe above then flue gas enters booster fan and is connected to metallurgical furnace is connected deduster, dust concentration 10mg/Nm after dedusting in the lump
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 the one-time surface evaporimeter, 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 condensed into saturated liquid by the alumal Fin-tube Condenser, sends in the one-time surface evaporimeter 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 alumal Fin-tube 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 R142B.
Further be characterised in that: booster fan of the present invention is connected deduster in the lump with the outer discharge pipe that is connected to the metallurgical furnace top, is pressed into aiutage by main air blower again and enters atmosphere.
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 storage type heat-pipe heat exchangers, 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 at 10mg/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 the inside and outside capable of generating power by waste heat of exhaust fume energy-saving dedusting method of metallurgical furnace of the present invention.
1. electric furnaces among the figure, 2. water-cooled sliding sleeve, 3. combustion settling chamber, 4. heat-accumulating and temperature-equalizing chamber, 5. outer discharge pipe, 6. booster fan, 7. deduster, 8. main air blower, 9. aiutage, 10. one-time surface evaporimeter, 11. low boiling working fluid steam turbines, 12. threephase generators, 13. working medium circulating pump, 14. water pump, 15. alumal Fin-tube Condenser, 16. cooling towers.
The specific embodiment
The invention will be further described below in conjunction with accompanying drawing:
As shown in Figure 1: 90t/h metallurgical furnace 1 interior smoke discharging flow 22 * 10 of the present invention
4Nm
3/ h, 1000 ℃ of temperature, dust content 42g/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, 750 ℃ of the flue-gas temperatures of adjusting control expansion chamber enter heat-accumulating and temperature-equalizing chamber 4 by combustion settling chamber 3 flue gas out, and temperature is down to about 100 ℃, entering booster fan 6 through the flue gas of cooling mixes with outer discharge pipe 5 flue gas out that is connected to metallurgical furnace 1 top and enters in the lump deduster 7, dust concentration 10mg/Nm after dedusting
3Be pressed into aiutage 9 by main air blower 8 and enter atmosphere.Simultaneously, low boiling working fluid drives by working medium pump 13, in being installed on the indoor one-time surface evaporimeter 10 of heat-accumulating and temperature-equalizing, absorb first the heat of fume afterheat carrier, become saturated vapor, behind pressure regulator valve, working substance steam is in the 11 interior expansion actings of low boiling working fluid steam turbine, and 12 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 11 is condensed into saturated liquid by alumal Fin-tube Condenser 15, sends in the one-time surface evaporimeter 10 circulation of a beginning new round after by working medium pump 13 worker quality liquid being pressurizeed again.The recirculated water of coming from cooling tower 16 drives by water circulating pump 14, enters absorbing heat in the alumal Fin-tube Condenser 15, tries hard to recommend moving lower entering in the cooling tower 16 in Natural Circulation, emits heat, becomes water at low temperature, and a beginning new round circulates.
Described low boiling working fluid is R142B, the power pressure that enters the low boiling working fluid steam turbine is 2.65MPa, and when the power pressure after the acting of expanding was 0.32MPa, system's electromotive power output was 2500KW, Rankine cycle efficient is 22.5%, and the flue-gas temperature that system discharges is 100 ℃.
Maximum characteristics of the present invention are to adopt low boiling working fluid organic Rankine circulation cogeneration to reclaim the waste heat of metallurgical furnace flue gas.Take the waste heat recovery of 90t/h metallurgical 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 10mg/Nm of discharging
3, plant investment is low, operation energy consumption is low, and environment protecting is good.
Claims (3)
1. the inside and outside capable of generating power by waste heat of exhaust fume energy-saving dedusting method of metallurgical furnace, it is characterized in that: smoke discharging is discharged by the 4th hole in the metallurgical 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, 750 ℃ of the flue-gas temperatures of adjusting control expansion chamber, flue gas through combustion settling chamber enters the heat-accumulating and temperature-equalizing chamber, high-temperature flue gas is emitted heat, finish heat exchange, temperature is down to 100 ℃, and the outer discharge pipe above then flue gas enters booster fan and is connected to metallurgical furnace is connected deduster, dust concentration 10mg/Nm after dedusting in the lump
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 the one-time surface evaporimeter, 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 condensed into saturated liquid by the alumal Fin-tube Condenser, sends in the one-time surface evaporimeter 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 alumal Fin-tube 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. the inside and outside capable of generating power by waste heat of exhaust fume energy-saving dedusting method of metallurgical furnace according to claim 1, it is characterized in that: adopting R142B is the circulation organic working medium.
3. the inside and outside capable of generating power by waste heat of exhaust fume energy-saving dedusting method of metallurgical furnace according to claim 1 is characterized in that: described booster fan is connected deduster in the lump with outer discharge pipe above being connected to metallurgical furnace, is pressed into aiutage by main air blower again and enters atmosphere.
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| CN2011102895154A CN103017548A (en) | 2011-09-22 | 2011-09-22 | Waste heat power generation energy-saving dust removal method of internal and external exhaust flue gas of metallurgical furnace |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104406416A (en) * | 2014-11-04 | 2015-03-11 | 无锡东雄重型电炉有限公司 | Flue gas purification and heat energy utilization system of AOD (Argon Oxygen Decarburization) refining furnace |
-
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- 2011-09-22 CN CN2011102895154A patent/CN103017548A/en active Pending
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104406416A (en) * | 2014-11-04 | 2015-03-11 | 无锡东雄重型电炉有限公司 | Flue gas purification and heat energy utilization system of AOD (Argon Oxygen Decarburization) refining furnace |
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Application publication date: 20130403 |