CN103836989A - Flue gas waste heat power-generation energy-conservation and dust-removal method for electric furnace with thermal storage temperature evening device - Google Patents
Flue gas waste heat power-generation energy-conservation and dust-removal method for electric furnace with thermal storage temperature evening device Download PDFInfo
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- CN103836989A CN103836989A CN201210516041.7A CN201210516041A CN103836989A CN 103836989 A CN103836989 A CN 103836989A CN 201210516041 A CN201210516041 A CN 201210516041A CN 103836989 A CN103836989 A CN 103836989A
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Abstract
Provided is a flue gas waste heat power-generation energy-conservation and dust-removal method for an electric furnace with a thermal storage temperature evening device. The method is characterized in that flue gas in the electric furnace is mixed into cold air through a water-cooled sliding sleeve, then enters a settling chamber, the thermal storage temperature evening device and a waste heat exchange chamber and emits heat, the flue gas enters a bag-type dust remover, the flue gas after dust removal is pressed into an exhaust funnel to be exhausted to atmosphere through a main fan, meanwhile, organic working media absorb heat in an evaporator through a working medium pump to become steam, the steam enters a steam drum, working medium steam does work in a steam turbine in an expansion mode and drives a generator to generate electricity, the working medium steam exhausted from a low boiling point working medium steam turbine is condensed to saturated liquid through a condenser to enter a liquid storage tank, the working medium pump pressurizes working medium liquid and then feeds the working medium liquid into the evaporator, and a new round of circulation is began; R141B is adopted to serve as the circulating organic working media. Waste heat of the flue gas of the electric furnace is recycled in the mode of low boiling point working medium organic Rankine cycle waste heat power generation, heat energy is converted into high-grade electric energy, investment of the device is little, and running energy consumption is low.
Description
Technical field
The present invention relates to a kind of electric furnace flue gas cogeneration energy-saving dedusting method with thermal storage temperature equalizer, 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 electric stove dust technical field.
Background technology
Steel and iron industry consumes mass energy every year, and the high-temperature flue gas producing in smelting process and equipment cooling have been taken away large energy.Because electric furnace steel making flue-gas temperature is very high, the temperature that enters pipeline after trapping is generally 1100 ℃ of left and right, and dust concentration reaches 18g/Nm
3, the ash that is less than 8um accounts for the more than 75% of dust total amount, and Dust Capacity is large, and sticky and thin.And flue-gas temperature big ups and downs, 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, heat-pipe heat exchanger has successfully applied in the flue gas waste heat recovery of electric furnace, but due to the inherent shortcoming of heat pipe (cost is high, not freeze proof, non-refractory, service life short), make heat pipe residual-heat recovery also face a lot of problems at steel industry universal.
Owing to containing a large amount of dust in flue gas, on heat exchange element, there is dust stratification, clogging in sticky and thin dust, not only affect heat exchange efficiency, cause waste heat boiler steam production deficiency, more seriously due to the stifled ash of waste heat boiler, system fluctuation of service, causes to smelt and produces and cannot normally carry out, the maintenance of being forced to stop production.
Meanwhile, because electric furnace flue gas temperature fluctuation is violent, wave amplitude is large, and waste-heat recovery device just must design enough greatly, guarantees that high-temperature flue gas also can effective cooling.But far below the evaporation capacity of waste-heat recovery device, there is the situation of low load with strong power in actual steam output.The economic worth that this has just reduced waste-heat recovery device relatively, has increased the investment of waste-heat recovery device.
Summary of the invention
For the problems referred to above, the invention provides a kind of electric furnace flue gas cogeneration energy-saving dedusting method with thermal storage temperature equalizer, can not only effectively reduce electric furnace flue gas temperature fluctuation amplitude by the method, also reduced the peak value of flue-gas temperature simultaneously, cooling high temperature flue gas efficiently, the heat energy in recovered flue gas is converted into high-grade electric energy to greatest extent, can reduce the exhaust temperature of flue gas simultaneously, improve dust collection capacity, obtain good dust removing effects, the dust concentration 16mg/Nm of discharge
3, and do not affect the stable and continuous of electric furnace production.
The technical solution adopted in the present invention is as follows:
With the electric furnace flue gas cogeneration energy-saving dedusting method of thermal storage temperature equalizer, it is characterized in that: in 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, 900 ℃ of the flue-gas temperatures of adjusting control expansion chamber, flue gas through combustion settling chamber enters thermal storage temperature equalizer, described thermal storage temperature equalizer comprises gas approach, aluminum matrix composite materials heat storage, sound wave ash cleaner, exhanst gas outlet and ash bucket, described aluminum matrix composite materials heat storage is arranged between gas approach and exhanst gas outlet, described carbon aluminium deashing device step-by-step arrangement is between heat storage, by aluminum matrix composite materials heat storage in thermal storage temperature equalizer to the heat-accumulating and temperature-equalizing effect of high-temperature flue gas after, flue gas enters residual heat exchanging chamber, high-temperature flue gas is emitted heat, complete heat exchange, temperature is down to 120 ℃ of left and right, then flue gas enters sack cleaner, dust concentration 16mg/Nm after dedusting
3, be pressed into aiutage by main air blower and enter atmosphere, simultaneously, low boiling organic working medium drives by working medium circulating pump, in one-time surface evaporimeter, absorb the heat of flue gas, become saturated vapor, enter drum, drum can filtering source of the gas in supersaturation moisture content and impurity, guarantee steam turbine even running, working substance steam is by after pressure regulator valve, in low boiling working fluid steam turbine, expand and do work, 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, the working substance steam of discharging from low boiling working fluid steam turbine is condensed into saturated liquid by shell-and-tube cooler, enter fluid reservoir, fluid reservoir can be guaranteed working medium circulating pump continuous pressure, working medium circulating pump will be sent in one-time surface evaporimeter after worker quality liquid pressurization, 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 ℃, meet working substance steam and be condensed into the requirement of saturated liquid to cooling water, send in shell-and-tube cooler through water pump, start new round circulation.
It is further characterized in that: it is circulation organic working medium that the present invention adopts R141B.
The invention has the beneficial effects as follows: because electric furnace flue gas temperature fluctuation is violent, flue-gas temperature peak value is high, after flue gas is processed by thermal storage temperature equalizer of the present invention, flue-gas temperature fluctuating range can greatly reduce, also reduced the peak value of flue-gas temperature simultaneously, can make waste-heat recovery device investment reduce, flue-gas temperature fluctuating range reduces, be conducive to improve the stability of waste-heat recovery device, increase the service life, flue gas through thermal storage temperature equalizer enters residual heat exchanging chamber, through the heat exchange of one-time surface evaporimeter, reclaim again the waste heat of low-temperature flue gas in electric furnace by low boiling working fluid organic Rankine circulation cogeneration, heat energy in recovered flue gas is converted into high-grade electric energy to greatest extent, drag dedusting fan, reduce system operation energy consumption, sensible heat is fully utilized, and has reduced the exhaust temperature of flue gas, and because the exhaust temperature of flue gas can maintain 120 ℃, the filtrate in 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 16mg/Nm
3, reach the object that energy-conserving and environment-protective are produced.
Compared with the prior art the present invention has the following advantages:
1. adopt low boiling working fluid organic Rankine circulation cogeneration to reclaim the waste heat of low-temperature flue gas in electric furnace, realize electric furnace flue gas UTILIZATION OF VESIDUAL HEAT IN;
2. cooling by lithium-bromide absorption-type refrigerating machine, the temperature of cooling water is down to 10～15 ℃, meets working substance steam and is condensed into the requirement of saturated liquid to cooling water;
3. 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;
4. the service life of extension device;
5. improve device for generating power by waste heat efficiency;
6. reduce device for generating power by waste heat investment;
7. can reduce and sneak into cold blast rate, save dedusting energy consumption.
Accompanying drawing explanation
Fig. 1 realizes the process chart of the present invention with the electric furnace flue gas cogeneration energy-saving dedusting method of thermal storage temperature equalizer.
In figure: 1. electric furnace, 2. water-cooled sliding sleeve, 3. combustion settling chamber, 4. thermal storage temperature equalizer, 5. gas approach, 6. aluminum matrix composite materials heat storage, 7. ash bucket, 8. sound wave ash cleaner, 9. exhanst gas outlet, 10. residual heat exchanging chamber, 11. one-time surface evaporimeters, 12. working medium circulating pumps, 13. drums, 14. fluid reservoirs, 15. low boiling working fluid steam turbines, 16. threephase generators, 17. water pumps, 18. shell-and-tube coolers, 19. lithium-bromide absorption-type refrigerating machines, 20. dedusters, 21. main air blowers, 22. aiutages.
The specific embodiment
Below in conjunction with accompanying drawing, the invention will be further described:
As shown in Figure 1: the present invention is as follows with the electric furnace flue gas cogeneration energy-saving dedusting method step of thermal storage temperature equalizer:
100t/h electric furnace 1 flue gas flow 28 × 10
4nm
3/ h, 1100 ℃ of temperature, dust content 18g/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, 900 ℃ of the flue-gas temperatures of adjusting control expansion chamber, enter thermal storage temperature equalizer 4 by combustion settling chamber 3 flue gas out, described thermal storage temperature equalizer 4 comprises gas approach 5, aluminum matrix composite materials heat storage 6, sound wave ash cleaner 8, exhanst gas outlet 9 and ash bucket 7, described aluminum matrix composite materials heat storage 6 is arranged between gas approach 5 and exhanst gas outlet 9, described sound wave ash cleaner 8 step-by-step arrangements are between aluminum matrix composite materials heat storage 6, by aluminum matrix composite materials heat storage 6 in thermal storage temperature equalizer 4 to the heat-accumulating and temperature-equalizing effect of high-temperature flue gas after, flue gas enters in residual heat exchanging chamber 10, high-temperature flue gas is emitted heat, complete heat exchange, temperature is down to 120 ℃, enter deduster 20, dust concentration 16mg/Nm after dedusting
3, be pressed into aiutage 22 by main air blower 20 and enter atmosphere, simultaneously, low boiling organic working medium drives by working medium pump 12, first in the one-time surface evaporimeter 11 being installed in residual heat exchanging chamber 10, absorb the heat of fume afterheat carrier, become saturated vapor, enter drum 13, drum 13 can filtering source of the gas in supersaturation moisture content and impurity, guarantee steam turbine 15 even runnings, working substance steam is by after pressure regulator valve, in the interior expansion acting of low boiling working fluid steam turbine 15, and drive threephase generator 16 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, the working substance steam of discharging from low boiling working fluid steam turbine 15 is condensed into saturated liquid by shell-and-tube cooler 18, enter fluid reservoir 14, fluid reservoir 14 can be guaranteed working medium circulating pump 12 continuous pressures, working medium circulating pump 12 will be sent in one-time surface evaporimeter 11 after worker quality liquid pressurization, start new round circulation, from shell-and-tube cooler 18 recirculated water out, cooling by lithium-bromide absorption-type refrigerating machine 19, the temperature of cooling water is down to 10～15 ℃, meet working substance steam and be condensed into the requirement of saturated liquid to cooling water, send in shell-and-tube cooler 18 through water pump 17, start new round circulation.
Described low boiling working fluid is R141B, the power pressure that enters low boiling working fluid steam turbine is 2.29MPa, and when the power pressure expanding after acting is 0.21MPa, system electromotive power output is 3500KW, Rankine cycle efficiency is 27.5%, and the flue-gas temperature that system is discharged is 120 ℃.
Maximum feature of the present invention is to adopt low boiling working fluid organic Rankine circulation cogeneration to reclaim the waste heat of 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 ℃, meet working substance steam and be condensed into the requirement of saturated liquid to cooling water, adopt drum can filtering source of the gas in supersaturation moisture content and impurity, guarantee steam turbine even running, the heat energy in recovered flue gas is converted into high-grade electric energy to greatest extent.
Take the waste heat recovery of 100t/h steel-smelting electric furnace 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 can not only effectively reduce electric furnace flue gas temperature fluctuation amplitude, has also reduced the peak value of flue-gas temperature simultaneously, enters residual heat exchanging chamber through the flue gas of thermal storage temperature equalizer, due to flue-gas temperature peak reduction, can make device for generating power by waste heat investment reduce; Flue-gas temperature fluctuating range reduces, and is conducive to improve the stability of device for generating power by waste heat, increases the service life; 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 recovered flue gas is converted into high-grade electric energy, the environment protecting that can also reach, the dust concentration 16mg/Nm of discharge
3, and do not affect the stable and continuous of electric furnace production.
Claims (2)
1. with the electric furnace flue gas cogeneration energy-saving dedusting method of thermal storage temperature equalizer, it is characterized in that: in 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, 900 ℃ of the flue-gas temperatures of adjusting control expansion chamber, flue gas through combustion settling chamber enters thermal storage temperature equalizer, described thermal storage temperature equalizer comprises gas approach, aluminum matrix composite materials heat storage, sound wave ash cleaner, exhanst gas outlet and ash bucket, described aluminum matrix composite materials heat storage is arranged between gas approach and exhanst gas outlet, described carbon aluminium deashing device step-by-step arrangement is between heat storage, by aluminum matrix composite materials heat storage in thermal storage temperature equalizer to the heat-accumulating and temperature-equalizing effect of high-temperature flue gas after, flue gas enters residual heat exchanging chamber, high-temperature flue gas is emitted heat, complete heat exchange, temperature is down to 120 ℃ of left and right, then flue gas enters sack cleaner, dust concentration 16mg/Nm after dedusting
3, be pressed into aiutage by main air blower and enter atmosphere, simultaneously, low boiling organic working medium drives by working medium circulating pump, in one-time surface evaporimeter, absorb the heat of flue gas, become saturated vapor, enter drum, drum can filtering source of the gas in supersaturation moisture content and impurity, guarantee steam turbine even running, working substance steam is by after pressure regulator valve, in low boiling working fluid steam turbine, expand and do work, 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, the working substance steam of discharging from low boiling working fluid steam turbine is condensed into saturated liquid by shell-and-tube cooler, enter fluid reservoir, fluid reservoir can be guaranteed working medium circulating pump continuous pressure, working medium circulating pump will be sent in one-time surface evaporimeter after worker quality liquid pressurization, 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 ℃, meet working substance steam and be condensed into the requirement of saturated liquid to cooling water, send in shell-and-tube cooler through water pump, start new round circulation.
2. the electric furnace flue gas cogeneration energy-saving dedusting method with thermal storage temperature equalizer according to claim 1, is characterized in that: adopting R141B is circulation organic working medium.
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| CN109945635A (en) * | 2019-02-23 | 2019-06-28 | 滁州市洪武报废汽车回收拆解利用有限公司 | A kind of oil-containing processing steel scrap control system |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN109945635A (en) * | 2019-02-23 | 2019-06-28 | 滁州市洪武报废汽车回收拆解利用有限公司 | A kind of oil-containing processing steel scrap control system |
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Application publication date: 20140604 |