CN104344734A - Organic Rankine waste heat power generation method for flue gas from ferroalloy furnace - Google Patents
Organic Rankine waste heat power generation method for flue gas from ferroalloy furnace Download PDFInfo
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- CN104344734A CN104344734A CN201310356277.3A CN201310356277A CN104344734A CN 104344734 A CN104344734 A CN 104344734A CN 201310356277 A CN201310356277 A CN 201310356277A CN 104344734 A CN104344734 A CN 104344734A
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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
- Y02P10/00—Technologies related to metal processing
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Abstract
The invention discloses an organic Rankine waste heat power generation method for flue gas from a ferroalloy furnace. The organic Rankine waste heat power generation method is characterized in that the flue gas from the ferroalloy furnace is exhausted from the inside of a furnace and is mixed with cold air through a water-cooled flue; after carbon gas is burnt and oxidized, the obtained gas enters a settling chamber and then enters a hot tube evaporator; after the gas is subjected to heat exchange, the gas enters a sinter plate dust catcher, is dedusted and enters a current-sharing heat exchange chamber; the gas is pressed in an exhaust funnel by a main fan and is exhausted into the atmosphere; meanwhile, circulating water absorbs the heat of the flue gas from the heat exchanger to form steam-water mixer; the steam-water mixer enters the evaporator and releases the heat; organic working medium liquid absorbs the heat of the steam-water mixer to become working medium steam; the working medium steam expands in an organic turbine with a steam replenishing opening to do work and drives a power generator to generate power. The organic Rankine waste heat power generation method is characterized in that R152a is adopted as an organic circulating working medium. According to the method disclosed by the invention, the gradient utilization of waste heat of high-content dust-containing flue gas from the ferroalloy furnace can be realized; heat energy in the flue gas is converted into high-grade electric energy; the heat efficiency of the method can be improved by 29-32 percent when compared with that of a single-stage evaporation organic Rankine mode, and a good environment-friendly effect can be achieved.
Description
Art
The present invention relates to a kind of ferro-alloy furnace flue gas organic Rankine method for power generation by waste heat, can the thermal energy to greatest extent in recovered flue gas be specifically high-grade electric energy, can dust collection capacity be improved again, belong to fume afterheat and utilize and dedusting technology field.
Background technology
Ferro-alloy furnace flue-gas temperature is very high, and after trapping, enter the temperature of pipeline generally at about 700 DEG C, dust concentration reaches 15g/Nm
3, the ash being less than 5um accounts for more than 90% of dust total amount, and Dust Capacity is large, and sticky and thin.Usually the method for first heat exchange cooling (heat exchange cooling method has: mechanical cooler heat exchange, misting cooling heat exchange etc.) dedusting is afterwards adopted at present.There is shortcomings in said method:
1, dedusting after mechanical cooler heat exchange: cooling-down effect is poor, input gas temperature is no should be greater than 450 DEG C, and cooling is limited in scope, and machine cooler tube wall is stifled ash easily, and cause burning cloth bag, system cannot normally be run.
2, dedusting after misting cooling heat exchange: the content increasing water in flue gas, not only makes cloth bag harden, also easily cause water and dust bonding, cause system equipment to block.
Due to above shortcoming, many ash-blowing methods are adopted: as shock-wave ash blowing, steam soot blowing, fall ball deashing etc. in engineering, but glue because dust is thin, and Dust Capacity is large, often produce 1 ton of steel and will produce 35kg dust, these purge modes produce little effect, and cannot fundamentally solve dust stratification, blockage problem.
Summary of the invention
For the problems referred to above, the invention provides ferro-alloy furnace flue gas organic Rankine method for power generation by waste heat, can not only the thermal energy to greatest extent in recovered flue gas be high-grade electric energy by the method, drag dedusting fan, the exhaust temperature of flue gas can be reduced, the environment protecting reached simultaneously, and not affect the stable and continuous of ferro-alloy furnace production, good dust removing effects can also be obtained, the dust concentration 3mg/Nm of discharge
3.
The technical solution adopted in the present invention is as follows:
Ferro-alloy furnace flue gas organic Rankine method for power generation by waste heat, it is characterized in that: ferro-alloy furnace flue gas of the present invention is discharged by stove, cold wind is mixed into through water-cooled flue, combustion settling chamber is entered after combusting carbon monoxide gas, the effect of combustion settling chamber is: reduce flue gas flow rate, make the big dust particle sedimentation of carrying in flue gas, and be suitably mixed into cold wind, finally burn CO gas, high-temperature heat pipe evaporimeter is entered by combustion settling chamber flue gas out, water in steam drum produces steam and enters steam drum absorb high-temperature flue gas waste heat in high-temperature heat pipe evaporimeter after, steam in steam drum enters steam accumulator by pipeline, outer for stable after regulating, continuously, parameter meets the steam of user's requirement for generating, after high-temperature heat pipe evaporator heat exchange, flue-gas temperature fluctuating range can greatly reduce, also reduce the peak value of flue-gas temperature simultaneously, flue gas becomes middle low-temperature flue gas from high temperature, enter sinter-plate precipitator again, dust concentration 3mg/Nm after dedusting
3, then enter in middle low temperature current-sharing Heat Room, flue gas releases heat, temperature is down to 80 DEG C, be pressed into aiutage by main air blower and enter air, simultaneously, recirculated water is driven by heat exchanger feed pump, enter the heat absorbing flue gas in the uniform flow primary surface heat exchanger be installed in middle low temperature current-sharing Heat Room, form steam water interface, the temperature of steam water interface 185 DEG C, steam water interface Natural Circulation try hard to recommend dynamic under enter in hiigh pressure stage evaporimeter and release heat, temperature is down to 125 DEG C, then enter in medium pressure grade evaporimeter and release heat, water temperature is down to 95 DEG C, enter again in low-pressure stage evaporimeter and release heat, water temperature is down to 60 DEG C, become water at low temperature, water at low temperature flows into circulating water pool, start new round circulation, simultaneously, through the organic working medium liquid of condensation, through the driving of low-pressure stage working medium force (forcing) pump, in low-pressure stage evaporimeter, first absorb the heat of waste heat carrier, become low-pressure stage working substance steam, one tunnel enters the low pressure filling mouth of the organic turbine of band filling mouth through pipeline, another road is after the pressurization of medium pressure grade working medium force (forcing) pump, enter the heat absorbing waste heat carrier in medium pressure grade evaporimeter, become medium pressure grade working substance steam, one tunnel enters in the organic turbine of band filling mouth through pipeline and presses filling mouth, another road is after the pressurization of hiigh pressure stage working medium force (forcing) pump, enter the heat absorbing waste heat carrier in hiigh pressure stage evaporimeter, become hiigh pressure stage working substance steam, the high-pressure admission cylinder of the organic turbine of band filling mouth is entered through pipeline, working substance steam is expansion work in the organic turbine of band filling mouth, and drive threephase generator to generate electricity, the electric energy that system sends is three-phase alternating current, rated voltage is 380V, electrical network in factory is incorporated to after caning be passed through pressure regulation, or directly give electrical equipment use, the working substance steam of discharging from the organic turbine of band filling mouth is condensed into saturated liquid by shell-and-tube cooler, enter fluid reservoir, fluid reservoir can guarantee low-pressure stage working medium force (forcing) pump continuous pressure, send in low-pressure stage evaporimeter after worker quality liquid being pressurizeed by low-pressure stage working medium force (forcing) pump again, start new round circulation, from shell-and-tube cooler recirculated water out, cooled 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: adopt R152a to be circulation organic working medium.
Because the fluctuation of ferro-alloy furnace flue-gas temperature is violent, flue-gas temperature peak value is high, when flue gas is after high-temperature heat pipe evaporator heat exchange of the present invention, flue-gas temperature fluctuating range can greatly reduce, also reduce the peak value of flue-gas temperature simultaneously, flue gas becomes middle low-temperature flue gas from high temperature, enter middle low temperature current-sharing Heat Room, through the heat exchange of uniform flow primary surface heat exchanger, reclaimed the waste heat of low-temperature flue gas in ferro-alloy furnace again by the cogeneration of multistage evaporation organic Rankine bottoming cycle, realize ferro-alloy furnace fume afterheat cascade utilization.
The present invention and single-stage list press the maximum difference of organic Rankine bottoming cycle to be, the present invention adopts the measure of multistage evaporation in the high, medium and low evaporimeter of organic working medium, utilize the low-temperature zone (import 95 DEG C of hot water, export 60 DEG C) heating working medium generation low pressure working fluid steam, enter the low pressure filling mouth expansion work of organic turbine; Press working substance steam in utilizing the middle-temperature section of hot water (import 125 DEG C exports 95 DEG C) heating working medium to produce, enter the middle pressure filling mouth expansion work of organic turbine; Utilize high temperature section (import 185 DEG C the exports 125 DEG C) heating working medium of saturated vapor to produce high-pressure working medium steam, enter the high pressure cylinder expansion acting of organic turbine; Realize residual heat stream to heat the step dividing potential drop of organic working medium, in heating surface at different levels, so just decrease the lack of uniformity of the heat transfer temperature difference between residual heat stream and working medium, reduce the entropy increasing because different transfer of heat irreversible loss brings, the comparable single-stage evaporation organic Rankine bottoming cycle of its thermal efficiency improves 29 ~ 32%, reduce the exhaust temperature of flue gas, decrease thermal pollution, the environmental requirement reached.
Adopt device for generating power by waste heat after first dedusting, namely first high ash-laden gas is entered sinter-plate precipitator purification, the dust concentration after purification is down to 3mg/Nm
3become clean flue gas, solve the deashing problem that uniform flow primary surface heat exchanger brings due to the blocking of dust.
After waste heat power generation equipment of the present invention is placed on sinter-plate precipitator, thermal source dust content is low, therefore can be very little by the heat exchange core cell spacing of fin design in middle low temperature current-sharing Heat Room; And ash, deashing, defeated grey facility need not be unloaded; Volume reduces, and maintenance reduces simultaneously, and also extend the service life of uniform flow primary surface heat exchanger, dust emission concentration is lower.
Compared with the prior art the present invention has the following advantages:
1. adopt high-temperature heat pipe evaporimeter to reclaim the waste heat of ferro-alloy furnace high-temperature flue gas, the cogeneration of multistage evaporation organic Rankine bottoming cycle to reclaim the waste heat of low-temperature flue gas in ferro-alloy furnace, realize ferro-alloy furnace fume afterheat cascade utilization;
2. cooled 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;
3. uniform flow primary surface heat exchanger not dust stratification, does not block, and heat exchange efficiency improves 8 ~ 9 times;
4. eliminate the soot blower system of uniform flow primary surface heat exchanger, thus reduce cost and operating cost;
5. adopt sinter-plate precipitator, concentration of emission 3mg/Nm
3;
6. applied range, ferro-alloy furnace dedusting cogeneration all can adopt.
Accompanying drawing explanation
Fig. 1 realizes process chart of the present invention.
In figure: 1. ferro-alloy furnace, 2. water-cooled flue, 3. combustion settling chamber, 4. high-temperature heat pipe evaporimeter, 5. steam drum, 6. steam accumulator, 7. sinter-plate precipitator, 8. low temperature current-sharing Heat Room in, 9. uniform flow primary surface heat exchanger, 10. main air blower, 11. aiutages, 12. heat exchanger feed pumps, 13. circulating water pools, 14. low-pressure stage evaporimeters, 15. medium pressure grade evaporimeters, 16. hiigh pressure stage evaporimeters, 17. low-pressure stage working medium force (forcing) pumps, 18. medium pressure grade working medium force (forcing) pumps, 19. hiigh pressure stage working medium force (forcing) pumps, 20. fluid reservoirs, the organic turbine of 21. band filling mouth, 22. threephase generators, 23. water circulating pumps, 24. shell-and-tube coolers, 25. 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: ferro-alloy furnace flue gas organic Rankine method for power generation by waste heat step of the present invention is as follows:
30000KVA ferro-alloy furnace exhaust smoke level 28 × 10
4/ Nm
3/ h, temperature 700 DEG C, dust content 35g/Nm
3discharge by stove, be mixed into cold wind through water-cooled flue 2, after combusting carbon monoxide 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 be suitably mixed into cold wind, finally burn CO gas, high-temperature heat pipe evaporimeter 4 is entered by combustion settling chamber 3 flue gas out, water in steam drum 5 produces steam and enters steam drum 5 absorb high-temperature flue gas waste heat in high-temperature heat pipe evaporimeter 4 after, steam in steam drum 5 enters steam accumulator 6 by pipeline, outer for stable after regulating, continuously, parameter meets the steam of user's requirement for generating, after high-temperature heat pipe evaporimeter 4 heat exchange, flue-gas temperature fluctuating range can greatly reduce, also reduce the peak value of flue-gas temperature simultaneously, flue gas becomes middle low-temperature flue gas from high temperature, enter sinter-plate precipitator 7 again, dust concentration 3mg/Nm after dedusting
3, then enter in middle low temperature current-sharing Heat Room 8, flue gas releases heat, temperature is down to 80 DEG C, be pressed into aiutage 11 by main air blower 10 and enter air, simultaneously, recirculated water is driven by heat exchanger feed pump 12, enter the heat absorbing flue gas in the uniform flow primary surface heat exchanger 9 be installed in middle low temperature current-sharing Heat Room 8, form steam water interface, the temperature of steam water interface 185 DEG C, steam water interface Natural Circulation try hard to recommend dynamic under enter in hiigh pressure stage evaporimeter 16 and release heat, temperature is down to 125 DEG C, then enter in medium pressure grade evaporimeter 15 and release heat, water temperature is down to 95 DEG C, enter again in low-pressure stage evaporimeter 14 and release heat, water temperature is down to 60 DEG C, become water at low temperature, water at low temperature flows into circulating water pool 13, start new round circulation, simultaneously, through the organic working medium liquid of condensation, through the driving of low-pressure stage working medium force (forcing) pump 17, in low-pressure stage evaporimeter 14, first absorb the heat of waste heat carrier, become low-pressure stage working substance steam, one tunnel enters the low pressure filling mouth of the organic turbine 21 of band filling mouth through pipeline, another road is after the pressurization of medium pressure grade working medium force (forcing) pump 18, enter the heat absorbing waste heat carrier in medium pressure grade evaporimeter 15, become medium pressure grade working substance steam, one tunnel enters in the organic turbine 21 of band filling mouth through pipeline and presses filling mouth, another road is after the pressurization of hiigh pressure stage working medium force (forcing) pump 19, enter the heat absorbing waste heat carrier in hiigh pressure stage evaporimeter 16, become hiigh pressure stage working substance steam, the high-pressure admission cylinder of the organic turbine 21 of band filling mouth is entered through pipeline, working substance steam is expansion work in the organic turbine 21 of band filling mouth, and drive threephase generator 22 to generate electricity, the electric energy that system sends is three-phase alternating current, rated voltage is 380V, electrical network in factory is incorporated to after caning be passed through pressure regulation, or directly give electrical equipment use, the working substance steam of discharging from the organic turbine 21 of band filling mouth is condensed into saturated liquid by shell-and-tube cooler 24, enter fluid reservoir 20, fluid reservoir 20 can guarantee low-pressure stage working medium force (forcing) pump 17 continuous pressure, send in low-pressure stage evaporimeter 14 after worker quality liquid being pressurizeed by low-pressure stage working medium force (forcing) pump 17 again, start new round circulation, from shell-and-tube cooler 24 recirculated water out, cooled by lithium-bromide absorption-type refrigerating machine 25, 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 24 through water circulating pump 23, start new round circulation.
Described low boiling working fluid is R152a, three grades of evaporations, low-pressure stage evaporating pressure is 0.351MPa, medium pressure grade evaporating pressure is 0.524MPa, hiigh pressure stage evaporating pressure is 1.356MPa, and when the power pressure after expansion work is 0.348MPa, system electromotive power output is 2000KW, Rankine cycle efficiency is 26.58%, and the flue-gas temperature that system is discharged is 80 DEG C.
Maximum feature of the present invention be adopt high-temperature heat pipe evaporimeter to reclaim ferro-alloy furnace high-temperature flue gas waste heat for generating steam generating, adopt first dedusting again after the cogeneration of multistage evaporation organic Rankine bottoming cycle to reclaim the waste heat of low-temperature flue gas in ferro-alloy furnace, realize the exhaust heat stepped utilization of ferro-alloy furnace height ash-laden gas.For the waste heat recovery of 30000KVA ferro-alloy furnace and dust collecting process, the inventive method compares with conventional method, is described as follows:
Note: work per year and calculate for 330th.
As can be seen here, the inventive method can realize the exhaust heat stepped utilization of ferro-alloy furnace height ash-laden gas, the thermal energy reclaimed to greatest extent in ferro-alloy furnace height ash-laden gas is high-grade electric energy, the comparable single-stage evaporation organic Rankine bottoming cycle of its thermal efficiency improves 29 ~ 32%, uniform flow primary surface heat exchanger need not unload ash, deashing, defeated grey facility, extend the service life of equipment, the exhaust temperature of flue gas can be reduced simultaneously, and do not affect the stable and continuous of ferro-alloy furnace production, the environment protecting that can also obtain, the dust concentration 3mg/Nm of discharge
3, plant investment is low, operation energy consumption is low.
Claims (2)
1. ferro-alloy furnace flue gas organic Rankine method for power generation by waste heat, it is characterized in that: ferro-alloy furnace flue gas of the present invention is discharged by stove, cold wind is mixed into through water-cooled flue, combustion settling chamber is entered after combusting carbon monoxide gas, the effect of combustion settling chamber is: reduce flue gas flow rate, make the big dust particle sedimentation of carrying in flue gas, and be suitably mixed into cold wind, finally burn CO gas, high-temperature heat pipe evaporimeter is entered by combustion settling chamber flue gas out, water in steam drum produces steam and enters steam drum absorb high-temperature flue gas waste heat in high-temperature heat pipe evaporimeter after, steam in steam drum enters steam accumulator by pipeline, outer for stable after regulating, continuously, parameter meets the steam of user's requirement for generating, after high-temperature heat pipe evaporator heat exchange, flue-gas temperature fluctuating range can greatly reduce, also reduce the peak value of flue-gas temperature simultaneously, flue gas becomes middle low-temperature flue gas from high temperature, enter sinter-plate precipitator again, dust concentration 3mg/Nm after dedusting
3, then enter in middle low temperature current-sharing Heat Room, flue gas releases heat, temperature is down to 80 DEG C, be pressed into aiutage by main air blower and enter air, simultaneously, recirculated water is driven by heat exchanger feed pump, enter the heat absorbing flue gas in the uniform flow primary surface heat exchanger be installed in middle low temperature current-sharing Heat Room, form steam water interface, the temperature of steam water interface 185 DEG C, steam water interface Natural Circulation try hard to recommend dynamic under enter in hiigh pressure stage evaporimeter and release heat, temperature is down to 125 DEG C, then enter in medium pressure grade evaporimeter and release heat, water temperature is down to 95 DEG C, enter again in low-pressure stage evaporimeter and release heat, water temperature is down to 60 DEG C, become water at low temperature, water at low temperature flows into circulating water pool, start new round circulation, simultaneously, through the organic working medium liquid of condensation, through the driving of low-pressure stage working medium force (forcing) pump, in low-pressure stage evaporimeter, first absorb the heat of waste heat carrier, become low-pressure stage working substance steam, one tunnel enters the low pressure filling mouth of the organic turbine of band filling mouth through pipeline, another road is after the pressurization of medium pressure grade working medium force (forcing) pump, enter the heat absorbing waste heat carrier in medium pressure grade evaporimeter, become medium pressure grade working substance steam, one tunnel enters in the organic turbine of band filling mouth through pipeline and presses filling mouth, another road is after the pressurization of hiigh pressure stage working medium force (forcing) pump, enter the heat absorbing waste heat carrier in hiigh pressure stage evaporimeter, become hiigh pressure stage working substance steam, the high-pressure admission cylinder of the organic turbine of band filling mouth is entered through pipeline, working substance steam is expansion work in the organic turbine of band filling mouth, and drive threephase generator to generate electricity, the electric energy that system sends is three-phase alternating current, rated voltage is 380V, electrical network in factory is incorporated to after caning be passed through pressure regulation, or directly give electrical equipment use, the working substance steam of discharging from the organic turbine of band filling mouth is condensed into saturated liquid by shell-and-tube cooler, enter fluid reservoir, fluid reservoir can guarantee low-pressure stage working medium force (forcing) pump continuous pressure, send in low-pressure stage evaporimeter after worker quality liquid being pressurizeed by low-pressure stage working medium force (forcing) pump again, start new round circulation, from shell-and-tube cooler recirculated water out, cooled 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. ferro-alloy furnace flue gas organic Rankine method for power generation by waste heat according to claim 1, is characterized in that: adopt R152a to be circulation organic working medium.
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| ES2788684A1 (en) * | 2019-04-10 | 2020-10-22 | Palacios Miguel Angel Iglesias | METHOD AND SYSTEM OF ENERGY COGENERATION OF A STEEL TRANSFORMATION PLANT (Machine-translation by Google Translate, not legally binding) |
-
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- 2013-08-09 CN CN201310356277.3A patent/CN104344734A/en active Pending
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| ES2788684A1 (en) * | 2019-04-10 | 2020-10-22 | Palacios Miguel Angel Iglesias | METHOD AND SYSTEM OF ENERGY COGENERATION OF A STEEL TRANSFORMATION PLANT (Machine-translation by Google Translate, not legally binding) |
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Application publication date: 20150211 |