CN103105071A - Method for submerged arc furnace flue gas multistage organic Rankine cycle waste heat power generation - Google Patents
Method for submerged arc furnace flue gas multistage organic Rankine cycle waste heat power generation Download PDFInfo
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Abstract
A method for submerged arc furnace flue gas multistage organic Rankine cycle waste heat power generation is characterized in that submerged arc furnace flue gas is discharged from the interior of a submerged arc furnace, mixed with cold air through a water cooling flue, enters a combustion settling chamber after carbon monoxide gas is combusted, then enters a high temperature dust remover, and enters a heat storage chamber after dust is removed, heat exchanging is completed, the flue gas is impressed into an exhaust funnel by a main air blower, and discharged to atmosphere. Meanwhile, circulating water drives a water pump through a heat exchanger and enters the heat exchanger installed inside the heat storage chamber to absorb heat of the flue gas, so that a steam-water mixture is formed. An organic working medium absorbs heat of the steam-water mixture, expands and works in a multistage organic turbine, and drives a generator to generate electricity. The method is characterized in that a stainless steel filter core is arranged in the high temperature dust remover, and is further characterized in that R413a is adopted as the organic working medium. According to the method for the submerged arc furnace flue gas multistage organic Rankine cycle waste heat power generation, heat energy in the flue gas can be recovered to the maximum degree and directly converted to high-grade electric energy, the efficiency of the submerged arc furnace is improved by 10 percent to 20 percent when compared with single-stage evaporation organic Rankie, and moreover a good environment-friendly effect can be achieved.
Description
Affiliated technical field
The present invention relates to the multistage organic Rankine circulation of a kind of mineral heating furnace flue method for power generation by waste heat, specifically the heat energy in recovered flue gas is converted into the high-grade electric energy to greatest extent, can improve dust collection capacity again, belongs to mineral hot furnace dedusting technology field.
Background technology
The mineral heating furnace flue temperature is very high, and the temperature that enters pipeline after capturing is generally 1000 ℃ of left and right, and dust concentration reaches 35g/Nm
3, accounting for more than 80% of dust total amount less than the ash of 5um, Dust Capacity is large, and sticking and thin.Usually the method for dedusting after the first heat exchange cooling of employing at present (the heat exchange cooling method has: mechanical cooler heat exchange, spraying cooling heat transferring, residual heat boiler for exchanging heat etc.).After first heat exchange cooling, there is shortcomings in the method for dedusting:
1, dedusting after the mechanical cooler heat exchange: cooling-down effect is poor, and input gas temperature should not be greater than 450 ℃, and cooling is limited in scope, and machine cooler tube wall is stifled ash easily, causes the burning cloth bag, and system can't normally move.
2, dedusting after the spraying cooling heat transferring: increase the content of water in flue gas, cloth bag is hardened, also easily cause water and dust bonding, cause system equipment to stop up.
3, dedusting after residual heat boiler for exchanging heat: owing to containing a large amount of dust in flue gas, even sticking and thin dust also dust stratification, clogging can occur on the heat-pipe elements of light pipe, heat-pipe elements dust stratification, obstruction for the hoop finned tube are more serious, simultaneously in order to prevent the knot ash, in the UTILIZATION OF VESIDUAL HEAT IN facility, heat exchange core parts spacing of fin is large, not only affect heat exchange efficiency, cause the waste heat boiler steam production not enough, more seriously due to the stifled ash of waste heat boiler, system's fluctuation of service, cause to smelt and produce and normally to carry out, the maintenance of being forced to stop production.
Due to above shortcoming, adopt many ash-blowing methods in engineering: as shock-wave ash blowing, steam soot blowing, ball deashing etc. falls, but because dust carefully glues, and Dust Capacity is large, 1 ton of steel of every production will produce the 35kg dust, these purge modes produce little effect, and can't fundamentally solve dust stratification, blockage problem.
Summary of the invention
The invention provides the multistage organic Rankine circulation of mineral heating furnace flue method for power generation by waste heat, by the method to greatest extent the heat energy in recovered flue gas be converted into the high-grade electric energy, drag dedusting fan, can reduce simultaneously the exhaust temperature of flue gas, reach good environment protecting, and do not affect the stable and continuous of mineral hot furnace production, can also obtain good dust removing effects, the dust concentration 10mg/Nm of discharging
3
The technical solution adopted in the present invention is as follows:
The multistage organic Rankine circulation of mineral heating furnace flue method for power generation by waste heat, it is characterized in that: mineral heating furnace flue of the present invention is sneaked into cold wind by discharging in stove through water-cooled flue, enters combustion settling chamber after the burning CO 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 suitably sneak into cold wind, finally burn CO gas, 600 ℃ of the flue-gas temperatures of adjusting control expansion chamber, enter hot precipitator by combustion settling chamber flue gas out, dust concentration 10mg/Nm after dedusting
3Then enter regenerator, high-temperature flue gas is emitted heat, completes heat exchange, and temperature is down to 90 ℃, is pressed into aiutage by main air blower and enters atmosphere.Simultaneously, recirculated water drives by the heat exchanger feed pump, enter the heat that absorbs flue gas in the separation sleeve tubing hot-pipe heat exchanger that is installed in regenerator, form steam water interface (150 ℃ of temperature), steam water interface is tried hard to recommend in Natural Circulation and is emitted heat in entering the hiigh pressure stage evaporimeter under moving, temperature is down to 120 ℃, then enter in the medium pressure grade evaporimeter and emit heat, temperature is down to 90 ℃, enter in the low-pressure stage evaporimeter again and emit heat, temperature is down to 60 ℃, becomes water at low temperature, water at low temperature flows into circulating water pool, the circulation of a beginning new round.
Simultaneously, through the organic working medium liquid of condensation, through the driving of low-pressure stage working medium force (forcing) pump, first absorb the heat of waste heat carrier in the low-pressure stage evaporimeter, become the low-pressure stage working substance steam; One the tunnel enters low pressure filling mouth with the organic turbine of filling mouth through pipeline, and another road enters the heat that absorbs the waste heat carrier in the medium pressure grade evaporimeter after the pressurization of medium pressure grade working medium force (forcing) pump, become the medium pressure grade working substance steam; One the tunnel enters middle pressure filling mouth with the organic turbine of filling mouth through pipeline, and another road enters the heat that absorbs the waste heat carrier in the hiigh pressure stage evaporimeter after the pressurization of hiigh pressure stage working medium force (forcing) pump, become the hiigh pressure stage working substance steam; Enter high-pressure admission cylinder with the organic turbine of filling mouth through pipeline, the working substance steam acting of expanding in multistage organic turbine, and drive the threephase generator generating.Be condensed into saturated liquid from the working substance steam of discharging with the organic turbine of filling mouth by shell-and-tube cooler, then send in the low-pressure stage evaporimeter circulation of a beginning new round after by low-pressure stage working medium force (forcing) pump, worker quality liquid being pressurizeed.The recirculated water of coming from cooling tower drives by water circulating pump, enters to absorb heat in shell-and-tube cooler, tries hard to recommend in Natural Circulation to enter in cooling tower under moving, emits heat, becomes water at low temperature, the circulation of a beginning new round.The electric energy that system sends is three-phase alternating current, and rated voltage is 380V, can incorporate electrical network in factory into through after pressure regulation, or directly gives consumer and use.
It is further characterized in that: adopting R413a is the circulation organic working medium.
The invention has the beneficial effects as follows: due to after device for generating power by waste heat of the present invention is placed on hot precipitator, the thermal source dust content is low, therefore can the design of the heat exchange core cell spacing of fin in regenerator is very little; And need not unload ash, deashing, defeated grey facility; Volume reduces, and maintenance reduces simultaneously, has also extended the service life of separation sleeve tubing hot-pipe heat exchanger, and dust emission concentration is lower.The difference that this generating equipment and single-stage singly are pressed with machine Rankine cycle maximum is, this generating equipment adopts the measure of multistage evaporation in the high, medium and low evaporimeter of organic working medium, utilize low-temperature zone (90 ℃ of the imports of hot water, export 60 ℃) heating working medium generation low pressure working fluid steam, the low pressure filling mouth that enters organic turbine expands and does work; Utilize middle-temperature section (120 ℃ of imports the export 90 ℃) heating working medium of hot water to press working substance steam in producing, the middle pressure filling mouth that the enters organic turbine acting of expanding; Utilize high temperature section (150 ℃ of imports the export 120 ℃) heating working medium of saturated vapor to produce high-pressure working medium steam, enter the high pressure cylinder expansion acting of organic turbine; Realize that residual heat stream is to the step dividing potential drop heating of organic working medium, so just reduced the lack of uniformity of the heat transfer temperature difference between residual heat stream and working medium in heating surfaces at different levels, having reduced the entropy that brings due to the different transfer of heat irreversible loss increases, can improve 10～20% on the basis of single-stage evaporation organic Rankine thermal efficiency of cycle, reduced the exhaust temperature of flue gas, concentration of emission is low, can guarantee to discharge dust concentration at 10mg/Nm
3
Compared with prior art, the present invention has following advantage, economic effect:
1, the heat energy in recovered flue gas is converted into the high-grade electric energy to greatest extent, and its thermal efficiency ratio single-stage evaporation organic Rankine improves 10～20%.
2, satisfy the requirement of recycling economy, meet the national policy of energy-saving and emission-reduction.
3, separation sleeve tubing hot-pipe heat exchanger dust stratification not, do not stop up, and heat exchange efficiency improves 8～9 times.
4, save the soot blower system of heat exchange of heat pipe, thereby reduced cost and operating cost.
5, adopt high temperature resistant stainless steel material filter element deduster, concentration of emission 10mg/Nm
3
6, applied range, mineral hot furnace dedusting cogeneration all can be adopted.
In sum, the inventive method adopts the device of cogeneration after first dedusting, and smoke dust discharge concentration is low, and generated energy is many, installs stable energy consumption low.
Description of drawings
Fig. 1 is the process chart of realizing the multistage organic Rankine circulation of mineral heating furnace flue of the present invention method for power generation by waste heat.
In Fig. 1: 1. mineral hot furnace, 2. water-cooled flue, 3. combustion settling chamber, 4. hot precipitator, 5. regenerator, 6. main air blower, 7. aiutage, 8. separation sleeve tubing hot-pipe heat exchanger, 9. heat exchanger feed pump, 10. circulating water pool, 11. low-pressure stage evaporimeters, 12. medium pressure grade evaporimeter, 13. the hiigh pressure stage evaporimeter, 14. low-pressure stage working medium force (forcing) pumps, 15. medium pressure grade working medium force (forcing) pumps, 16. hiigh pressure stage working medium force (forcing) pump, 17. the organic turbine of band filling mouth, 18. threephase generators, 19. water circulating pumps, 20. shell-and-tube cooler, 21. cooling towers.
The specific embodiment
The invention will be further described below in conjunction with accompanying drawing:
As shown in Figure 1: the multistage organic Rankine circulation of mineral heating furnace flue of the present invention method for power generation by waste heat step is as follows:
25500KVA mineral hot furnace 1 flue gas flow 15 * 10
4Nm
3/ h, 1000 ℃ of temperature, dust content 35g/Nm
3By discharging in stove, sneak into cold wind through water-cooled flue 2, enter combustion settling chamber 3 after 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 flue gas, and suitably sneak into cold wind, finally burn CO gas, 600 ℃ of the flue-gas temperatures of adjusting control expansion chamber, enter hot precipitator 4 by combustion settling chamber 3 flue gas out, dust concentration 10mg/Nm after dedusting
3Then enter regenerator 5, high-temperature flue gas is emitted heat, completes heat exchange, and temperature is down to 90 ℃, 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 separation sleeve tubing hot-pipe heat exchanger 8 that is installed in regenerator 4, form steam water interface (150 ℃ of temperature), steam water interface is tried hard to recommend in Natural Circulation and is emitted heat in entering hiigh pressure stage evaporimeter 13 under moving, temperature is down to 120 ℃, then enter in medium pressure grade evaporimeter 12 and emit heat, temperature is down to 90 ℃, enter in low-pressure stage evaporimeter 11 again and emit heat, temperature is down to 60 ℃, becomes water at low temperature, water at low temperature flows into circulating water pool 10, the circulation of a beginning new round.
Simultaneously, through the organic working medium liquid of condensation, through the driving of low-pressure stage working medium force (forcing) pump 14, first absorb the heat of waste heat carrier in low-pressure stage evaporimeter 11, become the low-pressure stage working substance steam; One the tunnel enters low pressure filling mouth with the organic turbine 17 of filling mouth through pipeline, and another road enters the heat that absorbs the waste heat carrier in medium pressure grade evaporimeter 12 after 15 pressurizations of medium pressure grade working medium force (forcing) pump, become the medium pressure grade working substance steam; One the tunnel enters middle pressure filling mouth with the organic turbine 17 of filling mouth through pipeline, and another road enters the heat that absorbs the waste heat carrier in hiigh pressure stage evaporimeter 13 after 16 pressurizations of hiigh pressure stage working medium force (forcing) pump, become the hiigh pressure stage working substance steam; Enter high-pressure admission cylinder with the organic turbine 17 of filling mouth through pipeline, working substance steam is in the interior expansion acting of multistage organic turbine 17, and drives threephase generator 18 generatings.Be condensed into saturated liquid from the working substance steam of discharging with the organic turbine 17 of filling mouth by shell-and-tube cooler 20, then send in low-pressure stage evaporimeter 11 circulation of a beginning new round after by low-pressure stage working medium force (forcing) pump 14, worker quality liquid being pressurizeed.The recirculated water of coming from cooling tower 21 drives by water circulating pump 19, enters in shell-and-tube cooler 20 to absorb heat, tries hard to recommend in Natural Circulation to enter in cooling tower 21 under moving, emits heat, becomes water at low temperature, the circulation of a beginning new round.The electric energy that system sends is three-phase alternating current, and rated voltage is 380V, can incorporate electrical network in factory into through after pressure regulation, or directly gives consumer and use.
Described low boiling organic working medium is R413a, three grades of evaporations, the low-pressure stage evaporating pressure is 0.43MPa, the medium pressure grade evaporating pressure is 0.86MPa, the hiigh pressure stage evaporating pressure is 1.75MPa, and when the power pressure after the acting of expanding was 0.31MPa, system's electromotive power output was 2000KW, Rankine cycle efficient is 21%, and the flue-gas temperature that system discharges is 90 ℃.
Adopt device for generating power by waste heat after first dedusting, namely first high-temperature dust-containing flue gas being entered the stainless steel material filter-element dust collector purifies, stainless steel material filter core in deduster, generally can bear the long-term work temperature of 600 ℃ of left and right, high energy bears the high temperature of 650 ℃, and can bear that high temperature is oarse-grained to be washed away, therefore can the direct purification high-temperature flue gas, and do not need to do any pretreatment.Dust concentration after purification is down to 10mg/Nm
3Become clean flue gas, do not need to process the problem such as obstruction, deashing of dust.
Maximum characteristics of the present invention are waste heats that after the first dedusting of employing, mineral heating furnace flue is reclaimed in multistage evaporation organic Rankine circulation cogeneration.Take the waste heat recovery of 25500KVA mineral hot 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, the inventive method heat energy in recovered flue gas to greatest extent is converted into the high-grade electric energy, its thermal efficiency ratio single-stage evaporation organic Rankine circulation improves 10～20%, separation sleeve tubing hot-pipe heat exchanger need not unload ash, deashing, defeated grey facility, extend the service life of equipment, can reduce the exhaust temperature of flue gas simultaneously, and do not affected the stable and continuous of mineral hot furnace STEELMAKING PRODUCTION, the environment protecting that can also obtain, the dust concentration 10mg/Nm of discharging
3Plant investment is low, operation energy consumption is low.
Claims (3)
1. the multistage organic Rankine circulation of mineral heating furnace flue method for power generation by waste heat, it is characterized in that: mineral heating furnace flue of the present invention is sneaked into cold wind by discharging in stove through water-cooled flue, enters combustion settling chamber after the burning CO 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 suitably sneak into cold wind, finally burn CO gas, 600 ℃ of the flue-gas temperatures of adjusting control expansion chamber, enter hot precipitator by combustion settling chamber flue gas out, dust concentration 10mg/Nm after dedusting
3Then enter regenerator, high-temperature flue gas is emitted heat, completes heat exchange, and temperature is down to 90 ℃, is pressed into aiutage by main air blower and enters atmosphere.Simultaneously, recirculated water drives by the heat exchanger feed pump, enter the heat that absorbs flue gas in the separation sleeve tubing hot-pipe heat exchanger that is installed in regenerator, form steam water interface (150 ℃ of temperature), steam water interface is tried hard to recommend in Natural Circulation and is emitted heat in entering the hiigh pressure stage evaporimeter under moving, temperature is down to 120 ℃, then enter in the medium pressure grade evaporimeter and emit heat, temperature is down to 90 ℃, enter in the low-pressure stage evaporimeter again and emit heat, temperature is down to 60 ℃, becomes water at low temperature, water at low temperature flows into circulating water pool, the circulation of a beginning new round.Simultaneously, through the organic working medium liquid of condensation, through the driving of low-pressure stage working medium force (forcing) pump, first absorb the heat of waste heat carrier in the low-pressure stage evaporimeter, become the low-pressure stage working substance steam; One the tunnel enters low pressure filling mouth with the organic turbine of filling mouth through pipeline, and another road enters the heat that absorbs the waste heat carrier in the medium pressure grade evaporimeter after the pressurization of medium pressure grade working medium force (forcing) pump, become the medium pressure grade working substance steam; One the tunnel enters middle pressure filling mouth with the organic turbine of filling mouth through pipeline, and another road enters the heat that absorbs the waste heat carrier in the hiigh pressure stage evaporimeter after the pressurization of hiigh pressure stage working medium force (forcing) pump, become the hiigh pressure stage working substance steam; Enter high-pressure admission cylinder with the organic turbine of filling mouth through pipeline, the working substance steam acting of expanding in multistage organic turbine, and drive the threephase generator generating.Be condensed into saturated liquid from the working substance steam of discharging with the organic turbine of filling mouth by shell-and-tube cooler, then send in the low-pressure stage evaporimeter circulation of a beginning new round after by low-pressure stage working medium force (forcing) pump, worker quality liquid being pressurizeed.The recirculated water of coming from cooling tower drives by water circulating pump, enters to absorb heat in shell-and-tube cooler, tries hard to recommend in Natural Circulation to enter in cooling tower under moving, emits heat, becomes water at low temperature, the circulation of a beginning new round.The electric energy that system sends is three-phase alternating current, and rated voltage is 380V, can incorporate electrical network in factory into through after pressure regulation, or directly gives consumer and use.
2. the multistage organic Rankine circulation of mineral heating furnace flue according to claim 1 method for power generation by waste heat, is characterized in that: be provided with the stainless steel material filter core in described hot precipitator.
3. the multistage organic Rankine circulation of mineral heating furnace flue according to claim 1 method for power generation by waste heat is characterized in that: adopting R413a is the circulation organic working medium.
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106766965A (en) * | 2017-02-08 | 2017-05-31 | 中冶华天工程技术有限公司 | A kind of converter and heater for rolling steel waste heat integrated power generation system |
| CN113654034A (en) * | 2021-07-20 | 2021-11-16 | 山东联盟化工股份有限公司 | Comprehensive recycling technology for low-grade steam containing acidic non-condensable gas |
-
2011
- 2011-11-14 CN CN2011103692354A patent/CN103105071A/en active Pending
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106766965A (en) * | 2017-02-08 | 2017-05-31 | 中冶华天工程技术有限公司 | A kind of converter and heater for rolling steel waste heat integrated power generation system |
| CN106766965B (en) * | 2017-02-08 | 2019-02-19 | 中冶华天工程技术有限公司 | A kind of converter and heater for rolling steel waste heat integrated power generation system |
| CN113654034A (en) * | 2021-07-20 | 2021-11-16 | 山东联盟化工股份有限公司 | Comprehensive recycling technology for low-grade steam containing acidic non-condensable gas |
| CN113654034B (en) * | 2021-07-20 | 2023-08-29 | 山东联盟化工股份有限公司 | Comprehensive recycling method for low-grade steam containing acidic noncondensable gas |
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Application publication date: 20130515 |