CN103133070B - Vapor Rankine-low boiling point working medium Rankine combined cycle power generation device - Google Patents
Vapor Rankine-low boiling point working medium Rankine combined cycle power generation device Download PDFInfo
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- CN103133070B CN103133070B CN201310029379.4A CN201310029379A CN103133070B CN 103133070 B CN103133070 B CN 103133070B CN 201310029379 A CN201310029379 A CN 201310029379A CN 103133070 B CN103133070 B CN 103133070B
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- 238000009835 boiling Methods 0.000 title claims abstract description 133
- 238000010248 power generation Methods 0.000 title abstract description 9
- 238000009833 condensation Methods 0.000 claims abstract description 18
- 230000005494 condensation Effects 0.000 claims abstract description 18
- 238000009834 vaporization Methods 0.000 claims abstract description 11
- 230000008016 vaporization Effects 0.000 claims abstract description 11
- 239000012530 fluid Substances 0.000 claims description 119
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 41
- 239000006200 vaporizer Substances 0.000 claims description 32
- 239000007788 liquid Substances 0.000 claims description 14
- 229920006395 saturated elastomer Polymers 0.000 claims description 11
- 239000003507 refrigerant Substances 0.000 claims description 8
- 238000001816 cooling Methods 0.000 claims description 6
- 238000007599 discharging Methods 0.000 claims description 5
- QGZKDVFQNNGYKY-UHFFFAOYSA-N Ammonia Chemical compound N QGZKDVFQNNGYKY-UHFFFAOYSA-N 0.000 abstract description 46
- 229910021529 ammonia Inorganic materials 0.000 abstract description 24
- 238000005260 corrosion Methods 0.000 abstract description 6
- 230000007797 corrosion Effects 0.000 abstract description 6
- 230000008901 benefit Effects 0.000 abstract description 5
- 238000013461 design Methods 0.000 abstract description 3
- 230000007613 environmental effect Effects 0.000 abstract description 3
- 238000010276 construction Methods 0.000 abstract description 2
- 239000000779 smoke Substances 0.000 abstract 3
- 238000004064 recycling Methods 0.000 abstract 1
- 239000003546 flue gas Substances 0.000 description 19
- UGFAIRIUMAVXCW-UHFFFAOYSA-N Carbon monoxide Chemical compound [O+]#[C-] UGFAIRIUMAVXCW-UHFFFAOYSA-N 0.000 description 18
- 238000005516 engineering process Methods 0.000 description 15
- 239000007789 gas Substances 0.000 description 13
- 230000005611 electricity Effects 0.000 description 10
- 239000000126 substance Substances 0.000 description 10
- 235000011114 ammonium hydroxide Nutrition 0.000 description 9
- 239000003517 fume Substances 0.000 description 8
- 239000002918 waste heat Substances 0.000 description 7
- 238000011160 research Methods 0.000 description 6
- 239000000463 material Substances 0.000 description 5
- CYRMSUTZVYGINF-UHFFFAOYSA-N trichlorofluoromethane Chemical compound FC(Cl)(Cl)Cl CYRMSUTZVYGINF-UHFFFAOYSA-N 0.000 description 5
- 239000002699 waste material Substances 0.000 description 5
- 238000010521 absorption reaction Methods 0.000 description 4
- 238000000034 method Methods 0.000 description 4
- 239000000203 mixture Substances 0.000 description 4
- VHUUQVKOLVNVRT-UHFFFAOYSA-N Ammonium hydroxide Chemical compound [NH4+].[OH-] VHUUQVKOLVNVRT-UHFFFAOYSA-N 0.000 description 3
- 230000015572 biosynthetic process Effects 0.000 description 3
- 238000011161 development Methods 0.000 description 3
- 239000002253 acid Substances 0.000 description 2
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- 239000002826 coolant Substances 0.000 description 2
- 238000005265 energy consumption Methods 0.000 description 2
- 239000002360 explosive Substances 0.000 description 2
- 231100000614 poison Toxicity 0.000 description 2
- 230000007096 poisonous effect Effects 0.000 description 2
- 230000008569 process Effects 0.000 description 2
- 238000005057 refrigeration Methods 0.000 description 2
- 230000001105 regulatory effect Effects 0.000 description 2
- 230000009711 regulatory function Effects 0.000 description 2
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- 239000002351 wastewater Substances 0.000 description 2
- 239000006096 absorbing agent Substances 0.000 description 1
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- 230000008859 change Effects 0.000 description 1
- 150000001875 compounds Chemical class 0.000 description 1
- 239000012141 concentrate Substances 0.000 description 1
- 125000004122 cyclic group Chemical group 0.000 description 1
- 238000006477 desulfuration reaction Methods 0.000 description 1
- 239000000428 dust Substances 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000004880 explosion Methods 0.000 description 1
- 238000000605 extraction Methods 0.000 description 1
- 230000002349 favourable effect Effects 0.000 description 1
- 238000003306 harvesting Methods 0.000 description 1
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- 239000002912 waste gas Substances 0.000 description 1
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Classifications
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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
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E20/00—Combustion technologies with mitigation potential
- Y02E20/16—Combined cycle power plant [CCPP], or combined cycle gas turbine [CCGT]
-
- 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
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P10/00—Technologies related to metal processing
- Y02P10/25—Process efficiency
-
- 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
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P80/00—Climate change mitigation technologies for sector-wide applications
- Y02P80/10—Efficient use of energy, e.g. using compressed air or pressurized fluid as energy carrier
- Y02P80/15—On-site combined power, heat or cool generation or distribution, e.g. combined heat and power [CHP] supply
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Abstract
The invention relates to a vapor Rankine-low boiling point working medium Rankine combined cycle power generation device. A condenser for the vapor Rankine cycle serves as an evaporator for the vapor Rankine cycle of a low boiling point working medium such as ammonia; a plenty of latent heat of vaporization released through the vapor condensation is used for efficient power generation of the Rankine cycle of the low boiling point working medium by utilizing the characteristic of higher utilization efficiency of a low boiling point working medium Rankine cycle system for a medium and low temperature heat source; more than 50 kilowatt hours per each ton of the vapor can be recycled only by utilizing the latent heat of vaporization of the vapor of the vapor Rankine cycle for the power generation; at the same time, the safety difficulty of recycling the afterheat of the smoke through the Rankine cycle of the low boiling point working medium is solved, the temperature of the exhaust smoke is reduced efficiently, and low-temperature corrosion of the smoke is avoided. The vapor Rankine-low boiling point working medium Rankine combined cycle power generation device not only can be used for energy-saving reconstruction of the conventional machine set, but also can be used for the design and construction of newly built machine sets, and has remarkable economic, social and environmental protection benefits.
Description
Technical field
The present invention relates to a kind of steam Rankine-low boiling working fluid Rankine combined cycle generating unit, concrete genus thermal power plant field of power equipment technology.
Background technique
Taking water vapor as the thermal power plant of working medium, is to carry out thermal energy to become mechanical energy on a large scale, and the factory transformed mechanical energy into electricity again.The circulation of power station application is very complicated, but in essence, the Rankine cycle be mainly made up of equipment such as boiler, steam turbine, vapour condenser, water pumps has come, its working principle is: feedwater first sends into boiler after feed water pump pressurization, water is by superheated vapor that is heat vaporized, that form High Temperature High Pressure in the boiler, superheated vapor is expansion work in steam turbine, become the exhaust steam of low-temp low-pressure, finally enter vapour condenser and be condensed into condensed water, again through water pump, condensed water is sent into boiler and carry out new circulation.As for the complex loops that thermal power plant uses, only on Rankine cycle basis, in order to improve the thermal efficiency, improved and the new circulation that formed and extraction cycle, the medium of backheat is water.Rankine cycle has become the basic circulation of modern vapor power plant.
Modern big-and-middle-sized steam power plant all adopts the heated feed water extraction cycle that draws gas without any exception, employing is drawn gas after backheat heated feed water, feed temperature is improved, thus improve heating mean temperature, except considerably improving thermal efficiency of cycle, though specific steam consumption increases to some extent, owing to drawing gas step by step, steam discharge rate is reduced, this is conducive to the ratio i.e. internal efficiency ratio η of this circulation of actual acting amount and theoretical acting amount
oiraising, solve simultaneously large steam turbine exhaust stage blade negotiability restriction difficulty, vapour condenser volume also can correspondingly reduce.But still discharge a large amount of latent heats of vaporization when steam condenses in vapour condenser, need a large amount of water or air to cool, namely waste heat, cause thermo-pollution, waste again electric energy, water resources.Therefore how effectively to utilize a large amount of latent heat of vaporization discharged during steam condensation in vapour condenser, be worth further investigation.
Give off a large amount of flue gases in station boiler production process, wherein the heat of recoverable is a lot.Although the waste of this part residual heat resources is huge, recycle and have larger difficulty, its main cause is: the quality of (1) waste heat is lower, does not find effective Application way; (2) reclaim the waste heat of this part flue gas, often change is made to the original thermodynamic system of boiler, there is certain risk; (3) thermal balance question is difficult to tissue, is difficult to all directly utilize in inside plants, often needs outwards to find suitable heat user, and heat user often have fluctuation by heat load, thus limit the versatility of recovery method.
Gu Wei etc. (present Research of low temperature heat energy generating and development trend [J]. Thermal power engneering .2007.03.Vol.22, No.2.) describe present Research and the development trend of domestic and international low temperature heat energy generation technology.From the development of the research of low temperature heat energy generation technology in recent years, research work mainly concentrates on aspects such as the improvement of power cycle work Quality Research and cyclic process and optimal controls.Kalina circulation, ammonia absorption type power refrigeration combined cycle etc. can reach the capacity usage ratio higher than simple cycle in theory.Low temperature heat energy generating based on Finite-Time Thermodynamics becomes factor to significant during the affecting of system when considering, may realize the maximization of the Energy harvesting of system.Raising generating efficiency and environmental protection are the core contents of Low Temperature Thermal power technology.The Kalina circulation mentioned in literary composition, ammonia absorption type power refrigeration combined cycle scheduling theory merit attention.
Above-mentionedly mention the shortcoming that card Linne power generation technology also has it intrinsic: as ammonia has inflammable, the explosive feature such as poisonous, when boiler or industrial furnace back-end ductwork utilize fume afterheat to organize card Linne circulating generation, the leakage that in flue gas, dust etc. causes the wearing and tearing, corrosion etc. of the heat exchanger be arranged in flue must be considered, the protection etc. of explosion protection and environment and the job site of drawing thus must be considered; Take ammonia water mixture as the card Linne circulation of working medium, the ammonia in ammoniacal liquor is inflammable, explosive, poisonous medium.This is the difficult problem that card Linne power generation technology reclaims dust-laden, must solve when having the fume afterheat of corrosive deposit in electric power station system.
Therefore the thermomechanics basic law in steam Rankine cycle thermal power plant how is utilized, use for reference the innovative approach that the combined cycle scheduling theory such as thinking and Rankine-Kalina is organized in compound Rankine cycle, retain the advantage based on the power plant technology of Rankine cycle principle, inquire into new combined cycle theoretical, really find the new way increasing substantially thermodynamic cycle power plant thermal efficiency, become the difficult point of this area research.
Summary of the invention
Object of the present invention is for solving above-mentioned steam Rankine cycle and card Linne circulating technology Problems existing, a kind of new thermal power plant's combined cycle flow process is proposed, i.e. steam Rankine-low boiling working fluid Rankine combined cycle generating unit, reducing energy consumption can be carried out to existing steam Rankine cycle, solve the key issue of low boiling working fluid Rankine cycle unit safety operation simultaneously, in recovered steam Rankine cycle vapour condenser, a large amount of latent heat of vaporization of steam condensation release is used for low-temperature end low boiling working fluid Rankine cycle generating, thus realize the thermal efficiency effectively improving whole Combined Cycle Unit, finally reach energy-saving and cost-reducing, improve the object of system thermal efficiency.
The object of the invention is to be realized by following measures:
A kind of steam Rankine-low boiling working fluid Rankine combined cycle generating unit, this device comprises steam Rankine cycle, low boiling working fluid Rankine cycle, it is characterized in that:
Described steam Rankine cycle, refers to by boiler body 1 saturated vapour 2 out, forms superheated vapor 3-1 through the first superheater 3, sends into steam turbine 4 and drives steam-driven generator 21 to generate electricity; Steam turbine 4 exhaust steam 5 out enters condenser/evaporator 10 and forms water of condensation 6, and water of condensation 6 is sent into boiler body 1 through condensate pump 6-1, oxygen-eliminating device 7-1, feed water pump 7, feed water preheater 8, then produced saturated vapour, thus forms steam Rankine cycle circuit.
Described low boiling working fluid Rankine cycle, refer to that liquid refrigerant 11 is through recycle pump 12, condenser/evaporator 10, the low boiling working fluid steam produced is through exhaust steam regenerator 22, first low boiling working fluid steam pipe line 24, second superheater 9, form low boiling working fluid superheated vapor 16, enter low boiling working fluid steam turbine 17 to drag low boiling generator 20 and generate electricity, the exhaust steam of discharging from low boiling working fluid steam turbine 17 cools form liquid refrigerant 11 through exhaust steam regenerator 22, low boiling working fluid condenser 18, enter recycle pump 12 again, thus form low boiling working fluid Rankine cycle circuit.
Described steam Rankine cycle and low boiling working fluid Rankine cycle circuit are combined by condenser/evaporator 10, in the Rankine cycle of high efficiente callback steam, the latent heat of vaporization of steam condensation release is used for low-temperature end low boiling working fluid Rankine cycle generating, and the steam condensation side of described steam Rankine cycle is negative pressure.
The second described superheater 9 adopts the 4-1 that draws gas of steam turbine 4 in steam Rankine cycle as thermal source, and the 4-1 that draws gas cools formation condensed water 26 through the second superheater 9 and returns steam Rankine cycle system.
Described liquid refrigerant comprises low boiling working fluid, for one-component or the multi-component mixing material that is absorbing agent with higher boiling working medium, include but not limited to organic working medium, ammonia water mixture, low boiling working fluid boiling point is at normal atmospheric pressure less than-10 DEG C, and has good thermostability.
When described low boiling working fluid is Multi component, be provided with regenerator 15: liquid refrigerant 11 is through recycle pump 12, regenerator 15, condenser/evaporator 10, the lean solution formed returns condenser low boiling working fluid through regenerator 15, the pipeline 19 that backflows, the low boiling working fluid steam produced forms liquid refrigerant 11 through exhaust steam regenerator 22, second superheater 9, low boiling working fluid steam turbine 17, low boiling working fluid condenser 18, return recycle pump 12, thus form low boiling working fluid Rankine cycle circuit.
Be provided with heat exchanger 13: when heat exchanger 13 is for phase-change heat-exchanger, comprise vaporizer 13-1, condenser 13-2, wherein vaporizer 13-1 is arranged in flue 23, and condenser 13-2 is arranged in outside flue 23, phase-change working substance adopts water or other suitable materials; Flue gas adopts separated type heat exchange mode by the phase-change working substance of phase-change heat-exchanger and condenser/evaporator 10 low boiling working fluid steam out: the heat that phase-change working substance absorbs flue gas in vaporizer 13-1 produces saturated vapour, saturated vapour is as the thermal source of low boiling working fluid steam, by condenser 13-2 and low boiling working fluid steam wall-type heat exchange, form condensation water after cooling and produce steam again by the heat of vaporizer 13-1 absorption flue gas again, thus form the Inner eycle loop of phase-change working substance; Phase-change working substance adopts natural circulation or pump circulation mode; The low boiling working fluid steam that condenser/evaporator 10 exports is through the condenser 13-2 of the second low boiling working fluid steam pipe line 25, heat exchanger 13, the low boiling working fluid superheated vapor 16 formed enters low boiling working fluid steam turbine 17, get back to condenser/evaporator 10 through exhaust steam regenerator 22, low boiling working fluid condenser 18, recycle pump 12 again, thus form low boiling working fluid Rankine cycle circuit.
Be provided with low boiling working fluid vaporizer 14: the exhaust steam that low boiling working fluid vaporizer 14 adopts low boiling working fluid steam turbine 17 to export is as thermal source, the steam produced is through exhaust steam regenerator 22, second superheater 9, low boiling working fluid steam turbine 17, drawing generator 20 generates electricity, the exhaust steam that low boiling working fluid steam turbine 17 is discharged cools form liquid refrigerant 11 through exhaust steam regenerator 22, low boiling working fluid vaporizer 14, low boiling working fluid condenser 18, enter recycle pump 12, low boiling working fluid vaporizer 14 again, thus form low boiling working fluid Rankine cycle circuit; As during for multicomponent, the lean solution that low boiling working fluid vaporizer 14 produces gets back to low boiling working fluid condenser 18 through the pipeline 27 that backflows, condenser/evaporator 10, regenerator 15, the pipeline 19 that backflows.
Described feed water preheater 8, second superheater 9, condenser/evaporator 10, regenerator 15, heat exchanger 13, low boiling working fluid vaporizer 14, exhaust steam regenerator 22 can arrange one or more respectively, adopt series, parallel or series-parallel connection mode to connect.
The air 30 that gas fan 31 is sent here enters air preheater 32, form hot air 33, enter fuel-burning equipment 34 and participate in burning, the high-temperature flue gas of generation is discharged after reducing temperature through boiler body 1, first superheater 3, feed water preheater 8, air preheater 32, vaporizer 13-1.
Described low boiling working fluid condenser 18 conveniently technology is arranged, and adopts water or air etc. as cooling medium.
The heat-exchanging element of aforementioned device mentioned in the present invention can adopt tubulation, fin tube, coiler or spiral groove pipe, or adopts the pipe of other augmentation of heat transfer measures or the hollow cavity heat-exchanging element of other patterns.
While controlling a little higher than flue gas acid dew point temperature of wall surface temperature of vaporizer 13-1 heat exchanger surface, or adopt corrosion-resistant material effectively to alleviate the cold end corrosion of flue gas, can effectively reduce temperature of exhaust fume, avoiding flue gas low-temperature to corrode, high efficiente callback fume afterheat.
Unaccounted equipment and standby system, pipeline, instrument, valve in the present invention, be incubated, there is regulatory function bypass facility etc. adopt known mature technology to carry out supporting.
Be provided with the regulating controller supporting with present system, the known Mature Regulation technology of existing steam Rankine cycle power station, Cheng's cycle power station or gas-steam combined cycle power plant is adopted to carry out supporting, steam Rankine-low boiling working fluid Rankine combined cycle generating unit energy economy, safety, high thermal efficiency are run, reaches energy-saving and cost-reducing object.
The present invention compared to existing technology tool has the following advantages:
1, energy-saving effect is remarkable: the steam Rankine-low boiling working fluid Rankine combined cycle generating unit of the present invention's design, using the vaporizer of the vapour condenser of steam Rankine cycle as low boiling working fluid Rankine cycle, the utilization of low boiling working fluid Rankine cycle system centering low-temperature heat source is utilized to have more high efficiency feature, a large amount of latent heats of vaporization of steam Kanicme cycle vapor condensation release are used for low boiling working fluid Rankine cycle efficiency power generation, only utilize the latent heat of vaporization of steam to generate electricity this block just nearly more than 50 KWhs/ton of steam; The absolute amplitude that in low boiling working fluid Rankine cycle, condenser duty alleviates compared with the vapour condenser in conventional vapor Rankine cycle reaches more than 15%, and the power consumption of cooling circulating water significantly reduces.
2, the three wastes of power plant realize integrated utilization: during the heat exchanger employing phase-change heat-exchanger that back-end ductwork is arranged, can the waste heat of high efficiente callback flue gas, temperature of exhaust fume can be reduced to about 120 DEG C, during phase-change heat-exchanger vaporizer employing resistant material, temperature of exhaust fume can reduce more, reach about 85 DEG C, very favourable to the operation of system for desulfuration and denitration, while effectively avoiding flue gas low-temperature to corrode, the heat reclaimed is used for low boiling working fluid Rankine cycle system efficiency power generation, more meets cascaded utilization of energy principle.The waste heat such as waste water, waste vapour that steam Rankine cycle system produces all can be included low boiling working fluid Rankine cycle system in and recycle.Fundamentally eliminate other waste gas, waste water, waste vapour waste heat recovering device to the impact of whole unit circulation system, realize the integrated utilization of the real meaning of whole power plant system waste heat, water saving, successful such as joint vapour, economize on electricity etc.
3, adopt steam turbine draw gas as the thermal source of steam in low boiling working fluid Rankine cycle, reclaim further draw gas sensible heat, the latent heat of vaporization for low boiling working fluid Rankine cycle generate electricity, the benefit of whole Combined Cycle Unit is improved further.
4, the solution of the present invention both can be used for design, the construction of newly-built combined power plants system, also can be used for carrying out reducing energy consumption to existing pure condensate formula, sucking condensing type unit, the thermodynamic cycle of existing unit is not had a negative impact, the energy-saving potential of the abundant excavating device of energy, meet the industrial policy of country simultaneously, economical and environmental benefit is remarkable.
Accompanying drawing explanation
Fig. 1 is a kind of steam Rankine of the present invention-low boiling working fluid Rankine combined cycle generating unit schematic flow sheet.
In Fig. 1: 1-boiler body, 2-saturated vapour, 3-first superheater, 3-1-superheated vapor, 4-steam turbine, 4-1-draws gas, 5-exhaust steam, 6-water of condensation, 6-1-condensate pump, 7-feed water pump, 7-1-oxygen-eliminating device, 8-feed water preheater, 9-second superheater, 10-condenser/evaporator, 11-liquid refrigerant, 12-recycle pump, 13-heat exchanger, 13-1-vaporizer, 13-2-condenser, 14-low boiling working fluid vaporizer, 15-regenerator, 16-low boiling working fluid superheated vapor, 17-low boiling working fluid steam turbine, 18-low boiling working fluid condenser, 19-backflows liquid, 20-generator, 21-steam-driven generator, 22-exhaust steam regenerator, 23-flue, 24-first low boiling working fluid steam pipe line, 25-second low boiling working fluid steam pipe line, 26-water of condensation, 27-backflows pipeline, 30-air, 31-gas fan, 32-air preheater, 33-hot air, 34-fuel-burning equipment.
Embodiment
Below in conjunction with the drawings and specific embodiments, the present invention is described in further detail.
Embodiment 1:
As shown in Figure 1, a kind of steam Rankine-low boiling working fluid Rankine Rankine combined cycle generating unit, this device comprises steam Rankine cycle, low boiling working fluid Rankine cycle system, and specific embodiment is as follows:
Low boiling working fluid adopts ammonia water mixture;
Described steam Rankine cycle, refers to by boiler body 1 saturated vapour 2 out, forms superheated vapor 3-1 through the first superheater 3, sends into steam turbine 4 and drives steam-driven generator 21 to generate electricity; Steam turbine 4 exhaust steam 5 out enters condenser/evaporator 10 and forms water of condensation 6, and water of condensation 6 is sent into boiler body 1 through condensate pump 6-1, oxygen-eliminating device 7-1, feed water pump 7, feed water preheater 8, then produced saturated vapour, thus forms steam Rankine cycle circuit.
Described ammonia steam Rankine cycle, refer to that ammoniacal liquor 11 is through recycle pump 12, regenerator 15, condenser/evaporator 10, the lean solution formed returns low boiling working fluid condenser 18 through regenerator 15, the pipeline 19 that backflows, the ammonia steam produced is through exhaust steam regenerator 22, second superheater 9, low boiling working fluid steam turbine 17, the exhaust steam of discharging from low boiling working fluid steam turbine 17 forms ammoniacal liquor 11 through exhaust steam regenerator 22, low boiling working fluid condenser 18, return recycle pump 12, thus form ammonia steam Rankine cycle circuit;
Or ammoniacal liquor 11 is through recycle pump 12, condenser/evaporator 10, the ammonia steam produced enters heat exchanger 13 through the second low boiling working fluid steam pipe line 25, form ammonia superheated vapor 16, enter low boiling working fluid steam turbine 17 to drag ammonia generator 20 and generate electricity, the exhaust steam of discharging from low boiling working fluid steam turbine 17 cools formation ammoniacal liquor 11 through low boiling working fluid condenser 18, enter recycle pump 12 again, thus form ammonia steam Rankine cycle circuit;
Described steam Rankine cycle and ammonia steam Rankine cycle circuit are combined by condenser/evaporator 10, in the Rankine cycle of high efficiente callback steam, the latent heat of vaporization of steam condensation release is used for low-temperature end ammonia steam Rankine cycle generating, and the steam condensation side of described steam Rankine cycle is negative pressure.
The second described superheater 9 adopts the 4-1 that draws gas of steam turbine 4 in steam Rankine cycle as thermal source, and the 4-1 that draws gas cools formation condensed water 26 through the second superheater 9 and returns steam Rankine cycle system.
When described heat exchanger 13 is phase-change heat-exchanger, comprise vaporizer 13-1, condenser 13-2, wherein vaporizer 13-1 is arranged in flue 23, and condenser 13-2 is arranged in outside flue 23, and phase-change working substance adopts water; Flue gas adopts separated type heat exchange mode by the phase-change working substance of phase-change heat-exchanger 13 and condenser/evaporator 10 ammonia steam out: the heat that phase-change working substance absorbs flue gas in vaporizer 13-1 produces saturated vapour, saturated vapour is as the thermal source of ammonia steam, by condenser 13-2 and ammonia steam wall-type heat exchange, form condensation water after cooling and produce steam again by the heat of vaporizer 13-1 absorption flue gas again, thus form the Inner eycle loop of phase-change working substance; Phase-change working substance adopts natural circulation mode; The ammonia steam at condenser/evaporator 10 outlet manifold place is through the condenser 13-2 of the second low boiling working fluid steam pipe line 25, heat exchanger 13, the ammonia steam formed enters low boiling working fluid steam turbine 17 through the second superheater 9, get back to condenser/evaporator 10 through exhaust steam regenerator 22, low boiling working fluid condenser 18, recycle pump 12 again, thus form ammonia steam Rankine cycle circuit.
Be provided with low boiling working fluid vaporizer 14: the exhaust steam that low boiling working fluid vaporizer 14 adopts low boiling working fluid steam turbine 17 to export is as thermal source, the ammonia steam produced is through exhaust steam regenerator 22, second superheater 9, low boiling working fluid steam turbine 17, drag ammonia generator 20 to generate electricity, the exhaust steam that low boiling working fluid steam turbine 17 is discharged cools form ammoniacal liquor 11 through exhaust steam regenerator 22, low boiling working fluid vaporizer 14, low boiling working fluid condenser 18, enter recycle pump 12, low boiling working fluid vaporizer 14 again, thus form ammonia steam Rankine cycle circuit; The lean solution that low boiling working fluid vaporizer 14 produces gets back to low boiling working fluid condenser 18 through the pipeline 27 that backflows, condenser/evaporator 10, regenerator 15, the pipeline 19 that backflows.
Described feed water preheater 8, second superheater 9, condenser/evaporator 10, regenerator 15, heat exchanger 13, low boiling working fluid vaporizer 14, exhaust steam regenerator 22 can arrange one or more respectively, adopt series, parallel or series-parallel connection mode to connect.
The air 30 that gas fan 31 is sent here enters air preheater 32, form hot air 33, enter fuel-burning equipment 34 and participate in burning, the high-temperature flue gas of generation is discharged after reducing temperature through boiler body 1, superheater 2, feed water preheater 8, air preheater 32, vaporizer 13-1.
Described low boiling working fluid condenser 18 conveniently technology is arranged, and adopts water or air etc. as cooling medium.
The heat-exchanging element of aforementioned device mentioned in the present invention can adopt tubulation, fin tube, coiler or spiral groove pipe, or adopts the pipe of other augmentation of heat transfer measures or the hollow cavity heat-exchanging element of other patterns.
While controlling a little higher than flue gas acid dew point temperature of wall surface temperature of vaporizer 13-1 heat exchanger surface, or adopt corrosion-resistant material effectively to alleviate the cold end corrosion of flue gas, can effectively reduce temperature of exhaust fume, avoiding flue gas low-temperature to corrode, high efficiente callback fume afterheat.
Unaccounted equipment and standby system, pipeline, instrument, valve in the present invention, be incubated, there is regulatory function bypass facility etc. adopt known mature technology to carry out supporting.
Be provided with the regulating controller supporting with present system, the known Mature Regulation technology of existing steam Rankine cycle power station, Cheng's cycle power station or gas-steam combined cycle power plant is adopted to carry out supporting, steam Rankine-ammonia steam Rankine combined cycle generating unit energy economy, safety, high thermal efficiency are run, reaches energy-saving and cost-reducing object.
Although the present invention with preferred embodiment openly as above, they are not for limiting the present invention, being anyly familiar with this those skilled in the art, without departing from the spirit and scope of the invention, from ought making various changes or retouch, belong to the protection domain of the present invention equally.What therefore protection scope of the present invention should define with the claim of the application is as the criterion.
Claims (1)
1. steam Rankine-low boiling working fluid Rankine combined cycle generating unit, this device comprises steam Rankine cycle system and low boiling working fluid Rankine cycle system, it is characterized in that:
Described steam Rankine cycle system, refers to by boiler body (1) saturated vapour out (2), forms superheated vapor (3-1) through the first superheater (3), sends into steam turbine (4) and drives steam-driven generator (21) generating; Steam turbine (4) exhaust steam out (5) forms water of condensation (6) through condenser/evaporator (10), through oxygen-eliminating device (7-1), feed water pump (7), feed water preheater (8), boiler body (1), produce saturated vapour again, thus form steam Rankine cycle circuit;
Described low boiling working fluid Rankine cycle system, refer to that liquid refrigerant (11) is through recycle pump (12), condenser/evaporator (10), the low boiling working fluid steam produced enters the second superheater (9) through the first low boiling working fluid steam pipe line (24), form low boiling working fluid superheated vapor (16), enter low boiling working fluid steam turbine (17) and drag low boiling generator (20) generating, the exhaust steam of discharging from low boiling working fluid steam turbine (17) forms liquid refrigerant (11) through low boiling working fluid condenser (18) cooling, enter recycle pump (12) again, thus form low boiling working fluid Rankine cycle circuit, or liquid refrigerant (11) is through recycle pump (12), condenser/evaporator (10), the low boiling working fluid steam that condenser/evaporator (10) outlet manifold goes out is through the second low boiling working fluid steam pipe line (25), condenser (13-2), form low boiling working fluid superheated vapor (16), enter low boiling working fluid steam turbine (17) and drag low boiling generator (20) generating, the exhaust steam of discharging from low boiling working fluid steam turbine (17) forms liquid refrigerant (11) through low boiling working fluid condenser (18) cooling, enter recycle pump (12) again, thus form low boiling working fluid Rankine cycle circuit,
Draw gas (4-1) of described steam turbine (4) forms condensed water (26) through the second superheater (9), returns steam Rankine cycle system; Described steam Rankine cycle and low boiling working fluid Rankine cycle circuit are combined by condenser/evaporator (10), and in the Rankine cycle of high efficiente callback steam, the latent heat of vaporization of steam condensation release is used for low boiling working fluid Rankine cycle generating;
Be provided with low boiling working fluid vaporizer (14), exhaust steam regenerator (22):
Liquid refrigerant (11) is through recycle pump (12), low boiling working fluid vaporizer (14), exhaust steam regenerator (22), first low boiling working fluid steam pipe line (24), second superheater (9), enter low boiling working fluid steam turbine (17) and drag low boiling generator (20) generating, the exhaust steam that low boiling working fluid steam turbine (17) is discharged is through exhaust steam regenerator (22), low boiling working fluid vaporizer (14), low boiling working fluid condenser (18) cooling forms liquid refrigerant (11), enter recycle pump (12) again, low boiling working fluid vaporizer (14), thus form low boiling working fluid Rankine cycle circuit,
Described low boiling working fluid boiling point is at normal atmospheric pressure less than-10 DEG C.
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