CN103075214B - Extracted steam type steam Rankine combined cycle power generation device - Google Patents
Extracted steam type steam Rankine combined cycle power generation device Download PDFInfo
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- CN103075214B CN103075214B CN201310029369.0A CN201310029369A CN103075214B CN 103075214 B CN103075214 B CN 103075214B CN 201310029369 A CN201310029369 A CN 201310029369A CN 103075214 B CN103075214 B CN 103075214B
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- 238000010248 power generation Methods 0.000 title abstract description 4
- 238000009834 vaporization Methods 0.000 claims abstract description 8
- 230000008016 vaporization Effects 0.000 claims abstract description 8
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 76
- 239000007789 gas Substances 0.000 claims description 29
- 239000003546 flue gas Substances 0.000 claims description 27
- UGFAIRIUMAVXCW-UHFFFAOYSA-N Carbon monoxide Chemical compound [O+]#[C-] UGFAIRIUMAVXCW-UHFFFAOYSA-N 0.000 claims description 26
- 229920006395 saturated elastomer Polymers 0.000 claims description 26
- 238000009833 condensation Methods 0.000 claims description 23
- 230000005494 condensation Effects 0.000 claims description 22
- 239000006200 vaporizer Substances 0.000 claims description 21
- 238000010438 heat treatment Methods 0.000 claims description 13
- 239000000126 substance Substances 0.000 claims description 13
- 238000011084 recovery Methods 0.000 claims description 9
- 230000005611 electricity Effects 0.000 claims description 8
- 239000003517 fume Substances 0.000 claims description 8
- 238000000034 method Methods 0.000 claims description 8
- 238000001816 cooling Methods 0.000 claims description 7
- 125000004122 cyclic group Chemical group 0.000 claims description 3
- 230000020169 heat generation Effects 0.000 claims description 3
- 238000010521 absorption reaction Methods 0.000 claims 1
- 238000006392 deoxygenation reaction Methods 0.000 claims 1
- 238000005516 engineering process Methods 0.000 abstract description 16
- 238000000605 extraction Methods 0.000 abstract description 2
- 238000005457 optimization Methods 0.000 abstract description 2
- 230000009466 transformation Effects 0.000 abstract 1
- 239000000463 material Substances 0.000 description 5
- 238000005260 corrosion Methods 0.000 description 4
- 230000007797 corrosion Effects 0.000 description 4
- 239000002918 waste heat Substances 0.000 description 4
- 238000013461 design Methods 0.000 description 3
- 238000001704 evaporation Methods 0.000 description 3
- 230000008020 evaporation Effects 0.000 description 3
- 239000002253 acid Substances 0.000 description 2
- 230000003416 augmentation Effects 0.000 description 2
- 230000033228 biological regulation Effects 0.000 description 2
- 238000002485 combustion reaction Methods 0.000 description 2
- 150000001875 compounds Chemical class 0.000 description 2
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- 238000012546 transfer Methods 0.000 description 2
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- 238000010276 construction Methods 0.000 description 1
- 238000006477 desulfuration reaction Methods 0.000 description 1
- 238000006073 displacement reaction Methods 0.000 description 1
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- 238000011160 research Methods 0.000 description 1
- 238000010977 unit operation Methods 0.000 description 1
- 238000003809 water extraction Methods 0.000 description 1
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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]
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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
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P10/00—Technologies related to metal processing
- Y02P10/25—Process efficiency
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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
- 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 an extracted steam type steam Rankine combined cycle power generation device. The extracted steam of a steam turbine in high-pressure-end steam Rankine cycle is used as a heat source of a steam generator in a low-pressure-end steam Rankine cycle; the high-pressure-end steam Rankine cycle and the low-pressure-end steam Rankine cycle are directly compounded; vaporization latent heat, released when the extracted steam of the steam turbine in the high-pressure-end steam Rankine cycle is condensed, is completely used for the low-pressure-end steam Rankine cycle for generating power; the load of a traditional steam Rankine cycle system condenser can be effectively reduced by above 30%; and according to a system optimization technology, the cycle absolute thermal efficiency of the whole system can be improved by above 4%. The extracted steam type steam Rankine combined cycle power generation device disclosed by the invention can be used for the energy saving transformation of a traditional extraction condensing type or pure condensing type unit, also can be used for designing and constructing a newly-built unit and has an obvious economic, social and environmentally-friendly benefit.
Description
Technical field
The present invention relates to a kind of steam-extracting type steam 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, reheat vapor cycle etc., Rankine cycle has become the basic circulation of modern vapor power plant.
Modern big-and-middle-sized steam power plant all adopts heated feed water extraction cycle, the steam reheat vapor cycle technology of drawing gas without any exception, thus improve heating mean temperature, except considerably improving thermal efficiency of cycle, though specific steam consumption increases to some extent, but make steam discharge rate reduce owing to drawing gas step by step, 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, often larger 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.
Therefore the thermomechanics basic law in steam Rankine cycle thermal power plant how is utilized, 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 the steam Rankine-cycle power system 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 Problems existing, a kind of new thermal power plant's combined cycle flow process is proposed, i.e. steam-extracting type steam Rankine combined cycle generating unit, can while retaining traditional steam Rankine cycle reheat vapor cycle technological merit, significantly reclaim the latent heat of vaporization of drawing gas, the load of traditional Rankine cycle vapour condenser is significantly alleviated, according to the size of rate of air sucked in required, the absolute amplitude value alleviated can reach 10%, 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-extracting type steam Rankine combined cycle generating unit, this device comprises the Rankine cycle of high voltage terminal steam, the Rankine cycle of low voltage terminal steam, it is characterized in that:
Described high voltage terminal steam Rankine cycle, refer to by boiler body 1 saturated vapour 2 out, high pressure superheated steam 3-1 is formed through high-pressure superheater 3, send into high-pressure turbine 4 drive electrical generators 19 to generate electricity, high-pressure turbine 4 exhaust steam out forms water of condensation 6 in vapour condenser 5, condensed water 6 sends into high-pressure feed-water heater 8, boiler body 1 through condensate pump 13, oxygen-eliminating device 12, high pressure water pump 7, and boiler body 1 produces saturated vapour again, thus forms high voltage terminal steam Rankine cycle circuit.
Described low voltage terminal steam Rankine cycle, refer to that steam generator 26 adopts the 4-1 that draws gas of steam turbine 4 in the Rankine cycle of high voltage terminal steam as thermal source, to feed water direct Hybrid Heating or indirect heat exchange with low voltage terminal, produce low-pressure saturated steam 5-1, the condensed water that the 4-1 that draws gas is formed through steam generator 26 returns high voltage terminal steam Rankine cycle system through return piping 27, form low-pressure superheated steam 16 through low-pressure superheater 15, send into low-pressure turbine 17 drive electrical generators 19 and generate electricity; Low-pressure turbine 17 exhaust steam out condenses into water of condensation 9 at low pressure vapour condenser 18, water of condensation 9 is through condensate pump 10, low-pressure feed heater 11, secondary low-pressure feed heater 14, send into steam generator 26, steam generator 26 produces saturated vapour 5-1 again, thus forms low voltage terminal steam Rankine cycle circuit.
Described steam generator 26 adopts operation under positive pressure mode.
Described high voltage terminal steam Rankine cycle and the Rankine cycle of low voltage terminal steam are got up by steam generator 26 direct combination, draw gas in the Rankine cycle of high efficiente callback temperature end steam 4-1 condensation time the latent heat of vaporization that discharges generate electricity for the Rankine cycle of low-temperature end steam, the low-pressure superheater technology adopted, receive the advantage of reheat vapor cycle technology, therefore can significantly improve the thermal efficiency of whole circulation.
The high-temperature flue gas that fuel combustion produces enters air through boiler body 1, low-pressure superheater 15, high-pressure superheater 3, high-pressure feed-water heater 8, secondary low-pressure feed heater 14, low-pressure feed heater 11 after lowering the temperature; Or enter air through boiler body 1, high-pressure superheater 3, low-pressure superheater 15, high-pressure feed-water heater 8, secondary low-pressure feed heater 14, low-pressure feed heater 11 after lowering the temperature.
Feedwater in described evaporation generator 26 and the 4-1 that draws gas adopt direct Hybrid Heating or indirect gradually hot mode.
When feedwater in described evaporation generator 26 adopts direct Hybrid Heating mode with the 4-1 that draws gas, be provided with recovery line 27: the condensed water that the 4-1 that draws gas is formed through steam generator 26 directly returns high voltage terminal steam Rankine cycle system from steam generator 26 through return piping 27; Or return high voltage terminal steam Rankine cycle circuit from condensate pump 10 outlet line through recovery line 27.
When feedwater in described evaporation generator 26 adopts indirect heating manner with the 4-1 that draws gas, be provided with recovery line 27: the condensed water that the 4-1 that draws gas is formed through steam generator 26 directly returns high voltage terminal steam Rankine cycle system from steam generator 26 through return piping 27; Water of condensation 9 returns high voltage terminal steam Rankine cycle circuit through condensate pump 10, recovery line 27, then gets back to the inlet line of condensate pump 10 through return piping 27-1 from oxygen-eliminating device 12 outlet line.
When described low-pressure feed heater 11 and flue gas adopt separated type heat exchange mode, low-pressure feed heater is compound phase change heat exchanger, comprises vaporizer 11-1, condenser 11-2, vaporizer 11-1 and condenser employing is split type or the structure of integral type; Phase-change working substance wherein adopts water or other suitable materials; The heat that phase-change working substance absorbs flue gas in vaporizer 11-1 produces saturated vapour, saturated vapour is by condenser 11-2 and low voltage terminal water of condensation 9 wall-type heat exchange, form condensation water is absorbed flue gas again heat generation steam by vaporizer 11-1 after cooling, thus form the inner cyclic process of phase-change working substance; Phase-change working substance adopts natural circulation or pump circulation mode; Preferred method is vaporizer, the split type layout of condenser, and namely vaporizer 11-1 is arranged in flue 20, condenser 11-2 is arranged in outside flue, and phase-change working substance adopts water, adopts natural circulation mode.
Described high-pressure feed-water heater 8, steam vaporizer 26, low-pressure feed heater 14, low-pressure feed heater 11, high-pressure superheater 3, low-pressure superheater 15 can arrange one or more respectively, adopt series, parallel or series-parallel connection mode to connect.
The air 21 that gas fan 22 is sent here enters air preheater 23, form hot air 24, enter fuel-burning equipment 25 and participate in burning, the high-temperature flue gas of generation is discharged after reducing temperature through boiler body 1, low-pressure superheater 15, high-pressure superheater 3, high-pressure feed-water heater 8, secondary low-pressure feed heater 14, air preheater 23, low-pressure feed heater 11.
Described vapour condenser 18, vapour condenser 5 conveniently technology are arranged, and adopt 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.
Control a little higher than flue gas acid dew point temperature of wall surface temperature of the vaporizer 11-1 heat exchanger surface of low-pressure feed heater 11, or adopt corrosion-resistant material effectively to alleviate the cold end corrosion of flue gas, can effectively reduce temperature of exhaust fume, avoid flue gas low-temperature corrode while, 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 safety supporting with present system, regulating controller, 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-extracting type steam 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, the steam-extracting type steam Rankine combined cycle generating unit of the present invention's design, be different from traditional steam Rankine cycle system, high-pressure turbine drawn gas as the thermal source of the steam generator of low voltage terminal steam Rankine cycle, directly with the feedwater mixing of low voltage terminal steam Rankine cycle or the feedwater of indirect heating low voltage terminal steam Rankine cycle, produce low pressure steam, thus the Rankine cycle of high voltage terminal steam and the Rankine cycle of low voltage terminal steam are combined by steam generator is ingenious, the latent heat of vaporization that the Rankine cycle of high voltage terminal steam is drawn gas all is utilized effectively, the absolute amplitude value that the load of vapour condenser alleviates can reach 10%, the absolute efficiency value of whole system circulation can improve more than 2%, adopt system optimization technology, the absolute amplitude value that the efficiency of combined cycle system improves can reach more than 4%.
2, the fume afterheat of power plant realizes high efficiente callback 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 Rankine cycle system efficiency power generation, more meets cascaded utilization of energy principle.
3, safety in operation significantly improves:
The high-pressure steam turbine displacement of high voltage terminal steam Rankine cycle significantly reduces, the operating conditions of steam turbine last stage blade be improved significantly; Low-pressure superheater in the Rankine cycle of low voltage terminal steam, because pressure is lower, safety in operation improves, the admission of low-pressure turbine adopts superheated vapor, the advantage of traditional reheat vapor cycle is not fully exerted, effectively can solve the problem that in conventional vapor Rankine cycle, last stage vane of steam turbine brings because of wet vapor to design, manufacture and operation problem, obviously improve before the vibration comparatively of steam turbine generator set.
4, the solution of the present invention both can be used for design, the construction of newly-built power plant system, also can be used for the reducing energy consumption to existing Rankine cycle sucking condensing type or pure condensate formula unit or back pressure unit, the potentiality of the abundant excavating device of energy, vitalize existing assets, traditional condensed steam type of closing down or sucking condensing type unit can be made again to radiate vigour, meet the industrial policy of country, economical, the Security of unit operation obtain Reliable guarantee, effectively can improve the thermal efficiency of system simultaneously.
Accompanying drawing explanation
Fig. 1 is a kind of steam-extracting type steam Rankine combined cycle generating unit schematic flow sheet of the present invention.
In Fig. 1: 1-boiler body, 2-saturated vapour, 3-high-pressure superheater, 3-1-high pressure superheated steam, 4-high-pressure turbine, 4-1-high-pressure turbine draws gas, 5-vapour condenser, 5-1-low-pressure saturated steam, 6-condensed water, 7-high pressure water pump, 8-high-pressure feed-water heater, 9-low pressure condensate water, 10-condensate pump, 11-low-pressure feed heater, 11-1-vaporizer, 11-2-condenser, 12-oxygen-eliminating device, 13-condensate pump, 14-secondary low-pressure feed heater, 15-low-pressure superheater, 16-low-pressure superheated steam, 17-low-pressure turbine, 18-vapour condenser, 19-generator, 20-flue, 21-air, 22-gas fan, 23-air preheater, 24-hot air, 25-fuel-burning equipment, 26-steam generator, 27-return piping, 27-1-return piping.
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-extracting type steam Rankine combined cycle generating unit, this device comprises the Rankine cycle of high voltage terminal steam, the Rankine cycle of low voltage terminal steam:
Described high voltage terminal steam Rankine cycle, refer to by boiler body 1 saturated vapour 2 out, high pressure superheated steam 3-1 is formed through high-pressure superheater 3, send into high-pressure turbine 4 drive electrical generators 19 to generate electricity, high-pressure turbine 4 exhaust steam out forms water of condensation 6 in vapour condenser 5, condensed water 6 sends into high-pressure feed-water heater 8, boiler body 1 through condensate pump 13, oxygen-eliminating device 12, high pressure water pump 7, and boiler body 1 produces saturated vapour again, thus forms high voltage terminal steam Rankine cycle circuit.
Described low voltage terminal steam Rankine cycle, refer to that steam generator 26 adopts the 4-1 that draws gas of steam turbine 4 in the Rankine cycle of high voltage terminal steam as thermal source, to feed water direct Hybrid Heating with low voltage terminal, produce low-pressure saturated steam 5-1, the condensed water that the 4-1 that draws gas is formed through steam generator 26 returns high voltage terminal steam Rankine cycle system through return piping 27, form low-pressure superheated steam 16 through low-pressure superheater 15, send into low-pressure turbine 17 drive electrical generators 19 and generate electricity; Low-pressure turbine 17 exhaust steam out condenses into water of condensation 9 at low pressure vapour condenser 18, water of condensation 9 is through condensate pump 10, low-pressure feed heater 11, secondary low-pressure feed heater 14, send into steam generator 26, steam generator 26 produces saturated vapour 5-1 again, thus forms low voltage terminal steam Rankine cycle circuit.
Described high voltage terminal steam Rankine cycle and the Rankine cycle of low voltage terminal steam are got up by steam generator 26 direct combination, draw gas in the Rankine cycle of high efficiente callback temperature end steam 4-1 condensation time the latent heat of vaporization that discharges generate electricity for the Rankine cycle of low-temperature end steam, the low-pressure superheater technology adopted, receive the advantage of reheat vapor cycle technology, therefore can significantly improve the thermal efficiency of whole circulation.
The high-temperature flue gas that fuel combustion produces enters air through boiler body 1, low-pressure superheater 15, high-pressure superheater 3, high-pressure feed-water heater 8, secondary low-pressure feed heater 14, low-pressure feed heater 11 after lowering the temperature; Or enter air through boiler body 1, high-pressure superheater 3, low-pressure superheater 15, high-pressure feed-water heater 8, secondary low-pressure feed heater 14, low-pressure feed heater 11 after lowering the temperature.
When described low-pressure feed heater 11 and flue gas adopt separated type heat exchange mode, low-pressure feed heater is compound phase change heat exchanger, comprises vaporizer 11-1, condenser 11-2, vaporizer 11-1 and condenser employing is split type or the structure of integral type; Phase-change working substance wherein adopts water or other suitable materials; The heat that phase-change working substance absorbs flue gas in vaporizer 11-1 produces saturated vapour, saturated vapour is by condenser 11-2 and low voltage terminal water of condensation 9 wall-type heat exchange, form condensation water is absorbed flue gas again heat generation steam by vaporizer 11-1 after cooling, thus form the inner cyclic process of phase-change working substance; Phase-change working substance adopts natural circulation or pump circulation mode; Preferred method is vaporizer, the split type layout of condenser, and namely vaporizer 11-1 is arranged in flue 20, condenser 11-2 is arranged in outside flue, and phase-change working substance adopts water, adopts natural circulation mode.
Described high-pressure feed-water heater 8, steam vaporizer 26, low-pressure feed heater 14, low-pressure feed heater 11, high-pressure superheater 3, low-pressure superheater 15 can arrange one or more respectively, adopt series, parallel or series-parallel connection mode to connect.
The air 21 that gas fan 22 is sent here enters air preheater 23, form hot air 24, enter fuel-burning equipment 25 and participate in burning, the high-temperature flue gas of generation is discharged after reducing temperature through boiler body 1, low-pressure superheater 15, high-pressure superheater 3, high-pressure feed-water heater 8, secondary low-pressure feed heater 14, air preheater 23, low-pressure feed heater 11.
Described vapour condenser 18, vapour condenser 5 conveniently technology are arranged, and adopt 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.
Control a little higher than flue gas acid dew point temperature of wall surface temperature of the vaporizer 11-1 heat exchanger surface of low-pressure feed heater 11, or adopt corrosion-resistant material effectively to alleviate the cold end corrosion of flue gas, can effectively reduce temperature of exhaust fume, avoid flue gas low-temperature corrode while, 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 safety supporting with present system, regulating controller, 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-extracting type 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 (12)
1. a steam-extracting type steam Rankine combined cycle generating unit, this device comprises the Rankine cycle of high voltage terminal steam and low voltage terminal steam Rankine cycle system, it is characterized in that:
Described high voltage terminal steam Rankine cycle, refer to by boiler body (1) saturated vapour out (2), high pressure superheated steam (3-1) is formed through high-pressure superheater (3), send into high-pressure turbine (4) drive electrical generators (19) generating, high-pressure turbine (4) exhaust steam out forms condensed water (6) in vapour condenser (5), described condensed water (6) sends into boiler body (1) through high pressure water pump (7), boiler body (1) produces saturated vapour again, thus forms high voltage terminal steam Rankine cycle circuit;
Described low voltage terminal steam Rankine cycle, refer to that steam generator (26) adopts draw gas (4-1) of steam turbine (4) in the Rankine cycle of high voltage terminal steam as thermal source, the feedwater of heating low voltage terminal steam Rankine cycle, the low-pressure saturated steam (5-1) that steam generator (26) produces, form low-pressure superheated steam (16) through low-pressure superheater (15), send into low-pressure turbine (17) drive electrical generators (19) generating; Low-pressure turbine (17) exhaust steam out condenses into water of condensation (9) at vapour condenser (18), water of condensation (9) sends into steam generator (26) through condensate pump (10), steam generator (26) produces saturated vapour (5-1) again, thus forms low voltage terminal steam Rankine cycle circuit;
Described steam generator (26) adopts operation under positive pressure mode;
Described high voltage terminal steam Rankine cycle and the Rankine cycle of low voltage terminal steam are got up by steam generator (26) direct combination, and the latent heat of vaporization discharged when reclaiming the steam-condensation of temperature end steam Rankine cycle generates electricity for the Rankine cycle of low-temperature end steam.
2. device according to claim 1, is characterized in that:
Be provided with high-pressure feed-water heater (8):
Boiler body (1) saturated vapour out (2), forms high pressure superheated steam (3-1) through high-pressure superheater (3), sends into high-pressure turbine (4) drive electrical generators (19) generating; High-pressure turbine (4) exhaust steam out (4-1) forms condensed water (6) through vapour condenser (5), condensed water (6) sends into high-pressure feed-water heater (8), boiler body (1) through high pressure water pump (7), boiler body (1) produces saturated vapour again, thus forms high voltage terminal steam Rankine cycle circuit.
3. device according to claim 1, is characterized in that:
Be provided with oxygen-eliminating device (12):
Boiler body (1) saturated vapour out (2), forms high pressure superheated steam (3-1) through high-pressure superheater (3), sends into high-pressure turbine (4) drive electrical generators (19) generating; High-pressure turbine (4) exhaust steam out (4-1) forms condensed water (6) through vapour condenser (5), condensed water (6) is after condensate pump (13), oxygen-eliminating device (12) deoxygenation, boiler body (1) is sent into through high pressure water pump (7), boiler body (1) produces saturated vapour again, thus forms high voltage terminal steam Rankine cycle circuit.
4. device according to claim 1, is characterized in that:
Feedwater in described steam generator (26) and draw gas (4-1) adopt direct Hybrid Heating or indirect gradually hot mode.
5. device according to claim 4, is characterized in that:
When feedwater in described steam generator (26) adopts direct Hybrid Heating mode with draw gas (4-1), be provided with recovery line (27): the condensed water that draw gas (4-1) is formed through steam generator (26) directly returns high voltage terminal steam Rankine cycle system from steam generator (26) through return piping (27); Or return high voltage terminal steam Rankine cycle circuit from condensate pump (10) outlet line through recovery line (27).
6. device according to claim 4, is characterized in that:
When feedwater in described steam generator (26) adopts indirect heating manner with draw gas (4-1), be provided with recovery line (27): the condensed water that draw gas (4-1) is formed through steam generator (26) directly returns high voltage terminal steam Rankine cycle system from steam generator (26) through return piping (27); Water of condensation (9) returns high voltage terminal steam Rankine cycle circuit through condensate pump (10), recovery line (27), then gets back to the inlet line of condensate pump (10) through return piping (27-1) from oxygen-eliminating device (12) outlet line.
7. device according to claim 1, is characterized in that:
Be provided with low-pressure feed heater (11):
The saturated vapour (5-1) produced by steam generator (26), form low-pressure superheated steam (16) through low-pressure superheater (15), send into low-pressure turbine (17) drive electrical generators (19) generating; Low-pressure turbine (17) exhaust steam out condenses into water of condensation (9) at vapour condenser (18), water of condensation (9) sends into steam generator (26) through condensate pump (10), low-pressure feed heater (11), after (4-1) heating of drawing gas of high-pressure turbine (4), produce saturated vapour (5-1), thus form low voltage terminal steam Rankine cycle circuit.
8. device according to claim 7, is characterized in that:
Be provided with secondary low-pressure feed heater (14):
The saturated vapour (5-1) produced by steam generator (26), form low-pressure superheated steam (16) through low-pressure superheater (15), send into low-pressure turbine (17) drive electrical generators (19) generating; Low-pressure turbine (17) exhaust steam out condenses into water of condensation (9) at vapour condenser (18), water of condensation (9) sends into steam generator (26) through condensate pump (10), low-pressure feed heater (11), secondary low-pressure feed heater (14), after (4-1) heating of drawing gas of high-pressure turbine (4), produce saturated vapour (5-1), thus form low voltage terminal steam Rankine cycle circuit.
9. device according to claim 7, is characterized in that:
Described low-pressure feed heater (11) adopts dividing wall type or separated type heat exchange mode with flue gas.
10. device according to claim 9, is characterized in that:
When described low-pressure feed heater (11) and flue gas adopt separated type heat exchange mode, comprise vaporizer (11-1), condenser (11-2); Vaporizer (11-1) is arranged in fume side, by phase-change working substance with flue gas wall-type heat exchange, phase-change working substance heat absorption produces steam, steam is by the feedwater wall-type heat exchange of condenser (11-2) with the Rankine cycle of low voltage terminal steam, form condensation water is absorbed flue gas again heat generation steam by vaporizer (11-1) after cooling, thus form the inner cyclic process of phase-change working substance.
11., according to the device one of claim 1 to 10 Suo Shu, is characterized in that:
Be provided with air preheater (23): the air (21) that gas fan (22) is sent here becomes hot air (24) through air preheater (23), enters fuel-burning equipment (25);
Flue gas through boiler body (1), low-pressure superheater (15), high-pressure superheater (3) or and high-pressure feed-water heater (8) or and secondary low-pressure feed heater (14), air preheater (23) or and low-pressure feed heater (11) cooling after discharge;
Or flue gas through boiler body (1), high-pressure superheater (3), low-pressure superheater (15) or and high-pressure feed-water heater (8) or and secondary low-pressure feed heater (14), air preheater (23) or and low-pressure feed heater (11) cooling after discharge;
Or flue gas through boiler body (1), low-pressure superheater (15), high-pressure superheater (3) or and high-pressure feed-water heater (8) or and secondary low-pressure feed heater (14) or and low-pressure feed heater (11), air preheater (23) cooling after discharge;
Or flue gas through boiler body (1), high-pressure superheater (3), low-pressure superheater (15) or and high-pressure feed-water heater (8) or and secondary low-pressure feed heater (14) or and low-pressure feed heater (11), air preheater (23) cooling after discharge.
12. devices according to claim 11, is characterized in that:
Described high-pressure superheater (3), low-pressure superheater (15), high-pressure feed-water heater (8), air preheater (23), secondary low-pressure feed heater (14), low-pressure feed heater (11), steam generator (26) can arrange one or more, adopt series, parallel or series-parallel connection mode to connect.
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| FI90912C (en) * | 1993-02-19 | 1994-04-11 | Imatran Voima Oy | Method in small power plant operation |
| JP3532495B2 (en) * | 2000-04-27 | 2004-05-31 | 清 宮本 | Reburning combined cycle mixed gas turbine |
| FI111182B (en) * | 2000-12-29 | 2003-06-13 | Fortum Oyj | Connection structure between boiler and steam turbine and method for preheating steam turbine feed water and regulating it |
| JP2002371807A (en) * | 2001-06-15 | 2002-12-26 | Mitsubishi Heavy Ind Ltd | Turbine equipment and steam converting device |
| DE50207526D1 (en) * | 2001-10-01 | 2006-08-24 | Alstom Technology Ltd | METHOD AND DEVICE FOR ACCESSING EMISSION-FREE GAS TURBINE POWER PLANTS |
| US20100263605A1 (en) * | 2009-04-17 | 2010-10-21 | Ajit Singh Sengar | Method and system for operating a steam generation facility |
| CN101614139A (en) * | 2009-07-31 | 2009-12-30 | 王世英 | Multicycle power generation thermodynamic system |
| CN101832158A (en) * | 2010-03-17 | 2010-09-15 | 昆明理工大学 | Steam-organic Rankine cascade power cycle generating system and method |
| CN201851174U (en) * | 2010-04-29 | 2011-06-01 | 中国电力工程顾问集团华东电力设计院 | Heat regenerative type steam-driven induced draft fan system and heating power circulation system of power plant |
| US9316122B2 (en) * | 2010-12-20 | 2016-04-19 | Invensys Systems, Inc. | Feedwater heater control system for improved Rankine cycle power plant efficiency |
| CN202645658U (en) * | 2012-07-04 | 2013-01-02 | 河北联合大学 | Fuel-steam-organic working medium combined cycle power generation unit |
| CN203097973U (en) * | 2013-01-27 | 2013-07-31 | 南京瑞柯徕姆环保科技有限公司 | Steam extraction type steam Rankine combined cycle power generation device |
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