CN204572090U - Multistage cascade type steam Rankine combined cycle generating unit - Google Patents
Multistage cascade type steam Rankine combined cycle generating unit Download PDFInfo
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- CN204572090U CN204572090U CN201520131961.6U CN201520131961U CN204572090U CN 204572090 U CN204572090 U CN 204572090U CN 201520131961 U CN201520131961 U CN 201520131961U CN 204572090 U CN204572090 U CN 204572090U
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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
Abstract
The utility model relates to a kind of multistage cascade type steam Rankine combined cycle generating unit, adopt the multistage overlapping mode of the Rankine cycle of high voltage terminal steam, the Rankine cycle of intermediate voltage terminal steam, the Rankine cycle of low voltage terminal steam, the latent heat of vaporization discharged during the steam-condensation of the Rankine cycle of high efficiente callback temperature end steam, the Rankine cycle of intermediate voltage terminal steam generates electricity for Rankine cycle system, the load effectively alleviating conventional vapor Rankine cycle system vapour condenser reaches more than 20% absolute value, adopt system optimization technology, the circulation absolute thermal efficiency of whole system improves and can reach more than 5%.The utility model both can be used for the reducing energy consumption of existing reheat vapor cycle steam Rankine cycle unit, also can be used for the design of new-built unit, construction, and economic, society, environmental benefit are remarkable.
Description
Technical field
The utility model relates to a kind of multistage cascade 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
The purpose of this utility model 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. multistage cascade type steam Rankine combined cycle generating unit, can while the advantage retaining traditional steam Rankine cycle technology, significantly reclaim the latent heat of vaporization of conventional vapor Rankine cycle vapour condenser, the load of traditional Rankine cycle vapour condenser is alleviated by a relatively large margin, when identical generated energy, the absolute amplitude value alleviated can reach 20%, 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 purpose of this utility model is realized by following measures:
A kind of multistage cascade type steam Rankine combined cycle generating unit, this device comprises the Rankine cycle of high voltage terminal steam, the Rankine cycle of intermediate voltage terminal steam, the Rankine cycle of low voltage terminal steam, it is characterized in that:
Described high voltage terminal steam Rankine cycle, refers to by boiler body 1 saturated vapour 2 out, forms high pressure superheated steam 3-1 through high-pressure superheater 3, and feeding high-pressure turbine 4 drags high voltage terminal generator 19 and generates electricity; High-pressure turbine 4 exhaust steam out condenses into water of condensation 6 at high voltage terminal condenser/evaporator 5, water of condensation 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;
Described intermediate voltage terminal steam Rankine cycle, refers to the medium pressure steam produced by high voltage terminal condenser/evaporator 5, presses through hot steam in pressing superheater 15-1 to be formed in warp, sends into medium pressure turbine 4-1 and drags intermediate voltage terminal generator 19-1 generating; Medium pressure turbine 4-1 exhaust steam out condenses into water of condensation at intermediate voltage terminal condenser/evaporator 14, and press feed water pump 7-1 to send into high voltage terminal condenser/evaporator 5 in water of condensation warp, high voltage terminal condenser/evaporator 5 produces steam again, thus forms intermediate voltage terminal steam Rankine cycle circuit;
Described low voltage terminal steam Rankine cycle, refers to by intermediate voltage terminal condenser/evaporator 14 steam out, forms low-pressure superheated steam 16 through low-pressure superheater 15, sends into low-pressure turbine 17 energize low-pressure end generator 19-2 generating; Low-pressure turbine 17 exhaust steam out condenses into low voltage terminal water of condensation 9 at low pressure vapour condenser 18, water of condensation 9 is through condensate pump 10, low-pressure feed heater 11, oxygen-eliminating device 12, low pressure feed water pump 13, send into intermediate voltage terminal condenser/evaporator 14, intermediate voltage terminal condenser/evaporator 14 produces steam again, thus forms low voltage terminal steam Rankine cycle circuit.
Described high voltage terminal generator 19, intermediate voltage terminal generator 19-1, low voltage terminal generator 19-2 can be same generator, or the multiple stage generator adopting the mode such as coaxial, arranged side by side to connect.
The described intermediate voltage terminal steam Rankine cycle between the Rankine cycle of high voltage terminal steam and the Rankine cycle of low voltage terminal steam is one or more levels, reduces overlapping successively with the Rankine cycle of high voltage terminal steam and the Rankine cycle of low voltage terminal steam according to pressure.
High voltage terminal condenser/evaporator 5, the intermediate voltage terminal condenser/evaporator 14 of described high voltage terminal steam Rankine cycle circuit, adopt direct or indirect mode to heat water of condensation in the Rankine cycle of intermediate voltage terminal steam, the Rankine cycle of low voltage terminal steam respectively, the latent heat of vaporization discharged during the steam-condensation of the Rankine cycle of high efficiente callback temperature end steam, the Rankine cycle of intermediate voltage terminal steam generates electricity for steam Rankine cycle.
The high-temperature flue gas that fuel combustion produces enters air through boiler body 1, low-pressure superheater 15, high-pressure superheater 3, middle pressure superheater 15-1, high-pressure feed-water heater 8, low-pressure feed heater 11 after lowering the temperature; Or enter air through boiler body 1, high-pressure superheater 3, low-pressure superheater 15, middle pressure superheater 15-1, high-pressure feed-water heater 8, 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 22, condenser 11-2 is arranged in outside flue, and phase-change working substance adopts water, adopts natural circulation mode.
Be provided with the water charging system supporting with multistage cascade type steam Rankine combined cycle generating unit, the qualified moisturizing through Water Treatment enters oxygen-eliminating device 12 or low pressure vapour condenser 18, the consumption of replenishment system.
Described high-pressure feed-water heater 8, high voltage terminal condenser/evaporator 5, intermediate voltage terminal condenser/evaporator 14, low-pressure feed heater 11, high-pressure superheater 3, low-pressure superheater 15, middle pressure superheater 15-1, low pressure vapour condenser 18 can arrange one or more respectively, adopt series, parallel or series-parallel connection mode to connect.
The air 23 that gas fan 24 is sent here enters air preheater 25, form hot air 26, enter fuel-burning equipment 27 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, middle pressure superheater 15-1, high-pressure feed-water heater 8, air preheater 23, low-pressure feed heater 11.
Described low voltage terminal vapour 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 utility model 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 utility model, be incubated, there is regulatory function bypass facility etc. adopt known mature technology to carry out supporting.
Be provided with and the safety of the utility model system support, 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, multistage cascade 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 multistage cascade type steam Rankine combined cycle generating unit of the utility model design, be different from traditional steam Rankine cycle system or two-stage cascade type steam Rankine cycle unit, contribute to the design optimizing steam Rankine cycle, be equivalent to adopt the Rankine cycle new paragon of novel extraction cycle in conjunction with reheat vapor cycle of at least two-stage, compare the load of the low voltage terminal vapour condenser of the unit of same generated output, the absolute amplitude value that the load of vapour condenser alleviates can reach 20%, and the absolute efficiency value of whole system circulation at least improves more than 3%; Back pressure because of high voltage terminal steam Rankine cycle steam turbine adopts malleation mode to run, high-pressure turbine outlet exhaust steam can ensure certain degree of superheat, when high voltage terminal superheat steam temperature is constant, improve thermal efficiency of cycle more than 2% further by the method suitably improving the first pressing of high voltage terminal steam.
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:
(1) the high-pressure steam turbine operation under positive pressure of high voltage terminal steam Rankine cycle, outlet vapor is superheated vapor, compared to the unit adopting reheat vapor cycle technology, can reduce back pressure further, thus multiple electricity, the operating conditions of steam turbine is optimized; 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, effectively can solve the problem that in conventional vapor Rankine cycle, last stage vane of steam turbine brings because of wet vapor and design, manufactures and operation problem, obviously improve before the vibration comparatively of steam turbine generator set.
(2) the oxygen corrosion Safety performance of high pressure side steam Rankine cycle steam generator system is obviously improved, and alleviates conventional vapor generator set because of the operation of vapour condenser negative pressure, the oxygen corrosion harm that air unavoidably bleeds and causes service system.
4, scheme of the present utility model 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 reheating Rankine cycle unit, the potentiality of the abundant excavating device of energy, vitalize existing assets, meet the industrial policy of country simultaneously, economical, the Security of unit operation obtain Reliable guarantee, effectively can improve the thermal efficiency of system.
Accompanying drawing explanation
Fig. 1 is one of the present utility model multistage cascade type steam Rankine combined cycle generating unit schematic flow sheet.
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-medium pressure turbine, 5-high voltage terminal condenser/evaporator, 6-water of condensation, 7-high pressure water pump, feed water pump is pressed in 7-1-, 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-low pressure feed water pump, 14-intermediate voltage terminal condenser/evaporator, 15-low-pressure superheater, superheater is pressed in 15-1-, 16-low-pressure superheated steam, 16-1-low-pressure saturated steam, 17-low-pressure turbine, 18-low pressure vapour condenser, 19-high voltage terminal generator, 19-1-intermediate voltage terminal generator, 19-2-low voltage terminal generator, 22-flue, 23-air, 24-gas fan, 25-air preheater, 26-hot air, 27-fuel-burning equipment.
Embodiment
Below in conjunction with the drawings and specific embodiments, the utility model is described in further detail.
embodiment 1:
As shown in Figure 1, a kind of multistage cascade type steam Rankine combined cycle cogeneration device, this device comprises the Rankine cycle of high voltage terminal steam, the Rankine cycle of intermediate voltage terminal steam, the Rankine cycle of low voltage terminal steam.Described high voltage terminal steam Rankine cycle, refers to by boiler body 1 saturated vapour 2 out, forms high pressure superheated steam 3-1 through high-pressure superheater 3, and feeding high-pressure turbine 4 drags high voltage terminal generator 19 and generates electricity; High-pressure turbine 4 exhaust steam out condenses into water of condensation 6 at high voltage terminal condenser/evaporator 5, water of condensation 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;
Described intermediate voltage terminal steam Rankine cycle, refers to the medium pressure steam produced by high voltage terminal condenser/evaporator 5, presses through hot steam in pressing superheater 15-1 to be formed in warp, sends into medium pressure turbine 4-1 and drags intermediate voltage terminal generator 19-1 generating; Medium pressure turbine 4-1 exhaust steam out condenses into water of condensation at intermediate voltage terminal condenser/evaporator 14, and press feed water pump 7-1 to send into high voltage terminal condenser/evaporator 5 in water of condensation warp, high voltage terminal condenser/evaporator 5 produces steam again, thus forms intermediate voltage terminal steam Rankine cycle circuit;
Described low voltage terminal steam Rankine cycle, refers to by intermediate voltage terminal condenser/evaporator 14 steam out, forms low-pressure superheated steam 16 through low-pressure superheater 15, sends into low-pressure turbine 17 energize low-pressure end generator 19-2 generating; Low-pressure turbine 17 exhaust steam out condenses into low voltage terminal water of condensation 9 at low pressure vapour condenser 18, water of condensation 9 is through condensate pump 10, low-pressure feed heater 11, oxygen-eliminating device 12, low pressure feed water pump 13, send into intermediate voltage terminal condenser/evaporator 14, intermediate voltage terminal condenser/evaporator 14 produces steam again, thus forms low voltage terminal steam Rankine cycle circuit.
Described high voltage terminal generator 19, intermediate voltage terminal generator 19-1, low voltage terminal generator 19-2 are same generator.
The described intermediate voltage terminal steam Rankine cycle between the Rankine cycle of high voltage terminal steam and the Rankine cycle of low voltage terminal steam, adopts one-level.
High voltage terminal condenser/evaporator 5, the intermediate voltage terminal condenser/evaporator 14 of described high voltage terminal steam Rankine cycle circuit, adopt direct or indirect mode to heat water of condensation in the Rankine cycle of intermediate voltage terminal steam, the Rankine cycle of low voltage terminal steam respectively, the latent heat of vaporization discharged during the steam-condensation of the Rankine cycle of high efficiente callback temperature end steam, the Rankine cycle of intermediate voltage terminal steam generates electricity for steam Rankine cycle.
The high-temperature flue gas that fuel combustion produces enters air through boiler body 1, low-pressure superheater 15, high-pressure superheater 3, middle pressure superheater 15-1, high-pressure feed-water heater 8, low-pressure feed heater 11 after lowering the temperature.
Described low-pressure feed heater 11 adopts separated type heat exchange mode with flue gas, for compound phase change heat exchanger, comprise vaporizer 11-1, condenser 11-2, vaporizer 11-1 is arranged in flue 22, condenser 11-2 is arranged in outside flue, phase-change working substance adopts water, adopts natural circulation mode.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.
Be provided with the water charging system supporting with multistage cascade type steam Rankine combined cycle generating unit, the qualified moisturizing through Water Treatment enters oxygen-eliminating device 12, the consumption of replenishment system.
Described high-pressure feed-water heater 8, high voltage terminal condenser/evaporator 5, intermediate voltage terminal condenser/evaporator 14, low-pressure feed heater 11, high-pressure superheater 3, low-pressure superheater 15, middle pressure superheater 15-1, low pressure vapour condenser 18 can arrange one or more respectively, adopt series, parallel or series-parallel connection mode to connect.
The air 23 that gas fan 24 is sent here enters air preheater 25, form hot air 26, enter fuel-burning equipment 27 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, middle pressure superheater 15-1, high-pressure feed-water heater 8, air preheater 23, low-pressure feed heater 11.
Described low voltage terminal vapour 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 utility model 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 utility model, be incubated, there is regulatory function bypass facility etc. adopt known mature technology to carry out supporting.
Be provided with and the safety of the utility model system support, 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, multistage cascade type steam Rankine combined cycle generating unit energy economy, safety, high thermal efficiency are run, reaches energy-saving and cost-reducing object.
Although the utility model with preferred embodiment openly as above; but they are not for limiting the utility model, being anyly familiar with this those skilled in the art, not departing from the spirit and scope of the utility model; from when making various changes or retouch, belong to the protection domain of the utility model equally.What therefore protection domain of the present utility model should define with the claim of the application is as the criterion.
Claims (8)
1. a multistage cascade type steam Rankine combined cycle generating unit, this device comprises the Rankine cycle of high voltage terminal steam, the Rankine cycle of intermediate 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 out (2), form high pressure superheated steam (3-1) through high-pressure superheater (3), send into high-pressure turbine (4) and drag high voltage terminal generator (19) generating; High-pressure turbine (4) exhaust steam out condenses into water of condensation (6) at high voltage terminal condenser/evaporator (5), water of condensation (6) sends into high-pressure feed-water heater (8), boiler body (1) through high pressure water pump (7), boiler body (1) produces saturated vapour (2) again, thus forms high voltage terminal steam Rankine cycle circuit;
Described intermediate voltage terminal steam Rankine cycle, refer to the medium pressure steam produced by high voltage terminal condenser/evaporator (5), press through hot steam in pressing superheater (15-1) to be formed in warp, send into medium pressure turbine (4-1) and drag intermediate voltage terminal generator (19-1) generating; Medium pressure turbine (4-1) exhaust steam out condenses into water of condensation at intermediate voltage terminal condenser/evaporator (14), feed water pump (7-1) is pressed to send into high voltage terminal condenser/evaporator (5) in water of condensation warp, high voltage terminal condenser/evaporator (5) produces steam again, thus forms intermediate voltage terminal steam Rankine cycle circuit;
Described low voltage terminal steam Rankine cycle, refer to by intermediate voltage terminal condenser/evaporator (14) steam out (16-1), form low-pressure superheated steam (16) through low-pressure superheater (15), send into low-pressure turbine (17) and drag low voltage terminal generator (19-2) generating; Low-pressure turbine (17) exhaust steam out condenses into low voltage terminal water of condensation (9) at low pressure vapour condenser (18), water of condensation (9) is through condensate pump (10), low-pressure feed heater (11), oxygen-eliminating device (12), low pressure feed water pump (13), send into intermediate voltage terminal condenser/evaporator (14), intermediate voltage terminal condenser/evaporator (14) produces steam again, thus forms low voltage terminal steam Rankine cycle circuit.
2. device according to claim 1, is characterized in that:
Described low-pressure feed heater (11) adopts dividing wall type or separated type heat exchange mode with flue gas.
3. device according to claim 2, is characterized in that:
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.
4. device according to claim 1, is characterized in that:
Be provided with air preheater (25): the air (23) that gas fan (24) is sent here becomes hot air (26) through air preheater (25), enters fuel-burning equipment (27).
5. device according to claim 1, is characterized in that:
Described high-pressure superheater (3), low-pressure superheater (15), middle pressure superheater (15-1), high-pressure feed-water heater (8), air preheater (25), low-pressure feed heater (11), high voltage terminal condenser/evaporator (5), intermediate voltage terminal condenser/evaporator (14), low pressure vapour condenser (18) can arrange one or more, adopt series, parallel or series-parallel connection mode to connect.
6. device according to claim 1, is characterized in that:
Described high voltage terminal generator (19), intermediate voltage terminal generator (19-1), low voltage terminal generator (19-2) are same generator, or the multiple stage generator adopting the mode such as coaxial, arranged side by side to connect.
7. device according to claim 1, is characterized in that:
The described intermediate voltage terminal steam Rankine cycle between the Rankine cycle of high voltage terminal steam and the Rankine cycle of low voltage terminal steam is one or more levels, reduces overlapping successively with the Rankine cycle of high voltage terminal steam and the Rankine cycle of low voltage terminal steam according to pressure.
8. device according to claim 1, is characterized in that:
Be provided with the water charging system supporting with multistage cascade type steam Rankine combined cycle generating unit, the qualified moisturizing through Water Treatment enters oxygen-eliminating device (12) or low pressure vapour condenser (18).
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| Application Number | Priority Date | Filing Date | Title |
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| CN201520131961.6U CN204572090U (en) | 2015-03-07 | 2015-03-07 | Multistage cascade type steam Rankine combined cycle generating unit |
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| CN201520131961.6U CN204572090U (en) | 2015-03-07 | 2015-03-07 | Multistage cascade type steam Rankine combined cycle generating unit |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104727870A (en) * | 2015-03-07 | 2015-06-24 | 南京瑞柯徕姆环保科技有限公司 | Multistage cascaded steam Rankine combined cycle power generation device |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104727870A (en) * | 2015-03-07 | 2015-06-24 | 南京瑞柯徕姆环保科技有限公司 | Multistage cascaded steam Rankine combined cycle power generation device |
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