CN103089355B - Steam Rankine-low boiling working fluid Rankine combined cycle generating unit - Google Patents
Steam Rankine-low boiling working fluid Rankine combined cycle generating unit Download PDFInfo
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- CN103089355B CN103089355B CN201310029384.5A CN201310029384A CN103089355B CN 103089355 B CN103089355 B CN 103089355B CN 201310029384 A CN201310029384 A CN 201310029384A CN 103089355 B CN103089355 B CN 103089355B
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01K—STEAM ENGINE PLANTS; STEAM ACCUMULATORS; ENGINE PLANTS NOT OTHERWISE PROVIDED FOR; ENGINES USING SPECIAL WORKING FLUIDS OR CYCLES
- F01K23/00—Plants characterised by more than one engine delivering power external to the plant, the engines being driven by different fluids
- F01K23/02—Plants characterised by more than one engine delivering power external to the plant, the engines being driven by different fluids the engine cycles being thermally coupled
- F01K23/04—Plants characterised by more than one engine delivering power external to the plant, the engines being driven by different fluids the engine cycles being thermally coupled condensation heat from one cycle heating the fluid in another cycle
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01K—STEAM ENGINE PLANTS; STEAM ACCUMULATORS; ENGINE PLANTS NOT OTHERWISE PROVIDED FOR; ENGINES USING SPECIAL WORKING FLUIDS OR CYCLES
- F01K25/00—Plants or engines characterised by use of special working fluids, not otherwise provided for; Plants operating in closed cycles and not otherwise provided for
- F01K25/08—Plants or engines characterised by use of special working fluids, not otherwise provided for; Plants operating in closed cycles and not otherwise provided for using special vapours
- F01K25/10—Plants or engines characterised by use of special working fluids, not otherwise provided for; Plants operating in closed cycles and not otherwise provided for using special vapours the vapours being cold, e.g. ammonia, carbon dioxide, ether
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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
- 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 present invention relates to a kind of steam Rankine-low boiling working fluid Rankine combined cycle generating unit, by low boiling working fluid as the steam in the low boiling working fluid cooling steam Rankine cycle in the Rankine cycle of ammonia ammonia steam, in recovered steam Rankine cycle, the latent heat of vaporization of steam is used for low boiling working fluid Rankine cycle generating, thus steam Rankine-low boiling working fluid Rankine cycle is combined with each other, solve the safety difficulties of low boiling working fluid Rankine cycle Mist heat recovering simultaneously, effective reduction temperature of exhaust fume also avoids the cold end corrosion of flue gas, the waste gas of steam Rankine cycle system, waste water, waste vapour waste heat can obtain effective recycling.The present invention both can be used for the reducing energy consumption of existing unit, also can be used for the design of new-built unit, construction, was particularly suitable for newly-built, the enlarging in the area such as water-deficient area, short of electricity, reconstruction generator set, and economic, society, environmental benefit are remarkable.
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.Also need in station boiler running to ensure that the water quality of boiler meets demand for security by continuous blowdown and periodical blowdown, the oxygen in boiler feed water must be removed, to avoid the corrosion to steam generator system simultaneously.Current thermal deaerator is the one preferred technique of station boiler, and oxygen-eliminating device, while work, is carried a large amount of working steams secretly and entered air.Owing to containing a large amount of heats and excellent water quality in boiler platoon water and deaerator exhaust, if directly discharge will cause the great energy and the wasting of resources, and to environment.Although the waste of these two-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) waste heat of reclaimer three part, often makes larger change to the original thermodynamic system of boiler, has 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 the shortcoming solving the existence of the technology such as above-mentioned steam Rankine cycle and the circulation of card Linne, a kind of steam Rankine-low boiling working fluid Rankine combined cycle generating unit is proposed, traditional steam Rankine cycle unit can be substituted, the difficult problem that a large amount of latent heat of vaporization discharged when simultaneously solving steam condensation in the key issue of low boiling working fluid Rankine cycle unit safety operation and vapour condenser reclaims, adopt vapour condenser operation under positive pressure mode, the latent heat of vaporization in recovered steam Rankine cycle during steam condensation 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 the first steam turbine 4 and drives steam-driven generator 21 to generate electricity; The exhaust steam 5 out of first steam turbine 4 forms water of condensation 6 through the second superheater 9, condenser/evaporator 10, and water of condensation 6 through feed water pump 7, feed water preheater 8, boiler body 1, then produces saturated vapour, thus forms steam Rankine cycle circuit.
Described low boiling working fluid Rankine cycle, refer to that liquid refrigerant 11 sends into condenser/evaporator 10, cooling evaporator 13, first vaporizer 14 respectively or successively through recycle pump 12, the low boiling working fluid steam produced forms low boiling working fluid superheated vapor 16 through the second superheater 9, enter the second steam turbine 17 again, drawing generator 20 generates electricity, the exhaust steam of discharging from the second steam turbine 17 cools formation liquid refrigerant 11 through the first condenser 18, enter recycle pump 12 again, thus form low boiling working fluid Rankine cycle circuit.
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 liquid refrigerant adopts Multi component, liquid refrigerant 11 through recycle pump 12 or and regenerator 15 successively or respectively send into condenser/evaporator 10, cooling evaporator 13, first vaporizer 14, the lean solution formed returns the first condenser 18 through regenerator 15, the pipeline 19 that backflows, the low boiling working fluid steam produced forms liquid refrigerant 11 through the second superheater 9, second steam turbine 17, first vaporizer 14, first condenser 18, return recycle pump 12, thus form low boiling working fluid Rankine cycle circuit.
The pressure of the exhaust steam 5 that the first described steam turbine 4 is discharged is higher than atmospheric pressure.
Described steam Rankine cycle circuit and low boiling working fluid Rankine cycle circuit by the second superheater 9, condenser/evaporator 10 or and cooling evaporator 13 or and the first vaporizer 14, by the Rankine cycle of temperature end steam together with low-temperature end low boiling working fluid Rankine cycle organic composite, the latent heat of vaporization discharged during the steam-condensation of high efficiente callback temperature end steam Rankine cycle generates electricity for the Rankine cycle of low-temperature end low boiling working fluid.
Heat transferring medium liquid refrigerant 11 and the flue gas of described cooling evaporator 13 adopt separated type heat exchange mode, cooling evaporator 13 comprises the second vaporizer 13-1, the second condenser 13-2, wherein the second vaporizer 13-1 is arranged in flue 23, second condenser 13-2 is arranged in outside flue 23, and phase-change working substance wherein adopts water or other suitable materials; The heat that phase-change working substance absorbs flue gas in the second vaporizer 13-1 produces saturated vapour, saturated vapour is as the thermal source of liquid refrigerant 11, by the second condenser 13-2 and liquid refrigerant 11 wall-type heat exchange, form condensation water after cooling and produce steam again by the heat of the second 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 being provided with the generation of exhaust steam regenerator 22: the first vaporizer 14 gets back to the first vaporizer 14 through exhaust steam regenerator 22, second superheater 9, second steam turbine 17, exhaust steam regenerator 22, first vaporizer 14, first condenser 18, recycle pump 12, thus forms low boiling working fluid Rankine cycle circuit.
Be provided with the makeup Water System supporting with steam Rankine cycle system: the distilled water 24 in distilled water tank 25, after small pump 26, normal temp. deaerator 27 deoxygenation, mixed bed 28 desalination, fill into steam Rankine cycle system.
Described feed water preheater 8, second superheater 9, condenser/evaporator 10, cooling evaporator 13, first 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, second vaporizer 13-1.
The first described 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 the second 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-Ka Linne 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, be different from traditional steam Rankine cycle based on Rankine cycle principle and utilize vapor plume as the low boiling working fluid of thermal source as the combined cycle system of ammonia steam Rankine cycle, adopt vapour condenser operation under positive pressure mode, using the thermal source of turbine discharge 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, be combined with each other ingenious for the vaporizer in vapour condenser and low boiling working fluid Rankine cycle, the latent heat of vaporization of steam is utilized effectively, except steam sensible heat utilization etc. has higher efficiency than steam Rankine cycle, the latent heat of vaporization of steam is only utilized to generate electricity this block just nearly more than 50 KWhs/ton of steam, therefore the absolute thermal efficiency of whole system improves more than 2%, because back pressure adopts malleation mode to run, steam turbine outlet exhaust steam can ensure certain degree of superheat, and the steam first pressing of new-built unit can adopt overcritical or ultra-supereritical pressure, improves the power generation cycle thermal efficiency further.
2, low equipment investment, operating cost significantly decline:
(1) eliminate that traditional vapour condenser negative pressure operation technique inevitably leaks gas, water leakage phenomenon, without the need to arranging oxygen-eliminating device, air ejector in Rankine cycle circuit, avoiding traditional oxygen-eliminating device, air ejector etc. and running the loss of steam and water caused; Avoid pollution and loss of steam and water that conventional art reclaims water of condensation, only need the water loss that the turbine shaft leak sealing vapour of supplementary minute quantity causes, fill into system by outsourcing or self-control distilled water;
(2) because of malleation, closed operation, avoid the oxygen corrosion of traditional Rankine cycle steam generator system, scaling phenomenon, system loss of steam and water significantly declines, without the need to being equipped with huge, complicated chemical water treatment system, the operating cost of water treatment system significantly declines, and absolute value can reduce by 90%;
(3) because of much smaller than traditional vapour condenser of the exhaust steam specific volume of steam turbine, the volume of steam turbine can significantly reduce, vapour condenser volume ratio conventional art much smaller, and thus the relative price of steam turbine, condenser apparatus reduces a lot.
3, 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.
4, safety in operation significantly improves:
(1) because the back pressure of steam turbine in steam Rankine cycle adopts malleation mode to run, steam turbine outlet exhaust steam can ensure certain degree of superheat, overcome the design that traditional Rankine cycle power generator turbine exhaust stage blade brings because of wet vapor, run and safety problem, steam turbine back pressure operation under positive pressure, outlet vapor is superheated vapor, fundamentally eliminate the problem design that in conventional vapor Rankine cycle, last stage vane of steam turbine brings because of wet vapor, manufacture and operation problem, the operating conditions of steam turbine is optimized, obviously improve before the vibration comparatively of steam turbine generator set,
(2) the oxygen corrosion Safety performance of steam boiler system is obviously improved, and avoids conventional vapor Rankine cycle generator set because of the operation of vapour condenser negative pressure, the oxygen corrosion harm that air unavoidably bleeds and causes service system;
(3) scale hazard of steam Rankine cycle system is eliminated, and effectively alleviate the generation of the accidents such as the overheated booster of heating surface, the operating conditions of superheater obviously improves, and Security significantly improves;
(4) compared to traditional card Linne circulating technology, when adopting preferred version, without the need to arranging the heat exchanger of dividing wall type in flue, the heat adopting the better split type phase-change heat-exchanger condenser separated type recovered flue gas of Security in generation, numerous safety problems that the wearing and tearing caused because of the dust in flue gas, aggressive medium etc., corrosion cause low boiling working fluid to follow smoke contacts and cause are solved at all; Low boiling working fluid carries out wall-type heat exchange in phase-change heat-exchanger condenser, because nontoxic, the non-combustion-supporting material of water vapour, the non-excellent feature such as flammable, fire-retardant, even if leak, accident also easily obtains process, controls, the vaporizer in low boiling working fluid Rankine cycle or and the operating conditions of superheater obviously improve;
(5) because steam Rankine cycle steam discharge adopts malleation, therefore can guide to by pipeline the safe place adopting reliable protection measure, low boiling working fluid Rankine cycle system (comprising phase-change heat-exchanger condenser) independently can be arranged in safe and reliable protective zone and to be equipped with reliable safety installations, avoid directly being staggered in together and the problems that cause with steam Rankine cycle system, the Security of low boiling working fluid Rankine cycle system obtains Reliable guarantee, for its industrial applications eliminates safe hidden trouble further.
Accompanying drawing explanation
Fig. 1 is a kind of steam Rankine of the present invention-low boiling working fluid Rankine 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-first steam turbine, 5-exhaust steam, 6-water of condensation, 7-feed water pump, 8-feed water preheater, 9-second superheater, 10-condenser/evaporator, 11-liquid refrigerant, 12-recycle pump, 13-cooling evaporator, 13-1-second vaporizer, 13-2-second condenser, 14-first vaporizer, 15-regenerator, 16-low boiling working fluid superheated vapor, 17-second steam turbine, 18-first condenser, 19-backflows liquid, 20-generator, 21-steam-driven generator, 22-exhaust steam regenerator, 23-flue, 24-distilled water, 25-distilled water tank, 26-small pump, 27-oxygen-eliminating device, 28-mixed bed, 29-backflows water pipeline, 30-air, 31-gas fan, 32-air preheater, 33-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 combined cycle generating unit, this device comprises steam Rankine cycle, low boiling working fluid Rankine cycle system, and specific embodiment is as follows:
The Rankine cycle of ammonia steam 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 the first steam turbine 4 and drives steam-driven generator 21 to generate electricity; The exhaust steam 5 out of first steam turbine 4 forms water of condensation 6 through the second superheater 9, condenser/evaporator 10, and water of condensation 6 through feed water pump 7, feed water preheater 8, boiler body 1, then produces saturated vapour, thus forms steam Rankine cycle circuit.
In described ammonia steam Rankine cycle circuit, condenser/evaporator 10, cooling evaporator 13, first vaporizer 14 adopt parallel running mode, ammoniacal liquor 11 is through ammonia circulating pump 12, regenerator 15, condenser/evaporator 10, ammonia circulating pump 12, first vaporizer 14, exhaust steam regenerator 22, and ammonia circulating pump 12, condenser/evaporator 10, the ammonia steam produced forms ammoniacal liquor 11 through the second superheater 9, second steam turbine 17, exhaust steam regenerator 22, first vaporizer 14, first condenser 18, enter ammonia circulating pump 12 again, thus form ammonia steam Rankine cycle circuit.
The pressure of the exhaust steam 5 that the first described steam turbine 4 is discharged is higher than atmospheric pressure.
Heat transferring medium ammoniacal liquor and the flue gas of described cooling evaporator 13 adopt separated type heat exchange mode, cooling evaporator 13 comprises the second vaporizer 13-1, the second condenser 13-2, wherein the second vaporizer 13-1 is arranged in flue 23, second condenser 13-2 is arranged in outside flue 23, and phase-change working substance wherein adopts water; The heat that phase-change working substance absorbs flue gas in the second vaporizer 13-1 produces saturated vapour, saturated vapour in the second condenser 13-2 as the thermal source of ammoniacal liquor, by the second condenser 13-2 and ammoniacal liquor 11 wall-type heat exchange, condensation water is formed again by the second vaporizer 13-1 after cooling, the heat absorbing flue gas produces steam again, thus forms the Inner eycle loop of phase-change working substance; Phase-change working substance adopts natural circulation.
Be provided with the makeup Water System supporting with steam Rankine cycle system: the distilled water 24 in distilled water tank 25, after small pump 26, normal temp. deaerator 27 deoxygenation, mixed bed 28 desalination, fill into steam Rankine cycle system.
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, second vaporizer 13-1.
Described feed water preheater 8, second superheater 9, condenser/evaporator 10, cooling evaporator 13, first vaporizer 14, exhaust steam regenerator 22 can arrange one or more respectively, adopt series, parallel or series-parallel connection mode to connect.
The first described 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 the second 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-Ka Linne 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 (4)
1. steam Rankine-low boiling working fluid Rankine combined cycle generating unit, this device comprises steam Rankine cycle circuit and low boiling working fluid Rankine cycle circuit, it is characterized in that:
In described steam Rankine cycle circuit, the pressure of the exhaust steam (5) that the first steam turbine (4) is discharged is higher than atmospheric pressure;
Described steam Rankine cycle circuit, refer to by boiler body (1) saturated vapour out (2), form superheated vapor (3-1) through the first superheater (3), send into the first steam turbine (4) and drive steam-driven generator (21) generating; First steam turbine (4) exhaust steam out (5) is through the second superheater (9) and condenser/evaporator (10), cooled by the low boiling working fluid of low boiling working fluid Rankine cycle and form water of condensation (6), water of condensation (6) is through 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 circuit is provided with the second superheater (9): liquid refrigerant (11) is through recycle pump (12), condenser/evaporator (10), the low boiling working fluid steam produced forms low boiling working fluid superheated vapor (16) through the second superheater (9), enter the second steam turbine (17) again, drawing generator (20) generates electricity, the exhaust steam of discharging from the second steam turbine (17) forms liquid refrigerant (11) through the first 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), the first vaporizer (14), the low boiling working fluid steam produced forms low boiling working fluid superheated vapor (16) through the second superheater (9), enter the second steam turbine (17) again, drawing generator (20) generates electricity, the exhaust steam of discharging from the second steam turbine (17) forms liquid refrigerant (11) through the first 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), cooling evaporator (13), the low boiling working fluid steam produced forms low boiling working fluid superheated vapor (16) through the second superheater (9), enter the second steam turbine (17) again, drawing generator (20) generates electricity, the exhaust steam of discharging from the second steam turbine (17) forms liquid refrigerant (11) through the first condenser (18) cooling, enter recycle pump (12) again, thus form low boiling working fluid Rankine cycle circuit,
Be provided with normal temp. deaerator (27): the distilled water (24) in distilled water tank (25), fill into steam Rankine cycle circuit through small pump (26), normal temp. deaerator (27), mixed bed (28);
Described low boiling working fluid boiling point is at normal atmospheric pressure less than-10 DEG C.
2. device according to claim 1, is characterized in that:
Be provided with regenerator (15): the lean solution of the part or all of vaporizer generation of condenser/evaporator (10), the first vaporizer (14), cooling evaporator (13), through regenerator (15), the pipeline that backflows (19), gets back to the first condenser (18); Liquid refrigerant (11) is through recycle pump (12), regenerator (15) or and condenser/evaporator (10) or and the first vaporizer (14) or and the part or all of generation low boiling working fluid steam of cooling evaporator (13).
3. device according to claim 1, is characterized in that:
Be provided with exhaust steam regenerator (22): the low boiling working fluid steam that liquid refrigerant (11) produces through recycle pump (12), the first vaporizer (14) forms liquid refrigerant (11) through exhaust steam regenerator (22), the second superheater (9), the second steam turbine (17), exhaust steam regenerator (22), the first vaporizer (14), the first condenser (18), enter recycle pump (12) again, thus form low boiling working fluid Rankine cycle circuit; Or the low boiling working fluid steam that liquid refrigerant (11) produces through recycle pump (12), condenser/evaporator (10) forms liquid refrigerant (11) through exhaust steam regenerator (22), the second superheater (9), the second steam turbine (17), exhaust steam regenerator (22), condenser/evaporator (10), the first condenser (18), enter recycle pump (12) again, thus form low boiling working fluid Rankine cycle circuit.
4., according to the device one of claims 1 to 3 Suo Shu, it is characterized in that:
Flue gas in described cooling evaporator (13) adopts separated type heat exchange mode with liquid refrigerant (11): cooling evaporator (13) comprises the second vaporizer (13-1), the second condenser (13-2), wherein the second vaporizer (13-1) is arranged in flue (23), and the second condenser (13-2) is arranged in flue (23) outward; The heat that phase-change working substance absorbs flue gas in the second vaporizer (13-1) produces saturated vapour, saturated vapour in the second condenser (13-2) as the thermal source of liquid refrigerant, by the second condenser (13-2) and liquid refrigerant (11) wall-type heat exchange, the heat that after cooling, formation condensation water absorbs flue gas by the second vaporizer (13-1) again produces steam again, thus forms the Inner eycle loop of phase-change working substance.
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| CN201310029384.5A CN103089355B (en) | 2013-01-27 | 2013-01-27 | Steam Rankine-low boiling working fluid Rankine combined cycle generating unit |
| PCT/CN2013/088275 WO2014114139A1 (en) | 2013-01-27 | 2013-12-02 | Steam rankine-low boiling point working fluid rankine joint cycle power generation apparatus |
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| CN201310029384.5A CN103089355B (en) | 2013-01-27 | 2013-01-27 | Steam Rankine-low boiling working fluid Rankine combined cycle generating unit |
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| CN103089355B (en) * | 2013-01-27 | 2015-07-29 | 南京瑞柯徕姆环保科技有限公司 | Steam Rankine-low boiling working fluid Rankine combined cycle generating unit |
| IT202000000784A1 (en) * | 2020-01-17 | 2021-07-17 | Sit Tech | CLOSED-LOOP POWER PLANT ORGANIC RANKINE FLASH |
| CN114837762B (en) * | 2022-04-21 | 2023-05-30 | 西安热工研究院有限公司 | S-CO 2 Coupled steam Rankine cycle power generation system and working method |
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| CN103089355A (en) | 2013-05-08 |
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