CN103147806B - Steam Rankine-organic Rankine combined cycle power generation device - Google Patents
Steam Rankine-organic Rankine combined cycle power generation device Download PDFInfo
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- 238000010248 power generation Methods 0.000 title abstract description 6
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 70
- 239000003546 flue gas Substances 0.000 claims abstract description 26
- UGFAIRIUMAVXCW-UHFFFAOYSA-N Carbon monoxide Chemical compound [O+]#[C-] UGFAIRIUMAVXCW-UHFFFAOYSA-N 0.000 claims abstract description 25
- 239000007789 gas Substances 0.000 claims abstract description 9
- 239000006200 vaporizer Substances 0.000 claims description 46
- 239000007788 liquid Substances 0.000 claims description 31
- 238000001816 cooling Methods 0.000 claims description 25
- 238000009833 condensation Methods 0.000 claims description 14
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- OFBQJSOFQDEBGM-UHFFFAOYSA-N Pentane Chemical compound CCCCC OFBQJSOFQDEBGM-UHFFFAOYSA-N 0.000 description 4
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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 invention relates to a steam Rankine-organic Rankine combined cycle power generation device, wherein steam in a steam Rankine cycle is cooled by an organic working medium in an organic Rankine cycle, and latent heat of vaporization of the steam in the steam Rankine cycle is recycled to be used for organic Rankine cycle power generation, so that the steam Rankine cycle and the organic Rankine cycle are combined together and an implementable combined recycling device is formed; and meanwhile, the safety difficult problem that waste heat of flue gas is recycled by the organic Rankine cycle is solved, exhaust gas temperature is effectively reduced, and low-temperature corrosion of the flue gas is avoided, and waste gas, waste water and waste heat of waste steam in a steam Rankine cycle system can be effectively recycled. The steam Rankine-organic Rankine combined cycle power generation device can be used for energy-saving reconstruction of existing units, also can be used for designing and constructing new generator units as well, and is especially suitable for new construction, extension and reconstruction of generator units in severe cold areas, water-deficient areas, power shortage areas and the like, so that economic, social and environmental-friendly benefits are remarkable.
Description
Technical field
The present invention relates to a kind of steam Rankine-organic 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.
Zhang Hong (the organic Rankine bottoming cycle pure low-temperature cogeneration technology [J] of low boiling working fluid. cement .2006.No.8) compare conventional water vapour Rankine cycle and the organic Rankine bottoming cycle features when reclaiming low etc. and middle constant enthalpy heat for pentane.
When utilizing low temperature organic working medium, capital equipment has: vaporizer, steam turbine, condenser and pentane recycle pump.For low grade and medium enthalpy heat, ORC technology has many good qualities than conventional water vapour Rankine cycle, mainly in recovery sensible heat, has higher efficiency, and because in circulation, sensible heat/latent heat ratio is unequal, in ORC technology, this ratio is large.Therefore ORC technology is adopted can to reclaim more heat than water steam.
But ORC technology also has its intrinsic shortcoming: because organic working medium may have the features such as flammable, blast, when boiler or industrial furnace back-end ductwork utilize fume afterheat to organize ORC, 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.This is the difficult problem that ORC technology reclaims dust-laden, must solve when having the fume afterheat of corrosive deposit in electric power station system.
Therefore the thermomechanics basic law in steam Rankine cycle thermal power plant how is utilized, use for reference the innovative approach that the combined cycle scheduling theory such as thinking and Rankine-Kalina is organized in compound Rankine cycle, retain the advantage based on the power plant technology of Rankine cycle principle, inquire into new combined cycle theoretical, really find the new way increasing substantially thermodynamic cycle power plant thermal efficiency, become the difficult point of this area research.
Summary of the invention
Object of the present invention is for solving above-mentioned steam Rankine cycle Problems existing, and the shortcoming that ORC technology circulating technology exists, a kind of new thermal power plant's combined cycle flow process is proposed, i.e. steam Rankine-organic Rankine combined cycle generating unit, traditional steam Rankine cycle can be substituted, solve the key issue of ORC unit safety operation simultaneously, in recovered steam Rankine cycle, the latent heat of vaporization of steam is used for the generating of low-temperature end organic Rankine bottoming cycle, 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-organic Rankine combined cycle generating unit, this device comprises steam Rankine cycle, organic Rankine bottoming 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 superheater 3, sends into steam turbine 4 and drives steam-driven generator 21 to generate electricity; Steam turbine 4 exhaust steam 5 out forms water of condensation 6 through 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 organic Rankine bottoming cycle, refer to that liquid organic working medium 11 sends into condenser/evaporator 10, cooling evaporator 13, organic working medium vaporizer 14 respectively or successively through recycle pump 12, the organic working medium steam produced forms organic working medium superheated vapor 16 through superheater 9, enter organic working medium steam turbine 17 again, drag organic working medium generator 20 to generate electricity, the exhaust steam of discharging from organic working medium steam turbine 17 cools the liquid organic working medium 11 of formation through organic working medium condenser 18, enter recycle pump 12 again, thus form organic Rankine cycle circuit.
Described liquid organic working medium 11 is the organic working medium of one-component, or be low boiling component with organic working medium, the high boiling component mixed solution etc. that is absorbing agent.
When described liquid organic working medium is Multi component, liquid organic working medium 11 through recycle pump 12 or and regenerator 15 send into condenser/evaporator 10, cooling evaporator 12, organic working medium vaporizer 14 successively or respectively, the lean solution formed returns organic working medium condenser 18 through regenerator 15, the pipeline 19 that backflows, the organic working medium steam produced forms liquid organic working medium 11 through superheater 9, organic working medium steam turbine 17, organic working medium vaporizer 14, organic working medium condenser 18, return recycle pump 12, thus form organic Rankine cycle circuit.
The pressure of the exhaust steam 5 that described steam turbine 4 is discharged is higher than atmospheric pressure.
Described steam Rankine cycle circuit and organic Rankine bottoming cycle loop by superheater 9, condenser/evaporator 10 or and cooling evaporator 13 or and organic working medium vaporizer 14, by the Rankine cycle of temperature end steam together with low-temperature end organic Rankine bottoming 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 low-temperature end organic Rankine bottoming cycle.
Heat transferring medium organic working medium and the flue gas of described cooling evaporator 13 adopt separated type heat exchange mode, cooling evaporator 13 comprises vaporizer 13-1, condenser 13-2, wherein vaporizer 13-1 is arranged in flue 23, 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 vaporizer 13-1 produces saturated vapour, saturated vapour is as the thermal source of liquid organic working medium 11, by condenser 13-2 and liquid organic working medium 11 wall-type heat exchange, form condensation water after cooling and produce steam again by the heat of vaporizer 13-1 absorption flue gas again, thus form the Inner eycle loop of phase-change working substance; Phase-change working substance adopts natural circulation or pump circulation mode.
Be provided with exhaust steam regenerator 22: the organic working medium steam that organic working medium vaporizer 14 produces gets back to organic working medium vaporizer 14 through exhaust steam regenerator 22, superheater 9, organic working medium steam turbine 17, exhaust steam regenerator 22, organic working medium vaporizer 14, organic working medium condenser 18, recycle pump 12, thus forms organic 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, superheater 9, condenser/evaporator 10, cooling evaporator 13, organic working medium vaporizer 14, exhaust steam regenerator 22 can arrange one or more respectively, adopt series, parallel or series-parallel connection mode to connect.
The air 30 that gas fan 31 is sent here enters air preheater 32, form hot air 33, enter fuel-burning equipment 34 and participate in burning, the high-temperature flue gas of generation is discharged after reducing temperature through boiler body 1, superheater 2, feed water preheater 8, air preheater 32, vaporizer 13-1.
Described organic working medium condenser 18 conveniently technology is arranged, and adopts water or air etc. as cooling medium.
The heat-exchanging element of aforementioned device mentioned in the present invention can adopt tubulation, fin tube, coiler or spiral groove pipe, or adopts the pipe of other augmentation of heat transfer measures or the hollow cavity heat-exchanging element of other patterns.
While controlling a little higher than flue gas acid dew point temperature of wall surface temperature of vaporizer 13-1 heat exchanger surface, or adopt corrosion-resistant material effectively to alleviate the cold end corrosion of flue gas, can effectively reduce temperature of exhaust fume, avoiding flue gas low-temperature to corrode, high efficiente callback fume afterheat.
Unaccounted equipment and standby system, pipeline, instrument, valve in the present invention, be incubated, there is regulatory function bypass facility etc. adopt known mature technology to carry out supporting.
Be provided with the regulating controller supporting with present system, the known Mature Regulation technology of existing steam Rankine cycle power station, Cheng's cycle power station or gas-steam combined cycle power plant is adopted to carry out supporting, steam Rankine-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-organic 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 the organic rankine cycle system of vapor plume and organic working medium wall-type heat exchange, adopt vapour condenser operation under positive pressure mode, using the thermal source of turbine discharge as organic Rankine bottoming cycle, the utilization of organic rankine cycle system centering low-temperature heat source is utilized to have more high efficiency feature, be combined with each other by the vaporizer in vapour condenser and organic Rankine bottoming cycle or with superheater is ingenious, 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; The condenser of organic rankine cycle system because of organic working medium specific volume less, volume compact, heat transfer are efficient.
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, reaches 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 of recovery is used for organic 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 organic 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 organic Rankine bottoming cycle 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 organic working medium to follow smoke contacts and cause are solved at all; Organic working medium 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 organic Rankine bottoming 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, organic 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 organic 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-organic Rankine combined cycle generating unit schematic flow sheet of the present invention.
In Fig. 1: 1-boiler body, 2-saturated vapour, 3-superheater, 3-1-superheated vapor, 4-steam turbine, 5-exhaust steam, 6-water of condensation, 7-feed water pump, 8-feed water preheater, 9-superheater, 10-condenser/evaporator, the liquid organic working medium of 11-, 12-recycle pump, 13-cooling evaporator, 13-1-vaporizer, 13-2-condenser, 14-organic working medium vaporizer, 15-regenerator, 16-organic working medium superheated vapor, 17-organic working medium steam turbine, 18-organic working medium condenser, 19-backflows liquid, 20-organic working medium generator, 21-vapour 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-organic Rankine Rankine combined cycle generating unit, this device comprises steam Rankine cycle, organic rankine cycle system, and specific embodiment is as follows:
Described steam Rankine cycle, refers to by boiler body 1 saturated vapour 2 out, forms superheated vapor 3-1 through superheater 3, sends into steam turbine 4 and drives steam-driven generator 21 to generate electricity; Steam turbine 4 exhaust steam 5 out forms water of condensation 6 through 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 organic Rankine bottoming cycle, refer to that liquid organic working medium 11 sends into condenser/evaporator 10, cooling evaporator 13, organic working medium vaporizer 14 respectively or successively through recycle pump 12, the organic working medium steam produced forms organic working medium superheated vapor 16 through superheater 9, enter organic working medium steam turbine 17 again, drag organic working medium generator 20 to generate electricity, the exhaust steam of discharging from organic working medium steam turbine 17 cools the liquid organic working medium 11 of formation through organic working medium condenser 18, enter recycle pump 12 again, thus form organic Rankine cycle circuit.
When described liquid organic working medium is Multi component, liquid organic working medium 11 through recycle pump 12 or and regenerator 15 send into condenser/evaporator 10, cooling evaporator 12, organic working medium vaporizer 14 successively or respectively, the lean solution formed returns organic working medium condenser 18 through regenerator 15, the pipeline 19 that backflows, the organic working medium steam produced forms liquid organic working medium 11 through superheater 9, organic working medium steam turbine 17, organic working medium vaporizer 14, organic working medium condenser 18, return recycle pump 12, thus form organic Rankine cycle circuit.
The pressure of the exhaust steam 5 that described steam turbine 4 is discharged is higher than atmospheric pressure.
Described steam Rankine cycle circuit and organic Rankine bottoming cycle loop are by superheater 9, condenser/evaporator 10, cooling evaporator 13, organic working medium vaporizer 14, by the Rankine cycle of temperature end steam together with low-temperature end organic Rankine bottoming 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 low-temperature end organic Rankine bottoming cycle.
Heat transferring medium organic working medium and the flue gas of described cooling evaporator 13 adopt separated type heat exchange mode, cooling evaporator 13 comprises vaporizer 13-1, condenser 13-2, wherein vaporizer 13-1 is arranged in flue 23, 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 vaporizer 13-1 produces saturated vapour, saturated vapour is as the thermal source of liquid organic working medium 11, by condenser 13-2 and liquid organic working medium 11 wall-type heat exchange, form condensation water after cooling and produce steam again by the heat of vaporizer 13-1 absorption flue gas again, thus form the Inner eycle loop of phase-change working substance; Phase-change working substance adopts natural circulation or pump circulation mode.
Be provided with exhaust steam regenerator 22: the organic working medium steam that organic working medium vaporizer 14 produces gets back to organic working medium vaporizer 14 through exhaust steam regenerator 22, superheater 9, organic working medium steam turbine 17, exhaust steam regenerator 22, organic working medium vaporizer 14, organic working medium condenser 18, recycle pump 12, thus forms organic 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, superheater 9, condenser/evaporator 10, cooling evaporator 13, organic working medium vaporizer 14, exhaust steam regenerator 22 can arrange one or more respectively, adopt series, parallel or series-parallel connection mode to connect.
The air 30 that gas fan 31 is sent here enters air preheater 32, form hot air 33, enter fuel-burning equipment 34 and participate in burning, the high-temperature flue gas of generation is discharged after reducing temperature through boiler body 1, superheater 2, feed water preheater 8, air preheater 32, vaporizer 13-1.
Described organic working medium condenser 18 conveniently technology is arranged, and adopts water or air etc. as cooling medium.
The heat-exchanging element of aforementioned device mentioned in the present invention can adopt tubulation, fin tube, coiler or spiral groove pipe, or adopts the pipe of other augmentation of heat transfer measures or the hollow cavity heat-exchanging element of other patterns.
While controlling a little higher than flue gas acid dew point temperature of wall surface temperature of vaporizer 13-1 heat exchanger surface, or adopt corrosion-resistant material effectively to alleviate the cold end corrosion of flue gas, can effectively reduce temperature of exhaust fume, avoiding flue gas low-temperature to corrode, high efficiente callback fume afterheat.
Unaccounted equipment and standby system, pipeline, instrument, valve in the present invention, be incubated, there is regulatory function bypass facility etc. adopt known mature technology to carry out supporting.
Be provided with the regulating controller supporting with present system, the known Mature Regulation technology of existing steam Rankine cycle power station, Cheng's cycle power station or gas-steam combined cycle power plant is adopted to carry out supporting, steam Rankine-organic 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 (6)
1. steam Rankine-organic Rankine combined cycle generating unit, this device comprises steam Rankine cycle and organic rankine cycle system, it is characterized in that:
In described steam Rankine cycle, the pressure of the exhaust steam (5) that steam turbine (4) is discharged is higher than atmospheric pressure;
Described steam Rankine cycle, refers to by boiler body (1) saturated vapour out (2), forms superheated vapor (3-1) through superheater (3), sends into steam turbine (4) and drives steam-driven generator (21) generating; Steam turbine (4) exhaust steam out (5) through superheater (9) or and condenser/evaporator (10), cooled by the organic working medium of organic Rankine bottoming 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 organic rankie cycle loop is provided with superheater (9): liquid organic working medium (11) is through recycle pump (12), condenser/evaporator (10), the organic working medium steam produced forms organic working medium superheated vapor (16) through superheater (9), enter organic working medium steam turbine (17) again, drag organic working medium generator (20) generating, the exhaust steam of discharging from organic working medium steam turbine (17) forms liquid organic working medium (11) through organic working medium condenser (18) cooling, enter recycle pump (12) again, thus form organic Rankine cycle circuit; Or liquid organic working medium (11) is through recycle pump (12), organic working medium vaporizer (14), the organic working medium steam produced forms organic working medium superheated vapor (16) through superheater (9), enter organic working medium steam turbine (17) again, drag organic working medium generator (20) generating, the exhaust steam of discharging from organic working medium steam turbine (17) forms liquid organic working medium (11) through organic working medium condenser (18) cooling, enter recycle pump (12) again, thus form organic Rankine cycle circuit; Or liquid organic working medium (11) is through recycle pump (12), cooling evaporator (13), the organic working medium steam produced forms organic working medium superheated vapor (16) through superheater (9), enter organic working medium steam turbine (17) again, drag organic working medium generator (20) generating, the exhaust steam of discharging from organic working medium steam turbine (17) forms liquid organic working medium (11) through organic working medium condenser (18) cooling, enter recycle pump (12) again, thus form organic Rankine cycle circuit;
Be provided with makeup Water System: the distilled water (24) in distilled water tank (25), fill into steam Rankine cycle system through small pump (26), normal temp. deaerator (27);
Be provided with mixed bed (28): the distilled water (24) in distilled water tank (25), fill into steam Rankine cycle system through small pump (26), normal temp. deaerator (27), mixed bed (28).
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), organic working medium vaporizer (14), cooling evaporator (13), through regenerator (15), the pipeline that backflows (19), gets back to organic working medium condenser (18); Liquid organic working medium (11) is through recycle pump (12), regenerator (15) or and condenser/evaporator (10) or and organic working medium vaporizer (14) or and the part or all of generation organic working medium steam of cooling evaporator (13).
3. device according to claim 1, is characterized in that:
Be provided with exhaust steam regenerator (22): the organic working medium steam that liquid organic working medium (11) produces through recycle pump (12), organic working medium vaporizer (14) forms liquid organic working medium (11) through exhaust steam regenerator (22), superheater (9), organic working medium steam turbine (17), exhaust steam regenerator (22), organic working medium vaporizer (14), organic working medium condenser (18), enter recycle pump (12) again, thus form organic Rankine cycle circuit; Or the organic working medium steam that liquid organic working medium (11) produces through recycle pump (12), condenser/evaporator (10) forms liquid organic working medium (11) through exhaust steam regenerator (22), superheater (9), organic working medium steam turbine (17), exhaust steam regenerator (22), condenser/evaporator (10), organic working medium condenser (18), enter recycle pump (12) again, thus form organic 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 organic working medium (11): cooling evaporator (13) comprises vaporizer (13-1), condenser (13-2), wherein vaporizer (13-1) is arranged in flue (23), and condenser (13-2) is arranged in flue (23) outward; The heat that phase-change working substance absorbs flue gas in vaporizer (13-1) produces saturated vapour, saturated vapour in condenser (13-2) as the thermal source of liquid organic working medium, by condenser (13-2) and liquid organic working medium (11) wall-type heat exchange, condensation water is formed again by vaporizer (13-1) after cooling, the heat absorbing flue gas produces steam again, thus forms the Inner eycle loop of phase-change working substance.
5. the device according to Claims 2 or 3, is characterized in that:
Be provided with air preheater (32): the air (30) that gas fan (31) is sent here forms hot air (33) through air preheater (32), enter fuel-burning equipment (34) and participate in burning, the high-temperature flue gas of generation through boiler body (1), superheater (3) or and feed water preheater (8), air preheater (32) or and vaporizer (13-1) reduce temperature after discharge.
6. device according to claim 5, is characterized in that:
Described superheater (3), feed water preheater (8), superheater (9), condenser/evaporator (10), cooling evaporator (13), organic working medium vaporizer (14), air preheater (32), regenerator (15), exhaust steam regenerator (22) can arrange one or more respectively, adopt series, parallel or series-parallel connection mode to connect.
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| CA2701592A1 (en) * | 2009-05-06 | 2010-11-06 | General Electric Company | Organic rankine cycle system and method |
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| CN202645658U (en) * | 2012-07-04 | 2013-01-02 | 河北联合大学 | Fuel-steam-organic working medium combined cycle power generation unit |
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| CA2701592A1 (en) * | 2009-05-06 | 2010-11-06 | General Electric Company | Organic rankine cycle system and method |
| CN101929360A (en) * | 2010-09-02 | 2010-12-29 | 上海交通大学 | Medium-low temperature heat source generating set based on energy cascade utilization and thermal circulation method thereof |
| CN202024347U (en) * | 2011-03-09 | 2011-11-02 | 南京华电节能环保设备有限公司 | Boiler low-temperature flue gas waste heat recovery plant |
| CN202645658U (en) * | 2012-07-04 | 2013-01-02 | 河北联合大学 | Fuel-steam-organic working medium combined cycle power generation unit |
| CN203097965U (en) * | 2013-01-27 | 2013-07-31 | 南京瑞柯徕姆环保科技有限公司 | Vapor Rankine and organic Rankine combined cycle electricity generation device |
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