CN103089351B - Steam extraction type steam Rankine-low boiling point working medium Rankine combined cycle power generation device - Google Patents
Steam extraction type steam Rankine-low boiling point working medium Rankine combined cycle power generation device Download PDFInfo
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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
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Abstract
The invention relates to a steam extraction type steam Rankine-low boiling point working medium Rankine combined cycle power generation device. A low boiling point working medium in a low boiling point working medium Rankine cycle is used for cooling extraction steam in a steam Rankine cycle, latent heat of vaporization of the extraction steam in the steam Rankine cycle is recovered for power generation of the low boiling point working medium Rankine cycle, and therefore the steam Rankine and the low boiling point working medium Rankine cycle are compounded together. At the same time, a safety problem existing when the low boiling point working medium Rankine cycle recovers waste heat of exhaust gas is solved, the waste heat of the exhaust gas is effectively recovered, low temperature corrosion of the exhaust gas is avoided, and the exhaust gas, waste water and the waste heat of the exhaust gas are effectively recovered and utilized. The steam extraction type steam Rankine-low boiling point working medium Rankine combined cycle power generation device not only can be used for energy conservation improvement on an existing machine unit, but also can be used for designing and building a newly built machine unit. The steam extraction type steam Rankine-low boiling point working medium Rankine combined cycle power generation device is especially suitable for new construction, extending construction and reconstruction of a power unit in water-deficient areas, power shortage areas and other areas, and therefore the steam extraction type steam Rankine-low boiling point working medium Rankine combined cycle power generation device has remarkable economic, social and environmental protection benefits.
Description
Technical field
The present invention relates to one to draw gas type steam Rankine-low boiling working fluid Rankine combined cycle generating unit, specifically belong to 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, propose one to draw gas type steam Rankine-low boiling working fluid Rankine combined cycle generating unit, reducing energy consumption can be carried out to existing steam Rankine cycle unit, adopt steam turbine draw gas as the thermal source of low boiling working fluid Rankine cycle unit, while effectively alleviating the load of vapour condenser, the a large amount of latent heat of vaporization reclaiming release when drawing gas condensation generates electricity for low boiling working fluid Rankine cycle, and can to hot waste water, the waste heat of waste vapour carries out integrated recovery, solve the key issue of low boiling working fluid Rankine cycle unit safety operation simultaneously, thus effectively improve the thermal efficiency of 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 superheater 3, sends into steam turbine 4 and drives steam-driven generator 21 to generate electricity; Steam turbine 4 vapour condenser 5 out forms water of condensation 6, and water of condensation 6 is sent into boiler body 1 through condensate pump 6-1, oxygen-eliminating device 7-1, feed water pump 7, feed water preheater 8, then produced saturated vapour, thus forms steam Rankine cycle circuit.
Described low boiling working fluid Rankine cycle, refer to that liquid 11 send into condenser/evaporator 10, cooling evaporator 12, 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 superheater 9, enter steam turbine 17 again, drawing generator 20 generates electricity, the exhaust steam of discharging from steam turbine 17 cools formation liquid refrigerant 11 through condenser 18, then enters recycle pump 12, thus forms low boiling working fluid Rankine cycle circuit.
Described superheater 9, condenser/evaporator 10 adopt the 4-1 that draws gas of steam Rankine cycle as thermal source, and the 4-1 that draws gas forms condensed water 24 through cooling and returns steam Rankine cycle system.
Described liquid refrigerant comprises low boiling working fluid, for one-component or the multi-component mixing material that is absorbing agent with higher boiling working medium, include but not limited to organic working medium, ammonia water mixture, low boiling working fluid boiling point is at normal atmospheric pressure less than-10 DEG C, and has good thermostability.
When described low boiling working fluid adopts Multi component, liquid refrigerant 11 through recycle pump 12 or and regenerator 15 successively or respectively send into condenser/evaporator 10, cooling evaporator 12, vaporizer 14, the lean solution formed returns condenser 18 through regenerator 15, the pipeline 19 that backflows, the low boiling working fluid steam produced forms liquid refrigerant 11 through superheater 9, steam turbine 17, vaporizer 14, condenser 18, return recycle pump 12, thus form low boiling working fluid Rankine cycle circuit.
Described steam Rankine cycle circuit by the superheater 9 of draw gas 4-1 and the low boiling working fluid Rankine cycle circuit of steam turbine 4, condenser/evaporator 10 or and cooling evaporator 13 or and vaporizer 14, by the Rankine cycle of temperature end steam together with low-temperature end low boiling working fluid Rankine cycle organic composite, the Rankine cycle of high efficiente callback temperature end steam draw gas 4-1 condensation time the latent heat of vaporization that discharges generate electricity for the Rankine cycle of low-temperature end low boiling working fluid.
Heat transferring medium and the liquid refrigerant 11 of described cooling evaporator 13 adopt separated type heat exchange mode with flue gas, 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 refrigerant, by condenser 13-2 and liquid refrigerant 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 low boiling working fluid steam that vaporizer 14 produces gets back to vaporizer 14 through exhaust steam regenerator 22, superheater 9, steam turbine 17, exhaust steam regenerator 22, vaporizer 14, condenser 18, recycle pump 12, thus form low boiling working fluid Rankine cycle circuit.
Described feed water preheater 8, superheater 9, condenser/evaporator 10, cooling evaporator 13, 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 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, make draw gas type steam Rankine-low boiling working fluid Rankine combined cycle generating unit energy economy, safety, high thermal efficiency operation, reach 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 type that the draws gas steam Rankine-low boiling working fluid Rankine combined cycle generating unit of the present invention's design, steam turbine drawn gas as the thermal source of low boiling working fluid as the Rankine cycle of ammonia steam, the utilization of low boiling working fluid Rankine cycle system centering low-temperature heat source is utilized to have more high efficiency feature, except the sensible heat drawn gas being used for except low boiling working fluid Rankine cycle efficiency power generation, also reclaim the more substantial latent heat of vaporization of drawing gas for generating simultaneously, only utilize the latent heat of vaporization of drawing gas to generate electricity this block just nearly more than 50 KWhs/ton of steam.
2, generator set operational safety performance improves:
(1) steam turbine draws gas and to generate electricity for low boiling working fluid Rankine cycle, vapour condenser load in steam Rankine cycle effectively alleviates, alleviate the security of operation problem that in steam Rankine cycle, last stage vane of steam turbine brings because of wet vapor simultaneously, the operating conditions of steam turbine is optimized, and obviously improves before the vibration comparatively of steam turbine generator set;
(2) time in conjunction with flue gas waste heat recovery scheme, 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 better split type phase-change heat-exchanger condenser of Security that adopts in generation reclaims heat, and numerous safety problems that the wearing and tearing caused because of the dust in flue gas, aggressive medium etc., corrosion cause liquid refrigerant to follow smoke contacts and cause are solved at all; Liquid refrigerant 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, and the operating conditions of the heat exchanger in low boiling working fluid Rankine cycle obviously improves;
(3) draw gas as malleation due to steam Rankine cycle, 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.
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, the solution of the present invention both can be used for design, the construction of newly-built combined power plants system, also can be used for existing pure condensate formula, take out solidifying, take out the back of the body unit carry out reducing energy consumption, 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 that one of the present invention is drawn gas type steam Rankine-low boiling working fluid Rankine combined cycle generating unit schematic flow sheet.
In Fig. 1: 1-boiler body, 2-saturated vapour, 3-superheater, 3-1-superheated vapor, 4-steam turbine, 4-1-draws gas, 5-vapour condenser, 6-water of condensation, 6-1-condensate pump, 7-feed water pump, 7-1-oxygen-eliminating device, 8-feed water preheater, 9-superheater, 10-condenser/evaporator, 11-liquid refrigerant, 12-recycle pump, 13-cooling evaporator, 13-1-vaporizer, 13-2-condenser, 14-vaporizer, 15-regenerator, 16-low boiling working fluid superheated vapor, 17-steam turbine, 18-condenser, 19-backflows liquid, 20-generator, 21-steam-driven generator, 22-exhaust steam regenerator, 23-flue, 24-condensed water, 30-air, 31-gas fan, 32-air preheater, 33-hot air, 34-fuel-burning equipment.
Embodiment
Below in conjunction with the drawings and specific embodiments, the present invention is described in further detail.
embodiment 1:
As shown in Figure 1, a kind of steam Rankine-low boiling working fluid Rankine 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 superheater 3, sends into steam turbine 4 and drives steam-driven generator 21 to generate electricity; Steam turbine 4 vapour condenser 5 out forms water of condensation 6, and water of condensation 6 is sent into boiler body 1 through condensate pump 6-1, oxygen-eliminating device 7-1, feed water pump 7, feed water preheater 8, then produced saturated vapour, thus forms steam Rankine cycle circuit.
Described ammonia steam Rankine cycle, refer to that ammoniacal liquor 11 sends into condenser/evaporator 10, cooling evaporator 12, ammonia evaporator 14 respectively or successively through ammonia circulating pump 12, the ammonia steam produced forms ammonia superheated vapor 16 through superheater 9, enter ammonia steam turbine 17 again, drag ammonia generator 20 to generate electricity, the exhaust steam of discharging from ammonia steam turbine 17 cools formation ammoniacal liquor 11 through ammonia condenser 18, then enters ammonia circulating pump 12, thus forms ammonia steam Rankine cycle circuit.
Described superheater 9, condenser/evaporator 10 adopt the 4-1 that draws gas of steam Rankine cycle as thermal source, and the 4-1 that draws gas forms condensed water 24 through cooling and returns steam Rankine cycle system.
Ammoniacal liquor 11 through ammonia circulating pump 12 or and regenerator 15 successively or respectively send into condenser/evaporator 10, cooling evaporator 12, ammonia evaporator 14, the lean solution formed returns ammonia condenser 18 through regenerator 15, the pipeline 19 that backflows, the ammonia steam produced forms ammoniacal liquor 11 through superheater 9, ammonia steam turbine 17, ammonia evaporator 14, ammonia condenser 18, return ammonia circulating pump 12, thus form ammonia steam Rankine cycle circuit.
Described steam Rankine cycle circuit is by superheater 9, condenser/evaporator 10, cooling evaporator 13, the ammonia evaporator 14 of draw gas 4-1 and the ammonia steam Rankine cycle circuit of steam turbine 4, by the Rankine cycle of temperature end steam together with low-temperature end ammonia steam Rankine cycle organic composite, the Rankine cycle of high efficiente callback temperature end steam draw gas 4-1 condensation time the latent heat of vaporization that discharges generate electricity for the Rankine cycle of low-temperature end ammonia steam.
Heat transferring medium ammoniacal liquor 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, and 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 vaporizer 13-1 produces saturated vapour, saturated vapour is as the thermal source of ammoniacal liquor, by condenser 13-2 and ammoniacal liquor 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.
Be provided with exhaust steam regenerator 22: the ammonia steam that ammonia evaporator 14 produces gets back to ammonia evaporator 14 through exhaust steam regenerator 22, superheater 9, ammonia steam turbine 17, exhaust steam regenerator 22, ammonia evaporator 14, ammonia condenser 18, ammonia circulating pump 12, thus form ammonia steam Rankine cycle circuit.
Described feed water preheater 8, ammonia superheater 9, condenser/evaporator 10, cooling evaporator 13, ammonia evaporator 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 ammonia 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, make draw gas type steam Rankine-low boiling working fluid Rankine combined cycle generating unit energy economy, safety, high thermal efficiency operation, reach 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. the type that draws gas steam Rankine-low boiling working fluid Rankine combined cycle generating unit, this device comprises steam Rankine cycle and low boiling working fluid Rankine cycle circuit, it is characterized in that:
Described low boiling working fluid Rankine cycle circuit is provided with superheater (9), adopt draw gas (4-1) of steam Rankine cycle steam turbine (4) as thermal source: liquid refrigerant (11) is divided into two-way through recycle pump (12), condenser (13-2) respectively through cooling evaporator (13) or vaporizer (14) produce low boiling working fluid steam, low boiling working fluid superheated vapor (16) is formed again through superheater (9), enter steam turbine (17), drawing generator (20) generates electricity, the exhaust steam of discharging from steam turbine (17) is through vaporizer (14), condenser (18) cooling forms liquid refrigerant (11), the condenser (13-2) of cooling evaporator (13) is or/and the lean solution that produces of vaporizer (14) is through the pipeline that backflows (19), get back to condenser (18), thus form low boiling working fluid Rankine cycle circuit,
Described cooling evaporator (13) comprises vaporizer (13-1), condenser (13-2), and 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 refrigerant (11), by condenser (13-2) and liquid refrigerant (11) wall-type heat exchange, the heat that after cooling, formation condensation water absorbs flue gas by vaporizer (13-1) again produces steam again, thus forms the Inner eycle loop of phase-change working substance;
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 condenser/evaporator (10): described cooling evaporator (13), or/and the lean solution that produces of vaporizer (14) is through condenser/evaporator (10), the pipeline that backflows (19), gets back to condenser (18); Liquid refrigerant (11) produces low boiling working fluid steam through recycle pump (12), condenser/evaporator (10), low boiling working fluid superheated vapor (16) is formed again through superheater (9), enter steam turbine (17), drawing generator (20) generates electricity, the exhaust steam of discharging from steam turbine (17) forms liquid refrigerant (11) through vaporizer (14), condenser (18) cooling, thus forms low boiling working fluid Rankine cycle circuit; Draw gas (4-1) of steam Rankine cycle steam turbine (4) forms condensed water (24) discharge through superheater (9), condenser/evaporator (10).
3. device according to claim 1, is characterized in that:
Be provided with exhaust steam regenerator (22): liquid refrigerant (11) is through recycle pump (12), vaporizer (14), the low boiling working fluid steam produced forms liquid refrigerant (11) through exhaust steam regenerator (22), superheater (9), steam turbine (17), exhaust steam regenerator (22), vaporizer (14), condenser (18), thus forms 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:
Be provided with regenerator (15): described cooling evaporator (13), or/and vaporizer (14) is or/and the lean solution that produces of condenser/evaporator (10) is through regenerator (15), the pipeline that backflows (19), gets back to condenser (18); Liquid refrigerant (11) produces low boiling working fluid steam through recycle pump (12), regenerator (15) and condenser/evaporator (10), form liquid refrigerant (11) through superheater (9), steam turbine (17), vaporizer (14), condenser (18), thus form low boiling working fluid Rankine cycle circuit.
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