CN103075216A - Brayton-cascade steam Rankine combined cycle power generation system - Google Patents
Brayton-cascade steam Rankine combined cycle power generation system Download PDFInfo
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- 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
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Abstract
The invention relates to a Brayton-cascade steam Rankine combined cycle power generation system. The gas exhaust of a Brayton cycle is adopted as a heat source for a high-temperature end steam Rankine cycle, a steam condenser in a high-pressure end steam Rankine cycle is adopted as one of heat sources for a low-pressure end steam Rankine cycle, the latent heat of vaporization of the steam in the high-pressure end steam Rankine cycle is efficiently recovered to be used for power generation in the low-pressure end steam Rankine cycle, consequently, the load of the steam condenser of the conventional steam Rankine cycle system can be effectively reduced by more than absolute 20 percent, and by adopting a system optimization technique, the absolute thermal efficiency of the cycles of the whole system can be increased by more than 5 percent. The Brayton-cascade steam Rankine combined cycle power generation system not only can be used in the energy-saving alteration of conventional units, but also can be used in the design and construction of new units, and economic, social and environmental protection benefits are remarkable.
Description
Technical field
The present invention relates to a kind of Boulez pauses-superposition type steam Rankine combined cycle generating unit, specifically belong to the thermal power plant field of power equipment technology.
Background technique
Combustion gas one Steam Combined Cycle is because of series of advantages such as its thermal efficiency are high, toggle speed is fast, environmental protection condition good, installation period is short, investment cost is low, add the in recent years develop rapidly of gas turbine technology, the gas turbine single-machine capacity also continues to increase, and combined cycle research has caused attention and the enforcement of countries in the world.
The research of external combined cycle generation technology starts from eighties of last century end of the sixties, development through decades, at present, the combustion gas one steam combined cycle power generating technology of many developed countries such as the U.S., Britain, Japan is comparative maturity, and its power supply efficiency reaches more than 50%.Be about 53% such as U.S. CE company; ABB AB is 48%～51.9%; Mitsubishi Heavy Industries Ltd are 5l%～52%.Many companies (such as U.S. Texco company, Belgian CMI company etc.) all have combined cycle exhaust heat boiler performance design, system optimization, structure optimization, the manufacturing technology of comparative maturity, and on top of thermodynamic property and the roadability of combined cycle exhaust heat boiler.Gas-steam Combined Cycle and at present two-fluid circulation-steam injected gas turbine just under development Cheng's cycle and circulate in the backheat of the blower outlet water-spraying evaporation of gas turbine, the just representative of this technical development, the former is full-fledged, obtained huge economic benefit, both are stepping up among the research afterwards, and the existing application example of Cheng's cycle and formal product.
Thermal power plant take water vapor as working medium is to carry out on a large scale heat energy is transformed into mechanical energy, and the factory that transforms mechanical energy into electricity again.The circulation that the power station is used is very complicated, yet in essence, the Rankine cycle that mainly is comprised of equipment such as boiler, steam turbine, vapour condenser, water pumps is finished, its working principle is: feedwater is sent into boiler first after the feed water pump pressurization, water is heated the superheated vapor of vaporization, formation High Temperature High Pressure in boiler, the superheated vapor acting of in steam turbine, expanding, become the exhaust steam of low-temp low-pressure, enter at last vapour condenser and be condensed into condensed water, again through water pump condensed water is sent into boiler and carry out new circulation.The complex loops of using as for the thermal power plant only on the Rankine cycle basis, in order to improve the thermal efficiency, is improved and the new circulation that forms is backheat circulation, reheat vapor cycle etc., and Rankine cycle has become the basic circulation of modern steam power plant.
Modern big-and-middle-sized steam power plant all adopts the draw gas circulation of heated feed water backheat, steam reheat vapor cycle technology without any exception, thereby improved the heating mean temperature, except having improved significantly thermal efficiency of cycle, though specific steam consumption increases to some extent, but owing to draw gas step by step the steam discharge rate is reduced, this is conducive to the internal efficiency ratio η of i.e. this circulation of ratio of actual acting amount and theoretical acting amount
OiRaising, solved simultaneously the difficulty of large steam turbine exhaust stage blade negotiability restriction, the 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 off, namely wasted heat, caused thermo-pollution, wasted again electric energy, water resources.The a large amount of latent heat of vaporization that discharges when therefore how effectively to utilize steam condensation in the vapour condenser is worth further investigation.
Give off a large amount of low-temperature flue gas in the station boiler production process, wherein the heat of recoverable is a lot.Although this part residual heat resources waste is huge, recycling has larger difficulty, and its main cause is: the quality of (1) waste heat is lower, does not find the method for effectively utilizing; (2) reclaim this part waste heat, often the original thermodynamic system of boiler is made larger change, have certain risk; (3) thermal balance question is difficult to tissue, is difficult to all directly utilize in inside plants, often needs outwards to seek suitable hot user, and hot user often have fluctuation with heat load, thereby limited the versatility of recovery method.
Therefore how to utilize the thermomechanics basic law in steam Rankine cycle, Gas-steam Combined Cycle, Cheng's cycle thermal power plant, reservation is based on the advantage of the power plant technology of Rankine cycle principle, it is theoretical to inquire into new combined cycle, really find the new way that increases substantially the combined circulation power apparatus thermal efficiency, become the difficult point of this area research.
Summary of the invention
The problem that purpose of the present invention exists for solving above-mentioned steam Rankine cycle and combined cycle generating unit, a kind of new thermal power plant's combined cycle flow process is proposed, be that Boulez pauses-superposition type steam Rankine combined cycle generating unit, can be in the advantage that keeps traditional steam Rankine cycle technology, significantly reclaim the latent heat of vaporization of traditional steam Rankine cycle vapour condenser, the load of traditional Rankine cycle vapour condenser is alleviated by a relatively large margin, in the situation of identical generated energy, the absolute amplitude value that alleviates can reach 20%, thereby realize the thermal efficiency of the whole Combined Cycle Unit of Effective Raise, finally reach energy-saving and cost-reducing, improve the purpose of system thermal efficiency.
The objective of the invention is to realize by following measures:
A kind of Boulez pauses-superposition type steam Rankine Rankine combined cycle cogeneration device, and this device comprises Boulez pause circulation, the Rankine cycle of high voltage terminal steam, low voltage terminal steam Rankine cycle system, it is characterized in that:
The high-temperature flue gas 27 that described gas turbine 26 is discharged is as the thermal source of superposition type steam Rankine cycle system, and high-temperature flue gas 27 is discharged after exhaust heat boiler body 1, low-pressure superheater 15, high-pressure superheater 3, high-pressure feed-water heater 8, low-pressure feed heater 11 coolings along flue 22.
The Rankine cycle of described high voltage terminal steam refers to by exhaust heat boiler body 1 saturated vapour 2 out, forms high pressure superheated steam 3-1 through high-pressure superheater 3, sends into high-pressure turbine 4 and drives the generator generating; High-pressure turbine 4 exhaust steam out condenses into water of condensation 6 at high pressure vapour condenser 5, water of condensation 6 is sent into high-pressure feed-water heater 8, exhaust heat boiler body 1 through high pressure water pump 7, exhaust heat boiler body 1 produces saturated vapour again, thereby forms high voltage terminal steam Rankine cycle loop.
The Rankine cycle of described low voltage terminal steam refers to by low pressure evaporator 14 steam out, forms low-pressure superheated steam 16 through low-pressure superheater 15, sends into low-pressure turbine 17 and drives the generator generating; Low-pressure turbine 17 exhaust steam out condenses into low voltage terminal water of condensation 9 at low pressure vapour condenser 18, water of condensation 9 is through condensate pump 10, low-pressure feed heater 11, oxygen-eliminating device 12, low pressure feed water pump 13, send into low pressure evaporator 14, low pressure evaporator 14 produces steam again, thereby forms low voltage terminal steam Rankine cycle loop.
The steam condensation side of described high pressure vapour condenser 5 adopts the operation under positive pressure mode, i.e. the pressure of high-pressure turbine 4 exhaust steam out is higher than atmospheric pressure.
The high pressure vapour condenser 5 in described high voltage terminal steam Rankine cycle loop is the low pressure evaporator 15 in low voltage terminal steam Rankine cycle loop, thereby the Rankine cycle of temperature end steam and low-temperature end steam Rankine cycle organic composite are in the same place, and the latent heat of vaporization that discharges during the steam-condensation of high efficiente callback temperature end steam Rankine cycle is used for low-temperature end steam Rankine cycle generating.
When described low-pressure feed heater 11 adopted the separated type heat exchange mode with flue gas, low-pressure feed heater was compound phase change heat exchanger, comprises vaporizer 11-1, condenser 11-2, and vaporizer 11-1 and condenser adopt the structure of split type or integral type; Phase-change working substance wherein adopts water or other suitable materials; Phase-change working substance absorbs the heat generation saturated vapour of flue gas in vaporizer 11-1, saturated vapour is by condenser 11-2 and low voltage terminal water of condensation 9 wall-type heat exchanges, form condensation water is absorbed flue gas again by vaporizer 11-1 heat generation steam after the cooling, thereby form the inner cyclic process of phase-change working substance; Phase-change working substance adopts natural circulation or pump circulation mode; Preferred method is the split type layout of vaporizer, condenser, and namely vaporizer 11-1 is arranged in the flue 22, condenser 11-2 is arranged in outside the flue, and phase-change working substance adopts water, adopts natural circulation mode.
Be provided with the water charging system supporting with superposition type steam Rankine combined cycle generating unit, enter oxygen-eliminating device 12, the consumption of replenishment system through the qualified moisturizing of Water Treatment; Be provided with the moisturizing loop of high voltage terminal steam Rankine cycle: the low pressure feed water after oxygen-eliminating device 12 deoxygenations fills into high voltage terminal steam Rankine cycle system through high voltage terminal small pump 20, high voltage terminal moisturizing pipeline.
Described high-pressure feed-water heater 8, high pressure vapour condenser 5(are low pressure evaporator 14), low-pressure feed heater 11, high-pressure superheater 3, low-pressure superheater 15 can arrange respectively one or morely, adopts series, parallel or series-parallel connection mode to connect.
Described low voltage terminal vapour condenser 18 arranges according to routine techniques, adopts water or air etc. as cooling medium.
The heat-exchanging element of mentioned aforementioned device can adopt tubulation, fin tube, coiler or spiral groove pipe among the present invention, or adopts the pipe of other augmentation of heat transfer measures or the hollow cavity heat-exchanging element of other patterns.
The a little higher than flue gas acid dew point temperature of wall surface temperature of the vaporizer 11-1 heat exchanger surface of control low-pressure feed heater 11, or the cold end corrosion of adopting corrosion-resistant material effectively to alleviate flue gas, can effectively reduce temperature of exhaust fume, avoid flue gas low-temperature corrosion time, the high efficiente callback fume afterheat.
Unaccounted equipment and standby system thereof, pipeline, instrument, valve among the present invention, be incubated, have the known mature technologies of employing such as regulatory function bypass facility and carry out supporting.
Be provided with safety, regulating controller with system support of the present invention, adopt the known Mature Regulation technology of existing steam Rankine cycle power station, Cheng's cycle power station or gas-steam combined cycle power plant to carry out supporting, make Boulez pause-superposition type steam Rankine combined cycle generating unit can economy, safety, high thermal efficiency operation, reaches energy-saving and cost-reducing purpose.
The present invention has following advantage compared to existing technology:
1, the Boulez of the present invention's design pauses-superposition type steam Rankine combined cycle generating unit, be different from traditional gas-steam combined cycle system, wherein the high pressure vapour condenser 5 steam-condensation sides of high voltage terminal steam Rankine cycle adopt the operation under positive pressure mode, with the steam discharge of high-pressure turbine 4 as one of thermal source of low voltage terminal steam Rankine cycle, with low pressure evaporator 14 ingenious being combined with each other in high pressure vapour condenser 5 and the Rankine cycle of low voltage terminal steam, the latent heat of vaporization of steam all is utilized effectively in the Rankine cycle of high voltage terminal steam, compare the load with the low voltage terminal vapour condenser of the unit of generated output, the absolute amplitude value that the load of vapour condenser alleviates can reach 40%, and the absolute efficiency value of whole system circulation can improve more than 3% at least; Because the back pressure employing malleation mode of high voltage terminal steam Rankine cycle steam turbine is moved, high-pressure turbine outlet exhaust steam can guarantee certain degree of superheat, in the constant situation of high voltage terminal superheat steam temperature, can further improve thermal efficiency of cycle more than 2% by the method for suitable raising high voltage terminal steam first pressing, and because the specific volume of steam turbine outlet exhaust steam diminishes, reduced the size of equipment.
2, the equipment of steam Rankine cycle system and capital investment decrease, and the operating cost of whole Combined Cycle Unit reduces significantly:
(1) vapour condenser of high voltage terminal steam Rankine cycle system is owing to adopt the operation under positive pressure mode, eliminated that traditional negative pressure operation technique inevitably leaks gas, water leakage phenomenon, the feedwater deaeration load of the oxygen-eliminating device of supporting whole Rankine cycle system significantly alleviates, the deaeration plant capacity is little, compare the large high-rise arrangement space of traditional oxygen-eliminating device, required space is little, and flexible arrangement is convenient;
(2) much smaller than traditional vapour condenser of low pressure vapour condenser, the absolute amplitude value reduces about 40%.
3, the low-temperature flue gas waste heat of power plant is realized the high efficiente callback utilization: when the heat exchanger that back-end ductwork arranges adopts phase-change heat-exchanger, waste heat that can the high efficiente callback flue gas, when acid dew-point temperature is low, temperature of exhaust fume can be reduced to about 120 ℃, when the phase-change heat-exchanger vaporizer adopts resistant material, temperature of exhaust fume can reduce more, reach about 85 ℃, operation to system for desulfuration and denitration is very favourable, when effectively avoiding the flue gas low-temperature corrosion, the heat that reclaims is used for the Rankine cycle system efficiency power generation, more meets the cascaded utilization of energy principle.
4, safety in operation obviously improves:
(1) the high-pressure steam turbine operation under positive pressure of high voltage terminal steam Rankine cycle, outlet steam is superheated vapor, than the unit that adopts the reheat vapor cycle technology, further low the back of pressure, thereby multiple electricity, the operating conditions of steam turbine is optimized; Low-pressure superheater in the Rankine cycle of low voltage terminal steam, because pressure is lower, safety in operation improves; The admission of low-pressure turbine is adopted through hot again superheated vapor, can effectively increase the mass dryness fraction of low-pressure turbine steam discharge, can effectively solve last stage vane of steam turbine brings because of wet vapor in traditional steam Rankine cycle Design of Problems, manufacturing and operation problem, obviously improve before the vibration of steam turbine generator set.
(2) the oxygen corrosion Safety performance of high pressure side steam Rankine cycle steam generator system is obviously improved, and has alleviated traditional steam electric power unit because of the operation of vapour condenser negative pressure, and air unavoidably bleeds and the oxygen corrosion that service system causes is endangered.
5, the solution of the present invention both can be used for design, the construction of newly-built power plant system, also can be used for the reducing energy consumption to existing Rankine cycle unit, energy is the potentiality of excavating device fully, vitalize existing assets, the industrial policy that meets simultaneously country, economical, the Security of unit operation obtain Reliable guarantee, the thermal efficiency of energy Effective Raise system.
Description of drawings
Fig. 1 is that a kind of Boulez of the present invention pauses-superposition type steam Rankine combined cycle generating unit schematic flow sheet.
Among Fig. 1: 1-boiler body, 2-saturated vapour, 3-high-pressure superheater, the 3-1-high pressure superheated steam, 4-high-pressure steam turbine, 5-high pressure vapour condenser, the 6-water of condensation, 7-high pressure water pump, 8-high-pressure feed-water heater, the 9-low pressure condensate water, 10-condensate pump, 11-low-pressure feed heater, the 11-1-vaporizer, 11-2-condenser, 12-oxygen-eliminating device, 13-low pressure feed water pump, 14-low voltage terminal vaporizer, 15-low-pressure superheater, the 16-low-pressure superheated steam, 17-low-pressure turbine, 18-low pressure vapour condenser, the 19-generator, 20-high voltage terminal small pump, 21-high voltage terminal moisturizing pipeline, the 22-flue, the 23-air, 24-gas compressor, 25-fuel-burning equipment, the 26-gas turbine, the 27-high-temperature flue gas, 28-fuel, 29-gas turbine powered generator.
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 Boulez pauses-superposition type steam Rankine combined cycle cogeneration device, and this device comprises Boulez pause circulation, the Rankine cycle of high voltage terminal steam, the Rankine cycle of low voltage terminal steam:
The Rankine cycle of described high voltage terminal steam refers to by exhaust heat boiler body 1 saturated vapour 2 out, forms high pressure superheated steam 3-1 through high-pressure superheater 3, sends into high-pressure turbine 4 and drives the generator generating; High-pressure turbine 4 exhaust steam out condenses into water of condensation 6 at high pressure vapour condenser 5, water of condensation 6 is sent into high-pressure feed-water heater 8, exhaust heat boiler body 1 through high pressure water pump 7, exhaust heat boiler body 1 produces saturated vapour again, thereby forms high voltage terminal steam Rankine cycle loop.
The Rankine cycle of described low voltage terminal steam refers to by low pressure evaporator 14 steam out, forms low-pressure superheated steam 16 through low-pressure superheater 15, sends into low-pressure turbine 17 and drives the generator generating; Low-pressure turbine 17 exhaust steam out condenses into low voltage terminal water of condensation 9 at low pressure vapour condenser 18, water of condensation 9 is through condensate pump 10, condenser 11-2, oxygen-eliminating device 12, low pressure feed water pump 13, send into low pressure evaporator 14, low pressure evaporator 14 produces steam again, thereby forms low voltage terminal steam Rankine cycle loop.
The steam condensation side of described high pressure vapour condenser 5 adopts the operation under positive pressure mode, i.e. the pressure of high-pressure turbine 4 exhaust steam out is higher than atmospheric pressure.
The high pressure vapour condenser 5 in described high voltage terminal steam Rankine cycle loop is the low pressure evaporator 15 in low voltage terminal steam Rankine cycle loop, thereby the Rankine cycle of temperature end steam and low-temperature end steam Rankine cycle organic composite are in the same place, and the latent heat of vaporization that discharges during the steam-condensation of high efficiente callback temperature end steam Rankine cycle is used for low-temperature end steam Rankine cycle generating.
The high-temperature flue gas 27 that described gas turbine 26 is discharged is as the thermal source of superposition type steam Rankine cycle system, and high-temperature flue gas 27 is discharged after the vaporizer 11-1 of exhaust heat boiler body 1, low-pressure superheater 15, high-pressure superheater 3, high-pressure feed-water heater 8, low-pressure feed heater 11 cooling along flue 22.
Described low-pressure feed heater 11 adopts the separated type heat exchange mode with flue gas, be compound phase change heat exchanger, comprise vaporizer 11-1, condenser 11-2, vaporizer 11-1 is arranged in the flue 22, condenser 11-2 is arranged in outside the flue, phase-change working substance adopts water, adopts natural circulation mode.Phase-change working substance absorbs the heat generation saturated vapour of flue gas in vaporizer 11-1, saturated vapour is by condenser 11-2 and low voltage terminal water of condensation 9 wall-type heat exchanges, form condensation water is absorbed flue gas again by vaporizer 11-1 heat generation steam after the cooling, thereby form the inner cyclic process of phase-change working substance.
Be provided with the water charging system supporting with superposition type steam Rankine combined cycle generating unit, enter oxygen-eliminating device 12 through the qualified moisturizing of Water Treatment, replenish the consumption of whole Rankine cycle system feedwater; Be provided with the moisturizing loop of high voltage terminal steam Rankine cycle: the make-up water that 13 outlets of low pressure feed water pump are drawn fills into the inlet line of the high pressure water pump 7 of high voltage terminal steam Rankine cycle system through high voltage terminal small pump 20, high voltage terminal moisturizing pipeline.
Described high-pressure feed-water heater 8, high pressure vapour condenser 5(are low pressure evaporator 14), low-pressure feed heater 11, high-pressure superheater 3, low-pressure superheater 15 can arrange respectively one or morely, adopts series, parallel or series-parallel connection mode to connect.
Described low voltage terminal vapour condenser 18 arranges according to routine techniques, adopts water as cooling medium.
The heat-exchanging element of mentioned aforementioned device can adopt tubulation, fin tube, coiler or spiral groove pipe among the present invention, or adopts the pipe of other augmentation of heat transfer measures or the hollow cavity heat-exchanging element of other patterns.
The a little higher than flue gas acid dew point temperature of wall surface temperature of the vaporizer 11-1 heat exchanger surface of control low-pressure feed heater 11, or the cold end corrosion of adopting corrosion-resistant material effectively to alleviate flue gas, can effectively reduce temperature of exhaust fume, avoid flue gas low-temperature corrosion time, the high efficiente callback fume afterheat.
Unaccounted equipment and standby system thereof, pipeline, instrument, valve among the present invention, be incubated, have the known mature technologies of employing such as regulatory function bypass, safety protection device and carry out supporting.
Be provided with safety, regulating controller with system support of the present invention, adopt the known Mature Regulation technology of existing steam Rankine cycle power station, Cheng's cycle power station or gas-steam combined cycle power plant to carry out supporting, make superposition type steam Rankine combined cycle generating unit energy economy, safety, high thermal efficiency operation, reach energy-saving and cost-reducing purpose.
Although the present invention with preferred embodiment openly as above, they are not to limit the present invention, anyly are familiar with this skill person, without departing from the spirit and scope of the invention, certainly when making various changes or retouch, belong to equally the present invention's protection domain.Therefore protection scope of the present invention should with the application claim was defined is as the criterion.
Claims (8)
1. a Boulez pauses-superposition type steam Rankine combined cycle generating unit, and this device comprises Boulez pause circulation, the Rankine cycle of high voltage terminal steam and low voltage terminal organic rankine cycle system, it is characterized in that:
Air (23) is sent into fuel-burning equipment (25) through gas compressor (24), with fully burning of the fuel that enters (28), the high-temperature flue gas that generates enters gas turbine (26), drags gas turbine powered generator (29) generating, finishes the circulation of pausing of gas turbine unit Boulez;
The high-temperature flue gas (27) that described gas turbine (26) is discharged is as the thermal source of superposition type steam Rankine cycle system, and high-temperature flue gas (27) is discharged after the attached heating surface cooling of exhaust heat boiler body (1) and flue (22);
The Rankine cycle of described high voltage terminal steam refers to by exhaust heat boiler body (1) saturated vapour (2) out, forms high pressure superheated steam (3-1) through high-pressure superheater (3), sends into high-pressure turbine (4) and drives generator (19) generating; High-pressure turbine (4) exhaust steam out condenses into water of condensation (6) at high pressure vapour condenser (5), water of condensation (6) is sent into exhaust heat boiler body (1) through high pressure water pump (7), exhaust heat boiler body (1) produces saturated vapour again, thereby forms high voltage terminal steam Rankine cycle loop;
The Rankine cycle of described low voltage terminal steam refers to by low pressure evaporator (14) steam out, forms low-pressure superheated steam (16) through low-pressure superheater (15), sends into low-pressure turbine (17) and drives generator (19) generating; Low-pressure turbine (17) exhaust steam out condenses into low voltage terminal water of condensation (9) at low pressure vapour condenser (18), send into low pressure evaporator (14) through low pressure feed water pump (13), low pressure evaporator (14) produces steam again, thereby forms low voltage terminal steam Rankine cycle loop;
The steam condensation side of described high pressure vapour condenser (5) adopts the operation under positive pressure mode, i.e. the pressure of the exhaust steam of high-pressure turbine (4) discharge is higher than atmospheric pressure;
The high pressure vapour condenser (5) in described high voltage terminal steam Rankine cycle loop is the low pressure evaporator (14) in low voltage terminal steam Rankine cycle loop.
2. device according to claim 1 is characterized in that:
Be provided with high-pressure feed-water heater (8):
Exhaust heat boiler body (1) saturated vapour (2) out, form superheated vapor (3-1) through high-pressure superheater (3), send into high-pressure turbine (4) and drive generator (19) generating, high-pressure turbine (4) exhaust steam out condenses into water of condensation (6) at high pressure vapour condenser (5), water of condensation (6) is sent into high-pressure feed-water heater (8), exhaust heat boiler body (1) through high pressure water pump (7), exhaust heat boiler body (1) produces saturated vapour again, thereby forms high voltage terminal steam Rankine cycle loop.
3. device according to claim 1 is characterized in that:
Be provided with oxygen-eliminating device (12):
The Rankine cycle of described low voltage terminal steam refers to by low pressure evaporator (14) steam out, forms low-pressure superheated steam (16) through low-pressure superheater (15), sends into low-pressure turbine (17) and drives generator (19) generating; Low-pressure turbine (17) exhaust steam out condenses into low voltage terminal water of condensation (9) at low pressure vapour condenser (18), low voltage terminal water of condensation (9) is through condensate pump (10), oxygen-eliminating device (12), low pressure feed water pump (13), send into low pressure evaporator (14), low pressure evaporator (14) produces steam again, thereby forms low voltage terminal steam Rankine cycle loop.
4. device according to claim 3 is characterized in that:
Be provided with low-pressure feed heater (11):
The Rankine cycle of described low voltage terminal steam refers to by low pressure evaporator (14) steam out, forms low-pressure superheated steam (16) through low-pressure superheater (15), sends into low-pressure turbine (17) and drives generator (19) generating; Low-pressure turbine (17) exhaust steam out condenses into low voltage terminal water of condensation (9) at low pressure vapour condenser (18), water of condensation (9) is through condensate pump (10), low-pressure feed heater (11), oxygen-eliminating device (12), low pressure feed water pump (13), send into low pressure evaporator (14), low pressure evaporator (14) produces steam again, thereby forms low voltage terminal steam Rankine cycle loop.
5. device according to claim 3 is characterized in that:
Be provided with high voltage terminal Rankine cycle moisturizing loop: the feedwater of the low voltage terminal steam Rankine cycle of oxygen-eliminating device (12) outlet fills into boiler body (1) through high voltage terminal small pump (20), high voltage terminal moisturizing pipeline (21).
6. device according to claim 4 is characterized in that:
Described low-pressure feed heater (11) adopts dividing wall type or separated type heat exchange mode with flue gas.
7. device according to claim 6 is characterized in that:
Described low-pressure feed heater (11) adopts the separated type heat exchange mode with flue gas, comprises vaporizer (11-1), condenser (11-2); Vaporizer (11-1) is arranged in fume side, follow the flue gas wall-type heat exchange by phase-change working substance, the phase-change working substance heat absorption produces steam, steam is by the feedwater wall-type heat exchange of condenser (11-2) with the Rankine cycle of low voltage terminal steam, form condensation water is absorbed flue gas again by vaporizer (11-1) heat generation steam after the cooling, thereby form the inner cyclic process of phase-change working substance.
8. it is characterized in that according to claim 2 or 4 described devices:
Described high-pressure superheater (3), low-pressure superheater (15), high-pressure feed-water heater (8), low-pressure feed heater (11), high pressure vapour condenser (5) and low pressure evaporator (14) can arrange one or more, adopt series, parallel or series-parallel connection mode to connect.
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| CN107143403A (en) * | 2017-04-19 | 2017-09-08 | 清华大学 | Hydrogen gas turbine waste heat from tail gas utilizes system |
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