CN103195518A - ORC (organic Rankine cycle) power generation system based on series connection of multistage evaporators - Google Patents
ORC (organic Rankine cycle) power generation system based on series connection of multistage evaporators Download PDFInfo
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- CN103195518A CN103195518A CN2013100886056A CN201310088605A CN103195518A CN 103195518 A CN103195518 A CN 103195518A CN 2013100886056 A CN2013100886056 A CN 2013100886056A CN 201310088605 A CN201310088605 A CN 201310088605A CN 103195518 A CN103195518 A CN 103195518A
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Abstract
The invention discloses an ORC power generation system based on series connection of multistage evaporators. The system comprises n evaporators , wherein the n evaporators are connected in series sequentially on a heat source side; a heat source fluid enters a first evaporator, is discharged from a last evaporator and is recharged to the underground; a working medium side of each evaporator is connected to n inlets of a steam turbine; an outlet of the steam turbine is sequentially connected with a preheater and a condenser in series; a working medium enters the preheater and the condenser, and then enters the other side of the preheater again and exchanges heat with exhaust steam exhausted by the steam turbine after working; the working medium flowing out of the preheater enters n working medium pumps in a parallel connection manner, and the n working medium pumps are connected to the n evaporators correspondingly, so that the closed cycle of the working medium is formed; a cold source side of the condenser is connected to a cooling water circulation system; a plurality of evaporator heat source sides are in series connection; and the working medium side is directly connected with the steam turbine in parallel, so that the defect that a single evaporator in a conventional ORC system is irreversible and has large loss is overcome, and the utilization efficiency and the technical economy of the system are improved.
Description
Technical field
The invention belongs to Thermal Power Engineering Field, relate generally to a kind of thermoelectric conversion system device that adopts the organic Rankine endless form.
Background technique
The organic Rankine circulation is to utilize organic substance working medium as a kind of mode of thermodynamic cycle, with geothermal power, solar energy or other low-grade heat source, promotes the Turbo-generator Set generating thereby organic working medium is heated generation steam.Organic Rankine circulation (Organic Rankine Cycle, abbreviation ORC) temperature of heat source fluid entrance is usually more than 80 ℃, vaporizer is the parts that produce the irreversible loss maximum among the ORC, especially import and export under the enthalpy drop condition with higher at heat source fluid, the irreversible loss of vaporizer will further increase.Therefore multi-stage evaporator reasonably is set, heat source fluid is connected with vaporizers at different levels, make liquid refrigerant in vaporizers at different levels, be heated to be the saturated or superheated vapor of different pressures, realize temperature coupling good between thermal source and the working medium thus.The present invention be directed to the inefficient problem of ORC and propose, can obviously improve generating efficiency and the Technological Economy of system thus.
Summary of the invention
The objective of the invention is, a kind of organic Rankine cycle generating system based on the multi-stage evaporator series connection is provided, for the heat source fluid of big enthalpy drop, multi-stage evaporator is carried out parallel connection, to remedy the bigger problem of ORC mode vaporizer irreversible loss, reach the purpose that improves generating efficiency.
In order to realize above-mentioned target, the present invention has taked following technical solution: based on the organic Rankine cycle generating system of multi-stage evaporator series connection, comprise: vaporizer, steam turbine, generator, preheater, condenser and working medium pump, its set of systems becomes: n vaporizer heat source side is connected in series successively, heat source fluid enters from first vaporizer, discharges from the vaporizer heat source side of least significant end then and recharges; The working medium side of each vaporizer all is connected to n entrance of steam turbine, Steam Turbine Driven generator for electricity generation.Steam turbine outlet is connected in series preheater and condenser successively, and the working medium after the acting enters the opposite side that enters preheater behind preheater and the condenser again, carries out heat exchange with the exhaust steam that acting back steam turbine is discharged.The working medium that flows out from preheater enters n working medium pump with parallel way, and n working medium pump correspondence is connected to the working medium side of n vaporizer.Be that each vaporizer all is furnished with working medium pump, working medium is to supply with each vaporizer with parallel way, constitutes the closed-circuit of working medium thus.
Because for the ORC power generation system that adopts pure matter (single constituent element working medium) organic working medium, the heat source fluid inlet temperature is more high, the irreversible loss that vaporizer produces in the system is more big, so adopt the structure of multi-stage evaporator heat source side series connection, can reduce the inlet temperature of each vaporizer heat source fluid relatively, the irreversible loss that vaporizer produces can remedy.
The beneficial effect of characteristics of the present invention and generation is: (1) hot fluid is connected with n vaporizer heat source side, then the working medium side of each vaporizer directly and steam turbine be connected in parallel, reduce the bigger defective of single vaporizer irreversible loss in the traditional ORC system, improved utilization ratio and the Technological Economy of system; (2) each vaporizer all is furnished with working medium pump to overcome the pressure reduction between the evaporating pressure and condensing pressure in each vaporizer, makes that the temperature matching of heat source fluid and working medium is better; (3) with geothermal power, solar energy or other low-grade energy thermal source as system, on environmentally friendly basis, can reach the purpose that meets energy-saving and emission-reduction.
Description of drawings
Shown in accompanying drawing be know-why of the present invention and system unit connection diagram.
Embodiment
Below in conjunction with accompanying drawing and by embodiment know-why of the present invention and system's composition structure are further described.Need to prove that present embodiment is narrative but not determinate, does not limit protection scope of the present invention with this.
Organic Rankine cycle generating system based on the multi-stage evaporator series connection, its system forms structure: n vaporizer 1-1,1-2 ... 1-n, heat source side is connected in series successively, and heat source fluid enters from first vaporizer 1-1, discharges from the vaporizer 1-n heat source side of least significant end then and recharges; The working medium side of each vaporizer all is connected to n entrance of steam turbine 2,3 generatings of Steam Turbine Driven generator.Steam turbine outlet is connected in series preheater 4 and condenser 5 successively, and the working medium after the acting enters the opposite side that enters preheater behind preheater and the condenser again, carries out heat exchange with the exhaust steam that acting back steam turbine is discharged.The working medium that flows out from preheater with parallel way enter n working medium pump 6-1 ... 6-n, n working medium pump correspondence is connected to the working medium side of n vaporizer.The low-temperature receiver side joint of condenser is to cooling water recirculation system.
This system is applicable to heat source fluid in the bigger design conditions of the outlet enthalpy difference of the import of first vaporizer and n vaporizer, and heat source fluid in the difference of the inlet temperature of first vaporizer and condenser cooling water inlet temperature greater than more than 50 ℃.Consider the feasibility of system's actual motion, n is not more than 4.
Present embodiment adopts two vaporizers and two working medium pumps (being n=2), and heat source fluid is geothermal water.Its working procedure is: temperature is that 110 ℃ geothermal water is introduced into first vaporizer and working medium is carried out heat exchange, geothermal water temperature after the heat exchange is reduced to 83 ℃, enter second vaporizer then, the geothermal water temperature is reduced to 50 ℃ after the heat exchange, and this geothermal water is discharged by second vaporizer fluid side and recharged to underground.Working medium undergoes phase transition in first vaporizer, and pressure is the saturated vapour of 0.56MPa by the liquid phase-change of 0.18MPa.Working medium is that the liquid phase-change of 0.18MPa is the saturated vapour of 0.32MPa by pressure in second vaporizer.Phase-change working substance parallel connection in two vaporizers enters the Steam Turbine Driven generator for electricity generation.(saturated air) working medium of latter two vaporizer of doing work is introduced into preheater, enters condenser then and carries out condensation.The working medium of coming out from condenser enters preheater again, and the purpose that preheater is set is that the exhaust steam heat that utilizes steam turbine to discharge carries out preheating to the working medium that enters vaporizer, can improve the usefulness of vaporizer thus.Be divided into two-way through the working medium after the preheating and be input to separately vaporizer by two working medium pumps respectively.By the overheated or saturated vapour pushing turbine acting that two vaporizers produce, obviously reduced the irreversible loss that the single vaporizer of ORC power generation system produces.
Claims (2)
1. based on the organic Rankine cycle generating system of multi-stage evaporator series connection, comprise: vaporizer, steam turbine, generator, preheater, condenser and working medium pump, it is characterized in that: n vaporizer (1-1,1-2 ... 1-n) heat source side is connected in series successively, heat source fluid enters from first vaporizer (1-1), discharges from vaporizer (1-n) heat source side of least significant end then and recharges; The working medium side of each vaporizer all is connected to n entrance of steam turbine (2), Steam Turbine Driven generator (3) generating, the steam turbine outlet is connected in series preheater (4) and condenser (5) successively, working medium after the acting enters the opposite side that enters preheater behind preheater and the condenser again, carry out heat exchange with the exhaust steam that acting back steam turbine is discharged, the working medium that flows out from preheater with parallel way enter n working medium pump (6-1,6-2 ... 6-n), n working medium pump correspondence is connected to the working medium side of n vaporizer, constitutes the closed-circuit of working medium thus.
2. according to the described organic Rankine cycle generating system of connecting with working medium pump based on multi-stage evaporator of claim 1, it is characterized in that the low-temperature receiver side joint of described condenser (5) is to cooling water recirculation system.
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| CN2013100886056A CN103195518A (en) | 2013-03-20 | 2013-03-20 | ORC (organic Rankine cycle) power generation system based on series connection of multistage evaporators |
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| CN2013100886056A CN103195518A (en) | 2013-03-20 | 2013-03-20 | ORC (organic Rankine cycle) power generation system based on series connection of multistage evaporators |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103615310A (en) * | 2013-12-09 | 2014-03-05 | 天津大学 | Recombination device for internal combustion engine cooling cycle and exhaust energy recovery ORC and control method |
| CN111042885A (en) * | 2019-12-25 | 2020-04-21 | 中国船舶重工集团公司第七一一研究所 | Power generation system and power generation method for recovering waste heat at different temperature levels |
| IT201900006589A1 (en) * | 2019-05-07 | 2020-11-07 | Turboden Spa | OPTIMIZED ORGANIC CASCADE RANKINE CYCLE |
| CN112384680A (en) * | 2018-07-06 | 2021-02-19 | 陈正洪 | ORC power generation device |
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| JPS5246244A (en) * | 1975-10-08 | 1977-04-12 | Ishikawajima Harima Heavy Ind Co Ltd | Waste heat recovery system |
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Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN103615310A (en) * | 2013-12-09 | 2014-03-05 | 天津大学 | Recombination device for internal combustion engine cooling cycle and exhaust energy recovery ORC and control method |
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| US11802494B2 (en) * | 2019-05-07 | 2023-10-31 | Turboden S.p.A. | Optimized cascade organic Rankine cycle |
| CN111042885A (en) * | 2019-12-25 | 2020-04-21 | 中国船舶重工集团公司第七一一研究所 | Power generation system and power generation method for recovering waste heat at different temperature levels |
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Application publication date: 20130710 |