CN103527268A - Double-stage full-flow screw expander organic Rankine cycle system - Google Patents
Double-stage full-flow screw expander organic Rankine cycle system Download PDFInfo
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- CN103527268A CN103527268A CN201310508750.5A CN201310508750A CN103527268A CN 103527268 A CN103527268 A CN 103527268A CN 201310508750 A CN201310508750 A CN 201310508750A CN 103527268 A CN103527268 A CN 103527268A
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Abstract
Provided is a double-stage full-flow screw expander organic Rankine cycle system. The double-stage full-flow screw expander organic Rankine cycle system comprises a condenser, a working medium pump, an evaporator and a first-stage screw expander, wherein the condenser, the working medium pump, the evaporator and the first-stage screw expander are connected in sequence through pipelines, an outlet of the first-stage screw expander is connected with an inlet of a gas-liquid separator through a pipeline, the gas-liquid separator is provided with a liquid phase outlet and a gas phase outlet, the liquid phase outlet and the gas phase outlet of the gas-liquid separator are connected with an inlet of a gas-liquid blending tank through pipelines and a second-stage expander subsystem, and an outlet of the gas-liquid blending tank is connected with an inlet of the condenser through a pipeline. According to the double-stage full-flow screw expander organic Rankine cycle system, on the situation that the area of the evaporator of the double-stage full-flow screw expander organic Rankine cycle system is not increased, organic working media can obtain a large expansion ratio in the process of overall expansion acting, and overall cycle efficiency and overall economic benefit of a thermodynamic cycle system are improved.
Description
Technical field
The present invention relates to a kind of organic Rankine circulation system.Particularly relate to a kind of twin-stage full-flow screw decompressor organic rankine cycle system based on full-flow screw decompressor.
Background technique
Organic rankine cycle system is to take low-boiling-point organic compound as working medium heating power circulating technology.Its basic functional principle be organic working medium in vaporizer with thermal source heat exchange, produce organic steam, and then promote decompressor or steam turbine acting, and drive generator to generate electricity or outputting power, weary gas is cooled to liquid state in condenser, then sends into vaporizer by recycle pump, thereby completes a circulation.Due to the use of low boiling organic working medium, this power system is lower to conditional requests such as the temperature of thermal source, pressure, is therefore applicable to industrial afterheat recovery, the occasions such as middle low-grade utility of the renewable energy sourcess such as underground heat, solar energy.
Screw expander is a kind of positive-displacement expansion engine.It does not have the slide members such as air valve, piston, so its good manufacturability, and refrigerant flow rate is large, can run up reposefully, is a kind of good hot merit conversion equipment.Compare with other forms of decompressor, the feature of screw expander maximum is that in its running, internal working medium can be gas-liquid two-phase flow, therefore also can be called full-flow screw decompressor.
At present occurred that screw expander is for the bibliographical information of organic rankine cycle system.In such system, organic working medium fluid can be gaseous state, the even micro-supercooled liquid of saturated liquid state in screw expander ingress.At present, limited by technical merit, the expansion ratio of screw expander is generally 3-5, and now the isentropic efficiency of inflation process can reach 75% left and right.Less expansion ratio can make in screw expander unit volume is controlled at more among a small circle, can save metallic material, reduces costs; But then, less expansion ratio makes delivery temperature, the pressure of decompressor outlet exhaust steam higher, and for organic working medium, now exhaust steam often also has certain acting ability, as can not be further utilized, can reduce the whole efficiency of power system.For addressing this problem, a solution be as patent application publication number be that CN102619567A is disclosed, working medium exhaust steam is introduced to reheater, after intensification, enter again another screw expander.But, for ordinary circumstance, the outlet working medium exhaust steam of first order screw expander is in overheated zone or Gas-liquid phase region, compare with supercooled liquid working medium, its exchange capability of heat reduces, this just causes the heat exchange area of reheater (being vaporizer in essence) very large, has increased the cost of system, has a strong impact on the economic benefit of system.
Summary of the invention
Technical problem to be solved by this invention is, provide a kind of can be in the situation that not increasing system evaporator area, make organic working medium obtain larger expansion ratio in total volumetric expansion acting process, improve the overall cycle efficiency of circulation system and the twin-stage full-flow screw decompressor organic rankine cycle system of economic benefit.
The technical solution adopted in the present invention is: a kind of twin-stage full-flow screw decompressor organic rankine cycle system, include the condenser connecting successively by pipeline, working medium pump, vaporizer and first order screw expander, the outlet of described first order screw expander connects the entrance of gas-liquid separator by pipeline, described gas-liquid separator has liquid-phase outlet and gaseous phase outlet, the liquid-phase outlet of described gas-liquid separator is all connected the entrance of gas-liquid mixed tank with gaseous phase outlet by pipeline and second level decompressor subtense angle, the outlet of described gas-liquid mixed tank connects the entrance of described condenser by pipeline.
Described second level decompressor subtense angle includes second level screw expander, the conventional decompressor in reduction valve and the second level, wherein, the entrance of described second level screw expander connects the liquid-phase outlet of described gas-liquid separator by pipeline, the outlet of described second level screw expander is by pipeline and the liquid phase entrance that is arranged on reduction valve on described this pipeline and is connected described gas-liquid mixed tank, the entrance of the conventional decompressor in the described second level connects the gaseous phase outlet of described gas-liquid separator by pipeline, the outlet of the conventional decompressor in the described second level connects the gas phase entrance of described gas-liquid mixed tank by pipeline.
The conventional decompressor in the described second level is the decompressor of arbitrary type, or steam turbine.
The space position of described gas-liquid separator is higher than the space position of described second level screw expander.
For the interior output revolving shaft that can be converted to the first order screw expander of mechanical energy of High Temperature High Pressure organic working medium is connected to external demand equipment.
For the interior output revolving shaft that can be converted to the conventional decompressor in the second level of mechanical energy of medium temperature and medium pressure gaseous state organic working medium is connected to external demand equipment.
For the interior output revolving shaft that can be converted to the second level screw expander of mechanical energy of the liquid organic working medium of medium temperature and medium pressure is connected to external demand equipment.
Twin-stage full-flow screw decompressor organic rankine cycle system of the present invention, in the situation that not increasing system evaporator area, make organic working medium obtain larger expansion ratio in total volumetric expansion acting process, improve overall cycle efficiency and the economic benefit of circulation system.The beneficial effect of feature of the present invention and generation is as follows:
(1) setting up of second level decompressor subtense angle, can make first order screw expander discharge exhaust steam and further expand, and can increase the bulk expansion ratio of inflation process in organic Rankine circulation.Under equal thermal source and heat transfer boundary condition, can improve the whole hot merit conversion efficiency of organic rankine cycle system;
(2) setting up of gas-liquid separator, is divided into two paths by the second level subtense angle that expands, and flows into respectively saturated liquid refrigerant and saturated gaseous working medium.Thus, use the conventional decompressor in the second level of saturated gaseous working medium can select other forms of decompressor, can reduce system cost;
(3) between gas-liquid separator and second level screw expander, working medium transfer pump is not set, but by space position height difference, utilize gravity supercharging to be used for guaranteeing circulating of liquid refrigerant.Thus, not only can reduce the overall efficiency from wasted work, raising system of system, and can reduce system cost, save investment.
Accompanying drawing explanation
Fig. 1 is that overall structure of the present invention forms schematic diagram;
Fig. 2 is cycle fluid flow chart of the present invention.
In figure
1: first order screw expander 2: gas-liquid separator
3: the conventional decompressor 4 in the second level: second level screw expander
5: reduction valve 6: gas-liquid mixed tank
7: condenser 8: working medium pump
9: vaporizer
Embodiment
Below in conjunction with embodiment and accompanying drawing, twin-stage full-flow screw decompressor organic rankine cycle system of the present invention is described in detail.
As shown in Figure 1, twin-stage full-flow screw decompressor organic rankine cycle system of the present invention, include the condenser 7 connecting successively by pipeline, working medium pump 8, vaporizer 9 and first order screw expander 1, it is characterized in that, the outlet of described first order screw expander 1 connects the entrance of gas-liquid separator 2 by pipeline, described gas-liquid separator 2 has liquid-phase outlet and gaseous phase outlet, the liquid-phase outlet of described gas-liquid separator 2 is all connected the entrance of gas-liquid mixed tank 6 with gaseous phase outlet by pipeline and second level decompressor subtense angle, the outlet of described gas-liquid mixed tank 6 connects the entrance of described condenser 7 by pipeline, so far form a complete working medium circulation path.
Described second level decompressor subtense angle includes second level screw expander 4, the conventional decompressor 3 in reduction valve 5 and the second level, wherein, the entrance of described second level screw expander 4 connects the liquid-phase outlet of described gas-liquid separator 2 by pipeline, and, the space position of described gas-liquid separator 2 is higher than the space position of described second level screw expander 4, space position by the space position of gas-liquid separator 2 higher than described second level screw expander 4, directly use pipeline to connect between the two, utilize like this gravity supercharging to guarantee that liquid refrigerant flows, do not need to arrange separately working medium transfer pump or suction booster.The outlet of described second level screw expander 4 is by pipeline and the liquid phase entrance that is arranged on reduction valve 5 on described this pipeline and is connected described gas-liquid mixed tank 6.The entrance of the conventional decompressor 3 in the described second level connects the gaseous phase outlet of described gas-liquid separator 2 by pipeline, the outlet of the conventional decompressor 3 in the described second level connects the gas phase entrance of described gas-liquid mixed tank 6 by pipeline.The conventional decompressor 3 in the second level of the present invention is decompressors of arbitrary type, or steam turbine.
According to the structure of second level decompressor subtense angle, utilize reduction valve 5, it is identical with the conventional decompressor 3 outlet exhaust steam in the second level that the working medium exhaust steam pressure that second level screw expander 4 is discharged is further reduced to, and all flow into gas-liquid mixed tank 6.
In twin-stage full-flow screw decompressor organic rankine cycle system of the present invention: described for the interior output revolving shaft that can be converted to the first order screw expander 1 of mechanical energy of High Temperature High Pressure organic working medium is connected to external demand equipment; It is described for the interior output revolving shaft that can be converted to the conventional decompressor 3 in the second level of mechanical energy of medium temperature and medium pressure gaseous state organic working medium is connected to external demand equipment; It is described for the interior output revolving shaft that can be converted to the second level screw expander 4 of mechanical energy of the liquid organic working medium of medium temperature and medium pressure is connected to external demand equipment.
The working procedure of sketching twin-stage full-flow screw decompressor organic rankine cycle system of the present invention below with reference to Fig. 1, Fig. 2 is as follows:
Cryogenic high pressure supercooled liquid organic working medium, in vaporizer 9, without illustrated thermal source level pressure, heated, in vaporizer 9 outlet ports, form the saturated liquid refrigerant of High Temperature High Pressure, enter subsequently first order screw expander 1 and carry out full stream expansion acting, pressure, temperature decrease.First order screw expander 1 can be converted to mechanical energy by the interior of High Temperature High Pressure organic working medium, and exports to without illustrated demand equipment by its rotating shaft.
The exhaust steam of medium temperature and medium pressure working medium is gas-liquid two-phase admixture in the outlet of first order screw expander 1, and exhaust steam flows into gas-liquid separator 2 subsequently, and within it part from.Described gas-liquid separator has gas phase and two outlets of liquid phase:
The saturated gaseous working medium of medium temperature and medium pressure enters the conventional decompressor 3 in the second level subsequently.According to organic working medium character, the conventional decompressor 3 in the second level can be the decompressor of any type, also steam turbine.The conventional decompressor 3 in the second level can be converted to mechanical energy by the interior of medium temperature and medium pressure gaseous state organic working medium, and exports to without illustrated demand equipment by its rotating shaft.After compound expansion, working medium in the second level conventional decompressor 3 outlets cross hot gaseous for low-temp low-pressure, with by pipeline inflow gas-liquid mixed tank 6;
The saturated liquid refrigerant of medium temperature and medium pressure flows into second level screw expander 4 through pipeline under Action of Gravity Field.Second level screw expander 4 can be converted to mechanical energy by liquid the interior of organic working medium of medium temperature and medium pressure, and exports to without illustrated demand equipment by its rotating shaft.After compound expansion, working medium is low-temp low-pressure gas-liquid mixed state in 4 outlets of second level screw expander.Because the expansion ratio of second level screw expander 4 is less than the expansion ratio of the conventional decompressor 3 in the second level, therefore, working medium at the pressure of second level screw expander 4 outlets still higher than the conventional decompressor 3 outlet power pressures in the second level.The exhaust steam of second level screw expander 4 outlets, after reduction valve 5 decompression adjustings, flows into gas-liquid mixed tank 6.
The low-temp low-pressure organic working medium that flows into gas-liquid mixed tank 6 through two passages, after gas-liquid mixed tank 6 mixes, flows into condenser 7.In condenser 7, by cooling without illustrated low-temperature receiver level pressure, in condenser 7 outlet ports, form low-temp low-pressure supercooled liquid working medium, enter subsequently working medium pump 8.Through working medium pump 8 superchargings, cryogenic high pressure supercooled liquid organic working medium enters vaporizer 9 again, completes thus a circulation.
In addition, in the present embodiment, the decompression of reduction valve 5 regulates to be controlled, the exhaust pressure of the conventional decompressor 3 in the exhaust pressure based on second level screw expander 4 and the second level, and its control can be in any way.
Claims (7)
1. a twin-stage full-flow screw decompressor organic rankine cycle system, include the condenser (7) connecting successively by pipeline, working medium pump (8), vaporizer (9) and first order screw expander (1), it is characterized in that, the outlet of described first order screw expander (1) connects the entrance of gas-liquid separator (2) by pipeline, described gas-liquid separator (2) has liquid-phase outlet and gaseous phase outlet, the liquid-phase outlet of described gas-liquid separator (2) is all connected the entrance of gas-liquid mixed tank (6) with gaseous phase outlet by pipeline and second level decompressor subtense angle, the outlet of described gas-liquid mixed tank (6) connects the entrance of described condenser (7) by pipeline.
2. twin-stage full-flow screw decompressor organic rankine cycle system according to claim 1, it is characterized in that, described second level decompressor subtense angle includes second level screw expander (4), the conventional decompressor (3) in reduction valve (5) and the second level, wherein, the entrance of described second level screw expander (4) connects the liquid-phase outlet of described gas-liquid separator (2) by pipeline, the outlet of described second level screw expander (4) is by pipeline and the liquid phase entrance that is arranged on reduction valve (5) on described this pipeline and is connected described gas-liquid mixed tank (6), the entrance of the conventional decompressor in the described second level (3) connects the gaseous phase outlet of described gas-liquid separator (2) by pipeline, the outlet of the conventional decompressor in the described second level (3) connects the gas phase entrance of described gas-liquid mixed tank (6) by pipeline.
3. twin-stage full-flow screw decompressor organic rankine cycle system according to claim 2, is characterized in that, the described conventional decompressor in the second level (3) is the decompressor of arbitrary type, or steam turbine.
4. twin-stage full-flow screw decompressor organic rankine cycle system according to claim 2, is characterized in that, the space position of described gas-liquid separator (2) is higher than the space position of described second level screw expander (4).
5. twin-stage full-flow screw decompressor organic rankine cycle system according to claim 1, is characterized in that, for the interior output revolving shaft that can be converted to the first order screw expander (1) of mechanical energy of High Temperature High Pressure organic working medium is connected to external demand equipment.
6. twin-stage full-flow screw decompressor organic rankine cycle system according to claim 2, it is characterized in that, for the interior output revolving shaft that can be converted to the conventional decompressor in the second level (3) of mechanical energy of medium temperature and medium pressure gaseous state organic working medium is connected to external demand equipment.
7. twin-stage full-flow screw decompressor organic rankine cycle system according to claim 2, it is characterized in that, for the interior output revolving shaft that can be converted to the second level screw expander (4) of mechanical energy of the liquid organic working medium of medium temperature and medium pressure is connected to external demand equipment.
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106121754A (en) * | 2016-06-29 | 2016-11-16 | 南京航空航天大学 | Step recycles ORC system and the method for low-grade heat |
| CN107060926A (en) * | 2017-01-25 | 2017-08-18 | 天津大学 | A kind of middle low temperature heat energy combined generating system of utilization two-phase pipe airlift pump |
| CN108425713A (en) * | 2018-05-18 | 2018-08-21 | 江苏大学 | A kind of organic Rankine cycle power generation system based on gas-liquid separation and twin-stage evaporation |
| CN109469524A (en) * | 2018-11-07 | 2019-03-15 | 哈尔滨工程大学 | A kind of UTILIZATION OF VESIDUAL HEAT IN card Linne cycle generating system of optimization and upgrading |
| CN110905619A (en) * | 2019-11-18 | 2020-03-24 | 天津大学 | Mixed working medium Rankine cycle system for recovering waste heat of internal combustion engine |
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| CN102182528A (en) * | 2011-04-21 | 2011-09-14 | 天津大学 | Power system of bicirculating two-level screw expander |
| CN103306764A (en) * | 2013-07-05 | 2013-09-18 | 重庆大学 | Kalina circulating system with two-phase expansion machine |
| CN203531985U (en) * | 2013-10-24 | 2014-04-09 | 天津大学 | Organic Rankine cycle system for double-stage full-flow screw expander |
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2013
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Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
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| US20020095938A1 (en) * | 2001-01-23 | 2002-07-25 | Reginald Wintrell | Systems and methods for harvesting energy from direct iron-making off gases |
| WO2005031123A1 (en) * | 2003-09-25 | 2005-04-07 | City University | Deriving power from a low temperature heat source |
| DE10355782A1 (en) * | 2003-11-26 | 2005-06-30 | Maxxtec Ag | Device for carrying out thermal circulating process comprises using working substance having temperature in primary circulation which is higher than temperature of working substance in secondary circulation |
| CN102182528A (en) * | 2011-04-21 | 2011-09-14 | 天津大学 | Power system of bicirculating two-level screw expander |
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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106121754A (en) * | 2016-06-29 | 2016-11-16 | 南京航空航天大学 | Step recycles ORC system and the method for low-grade heat |
| CN107060926A (en) * | 2017-01-25 | 2017-08-18 | 天津大学 | A kind of middle low temperature heat energy combined generating system of utilization two-phase pipe airlift pump |
| CN108425713A (en) * | 2018-05-18 | 2018-08-21 | 江苏大学 | A kind of organic Rankine cycle power generation system based on gas-liquid separation and twin-stage evaporation |
| CN109469524A (en) * | 2018-11-07 | 2019-03-15 | 哈尔滨工程大学 | A kind of UTILIZATION OF VESIDUAL HEAT IN card Linne cycle generating system of optimization and upgrading |
| CN110905619A (en) * | 2019-11-18 | 2020-03-24 | 天津大学 | Mixed working medium Rankine cycle system for recovering waste heat of internal combustion engine |
| CN110905619B (en) * | 2019-11-18 | 2022-05-03 | 天津大学 | Mixed working medium Rankine cycle system for recovering waste heat of internal combustion engine |
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Application publication date: 20140122 |