CN107035727A - It is a kind of to prevent the device for storing liquid and its application method of ORC electricity generation system pump cavitations - Google Patents
It is a kind of to prevent the device for storing liquid and its application method of ORC electricity generation system pump cavitations Download PDFInfo
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- CN107035727A CN107035727A CN201710481101.9A CN201710481101A CN107035727A CN 107035727 A CN107035727 A CN 107035727A CN 201710481101 A CN201710481101 A CN 201710481101A CN 107035727 A CN107035727 A CN 107035727A
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- working medium
- cooling water
- pump
- pipeline
- electricity generation
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Classifications
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04D—NON-POSITIVE-DISPLACEMENT PUMPS
- F04D29/00—Details, component parts, or accessories
- F04D29/66—Combating cavitation, whirls, noise, vibration or the like; Balancing
- F04D29/669—Combating cavitation, whirls, noise, vibration or the like; Balancing especially adapted for liquid pumps
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04D—NON-POSITIVE-DISPLACEMENT PUMPS
- F04D29/00—Details, component parts, or accessories
- F04D29/58—Cooling; Heating; Diminishing heat transfer
- F04D29/586—Cooling; Heating; Diminishing heat transfer specially adapted for liquid pumps
- F04D29/5866—Cooling at last part of the working fluid in a heat exchanger
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- Thermal Sciences (AREA)
Abstract
The device for storing liquid and its method of work of ORC electricity generation system pump cavitations, including condenser are prevented the present invention relates to a kind of；Condenser is divided into working medium side runner and cooling water flow conduits, by Working fluid flow direction, working medium side runner is connected by pipeline with systematic working medium side entrance and working medium fluid reservoir respectively, working medium fluid reservoir is sequentially connected by pipeline with working medium pump and systematic working medium side outlet, working medium fluid reservoir is internally provided with working medium tank cooling line, by flow of cooling water direction, the entrance point of working medium tank cooling line is connected with cooling water circulating pump and system cooling water side entrance successively by pipeline, the port of export of working medium tank cooling line is connected by pipeline with cooling water flow conduits, cooling water flow conduits are also connected by pipeline with the outlet of system cooling water side；The present invention is controlled by adjusting cooling water flow change heat transfer effect to organic working medium temperature, so as to available NPSH control, cooling water makes the reduction of organic working medium temperature, it is ensured that available NPSH is raised, and solves the problem of cavitation of pump.
Description
Technical field
ORC electricity generation system pumps are prevented the present invention relates to the pump cavitation protection technology field of electricity generation system, more particularly to one kind
The device for storing liquid and its application method of cavitation.
Background technology
To improve energy utilization rate, country proposes " 13 " energy-conserving and environment-protective development plan, actively encourages the waste heat energy
Development and utilization；As domestic emerging thermoelectric generation technology, organic Rankine bottoming cycle (abbreviation ORC) electricity generation system, which has, utilizes heat
Source temperature is low, system working pressure is low, system footprint space is small, skid body is convenient transports and installation, well adapting to property and height
The advantages of effect environmental protection, the focus of domestic waste heat recovery area research is turned at present；
Pump, as the source of organic working medium power, is one of visual plant in ORC electricity generation systems；Actual use process
In, because rotating speed high flow capacity is big, easily there is cavitation phenomenons；The cavitation phenomenons of pump refers to that pump intake medium is at impeller inlet
Because pressure is vaporized as minute bubbles less than the corresponding pressure for vaporization of temperature at this, in flowing pressure change make bubbles burst,
Condense, while liquid filling hole collides to form water attack, cause blade surface to be damaged by erosion；
For cavitation phenomenons, its solution is usually reduction pump height, lifts liquid level to increase the pressure of pump intake
Power, so as to lift available NPSH, to avoid cavitation, but the method is larger to space requirement, and 1-2m difference in height is
It can play a part of preventing cavitation, improve civil engineering cost, have impact on the arrangement of the small-sized skid body of ORC TRTs, and
Often because can not be implemented by construction space conditionality；
In addition, handling flow passage components surface, anti-vapour is carried out using spraying stainless steel and epoxy micaceous iron anticorrosive paint
Erosion repairing, paint film is tough and tensile, wear-resisting after spraying, and case hardness is up to HRC60-70；Although this method improves the use longevity of pump
Life, but pump can not be solved occur cavitation phenomenons this root problem, it is impossible to solve the vibration of pump during cavitation, noise and to being
The influence for stability of uniting.
The content of the invention
Instant invention overcomes above-mentioned the deficiencies in the prior art the liquid storage of ORC electricity generation system pump cavitations is prevented there is provided a kind of
Device and its application method；The present invention is controlled by adjusting cooling water flow change heat transfer effect to organic working medium temperature,
To realize the control to available NPSH, cooling water makes the reduction of organic working medium temperature, to ensure available NPSH NPSHaRise
Height, solves the problem of cavitation of pump, and avoids the restricted problem in transformation space.
Technical scheme：
It is a kind of to prevent the device for storing liquid of ORC electricity generation system pump cavitations, including condenser, working medium fluid reservoir, cooling water circulation
Pump, working medium pump；The condenser is divided into working medium side runner and cooling water flow conduits, according to Working fluid flow direction, the working medium effluent
Road is connected by pipeline with systematic working medium side entrance and working medium fluid reservoir respectively, and the working medium fluid reservoir passes through pipeline and working medium pump
It is sequentially connected with systematic working medium side outlet, the working medium fluid reservoir is internally provided with working medium tank cooling line, according to cooling current
Dynamic direction, the entrance point of the working medium tank cooling line by pipeline successively with cooling water circulating pump and system cooling water side entrance
Connection, the port of export of working medium tank cooling line is connected by pipeline with cooling water flow conduits, and the cooling water flow conduits also pass through pipeline
It is connected with system cooling water side outlet.
Further, pressure sensing cell and temperature are provided with the pipeline between the working medium fluid reservoir and the working medium pump
Spend detection unit.
Further, it is provided with flow detection list on the pipeline between the working medium pump and the systematic working medium side outlet
Member.
Further, the pressure sensing cell is one group of pressure sensor.
Further, the temperature detecting unit is one group of temperature sensor.
Further, the flow detection unit is one group of volume flowmeter.
A kind of application method for the device for storing liquid for preventing ORC electricity generation system pump cavitations, comprises the following steps：
A, working medium cooling：Organic working medium from ORC electricity generation system other parts is entered from systematic working medium side entrance through pipeline
Enter condenser, exchanged heat with cooling water, the organic working medium for being cooled to liquid enters working medium fluid reservoir；
B, working medium temperature adjustment：Liquid refrigerant enter working medium fluid reservoir after, in working medium fluid reservoir with working medium tank cooling line
Cooling water exchanged heat, obtain with temperature TvOrganic working medium into working medium pump boost, finally from systematic working medium side outlet
Into the other parts of ORC electricity generation systems；
C, cooling water flow regulation：By Temperature of Working TvCorresponding saturation pressure requires pressure P with controlvComparison knot
Fruit works as T as cooling water flow control signalvCorrespondence saturation pressure is less than Pv, then cooling water flow keep it is constant, pump it is effective
Net positive suction head, which is met, to be required, works as TvCorrespondence saturation pressure is more than or equal to PvWhen, by adjusting cooling water circulating pump, increase working medium
The heat exchange amount of cooling water flow in tank cooling line, regulation cooling water and organic working medium, so as to reduce organic working medium temperature Tv
And its saturation pressure so that the available NPSH of pump, which is met, to be required.
The present invention has the advantages that relative to prior art：
The present invention is controlled by adjusting cooling water flow change heat transfer effect to organic working medium temperature, to realize to having
The control of net positive suction head is imitated, cooling water makes the reduction of organic working medium temperature, to ensure available NPSH NPSHaRise, solves pump
Problem of cavitation, and avoid transformation space restricted problem；
The present invention is calculated by setting temperature detecting unit, pressure sensing cell, flow detection unit by measurement signal
Cooling water flow control signal is produced, cooling water flow is adjusted in real time；
The present invention can directly replace original working medium fluid reservoir, install working medium additional under the conditions of ORC electricity generation system existing equipments
Tank cooling line, can not only be configured to the pump of new-built unit, can also carry out add-assembly to the system built up；
The additional aspect and advantage of the present invention will be set forth in part in the description, and will partly become from the following description
Obtain substantially, or recognized by the practice of invention.
Brief description of the drawings
Fig. 1 is the structural representation of the present invention；
In figure：1- systematic working mediums side entrance；2- working medium fluid reservoirs；3- condensers；4- systems cooling water side is exported；5- systems
Cooling water side entrance；6- cooling water circulating pumps；7- working medium tank cooling lines；8- temperature detecting units；9- pressure sensing cells；
10- working medium pumps；11- flow detection units；12- systematic working medium side outlets.
Embodiment
Below with reference to accompanying drawing, the present invention is described in detail.
Embodiment one：
It is a kind of disclosed in the present embodiment to prevent the device for storing liquid of ORC electricity generation system pump cavitations including cold with reference to shown in Fig. 1
Condenser 3, working medium fluid reservoir 2, cooling water circulating pump 6, working medium pump 10；The condenser 3 includes working medium side runner and cooling current
Road pipeline, according to Working fluid flow direction, the working medium side runner passes through pipeline and systematic working medium side entrance 1 and working medium liquid storage respectively
Tank 2 is connected, and the working medium fluid reservoir 2 is sequentially connected by pipeline with working medium pump 10 and systematic working medium side outlet 12, the working medium
Fluid reservoir 2 is internally provided with working medium tank cooling line 7, according to flow of cooling water direction, the import of the working medium tank cooling line 7
End is connected with cooling water circulating pump 6 and system cooling water side entrance 5 successively by pipeline, the port of export of working medium tank cooling line 7
It is connected by pipeline with cooling water flow conduits, the cooling water flow conduits are also connected by pipeline with system cooling water side outlet 4,
The cooling water circulating pump 6 is also connected by pipeline with the system cooling water side entrance 5, and the cooling water flow conduits also pass through pipe
Road is connected with system cooling water side outlet 4；
Specifically, be provided with pipeline between the working medium fluid reservoir 2 and the working medium pump 10 temperature detecting unit 8 and
Flow detection list is provided with pressure sensing cell 9, the pipeline between the working medium pump 10 and the systematic working medium side outlet 12
Member 11；
Specifically, the temperature detecting unit, pressure sensing cell, flow detection unit will obtain measurement signal, pass through
Cooling water flow control signal is obtained after calculating processing to be controlled cooling water circulating pump.
Specifically, the temperature detecting unit 8 is one group of temperature sensor；The pressure sensing cell 9 is one group of pressure
Sensor；The flow detection unit 11 is one group of volume flowmeter；Temperature detecting unit 8 uses range at -50 DEG C -200 DEG C,
The temperature sensor of precision 1%, pressure sensing cell 9 is using range in 0.1MPa-3MPa, and precision is 1% pressure sensor,
Flow detection unit 11 is using range in 0.5-1.5m3/ min, precision is 1% volume flowmeter.
A kind of application method for the device for storing liquid for preventing ORC electricity generation system pump cavitations, comprises the following steps：
A, working medium cooling：Organic working medium from ORC electricity generation system other parts is entered from systematic working medium side entrance 1 through pipeline
Enter condenser 3, exchanged heat with cooling water, the organic working medium for being cooled to liquid enters working medium fluid reservoir 2；
B, working medium temperature adjustment：Liquid refrigerant enters after working medium fluid reservoir 2, with working medium tank cooling line 7 in working medium fluid reservoir 2
In cooling water exchanged heat, obtain with temperature TvOrganic working medium boosted into working medium pump 10, finally from systematic working medium side
Outlet 12 enters the other parts of ORC electricity generation systems；
C, cooling water flow regulation：By Temperature of Working TvCorrespondence saturation pressure requires pressure P with controlvComparative result
As cooling water flow control signal, work as TvCorrespondence saturation pressure is less than Pv, then cooling water flow keep constant, effective vapour of pump
Lose surplus and meet requirement, work as TvCorrespondence saturation pressure is more than or equal to PvWhen, by adjusting cooling water circulating pump 6, increase working medium tank
The heat exchange amount of cooling water flow in cooling line 7, regulation cooling water and organic working medium, so as to reduce organic working medium temperature TvAnd
Its saturation pressure so that the available NPSH of pump, which is met, to be required.
Temperature T is measured according to the temperature detecting unit 8v, pressure P is measured according to the pressure sensing cell 9s。
The available NPSH calculation formula of pump：
In formula：PsFor pump intake static pressure, Pa；
VsFor velocity of medium at pump intake, m/s；
PvIt is medium in its temperature TvLower correspondence saturation pressure, Pa；
ρ is temperature TvWorker quality liquid density under correspondence, kg/m3；
The necessary NPSH calculation formula of pump：
In formula：V0For the absolute velocity before vane inlet, m/s；
W0For the relative velocity m/s of pressure lowest part before vane inlet；
λ is vane inlet pressure-drop coefficient；
Necessary NPSH is that test measurement is passed through by pump producer, calculates and obtains with reference to formula, is that pump producer makes to user
Required with condition.As available NPSH NPSHaMore than necessary net positive suction head NPSHrWhen, it is ensured that do not occur cavitation.Typically
It is required that available NPSH be more than must 0.5~1m of net positive suction head be left surplus to ensure pump stable operation.It is required that such as following formula：
NPSHa≥NPSHr+1
Control requires pressure PvAccording to formula：
Refrigerant flow rate V at pump intakesFor according to formula：
In formula：Q is the conduit volume flow m measured using flow detection unit 113/ s,
D is pipe diameter, m.
Embodiment two：
In the present embodiment：The temperature detecting unit 8 is arranged in have on pipeline and inserted in deep hot-well, it is ensured that You Jigong
The seal of matter pipeline is measured to Temperature of Working simultaneously.
Embodiment three：
In the present embodiment：The pressure sensing cell 9 is arranged on the angle valve that branch holder is connected on pipeline, passes through angle valve
Switch, connection or shielding system and pressure sensing cell, it is ensured that the seal of organic working medium pipeline enters to power pressure simultaneously
Row measurement.
Example IV：
In the present embodiment：The condenser 3 uses vertical plate type heat exchanger, and heat exchanger, which crosses cold-zone, has certain liquid level high
Degree, certain pressure head is provided for the available NPSH of pump.
Embodiment five：
In the present embodiment：The working medium tank cooling line 7 helically rises cloth in parallel from the bottom to top using metal tubes
It is placed in inside working medium fluid reservoir.
Embodiment six：
In the present embodiment：The flow detection unit 11 is vortex-shedding meter.
Embodiment seven：
In the present embodiment：The cooling water circulating pump 6 is that can receive the variable frequency pump of cooling water flow control signal.
Above example is the exemplary illustration to this patent, does not limit its protection domain, people in the art
Member can also be changed to its part, as long as no the Spirit Essence beyond this patent, all in the protection domain of this patent.
Claims (7)
1. a kind of prevent the device for storing liquid of ORC electricity generation system pump cavitations, it is characterised in that including condenser (3), working medium fluid reservoir
(2), cooling water circulating pump (6), working medium pump (10)；The condenser (3) includes working medium side runner and cooling water flow conduits, according to work
Matter flow direction, the working medium side runner is connected by pipeline with systematic working medium side entrance (1) and working medium fluid reservoir (2) respectively,
The working medium fluid reservoir (2) is sequentially connected by pipeline with working medium pump (10) and systematic working medium side outlet (12), the working medium storage
Flow container (2) is internally provided with working medium tank cooling line (7), according to flow of cooling water direction, the working medium tank cooling line (7)
Entrance point is connected with cooling water circulating pump (6) and system cooling water side entrance (5) successively by pipeline, working medium tank cooling line
(7) the port of export is connected by pipeline with cooling water flow conduits, and the cooling water flow conduits also pass through pipeline and the system cooling water
Side outlet (4) is connected.
2. a kind of the device for storing liquid of ORC electricity generation system pump cavitations is prevented according to claim 1, it is characterised in that described
Temperature detecting unit (8) and pressure sensing cell are provided with pipeline between working medium fluid reservoir (2) and the working medium pump (10)
(9)。
3. a kind of the device for storing liquid of ORC electricity generation system pump cavitations is prevented according to claim 1 or 2, it is characterised in that institute
State and flow detection unit (11) is provided with the pipeline between working medium pump (10) and the systematic working medium side outlet (12).
4. a kind of the device for storing liquid of ORC electricity generation system pump cavitations is prevented according to claim 2, it is characterised in that described
Temperature detecting unit (8) is one group of temperature sensor.
5. a kind of the device for storing liquid of ORC electricity generation system pump cavitations is prevented according to claim 2, it is characterised in that described
Pressure sensing cell (9) is one group of pressure sensor.
6. a kind of the device for storing liquid of ORC electricity generation system pump cavitations is prevented according to claim 3, it is characterised in that described
Flow detection unit (11) is one group of volume flowmeter.
7. a kind of a kind of any described uses for the device for storing liquid for preventing ORC electricity generation system pump cavitations of utilization claim 1-6
Method, it is characterised in that comprise the following steps：
A, working medium cooling：Organic working medium from ORC electricity generation system other parts enters from systematic working medium side entrance (1) through pipeline
Condenser (3), is exchanged heat with cooling water, and the organic working medium for being cooled to liquid enters working medium fluid reservoir (2)；
B, working medium temperature adjustment：Liquid refrigerant enters after working medium fluid reservoir (2), with working medium tank cooling line in working medium fluid reservoir (2)
(7) cooling water in is exchanged heat, and is obtained with temperature TvOrganic working medium into working medium pump (10) boost, finally from system work
Matter side outlet (12) enters ORC electricity generation systems；
C, cooling water flow regulation：By Temperature of Working TvCorrespondence saturation pressure requires pressure P with controlvComparative result conduct
Cooling water flow control signal, works as TvCorrespondence saturation pressure is less than Pv, then cooling water flow holding is constant, more than effective cavitation of pump
Amount, which is met, to be required, works as TvCorrespondence saturation pressure is more than or equal to PvWhen, by adjusting cooling water circulating pump (6), increase working medium tank is cold
But the cooling water flow in pipeline (7), adjusts the heat exchange amount of cooling water and organic working medium, so as to reduce organic working medium temperature TvAnd
Its saturation pressure so that the available NPSH of pump, which is met, to be required.
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| CN201710481101.9A CN107035727A (en) | 2017-06-22 | 2017-06-22 | It is a kind of to prevent the device for storing liquid and its application method of ORC electricity generation system pump cavitations |
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| CN201710481101.9A CN107035727A (en) | 2017-06-22 | 2017-06-22 | It is a kind of to prevent the device for storing liquid and its application method of ORC electricity generation system pump cavitations |
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Cited By (3)
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| CN108897348A (en) * | 2018-09-25 | 2018-11-27 | 中国船舶重工集团公司第七0三研究所 | A kind of ORC electricity generation system working medium tank automatic Control Systems of Liquids Height |
| CN112443758A (en) * | 2020-12-16 | 2021-03-05 | 中国海洋石油集团有限公司 | LPG pump series control system and control method thereof |
| CN113944649A (en) * | 2021-09-24 | 2022-01-18 | 珠海格力电器股份有限公司 | Pump cavitation risk judgment method and device, electronic equipment and storage medium |
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