CN103161774B - A kind of temp liquid piston device making gas isothermal convergent-divergent - Google Patents
A kind of temp liquid piston device making gas isothermal convergent-divergent Download PDFInfo
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Abstract
The invention belongs to liquid piston technical field, be specifically related to a kind of temp liquid piston device making gas isothermal convergent-divergent.The top in two liquid piston chambeies is connected with high-pressure gas pipelines, low-pressure gas pipeline respectively; The bottom in two liquid piston chambeies is all passed through respective fluid pipeline and is connected with outside hydraulic set; Arrange in multiple chamber in liquid piston chamber and store liquid unit, during work, liquid can be wherein resident, utilize store liquid unit increase liquid and gas Contact area improves both rate of heat exchange, utilize fluid temperature control gas temperature to change with the object realizing gas isothermal convergent-divergent.Store liquid unit in chamber and have the multiple enhancement mode temperature control method such as two kinds of basic structures and with spraying, liquid circulated, air-filtering type, can be realized by one or more combination mode.
Description
Technical field
The invention belongs to liquid piston technical field and compressed-air energy storage field, particularly relate to a kind of concurrent heating temperature control technique utilizing liquid piston, be specifically related to a kind of temp liquid piston device making gas isothermal convergent-divergent.
Background technique
Energy storage technology has been regarded as the important component part in operation of power networks process, and wherein compressed-air energy storage application is comparatively extensive.But compressed-air energy storage has some limitations, the major defect of compressed-air energy storage usually coordinates with gas turbine, need to consume combustion gas, produce environmental pollution, easily reveal, energy density is low, and air compressing, expansion time, temperature variation is violent, comparatively large to the injury of equipment, causes the cost of overhaul high.
In recent years, liquid piston is applied in compressed-air energy storage by existing research, solve the environmental pollution problem that compressed-air energy storage brings, but air compressing/inflation process mostly is adiabatic or free expansion process, temperature variation is violent, produce heat not easily to preserve, pressurized air potential energy can not utilize completely, and energy storage utilization ratio is low.
In domestic and international existing liquid piston, each piston cavity is made up of single high-pressure bottle, without storing the design of liquid cell mesh, more without temperature conditioning unit in chamber.Its drawback is that gas convergent-divergent process mostly is adiabatic, free expansion process, makes the pressurized air efficiency that releases energy low.
Summary of the invention
The present invention is directed in the compression process of compressed-air energy storage low temperature when there is heat loss and expand and cause the problem that pressure decline energy loss is large, propose a kind of temp liquid piston device making gas isothermal convergent-divergent.
The technical solution used in the present invention is:
The top in two liquid piston chambeies is connected with high-pressure gas pipelines and low-pressure gas pipeline respectively; The bottom in two liquid piston chambeies is connected with outside hydraulic set; Arrange in multiple chamber in liquid piston chamber and store liquid unit.
Described outside hydraulic set is the equipment driven by liquid potential energy difference comprising hydraulic piston mechanism, oil hydraulic motor, utilizes the conversion that outside hydraulic set realizes between liquid potential energy and other form energies.
Store liquid unit in described chamber to construct with Heat Conduction Material, for storage of liquids, increase the area of contact with gas, promote the heat exchange of liquids and gases, based on the feature that specific heat of liquid is large, utilize stable fluid temperature to control gas temperature, limit temperature change within the specific limits.
Store liquid unit in described chamber and have two kinds of basic structures, be respectively sink structure that top open bottom closes and upper body and close bottom and be connected to water pack arrangement bottom piston cavity below liquid level by pipeline; Adopt with spraying on this basis, liquid circulated, air-filtering type three kinds of temperature control methods strengthen temperature control effect further
The first basic structure of liquid unit is stored in described chamber, namely the sink structure form that top open bottom is closed is: store liquid unit in several chambeies by being longitudinally placed in liquid piston chamber, store in chamber between liquid unit and liquid piston cavity wall and there is space, liquids and gases can pass through from space, utilize gaseous exchange mode to realize temperature and control.
Liquid unit the second basic structure is stored in described chamber, water pack arrangement form is: the upper body storing liquid unit in chamber is placed in liquid piston chamber with the water tank closed or tube shaped, storing liquid unit bottom in chamber to be connected to bottom liquid piston chamber below liquid level by pipeline, when liquid level is lower than when storing liquid unit in chamber, due to upper end closed, liquid in upper body structure can be retained, and realizes controlling the temperature of gas by gaseous exchange mode.
For improving convection effects further, no matter being sink structure and water pack arrangement form, the area that the supporting facility such as radiating fin increase thermal conduction portions can being increased, improve the ability of heat exchange between liquids and gases.。
Described with spraying temperature control method is: store the one that liquid unit adopts two kinds of basic structures in chamber, the bottom of the bottom of its sink structure or the upper body of water pack arrangement arranges water hole, when liquid level is lower than after storing liquid unit bottom in chamber, liquid can flow out the effect forming spray downwards from water hole, strengthens the heat exchange of liquids and gases.
Described air-filtering type temperature control method is: storing liquid unit in chamber is sink structure, liquid unit is stored by being longitudinally placed in liquid piston chamber in several chambeies, store in chamber between liquid unit and liquid piston cavity wall and there is space, in the top center position of sink structure, baffle plate is set, block in chamber the air flue stored above liquid unit, structure local micro liquid piston, making gas in the form of bubbles by storing liquid unit, strengthening the heat exchange between gas and liquid.
Described liquid circulated temperature control method is: when liquid level is lower than after storing liquid unit main body in chamber, stores the one or both ends access water pump of liquid unit lower pipeline, drive in the liquid bottom liquid piston chamber and chamber the liquid-circulating stored in liquid unit in the chamber of water pack arrangement; Or adopt extra pipeline and water pump, the liquid bottom liquid piston chamber is sent into sink structure and stores in liquid unit, form liquid-circulating and strengthen liquids and gases heat exchange.
The airtight place of upper body of the bottom or the second basic structure that store the first basic structure of liquid unit in described chamber is provided with valve, store liquid unit during valve closing in chamber to have and store liquid ability, store the water mixing inside and outside liquid unit during valve open in chamber, inside and outside making to store liquid unit in chamber, fluid temperature is consistent.
The make and the temperature control method that store liquid unit in described chamber can combination in any use.
Described liquid piston chamber adopts internal liquid suction heat release to carry out temperature control to gas, and when working long hours, fluid temperature can exceed the scope of permission.Liquid piston chamber bottom liquid port now can be utilized to discharge liquid, and the liquid again obtaining suitable temperature from other suitable liquid sources pumps into piston cavity.
Useful benefit of the present invention comprises the following aspects:
(1) the present invention improves conventional compression air energy storage technology, is that medium compresses air and discharges with liquid, and leak when decreasing gas convergent-divergent and friction that mechanical slip brings, thoroughly, efficiency is high for fault offset; Both the advantage of integrated liquid piston, took into account function of temperature control again, improve the utilization ratio of energy in pressurized air, had good energy-saving effect; Solving gas volume change institute brings dramatic temperature to change potential hazard to equipment, and guarantee working gas temperature in energy storage/exoergic process is basicly stable.
(2) the present invention arranges and stores liquid unit in liquid piston chamber, solve in compressed-air energy storage process the problem that temperature variation affects efficiency, store liquid unit in chamber and realize gas isothermal compression, inflation process by special construction design, improve compressed air efficiency.
(3) potential energy in pressurized air is that medium is changed with liquid by the present invention, by external energy conversion unit, is mechanical energy or other form of energy by liquid potential energy converting and energy, for generating or machine-building etc. provide motive force.Package unit improves the energy utilization efficiency of compressed-air energy storage, and remains that liquid piston is applied to of low pollution that compressed-air energy storage has, leaks less, the advantage of few friction, forms green high-efficient compressed-air energy-storage system.
(4) the present invention adopts liquid piston, can be designed by pressure transition duct, realizes high and low pressure water end (W.E.) mouth, facilitates external energy conversion unit to connect, and the liquid realized between two chambeies exchanges.
(5) the present invention can realize installing on the spot, reduces compressed-air energy storage hardware requirement, does not need specific geographic condition, reduces and builds installation difficulty, reduces and builds installation cost.
Accompanying drawing explanation
Fig. 1 is a kind of implementation of the temp liquid piston device that can make gas isothermal convergent-divergent;
Fig. 2 stores the schematic diagram that liquid unit adopts sink structure in chamber;
Fig. 3 stores liquid unit to adopt sink structure in chamber, in conjunction with the structural representation of air-filtering type temperature control method, wherein Fig. 3 (a) and Fig. 3 (b) are respectively and set up baffle plate and baffle plate, tank in conjunction with two kinds of forms;
Fig. 4 stores liquid unit to adopt sink structure, the structural representation of with spraying, liquid circulated two kinds of temperature control methods in chamber;
Fig. 5 stores liquid unit to adopt water pack arrangement, the structural representation of liquid circulated temperature control method in chamber, wherein Fig. 5 (a) and Fig. 5 (b) is respectively the different expression form of main body closed conduct formula;
Fig. 6 is Fig. 4, Fig. 5 structure of a kind of temp liquid piston device provided by the invention and the structural representation of temperature control method composite entity exemplary plot;
Fig. 7 (a) is Fig. 2, Fig. 4 structure and the temperature control method composite entity exemplary plot of a kind of temp liquid piston device provided by the invention, and wherein Fig. 7 (b) is for storing the details enlarged view of liquid unit.
Fig. 8 is the overall construction drawing storing the valvular temp liquid piston device of liquid unit bottom band in chamber;
The overall construction drawing that Fig. 9 is outside hydraulic set when being hydraulic pump;
The overall construction drawing that Figure 10 is outside hydraulic set when being hydraulic piston;
Number in the figure:
1-pressurized gas port, 2-low-pressure gas port, 3-first liquid port, 4-second liquid port, 5-first liquid piston cavity, 6-second liquid piston cavity, liquid unit is stored in 7-chamber, 8-high-pressure gas pipelines, 9-low-pressure gas pipeline, 10-first liquid pipeline, 11-second liquid pipeline, the outside hydraulic set of 12-, 13-18-valve, 19-stores liquid cell shutter, 20-water pump, 21-liquid circulation lines, 22-water seepage hole, stores the valve of liquid unit bottom in 23-chamber, 24-27-valve, 28-hydraulic pump, 29-32-valve, 33-hydraulic piston.
Embodiment
The invention provides a kind of temp liquid piston device making gas isothermal convergent-divergent, below in conjunction with accompanying drawing, the present invention will be further described.
Fig. 1 is a kind of implementation of the temp liquid piston device that can make gas isothermal convergent-divergent.This device by two liquid piston chambeies 5,6, store in some chambeies liquid unit 7, high-pressure gas pipelines 8, low-pressure gas pipeline 9, fluid pipeline 10,11, some valve 13-18 form; Wherein the top of first liquid piston cavity 5 is connected with high-pressure gas pipelines 8 and low-pressure gas pipeline 9 with 14 respectively by valve 13, and the top of second liquid piston cavity 6 is connected with high pressure gas pipeline road 8, Low-pressure Gas Pipeline 9 with 16 respectively by valve 15; Arrange in multiple chamber in liquid piston chamber 5 and 6 and store liquid unit 7, exchange the object to realize gas isothermal convergent-divergent by the Rapid Thermal of liquid and gas; The bottom in liquid piston chamber 5 and 6 arranges liquid external-connected port 3 and 4 respectively, and is connected with outside hydraulic set 12 by pipeline.The potential energy converting and energy of highly pressurised liquid is other forms of energy by outside hydraulic set 12, for generator or other equipment provide motive force, and bearing the effect of fluid exchange within two chambeies, can be the equipment that hydraulic piston or oil hydraulic motor etc. are driven by liquid potential energy difference.
Store liquid unit 7 in chamber with Heat Conduction Material structure, as metal etc., for storage of liquids, the feature utilizing specific heat of liquid large realizes the control to gas temperature.
Store liquid unit 7 in chamber and have sink structure and water pack arrangement two kinds of basic structures, the multiple temperature control methods such as with spraying, liquid circulated, air-filtering type can be adopted to strengthen temperature control effect further.
Fig. 2 stores the schematic diagram that liquid unit adopts sink structure in chamber.Store liquid unit 7 in chamber for sink structure, storing liquid unit 7 in several chambeies is placed in liquid piston chamber 5 and 6, stores between liquid unit and liquid piston cavity wall to there is space in chamber, is the passage of gas flow.Tank can be fixed on liquid piston cavity wall as shown in the figure, also tank can be stacked gradually and be fixed on bottom liquid piston chamber or other places, even can not fix, be arranged in liquid piston chamber in arbitrary arrangement mode.
Fig. 3 stores liquid unit to adopt sink structure, the structural representation of air-filtering type temperature control method in chamber.Liquid unit 7 is stored for sink structure in chamber, storing liquid unit 7 in several chambeies is placed in liquid piston chamber 5 and 6, store in chamber between liquid unit and liquid piston cavity wall and there is space, above sink structure and middle position baffle plate 19 is set, make the air flue that stores in chamber above liquid unit airtight, structure minisize liquid piston, make gas in the form of bubbles by storing liquid unit, ensure that gas-liquid fully mixes, heat exchanging process carries out fully, maintains intracavity gas temperature stabilization.Wherein Fig. 3 (a) and Fig. 3 (b) are respectively and set up baffle plate and baffle plate tank in conjunction with two kinds of forms.
Fig. 4 stores liquid unit to adopt sink structure, the structural representation of with spraying, external liquid circulation formula two kinds of temperature control methods in chamber.The top that liquid unit 7 is placed in liquid piston chamber 5 and 6 is stored in chamber, liquid unit 7 is stored in the liquid of liquid piston chamber inner bottom part sends into top chamber by water pump 20, liquid circulation lines 21, store in chamber bottom liquid unit 7 and water seepage hole 22 is set, form the effect of spray downwards.
Fig. 5 stores liquid unit to adopt water pack arrangement, the structural representation of liquid circulated temperature control method in chamber, wherein Fig. 5 (a) and Fig. 5 (b) are respectively parallel and helical pipe two kinds of forms.Store liquid unit 7 in chamber to construct with parallel, spiral steel pipe, be placed in the top of liquid part in liquid piston chamber 5 and 6, the two ends of pipeline configuration arrange water pump 20, are placed in the bottom in liquid piston chamber, drive in liquid piston chamber and chamber the liquid-circulating stored in liquid unit, keep gas temperature to stablize.
In addition, the above-mentioned two kinds of basic structures storing liquid unit may be combined with, and three kinds of temperature control methods also can independent assortment, forms the design of plurality of liquid piston cavity, the example that Fig. 4 is with spraying, external liquid circulation formula two kinds of temperature control methods combine.
Fig. 6 is Fig. 4, Fig. 5 structure and the temperature control method composite entity exemplary plot of a kind of temp liquid piston device provided by the invention;
Fig. 7 (a) is Fig. 2, Fig. 4 sink structure and the with spraying temperature control method composite entity exemplary plot of a kind of temp liquid piston device provided by the invention, and Fig. 7 (b) is for storing liquid unit details enlarged view.
Fig. 8 is the overall construction drawing storing the valvular temp liquid piston device of liquid unit bottom band in chamber.When the valve is closed, store liquid unit in chamber to have and store liquid ability; When the valve is open, the water stored inside and outside liquid unit can mix, and inside and outside making to store liquid unit, liquid fully mixes, and keeps temperature consistent.
Fig. 9 and the two kinds of specific implementations that Figure 10 shows that outside hydraulic set.Fig. 9 is hydraulic pump, and Figure 10 is hydraulic piston.They are all the equipment driven by liquid potential energy difference, can be the other forms of energy such as electric energy, mechanical energy by the potential energy converting and energy of highly pressurised liquid, for generator or other equipment provide motive force, and bear the effect of fluid exchange between two liquid piston chambeies.
During liquid piston work, gas expansion for doing work process is: when supposing initial, full liquid is stored in liquid piston chamber 5, a small amount of liquid is had in liquid piston chamber 6, valve 13, 16 open, valve 14, 15 close, appropriate pressurized gas enter liquid piston chamber 5 by high pressure gas pipeline road 8, then throttle down 13, pressurized gas are expansion work in liquid piston chamber 5, liquid piston chamber 5 inner horizontal is declined, liquid flows out from first liquid external-connected port 3, because liquid piston chamber 6 is connected with low-pressure gas pipeline, liquid external-connected port 3, potential energy difference is formed between 4, for outside hydraulic set 12 provides motive force, be linear mechanical motion by the potential energy converting and energy of water, liquid is sent in liquid piston chamber 6 simultaneously, liquid piston chamber 5 inner horizontal declines.Meanwhile, store storage area liquid in liquid unit 7 in chamber, carry out heat exchange with air, realize the stable of temperature in gas expansion process.At the end of power phase process, in liquid piston chamber 5, liquid only has a small amount of liquid (store in chamber in liquid unit and still store full liquid) of bottom, full liquid is stored in liquid piston chamber 6, now valve 14,15 is opened, valve 13,16 is closed, appropriate pressurized gas enter liquid piston chamber 6 by high pressure gas pipeline road 8, and then valve 15 is closed.The inflation process of gas afterwards in liquid piston chamber 6 is identical with gas expansion process in aforesaid liquid piston cavity 5.So repeatedly the energy in pressurized air can be discharged completely.
Gas compression processes is: when supposing initial, does not almost have liquid (only have in chamber to store in liquid unit 5 and store full liquid), store full liquid in liquid piston chamber 6 in liquid piston chamber 5.Throttle down 13,14,15, opens valve 16.Outside hydraulic set 12 does work and is evacuated in liquid piston chamber 5 by the liquid in liquid piston chamber 6, liquid level in liquid piston chamber 5 rises gradually, air pressure raises gradually, when the air pressure in liquid piston chamber 5 is greater than the air pressure in high-pressure gas pipelines 8, open valve 13, pressurized gas are transported in high-pressure gas pipelines 8.Now be full of liquid in liquid piston chamber 5, except storing liquid unit in chamber, a small amount of liquid in bottom is only had in liquid piston chamber 6, throttle down 13 and 16 afterwards, open valve 14, liquid in liquid piston chamber 5 is extracted in liquid piston chamber 6 by outside hydraulic set 12, then be transported to compressing the pressurized gas obtained in high-pressure gas pipelines 8, process is identical with said process.So repeatedly electric energy can be converted to continuously compressed-air actuated potential energy to store.
Claims (8)
1. can make a temp liquid piston device for gas isothermal convergent-divergent, it is characterized in that: two liquid piston chambeies (5) are connected with high-pressure gas pipelines (1) and low-pressure gas pipeline (2) respectively with the top of (6); The bottom in two liquid piston chambeies is connected with outside hydraulic set (12); Arrange in liquid piston chamber in multiple chamber and store liquid unit (7);
Described outside hydraulic set is the equipment driven by liquid potential energy difference comprising hydraulic piston mechanism, oil hydraulic motor, utilizes the conversion that outside hydraulic set realizes between liquid potential energy and other form energies;
Store liquid unit in described chamber to construct with Heat Conduction Material, for storage of liquids, increase the area of contact with gas, promote the heat exchange of liquids and gases, based on the feature that specific heat of liquid is large, utilize stable fluid temperature to control gas temperature, limit temperature change within the specific limits;
Store liquid unit in described chamber and have two kinds of basic structures, be respectively sink structure that top open bottom closes and upper body and close bottom and be connected to water pack arrangement bottom piston cavity below liquid level by pipeline; Adopt with spraying on this basis, liquid circulated, air-filtering type three kinds of temperature control methods strengthen temperature control effect further.
2. the temp liquid piston device making gas isothermal convergent-divergent according to claim 1, it is characterized in that: in described chamber, store the first basic structure of liquid unit, sink structure form is: the top open bottom storing liquid unit is closed, storing liquid unit in several chambeies is placed in liquid piston chamber, store in chamber between liquid unit and liquid piston cavity wall and there is space, liquids and gases can pass through from space, utilize gaseous exchange mode to realize temperature and control.
3. the temp liquid piston device making gas isothermal convergent-divergent according to claim 1, it is characterized in that: in described chamber, store liquid unit the second basic structure, water pack arrangement form is: the upper body storing liquid unit in chamber is placed in liquid piston chamber with the water tank closed or tube shaped, storing liquid unit bottom in chamber to be connected to bottom liquid piston chamber below liquid level by pipeline, when liquid level is lower than when storing liquid unit in chamber, due to upper end closed, liquid in upper body structure can be retained, and realizes controlling the temperature of gas by gaseous exchange mode.
4. the temp liquid piston device making gas isothermal convergent-divergent according to claim 1, it is characterized in that: described with spraying temperature control method is: in chamber, store the one that liquid unit adopts two kinds of basic structures, the bottom of the bottom of its sink structure or the upper body of water pack arrangement arranges water hole, when liquid level is lower than after storing liquid unit bottom in chamber, liquid can flow out the effect forming spray downwards from water hole, strengthens the heat exchange of liquids and gases.
5. the temp liquid piston device making gas isothermal convergent-divergent according to claim 1, it is characterized in that: described air-filtering type temperature control method is: storing liquid unit in chamber is sink structure, liquid unit is stored by being longitudinally placed in liquid piston chamber in several chambeies, store in chamber between liquid unit and liquid piston cavity wall and there is space, in the top center position of sink structure, baffle plate is set, block in chamber the air flue stored above liquid unit, structure local micro liquid piston, making gas in the form of bubbles by storing liquid unit, strengthening the heat exchange between gas and liquid.
6. the temp liquid piston device making gas isothermal convergent-divergent according to claim 1, it is characterized in that: described liquid circulated temperature control method is: when liquid level is lower than after storing liquid unit main body in chamber, store the one or both ends access water pump of liquid unit lower pipeline in the chamber of water pack arrangement, drive in the liquid bottom liquid piston chamber and chamber the liquid-circulating stored in liquid unit; Or adopt extra pipeline and water pump, the liquid bottom liquid piston chamber is sent into sink structure and stores in liquid unit, form liquid-circulating and strengthen liquids and gases heat exchange.
7. the temp liquid piston device making gas isothermal convergent-divergent according to claim 1, it is characterized in that: the upper body of the bottom or the second basic structure that store the first basic structure of liquid unit in described chamber is provided with valve, store liquid unit during valve closing in chamber to have and store liquid ability, store the water mixing inside and outside liquid unit during valve open in chamber, inside and outside making to store liquid unit in chamber, fluid temperature is consistent.
8. the temp liquid piston device of the made gas isothermal convergent-divergent according to Claims 2 or 3 or 4 or 5 or 6 or 7, is characterized in that: the make and the temperature control method that store liquid unit in described chamber can combination in any use.
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| CN104653423B (en) * | 2015-01-27 | 2017-01-11 | 华北电力大学 | Air compression energy storage and thermal power plant-based joint control system and method |
| CN105201926B (en) * | 2015-09-11 | 2018-01-19 | 华北电力大学 | The temp liquid piston device of gas isothermal scaling is realized based on storage gas unit |
| CN106321343B (en) * | 2016-07-28 | 2018-11-09 | 华北电力大学 | Isotherm compression air energy storage power generation and its method based on fluid temperature control |
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| CN106246230B (en) * | 2016-07-28 | 2020-04-07 | 华北电力大学 | Internal temperature control liquid piston device for isothermal compressed air energy storage |
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| CN106640603B (en) * | 2016-09-28 | 2018-12-11 | 江苏众志达新能源科技有限公司 | A kind of compressed air energy storage power generating system based on liquid piston |
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| CN108443110B (en) * | 2018-01-24 | 2020-02-21 | 华北电力大学 | Piston device for realizing gas isothermal compression expansion |
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