CN110273778A - Heater and stirling cycle system for Stirling engine - Google Patents
Heater and stirling cycle system for Stirling engine Download PDFInfo
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- CN110273778A CN110273778A CN201810205051.6A CN201810205051A CN110273778A CN 110273778 A CN110273778 A CN 110273778A CN 201810205051 A CN201810205051 A CN 201810205051A CN 110273778 A CN110273778 A CN 110273778A
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Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02G—HOT GAS OR COMBUSTION-PRODUCT POSITIVE-DISPLACEMENT ENGINE PLANTS; USE OF WASTE HEAT OF COMBUSTION ENGINES; NOT OTHERWISE PROVIDED FOR
- F02G1/00—Hot gas positive-displacement engine plants
- F02G1/04—Hot gas positive-displacement engine plants of closed-cycle type
- F02G1/043—Hot gas positive-displacement engine plants of closed-cycle type the engine being operated by expansion and contraction of a mass of working gas which is heated and cooled in one of a plurality of constantly communicating expansible chambers, e.g. Stirling cycle type engines
- F02G1/053—Component parts or details
- F02G1/055—Heaters or coolers
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- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Resistance Heating (AREA)
Abstract
The invention discloses a kind of heaters for Stirling engine, including tube body and the chamber formed by tube body, are provided with thermal storage member in the chamber；The expansion chamber of one end connection Stirling engine of the tube body, the other end connect the regenerator of Stirling engine；The thermal storage member contacts with gas working medium and changes its flow behavior, strengthens the heat exchange between gas working medium and the wall surface of the tube body, promotes heat absorption of the gas working medium in the heater；The thermal storage member absorbs and stores the heat of compression entrained by the gas working medium in the expansion chamber due to being generated by compression simultaneously.The present invention can reduce the heat fatigue of heater block for the heater of Stirling engine, control the risk that the wall surface temperature in heater structure reduces heater booster, extend heater service life, improve whole efficiency and output work.
Description
Technical field
The present invention relates to a kind of heaters for Stirling engine, and are related to following using the Stirling of the heater
Loop system.
Background technique
The problem of Stirling engine is a kind of external-combustion engine, the shake for avoiding traditional combustion engine due to external-combustion engine quick-fried acting,
Have the characteristics that high efficiency, low noise, low pollution and low operating cost.External-combustion engine can burn various fuel gas, such as: natural
Gas, biogas, also liquid fuels such as incendivity diesel oil, liquefied petroleum gas.Stirling engine can also be used as refrigeration machine, heat pump or
Pressure generator is widely applied, and with the combination for rising itself and solar energy of new energy also more and more attention has been paid to.
Ideal Stirling cycle by isothermal expansion, etc. receiving heat, isotherm compression, etc. appearances absorb heat Four processes form.Heating
Device is the key position of Stirling engine.And the position of most critical is the heating tube body of heater in heater.Due to heating
Device determines the system dynamic source of maximum temperature and Stirling engine inside entire Stirling engine.
In practical Stirling cycle, on the one hand, the compression of working medium and expansion process will lead to the generation of intraductal working medium temperature
Larger fluctuation, so that the material of heating tube body is easy to produce heat fatigue.On the other hand, the heat of compression that the compression of working medium generates, has
It may to be higher than the wall surface temperature of heater tube body in the intracorporal gas working medium temperature of heater tube, for heater tube body material
The temperature tolerance and service life of material propose challenge.The above problem present in existing heater can not only reduce Stirling hair
The overall efficiency of motivation but will lead to the overtemperature tube burst for heating tube body, be unable to run Stirling engine when serious.
Therefore, the heater in existing Stirling engine, exists because of the heat of compression caused by heat fatigue and gas working medium
The limited problem of service life caused by heating to heating tube body is likely to occur heater tube body explosion etc. under serious conditions
Problem.In addition, if it is considered that the heat of compression that is generated when being compressed of gas working medium to the heat effect of heater tube wall, and according to
The maximum temperature that heater tube body can bear is designed, then Stirling engine input heat is limited, to limit
The promotion of complete machine output work and efficiency is made.
Summary of the invention
For the deficiency that heater service life is short in existing Stirling engine, is easy to happen booster etc., the present invention is mentioned
A kind of new heat accumulating type Stirling heater is gone out, by the way that thermal storage member is arranged in the heater, has strengthened gas working medium and adding
While exchanging heat between the tube body wall surface (being equivalent to external heat source) of hot device, gas working medium is promoted to absorb heat in the heater, absorb
And it stores due to the heat of compression generated by compression entrained by gas working medium, so as to effectively reduce the hot tired of heater block
Labor, effectively control heater wall temperature are to guarantee that heater is run in design temperature.
Heater proposed by the present invention for Stirling engine, including tube body and the chamber formed by tube body, institute
It states and is provided with thermal storage member in chamber；The expansion chamber of one end connection Stirling engine of the tube body, the other end connect this spy
The regenerator of woods engine；By the way that thermal storage member, the thermal storage member and gas are arranged in the gas working medium flow path of heater
Working medium contacts and changes its flow behavior, strengthens the heat exchange between gas working medium and the wall surface of the tube body, promotes gas working medium
Heat absorption in the heater；The thermal storage member is absorbed and is stored entrained by the gas working medium in the expansion chamber simultaneously
Due to the heat of compression generated by compression.By introducing thermal storage member in the heater, the present invention is in heater body working medium gas
More turbulent flows are generated in body, reinforce the heat transfer effect between the Working medium gas and external heat source in heater.
In heater for Stirling engine of the invention, the thermal storage member is porous media, at least
Including stacking one of silk screen, metallic fiber, foam metal or sintering metal.By using porous media as thermal storage member,
Heat accumulation and heat release are carried out in the way of metal sensible heat, porous media thermal storage member of the present invention has bigger heat exchange area, makes gas
There is good heat transfer effect between body working medium and thermal storage member.
In heater for Stirling engine of the invention, the thermal storage member is preferably to be made of phase-change material
Phase change element, and for the phase change element to be fixed on the indoor silk screen of the chamber.By using phase change element as accumulation of heat
Component makes have good heat transfer effect between gas working medium and thermal storage member using latent heat heat exchange.
In heater for Stirling engine of the invention, the thermal storage member is wire.By by wire
As thermal storage member, reduces the contact of thermal storage member and heating tube in heater, make to have between gas working medium and thermal storage member
Good heat transfer effect.
In heater for Stirling engine of the invention, the wire is with and not phase parallel with the tube body
The mode of contact is set in the chamber.
In heater for Stirling engine of the invention, the wire twist or on its surface has spiral shell
Line structure, protrusion and/or groove.By being that spiral shape increases between thermal storage member and gas working medium by wire structure setting itself
Heat exchange area, or increase setting helicitic texture, protrusion and/or groove in wire surface, further generate gas working medium disorderly
Stream reinforces the heat exchange between gas working medium and external heat source.
In heater for Stirling engine of the invention, the thermal storage member includes casing and configuration in the set
Heat-storing material in pipe；Described sleeve pipe is mounted in the chamber, is formed between chamber inner wall and sleeve outer wall and is supplied the gas
The flow path of body Working fluid flow.By using casing and in the mode for wherein configuring heat-storing material, make gas working medium and heat storage unit
There is good heat transfer effect between part.
In heater for Stirling engine of the invention, the heat-storing material is preferably porous media, phase transformation material
Material or chemical heat storage material.
In heater for Stirling engine of the invention, the outer wall of described sleeve pipe has protrusion or helicitic texture.
To generate more turbulent flows in heater body gas working medium, reinforce between the gas working medium and external heat source in heater
Heat transfer effect.
The present invention also proposes that a kind of stirling cycle system using above-mentioned heater, the stirling cycle system further include
Expansion chamber and compression chamber are provided with regenerator between the expansion chamber and the compression chamber, described in the setting of expansion chamber side
Cooler is arranged in compression chamber side in heater；The thermal storage member is for absorbing and storing the gas work in the expansion chamber
The heat of compression entrained by matter due to being generated by compression.
Compared with prior art, the invention has the following advantages that
Heater proposed by the present invention with thermal storage member, because the thermal storage member built in heating tube is arranged in gas work
In the flow path of matter, absorbs and store due to the heat of compression generated by compression entrained by the gas working medium in expansion chamber, simultaneously
The heat exchange between gas working medium and the wall surface of tube body can be strengthened, promote heat absorption of the gas working medium in the heater.
Therefore, under conditions of giving same hot-fluid, heater of the invention can be reduced in Working medium gas cyclic process
Temperature fluctuation, reduce influence of the heat fatigue to heater, to extend the service life of heater.
Meanwhile in the identical situation of tube body metal material highest bearing temperature of given heater, heating of the invention
Device can be absorbed and store entrained by the gas working medium in expansion chamber due to being generated by compression because being built-in with thermal storage member
The heat of compression, so enabling tube body to bear bigger hot-fluid, to effectively improve complete machine output work and efficiency.
Detailed description of the invention
Fig. 1 is the structural schematic diagram using the α type Stirling engine of heater of the present invention.
Fig. 2 is schematic diagram of the present invention for the heater of Stirling engine in embodiment 1；
Fig. 3 is schematic diagram of the present invention for the heater of Stirling engine in embodiment 2；
Fig. 4 is schematic diagram of the present invention for the heater of Stirling engine in embodiment 3；
Fig. 5 is schematic diagram of the present invention for the heater of Stirling engine in embodiment 4；
Fig. 6 is the crank angle and gas working medium temperature in embodiment 5 using the α type Stirling engine of heater of the present invention
The related figure of degree；
Fig. 7 is in embodiment 5 using the gas working medium P-V curve graph of the α type Stirling engine of heater of the present invention.
Description of symbols:
1- heater；A- thermal storage member；B- tube body；3- tube body；
2- porous media；The phase change element that 4- phase-change material is constituted；5- silk screen；6- wire；7- casing；8- accumulation of heat material
Material；
10- expansion chamber；11- regenerator；12- cooler；13- compression chamber.
Specific embodiment
In conjunction with following specific embodiments and attached drawing, the present invention is described in further detail.Realization of the invention is not
It is limited to following embodiments, within the knowledge of those skilled in the art under used the technology of the present invention design
Various modifications, transformation, combination and improvement all belong to the scope of protection of the present invention.
Fig. 1 show the structural schematic diagram being applied to heater 1 of the invention in α type Stirling engine.Gas work
For matter by external heat source heating (not shown) in heater 1, gas working medium expanded by heating pushes the piston in expansion chamber 10 to do
Function, during this, gas keeps temperature-resistant under external Source；Then, the piston of expansion chamber 10 and compression chamber 13
Piston synchronous into diagram right direction it is mobile, gas working medium enters regenerator 11 and is stored in partial heat wherein, carries out etc.
Hold cooling procedure；It is compressed into the gas working medium after compression chamber 13 in the case where the piston in compression chamber 13 pushes, the heat of generation
It is absorbed by cooler 12；Regenerator 11 is flowed counterflow through by compressed gas working medium again, after regenerator 11 absorbs certain heat,
Heater 1 is entered back into absorb heat from external heat source and enter the acting of expansion chamber 10.So in cycles, it is driven in external heat source
Lower Stirling engine exports mechanical work outward.Heater 1 is made of thermal storage member a and tube body b, and thermal storage member a is located at by pipe
Body b is formed by chamber, and the gas working medium inside Stirling engine is due to compressed in Stirling gas recycle process
The heat of compression entrained by the gas working medium as entering 1 chamber of heater that journey generates, can be inhaled by the thermal storage member a in heater 1
It receives and stores, to cause temperature excessively high after avoiding gas working medium from absorbing the heat of compression, prevent gas working medium to heater 1 and pipe
The wall surface of body b, which generates heat temperature raising effect, to be caused to be more than that operating temperature or even excessive temperature cause booster.When gas working medium is because swollen
It is swollen and when cooling down, the heat of storage can be released and be absorbed by gas working medium by thermal storage member a.Thus the present invention subtracts
The temperature fluctuation of gas working medium in small heater extends heating tube lifetime to reduce the heat fatigue of heater.
Meanwhile in the case where given heating tube runs maximum temperature, the present invention is provided with the heater 1 of thermal storage member a
The gas working medium hot-fluid being able to bear is bigger；Alternatively, since storage heater 1 of the present invention can be in the external heat source of higher temperature
Lower work, to improve the complete machine output work and efficiency of Stirling engine significantly.
Embodiment 1
As shown in Fig. 2, storage heater 1 includes two parts: (storage i.e. of the invention of porous media 2 in the present embodiment
The tube body 3 of thermal part a) and heater 1.Thermal storage member a uses porous media 2 made of metal, predominantly heap herein
One or more combinations of folded silk screen, metallic fiber, foam metal, sintering metal etc. are constituted.Porous media 2 is set to heater
Within the chamber that 1 tube body 3 is formed, heat accumulation and heat release are carried out in the way of metal sensible heat.The tube body 3 of heater 1 can be by not
Rust Steel material is made, and plays a supporting role simultaneously to thermal storage member a (namely porous media 2).
In the present invention, by the arrangement porous media 2 in the chamber that tube body 3 is formed, biggish heat exchange area can have,
It can be realized good heat transfer effect between gas working medium and thermal storage member a.By using the porous media 2 of metal material as storage
Thermal part a can make full use of metal sensible heat mode to carry out heat accumulation and heat release, meanwhile, compare table with larger using porous media
This feature of area, it is ensured that thermal storage member has bigger heat exchange area, makes to have between gas working medium and thermal storage member a good
Heat transfer effect.In addition, according to field-synergy theory: the convection heat transfer intensity of fluid depends on the association of its velocity field and heat flow field
Same degree, under identical boundary condition, velocity field cooperates with degree higher with heat flow field, then heat transfer intensity is bigger.This reality
It applies in example, by arranging the thermal storage member a of 2 structure of porous media, gas working medium radial temperature point in the chamber that tube body 3 is formed
Cloth tends to homogenize, and air-flow is in the indoor temperature gradient direction of chamber that tube body 3 is formed closer to axial direction.That is, gas working medium
The angle of velocity field and heat flow field reduces, and heat convection significantly increases.Thus, the present invention passes through in the chamber that tube body 3 is formed
Arrange porous media 2, in addition to can be realized in heater 1 to gas working medium carry heat heat accumulation and exothermic effects solution by
In system other than booster problem caused by the inevitable existing heat of compression, adding for Stirling engine is also effectively enhanced
The heat convection of gas working medium in hot device promotes the heat exchange between gas working medium and external heat source.
Embodiment 2
All parts title and effect in embodiment 2, part same as Example 1 no longer repeats, only needle one by one
To the description difference of property.
As the deformation of porous media 2 in embodiment 1, as shown in figure 3, the thermal storage member a in the present embodiment is used by phase
Become the phase change element 4 that material is constituted.Specifically, phase change element 4 is made of multiple phase transformation capsules, and phase transformation capsule is stacked in adding
In the chamber that the tube body 3 of hot device 1 is formed, both ends are fixed by stainless steel cloth 5, prevent the phase change element 4 being made of phase-change material
The tube body 1 of heater 1 is flowed out with gas working medium Oscillation Flows.In other embodiments, silk screen conduct will optionally be stacked
The phase change element 4 that phase-change material is constituted is arranged in and stacks among the skeleton that silk screen is formed by support construction.
The phase transformation capsule used in the present invention be using phase-change material as capsule-core, with organic or inorganic polymer, macromolecule and
Metal (being also possible to metal alloy) etc. is a kind of graininess energy storage material made of cyst wall.Phase-change material has biggish specific heat
Hold and specific surface area, heat exchange property are good；Compared with sensible heat heat accumulation, the present invention adding as thermal storage member a using phase change element 4
Hot device 1 has the advantages that storage density is big, temperature fluctuation is small.By regarding phase change element 4 as thermal storage member a, phase transformation material is utilized
The latent heat of material makes thermal storage member a have bigger storage density, can reduce thermal storage member a in the tube body 3 of heater 1 to gas
The resistance that body Working fluid flow generates, further increases heat exchange efficiency between gas working medium and thermal storage member a.
Working principle and process to heater in the present embodiment for example, such as when gas working medium from heater 1 to
When regenerator 11 and cooler 12 flow, 1 internal gas working medium of heater is compressed, and a part of heat of compression is generated.Due at this time
Gas working medium temperature is higher, and phase transformation capsule absorbs a part of heat of compression that gas working medium carries to reduce its temperature, keeps heating
The normal temperature difference between the tube wall and gas of the tube body 3 of device 1 is beneficial to prevent gas working medium and generates heat effect to tube wall, rises
The temperature of high 1 tube body 3 of heater even results in booster.During being somebody's turn to do, the cyst wall of phase transformation capsule uses higher melting-point material, protects
Hold solid-state；The capsule-core phase-change material slightly lower using fusing point, heat absorption generates phase transformation by Solid State Transformation under the influence of high-temperature gas working medium
For liquid.When gas working medium is flowed from cooler 12 and regenerator 11 to heater 1,1 internal gas Temperature of Working of heater
Lower, phase transformation capsule discharges the heat that previous process absorbs at this time, and phase transformation capsule-wall is still solid-state, capsule-core discharge heat by
Liquid is changed into solid-state, heats to realize to gas working medium, is beneficial to prevent the pipe of cryogenic gas working medium and heater 1
Excessive temperature differentials, alternate stress are excessive between wall, to reduce the heat fatigue of heater and extend its tubing service life.
Embodiment 3
All parts title and effect in embodiment 3, part same as Example 1 no longer repeats, only needle one by one
To the description difference of property.
As shown in figure 4, thermal storage member a uses wire 6 in the present embodiment.The processing technology of wire is simple, cost
It is cheap, and it is easy to adjust the whole thermal capacity of thermal storage member a by adjusting wire thickness or quantity.Wire 6 is arranged
In heater 1 is managed, it is not directly contacted with the tube wall of tube body 3, with the tube body 3 and gas Working fluid flow direction phase with heater 1
Mutually parallel mode is set in the chamber of heater 1.The both ends of wire 6 are welded in the two sides inside 1 tube body 3 of heater
To realize fixation.Compared with the thermal storage member of 2 form of porous media, metal wire structure used by the present embodiment can be effective
Reduce the flow resistance of gas working medium.
In addition, in practical applications, since porous media is easy directly to contact with the generation of the tube wall of the tube body 3 of heater 1,
So that porous media can be able to maintain in higher temperature in cycle period in many cases, and gas working medium is carried through compression
The temperature when heat of compression is also very high, causes the temperature difference between the thermal storage member of porous media and gas working medium smaller, limits porous Jie
The quantity of heat storage of the thermal storage member of matter.The present embodiment by alternatively use 6 form of wire thermal storage member, can be avoided its with
The tube wall of heater 1 directly comes into contact in a large area, and wire 6 is not contacted with chamber inner wall, can prevent the scraping with inner wall and lead
The inner wall of cause damages；Meanwhile because thermal storage member wire 6 directly will not absorb the heat from external heat source from chamber inner wall
Amount, keeps the solid temperature of wire 6 lower, it is made to be mainly used for the compression that gas working medium is generated by compression in absorption chamber
Heat.Thus increase the heat transfer temperature difference with gas working medium, increase the quantity of heat storage of thermal storage member.
Above description thermal storage member a uses the basic implementation of wire 6, and the thermal storage member as shown in Fig. 4 (a) is gold
Belong to the ideograph of silk.In addition, Fig. 4 (b) be the helical schematic diagram of wire, Fig. 4 (c) be wire surface have groove and
The schematic diagram of protrusion, partial enlarged view, Fig. 4 (e) that Fig. 4 (d) is wire shown in Fig. 4 (c) are that wire surface has screw thread
Schematic diagram, Fig. 4 (f) be Fig. 4 (e) shown in wire the schematic diagram faced with section view angle.In Fig. 4 shown in (b)-(f),
Wire 6 further twist, or on its surface has helicitic texture, and/or protrusion and/or groove.By by metal
6 structure setting of silk itself are spiral shape, can increase the heat exchange between thermal storage member a and gas working medium in certain cavity space
Area.Or increase setting helicitic texture, and/or protrusion and/or groove on 6 surface of wire, further make to promote Working medium gas
With the heat transfer between wire 6, thermal storage member a heat absorption and exothermic efficiency are improved.Further, wire 6 and its surface are set
The helicitic texture or protrusion or groove structure set can destroy the flow field of gas working medium in the tube body 3 of heater 1, destroy flowing
Boundary layer, the heat transfer and the heat exchange between external heat source for strengthening gas working medium itself.
Embodiment 4
All parts title and effect in embodiment 4, part same as Example 1 no longer repeats, only needle one by one
To the description difference of property.
As shown in figure 5, cooperation combination of the thermal storage member a using casing 7 and heat-storing material 8.The caliber of metal sleeve 7 is less than
The caliber of 1 tube body 3 of heater, and be arranged in the tube body 3 of heater 1.Casing 7 and the tube wall of tube body 3 are not directly contacted with, and
It is parallel to each other with tube body 3 and gas Working fluid flow direction, enables gas working medium from the tube wall and metal of the tube body 3 of heater 1
It is flowed through in circular passage between casing 7, heat-storing material is arranged in metal sleeve 7.It configures by using casing 7 and wherein
The mode of heat-storing material 8, can preprocessing good thermal storage member a in advance, will be fitted directly into together with the casing 7 of heat-storing material 8 plus
In hot device 1, processing performance and assembly performance are improved.
7 separate gas working medium of metal sleeve and heat-storing material play the role of support and protect heat-storing material, in the present invention
Suitable shell material can use heating conduction and the good stainless steel of heat resistance.
In the present invention suitable heat-storing material 8 include sensible heat heat-storing material, latent heat storage material and chemical heat storage material it
It is any.There is no particular restriction for the heat-storing material 8 in casing 7 by the present invention, such as then can be by set using porous media
While the fixed porous media of pipe 7, using the flow path and porous media formed between chamber inner wall and sleeve outer wall from figure
At flow path, the heat transfer between Lai Shixian gas working medium and porous media then may be used when using phase-change material or chemical heat storage material
With casing is closed at both ends, it is made also to double as the container of heat-storing material.Sensible heat heat-storing material includes stainless steel, Li2O、Al2O3With
TiO2The mixing material of equal high temperature sinter molding；Latent heat storage material includes Mg (NO3)2·6H2O、KNO3, dodecanol, palm
Acid, tetradecane etc..In addition, chemical heat storage material be by chemical reaction in chemical bond fracture recombination realize energy storage and
A kind of heat-storing material of release stores energy by the endothermic reaction, and back reaction releases energy.With other sensible heat accumulation of heats and latent heat
Accumulation of heat is compared, and chemical heat storage density is about 5 times of latent heat, 10 times of sensible heat, and chemical bond is stable, energy loss is small, therefore structure
At good heat-storing material.Suitable chemical heat storage material includes sulfur trioxide, ethyl alcohol, magnesia in the present invention, cobalt oxide and
Copper oxide etc..
In Fig. 5, Fig. 5 (a) is the schematic diagram that sleeve surface has groove and protrusion, and Fig. 5 (b) is casing shown in Fig. 5 (a)
Partial enlarged view, Fig. 5 (c) are that sleeve surface has threaded schematic diagram, and Fig. 5 (d) is facing and cuing open for casing shown in Fig. 5 (c)
The schematic diagram of angle.Embodiment of above indicates there is protrusion or helicitic texture in the outer wall surface of casing 7, to reinforce adding
The heat transfer effect of heat-storing material in gas working medium and casing 7 in hot device 1.
Embodiment 5
As shown in Figure 1, illustrating heater of the present invention answering in Stirling engine by taking α type Stirling engine as an example
With.α type Stirling engine is made of expansion chamber 10, heater 1, regenerator 11, cooler 12 and compression chamber 13, gas working medium
Heat is absorbed in heater 1, in expansion chamber 10 after expansion work, flows through regenerator 11, a part of gas working medium is stored and takes
The heat of band, and the cooling compression in cooler 12 and compression chamber 13, reversely flow through regenerator 11 later, absorb in regenerator 11
Heat, and thermally expanded in heater 1 and 10 interior suction of expansion chamber, and so on.
During gas working medium is compressed in gas circulation, the heat of compression can be generated, gas working medium temperature is caused to increase.
In 1 part of heater, the heat that gas working medium compression generates is absorbed by thermal storage member a, is avoided gas working medium temperature excessively high and is led
Cause the tube body b of heater 1 instead by the gas working medium heating even excessively high initiation booster of temperature.And after gas working medium expansion, gas
Flowing temperature reduces, and the interior thermal storage member a of heater 1 discharges heat at this time, and air-flow absorbs heat and heats up, and avoids gas flow temperature
It is too low, to avoid thermal stress damage caused by 1 pipe inside and outside wall excessive temperature differentials of heater.Thus, the present invention is by heating
Thermal storage member a is arranged in device 1 can reduce gas working medium bring temperature fluctuation in compression and expansion process, avoid heater
1 tube body b booster due to temperature is excessively high, or lost because of heat fatigue and thermal stress.
In addition, adding in the identical situation of metal material highest bearing temperature of the tube body b of heater 1 using suitable
Thermal storage member a made of the heat-storing material of form, the hot-fluid for enabling the tube body b of heater 1 to bear are bigger；Or heater 1 can
To work under the external heat source of higher temperature, the complete machine that is significantly increased output work and efficiency.
For heater booster problem, researcher of the present invention has found through simulated experiment, is arranged using isothermal wall surface, makes
Wall surface is maintained under conditions of 900K, and the temperature that gas working medium has just enter into heater is 871K.It is internal due to the presence of the heat of compression
Gas working medium maximum temperature can reach 951K, more than the wall surface operating temperature of system nominal.By wire form in embodiment 3
Thermal storage member a addition be set in heater 1 after, by numerical value calculate discovery gas working medium maximum temperature by above-mentioned 951K
Drop to 908K, circulation ratio shared by the overtemperature time is down to 0.119 from 0.25, reduces half, and temperature fluctuation amplitude is from 160K
It is reduced to 58K, as shown in Figure 6.It can be seen that storage heater of the present invention is applied in Stirling engine, drop significantly
The low risk of heater and its tube body heat fatigue, improves the service life of heater.The heater of thermal storage member is set
Tube body mean temperature gets a promotion, and rises to 872K (Fig. 6) from 852K；Corresponding circulation indicated work is also increased to from 1.72kW
2.23kW increases 29.7%, and the thermal efficiency increases by 3.1%, as shown in Figure 7.
Above the heater to the Stirling engine provided by the present invention with thermal storage member and its course of work into
Detailed description is gone.For those of ordinary skill in the art, to its institute under the premise of without departing substantially from true spirit
Any obvious change done will all belong to the protection scope of the invention patent power.
Claims (10)
1. a kind of heater for Stirling engine, which is characterized in that including
Tube body and the chamber formed by tube body are provided with thermal storage member in the chamber,
The expansion chamber of one end connection Stirling engine of the tube body, the other end connect the regenerator of Stirling engine,
The thermal storage member contacts with gas working medium and changes its flow behavior, strengthen gas working medium and the tube body wall surface it
Between heat exchange, promote heat absorption of the gas working medium in the heater；The thermal storage member absorbs and stores the expansion simultaneously
The heat of compression entrained by gas working medium in chamber due to being generated by compression.
2. being used for the heater of Stirling engine as described in claim 1, which is characterized in that the thermal storage member is porous
Medium includes at least and stacks one of silk screen, metallic fiber, foam metal or sintering metal.
3. as described in claim 1 be used for Stirling engine heater, which is characterized in that the thermal storage member include by
The phase change element that phase-change material is constituted, and for the phase change element to be fixed on the indoor silk screen of the chamber.
4. being used for the heater of Stirling engine as described in claim 1, which is characterized in that the thermal storage member is metal
Silk.
5. as claimed in claim 4 be used for Stirling engine heater, which is characterized in that the wire with it is described
Tube body is parallel and the mode that is not in contact is set in the chamber.
6. being used for the heater of Stirling engine as claimed in claim 4, which is characterized in that the wire is twist
Or there is helicitic texture and/or protrusion and/or groove on its surface.
7. being used for the heater of Stirling engine as described in claim 1, which is characterized in that the thermal storage member includes set
The heat-storing material of pipe and configuration in described sleeve pipe；Described sleeve pipe is mounted in the chamber, in chamber inner wall and sleeve outer wall
Between formed for the gas working medium flowing flow path.
8. being used for the heater of Stirling engine as claimed in claim 7, which is characterized in that the heat-storing material is porous
Medium or phase-change material or chemical heat storage material.
9. being used for the heater of Stirling engine as claimed in claim 7, which is characterized in that the outer wall of described sleeve pipe has
Protrusion or helicitic texture.
10. a kind of stirling cycle system uses described in any item heaters of such as claim 1-9, which is characterized in that institute
Stating stirling cycle system further includes expansion chamber and compression chamber, is provided with backheat between the expansion chamber and the compression chamber
Device, is arranged the heater in expansion chamber side, and cooler is arranged in compression chamber side；The thermal storage member is for absorbing and storing up
Deposit the heat of compression entrained by the gas working medium in the expansion chamber due to being generated by compression.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201810205051.6A CN110273778B (en) | 2018-03-13 | 2018-03-13 | Heater for Stirling engine and Stirling cycle system |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810205051.6A CN110273778B (en) | 2018-03-13 | 2018-03-13 | Heater for Stirling engine and Stirling cycle system |
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| CN110273778B CN110273778B (en) | 2024-04-09 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113466691A (en) * | 2021-06-18 | 2021-10-01 | 哈尔滨工程大学 | Prediction method for power generation efficiency of two-stage compression expansion generator |
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| JPH07180921A (en) * | 1993-12-24 | 1995-07-18 | Toshiba Corp | Stirling cold storage box |
| JPH08296501A (en) * | 1995-03-02 | 1996-11-12 | Aisin Seiki Co Ltd | Heater for stirling engine |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113466691A (en) * | 2021-06-18 | 2021-10-01 | 哈尔滨工程大学 | Prediction method for power generation efficiency of two-stage compression expansion generator |
| CN113466691B (en) * | 2021-06-18 | 2022-02-22 | 哈尔滨工程大学 | Prediction method for power generation efficiency of two-stage compression expansion generator |
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|---|---|
| CN110273778B (en) | 2024-04-09 |
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