CN113279941A - Efficient air compression device based on thermoelectric effect - Google Patents
Efficient air compression device based on thermoelectric effect Download PDFInfo
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- CN113279941A CN113279941A CN202110630265.XA CN202110630265A CN113279941A CN 113279941 A CN113279941 A CN 113279941A CN 202110630265 A CN202110630265 A CN 202110630265A CN 113279941 A CN113279941 A CN 113279941A
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- generation module
- thermoelectric
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- temperature difference
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04B—POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
- F04B41/00—Pumping installations or systems specially adapted for elastic fluids
- F04B41/02—Pumping installations or systems specially adapted for elastic fluids having reservoirs
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04B—POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
- F04B39/00—Component parts, details, or accessories, of pumps or pumping systems specially adapted for elastic fluids, not otherwise provided for in, or of interest apart from, groups F04B25/00 - F04B37/00
- F04B39/02—Lubrication
- F04B39/0284—Constructional details, e.g. reservoirs in the casing
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04B—POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
- F04B39/00—Component parts, details, or accessories, of pumps or pumping systems specially adapted for elastic fluids, not otherwise provided for in, or of interest apart from, groups F04B25/00 - F04B37/00
- F04B39/06—Cooling; Heating; Prevention of freezing
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02N—ELECTRIC MACHINES NOT OTHERWISE PROVIDED FOR
- H02N11/00—Generators or motors not provided for elsewhere; Alleged perpetua mobilia obtained by electric or magnetic means
- H02N11/002—Generators
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- H—ELECTRICITY
- H10—SEMICONDUCTOR DEVICES; ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
- H10N—ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
- H10N10/00—Thermoelectric devices comprising a junction of dissimilar materials, i.e. devices exhibiting Seebeck or Peltier effects
- H10N10/10—Thermoelectric devices comprising a junction of dissimilar materials, i.e. devices exhibiting Seebeck or Peltier effects operating with only the Peltier or Seebeck effects
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
- Y02E60/16—Mechanical energy storage, e.g. flywheels or pressurised fluids
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- Engineering & Computer Science (AREA)
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Abstract
The invention discloses a high-efficiency air compression device based on thermoelectric effect, wherein an air compressor comprises a shell and an exhaust pipe, one end of the exhaust pipe is communicated with the air compressor, and the other end of the exhaust pipe is communicated with an air storage device, and the high-efficiency air compression device comprises: the temperature difference power generation module is made of semiconductor thermal materials, one end of the temperature difference power generation module is in heat conduction connection with a shell of the air compressor and/or the exhaust pipe, and the other end of the temperature difference power generation module is arranged in a normal temperature environment or in heat conduction connection with the cooling device; and the electricity storage module is in point connection with the temperature difference power generation module and forms an electricity storage loop. The thermoelectric generation module is directly arranged between the air compressor and the air storage device, heat generated by the air compressor is conducted to the shell and the exhaust pipe and then can be directly contacted with the hot end of the thermoelectric generation module, the temperature difference is quickly formed at the two ends of the thermoelectric generation module to generate electric energy, and the electric energy is stored in the electric storage device, so that low-quality waste heat generated by the air compressor is efficiently utilized, and the thermoelectric generation module has a good application prospect and a good application range.
Description
Technical Field
The invention relates to the technical field of industrial compressed air, in particular to a high-efficiency air compression device based on thermoelectric effect.
Background
Compressed air is one of the most widely used power sources in the industrial field, and in most production type enterprises, the energy consumption of the compressed air accounts for 10% -35% of the total power consumption.
The air compressor can generate a large amount of compression heat during operation, and the energy consumed by the compression heat accounts for more than 85% of the operating power of the unit. Wherein, a part of heat enters the exhaust pipe of the air machine, the exhaust temperature is about 80-120 ℃, the waste heat belongs to low-quality waste heat, the waste heat is generally less than 230 ℃, the availability factor is low, and most of heat is released into the atmosphere through the air cooling or water cooling system of the unit, thereby not only causing the waste of resources, but also polluting the environment. Therefore, the utilization rate of the energy consumption of the compressor is improved, and the recovery of low-quality waste heat has very important significance for industrial energy conservation.
The semiconductor thermoelectric power generation is a device for converting heat energy into electric energy by utilizing a Seebeck effect, two different types of semiconductor thermoelectric materials, namely a P type thermoelectric material and an N type thermoelectric material (the P type thermoelectric material is a hole-rich material, and the N type thermoelectric material is an electron-rich material), are connected to form a PN junction, one end of the PN junction is in heat conduction connection with a high-temperature environment, the other end of the PN junction is placed in a low-temperature environment, and the hole (electron) concentration of the high-temperature end of the P (N) type material is higher than that of the low-temperature end under the action of thermal excitation, so that under the drive of the concentration gradient, the hole and the electron begin to diffuse to the low-temperature end, thereby forming electromotive force.
In view of the above situation, those skilled in the art propose to solve the problem of low-quality waste heat utilization by using semiconductor thermoelectric power generation, and patent 201521138716.4 proposes to flow high-temperature and high-pressure air into another thermoelectric power generator through a pipeline to utilize thermoelectric power generation, which has the following problems: the waste heat quality of the air compressor is not high, and most of waste heat is wasted by pipeline transportation, so that the feasibility of generating electricity by utilizing temperature difference is not high;
in view of this, how to provide a semiconductor temperature difference power generation device with a high utilization rate of low-quality waste heat of an air compressor is a technical problem that needs to be solved urgently by those in the art.
Disclosure of Invention
The present invention is directed to solving, at least to some extent, one of the above-mentioned problems in the prior art.
One objective of the present invention is to provide an efficient air compression device based on thermoelectric effect, wherein the air compressor comprises a housing and an exhaust pipe, one end of the exhaust pipe is communicated with the air compressor, and the other end of the exhaust pipe is communicated with an air storage device, the air compression device comprises:
the temperature difference power generation module is made of a semiconductor thermal material, one end of the temperature difference power generation module is in heat conduction connection with a shell of the air compressor and/or an exhaust pipe, and the other end of the temperature difference power generation module is arranged in a normal temperature environment or in heat conduction connection with a cooling device;
and the electricity storage module is in point connection with the thermoelectric generation module and forms an electricity storage loop.
The invention has the beneficial effects that:
the thermoelectric generation module is directly arranged between the air compressor and the air storage device, heat generated by the air compressor is conducted to the shell and the exhaust pipe and then can be directly contacted with the hot end of the thermoelectric generation module, the temperature difference is quickly formed at the two ends of the thermoelectric generation module to generate electric energy, and the electric energy is stored in the electric storage device, so that low-quality waste heat generated by the air compressor is efficiently utilized, and the thermoelectric generation module has a good application prospect and a good application range.
In the technical scheme, the other end of the temperature difference power generation module can also be arranged in a low-temperature environment, and the temperature of the low-temperature environment can be flexibly adjusted according to the temperature of the hot end of the temperature difference power generation module.
Furthermore, the semiconductor thermal material specifically adopted by the temperature difference power generation module is determined by the temperature difference at two ends, and the optimal value of the temperature difference power generation material
(in the formula, alpha is a Seebeck coefficient, sigma is electric conductivity, and lambda is thermal conductivity) is higher;
under the low temperature difference (300-500K), the following power generation materials can be adopted, Bi2Te5The thermoelectric figure of merit at around room temperature reaches 1 (the corresponding thermoelectric conversion efficiency is about 7% -8%), which is widely used and well studied at present, and is not described herein; sb2Te3The alloy formed by the material and Ag element has relatively excellent thermoelectric performance, and when the alloy is 478K, the material (Ag)0.365Sb0.558Te)0.025-(Bi0.5Sb1.5Te3)0.975The thermoelectric figure of merit of (1.1); (Cu) prepared by SPS (spark plasma engineering) technique4Te3)x-(Bi0.5Sb1.5Te3)1-xThe material has larger electrical conductivity and low lattice thermal conductivity, meanwhile, the Seebeck coefficient of the material linearly increases with the increase of temperature, and the material shows better thermoelectric performance when x is 0.025 and the temperature is 474K, and the thermoelectric merit reaches 1.26.
Also can be a brand new heat-sensitive crystal material formed by combining guanidine ions and ferrous cyanide ions, namely ferrous cyanide potassium guanidine hydrate (K)2(C(NH2)3)2Fe(CN)6·6H2O) has low lattice energy and high entropy of dissolution, and shows excellent solubility temperature sensitivity. Under the condition of 50 ℃ temperature difference, 47 times of ion concentration difference can be formed at two ends of the thermal battery, and the corresponding Seebeck coefficient is 1.4mV K of a reference system-1Increased to 3.73mV K-1The carnot cycle efficiency can reach 11.1%.
The following power generation materials can be adopted under the medium-temperature difference (500-900K), the maximum thermoelectric figure of merit of the PbTe system can reach 0.8, and the system is relatively mature to be researched and is not described any more; single crystal clathrate of Ba8Ga16-xCuxSn30(x ═ 0.033) having a thermoelectric figure of merit at 540K of up to 1.35; ag0.99Na0.01SbTe2.02In the material, Na atoms replace part of Ag atoms to occupy lattice points, and the thermoelectric figure of merit reaches 1.50 when the temperature is 570K; sn (tin)0.97Na0.03When the temperature of the Se material is 800K, the thermoelectric figure of merit exceeds 2; high quality beta-phase nanosheet Cu synthesized by hydrothermal method2Se, after being treated by overdischarge plasma sintering (SPS), the ZT value reaches 1.82 at about 850K, and can reach 2.62 when being doped with Al.
Yb can be adopted as the high-temperature difference (900-1200K) power generation material14MnSb11The large molecular mass makes it possess very low thermal conductivity at room temperature. The low thermal conductivity makes its ZT value at 1200K about 1.0; cu made by hot pressing and plasma sintering2Se, along with temperature rise, the high mobility and liquid phase flow behavior of Cu ions enable the lattice thermal conductivity to be reduced to 0.4-0.6W/mK. The ZT value can reach 1.5 at 1000K; liquid phase Cu is prepared by hot pressing and plasma sintering (SPS)2-xS, the thermal conductivity of the alloy is lower than 0.6W/mK within the range of 300-1000K), and when the thermal conductivity is 1000K, Cu1.97The ZT value of S can reach 1.7.
Preferably, the thermoelectric generation module is abutted against the exhaust pipe or extends into the exhaust pipe or is connected with the exhaust pipe through a heat conduction connecting piece.
The thermoelectric power generation module is characterized by further comprising a jacket, wherein the jacket is sleeved on the outer surface of the shell, a heat transfer pipeline is arranged in the jacket, a heat transfer medium is filled in the heat transfer pipeline, and the heat transfer pipeline is connected with the thermoelectric power generation module.
The jacket can achieve good heat transfer effect through the heat transfer pipeline on one hand, and can prevent heat on the shell from being released into the atmosphere on the other hand.
Furthermore, the thermoelectric generation modules are provided with a plurality of groups, and the plurality of groups of thermoelectric generation modules are connected in series.
Further, still include oil-gas separation device and oil extraction pipe, oil-gas separation device sets up on the blast pipe, oil-gas separation device's an oil end with the oil extraction union coupling, the oil extraction pipe with thermoelectric generation module heat conduction is connected.
Lubricating oil is required to be added when part of the air compressor operates, the oil-gas separation device has the functions of cooling, absorbing compression heat, sealing and lubricating and can separate oil from gas, the lubricating oil also has certain heat after being separated, and different temperature difference power generation modules can be respectively connected with the exhaust pipe and the oil discharge pipe in a heat conduction mode.
Preferably, a heat insulation layer is arranged outside the exhaust pipe. The thermal insulation layer also prevents the heat of the exhaust pipe from being directly applied to the atmosphere to cause heat loss.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below, it is obvious that the drawings in the following description are only embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the provided drawings without creative efforts.
FIG. 1 is a schematic structural view;
FIG. 2 is a schematic view of a structure of an air compressor with a jacket;
FIG. 3 is a schematic structural diagram of a device with oil-gas separation;
the system comprises a gas storage device, a gas exhaust pipe, a gas compressor, a gas storage device, a temperature difference power generation module, a first temperature difference power generation module, a second temperature difference power generation module, a first power storage module, a second temperature difference power generation module, a jacket, a gas-oil separation device and an oil exhaust pipe, wherein the gas exhaust pipe is 1-2-the gas compressor, the gas storage device is 3-the gas storage device, the temperature difference power generation module is 4-the second temperature difference power generation module, the gas-oil separation device is 7-the jacket, and the oil exhaust pipe is 8-the oil exhaust pipe.
Detailed Description
Reference will now be made in detail to embodiments of the present invention, examples of which are illustrated in the accompanying drawings, wherein like or similar reference numerals refer to the same or similar elements or elements having the same or similar function throughout. The embodiments described below with reference to the drawings are exemplary and intended to be illustrative of the present invention and should not be construed as limiting the present invention.
In the description of the present invention, it is to be understood that the terms "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc. indicate orientations or positional relationships based on those shown in the drawings, and are only for convenience of description and simplicity of description, and do not indicate or imply that the referenced devices or elements must have a particular orientation, be constructed and operated in a particular orientation, and thus, are not to be construed as limiting the present invention.
Furthermore, the terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of the present invention, "a plurality" means two or more unless specifically defined otherwise.
In the present invention, unless otherwise expressly stated or limited, the terms "mounted," "connected," "secured," and the like are to be construed broadly and can, for example, be fixedly connected, detachably connected, or integrally formed; can be mechanically or electrically connected; they may be directly connected or indirectly connected through intervening media, or may be connected through the interiors of two elements or through the mutual relationship of two elements. The specific meanings of the above terms in the present invention can be understood by those skilled in the art according to specific situations.
In the present invention, unless otherwise expressly stated or limited, "above" or "below" a first feature means that the first and second features are in direct contact, or that the first and second features are not in direct contact but are in contact with each other via another feature therebetween. Also, a first feature being "on," "over," and "above" a second feature includes the first feature being directly on and obliquely above the second feature, or simply means that the first feature is higher in level than the second feature. A first feature being "under," "below," and "beneath" a second feature includes the first feature being directly under and obliquely below the second feature, or simply meaning that the first feature is at a lesser elevation than the second feature.
Example 1
As shown in fig. 1, an embodiment of the present invention discloses a high efficiency air compression device based on thermoelectric effect, an air compressor 2 includes a housing and an exhaust pipe 1, one end of the exhaust pipe 1 is communicated with the air compressor 2, and the other end is communicated with an air storage device 3, including:
the temperature difference power generation module 4 is made of a semiconductor thermal material, one end of the temperature difference power generation module 4 is in heat conduction connection with the shell of the air compressor 2 and/or the exhaust pipe 1, and the other end of the temperature difference power generation module is arranged in a normal temperature environment or in heat conduction connection with a cooling device;
and the electricity storage module 5 is connected with the temperature difference power generation module 4 in a point manner to form an electricity storage loop.
In the present embodiment, the thermoelectric generation module 4 is directly connected to the exhaust pipe 1.
In some embodiments, there are multiple sets of thermoelectric generation modules 4, with the multiple sets of thermoelectric generation modules 4 being connected in series.
In some embodiments, the exhaust pipe 1 is externally provided with a thermal insulation layer.
Example 2
As shown in fig. 2, in this embodiment, the thermoelectric generation module 4 is only in heat conduction connection with the casing of the air compressor 2 (the casing can only be in heat conduction connection with the casing due to a large amount of heat on the casing), a jacket 6 is added, the jacket 6 is sleeved on the outer surface of the casing, a heat transfer pipeline is arranged in the jacket 6, a heat transfer medium is filled in the heat transfer pipeline, and the heat transfer pipeline is connected with the thermoelectric generation module 4.
Example 3
As shown in fig. 3, in the present embodiment, an oil-gas separation device 7 and an oil discharge pipe 8 are added on the basis of embodiment 1, the oil-gas separation device 7 is disposed on the exhaust pipe 1, an oil outlet end of the oil-gas separation device 7 is connected to the oil discharge pipe 8, and the oil discharge pipe 8 is connected to the thermoelectric generation module 4 in a heat conducting manner.
In the present embodiment, the oil drain pipe 8 is connected to the second thermoelectric generation module 42, the exhaust pipe 1 is connected to the first thermoelectric generation module 41, and the first thermoelectric generation module 41 and the second thermoelectric generation module 42 both form an electricity storage loop with the electricity storage module 5.
In the present exemplary embodiment, the housing can also be connected in a thermally conductive manner to the second thermoelectric power module 42.
Experimental example 1
Taking the scheme disclosed in example 1 as an experimental object, the data statistics of the heat energy generated after the compression of 1L of normal temperature air are as follows:
at low temperature, a thermosensitive crystal material, namely ferrocyanide potassium guanidine hydrate is selected, and 11.1% of heat energy can be recovered to generate 5.63J of electric energy.
PbTe can be used for recovering 7% of heat energy at medium temperature and generating 16.3J of electric energy.
Yb is selected at high temperature14MnSb118% of heat energy can be recovered, and 30J of electric energy can be generated.
The invention provides a high-efficiency air compression device based on thermoelectric effect, wherein a thermoelectric generation module is directly arranged between an air compressor and an air storage device, heat generated by the air compressor is conducted to a shell and an exhaust pipe and then can be directly contacted with the hot end of the thermoelectric generation module, the temperature difference is quickly formed at the two ends of the thermoelectric generation module to generate electric energy, and the electric energy is stored in an electric storage device, so that low-quality waste heat generated by the air compressor is efficiently utilized, and the high-efficiency air compression device has good application prospect and application range.
In the description herein, references to the description of the term "one embodiment," "some embodiments," "an example," "a specific example," or "some examples," etc., mean that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the invention. In this specification, the schematic representations of the terms used above are not necessarily intended to refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples. Furthermore, various embodiments or examples described in this specification can be combined and combined by those skilled in the art.
Although embodiments of the present invention have been shown and described above, it should be understood that the above embodiments are illustrative and not restrictive, and that various changes, modifications, substitutions and alterations can be made herein by those having ordinary skill in the art without departing from the scope of the present invention.
Claims (6)
1. The utility model provides a high-efficient air compression device based on thermoelectric effect, air compressor machine (2) include casing and blast pipe (1), blast pipe (1) one end and air compressor machine (2) intercommunication, the other end and gas storage device (3) intercommunication, its characterized in that includes:
the temperature difference power generation module (4) is made of a semiconductor thermal material, one end of the temperature difference power generation module (4) is in heat conduction connection with the shell of the air compressor (2) and/or the exhaust pipe (1), and the other end of the temperature difference power generation module is arranged in a normal temperature environment or in heat conduction connection with a cooling device;
the electric storage module (5), the electric storage module (5) with the thermoelectric generation module (4) point connection and form the electric storage return circuit.
2. The efficient air compression device based on the thermoelectric effect as claimed in claim 1, wherein the thermoelectric generation module (4) is abutted against the exhaust pipe (1) or extends into the exhaust pipe (1) or is connected with the exhaust pipe (1) through a heat conducting connecting piece.
3. The efficient air compression device based on the thermoelectric effect as claimed in claim 1, further comprising a jacket (6), wherein the jacket (6) is sleeved on the outer surface of the casing, a heat transfer pipeline is arranged in the jacket (6), a heat transfer medium is filled in the heat transfer pipeline, and the heat transfer pipeline is connected with the thermoelectric generation module (4).
4. The efficient air compression device based on the thermoelectric effect as claimed in claim 1, wherein there are multiple groups of thermoelectric generation modules (4), and the multiple groups of thermoelectric generation modules (4) are connected in series.
5. The efficient air compression device based on the thermoelectric effect as claimed in claim 1, further comprising an oil-gas separation device (7) and an oil discharge pipe (8), wherein the oil-gas separation device (7) is disposed on the exhaust pipe (1), the oil outlet end of the oil-gas separation device (7) is connected with the oil discharge pipe (8), and the oil discharge pipe (8) is in heat conduction connection with the thermoelectric generation module (4).
6. The efficient air compression device based on the thermoelectric effect as claimed in claim 1, wherein the exhaust pipe (1) is externally provided with a heat insulation layer.
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114992901A (en) * | 2022-06-06 | 2022-09-02 | 上海电力大学 | Cold, heat and electricity three-generation system based on hydrogen storage waste heat recovery |
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