CN115030928A - Jet pump and fuel cell system having the same - Google Patents
Jet pump and fuel cell system having the same Download PDFInfo
- Publication number
- CN115030928A CN115030928A CN202210202802.5A CN202210202802A CN115030928A CN 115030928 A CN115030928 A CN 115030928A CN 202210202802 A CN202210202802 A CN 202210202802A CN 115030928 A CN115030928 A CN 115030928A
- Authority
- CN
- China
- Prior art keywords
- insert
- jet pump
- anode
- fuel cell
- cell system
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
- 239000000446 fuel Substances 0.000 title claims abstract description 36
- 239000007789 gas Substances 0.000 claims abstract description 20
- 238000002347 injection Methods 0.000 claims description 19
- 239000007924 injection Substances 0.000 claims description 19
- 239000002184 metal Substances 0.000 claims description 3
- 230000003134 recirculating effect Effects 0.000 abstract 1
- 238000010438 heat treatment Methods 0.000 description 2
- 238000009413 insulation Methods 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- 239000007800 oxidant agent Substances 0.000 description 2
- 230000001590 oxidative effect Effects 0.000 description 2
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 2
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 239000001257 hydrogen Substances 0.000 description 1
- 229910052739 hydrogen Inorganic materials 0.000 description 1
- 125000004435 hydrogen atom Chemical class [H]* 0.000 description 1
- 238000003780 insertion Methods 0.000 description 1
- 230000037431 insertion Effects 0.000 description 1
- 239000001301 oxygen Substances 0.000 description 1
- -1 oxygen Chemical class 0.000 description 1
- 229910052760 oxygen Inorganic materials 0.000 description 1
- 239000003380 propellant Substances 0.000 description 1
- 238000005086 pumping Methods 0.000 description 1
- 239000000243 solution Substances 0.000 description 1
Images
Classifications
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04F—PUMPING OF FLUID BY DIRECT CONTACT OF ANOTHER FLUID OR BY USING INERTIA OF FLUID TO BE PUMPED; SIPHONS
- F04F5/00—Jet pumps, i.e. devices in which flow is induced by pressure drop caused by velocity of another fluid flow
- F04F5/14—Jet pumps, i.e. devices in which flow is induced by pressure drop caused by velocity of another fluid flow the inducing fluid being elastic fluid
- F04F5/16—Jet pumps, i.e. devices in which flow is induced by pressure drop caused by velocity of another fluid flow the inducing fluid being elastic fluid displacing elastic fluids
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04F—PUMPING OF FLUID BY DIRECT CONTACT OF ANOTHER FLUID OR BY USING INERTIA OF FLUID TO BE PUMPED; SIPHONS
- F04F5/00—Jet pumps, i.e. devices in which flow is induced by pressure drop caused by velocity of another fluid flow
- F04F5/44—Component parts, details, or accessories not provided for in, or of interest apart from, groups F04F5/02 - F04F5/42
- F04F5/46—Arrangements of nozzles
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04F—PUMPING OF FLUID BY DIRECT CONTACT OF ANOTHER FLUID OR BY USING INERTIA OF FLUID TO BE PUMPED; SIPHONS
- F04F5/00—Jet pumps, i.e. devices in which flow is induced by pressure drop caused by velocity of another fluid flow
- F04F5/44—Component parts, details, or accessories not provided for in, or of interest apart from, groups F04F5/02 - F04F5/42
- F04F5/48—Control
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M8/00—Fuel cells; Manufacture thereof
- H01M8/04—Auxiliary arrangements, e.g. for control of pressure or for circulation of fluids
- H01M8/04082—Arrangements for control of reactant parameters, e.g. pressure or concentration
- H01M8/04089—Arrangements for control of reactant parameters, e.g. pressure or concentration of gaseous reactants
- H01M8/04097—Arrangements for control of reactant parameters, e.g. pressure or concentration of gaseous reactants with recycling of the reactants
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M8/00—Fuel cells; Manufacture thereof
- H01M8/04—Auxiliary arrangements, e.g. for control of pressure or for circulation of fluids
- H01M8/04082—Arrangements for control of reactant parameters, e.g. pressure or concentration
- H01M8/04201—Reactant storage and supply, e.g. means for feeding, pipes
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M8/00—Fuel cells; Manufacture thereof
- H01M8/22—Fuel cells in which the fuel is based on materials comprising carbon or oxygen or hydrogen and other elements; Fuel cells in which the fuel is based on materials comprising only elements other than carbon, oxygen or hydrogen
-
- 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
- Y02E60/30—Hydrogen technology
- Y02E60/50—Fuel cells
Landscapes
- Engineering & Computer Science (AREA)
- Life Sciences & Earth Sciences (AREA)
- Sustainable Development (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- Fluid Mechanics (AREA)
- Manufacturing & Machinery (AREA)
- Sustainable Energy (AREA)
- Chemical & Material Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Electrochemistry (AREA)
- General Chemical & Material Sciences (AREA)
- Fuel Cell (AREA)
- Jet Pumps And Other Pumps (AREA)
Abstract
The invention relates to a jet pump (1) for recirculating anode gases in a fuel cell system, comprising an insert (2) that can be inserted into a housing of an anode sub-system, is configured at least in sections rotationally symmetrically with respect to a longitudinal axis (A) of the insert (2) and delimits a flow path (4) having a defined jet pump geometry for the anode gases, wherein a metering valve (3) for metering fuel into the insert (2) is integrated at one end. The invention also relates to an anode sub-system (10) and a fuel cell system having a jet pump (1) according to the invention.
Description
Technical Field
The present invention relates to a jet pump for anode gas recirculation in a fuel cell system. Furthermore, the invention relates to a fuel cell system with an inventive jet pump for anode gas recirculation.
Background
A fuel cell system comprises at least one fuel cell, by means of which a fuel, such as hydrogen, and an oxidant, such as oxygen, can be converted into electrical energy, thermal energy and water. For this purpose, the fuel cell has an anode and a cathode. In operation of the fuel cell system, the anode is supplied with fuel and the cathode is supplied with oxidant. The fuel is therefore the anode gas.
On the system side, when the anode is supplied with fuel or anode gas, such a solution has been established: the still fuel-rich anode gas leaving the fuel cell is recirculated and re-delivered to the anode along with fresh fuel. Here, an ejector pump is used as the gas conveying unit alone or in combination with a recirculation fan. The jet pump is usually integrated with other components, such as a water separator, into the anode sub-system of the fuel cell system, specifically into the housing of the anode sub-system, which at the same time forms a specific jet pump geometry. The jet pump geometry can vary depending on the user. This results in a high degree of complexity of the anode sub-system, which is therefore complex and expensive to manufacture.
Disclosure of Invention
The invention thus relates to the task of reducing complexity.
To solve this task, the ejector pump of the invention and the anode subsystem of the invention are proposed. Advantageous embodiments of the invention can be derived from the individual preferred embodiments. Furthermore, a fuel cell system with an inventive ejector pump or an inventive anode sub-system is described.
The jet pump proposed for the recirculation of anode gases in a fuel cell system comprises an insert which can be inserted into the housing of the anode sub-system, is at least partially rotationally symmetrical with respect to the longitudinal axis of the insert, and delimits a flow path for the anode gases with a defined jet pump geometry. In this case, a metering valve is integrated at one end for metering fuel into the insert.
In the proposed jet pump, the jet pump geometry is not formed by the housing of the anode sub-system receiving the jet pump, but by an at least sectionally rotationally symmetrical insert of the jet pump. Due to the at least partially rotationally symmetrical design, the insert can be produced simply and cost-effectively. Furthermore, the assembly of the ejector pump is facilitated by the insert, which is at least in sections rotationally symmetrical, since only a simple cylindrical bore, but no special geometry, is required for insertion into the housing of the anode sub-system.
When manufacturing the injection pump, the injection pump geometry can be adapted to the individual requirements specific to the user, while preserving the outer dimensions of the insert. The housing of the anode sub-system can thus be combined with a plurality of jet pumps having different jet pump geometries, to be precise without changes to the housing of the anode sub-system. As a result, the complexity of the anode sub-system can be reduced in this way. At the same time, greater flexibility is achieved in terms of different jet pump designs. Furthermore, greater freedom is obtained, for example, with regard to heat conduction or thermal insulation of the injection pump, so that icing is better prevented.
Preferably, the suction chamber is formed in a section of the insert part which is formed rotationally symmetrically to the longitudinal axis. During operation of the fuel cell system, recirculated anode gas is drawn into the suction chamber through the recirculation line. The suction chamber thus constitutes a section of the flow path of the anode gas. The connection of the recirculation line is preferably realized by means of a radial bore configured in the insert. The insert can be configured rotationally symmetrically, with the exception of the radial bores. The same applies to the suction chamber. Since the radial bore can be introduced afterwards, it does not hinder a rotationally symmetrical and therefore simple and cost-effective insert construction.
In order to further simplify the insert, it is proposed that a mixing chamber be formed in a section of the insert that is formed rotationally symmetrically to the longitudinal axis. The mixing chamber is preferably directly connected to the intake chamber. The mixing chamber thus constitutes another section of the flow path of the anode gas. Preferably, both the section of the insert forming the suction chamber and the section forming the mixing chamber are rotationally symmetrical.
Furthermore, it is proposed that a diffuser device be formed in a section of the insert part that is formed rotationally symmetrically to the longitudinal axis. The diffuser device is preferably joined directly to the mixing chamber, so that a flow path with jet pump geometry is formed by the intake chamber, the mixing chamber and the diffuser device. A particularly simple jet pump geometry is achieved if all three sections (suction chamber, mixing chamber and diffuser) are embodied rotationally symmetrically with respect to the longitudinal axis of the insert.
According to a preferred embodiment of the invention, the insert of the proposed ejector pump is configured as a rotationally symmetrical tube. In this case, the insert can be produced particularly simply and cost-effectively, for example by turning. The insert can in particular be a simple lathe.
In a further development of the invention, it is proposed that the metering valve integrated into the injection pump has a nozzle which is arranged coaxially to the longitudinal axis of the insert. Thus, the nozzle can simultaneously be used as a drive nozzle for a jet pump. Fresh fuel is dispensed through a nozzle into the intake chamber of the injection pump, wherein a propellant jet is generated which causes the desired pumping effect, so that the recirculated anode gas is drawn into the intake chamber.
The insert of the injection pump can be made at least in sections of metal and/or plastic. As a metal part, the insert can be used, in particular in combination with a heating device, for heating the flow path. Thus, with the insert ice protection can be achieved. If the insert is made of plastic, thermal insulation can be brought about by the insert.
Furthermore, an anode sub-system for a fuel cell system is proposed, which anode sub-system comprises a housing and the jet pump of the invention. The insert of the injection pump is at least partially received in a housing bore of the housing, which is at least partially cylindrical for receiving the insert. The housing bore can accommodate a plurality of injection pumps which differ in terms of injection pump geometry, since only a simple cylindrical bore is required for the reception.
According to a preferred embodiment of the invention, the angularly and/or arcuately extending section of the housing bore is connected to a cylindrical section of the housing bore. By this, it is possible to achieve a deflection of the anode gas in the direction of the inlet of the fuel cell stack connected to the anode subsystem.
Since the proposed jet pump or the proposed anode sub-system with the jet pump according to the invention is used in particular in a fuel cell system, a fuel cell system with the jet pump according to the invention or the anode sub-system according to the invention is also proposed.
Drawings
Preferred embodiments of the present invention will be described in more detail below with reference to the accompanying drawings.
Fig. 1 shows a schematic cross-sectional view of an injection pump according to the invention.
Detailed Description
The injection pump 1 shown comprises an insert 2 which delimits a flow path 4 having a defined injection pump geometry. For this purpose, the insert 2 is divided into a plurality of sections 2.1, 2.2, 2.3. In the section 2.1, the insert 2 forms a suction chamber 5. In the next section 2.2, the insert 2 forms a mixing chamber 6. Connected to the mixing chamber is a diffuser 7, which is formed by the section 2.3 of the insert 2. Thus, the flow path 4 extends through the suction chamber 5, the mixing chamber 6 and the diffuser 7. The insert 2 is currently configured rotationally symmetrically over its entire length with respect to the longitudinal axis a. Thus, the insert 2 can be a simple turned piece.
On the inlet side, i.e. in the region of the suction chamber 5, the metering valve 3 is integrated into the insert 2. Fresh fuel can be dispensed into the intake chamber 5 by means of the metering valve 3. The metering is effected here via the nozzle 8 of the metering valve 3, which simultaneously serves as a drive nozzle.
In the region of the suction chamber 5, the insert part 2 has a connection 9 to a recirculation line, through which the recirculated anode gas enters the suction chamber 5.
The insert 2 of the illustrated jet pump 1 is inserted into a cylindrical section 12.1 of a housing bore 12, which is formed in the housing 11 of an anode sub-system 10, which is arranged below a fuel cell stack 13 of the fuel cell system. In order to supply the anode gas recirculated by means of the jet pump 1 to the inlet 14 of the fuel cell stack 13, an angularly or arcuately extending section 12.2 of the housing bore 12 is connected to the cylindrical section 12.1, so that the recirculated anode gas is deflected in the direction of the inlet 14.
The injection pump 1 shown is distinguished by a defined injection pump geometry. The jet pump geometry can be varied as desired by the user without having to change the anode subsystem 10. In the housing 11 of the anode subsystem 10, only a simple housing bore 12 has to be provided for receiving the insert 2 of the jet pump 1, which can always be identically designed independently of the respective jet pump geometry of the jet pump.
Claims (10)
1. Jet pump (1) for recirculation of anode gases in a fuel cell system, comprising an insert (2) that can be inserted into a housing of an anode sub-system, is configured at least in sections rotationally symmetrically with respect to a longitudinal axis (A) of the insert (2) and delimits a flow path (4) for the anode gases with a defined jet pump geometry, wherein a metering valve (3) is integrated at one end for metering fuel into the insert (2).
2. An injection pump (1) according to claim 1,
characterized in that a suction chamber (5) is formed in a section (2.1) of the insert (2) that is formed rotationally symmetrically to the longitudinal axis (A).
3. An injection pump (1) according to claim 1 or 2,
characterized in that a mixing chamber (6) is formed in a section (2.2) of the insert (2) that is formed rotationally symmetrically to the longitudinal axis (A).
4. An injection pump (1) according to one of the preceding claims,
characterized in that a diffuser device (7) is formed in a section (2.3) of the insert (2) that is formed rotationally symmetrically to the longitudinal axis (A).
5. An injection pump (1) according to one of the preceding claims,
characterized in that the insert (2) is designed as a rotationally symmetrical tube.
6. An injection pump (1) according to one of the preceding claims,
characterized in that the metering valve (3) has a nozzle (8) which is arranged coaxially to the longitudinal axis (A) of the insert (2).
7. Jet pump (1) according to one of the preceding claims,
characterized in that the insert (2) is made at least in sections of metal and/or plastic.
8. Anode sub-system (10) for a fuel cell system, comprising a housing (11) and a jet pump (1) according to one of the preceding claims, wherein an insert (2) of the jet pump (1) is at least partially received in a housing bore (12) which is at least partially cylindrical for receiving the insert (2).
9. The anode sub-system (10) according to claim 8,
characterized in that an angularly and/or arcuately extending section (12.2) of the housing bore (12) is joined to a cylindrical section (12.1).
10. Fuel cell system with a jet pump (1) according to one of claims 1 to 7 or with an anode sub-system (10) according to claim 8 or 9.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE102021202024.0A DE102021202024A1 (en) | 2021-03-03 | 2021-03-03 | Jet pump and fuel cell system with a jet pump |
| DE102021202024.0 | 2021-03-03 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN115030928A true CN115030928A (en) | 2022-09-09 |
Family
ID=82898086
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202210202802.5A Pending CN115030928A (en) | 2021-03-03 | 2022-03-03 | Jet pump and fuel cell system having the same |
Country Status (2)
| Country | Link |
|---|---|
| CN (1) | CN115030928A (en) |
| DE (1) | DE102021202024A1 (en) |
-
2021
- 2021-03-03 DE DE102021202024.0A patent/DE102021202024A1/en active Pending
-
2022
- 2022-03-03 CN CN202210202802.5A patent/CN115030928A/en active Pending
Also Published As
| Publication number | Publication date |
|---|---|
| DE102021202024A1 (en) | 2022-09-08 |
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|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
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