CN113687035A - Tail-exhaust hydrogen concentration detection device of fuel cell system - Google Patents
Tail-exhaust hydrogen concentration detection device of fuel cell system Download PDFInfo
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- CN113687035A CN113687035A CN202111138295.5A CN202111138295A CN113687035A CN 113687035 A CN113687035 A CN 113687035A CN 202111138295 A CN202111138295 A CN 202111138295A CN 113687035 A CN113687035 A CN 113687035A
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- pipe
- tail
- fuel cell
- cell system
- hydrogen concentration
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- 239000001257 hydrogen Substances 0.000 title claims abstract description 55
- 229910052739 hydrogen Inorganic materials 0.000 title claims abstract description 55
- UFHFLCQGNIYNRP-UHFFFAOYSA-N Hydrogen Chemical compound [H][H] UFHFLCQGNIYNRP-UHFFFAOYSA-N 0.000 title claims abstract description 53
- 238000001514 detection method Methods 0.000 title claims abstract description 26
- 239000000446 fuel Substances 0.000 title claims abstract description 25
- 238000005452 bending Methods 0.000 claims abstract description 22
- 229910000831 Steel Inorganic materials 0.000 claims abstract description 21
- 239000010959 steel Substances 0.000 claims abstract description 21
- 238000003466 welding Methods 0.000 claims abstract description 14
- 238000005070 sampling Methods 0.000 claims abstract description 12
- 239000007789 gas Substances 0.000 claims description 59
- 229910001220 stainless steel Inorganic materials 0.000 claims description 5
- 239000010935 stainless steel Substances 0.000 claims description 5
- 239000002184 metal Substances 0.000 claims description 4
- 150000002431 hydrogen Chemical class 0.000 claims description 3
- 238000000034 method Methods 0.000 abstract description 3
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 9
- 239000007788 liquid Substances 0.000 description 5
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 2
- 230000007423 decrease Effects 0.000 description 2
- 239000012528 membrane Substances 0.000 description 2
- 239000003595 mist Substances 0.000 description 2
- 239000012466 permeate Substances 0.000 description 2
- 230000000704 physical effect Effects 0.000 description 2
- 238000000926 separation method Methods 0.000 description 2
- 238000009825 accumulation Methods 0.000 description 1
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 230000010354 integration Effects 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 229910052757 nitrogen Inorganic materials 0.000 description 1
- 239000001301 oxygen Substances 0.000 description 1
- 229910052760 oxygen Inorganic materials 0.000 description 1
- 229920001296 polysiloxane Polymers 0.000 description 1
- 238000002360 preparation method Methods 0.000 description 1
- 229920006395 saturated elastomer Polymers 0.000 description 1
- 238000007789 sealing Methods 0.000 description 1
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N33/00—Investigating or analysing materials by specific methods not covered by groups G01N1/00 - G01N31/00
- G01N33/0004—Gaseous mixtures, e.g. polluted air
- G01N33/0009—General constructional details of gas analysers, e.g. portable test equipment
- G01N33/0027—General constructional details of gas analysers, e.g. portable test equipment concerning the detector
- G01N33/0036—General constructional details of gas analysers, e.g. portable test equipment concerning the detector specially adapted to detect a particular component
- G01N33/005—H2
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N1/00—Sampling; Preparing specimens for investigation
- G01N1/02—Devices for withdrawing samples
- G01N1/22—Devices for withdrawing samples in the gaseous state
- G01N1/2247—Sampling from a flowing stream of gas
- G01N1/2252—Sampling from a flowing stream of gas in a vehicle exhaust
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- Chemical & Material Sciences (AREA)
- Life Sciences & Earth Sciences (AREA)
- Health & Medical Sciences (AREA)
- Engineering & Computer Science (AREA)
- Pathology (AREA)
- Physics & Mathematics (AREA)
- Analytical Chemistry (AREA)
- Biochemistry (AREA)
- General Health & Medical Sciences (AREA)
- General Physics & Mathematics (AREA)
- Immunology (AREA)
- Molecular Biology (AREA)
- Biomedical Technology (AREA)
- Combustion & Propulsion (AREA)
- Food Science & Technology (AREA)
- Medicinal Chemistry (AREA)
- Sampling And Sample Adjustment (AREA)
Abstract
The invention relates to a tail exhaust hydrogen concentration detection device of a fuel cell system, which comprises a tail exhaust pipe, a sampling bent pipe, a PTC heater and a hydrogen concentration sensor, wherein the sampling bent pipe comprises a bending pipe, a welding tee joint, an oblique steel pipe and a sensor joint, the first end of the welding tee joint is connected with the output end of the bending pipe, the second end of the welding tee joint is connected with the input end of the oblique steel pipe, the third end of the welding tee joint is connected with the sensor joint, the hydrogen concentration sensor is arranged on the sensor joint, the input end of the bending pipe is inserted into the tail exhaust pipe and welded with the pipe wall of the tail exhaust pipe, the output end of the oblique steel pipe is inserted into the tail exhaust pipe and welded with the pipe wall of the tail exhaust pipe, and a heat conduction wire is arranged in the bending pipe and is in heat conduction connection with the PTC heater. Compared with the prior art, the method has the advantages of high detection accuracy and the like.
Description
Technical Field
The invention relates to the field of fuel cells, in particular to a tail exhaust hydrogen concentration detection device of a fuel cell system.
Background
The whole fuel cell vehicle takes hydrogen as fuel. The hydrogen has the characteristics of inflammability and explosiveness, and when the volume of the hydrogen in the air is more than 4% at normal temperature and normal pressure, the hydrogen can explode when meeting a fire source. Therefore, a plurality of hydrogen concentration sensors are mounted on the fuel cell vehicle to detect the presence or absence of a risk of hydrogen leakage, accumulation, or the like. However, the detection of the hydrogen concentration sensor can be influenced by the high-humidity gas discharged from the fuel cell system and the tail of the whole vehicle, and even the detection is invalid, so that great potential safety hazards exist.
Reasons for the presence of tail gas high humidity: the mixed gas with high temperature flows out of the system and carries out part of liquid water, the temperature of the mixed gas is reduced after the mixed gas flows through various pipelines, the humidity of the mixed gas is saturated, namely, the humidity of the mixed gas reaches 100 percent along with the reduction of the temperature, and the mixed gas becomes gas with high humidity. When the mixed gas with high humidity passes through the hydrogen concentration sensor, liquid water is generated on the surface of the hydrogen concentration sensor, and the detection of the hydrogen concentration sensor on the hydrogen in the mixed gas is influenced.
Chinese patent CN108333312A discloses tail hydrogen discharge concentration detection device and fuel cell vehicle, and this patent device includes that venturi, branch pipeline, hydrogen concentration sensor, waterproof ventilated membrane etc. are arranged to the tail, mainly carries out water-gas separation to the mist through waterproof ventilated membrane, increases the mist flow of branch pipeline through venturi. The waterproof breathable film is used for separating water from gas in the mixed gas, the molecular weight of hydrogen is obviously less than that of nitrogen, oxygen and the like, the hydrogen can permeate the film more easily, and the hydrogen concentration sensor is used for detecting that the content of the hydrogen in the mixed gas is possibly higher; secondly, if the surface of the waterproof breathable film is covered with water, gas is difficult to permeate; thirdly, the resistance of the mixed gas passing through the film is large, which is not beneficial to detection and the like.
In addition, in part of the prior art, a mechanical structure is used for carrying out water-gas separation on mixed gas, the structure is complex, the occupied space is large, and the high integration of a fuel cell system and the whole vehicle is not utilized.
Disclosure of Invention
The invention aims to provide a tail exhaust hydrogen concentration detection device of a fuel cell system.
The purpose of the invention can be realized by the following technical scheme:
a tail exhaust hydrogen concentration detection device of a fuel cell system comprises a tail exhaust pipe, a sampling bent pipe, a PTC heater and a hydrogen concentration sensor,
the sample return bend is including bending the pipe, welding tee bend, bevel connection steel pipe and sensor joint, the first end of welding tee bend is connected with the output of the pipe of bending, and the second end is connected with the input of bevel connection steel pipe, and the third end is connected with the sensor articulate, hydrogen concentration sensor install in on the sensor joint, the input of the pipe of bending insert to the tail calandria in and with the pipe wall welding of tail calandria, the output of bevel connection steel pipe insert to the tail calandria in and with the pipe wall welding of tail calandria, be equipped with the conducting wire in the pipe of bending, this conducting wire is connected with PTC heater heat-conduction.
The PTC heater wraps the outer side of the bending pipe, and the heat conducting wires are in heat conduction connection with the PTC heater through the bending pipe.
The heat conducting wires are supported on the inner wall of the bending pipe.
The inclined plane of the output end of the bevel steel pipe is arranged towards the outlet side of the tail discharge pipe.
The tail calandria is a stainless steel pipe.
The angle of the inclined plane at the output end of the inclined steel pipe is 30-60 degrees.
The bending pipe comprises an inlet section, a steering section and a straight pipe section which are connected in sequence, and the inlet section and the straight pipe section are parallel to the direction of the tail pipe bank.
The PTC heater is wrapped on the straight pipe section.
The sampling bent pipe is a metal pipe.
The heat conducting wires are in a net shape.
Compared with the prior art, the invention has the following beneficial effects:
1. long service life, safe and reliable: the device is mainly formed by welding mechanical structural parts, and has long service life; all the interfaces of the device are welded, so that the sealing performance is good, and the possibility of hydrogen leakage is extremely low; the PTC heater can automatically control the temperature, the surface does not generate the red phenomenon, and the PTC heater can be applied to a hydrogen environment.
2. Physical properties according to gas humidity and temperature: the PTC heats the mixed gas, so that the humidity of the mixed gas is reduced, and the detection of the hydrogen concentration sensor cannot be influenced by the generation of water drops.
3. Good heat transfer properties according to the metal: the heat conducting wires are added, the heat of the PTC heater is rapidly conducted to the heat conducting wires, the surfaces of the heat conducting wires are fully contacted with the mixed gas, and the mixed gas is heated to a constant temperature.
4. The price is cheap: the detection device body is formed by welding steel pipes, and is low in material cost and convenient to process.
5. Nimble cooperation, simple to operate: the inlet and the outlet of the device are provided with pier heads, so that the device is convenient to be matched and installed with a silicone tube.
Drawings
Fig. 1 is a schematic structural view of a tail-gas exhaust hydrogen concentration detection apparatus according to an embodiment of the present invention;
fig. 2 is a sectional view of a tail gas exhaust hydrogen concentration detection apparatus according to an embodiment of the present invention;
FIG. 3 is a schematic structural diagram of a sample elbow in the tail-gas-discharge hydrogen concentration detection apparatus according to the embodiment of the present invention;
wherein: 1. the device comprises a tail discharge pipe, 2a sampling bent pipe, 3 a PTC heater, 4 a hydrogen concentration sensor, 21 a bent pipe, 22 a bevel steel pipe, 23 a welded tee joint, 24 a sensor joint, 25 and a heat conducting wire.
Detailed Description
The invention is described in detail below with reference to the figures and specific embodiments. The present embodiment is implemented on the premise of the technical solution of the present invention, and a detailed implementation manner and a specific operation process are given, but the scope of the present invention is not limited to the following embodiments.
A tail exhaust hydrogen concentration detection device of a fuel cell system is shown in figure 1 and comprises a tail exhaust pipe 1, a sampling bent pipe 2, a PTC heater 3 and a hydrogen concentration sensor 4,
as shown in fig. 2 and fig. 3, the sampling bent tube 2 includes a bent tube 21, a welded tee 23, a steel tube 22 with a bevel opening and a sensor joint 24, a first end of the welded tee 23 is connected with an output end of the bent tube 21, a second end is connected with an input end of the steel tube 22 with a bevel opening, a third end is connected with the sensor joint 24, the hydrogen concentration sensor 4 is installed on the sensor joint 24, an input end of the bent tube 21 is inserted into the tail pipe 1 and welded with a tube wall of the tail pipe 1, an output end of the steel tube 22 with a bevel opening is inserted into the tail pipe 1 and welded with the tube wall of the tail pipe 1, a heat conducting wire 25 is arranged in the bent tube 21, and the heat conducting wire 25 is connected with the PTC heater 3 in a heat conduction mode. The heat conductive wires 25 are in a mesh shape.
Physical properties according to gas humidity and temperature: the PTC heats the mixed gas to lower the humidity of the mixed gas, and the detection of the hydrogen concentration sensor 4 is not affected by the generation of water droplets.
Wherein, PTC heater 3 wraps up in the outside of bending pipe 21, and heat conduction silk 25 is connected through bending pipe 21 and PTC heater 3 heat-conduction, has avoided the problem that the gas tightness that the fifty percent discount return bend 21 opening leads to reduces the preparation degree of difficulty. In some embodiments, the heat conducting wires 25 are supported on the inner wall of the bending tube 21, so as to improve the structural strength.
In some embodiments, the slope of the output end of the mule-neck steel pipe 22 is disposed toward the outlet side of the tail pipe 1, improving the discharge efficiency. The bevel angle of the output end of the bevel steel pipe 22 is 30-60 degrees.
In some embodiments, the trailing rack tube 1 is a stainless steel tube and the sampling bend 2 is a metal tube, improving strength and thermal conductivity.
The bending pipe 21 comprises an inlet section, a steering section and a straight pipe section which are sequentially connected, the inlet section and the straight pipe section are parallel to the direction of the tail discharge pipe 1, and the straight pipe section is wrapped by the PTC heater 3.
The design is carried out by utilizing the relation between the humidity and the temperature of the gas, when the moisture in the gas is constant, the humidity can be obviously reduced along with the increase of the temperature; as the temperature decreases, the humidity rises significantly until saturation, and as the temperature further decreases, the gas saturates and liquid water is evolved.
The section view of the fuel cell and the whole tail exhaust hydrogen concentration detection device is shown in figure 2.
The mixed gas is discharged from the system and the whole vehicle, the temperature of the mixed gas is high, the mixed gas carries liquid water, and the humidity of the mixed gas is high at the moment. Because the tail exhaust pipeline is longer, the heat of the mixed gas in the tail exhaust pipeline is lost, and the temperature of the mixed gas is reduced. In other words, the humidity of the mixed gas can reach 100% when the mixed gas does not pass through the tail gas exhaust hydrogen concentration device.
When the mixed gas enters the stainless steel pipe, a small amount of the mixed gas enters the sampling elbow 2, the temperature of the sampling elbow 2 is heated to a preset temperature by the PTC heater 3, and the humidity of the mixed gas is obviously reduced after the mixed gas is fully heated by the heat conducting wires 25. In other words, when the moisture content in the gas is constant, the humidity of the mixed gas is significantly reduced as the temperature is increased.
The heat of the heat conducting wire 25 is conducted from the PTC heater 3, and the heat conducting wire 25 is used to sufficiently contact the mixed gas to ensure that the mixed gas is heated to a constant temperature.
The heated mixed gas passes through the hydrogen concentration sensor 4, no or only trace liquid water is generated on the surface of the hydrogen concentration sensor, and the detection of the hydrogen concentration sensor on the hydrogen content in the mixed gas is not influenced.
Finally, the heated mixed gas is converged into the stainless steel pipe through the bevel steel pipe 22 and discharged into the atmosphere.
Claims (10)
1. A tail exhaust hydrogen concentration detection device of a fuel cell system is characterized by comprising a tail exhaust pipe (1), a sampling bent pipe (2), a PTC heater (3) and a hydrogen concentration sensor (4),
sample return bend (2) are including bending pipe (21), welding tee bend (23), bevel connection steel pipe (22) and sensor joint (24), the first end of welding tee bend (23) is connected with the output of bending pipe (21), and the second end is connected with the input of bevel connection steel pipe (22), and the third end is connected with sensor joint (24), hydrogen concentration sensor (4) install in on sensor joint (24), the input of bending pipe (21) insert to the tail calandria (1) in and with the pipe wall welding of tail calandria (1), the output of bevel connection steel pipe (22) insert to the tail calandria (1) in and with the pipe wall welding of tail calandria (1), be equipped with heat-conducting wire (25) in bending pipe (21), this heat-conducting wire (25) and PTC heater (3) heat-conduction are connected.
2. The tail-gas hydrogen concentration detection device of the fuel cell system according to claim 1, wherein the PTC heater (3) is wrapped outside the bending pipe (21), and the heat conduction wire (25) is connected with the PTC heater (3) in a heat conduction manner through the bending pipe (21).
3. The device for detecting the concentration of exhaust hydrogen of a fuel cell system according to claim 2, wherein the heat conduction wire (25) is supported on an inner wall of the bent pipe (21).
4. The device for detecting the concentration of hydrogen in exhaust tail gas of a fuel cell system according to claim 1, wherein the slope of the output end of the steel pipe (22) is set toward the outlet side of the exhaust tail gas pipe (1).
5. The device for detecting the concentration of hydrogen discharged from the tail of a fuel cell system according to claim 1, wherein the tail pipe (1) is a stainless steel pipe.
6. The tail gas exhaust hydrogen concentration detection device of a fuel cell system according to claim 1, wherein the angle of the slope of the output end of the steel tube (22) is 30 to 60 degrees.
7. The device for detecting the concentration of hydrogen discharged from the tail of the fuel cell system according to claim 1, wherein the bent pipe (21) comprises an inlet section, a turning section and a straight pipe section which are connected in sequence, and the inlet section and the straight pipe section are parallel to the direction of the tail pipe (1).
8. The tail gas exhaust hydrogen concentration detection device of a fuel cell system according to claim 7, wherein the PTC heater (3) is wrapped around the straight tube section.
9. The tail gas exhaust hydrogen concentration detection device of a fuel cell system according to claim 1, wherein the sampling elbow (2) is a metal pipe.
10. The device for detecting the concentration of exhaust hydrogen gas of a fuel cell system according to claim 1, wherein the heat-conducting wires (25) are formed in a mesh shape.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111138295.5A CN113687035A (en) | 2021-09-27 | 2021-09-27 | Tail-exhaust hydrogen concentration detection device of fuel cell system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111138295.5A CN113687035A (en) | 2021-09-27 | 2021-09-27 | Tail-exhaust hydrogen concentration detection device of fuel cell system |
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| Publication Number | Publication Date |
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| CN113687035A true CN113687035A (en) | 2021-11-23 |
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| CN202111138295.5A Pending CN113687035A (en) | 2021-09-27 | 2021-09-27 | Tail-exhaust hydrogen concentration detection device of fuel cell system |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114441106A (en) * | 2022-01-28 | 2022-05-06 | 上海重塑能源科技有限公司 | Hydrogen concentration sensor with heating function and fuel cell system |
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2021
- 2021-09-27 CN CN202111138295.5A patent/CN113687035A/en active Pending
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114441106A (en) * | 2022-01-28 | 2022-05-06 | 上海重塑能源科技有限公司 | Hydrogen concentration sensor with heating function and fuel cell system |
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