CN110821716A - Vehicle and natural gas supply system thereof - Google Patents
Vehicle and natural gas supply system thereof Download PDFInfo
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- CN110821716A CN110821716A CN201810888027.7A CN201810888027A CN110821716A CN 110821716 A CN110821716 A CN 110821716A CN 201810888027 A CN201810888027 A CN 201810888027A CN 110821716 A CN110821716 A CN 110821716A
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- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical compound C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 title claims abstract description 280
- 239000003345 natural gas Substances 0.000 title claims abstract description 140
- 239000007789 gas Substances 0.000 claims abstract description 144
- 239000007788 liquid Substances 0.000 claims abstract description 71
- 239000007791 liquid phase Substances 0.000 claims abstract description 55
- 239000006200 vaporizer Substances 0.000 claims abstract description 43
- 230000008016 vaporization Effects 0.000 claims abstract description 40
- 239000003949 liquefied natural gas Substances 0.000 claims abstract description 26
- 239000012071 phase Substances 0.000 claims description 40
- 238000009834 vaporization Methods 0.000 claims description 30
- 230000001105 regulatory effect Effects 0.000 claims description 18
- 230000005540 biological transmission Effects 0.000 claims description 2
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 9
- 230000000087 stabilizing effect Effects 0.000 description 5
- 238000010521 absorption reaction Methods 0.000 description 4
- 238000009434 installation Methods 0.000 description 3
- 238000000034 method Methods 0.000 description 3
- 239000000446 fuel Substances 0.000 description 2
- 239000010410 layer Substances 0.000 description 2
- 238000012423 maintenance Methods 0.000 description 2
- 230000008092 positive effect Effects 0.000 description 2
- 238000005086 pumping Methods 0.000 description 2
- 229910052799 carbon Inorganic materials 0.000 description 1
- 238000004891 communication Methods 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 238000001816 cooling Methods 0.000 description 1
- 230000001419 dependent effect Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000001704 evaporation Methods 0.000 description 1
- 230000008020 evaporation Effects 0.000 description 1
- 238000001914 filtration Methods 0.000 description 1
- 239000011229 interlayer Substances 0.000 description 1
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Classifications
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
- F02M21/00—Apparatus for supplying engines with non-liquid fuels, e.g. gaseous fuels stored in liquid form
- F02M21/02—Apparatus for supplying engines with non-liquid fuels, e.g. gaseous fuels stored in liquid form for gaseous fuels
- F02M21/0218—Details on the gaseous fuel supply system, e.g. tanks, valves, pipes, pumps, rails, injectors or mixers
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
- F02M21/00—Apparatus for supplying engines with non-liquid fuels, e.g. gaseous fuels stored in liquid form
- F02M21/02—Apparatus for supplying engines with non-liquid fuels, e.g. gaseous fuels stored in liquid form for gaseous fuels
- F02M21/0203—Apparatus for supplying engines with non-liquid fuels, e.g. gaseous fuels stored in liquid form for gaseous fuels characterised by the type of gaseous fuel
- F02M21/0215—Mixtures of gaseous fuels; Natural gas; Biogas; Mine gas; Landfill gas
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
- F02M21/00—Apparatus for supplying engines with non-liquid fuels, e.g. gaseous fuels stored in liquid form
- F02M21/02—Apparatus for supplying engines with non-liquid fuels, e.g. gaseous fuels stored in liquid form for gaseous fuels
- F02M21/0218—Details on the gaseous fuel supply system, e.g. tanks, valves, pipes, pumps, rails, injectors or mixers
- F02M21/0221—Fuel storage reservoirs, e.g. cryogenic tanks
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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
- Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
- Y02T10/00—Road transport of goods or passengers
- Y02T10/10—Internal combustion engine [ICE] based vehicles
- Y02T10/30—Use of alternative fuels, e.g. biofuels
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- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- General Chemical & Material Sciences (AREA)
- Oil, Petroleum & Natural Gas (AREA)
- Combustion & Propulsion (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Filling Or Discharging Of Gas Storage Vessels (AREA)
Abstract
The invention provides a vehicle and a natural gas supply system thereof. The natural gas supply system is used for supplying natural gas to an engine of a vehicle and comprises a gas cylinder, a cryogenic transfer pump, a vaporizer and a buffer tank. The gas cylinder is used for storing liquefied natural gas and is provided with a liquid phase output port; the low-temperature delivery pump is connected with the liquid-phase output port through a liquid-phase delivery pipeline and outputs the liquefied natural gas in the gas cylinder outwards; the low-temperature delivery pump is provided with a liquid inlet port, a liquid outlet port and a gas outlet port, and the liquid inlet port is connected with the liquid phase delivery pipeline; the vaporizer is used for vaporizing the liquefied natural gas into normal-temperature natural gas; the vaporizer is provided with an air inlet, a liquid inlet and an air supply outlet, the air inlet is connected with an air outlet port of the low-temperature delivery pump, and the liquid inlet is connected with a liquid outlet port of the liquid pump; the inlet end of the buffer tank is connected with the air supply outlet of the vaporizer, and the outlet end of the buffer tank is used for outputting normal-temperature natural gas to the engine.
Description
Technical Field
The invention relates to the field of liquefied natural gas vehicles, in particular to a vehicle and a natural gas supply system thereof.
Background
Natural gas has wide applications as a high-quality, clean, low-carbon energy source, and natural gas is actively popularized and used in various regions as a fuel for vehicles.
The vehicle using natural gas as fuel needs a set of natural gas supply system to supply gas smoothly, and the prior natural gas supply system, one kind, relies on a self-pressurization system to pressurize a gas cylinder, and presses out liquefied natural gas to be vaporized for the vehicle to use. The self-pressurization system comprises an air temperature type vaporizer, a pressurization regulating valve, a pressurization stop valve, an inner pipe and an outer pipe of the gas cylinder and the like, and gas for vehicles is extremely dependent on unstable gas cylinder pressure, so that the gas supply system has many faults; the liquid pumping pump assembly is fixedly installed through a mounting seat welded on the gas cylinder, and the liquid pumping pump is partially arranged inside the gas cylinder and partially arranged outside the gas cylinder. The natural gas supply system has the advantages that the structure of the installation seat is complex, the liquid pump assembly part positioned in the gas cylinder cannot be overhauled, the internal and external structures and the pipeline system of the gas cylinder must be destroyed if the natural gas supply system is overhauled, and the interlayer is vacuumized again, so that the natural gas supply system consumes time and labor and is huge in cost.
Disclosure of Invention
The invention aims to provide a vehicle and a natural gas supply system thereof, which aim to solve the problems in the prior art.
In order to solve the above technical problem, the present invention provides a natural gas supply system for supplying natural gas to an engine of a vehicle, comprising: the gas cylinder is used for storing liquefied natural gas and is provided with a liquid phase output port; the low-temperature delivery pump is connected with the liquid-phase output port through a liquid-phase delivery pipeline and outputs the liquefied natural gas in the gas cylinder outwards; the low-temperature delivery pump is provided with a liquid inlet port, a liquid outlet port and a gas outlet port, and the liquid inlet port is connected with the liquid-phase delivery pipeline; a vaporizer for vaporizing the liquefied natural gas into normal temperature natural gas; the vaporizer is provided with an air inlet, a liquid inlet and an air supply outlet, the air inlet is connected with an air outlet port of the low-temperature delivery pump, and the liquid inlet is connected with a liquid outlet port of the liquid pump; and the inlet end of the buffer tank is connected with the air supply outlet, and the outlet end of the buffer tank is used for outputting the normal-temperature natural gas to the engine.
Preferably, the length of the liquid phase transport conduit is no greater than 500 mm.
Preferably, the gas cylinder is also provided with a gas phase output port, and the gas phase output port is connected with the gas inlet of the vaporizer through a gas phase conveying pipeline.
Preferably, a pressure reduction regulating valve is arranged on the gas phase conveying pipeline and used for communicating or cutting off the gas phase conveying pipeline.
Preferably, the set pressure range of the pressure reducing regulating valve is 0-0.3 Mpa.
Preferably, three mutually independent vaporization channels, namely a first vaporization channel, a second vaporization channel and a third vaporization channel, are arranged in the vaporizer; the gas supply outlet comprises three normal-temperature natural gas outlets which are respectively a first normal-temperature natural gas outlet, a second normal-temperature natural gas outlet and a third normal-temperature natural gas outlet; a gas phase output port of the gas cylinder is connected with the first normal temperature natural gas outlet through the first vaporization channel; an air outlet port of the low-temperature delivery pump is connected with the second normal-temperature natural gas outlet through the second vaporization channel; and the liquid outlet port of the low-temperature delivery pump is connected with the third normal-temperature natural gas outlet through the third vaporization channel.
Preferably, each normal-temperature natural gas outlet is connected with the buffer tank through three mutually independent gas transmission pipelines.
Preferably, the cryogenic transfer pump is driven to work by a driving part, and the driving part is electrically connected with the vehicle power supply.
Preferably, a pipeline between the liquid outlet port of the low-temperature delivery pump and the liquid inlet of the vaporizer is provided with an overflow valve.
The invention also provides a vehicle comprising a natural gas supply system as described above.
According to the technical scheme, the invention has the advantages and positive effects that: according to the natural gas supply system, the low-temperature delivery pump is arranged on the pipeline, the liquefied natural gas in the gas cylinder is output outwards through the low-temperature delivery pump, and gas supply is carried out without depending on the pressure of the gas cylinder, so that a pressurization pipeline system is not required, the natural gas supply system is more stable in gas supply, the number of required valves is less, and the pipeline is simplified. And the low-temperature delivery pump is arranged outside the gas cylinder, so that the installation is simple, the overhaul and the replacement are convenient, and the applicability is stronger.
Drawings
FIG. 1 is a schematic diagram of a preferred embodiment of the natural gas supply system of the present invention;
FIG. 2 is a front view of a preferred embodiment of the gas cylinder of the present invention;
FIG. 3 is a left side view of a preferred embodiment of the gas cylinder of the present invention;
FIG. 4 is a front view of a preferred embodiment of the vaporizer of the present invention;
FIG. 5 is a left side view of a preferred embodiment of the vaporizer of the present invention;
FIG. 6 is a right side view of a preferred embodiment of the vaporizer of the present invention;
FIG. 7 is a front view of a preferred embodiment of a buffer of the present invention;
FIG. 8 is a left side view of a preferred embodiment of a bumper of the present invention;
FIG. 9 is a right side view of a preferred embodiment of a buffer of the present invention;
fig. 10 is a gas supply flow of the preferred embodiment of the natural gas supply system of the present invention.
Wherein the reference numerals are as follows: 1. a natural gas supply system; 11. a gas cylinder; 111. a liquid phase output port; 1111. a liquid phase delivery conduit; 1112. a liquid phase outlet valve; 1113. a liquid outlet one-way valve; 112. a gas phase output port; 1121. a gas phase delivery conduit; 1122. a pressure reducing regulating valve; 113. a liquid filling port; 1131. a liquid charging pipeline; 1132. a liquid inlet check valve; 114. a main safety valve; 115. a secondary safety valve; 116. an atmospheric valve; 117. a pressure gauge; 118. a liquid level meter; 12. a cryogenic transfer pump; 121. a liquid inlet port; 122. a liquid outlet port; 123. an air outlet port; 124. a drive member; 125. an overflow valve; 13. a vaporizer; 131. a first air inlet; 132. a second air inlet; 133. a liquid inlet; 134. a first normal-temperature natural gas outlet; 135. a second normal-temperature natural gas outlet; 136. a third normal-temperature natural gas outlet; 137. a water inlet interface; 138. a water outlet interface; 14. a buffer tank; 141. a first normal temperature natural gas inlet end; 142. a second normal temperature natural gas inlet end; 143. a third normal temperature natural gas inlet end; 144. an air supply outlet end; 15. a pressure maintaining valve; 16. a filter; 17. an electromagnetic valve.
Detailed Description
Exemplary embodiments that embody features and advantages of the invention are described in detail below in the specification. It is to be understood that the invention is capable of other embodiments and that various changes in form and details may be made therein without departing from the scope of the invention and the description and drawings are to be regarded as illustrative in nature and not as restrictive.
For further explanation of the principles and construction of the present invention, reference will now be made in detail to the preferred embodiments of the present invention, which are illustrated in the accompanying drawings.
The invention provides a vehicle comprising an engine for driving the vehicle and a natural gas supply system 1, the natural gas supply system 1 supplying gas to the engine of the vehicle to enable the vehicle to operate.
Referring to fig. 1, the present invention provides a natural gas supply system 1 including a gas cylinder 11, a cryogenic transfer pump 12, a vaporizer 13, and a buffer tank 14. The gas cylinder 11 is used for storing liquefied natural gas, the low-temperature delivery pump 12 is used for delivering the liquefied natural gas in the gas cylinder 11 to the vaporizer 13, the vaporizer 13 vaporizes the liquefied natural gas into normal-temperature natural gas and delivers the normal-temperature natural gas to the buffer tank 14 for storage, so that the natural gas supply system 1 is formed, and natural gas is continuously provided for vehicles.
The following is a detailed description.
The natural gas supply system 1 adopts liquefied natural gas as a gas source, the liquefied natural gas is in a state of coexistence of liquid-phase natural gas and gas-phase natural gas through thermal absorption and evaporation in the gas cylinder 11, and the liquid-phase natural gas and the gas-phase natural gas are respectively output outwards through respective conveying pipelines. Referring to fig. 2 and 3, the gas cylinder 11 has a liquid phase output port 111, a gas phase output port 112, and a liquid charging port 113. The gas cylinder 11 contains a gas phase space and a liquid phase space, the liquid phase natural gas is located in the liquid phase space, and the gas phase natural gas is located in the gas phase space.
The liquid phase output port 111 is used for outputting liquid phase natural gas outwards. Specifically, the liquid phase output port 111 is connected to the cryogenic transfer pump 12 through the liquid phase transfer pipe 1111. Preferably, a liquid phase outlet valve 1112 is arranged on the liquid phase conveying pipeline 1111 to control the connection or disconnection of the liquid phase conveying pipeline 1111. In this embodiment, the liquid phase outlet valve 1112 is a low temperature stop valve.
Preferably, the liquid delivery pipe 1111 is provided with a liquid outlet check valve 1113, and the liquid outlet check valve 1113 is arranged at the front end of the liquid outlet valve 1112, so that only the liquid-phase natural gas is allowed to be output from the gas cylinder 11 and not allowed to be input into the gas cylinder 11.
The gas phase output port 112 is used for outputting gas phase natural gas to the outside. Specifically, the gas phase output port 112 is connected to the vaporizer 13 through a gas phase delivery pipe 1121. Preferably, the gas phase transport pipe 1121 is provided with a pressure reduction regulating valve 1122. The set pressure range of the pressure reducing regulating valve 1122 is 0-0.3 Mpa, and the liquid phase natural gas in the gas cylinder 11 is output outwards through the low-temperature delivery pump 12 and is not influenced by the pressure in the gas cylinder 11, so that the set pressure of the pressure reducing regulating valve 1122 can be greatly reduced compared with the 0.8Mpa in the prior art. When the gas pressure in the gas cylinder 11 reaches the set pressure of the pressure reducing regulating valve 1122, the pressure reducing regulating valve 1122 is opened, and the gas-phase natural gas in the gas cylinder 11 is delivered to the vaporizer 13 through the pressure reducing regulating valve 1122, so as to be supplied to a vehicle for use, thereby maintaining the low pressure state of the pressure in the gas cylinder 11 at 0-0.3 Mpa. After the vehicle is stopped, the pressure in the gas cylinder 11 rises to exceed the set pressure of the pressure reducing regulating valve 1122, after the vehicle is opened, the pressure reducing regulating valve 1122 is opened first, the gas-phase natural gas in the gas cylinder 11 is output outwards through the gas-phase conveying pipeline 1121 for the vehicle to use, and meanwhile, the pressure in the gas cylinder 11 is reduced, so that the discharge frequency of the safety valve of the gas cylinder 11 is low, the leakage probability of the natural gas supply system 1 is low, the safety is improved, and the energy is saved.
The liquid filling port 113 is used for filling liquefied natural gas into the gas cylinder 11, and because the gas cylinder 11 is always in a low-pressure state and sufficient pressure difference exists between a gas filling gun of the gas filling station and the gas cylinder 11, gas leakage and pressure relief operations are not required during liquid filling, so that the liquid filling operation is simpler and more convenient, a gas return gun and a gas return pipeline are not required to be arranged in the gas filling station, and a gas return valve is not required to be arranged in the gas cylinder 11, so that the structures of the gas filling station equipment and the gas cylinder 11 are simplified.
Specifically, a liquid filling pipeline 1131 is disposed at the liquid filling port 113, and the liquid filling pipeline 1131 is a hose. Preferably, a liquid inlet check valve 1132 is arranged on the liquid filling pipeline 1131, and the liquid inlet check valve 1132 only allows the liquefied natural gas to enter the gas cylinder 11, but does not allow the liquefied natural gas to be output to the outside of the gas cylinder 11.
The liquid filling pipe 1131 and the liquid inlet check valve 1132 may be installed at a suitable position inside the vehicle, or may be installed to the gas cylinder 11.
The gas cylinder 11 further includes a main relief valve 114, a sub-relief valve 115, a vent valve 116, a pressure gauge 117, and a liquid level gauge 118 provided in the gas cylinder 11.
The main safety valve 114 and the auxiliary safety valve 115 are used for automatically exhausting and releasing pressure for the main safety valve 114 or the auxiliary safety valve 115 when the pressure of the gas cylinder 11 rises to reach the set pressure of the main safety valve 114 or the auxiliary safety valve 115 due to long-time parking of a vehicle or failure in the use process of the gas cylinder 11, so that the gas cylinder 11 is ensured to be safely used.
The emptying valve 116 is used for manual pressure relief when the gas cylinder 11 is overhauled, and non-pressure overhauling is guaranteed. Connect first pipe of diffusing behind atmospheric valve 116, connect the second pipe of diffusing behind the main safety valve 114, link to each other with the discharge port again after first pipe of diffusing and the second manifold of diffusing, the discharge port sets up in the open position in vehicle top so that the quick loss of liquefied natural gas avoids the potential danger that gas gathers.
The gas cylinder 11 can be mounted on the vehicle floor in the form of a pedestal-plus-pull belt, or can be mounted in other forms at other positions of the vehicle, and can be selected according to the type of the vehicle and other factors.
Referring to fig. 1 again, the cryogenic transfer pump 12 is connected to the liquid phase output port 111 of the gas cylinder 11 through the liquid phase transfer pipe 1111, and outputs the liquid phase natural gas in the gas cylinder 11 to the outside. The cryogenic transfer pump 12 has an inlet port 121, an outlet port 122 and an outlet port 123, the inlet port 121 being connected to the liquid phase transfer pipe 1111.
Preferably, the length of the liquid-phase conveying pipeline 1111 is not greater than 500mm, so as to control the distance between the cryogenic conveying pump 12 and the liquid-phase output port 111 of the gas cylinder 11, and reduce the heat absorption of the liquid-phase natural gas in the conveying process of the liquid-phase conveying pipeline 1111, thereby reducing the gas-phase natural gas generated by vaporization. Further, the outer layer of the low-temperature delivery pump 12 is provided with an insulating layer, so that the low temperature can be kept in the process of delivering the liquid-phase natural gas, and the vaporization of the liquid-phase natural gas due to heat absorption is reduced.
Further, a liquid inlet check valve is arranged at the liquid inlet port 121 of the cryogenic transfer pump 12, and is arranged in the cryogenic transfer pump 12. The liquid inlet one-way valve only allows the liquid-phase natural gas to be input from the gas cylinder 11 to the cryogenic transfer pump 12, but does not allow the liquid-phase natural gas to be output from the cryogenic transfer pump 12 to the gas cylinder 11.
The liquid outlet port 122 is used for transporting the liquefied natural gas to the outside. In this embodiment, the liquid outlet port 122 is provided with a liquid outlet check valve and is disposed in the cryogenic transfer pump 12. The liquid outlet one-way valve only allows the liquid-phase natural gas to be output to the vaporizer 13 from the cryogenic transfer pump 12, but not allows the liquid-phase natural gas to be input to the cryogenic transfer pump 12 from the vaporizer 13, so that the liquid-phase natural gas is ensured not to flow reversely.
Further, an excess flow valve 125 is provided on a pipeline between the liquid outlet port 122 of the cryogenic transfer pump 12 and the vaporizer 13, and when the pipeline is broken and leaks behind the excess flow valve 125, the excess flow valve 125 is automatically closed to prevent the leakage.
The gas outlet port 123 is used to deliver gas phase natural gas to the vaporizer 13. Because the cryogenic transfer pump 12 generates heat during operation and further vaporizes a portion of the liquefied natural gas to generate gas-phase natural gas, the gas in the cryogenic transfer pump 12 is discharged through the gas outlet port 123 in time, and thus the cryogenic transfer pump 12 is ensured to work continuously. Preferably, the gas outlet port 123 is provided with a gas outlet check valve, which only allows the gas-phase natural gas to be output from the cryogenic transfer pump 12 to the vaporizer 13, but does not allow the gas-phase natural gas to be input from the vaporizer 13 to the cryogenic transfer pump 12, so as to ensure that the gas-phase natural gas does not flow reversely.
The cryogenic transfer pump 12 is driven by the driving part 124 to work, the driving part 124 is electrically connected with a vehicle power supply, when the vehicle is started, the power supply is turned on, the driving part 124 drives the cryogenic transfer pump 12 to work, and then liquefied natural gas is pumped out to ensure that the natural gas supply system 1 can continuously provide natural gas for the vehicle to use.
The flow rate of the cryogenic transfer pump 12 may be selected based on the magnitude of the vehicle's power. The pipelines between the liquid inlet port 121, the liquid outlet port 122 and the gas outlet port 123 of the low-temperature delivery pump 12 and the corresponding interfaces adopt clamping sleeves or other detachable connection modes, so that the maintenance is convenient, and the maintenance is specifically determined according to actual conditions.
Referring to fig. 4 to 6, the vaporizer 13 includes a first air inlet 131, a second air inlet 132, a liquid inlet 133, a first normal-temperature natural gas outlet 134, a second normal-temperature natural gas outlet 135, and a third normal-temperature natural gas outlet 136. The gas phase output port 112 of the gas cylinder 11 is connected with the first gas inlet 131 through the gas phase delivery pipe 1121 and through the outlet of the pressure reduction regulating valve 1122, the gas outlet port 123 of the low temperature delivery pump 12 is connected with the second gas inlet 132, and the liquid outlet port 122 of the low temperature delivery pump 12 is connected with the liquid inlet 133 of the vaporizer 13. The first gas inlet 131 is connected to the first normal-temperature natural gas outlet 134 through a first vaporization channel, the second gas inlet 132 is connected to the second normal-temperature natural gas outlet 135 through a second vaporization channel, and the liquid inlet 133 is connected to the third normal-temperature natural gas outlet 136 through a third vaporization channel. The first vaporization channel, the second vaporization channel and the third vaporization channel are independent from each other, so that pressure shielding cannot be generated among the first vaporization channel, the second vaporization channel and the third vaporization channel, and the situation that when multiple vaporization channels are collected into one channel, the low-pressure channel is blocked by the high-pressure channel when the pressures of the vaporization channels are different, the medium preferentially flows into the high-pressure channel, and the low-pressure channel is closed, so that the medium in the low-pressure channel cannot flow through.
In this embodiment, the vaporizer 13 is a water bath vaporizer, and the first vaporizing path, the second vaporizing path and the third vaporizing path are in the form of pipes and are coiled in the vaporizer 13 and fixed in the vaporizer 13 by fixing members. The lengths of the first vaporization passage, the second vaporization passage and the third vaporization passage are set according to the vaporization amount required by the liquid-phase natural gas and the gas-phase natural gas, and the specific lengths are determined according to the air supply amount of vehicles of different vehicle types. Generally, the vaporization passage of the liquid phase natural gas, i.e., the third vaporization passage, is longest.
Specifically, in the present embodiment, the vaporizer 13 includes a cylinder, and a water inlet port 137 and a water outlet port 138 respectively arranged at two ends of the cylinder. Preferably, the water inlet interface 137 and the water outlet interface 138 are connected with the inlet and outlet of the cooling circulating water of the vehicle engine, so that the water is recycled, and the energy is saved.
The first normal temperature natural gas outlet 134, the second normal temperature natural gas outlet 135 and the third normal temperature natural gas outlet 136 are conveyed to the buffer tank 14 through three mutually independent gas pipelines. Referring to fig. 7-9, the buffer tank 14 includes a first normal temperature natural gas inlet 141, a second normal temperature natural gas inlet 142, a third normal temperature natural gas inlet 143, and an air supply outlet 144. The first normal temperature natural gas inlet 141, the second normal temperature natural gas inlet 142, and the third normal temperature natural gas inlet 143 are respectively connected to the first normal temperature natural gas outlet 134, the second normal temperature natural gas outlet 135, and the third normal temperature natural gas outlet 136 on the vaporizer 13, and the gas supply outlet 144 is connected to the engine to supply the normal temperature natural gas to the engine.
The normal temperature natural gas vaporized by the vaporizer 13 is divided into three paths of gas which enter the buffer tank 14, and the three paths of gas are independent from each other and do not generate pressure shielding, so that the normal work of each pipeline of the natural gas supply system 1 is ensured.
Specifically, the buffer tank 14 includes a cylinder, and a left end enclosure and a right end enclosure disposed at two ends of the cylinder. The first normal temperature natural gas inlet 141, the second normal temperature natural gas inlet 142, and the third normal temperature natural gas inlet 143 are disposed on the left end cap, and the air supply outlet 144 is disposed on the right end cap. The cylinder body and the vehicle are fixedly installed through a support.
A surge tank 15, a filter 16 and an electromagnetic valve 17 are also provided between the buffer tank 14 and the engine. Preferably, the pressure stabilizing valve 15 is a rear-end pressure regulating valve, that is, when the pressure of a pipeline at the rear end of the pressure stabilizing valve 15 is lower than the set pressure of the pressure stabilizing valve 15, the pressure stabilizing valve 15 is opened, and the gas in the buffer tank 14 continuously passes through the pressure stabilizing valve 15 for the gas supply of the engine.
The filter 16 is used for filtering the normal temperature natural gas delivered to the engine from the buffer tank 14. The solenoid valve 17 is used to control the communication or cut-off of the line between the surge tank 14 and the engine.
Referring to fig. 10, the gas flow of the natural gas supply system 1 of the present invention is as follows:
firstly, a liquid phase outlet valve 1112 at a liquid phase output port 111 on the gas cylinder 11 is opened, the vehicle is started, namely, a power supply is started, and a driving part 124 drives the low-temperature delivery pump 12 to carry out delivery work; when the cryogenic transfer pump 12 works, the liquid-phase natural gas in the gas cylinder 11 is transferred into the cryogenic transfer pump 12 through the liquid inlet port 121 on the cryogenic transfer pump 12, and then the liquid-phase natural gas in the cryogenic transfer pump 12 is transferred to the vaporizer 13 through the liquid outlet port 122 on the cryogenic transfer pump 12; meanwhile, after the vehicle is stopped, the pressure in the gas cylinder 11 rises to exceed the set pressure of the pressure reducing regulating valve 1122, and after the vehicle is started, the pressure reducing regulating valve 1122 is opened, so that the gas-phase natural gas in the gas cylinder 11 enters the vaporizer 13 through the gas-phase conveying pipeline 1121; after the cryogenic transfer pump 12 operates for a period of time, part of the liquid-phase natural gas in the cryogenic transfer pump 12 is vaporized into gas-phase natural gas due to the absorption of heat in the environment, and the gas-phase natural gas is transferred to the vaporizer 13 through the gas outlet port 123; the vaporizer 13 vaporizes the liquefied natural gas into normal-temperature natural gas through three mutually independent vaporization channels, and then the normal-temperature natural gas is conveyed to the buffer tank 14 through three mutually independent gas pipelines, and the normal-temperature natural gas is stored in the buffer tank 14 and is used by an engine.
According to the technical scheme, the invention has the advantages and positive effects that: according to the natural gas supply system, the low-temperature delivery pump is arranged on the pipeline, the liquefied natural gas in the gas cylinder is output outwards through the low-temperature delivery pump, and gas supply is carried out without depending on the pressure of the gas cylinder, so that a pressurization pipeline system is not required, the natural gas supply system is more stable in gas supply, the number of required valves is less, and the pipeline is simplified. And the low-temperature delivery pump is arranged outside the gas cylinder, so that the installation is simple, the overhaul and the replacement are convenient, and the applicability is stronger.
The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the scope of the present invention, but rather is intended to cover all equivalent structural changes made by the use of the specification and drawings.
Claims (10)
1. A natural gas supply system for providing natural gas to an engine of a vehicle, comprising:
the gas cylinder is used for storing liquefied natural gas and is provided with a liquid phase output port;
the low-temperature delivery pump is connected with the liquid-phase output port through a liquid-phase delivery pipeline and outputs the liquefied natural gas in the gas cylinder outwards; the low-temperature delivery pump is provided with a liquid inlet port, a liquid outlet port and a gas outlet port, and the liquid inlet port is connected with the liquid-phase delivery pipeline;
a vaporizer for vaporizing the liquefied natural gas into normal temperature natural gas; the vaporizer is provided with an air inlet, a liquid inlet and an air supply outlet, the air inlet is connected with an air outlet port of the low-temperature delivery pump, and the liquid inlet is connected with a liquid outlet port of the liquid pump;
and the inlet end of the buffer tank is connected with the air supply outlet, and the outlet end of the buffer tank is used for outputting the normal-temperature natural gas to the engine.
2. The natural gas supply system of claim 1, wherein the liquid phase transport conduit is no greater than 500mm in length.
3. The natural gas supply system of claim 1, wherein the gas cylinder further has a gas phase outlet connected to the gas inlet of the vaporizer by a gas phase delivery conduit.
4. The natural gas supply system according to claim 3, wherein a pressure reduction regulating valve is arranged on the gas phase conveying pipeline and used for communicating or cutting off the gas phase conveying pipeline.
5. The natural gas supply system according to claim 4, wherein the set pressure of the pressure reduction regulating valve is in a range of 0-0.3 MPa.
6. The natural gas supply system according to claim 3, wherein three independent vaporizing passages are provided in the vaporizer, namely a first vaporizing passage, a second vaporizing passage and a third vaporizing passage;
the gas supply outlet comprises three normal-temperature natural gas outlets which are respectively a first normal-temperature natural gas outlet, a second normal-temperature natural gas outlet and a third normal-temperature natural gas outlet;
a gas phase output port of the gas cylinder is connected with the first normal temperature natural gas outlet through the first vaporization channel;
an air outlet port of the low-temperature delivery pump is connected with the second normal-temperature natural gas outlet through the second vaporization channel;
and the liquid outlet port of the low-temperature delivery pump is connected with the third normal-temperature natural gas outlet through the third vaporization channel.
7. The natural gas supply system of claim 6, wherein each normal temperature natural gas outlet is connected to the buffer tank by three mutually independent gas transmission pipelines.
8. The natural gas supply system of claim 1, wherein the cryogenic transfer pump is driven by a drive member, the drive member being electrically connected to the vehicle power source.
9. The natural gas supply system of claim 1, wherein a flow-passing valve is arranged on a pipeline between the liquid outlet port of the cryogenic transfer pump and the liquid inlet of the vaporizer.
10. A vehicle comprising a natural gas supply system as claimed in any one of claims 1 to 9.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201810888027.7A CN110821716A (en) | 2018-08-07 | 2018-08-07 | Vehicle and natural gas supply system thereof |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201810888027.7A CN110821716A (en) | 2018-08-07 | 2018-08-07 | Vehicle and natural gas supply system thereof |
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| CN110821716A true CN110821716A (en) | 2020-02-21 |
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| CN201810888027.7A Pending CN110821716A (en) | 2018-08-07 | 2018-08-07 | Vehicle and natural gas supply system thereof |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN114566026A (en) * | 2022-04-28 | 2022-05-31 | 成都蓉悦科技有限公司 | Automatic data measurement and control device, system and method for gas transmission station |
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