CN118998599B - Gas storage tank exhaust control system and exhaust control method - Google Patents
Gas storage tank exhaust control system and exhaust control method Download PDFInfo
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- CN118998599B CN118998599B CN202411497172.4A CN202411497172A CN118998599B CN 118998599 B CN118998599 B CN 118998599B CN 202411497172 A CN202411497172 A CN 202411497172A CN 118998599 B CN118998599 B CN 118998599B
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F17—STORING OR DISTRIBUTING GASES OR LIQUIDS
- F17C—VESSELS FOR CONTAINING OR STORING COMPRESSED, LIQUEFIED OR SOLIDIFIED GASES; FIXED-CAPACITY GAS-HOLDERS; FILLING VESSELS WITH, OR DISCHARGING FROM VESSELS, COMPRESSED, LIQUEFIED, OR SOLIDIFIED GASES
- F17C7/00—Methods or apparatus for discharging liquefied, solidified, or compressed gases from pressure vessels, not covered by another subclass
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F17—STORING OR DISTRIBUTING GASES OR LIQUIDS
- F17C—VESSELS FOR CONTAINING OR STORING COMPRESSED, LIQUEFIED OR SOLIDIFIED GASES; FIXED-CAPACITY GAS-HOLDERS; FILLING VESSELS WITH, OR DISCHARGING FROM VESSELS, COMPRESSED, LIQUEFIED, OR SOLIDIFIED GASES
- F17C13/00—Details of vessels or of the filling or discharging of vessels
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F17—STORING OR DISTRIBUTING GASES OR LIQUIDS
- F17C—VESSELS FOR CONTAINING OR STORING COMPRESSED, LIQUEFIED OR SOLIDIFIED GASES; FIXED-CAPACITY GAS-HOLDERS; FILLING VESSELS WITH, OR DISCHARGING FROM VESSELS, COMPRESSED, LIQUEFIED, OR SOLIDIFIED GASES
- F17C13/00—Details of vessels or of the filling or discharging of vessels
- F17C13/02—Special adaptations of indicating, measuring, or monitoring equipment
- F17C13/025—Special adaptations of indicating, measuring, or monitoring equipment having the pressure as the parameter
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F17—STORING OR DISTRIBUTING GASES OR LIQUIDS
- F17C—VESSELS FOR CONTAINING OR STORING COMPRESSED, LIQUEFIED OR SOLIDIFIED GASES; FIXED-CAPACITY GAS-HOLDERS; FILLING VESSELS WITH, OR DISCHARGING FROM VESSELS, COMPRESSED, LIQUEFIED, OR SOLIDIFIED GASES
- F17C13/00—Details of vessels or of the filling or discharging of vessels
- F17C13/04—Arrangement or mounting of valves
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F17—STORING OR DISTRIBUTING GASES OR LIQUIDS
- F17D—PIPE-LINE SYSTEMS; PIPE-LINES
- F17D1/00—Pipe-line systems
- F17D1/02—Pipe-line systems for gases or vapours
- F17D1/04—Pipe-line systems for gases or vapours for distribution of gas
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F17—STORING OR DISTRIBUTING GASES OR LIQUIDS
- F17D—PIPE-LINE SYSTEMS; PIPE-LINES
- F17D3/00—Arrangements for supervising or controlling working operations
- F17D3/01—Arrangements for supervising or controlling working operations for controlling, signalling, or supervising the conveyance of a product
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F17—STORING OR DISTRIBUTING GASES OR LIQUIDS
- F17C—VESSELS FOR CONTAINING OR STORING COMPRESSED, LIQUEFIED OR SOLIDIFIED GASES; FIXED-CAPACITY GAS-HOLDERS; FILLING VESSELS WITH, OR DISCHARGING FROM VESSELS, COMPRESSED, LIQUEFIED, OR SOLIDIFIED GASES
- F17C2225/00—Handled fluid after transfer, i.e. state of fluid after transfer from the vessel
- F17C2225/01—Handled fluid after transfer, i.e. state of fluid after transfer from the vessel characterised by the phase
- F17C2225/0107—Single phase
- F17C2225/0123—Single phase gaseous, e.g. CNG, GNC
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F17—STORING OR DISTRIBUTING GASES OR LIQUIDS
- F17C—VESSELS FOR CONTAINING OR STORING COMPRESSED, LIQUEFIED OR SOLIDIFIED GASES; FIXED-CAPACITY GAS-HOLDERS; FILLING VESSELS WITH, OR DISCHARGING FROM VESSELS, COMPRESSED, LIQUEFIED, OR SOLIDIFIED GASES
- F17C2250/00—Accessories; Control means; Indicating, measuring or monitoring of parameters
- F17C2250/04—Indicating or measuring of parameters as input values
- F17C2250/0404—Parameters indicated or measured
- F17C2250/043—Pressure
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Filling Or Discharging Of Gas Storage Vessels (AREA)
Abstract
The invention relates to an air storage tank exhaust control system and an air exhaust control method, wherein the air storage tank exhaust control system comprises at least two air storage tanks, a passive air exhaust device and an active air exhaust device, wherein each air storage tank is provided with two air ports, the passive air exhaust device comprises a venturi tube, the venturi tube is provided with an air exhaust channel and an air suction channel, the air exhaust channel comprises an inlet section, a contraction section and an expansion section, the air suction channel is communicated with the contraction section through a pipeline, a first air port of a first air storage tank is communicated with the air suction channel through a pipeline, a first air port of a second air storage tank is communicated with the inlet section of the air exhaust channel through a pipeline, one end of the active air exhaust device is respectively communicated with the first air storage tank and the second air storage tank, the other end of the active air exhaust device is communicated with the inlet section of the air exhaust channel through a pipeline, and the active air exhaust device can extract air in the first air storage tank and the second air storage tank to be pressurized and exhausted from the passive air exhaust device. According to the invention, all the gases in the gas storage tank can be completely discharged, and the exhaust efficiency and the volume utilization rate are improved.
Description
Technical Field
The invention relates to the technical field of air storage tank exhaust, in particular to an air storage tank exhaust control system and an air storage tank exhaust control method.
Background
In the field of fuel use for vehicles, LNG or natural gas is stored in a gas storage tank, typically, high-pressure gas of about 700bar is stored in the gas storage tank, the working pressure of gas outside the gas storage tank is about 260bar, the gas is released to an engine for combustion to generate energy, the pressure inside the LNG or natural gas storage tank after release is reduced, and when the gas pressure inside the LNG or natural gas storage tank is reduced to 260bar or below, the gas outside the gas storage tank cannot be output to the outside of the gas storage tank for use by the engine due to higher working pressure of the gas outside the gas storage tank, so that the utilization rate of the gas energy inside the gas storage tank is not high, and the storage space of the gas storage tank cannot be effectively utilized.
In the prior art, the gas in the LNG or hydrogen storage tank can not be completely discharged, so that the utilization rate of the gas and the drying tank is affected. In order to discharge all the gas in the gas storage tanks, the gas pump is required to be used for actively pressurizing, and the residual gas is required to be discharged all the time when a plurality of gas storage tanks are arranged, and then, when the gas is discharged through the gas pump for actively pressurizing, the gas pump is required to use more energy to continuously work, so that larger energy consumption is caused.
Disclosure of Invention
Therefore, the technical problem to be solved by the invention is to solve the problem that the gas storage tank cannot exhaust outwards to cause gas residue and cannot be utilized when the gas pressure in the gas storage tank is lower than the working pressure of the gas outside the gas storage tank in the prior art, and provide the gas storage tank exhaust control system and the gas exhaust control method, which can exhaust all the gas in the gas storage tank and improve the exhaust efficiency and the volume utilization rate.
In order to solve the technical problems, the present invention provides an exhaust control system of an air storage tank, comprising:
the device comprises at least two air tanks, namely a first air tank and a second air tank, wherein the first air tank and the second air tank are respectively provided with two air ports, namely a first air port and a second air port;
The passive exhaust device comprises a venturi tube, wherein the venturi tube is provided with an exhaust channel and an air suction channel, the exhaust channel comprises an inlet section, a contraction section and an expansion section, the air suction channel is communicated with the contraction section through a pipeline, a first air port of a first air storage tank is communicated with the air suction channel through a pipeline, and a first air port of a second air storage tank is communicated with the inlet section of the exhaust channel through a pipeline;
One end of the active exhaust device is respectively communicated with the second air ports of the first air storage tank and the second air storage tank through a pipeline, the other end of the active exhaust device is communicated with the inlet section of the exhaust channel through a pipeline, and the active exhaust device can extract the air in the first air storage tank and the second air storage tank and discharge the air from the passive exhaust device in a pressurizing way; the gas in the second gas storage tank is pressurized and discharged from the exhaust channel of the venturi tube through the active exhaust device, and at the moment, the residual gas in the first gas storage tank is adsorbed and discharged from the suction channel of the venturi tube.
In one embodiment of the invention, n air reservoirs are included, wherein:
The first air port of the 1 st air storage tank is communicated with the air suction channel through a pipeline only;
the first air port of the 2~n-1 air storage tank is communicated with the inlet section of the exhaust channel through a pipeline and is also communicated with the air suction channel through a pipeline;
the first air port of the nth air storage tank is communicated with the inlet section of the exhaust passage through a pipeline only;
and the second air ports of all the air storage tanks are communicated with the active exhaust device through pipelines.
In one embodiment of the present invention, the number of the air tanks is 3 to 5.
In one embodiment of the present invention, the passive exhaust apparatus further includes:
a housing within which the venturi is disposed;
the first one-way air inlet valve assembly is arranged in the shell and is communicated with the inlet section of the exhaust channel through a pipeline, and the first one-way air inlet valve assembly controls air to enter from the inlet section only;
The second one-way air inlet valve assembly is arranged in the shell and is communicated with the inlet section of the air suction channel through a pipeline, and the second one-way air inlet valve assembly controls air to enter from the air suction channel only.
In one embodiment of the present invention, the first and second one-way intake valve assemblies each comprise:
the valve plug and the elastic piece are used for elastically supporting the valve plug to seal the air inlet;
when the gas flows from the valve plug to the elastic piece, the gas pushes the valve plug to compress the elastic piece, the valve plug is separated from the gas inlet, the gas inlet is opened, and the gas passes through;
when gas flows from the elastic piece to the valve plug, the gas pushes the valve plug to seal the gas inlet.
In one embodiment of the invention, an on-off check cut-off valve is provided on the line between the first port of the air reservoir and the passive exhaust.
In one embodiment of the invention, an electromagnetic switch valve is arranged on a pipeline between the second air port of the air storage tank and the active exhaust device.
In one embodiment of the invention, a first one-way valve is provided on the line of the active exhaust and the inlet section of the exhaust channel.
In one embodiment of the invention, the gas storage device further comprises an accumulator which is communicated with the expanding section of the exhaust passage through a pipeline, and the gas in the gas storage tank is discharged into the accumulator.
In one embodiment of the invention, the pressure accumulator is provided with a pressure discharge port which is communicated with the air storage tank through a pipeline, and a second one-way valve is arranged on the pipeline between the pressure discharge port and the air storage tank.
In one embodiment of the invention, the system further comprises a plurality of pressure sensors for detecting the gas pressure in the plurality of gas tanks and the accumulator, respectively.
In one embodiment of the invention, the liquefied natural gas or hydrogen is stored in the gas storage tank.
In order to solve the technical problems, the invention also provides a gas storage tank exhaust control method, which is applied to the gas storage tank exhaust control system and comprises the following steps:
S1, determining the number of the gas storage tanks, starting the first gas storage tank, enabling gas in the first gas storage tank to enter from a gas suction channel of a venturi tube, discharging the gas in the first gas storage tank into an accumulator, stopping a gas discharging process when the gas pressure in the first gas storage tank is the same as the gas pressure in the accumulator, and enabling certain gas to remain in the first gas storage tank;
S2, opening the second gas storage tank to enable gas in the second gas storage tank to enter from a gas exhaust channel of the venturi tube, discharging the gas in the second gas storage tank into the pressure accumulator, increasing the flow speed and reducing the pressure of the gas in the second gas storage tank when the gas passes through a constriction section in the venturi tube, and at the moment, absorbing the residual gas in the first gas storage tank and discharging the residual gas into the pressure accumulator from a gas suction channel of the venturi tube;
S3, referring to the step S2, sequentially starting the subsequent gas storage tanks, enabling the gas in the subsequent gas storage tank to enter from an exhaust channel of the venturi tube, enabling the residual gas in the previous gas storage tank to be absorbed and enter from an air suction channel of the venturi tube, and discharging the gas in the two gas storage tanks into an accumulator together;
S4, starting an active exhaust device, pressurizing gas in the last gas storage tank and entering the gas storage tank from an exhaust channel of the venturi tube, wherein residual gas in the last gas storage tank is absorbed and entering the gas storage tank from an air suction channel of the venturi tube, and the gas in the two gas storage tanks are discharged into an accumulator together;
s5, referring to the step S4, pressurizing the gas in the previous gas storage tank from the exhaust channel of the venturi tube in sequence until pressurizing the gas in the first gas storage tank from the exhaust channel of the venturi tube, so that all the gas in all the gas storage tanks are discharged into the pressure accumulator
In one embodiment of the invention, the method further comprises the steps of S6, setting a pressure threshold value in the accumulator, detecting the actual pressure value of the gas in each gas storage tank and the accumulator in real time, discharging the gas in the accumulator into the gas storage tanks with lower pressure of 1-2 gas storage tanks which are being discharged when the actual pressure value in the accumulator exceeds the pressure threshold value, and stopping discharging the gas into the accumulator.
Compared with the prior art, the technical scheme of the invention has the following advantages:
According to the gas storage tank exhaust control system and the gas storage control method, the gas suction characteristics of the venturi tube are utilized to realize efficient exhaust control of a plurality of gas storage tanks, the gas storage tanks are respectively communicated with the exhaust channel and the gas suction channel of the venturi tube, gas in the previous gas storage tank is normally discharged through the venturi tube, when the gas pressure in the gas storage tank is equal to or lower than the use pressure, certain gas remains in the gas storage tank, at the moment, the gas in the next gas storage tank is started to enter through the exhaust channel of the venturi tube, when the gas in the next gas storage tank passes through the contraction section in the venturi tube, the flow speed is increased, the pressure is reduced, at the moment, the residual gas in the previous gas storage tank is adsorbed from the gas suction channel of the venturi tube to be discharged into the effect of secondary discharge, at the moment, the purpose of passive gas discharge can be achieved, and no energy source is consumed;
After all the gases in the plurality of gas storage tanks enter from the exhaust channel of the venturi tube, only the gas in the last gas storage tank is the most, the gases in the other gas storage tanks are partially or completely adsorbed and discharged, finally, the gas in the last gas storage tank is pressurized and discharged from the exhaust channel of the venturi tube through the active exhaust device, at the moment, the residual gas in the previous gas storage tank is adsorbed and discharged from the air suction channel of the venturi tube, the adsorption effect of the secondary venturi tube is realized, the effect of three times of discharge is achieved, and the gas in all the gas storage tanks is pressurized and discharged from the exhaust channel of the venturi tube in sequence, so that the effect of four times of discharge is achieved, thereby improving the exhaust rate and completely discharging the gases in the plurality of gas storage tanks;
Compared with the prior art that all the gas in all the gas storage tanks are discharged by the active exhaust device, only the rest all the gas in the last gas storage tank is actively pressurized and discharged, and the gas in other gas storage tanks can be partially or completely passively discharged, so that energy is not consumed, and the energy consumption is reduced on the premise of meeting the requirement of completely discharging the gas. And when the pressure in the accumulator in front of the engine is too high, the redundant pressure can avoid discharging the air to pollute the environment, and the redundant pressure is directly discharged into the air storage tank to be convenient for recycling.
Drawings
In order that the invention may be more readily understood, a more particular description of the invention will be rendered by reference to specific embodiments thereof which are illustrated in the appended drawings, in which:
FIG. 1 is a schematic diagram of an embodiment of an air reservoir exhaust control system of the present invention;
FIG. 2 is a schematic view of the internal structure of the passive exhaust device of the present invention;
FIG. 3 is a flow chart of the steps of the method for controlling the exhaust of the air storage tank according to the present invention.
The specification reference numerals show that the gas tanks 1,2, 3, 4, a passive exhaust device, 41, a venturi tube, 42, a shell, 43, a first one-way gas inlet valve assembly, 44, a second one-way gas inlet valve assembly, 401, a valve plug, 402, an elastic piece, 5, an active exhaust device, 6, an accumulator, 7, a first switch check cut-off valve, 8, a second switch check cut-off valve, 9, a third switch check cut-off valve, 10, a fourth switch check cut-off valve, 11, a fifth switch check cut-off valve, 12, a first electromagnetic switch valve, 13, a second electromagnetic switch valve, 14, a third electromagnetic switch valve, 15, a first one-way valve, 16, a second one-way valve, 17, a first pressure sensor, 18, a second pressure sensor, 19, a third pressure sensor and 20, and a fourth pressure sensor.
Detailed Description
The present invention will be further described with reference to the accompanying drawings and specific examples, which are not intended to be limiting, so that those skilled in the art will better understand the invention and practice it.
Example 1
The invention discloses an air storage tank exhaust control system which comprises a plurality of air storage tanks, a passive exhaust device and an active exhaust device, and specifically at least comprises two air storage tanks, namely a first air storage tank and a second air storage tank, wherein the first air storage tank and the second air storage tank are respectively provided with two air ports, namely a first air port and a second air port;
The passive exhaust device comprises a venturi tube, wherein the venturi tube is provided with an exhaust passage and an air suction passage, the exhaust passage comprises an inlet section, a contraction section and an expansion section, the air suction passage is communicated with the contraction section through a pipeline, the venturi tube has the functions that when fluid (liquid or gas) passes through a narrowed passage, the flow speed is increased, the pressure is reduced, suction force can be generated at the suction end through the pressure reduction, other fluids are sucked or mixed, the first air port of the first air storage tank is communicated with the air suction passage through a pipeline by utilizing the characteristic, and the first air port of the second air storage tank is communicated with the inlet section of the exhaust passage through a pipeline;
One end of the active exhaust device is respectively communicated with the first air storage tank and the second air storage tank through pipelines, the other end of the active exhaust device is communicated with the inlet section of the exhaust channel through pipelines, and the active exhaust device can extract gas in the first air storage tank and the second air storage tank and discharge the gas from the passive exhaust device under pressure.
Specifically, when a plurality of air tanks are provided, the principle is followed as well, two adjacent air tanks are the first air tank and the second air tank, namely when 3 air tanks are provided, the 2 nd air tank is the second air tank of the 1 st air tank, and the 2 nd air tank is the first air tank of the 3 rd air tank, and so on, and the following is not illustrated, when n air tanks are provided, wherein:
The first air port of the 1 st air storage tank is communicated with the air suction channel through a pipeline only;
the first air port of the 2~n-1 air storage tank is communicated with the inlet section of the exhaust channel through a pipeline and is also communicated with the air suction channel through a pipeline;
the first air port of the nth air storage tank is communicated with the inlet section of the exhaust passage through a pipeline only;
and the second air ports of all the air storage tanks are communicated with the active exhaust device through pipelines.
According to the gas storage tank exhaust control system, the gas suction characteristics of the venturi tube are utilized to realize efficient exhaust control of a plurality of gas storage tanks, the gas storage tanks are respectively communicated with the exhaust channel and the gas suction channel of the venturi tube, gas in the previous gas storage tank is normally discharged through the venturi tube, when the gas pressure in the gas storage tank is equal to or lower than the use pressure, certain gas remains in the gas storage tank, at the moment, the gas in the next gas storage tank is started to enter through the exhaust channel of the venturi tube, when the gas in the next gas storage tank passes through the contraction section in the venturi tube, the flow speed is increased, the pressure is reduced, at the moment, the residual gas in the previous gas storage tank is adsorbed from the gas suction channel of the venturi tube to be discharged into the effect of secondary discharge, at the moment, the purpose of passive gas discharge can be achieved, and no energy consumption is caused;
After all the gases in the plurality of gas storage tanks enter from the exhaust channel of the venturi tube, only the gas in the last gas storage tank is the most, the gases in the other gas storage tanks are partially or completely adsorbed and discharged, finally, the gas in the last gas storage tank is pressurized and discharged from the exhaust channel of the venturi tube through the active exhaust device, at the moment, the residual gas in the previous gas storage tank is adsorbed and discharged from the air suction channel of the venturi tube, the adsorption effect of the secondary venturi tube is realized, the effect of three times of discharge is achieved, and the gas in all the gas storage tanks is pressurized and discharged from the exhaust channel of the venturi tube in sequence, so that the effect of four times of discharge is achieved, thereby improving the exhaust rate and completely discharging the gases in the plurality of gas storage tanks;
Compared with the prior art that all the gas in all the gas storage tanks are discharged by the active exhaust device, only the rest all the gas in the last gas storage tank is actively pressurized and discharged, and the gas in other gas storage tanks can be partially or completely passively discharged, so that energy is not consumed, and the energy consumption is reduced on the premise of meeting the requirement of completely discharging the gas.
Referring to fig. 1, a gas tank exhaust control system including three gas tanks will be described below as an example.
As shown in the drawing, in the present embodiment, three air tanks are provided, no.1 air tank 1, no. 2 air tank 2 and No. 3 air tank 3, respectively, wherein:
The first air port of the No. 1 air storage tank 1 is communicated with an air inlet channel of a venturi tube 41 in the passive exhaust device 4 through a pipeline, and the second air port of the No. 1 air storage tank 1 is communicated with the active exhaust device 5 through a pipeline;
The first air port of the No. 2 air storage tank 2 is respectively communicated with an air inlet channel and an air outlet channel of a venturi tube 41 in the passive air outlet device 4 through pipelines, and the second air port of the No. 2 air storage tank 2 is communicated with the active air outlet device 5 through pipelines;
The first air port of the No. 3 air storage tank 3 is communicated with an exhaust channel of a venturi tube 41 in the passive exhaust device 4 through a pipeline, and the second air port of the No. 3 air storage tank 3 is communicated with the active exhaust device 5;
The active exhaust device 5 is in communication with the exhaust passage of the venturi 41 in the passive exhaust device 4 via a pipe.
Adopt above-mentioned gas holder exhaust control system, the purpose is with the gas in No.1 gas holder 1, no. 2 gas holder 2 and No. 3 gas holder 3 in the accumulator 6, supply the engine to use, consequently, set up accumulator 6 with exhaust passage's expansion section passes through the pipeline intercommunication, makes the gas in the gas holder is discharged in the accumulator 6, and specific exhaust process is:
Firstly, starting a No. 1 gas storage tank 1, allowing gas in the No. 1 gas storage tank 1 to enter from an air suction channel of a venturi tube 41, discharging the gas in the No. 1 gas storage tank 1 into an accumulator 6, stopping the air discharge process when the gas pressure in the No. 1 gas storage tank 1 is the same as the gas pressure in the accumulator 6, and leaving a certain amount of gas in the No. 1 gas storage tank 1;
The gas in the gas storage tank 2 No. 2 is discharged into the pressure accumulator 6 from the exhaust passage of the venturi tube 41 by opening the gas storage tank 2 No. 2, when the gas in the gas storage tank 2 passes through the constriction section of the venturi tube 41, the flow speed is increased, the pressure is reduced, a venturi effect is generated at the moment, residual gas in the gas storage tank 1 No. 1 is adsorbed from the suction passage of the venturi tube 41 and discharged into the pressure accumulator 6 again, and the residual gas in the gas storage tank 1 No. 1 is less;
When the gas pressure in the No. 2 gas tank 2 is the same as the gas pressure in the accumulator 6, stopping the gas discharging process, starting the No. 3 gas tank 3 again, enabling the gas in the No. 3 gas tank 3 to enter from the gas discharging channel of the venturi tube 41, discharging the gas in the No. 3 gas tank 3 into the accumulator 6, when the gas in the No. 3 gas tank 3 passes through the constriction section in the venturi tube 41, increasing the flow speed and reducing the pressure, generating a venturi effect at the moment, enabling the residual gas in the No. 1 gas tank 1 and the residual gas in the No. 2 gas tank 2 to be absorbed together and discharged into the accumulator 6 again from the gas sucking channel of the venturi tube 41, and enabling the residual gas in the No. 1 gas tank 1 and the No. 2 gas tank 2 to be less;
Finally, when the gas pressure in the No. 3 gas tank 3 is the same as the gas pressure in the accumulator 6, the gas in the No. 3 gas tank 3 is stopped in the process of exhausting, the active exhaust device 5 is started, the gas in the No. 3 gas tank 3 is firstly introduced from the exhaust channel of the venturi tube 41, when the gas in the No. 3 gas tank 3 passes through the constriction section of the venturi tube 41, the flow rate is increased, the pressure is reduced, a secondary venturi effect is generated at the moment, the residual gas in the No. 1 gas tank 1 and the residual gas in the No. 2 gas tank 2 are adsorbed together and are exhausted into the accumulator 6 from the air suction channel of the venturi tube 41 again, the residual gas in the No. 1 gas tank 1 and the No. 2 gas tank 2 are less, after all the gas in the No. 3 gas tank 3 is exhausted, if the gas in the No. 2 gas tank 2 is still present, the active exhaust device 5 is started again, the gas in the No. 2 gas tank 2 is introduced from the exhaust channel of the venturi tube 41, when the gas in the No. 2 gas in the venturi tube 41 passes through the constriction section of the venturi tube 41, the pressure is increased, the pressure is reduced, the secondary venturi effect is generated, the residual gas in the No. 1 gas tank 1 is adsorbed by the residual gas in the No. 1 gas tank 1 and the No. 2 gas is exhausted from the air suction channel of the No. 1 gas tank 1 from the accumulator 1 and the gas tank 2, and the gas in the air tank 1 is exhausted from the active exhaust device 1 and the air 1 and the active exhaust device 1 is completely after all the gas is exhausted from the gas in the air tank 1 and 1.
Specifically, according to practical experiments, when three air tanks are arranged, after the air in the air tank 3 is exhausted through the active exhaust device 5, the air in the air tank 1 is basically and completely exhausted, so when the air tank exhaust control system is adopted, when three or more air tanks are arranged, the exhaust efficiency is maximized, in theory, the more the air tanks are arranged, the higher the efficiency is, but according to practical use requirements, 3-5 air tanks are arranged in a general vehicle-mounted engine to be optimally configured according to application scenes and occupied space distribution, and the maximum efficiency can be achieved and the practical arrangement condition is satisfied.
In this embodiment, an air tank exhaust control system formed by three air tanks is provided, so that, for convenience in subsequent expansion, the first air port of the air tank 3 is also communicated with the air inlet channel of the venturi 41 in the passive air exhaust device 4 through a pipeline, so as to facilitate the subsequent increase in the number of air tanks.
Specifically, in order to realize the communication control between different air tanks and the venturi tube 41, an on-off check cut-off valve is arranged on a pipeline between the first air port of the air tank and the passive air exhaust device 4;
Referring to fig. 1, in the present embodiment, a first on-off check valve 7 is disposed on a line between the first air port of the No. 1 air tank 1 and the air intake channel of the venturi tube 41, a second on-off check valve 8 is disposed on a line between the first air port of the No. 2 air tank 2 and the air intake channel of the venturi tube 41, a third on-off check valve 9 is disposed on a line between the first air port of the No. 2 air tank 2 and the air exhaust channel of the venturi tube 41, a fourth on-off check valve 10 is disposed on a line between the first air port of the No. 3 air tank 3 and the air intake channel of the venturi tube 41, and a fifth on-off check valve 11 is disposed on a line between the first air port of the No. 3 air tank 3 and the air exhaust channel of the venturi tube 41.
Specifically, an electromagnetic switch valve is arranged on a pipeline between the second air port of the air storage tank and the active exhaust device 5;
Referring to fig. 1, in this embodiment, a first electromagnetic switch valve 12 is disposed on a pipeline between the second air port of the No. 1 air tank 1 and the active exhaust device 5, a second electromagnetic switch valve 13 is disposed on a pipeline between the second air port of the No. 2 air tank 2 and the active exhaust device 5, and a third electromagnetic switch valve 14 is disposed on a pipeline between the second air port of the No. 3 air tank 3 and the active exhaust device 5, and in actual use, the communication modes between different air tanks and the active exhaust device 5 can be controlled by controlling the switch of the first electromagnetic switch valve 12, the second electromagnetic switch valve 13 and the third electromagnetic switch valve 14.
Specifically, referring to fig. 1, a first check valve 15 is disposed on the pipe lines of the inlet sections of the active exhaust device 5 and the exhaust channel, so that the gas can flow only in one direction through the active exhaust device 5, that is, the gas can be discharged from the gas storage tank to the venturi 41 in the passive exhaust device 4 under pressure, and finally discharged to the accumulator 6, so as to prevent the gas from flowing reversely.
Specifically, in the exhaust control system of the air storage tank, in the process of actual use, there may be a situation that the engine is not used for a long time, and when the air in the accumulator 6 is full, the accumulator 6 will start a self-protection mode, and the redundant air is discharged to the outside of the accumulator 6, so that environmental pollution and energy waste are caused, and in order to solve the problem, the invention adopts two technical means:
The first pressure accumulator 6 is provided with a pressure discharge port which is communicated with the air storage tank through a pipeline, when the air in the pressure accumulator 6 is fully stored or reaches a set threshold value, the air in the pressure accumulator 6 can be recovered into the air storage tank to avoid environmental pollution and energy waste caused by discharge, and a second one-way valve 16 is arranged on the pipeline between the pressure discharge port and the air storage tank, so that the air can only flow from the pressure accumulator 6 to the air storage tank through the second one-way valve 16.
Second, a plurality of pressure sensors are provided, the plurality of pressure sensors are respectively used for detecting the gas pressure in the plurality of gas tanks and the pressure accumulator 6, referring to fig. 1, a first pressure sensor 17, a second pressure sensor 18 and a third pressure sensor 19 are respectively provided corresponding to the number 1 gas tank 1, the number 2 gas tank 2 and the number 3 gas tank 3, a fourth pressure sensor 20 is provided corresponding to the pressure accumulator 6, the gas pressure in the pressure accumulator 6 is detected by the fourth pressure sensor 20, when the gas pressure reaches a set threshold value, the gas discharge into the pressure accumulator 6 is stopped, and when the gas discharge is not timely stopped or the pressure in the pressure accumulator 6 exceeds the set threshold value, the pressure accumulator 6 is discharged into the gas tank with the minimum pressure.
Specifically, according to actual use requirements, liquefied natural gas, hydrogen or other combustible gases are stored in the gas storage tank.
Specifically, when the venturi tube 41 is used, the unidirectional flow of the air flow needs to be ensured, namely, when the air flow enters from the exhaust channel of the venturi tube 41, the air flow can only flow along the direction from the inlet section to the expansion section, and when the air flow enters from the suction channel of the venturi tube 41, the air flow can only be discharged from the expansion section;
In order to realize the above-mentioned unidirectional flow, referring to fig. 2, the passive exhaust apparatus 4 of the present invention further comprises a housing 42, a first unidirectional air intake valve assembly 43 and a second unidirectional air intake valve assembly 44, wherein the venturi tube 41, the first unidirectional air intake valve assembly 43 and the second unidirectional air intake valve assembly 44 are all arranged in the housing 42, the first unidirectional air intake valve assembly 43 is communicated with an inlet section of the exhaust channel through a pipeline, the first unidirectional air intake valve assembly 43 controls the air to enter from the inlet section only, the second unidirectional air intake valve assembly 44 is communicated with an inlet section of the intake channel through a pipeline, and the second unidirectional air intake valve assembly 44 controls the air to enter from the intake channel only.
In this embodiment, the first unidirectional air intake valve assembly 43 and the second unidirectional air intake valve assembly 44 have similar structures, and the first unidirectional air intake valve assembly 43 and the second unidirectional air intake valve assembly 44 each comprise a valve plug 401 and an elastic member 402, wherein the elastic member 402 elastically supports the valve plug 401 to block an air inlet;
When gas flows from the valve plug 401 to the elastic piece 402, the gas pushes the valve plug 401 to compress the elastic piece 402, the valve plug 401 is separated from the gas inlet, the gas inlet is opened, and the gas passes through;
when gas flows from the elastic member 402 toward the valve plug 401, the gas pushes the valve plug 401 to block the gas inlet.
Example 2
By applying the air storage tank exhaust control system, referring to fig. 3, the invention also discloses an air storage tank exhaust control method, which comprises the following steps:
S1, determining the number of the gas storage tanks, starting the first gas storage tank, enabling gas in the first gas storage tank to enter from a gas suction channel of a venturi tube, discharging the gas in the first gas storage tank into an accumulator, stopping a gas discharging process when the gas pressure in the first gas storage tank is the same as the gas pressure in the accumulator, and enabling certain gas to remain in the first gas storage tank;
S2, opening the second gas storage tank to enable gas in the second gas storage tank to enter from a gas exhaust channel of the venturi tube, discharging the gas in the second gas storage tank into the pressure accumulator, increasing the flow speed and reducing the pressure of the gas in the second gas storage tank when the gas passes through a constriction section in the venturi tube, and at the moment, absorbing the residual gas in the first gas storage tank and discharging the residual gas into the pressure accumulator from a gas suction channel of the venturi tube;
S3, referring to the step S2, sequentially starting the subsequent gas storage tanks, enabling the gas in the subsequent gas storage tank to enter from an exhaust channel of the venturi tube, enabling the residual gas in the previous gas storage tank to be absorbed and enter from an air suction channel of the venturi tube, and discharging the gas in the two gas storage tanks into an accumulator together;
S4, starting an active exhaust device, pressurizing gas in the last gas storage tank and entering the gas storage tank from an exhaust channel of the venturi tube, wherein residual gas in the last gas storage tank is absorbed and entering the gas storage tank from an air suction channel of the venturi tube, and the gas in the two gas storage tanks are discharged into an accumulator together;
S5, referring to the step S4, pressurizing the gas in the previous gas storage tank from the exhaust channel of the venturi tube until pressurizing the gas in the first gas storage tank from the exhaust channel of the venturi tube, and discharging all the gas in all the gas storage tanks into the pressure accumulator.
The specific implementation steps of the gas storage tank exhaust control method of the present invention are illustrated in embodiment 1, and the detailed description is omitted herein, and compared with the exhaust mode of exhausting all the gas in all the gas storage tanks by using the active exhaust device in the prior art, the method of the present invention only needs to actively pressurize and exhaust all the remaining gas in the last gas storage tank, and the gas in other gas storage tanks can be partially or completely passively exhausted without consuming energy, so that the energy consumption is reduced on the premise of meeting the total exhaust of the gas.
S6, setting a pressure threshold value in the accumulator, detecting actual pressure values of the gas in each gas tank and the accumulator in real time, discharging the gas in the accumulator into the gas tanks with lower pressure in the process of discharging gas when the actual pressure values in the accumulator exceed the pressure threshold value, and stopping discharging gas into the accumulator, so that the accumulator can be prevented from being discharged due to the fact that the pressure of the gas in the accumulator is too high, and energy waste is prevented.
It is apparent that the above examples are given by way of illustration only and are not limiting of the embodiments. Other variations and modifications of the present invention will be apparent to those of ordinary skill in the art in light of the foregoing description. It is not necessary here nor is it exhaustive of all embodiments. While still being apparent from variations or modifications that may be made by those skilled in the art are within the scope of the invention.
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| CN119934412B (en) * | 2024-12-31 | 2025-09-30 | 广州市华达石化有限公司 | Exhaust emptying control system, method and device for liquid carbon dioxide storage tank |
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